Carrier Heating System 48PG20 28 User Manual
48PG20-28  
Single Package Rooftop Units  
Electric Cooling/Gas Heating with  
Electromechanical Controls and PURON® (R-410A) Refrigerant  
Installation, Start-Up and Service Instructions  
Page  
CONTENTS  
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57-61  
Unit Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
EconoMi$er IV Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . 60  
Phase Loss Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17  
Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . .2  
•
•
•
ROOF CURB  
ALTERNATE UNIT SUPPORT  
SLAB MOUNT  
UNIT START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1  
Step 2 — Remove Shipping Rails . . . . . . . . . . . . . . . . . . . . . . .2  
Step 3 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
SAFETY CONSIDERATIONS  
•
•
•
POSITIONING  
Installation and servicing of air-conditioning equipment can  
be hazardous due to system pressure and electrical compo-  
nents. Only trained and qualified service personnel should  
install, repair, or service air-conditioning equipment.  
Untrained personnel can perform the basic maintenance  
functions of cleaning coils and filters and replacing filters. All  
other operations should be performed by trained service per-  
sonnel. When working on air-conditioning equipment, observe  
precautions in the literature, tags and labels attached to the unit,  
and other safety precautions that may apply.  
ROOF MOUNT  
INSTALLATION ONTO CURB  
Step 4 — Field Fabricate Ductwork . . . . . . . . . . . . . . . . . . . . .9  
Step 5 — Make Unit Duct Connections. . . . . . . . . . . . . . . . . .9  
•
•
VERTICAL CONFIGURATION  
HORIZONTAL APPLICATIONS  
Step 6 — Install Flue Hood and Inlet Hood . . . . . . . . . . . . 10  
Step 7 — Trap Condensate Drain . . . . . . . . . . . . . . . . . . . . . 10  
Step 8 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Step 9 — Make Electrical Connections. . . . . . . . . . . . . . . . .11  
•
•
FIELD POWER SUPPLY  
FIELD CONTROL WIRING  
Follow all safety codes. Wear safety glasses and work  
gloves. Use quenching cloth for unbrazing operations. Have  
fire extinguishers available for all brazing operations.  
Step 10 — Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . . . 12  
•
MANUAL DAMPER ASSEMBLY  
Step 11 — Position Optional Power  
Exhaust or Barometric Relief Damper Hood . . . . . . . . . 16  
Step 12 — Non-Fused Disconnect . . . . . . . . . . . . . . . . . . . . 16  
Step 13 — Install All Accessories. . . . . . . . . . . . . . . . . . . . . 16  
Before performing service or maintenance operations on  
unit, turn off main power switch to unit. Electrical shock  
could cause personal injury.  
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-45  
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Compressor Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Crankcase Heater(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Compressor Rotation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Subcooler Heat Exchanger (SHX). . . . . . . . . . . . . . . . . . . . . 18  
Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Condenser Fans and Motors. . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Outdoor-Air Inlet Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Optional EconoMi$er IV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44  
Puron (R-410A) refrigerant systems operate at higher pres-  
sures than standard R-22 systems. Do not use R-22 service  
equipment or components on Puron refrigerant equipment.  
If service equipment is not rated for Puron refrigerant,  
equipment damage or personal injury may result.  
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46-57  
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46  
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47  
Manual Outdoor Air Damper . . . . . . . . . . . . . . . . . . . . . . . . . . 48  
Economizer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48  
Evaporator Fan Service and Replacement . . . . . . . . . . . . 48  
Evaporator Fan Performance Adjustment. . . . . . . . . . . . . 48  
Evaporator Fan Belt Tension Adjustment . . . . . . . . . . . . . 48  
Condenser Fan Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Verify Sensor Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Economizer Operation During Power Failure. . . . . . . . . . 49  
Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
Gas Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50  
High Altitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
1. Improper installation, adjustment, alteration, service,  
or maintenance can cause property damage, personal  
injury, or loss of life. Refer to the User’s Information  
Manual provided with this unit for more details.  
2. Do not store or use gasoline or other flammable  
vapors and liquids in the vicinity of this or any other  
appliance.  
What to do if you smell gas:  
1. DO NOT try to light any appliance.  
2. DO NOT touch any electrical switch, or use any  
phone in your building.  
3. IMMEDIATELY call your gas supplier from a neigh-  
bor’s phone. Follow the gas supplier’s instructions.  
4. If you cannot reach your gas supplier, call the fire  
department.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 111 Catalog No. 534-80211 Printed in U.S.A. Form 48PG-10SI Pg 1 9-05 Replaces: New  
Book 1  
4
Tab 1a 6a  
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SHIPPING RAILS  
Fig. 2 — Shipping Rail Removal  
MAX  
WEIGHT  
(LB) *  
CENTER OF GRAVITY ( IN.)  
UNIT SIZE  
Z
Y
X
3825  
4075  
4300  
PG20  
PG24  
PG28  
66.5  
36.7  
31.4  
66.5  
70.5  
37.0  
37.0  
31.8  
35.2  
DOES NOT INCLUDE ERV ( ENERGY RECOVERY VENTILATOR) OPTION.  
NOTES:  
1. Add 150 lb (68 kg) for domestic crating.  
2. See label for unit location on roof curb.  
Fig. 3 — Rigging Details  
4
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Table 1 — Physical Data  
UNIT 48PG  
20  
24  
28  
VOLTAGE  
NOMINAL CAPACITY (Tons)  
208/230 and 460  
18  
575  
18  
208/230 and 460  
20  
575  
20  
208/230 and 460  
25  
575  
25  
OPERATING WEIGHT (lb)  
48 Series (Low Heat) Al/Al*  
2480  
2480  
2588  
2588  
2773  
2773  
COMPRESSOR  
Fully Hermetic Scroll  
Quantity  
2
2
2
2
2
2
2
3
2
3
2
Number of Refrigerant Circuits  
Oil (ounces) Comp A1, A2, B1  
2
85, NA, 85  
85, NA, 85  
85, NA, 85  
85, NA, 85  
85, 85, 85  
85, 85, 85  
REFRIGERANT TYPE  
Expansion Device  
Change Type  
Puron® Refrigerant (R-410A)  
TXV  
TXV  
TXV  
TXV  
TXV  
TXV  
Operating Charge (lb)  
Circuit A  
25.3  
25.3  
25.3  
25.3  
35.7  
33.5  
35.7  
33.5  
49.3  
24.3  
49.3  
24.3  
Circuit B  
REFRIGERANT SUBCOOLER  
Heat Exchanger Size  
Expansion Device  
B15Hx26x26  
TXV  
B15Hx26x26  
TXV  
B15Hx26x26  
TXV  
B15Hx26x26  
TXV  
B15Hx26x36  
TXV  
B15Hx26x36  
TXV  
CONDENSER COIL  
Rows...Fins/inch  
Quantity  
Enhanced Copper Tubes, Aluminum Lanced Fins  
2...17  
2
2...17  
2
3...17  
3
3...17  
3
3...17  
3
3...17  
3
Length of Tube Sheets (in.)  
Width (in.)  
80.3  
60  
80.3  
60  
80.3  
60  
80.3  
60  
33.46  
80.3  
60  
80.3  
60  
Total Face area (sq. ft)  
33.46  
33.46  
33.46  
33.46  
33.46  
CONDENSER FAN  
Propeller  
Nominal Cfm (Total, all fans)  
Quantity...Diameter (in.)  
Motor Hp...Rpm  
14,000  
4...22  
14,000  
4...22  
21,000  
6...22  
21,000  
6...22  
21,000  
6...22  
21,000  
6...22  
1/4...1100  
1400  
1/4...1100  
1400  
1/4...1100  
2100  
1/4...1100  
2100  
1/4...1100  
2100  
1/4...1100  
2100  
Watts input (Total)  
EVAPORATOR COIL  
Rows...Fins/inch  
Enhanced Copper Tubes, Face Split, Aluminum Double-Wavy Fins  
4...15  
69.4  
48  
4...15  
69.4  
48  
4...15  
69.4  
48  
4...15  
69.4  
48  
4...15  
69.4  
60  
4...15  
69.4  
60  
Length of Tube Sheets (in.)  
Width (in.)  
Total Face area (sq ft)  
23.13  
23.13  
23.13  
23.13  
28.92  
28.92  
EVAPORATOR FAN  
Quantity...Size (in.)  
Type Drive  
Centrifugal, Belt Type  
2...15 x 11  
Belt  
2...15 x 11  
Belt  
2...15 x 11  
Belt  
2...15 x 11  
Belt  
2...15 x 11  
Belt  
2...15 x 11  
Belt  
Nominal Cfm  
7000  
7000  
8000  
8000  
Ball  
10,000  
Ball  
10,000  
Ball  
Motor Bearing Type  
Maximum Allowable Fan Rpm  
Ball  
1400  
Ball  
1400  
Ball  
1400  
1400  
1400  
1400  
FURNACE SECTION  
Rollout Switch Cutout Temp (F)  
Burner Orifice Diameter (in. ...drill size)  
Gas  
Vertical  
225  
225  
225  
225  
225  
225  
0.136...29  
Natural  
0.136...29  
Natural  
0.136...29  
Natural  
0.136...29  
Natural  
0.136...29  
Natural  
0.136...29  
Natural  
Thermostat Heat Anticipator Setting  
Stage 1 (amps)  
0.98  
0.44  
317,000  
400,000  
82  
25-55  
281,000  
365,000  
81  
0.98  
0.44  
317,000  
400,000  
82  
25-55  
281,000  
365,000  
81  
0.98  
0.44  
317,000  
400,000  
82  
25-55  
281,000  
365,000  
81  
0.98  
0.44  
317,000  
400,000  
82  
25-55  
281,000  
365,000  
81  
0.98  
0.44  
317,000  
400,000  
82  
25-55  
281,000  
365,000  
81  
0.98  
0.44  
317,000  
400,000  
82  
25-55  
281,000  
365,000  
81  
Stage 2 (amps)  
Gas Input (Btuh) HIGH HEAT  
Stage 1  
Stage 2  
Vertical  
Efficiency (Steady State) %  
Temperature Rise Range  
Gas Input (Btuh) MEDIUM HEAT  
Stage 1  
Stage 2  
Vertical  
Efficiency (Steady State) %  
Temperature Rise Range  
Gas Input (Btuh) LOW HEAT  
25-55  
199,000  
250,000  
82  
25-55  
199,000  
250,000  
82  
25-55  
199,000  
250,000  
82  
25-55  
199,000  
250,000  
82  
25-55  
199,000  
250,000  
82  
25-55  
199,000  
250,000  
82  
Stage 1  
Stage 2  
Vertical  
Efficiency (Steady State) %  
Temperature Rise Range  
Manifold Pressure  
15-45  
15-45  
15-45  
15-45  
15-45  
15-45  
Natural Gas (in. wg)  
Vertical  
Horizontal  
3.00  
2.95  
3.00  
2.95  
3.00  
2.95  
3.00  
2.95  
3.00  
2.95  
3.00  
2.95  
Natural Gas (in. wg)  
Gas Valve Quantity  
1
1
1
1
1
1
Gas Valve Pressure Range  
Min-Max Allowable  
(in. wg)  
(psig)  
5.5-13.0  
5.5-13.0  
5.5-13.0  
5.5-13.0  
5.5-13.0  
5.5-13.0  
.235-.469  
.235-.469  
.235-.469  
.235-.469  
.235-.469  
.235-.469  
3
3
3
3
3
3
Field Gas Connection Size (in...FPT)  
/
/
/
/
/
/
4
4
4
4
4
4
HIGH-PRESSURE SWITCHES (psig)  
Cutout  
630 10  
505 20  
630 10  
505 20  
630 10  
505 20  
630 10  
505 20  
630 10  
505 20  
630 10  
505 20  
Reset (Auto)  
OUTDOOR AIR INLET SCREENS  
Quantity...Size (in.)  
3...20 x 25  
3...20 x 25  
3...20 x 25  
3...20 x 25  
3...20 x 25  
3...20 x 25  
RETURN-AIR FILTERS  
Quantity...Size (in.)  
9...16 x 25 x 2  
9...16 x 25 x 2  
9...16 x 25 x 2  
9...16 x 25 x 2  
9...20 x 25 x 2  
9...20 x 25 x 2  
LEGEND  
TXV — Thermostatic Expansion Valve  
*Aluminum evaporator coil/aluminum condenser coil.  
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Table 2 — Fan Motor and Drive Data — Vertical Supply/Return  
20  
208/230 and 460  
24  
208/230 and 460  
28  
208/230 and 460  
48PG  
575  
575  
575  
LOW RANGE  
Motor Hp  
3.7  
5
1750  
5.75  
3.7  
5
1750  
5.75  
5
1750  
5.75  
5
1750  
5.75  
Motor Nominal Rpm  
1750  
4.26  
1750  
4.26  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
3174  
56HZ  
4290  
S184T  
11/8  
3174  
56HZ  
4290  
S184T  
11/8  
4290  
S184T  
11/8  
4290  
S184T  
11/8  
7
7
Motor Shaft Diameter (in.)  
/
/
Fan Rpm Range  
685-8939  
751-954  
3.7  
685-8939  
751-954  
3.7  
687-873  
3.7  
687-873  
3.7  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
2.7  
3.7  
2.7  
3.7  
4.7  
4.7  
4.7  
4.7  
6.8  
8.6  
6.8  
8.6  
9.4  
9.4  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
Fixed  
9.81-13.055  
Fixed  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn — Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
11.293-13.544  
11.293-13.544  
1...BX38...39.8 1...BX40...41.8 1...BX38...39.8 1...BX40...41.8 1...BX41...42.8 1...BX41...42.8  
42  
6
812  
34  
6
853  
42  
6
812  
34  
6
853  
31  
6
780  
31  
6
780  
MID-LOW RANGE  
Motor Hp  
5
1750  
5
1750  
5
1750  
5
1750  
5
1750  
5
1750  
Motor Nominal Rpm  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
4290  
4290  
4290  
4290  
4290  
4290  
S184T  
S184T  
S184T  
S184T  
S184T  
S184T  
Motor Shaft Diameter (in.)  
Fan Rpm Range  
11/8  
11/8  
11/8  
11/8  
11/8  
11/8  
949-1206  
3.7  
949-1206  
3.7  
949-1206  
3.7  
949-1206  
3.7  
805-1007  
4.8  
805-1007  
4.8  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
4.7  
4.7  
4.7  
4.7  
6
6
6.8  
6.8  
6.8  
6.8  
10.4  
10.4  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Fixed  
9.81-13.055  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn — Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
1...BX38...39.8 1...BX38...39.8 1...BX38...39.8 1...BX38...39.8 1...BX45...46.8 1...BX45...46.8  
43  
6
1078  
43  
6
1078  
43  
6
1178  
43  
6
1078  
34  
6
906  
34  
6
906  
MID-HIGH RANGE  
Motor Hp  
7.5  
1750  
7.5  
1750  
7.5  
1750  
7.5  
1750  
7.5  
1750  
7.5  
1750  
Motor Nominal Rpm  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
8.63  
8.63  
8.63  
8.63  
8.63  
8.63  
6434  
6434  
6434  
6434  
6434  
6434  
S213T  
S213T  
S213T  
S213T  
S213T  
S213T  
Motor Shaft Diameter (in.)  
Fan Rpm Range  
13/8  
13/8  
13/8  
13/8  
13/8  
13/8  
941-1176  
4.8  
941-1176  
4.8  
941-1176  
4.8  
941-1176  
4.8  
941-1176  
4.8  
941-1176  
4.8  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
6.0  
6.0  
6.0  
6.0  
6.0  
6.0  
8.9  
8.9  
8.9  
8.9  
8.9  
8.9  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn —  
Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8 1...BX42...43.8  
39  
39  
39  
39  
39  
39  
6
6
6
6
6
6
1059  
1059  
1059  
1059  
1059  
1059  
HIGH RANGE  
Motor Hp  
10  
1750  
10  
1750  
10  
1750  
10  
1750  
10  
1750  
10  
1750  
Motor Nominal Rpm  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
11.50  
8579  
11.50  
8579  
11.50  
8579  
11.50  
8579  
11.50  
8579  
11.50  
8579  
S215T  
S215T  
S215T  
S215T  
S215T  
S215T  
Motor Shaft Diameter (in.)  
Fan Rpm Range  
13/8  
13/8  
13/8  
13/8  
13/8  
13/8  
1014-1297  
4.3  
1014-1297  
4.3  
1014-1297  
4.3  
1014-1297  
4.3  
1014-1297  
4.3  
1014-1297  
4.3  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
5.5  
5.5  
5.5  
5.5  
5.5  
5.5  
7.4  
7.4  
7.4  
7.4  
7.4  
7.4  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
Fixed  
9.025-12.179  
2...BX38..39.8  
47  
Fixed  
9.025-12.179  
2...BX38...39.8  
47  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn — Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
2...BX38...39.8 2...BX38...39.8 2...BX38...39.8 2...BX38...39.8  
47  
6
1156  
47  
6
1156  
47  
6
1156  
47  
6
1156  
6
6
1156  
1156  
7
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Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return  
20  
208/230 and 460  
24  
208/230 and 460  
28  
208/230 and 460  
48PG  
575  
575  
575  
LOW RANGE  
Motor Hp  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
5
1750  
5
1750  
Motor Nominal Rpm  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
Motor Shaft Diameter (in.)  
Fan Rpm Range  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn —  
Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
5.75  
5.75  
4290  
4290  
S184T  
S184T  
11/8  
11/8  
687-873  
3.7  
687-873  
3.7  
4.7  
4.7  
9.4  
9.4  
13/16  
13/16  
Fixed  
Fixed  
9.81-13.055  
1...BX41...42.8  
9.81-13.055  
1...BX41...42.8  
—
—
—
—
31  
31  
—
—
—
—
—
—
—
—
6
780  
6
780  
MID-LOW RANGE  
Motor Hp  
3.7  
5
1750  
3.7  
5
1750  
5
1750  
5
1750  
Motor Nominal Rpm  
1750  
4.26  
3174  
1750  
4.26  
3174  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
5.75  
5.75  
5.75  
5.75  
4290  
4290  
4290  
4290  
56HZ  
S184T  
56HZ  
S184T  
S184T  
S184T  
7
7
Motor Shaft Diameter (in.)  
Fan Rpm Range  
/
8
11/8  
/
8
11/8  
11/8  
11/8  
896-1227  
2.7  
873-1108  
3.7  
896-1227  
873-1108  
3.7  
805-1007  
4.8  
805-1007  
4.8  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
2.7  
3.7  
3.7  
4.7  
4.7  
6.0  
6.0  
5.2  
7.4  
5.2  
7.4  
10.4  
10.4  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
Fixed  
Fixed  
Fixed  
Fixed  
Fixed  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn —  
Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
11.293-13.544  
1...BX35...36.8  
9.81-13.055  
1...BX38...39.8  
11.293-13.544  
1...BX35...36.8  
9.81-13.055  
1...BX38...39.8  
9.81-13.055  
1...BX45...46.8  
9.81-13.055  
1...BX45...46.8  
55  
39  
55  
39  
34  
34  
6
6
991  
6
6
991  
6
906  
6
906  
1062  
1062  
MID-HIGH RANGE  
Motor Hp  
5
1750  
5
1750  
5
1750  
5
1750  
7.5  
1750  
7.5  
1750  
Motor Nominal Rpm  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
4290  
4290  
4290  
4290  
6434  
6434  
S184T  
S184T  
S184T  
S184T  
S213T  
S213T  
Motor Shaft Diameter (in.)  
Fan Rpm Range  
11/8  
11/8  
11/8  
11/8  
13/8  
13/8  
1113-1414  
3.7  
1113-1414  
3.7  
1113-1414  
3.7  
1113-1414  
3.7  
941-1176  
4.8  
941-1176  
4.8  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
4.7  
4.7  
4.7  
4.7  
6.0  
6.0  
5.8  
5.8  
5.8  
5.8  
8.9  
8.9  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
Fixed  
Fixed  
Fixed  
Fixed  
Fixed  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn —  
Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
9.81-13.055  
1...BX35...36.8  
9.81-13.055  
1...BX35...36.8  
9.81-13.055  
1...BX35...36.8  
9.81-13.055  
1...BX35...36.8  
9.025-12.179  
1...BX42...43.8  
9.025-12.179  
1...BX42...43.8  
50  
50  
50  
50  
39  
39  
6
6
6
6
6
6
1264  
1264  
1264  
1264  
1059  
1059  
HIGH RANGE  
Motor Hp  
7.5  
1750  
7.5  
1750  
7.5  
1750  
7.5  
1750  
10  
1750  
10  
1750  
Motor Nominal Rpm  
Maximum Continuous Bhp  
Maximum Continuous Watts  
Motor Frame Size  
8.63  
8.63  
8.63  
8.63  
11.50  
11.50  
6434  
6434  
6434  
6434  
8579  
8579  
S213T  
S213T  
S213T  
S213T  
S215T  
S215T  
Motor Shaft Diameter (in.)  
Fan Rpm Range  
13/8  
13/8  
13/8  
13/8  
13/8  
13/8  
1096-1339  
5.4  
1096-1339  
5.4  
1096-1339  
5.4  
1096-1339  
5.4  
1014-1297  
4.3  
1014-1297  
4.3  
Motor Pulley Min. Pitch Diameter (in.)  
Motor Pulley Max. Pitch Diameter (in.)  
Blower Pulley Pitch Diameter (in.)  
Blower Pulley Shaft Diameter (in.)  
Blower Pulley Type  
6.6  
6.6  
6.6  
6.6  
5.5  
5.5  
8.6  
8.6  
8.6  
8.6  
7.4  
7.4  
13/16  
13/16  
13/16  
13/16  
13/16  
13/16  
Fixed  
Fixed  
Fixed  
Fixed  
Fixed  
Fixed  
Pulley Center Line Distance (in.)  
Belt, Quantity...Type...Length (in.)  
Speed Change Per Turn —  
Moveable Pulley (rpm)  
Moveable Pulley Maximum Full Turns  
Factory Speed Setting (rpm)  
9.025-12.179  
1...BX42...43.8  
9.025-12.179  
1...BX42...43.8  
9.025-12.179  
1...BX42...43.8  
9.025-12.179  
1...BX42...43.8  
9.025-12.179  
1...BX38...39.8  
9.025-12.179  
1...BX38...39.8  
41  
41  
41  
41  
47  
47  
6
6
6
6
6
6
1218  
1218  
1218  
1218  
1156  
1156  
8
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ALIGNMENT  
HOLE  
(IN BASE RAIL)  
For vertical supply and return units, tools or parts could  
drop into ductwork and cause an injury. Install a 90 degree  
turn in the return ductwork between the unit and the condi-  
tioned space. If a 90 degree elbow cannot be installed, then  
a grille of sufficient strength and density should be installed  
to prevent objects from falling into the conditioned space.  
ALIGNMENT  
HOLE SHOULD  
LINE UP WITH  
ROOF CURB  
EDGE FLANGE  
EDGE FLANGE  
HORIZONTAL APPLICATIONS — Horizontal units are  
shipped with outer panels that allow for side by side horizontal  
duct connections. If specified during ordering, the unit will be  
shipped with the vertical duct openings blocked off from the  
factory, ready for side supply installation. If the horizontal  
supply/return option was not specified at time of ordering the  
unit, a field-installed accessory kit is required to convert the  
vertical unit into a horizontal supply configuration.  
Fig. 5 — Alignment Hole Details  
Installation of the duct block-off covers should be complet-  
ed prior to placing the unit unless sufficient side clearance is  
available. A minimum of 66 in. is required between the unit  
and any obstruction to install the duct block-off covers. Side  
supply duct dimensions and locations are shown on Fig. 4.  
Install ductwork to horizontal duct flange connections on side  
of unit.  
SUPPLY  
RETURN  
OPENING  
OPENING  
CURB  
RETURN  
OPENING  
CURB  
SUPPLY  
OPENING  
ALIGNMENT  
HOLES FOR  
CURB-BOTH  
SIDES  
ECONOMIZER  
ROOF CURB  
Fig. 6 — Alignment Hole Location  
Step 4 — Field Fabricate Ductwork — On vertical  
units, secure all ducts to roof curb and building structure. Do  
not connect ductwork to unit. For horizontal applications, field-  
supplied flanges should be attached to horizontal discharge  
openings and all ductwork secured to the flanges. Insulate and  
weatherproof all external ductwork, joints, and roof openings  
with counter flashing and mastic in accordance with applicable  
codes.  
HEAT  
EXCHANGER  
SEE  
NOTE  
SEE  
NOTE  
Ducts passing through an unconditioned space must be  
insulated and covered with a vapor barrier.  
AIR  
IN  
AIR  
OUT  
If a plenum return is used on a vertical unit, the return  
should be ducted through the roof deck to comply with applica-  
ble fire codes.  
A minimum clearance is not required around ductwork.  
Cabinet return-air static shall not exceed –0.35 in. wg with  
economizer or 0.45 in. wg without economizer.  
These units are designed for a minimum continuous return-  
air temperature in heating of 50 F (dry bulb), or an intermittent  
operation down to 45 F (dry bulb), such as when used with a  
night set-back thermostat.  
NOTE: Do not drill in this area; damage to basepan may result in  
water leak.  
Fig. 7 — Air Distribution — Vertical Supply/Return  
ECONOMIZER  
To operate at lower return-air temperatures, a field-supplied  
outdoor-air temperature control must be used to initiate both  
stages of heat when the temperature is below 45 F. Indoor com-  
fort may be compromised when these lower air temperatures  
are used with insufficient heating temperature rise.  
HEAT  
Step 5 — Make Unit Duct Connections  
SEE  
SEE  
NOTE  
EXCHANGER  
NOTE  
VERTICAL CONFIGURATION — Unit is shipped for ver-  
tical supply and return duct connections. Ductwork openings  
are shown in Fig. 1 and 4. Duct connections for vertical  
configuration are shown in Fig. 7. Field-fabricated concentric  
ductwork may be connected as shown in Fig. 8 and 9. The unit  
is designed to attach the ductwork to the roof curb. Do not  
attach duct directly to the unit.  
AIR OUT  
AIR OUT  
AIR IN  
NOTE: Do not drill in this area; damage to basepan may result in  
water leak.  
Fig. 8 — Air Distribution — Concentric Duct  
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NOTE: Dimensions A, A′, B, and B′ are obtained from field-supplied  
ceiling diffuser.  
Shaded areas indicate block-off pans.  
Fig. 9 — Concentric Duct Details  
Step 6 — Install Flue Hood and Inlet Hood —  
Flue hood (smaller hood), inlet hood (larger hood), and screens  
are shipped inside the unit in the fan section. To install, remove  
the heat panel. The flue hood is attached to the heat section  
panel from the outside using the screws provided. See Fig. 10.  
The inlet hood is installed by inserting the hood through the  
back of the heat panel. Attach the hood by inserting the screws  
provided through the clearance holes in the heat panel and into  
the intake hood.  
Install the screens into both hoods using the screws and re-  
taining nuts provided with the unit.  
FLUE HOOD  
Attach the cover of the observation hole on the intake hood  
and then replace the heat panel onto the unit to complete the in-  
stallation.  
INLET HOOD  
NOTE: When properly installed, the flue hood will line up  
with the combustion fan housing. See Fig. 11.  
Fig. 10 — Flue and Inlet Hood Locations  
Step 7 — Trap Condensate Drain — See Fig. 12  
for drain location. One 3/4-in. half coupling is provided outside  
unit evaporator section for condensate drain connection. A trap  
at least 4-in. deep must be used. See Fig. 13.  
All units must have an external trap for condensate drain-  
age. Install a trap at least 4 in. deep and protect against freeze-  
up. If drain line is installed downstream from the external trap,  
pitch the line away from the unit at 1 in. per 10 ft of run. Do not  
use a pipe size smaller than the unit connection.  
Step 8 — Install Gas Piping — Unit is equipped for  
use with natural gas. Refer to local building codes, or in the  
absence of local codes, to ANSI Z223.1-latest year and  
addendum Z223.1A-latest year entitled NFGC. In Canada,  
installation must be in accordance with the CAN1.B149.1 and  
CAN1.B149.2 installation codes for gas burning appliances.  
COMBUSTION  
FAN HOUSING  
HEAT  
EXCHANGER  
SECTION  
3
Support gas piping. For example, a /4-in. gas pipe must  
have one field-fabricated support beam every 8 ft. Therefore,  
an 18-ft long gas pipe would have a minimum of 3 support  
beams.  
INDUCED-DRAFT  
MOTOR  
MAIN BURNER  
SECTION  
Install field-supplied manual gas shutoff valve with a 1/8-in.  
NPT pressure tap for test gage connection at unit. The pressure  
tap is located on the gas manifold, adjacent to the gas valve.  
Field gas piping must include sediment trap and union. See  
Fig. 14.  
Fig. 11 — Combustion Fan Housing Location  
10  
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Step 9 — Make Electrical Connections  
FIELD POWER SUPPLY — Unit is factory wired for volt-  
age shown on unit nameplate. Be sure to check for correct  
voltage.  
Do not pressure test gas supply while connected to unit.  
Always disconnect union before servicing.  
When installing units, provide disconnect per NEC (Nation-  
al Electrical Code) of adequate size (MOCP [Maximum Over-  
current protection] of unit is on the informative plate). See  
Tables 4A and 4B. All field wiring must comply with NEC and  
local codes. Size wire based on MCA (Minimum Circuit  
Amps) on the unit informative plate. See Fig. 15 for power  
wiring connection to the unit power terminal block and equip-  
ment ground.  
IMPORTANT: Natural gas pressure at unit gas connection  
must not be less than 5.5 in. wg or greater than 13.0 in. wg.  
Size gas-supply piping for 0.5-in. wg maximum pressure  
drop. Do not use supply pipe smaller than unit gas connection.  
Route power and ground lines through control box end pan-  
el or unit basepan (see Fig. 4) to connections as shown on unit  
wiring diagram and Fig. 15.  
The correct power phasing is critical to the operation of the  
scroll compressors. An incorrect phasing will result in  
compressor shutdown on thermal overload and possible  
damage to compressor. Should this occur, power phase cor-  
rection must be made to the incoming power.  
Unit cabinet must have an uninterrupted, unbroken electri-  
cal ground to minimize the possibility of personal injury if  
an electrical fault should occur. This ground may consist of  
electrical wire connected to unit ground lug in control com-  
partment, or conduit approved for electrical ground when  
installed in accordance with NEC, ANSI/NFPA (American  
National Standards Institute/National Fire Protection Asso-  
ciation), latest edition, and local electrical codes. Do not  
use gas piping as an electrical ground. Failure to follow  
this warning could result in the installer being liable for  
personal injury of others.  
Fig. 12 — Condensate Drain Details  
Field wiring must conform to temperature limitations for  
type “T” wire. All field wiring must comply with NEC and  
local requirements.  
Operating voltage to compressor must be within voltage  
range indicated on unit nameplate. On 3-phase units, voltages  
between phases must be balanced within 2%.  
Unit failure as a result of operation on improper line voltage  
or excessive phase imbalance constitutes abuse and may cause  
damage to electrical components.  
NOTE: Trap should be deep enough to offset maximum unit static  
difference. A 4-in. trap is recommended.  
FIELD CONTROL WIRING — Unit can be controlled with  
either a Carrier-approved accessory thermostat. Install thermo-  
stat according to the installation instructions included with  
accessory. Locate thermostat assembly on a solid interior wall  
in the conditioned space to sense average temperature.  
Fig. 13 — Condensate Drain Piping Details  
Route thermostat cable or equivalent single leads of colored  
wire from subbase terminals through conduit into unit to low-  
voltage connections as shown on unit label wiring diagram and  
in Fig. 16.  
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American  
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,  
use no. 16 AWG insulated wire (35 C minimum). For over  
75 ft, use no. 14 AWG insulated wire (35 C Minimum). All  
wire larger than no. 18 AWG cannot be directly connected at  
the thermostat and will require a junction box and splice at the  
thermostat.  
Fig. 14 — Field Gas Piping  
11  
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facing outward from the unit. Install the filter track with 4  
screws provided.  
5. Apply seal strip (provided) to back flange of both hood  
sides where hood side connects to the unit back panel.  
See Fig. 18.  
6. Apply seal strip (provided) to top flange of both hood  
sides where hood sides connect to the hood top panels.  
See Fig. 18.  
7. Install hood sides to the back panels using the screws  
from Step 2. The sloped flanges point outward. The drip  
edges of the side panels should face outward as well. The  
filter guides to the hood sides. The flanges of the filter  
guides should face inward to hold the filters in place.  
See Fig. 18.  
LEGEND  
EQUIP — Equipment  
GND — Ground  
8. Apply seal strip along the entire length of the bottom  
flange of the hood top. See Fig. 18.  
9. Install the bottom part of the hood top using 4 screws pro-  
vided. See Fig. 18.  
10. Remove the packaging from filters (3) and install into the  
filter tracks. Slide the filters to the sides then place the last  
filter into the center of the filter track.  
NEC  
TB  
— National Electrical Code  
— Terminal Board  
NOTE: The maximum wire size for TB1 is 2/0.  
Fig. 15 — Field Power Wiring Connections  
NOTE: For units with manual dampers, replace the end filters  
with the manual dampers. Install the filter in the center  
between the manual dampers.  
THERMOSTAT ASSEMBLY  
REMOVABLE JUMPER  
L
11. Install the filter retainer track along the bottom edge of  
the outdoor air hood using 4 screws provided. See  
Fig. 18.  
RH  
RC  
Y1  
Y2  
W1  
W2  
G
C
X
12. Install top section of the outdoor air hood using 9 screws  
provided. See Fig. 18. See Fig. 19 for a picture of the as-  
sembled outdoor air hood.  
TB2-  
J11  
R
1
Y1  
2
Y2  
3
W1  
4
W2  
5
G
6
C
7
X
8
Fig. 16 — Field Control Thermostat Wiring  
NOTE: For filter removal, remove the four screws holding the  
filter retainer. The filters can then be removed, cleaned, or  
replaced. Install the filters by reversing the procedure.  
MANUAL DAMPER ASSEMBLY — For units equipped  
with manual dampers, the assembly process is similar to the  
outdoor air hood for units with economizers. There are two  
slide dampers shipped with the unit to allow for manual setting  
of the outside air volume. When assembling the hood, place  
one of the manual slide dampers in each of the end positions  
and the remaining filter in the center position. The manual  
dampers can then be moved to the appropriate position and  
then locked into place using the screws mounted in the adjust-  
ment slots. See Fig. 20.  
Set heat anticipator settings as follows:  
STAGE 1  
(W1) ON  
0.98  
STAGE 1 AND 2  
(W1 AND W2) ON  
VOLTAGE  
All  
0.44  
Settings may be changed slightly to provide a greater degree  
of comfort for a particular installation.  
Step 10 — Install Outdoor Air Hood — Per-  
form the following procedure to install the outdoor-air hood on  
units equipped with an economizer, two-position damper, or  
manual outdoor air damper:  
1. Remove blank panel from return end of unit (hood sec-  
tion). Save the screws. See Fig. 17 for shipping location  
of components.  
HOOD  
SIDE  
HOOD TOP  
(BOTTOM HALF)  
HOOD TOP  
(TOP HALF)  
HOOD  
SIDE  
2. Hood sides are fastened to sides of outdoor air opening.  
Remove the hood sides and save the screws (3 each side).  
3. Remove the bracket holding the bottom half of the hood  
in the shipping position. Remove the hood bottom half  
and filters (or manual dampers on units so equipped)  
from outdoor section.  
RETURN AIR  
SECTION  
NOTE: On units without economizers, the components  
are attached to the unit basepan. To access the compo-  
nents, remove the panel below the outdoor air intake  
section.  
Fig. 17 — Outdoor-Air Hood Component  
Shipping Location  
4. Remove inner filter track from shipping position in out-  
door section. Position inner filter track so the track is  
12  
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Table 4A — Electrical Data (Units Without Optional Powered Convenience Outlet)  
COMPRESSOR  
No. 2  
POWER SUPPLY  
VOLTAGE  
RANGE  
POWER  
COMBUSTION  
FAN MOTOR  
POWER  
UNITS WITH  
OPTIONAL HACR  
BREAKER  
DISCONNECT  
SIZE  
OFM  
IFM  
UNIT NOMINAL  
EXHAUST  
SUPPLY*  
No. 1  
No. 3  
SIZE  
VOLTAGE  
48HG (3 Ph, 60 Hz)  
FLA  
(ea)  
FLA  
Min Max RLA LRA RLA LRA RLA LRA Qty Hp  
Hp  
FLA  
Qty Hp  
FLA  
MCA  
MOCP  
MCA  
MOCP  
FLA  
(ea)  
—
—
2
—
1
80/ 79 100/100 80/ 80 100/100  
92/ 91 100/100 92/ 92 100/100  
86/ 85 100/100 86/ 86 100/100  
98/ 96 100/100 98/ 98 100/100  
94/ 91 100/100 94/ 94 100/100  
105/103 125/125 105/105 125/125  
101/ 97 125/100 101/101 125/125  
113/109 125/125 113/113 125/125  
84/ 83  
98/ 96  
91/ 89  
105/103  
100/ 97  
113/111  
107/104  
121/118  
44  
3.7 10.6/ 9.6  
5.9  
—
—
2
—
1
5
16.7/15.2  
5.9  
—
208/230  
187 253 28.2 208 28.2 208  
—
—
4
0.25 1.5  
0.5  
—
2
—
1
7.5 24.2/22  
10 30.8/28  
5.9  
—
—
2
—
1
5.9  
—
—
2
—
1
42  
48  
45  
51  
48  
55  
51  
58  
38  
43  
41  
45  
43  
47  
50  
60  
60  
60  
60  
60  
60  
60  
50  
50  
50  
50  
50  
60  
42  
48  
45  
51  
48  
55  
51  
58  
38  
43  
41  
45  
43  
47  
50  
60  
60  
60  
60  
60  
60  
60  
50  
50  
50  
50  
50  
60  
3.7  
5
4.8  
7.6  
11  
14  
6.1  
9
3.1  
—
51  
—
2
—
1
47  
20  
3.1  
—
55  
460  
414 506 15.4 104 15.4 104  
518 633 12.8 83 12.8 83  
187 253 32.1 240 32.1 240  
—
—
—
—
—
—
4
4
6
0.25 0.7  
0.3  
0.24  
0.5  
—
2
—
1
51  
7.5  
10  
5
3.1  
—
58  
—
2
—
1
55  
3.1  
—
62  
—
2
—
1
40  
2.4  
—
45  
—
2
—
1
43  
575  
0.25 0.7 7.5  
10  
2.4  
—
49  
—
2
—
1
45  
11  
2.4  
—
51  
—
2
—
1
92/ 91 100/100 92/ 92 100/100  
104/103 125/125 104/104 125/125  
98/ 96 100/100 98/ 98 100/100  
110/108 125/125 110/110 125/125  
105/103 125/125 105/105 125/125  
117/115 125/125 117/117 125/125  
112/109 125/125 112/112 125/125  
124/121 150/150 124/124 150/150  
96/ 95  
110/109  
103/102  
117/115  
112/109  
126/123  
120/116  
133/130  
46  
3.7 10.6/ 9.6  
5.9  
—
—
2
—
1
5
16.7/15.2  
5.9  
—
208/230  
0.25 1.5  
—
2
—
1
7.5 24.2/22  
10 30.8/28  
5.9  
—
—
2
—
1
5.9  
—
—
2
—
1
44  
50  
46  
53  
50  
56  
53  
59  
39  
44  
42  
47  
44  
49  
50  
60  
60  
60  
60  
60  
60  
60  
50  
50  
50  
50  
50  
60  
44  
50  
46  
53  
50  
56  
53  
59  
39  
44  
42  
47  
44  
49  
50  
60  
60  
60  
60  
60  
60  
60  
50  
50  
50  
50  
50  
60  
3.7  
5
4.8  
7.6  
3.1  
—
53  
—
2
—
1
49  
24  
3.1  
—
56  
460  
414 506 15.4 110 15.4 110  
—
—
6
0.25 0.7  
0.3  
—
2
—
1
53  
7.5  
10  
5
11  
3.1  
—
60  
—
2
—
1
56  
14  
3.1  
—
63  
—
2
—
1
41  
6.1  
2.4  
—
47  
—
2
—
1
45  
575  
518 633 12.8 88 12.8 88  
—
—
6
6
6
6
0.25 0.7 7.5  
9
0.24  
2.4  
—
50  
—
2
—
1
47  
10  
5
11  
2.4  
—
52  
—
2
—
1
117/116 125/125 117/117 125/125  
129/128 150/150 129/129 150/150  
125/123 150/150 125/125 150/150  
137/134 150/150 137/137 150/150  
132/129 150/150 132/132 150/150  
144/140 150/150 144/144 150/150  
127/125  
140/139  
135/133  
149/147  
143/140  
157/153  
67  
16.7/15.2  
5.9  
—
—
2
—
1
208/230  
187 253 28.2 208 28.2 208 28.2 208  
414 506 15.4 104 15.4 104 15.4 104  
518 633 12.8 83 12.8 83 12.8 83  
0.25 1.5 7.5 24.2/22  
10 30.8/28  
0.5  
5.9  
—
—
2
—
1
5.9  
—
—
2
—
1
62  
68  
65  
71  
68  
74  
52  
57  
55  
60  
57  
62  
70  
80  
80  
80  
80  
80  
60  
60  
60  
60  
60  
70  
62  
68  
65  
71  
68  
74  
52  
57  
55  
60  
57  
62  
70  
80  
80  
80  
80  
80  
60  
60  
60  
60  
60  
70  
5
7.6  
11  
14  
6.1  
9
3.1  
—
74  
—
2
—
1
71  
28  
460  
575  
0.25 0.7 7.5  
0.3  
3.1  
—
78  
—
2
—
1
74  
10  
3.1  
—
81  
—
2
—
1
56  
5
0.25 0.7 7.5  
10  
2.4  
—
62  
—
2
—
1
59  
0.24  
2.4  
—
65  
—
2
—
1
62  
11  
2.4  
67  
See Legend and Notes on page 15.  
13  
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Table 4B — Electrical Data (Units With Optional Powered Convenience Outlet)  
COMPRESSOR  
No. 2  
POWER SUPPLY  
VOLTAGE  
RANGE  
POWER  
COMBUSTION  
FAN MOTOR  
POWER  
UNITS WITH  
OPTIONAL HACR  
BREAKER  
DISCONNECT  
SIZE  
OFM  
IFM  
UNIT NOMINAL  
EXHAUST  
SUPPLY*  
No. 1  
No. 3  
SIZE  
VOLTAGE  
48HG (3 Ph, 60 Hz)  
FLA  
(ea)  
FLA  
Min Max RLA LRA RLA LRA RLA LRA Qty Hp  
Hp  
3.7 10.6/ 9.6  
16.7/15.2  
FLA  
Qty Hp  
FLA  
MCA  
MOCP  
MCA  
MOCP  
FLA  
(ea)  
—
—
2
—
1
85/ 84 100/100 85/ 85 100/100  
97/ 96 100/100 97/ 97 100/100  
91/ 90 100/100 91/ 91 100/100  
103/101 125/125 103/103 125/125  
99/ 96 100/100 99/ 99 100/100  
110/108 125/125 110/110 125/125  
106/102 125/125 106/106 125/125  
118/114 125/125 118/118 125/125  
90/ 89  
103/102  
97/ 95  
110/109  
105/103  
119/116  
113/110  
127/123  
48  
5.9  
—
—
2
—
1
5
5.9  
—
208/230  
187 253 28.2 208 28.2 208  
—
—
4
0.25 1.5  
0.5  
—
2
—
1
7.5 24.2/22  
10 30.8/28  
5.9  
—
—
2
—
1
5.9  
—
—
2
—
1
45  
51  
48  
54  
51  
58  
54  
61  
41  
46  
44  
48  
46  
50  
60  
60  
60  
60  
60  
60  
60  
70  
50  
50  
50  
60  
50  
60  
45  
51  
48  
54  
51  
58  
54  
61  
41  
46  
44  
48  
46  
50  
60  
60  
60  
60  
60  
60  
60  
70  
50  
50  
50  
60  
50  
60  
3.7  
5
4.8  
7.6  
11  
14  
6.1  
9
3.1  
—
55  
—
2
—
1
51  
20  
3.1  
—
58  
460  
414 506 15.4 104 15.4 104  
518 633 12.8 83 12.8 83  
187 253 32.1 240 32.1 240  
—
—
—
—
—
—
4
4
6
0.25 0.7  
0.3  
0.24  
0.5  
—
2
—
1
55  
7.5  
10  
5
3.1  
—
62  
—
2
—
1
58  
3.1  
—
65  
—
2
—
1
43  
2.4  
—
49  
—
2
—
1
46  
575  
0.25 0.7 7.5  
10  
2.4  
—
52  
—
2
—
1
49  
11  
2.4  
—
54  
—
2
—
1
97/ 96 100/100 97/ 97 100/100  
109/108 125/125 109/109 125/125  
103/101 125/125 103/103 125/125  
115/113 125/125 115/115 125/125  
110/108 125/125 110/110 125/125  
122/120 150/150 122/122 150/150  
117/114 125/125 117/117 125/125  
129/126 150/150 129/129 150/150  
102/101  
116/115  
109/107  
123/121  
118/115  
131/129  
125/122  
139/136  
49  
3.7 10.6/ 9.6  
16.7/15.2  
5.9  
—
—
2
—
1
5
5.9  
—
208/230  
0.25 1.5  
—
2
—
1
7.5 24.2/22  
10 30.8/28  
5.9  
—
—
2
—
1
5.9  
—
—
2
—
1
47  
53  
49  
56  
53  
59  
56  
62  
42  
47  
45  
50  
47  
52  
60  
60  
60  
60  
60  
60  
60  
70  
50  
50  
50  
60  
50  
60  
47  
53  
49  
56  
53  
59  
56  
62  
42  
47  
45  
50  
47  
52  
60  
60  
60  
60  
60  
60  
60  
70  
50  
50  
50  
60  
50  
60  
3.7  
5
4.8  
3.1  
—
56  
—
2
—
1
52  
24  
7.6  
3.1  
—
60  
460  
414 506 15.4 110 15.4 110  
—
—
6
0.25 0.7  
0.3  
—
2
—
1
56  
7.5  
10  
5
11  
3.1  
—
63  
—
2
—
1
60  
14  
3.1  
—
67  
—
2
—
1
45  
6.1  
2.4  
—
50  
—
2
—
1
48  
575  
518 633 12.8 88 12.8 88  
—
—
6
6
6
6
0.25 0.7 7.5  
9
11  
0.24  
2.4  
—
54  
—
2
—
1
50  
10  
5
2.4  
—
56  
—
2
—
1
122/121 150/125 122/122 150/150  
134/133 150/150 134/134 150/150  
130/128 150/150 130/130 150/150  
142/139 150/150 142/142 150/150  
137/134 150/150 137/137 150/150  
149/145 175/150 149/149 175/175  
133/131  
146/144  
141/139  
155/152  
149/146  
162/159  
70  
16.7/15.2  
5.9  
—
—
2
—
1
208/230  
187 253 28.2 208 28.2 208 28.2 208  
414 506 15.4 104 15.4 104 15.4 104  
518 633 12.8 83 12.8 83 12.8 83  
0.25 1.5 7.5 24.2/22  
10 30.8/28  
0.5  
5.9  
—
—
2
—
1
5.9  
—
—
2
—
1
65  
71  
68  
74  
71  
77  
55  
60  
58  
63  
60  
65  
80  
80  
80  
80  
80  
90  
60  
60  
60  
70  
60  
70  
65  
71  
68  
74  
71  
77  
55  
60  
58  
63  
60  
65  
80  
80  
80  
80  
80  
90  
60  
60  
60  
70  
60  
70  
5
7.6  
11  
14  
6.1  
9
3.1  
—
77  
—
2
—
1
74  
28  
460  
575  
0.25 0.7 7.5  
0.3  
3.1  
—
81  
—
2
—
1
78  
10  
3.1  
—
85  
—
2
—
1
59  
5
0.25 0.7 7.5  
10  
2.4  
—
65  
—
2
—
1
63  
0.24  
2.4  
—
68  
—
2
—
1
65  
11  
2.4  
71  
14  
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LEGEND AND NOTES FOR TABLES 4A AND 4B  
LEGEND  
EXAMPLE: Supply voltage is 460-3-60.  
AB = 452 v  
FLA  
— Full Load Amps  
HACR — Heating, Air Conditioning and Refrigeration  
BC = 464 v  
AC = 455 v  
IFM  
LRA  
— Indoor (Evaporator) Fan Motor  
— Locked Rotor Amps  
452 + 464 + 455  
MCA — Minimum Circuit Amps  
Average Voltage=  
3
MOCP — Maximum Overcurrent Protection  
1371  
NEC  
— National Electrical Code  
=
OFM — Outdoor (Condenser) Fan Motor  
RLA — Rated Load Amps  
3
= 457  
Determine maximum deviation from average voltage.  
*Fuse or HACR circuit breaker.  
(AB) 457 - 452 = 5 v  
(BC) 464 - 457 = 7 v  
(AC) 457 - 455 = 2 v  
Maximum deviation is 7 v.  
Determine percent voltage imbalance.  
7
% Voltage Imbalance = 100 x  
457  
NOTES:  
= 1.53%  
1. In compliance with NEC requirements for multimotor and com-  
bination load equipment (refer to NEC Articles 430 and 440),  
the overcurrent protective device for the unit shall be fuse or  
HACR breaker. Canadian units may be fuse or circuit breaker.  
2. Unbalanced 3-Phase Supply Voltage  
This amount of phase imbalance is satisfactory as it is below the  
maximum allowable 2%.  
IMPORTANT: If the supply voltage phase imbalance is more  
than 2%, contact the local electric utility company immediately.  
Never operate a motor where a phase imbalance in supply volt-  
age is greater than 2%. Use the following formula to determine  
the percent voltage imbalance.  
3. The convenience outlet full load amps (FLA) are 5, 3, and 3 for  
208/230, 460, 575-V units, respectively.  
% Voltage Imbalance  
max voltage deviation from average voltage  
= 100 x  
average voltage  
TOP HOOD  
SECTION  
ADD  
SEAL  
STRIP  
SEAL  
HOOD  
SIDE  
ADD  
SEAL  
STRIP  
STRIP  
LOCATION  
INNER  
FILTER  
TRACK  
BOTTOM  
HOOD  
SECTION  
ADD  
SEAL  
STRIP  
ADD  
SEAL  
STRIP  
FILTER  
GUIDE  
FILTER  
RETAINER  
FILTER  
GUIDE  
FILTER  
HOOD  
SIDE  
MANUAL  
DAMPER  
(IF EQUIPPED)  
UNIT  
BACK  
PANEL  
NOTE: Units with manual damper only use one filter.  
Fig. 18 — Outdoor-Air Hood Details  
15  
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2. Pivot the damper assembly outward until top edge of the  
damper assembly rests against the inside wall of unit.  
3. Secure each damper assembly to unit with 6 screws  
across top (3 screws provided) and bottom (3 screws  
from Step 1) of damper.  
4. With screws saved from Step 1, install brackets on each  
side of damper assembly. See Fig. 22.  
5. Remove tape from damper blades.  
Step 12 — Non-Fused Disconnect — The handle  
for the factory-installed non-fused disconnect is shipped inside  
the unit to prevent the handle from damage during shipping.  
Follow these steps to complete installation of the handle.  
BE SURE POWER IS SHUT OFF TO THE UNIT FROM  
THE BUILDING POWER SUPPLY. Electrical shock  
could cause personal injury.  
1. Open the control box access door.  
2. Remove the small cover plate located on the unit corner  
post near the control section.  
Fig. 19 — Outdoor-Air Hood Assembled  
3. Remove the inner control box cover. The handle and shaft  
are located in a plastic bag at the bottom of the control  
box.  
4. Insert the square shaft into the disconnect with the pins  
vertical. On the 100-amp disconnect, the shaft is keyed  
into the disconnect and can only be installed one way  
(with the pins vertical).  
5. Insert the handle through the corner post and onto the  
shaft with the handle positioned so that “OFF” is on top.  
6. Rotate the handle to the “ON” position to lock the pins  
into the handle.  
7. From the inside of the corner post, attach the handle  
mounting screws to the handle. Slide the shaft fully into  
the handle and tighten the set screw(s) on the disconnect  
to lock the shaft. Tighten the screws that attach the handle  
to the corner post.  
LOCKING SCREW  
MOVEABLE DAMPER  
AIR FILTER POSITION  
MOVEABLE DAMPER  
Fig. 20 — Manual Damper Details  
8. Rotate the handle back to the “OFF” position.  
9. Replace all panels and doors. Power can now be turned  
back on to the unit.  
Step 11 — Position Optional Power Exhaust or  
Barometric Relief Damper Hood — The optional  
power exhaust or barometric relief dampers are shipped  
assembled and tilted back into the unit for shipping. Brackets  
and extra screws are shipped in shrink wrap around the  
dampers.  
1. Remove 9 screws holding each damper assembly in  
place. See Fig. 21. Each damper assembly is secured with  
3 screws on each side and 3 screws along the bottom.  
Save screws.  
Step 13 — Install All Accessories — After all of  
the factory-installed options have been adjusted, install all  
field-installed accessories. Refer to the accessory installation  
instructions included with each accessory. Consult the Carrier  
Price Pages for accessory package numbers for particular  
applications.  
Be careful when tilting blower assembly. Hoods and blow-  
ers are heavy and can cause injury if dropped.  
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Fig. 21 — Power Exhaust or Barometric Relief Damper Mounting Details  
Fig. 22 — Bracket and Hood Positioning  
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PRE-START-UP  
START-UP  
Use the following information and Start-Up Checklist on  
page CL-1 to check out unit PRIOR to start-up.  
Failure to observe the following warnings could result in  
serious personal injury.  
1. Follow recognized safety practices and wear protective  
goggles when checking or the servicing refrigerant  
system.  
2. Do not operate the compressor or provide any electric  
power to the unit unless the compressor terminal cover  
is in place and secured.  
3. Do not remove the compressor terminal cover until all  
electrical sources are disconnected.  
4. Relieve all pressure from the system before touching or  
disturbing anything inside the compressor terminal box  
if refrigerant leak is suspected around the compressor  
terminals.  
5. Never attempt to repair a soldered connection while the  
refrigerant system is under pressure.  
Unit Preparation — Check that unit has been installed in  
accordance with these installation instructions and all applica-  
ble codes.  
Compressor Mounting — Compressors are internally  
spring mounted. Do not loosen or remove compressor hold-  
down bolts.  
Refrigerant Service Ports — Each independent re-  
frigerant system has a total of 3 Schrader-type service gage  
ports per circuit. One port is located on the suction line, one on  
the compressor discharge line, and one on the liquid line. Be  
sure that caps on the ports are tight.  
Crankcase Heater(s) — Crankcase heaters are ener-  
gized as long as there is power to the unit and the compressor is  
not operating.  
6. Do not use torch to remove any component. The sys-  
tem contains oil and refrigerant under pressure. To  
remove a component, wear protective goggles and pro-  
ceed as follows:  
IMPORTANT: Unit power must be on for 24 hours prior  
to start-up. Otherwise, damage to compressor may  
result.  
a. Shut off gas and then electrical power to the unit.  
Install lockout tag.  
Compressor Rotation — On 3-phase units, it is impor-  
tant to be certain the scroll compressor is rotating in the proper  
direction. To determine whether or not compressor is rotating  
in the proper direction:  
1. Connect service gages to suction and discharge pressure  
fittings.  
b. Relieve all pressure from the system using both  
high-pressure and low-pressure ports.  
c. Cut the component connection tubing with a tubing  
cutter, and remove the component from the unit.  
d. Carefully unsweat the remaining tubing stubs when  
necessary. Oil can ignite when exposed to torch  
flame.  
2. Energize the compressor.  
3. The suction pressure should drop and the discharge pres-  
sure should rise, as is normal on any start-up.  
If the suction pressure does not drop and the discharge pres-  
sure does not rise to normal levels:  
Proceed as follows to inspect and prepare the unit for initial  
start-up:  
1. Remove all access panels.  
1. Note that the evaporator fan is probably also rotating in  
the wrong direction.  
2. Turn off power to the unit and install lockout tag.  
3. Reverse any two of the unit power leads.  
4. Turn on power to the unit.  
The suction and discharge pressure levels should now move  
to their normal start-up levels.  
NOTE: When the compressor is rotating in the wrong direc-  
tion, the unit makes an elevated level of noise and does not  
provide heating or cooling.  
2. Read and follow instructions on all WARNING, CAU-  
TION, and INFORMATION labels attached to, or  
shipped with, the unit.  
3. Make the following inspections:  
a. Inspect for shipping and handling damages such as  
broken lines, loose parts, or disconnected wires, etc.  
b. Inspect for oil at all refrigerant tubing connections  
and on unit base. Detecting oil generally indicates a  
refrigerant leak. Leak-test all refrigerant tubing con-  
nections using an electronic leak detector, halide  
torch, or liquid-soap solution.  
c. Inspect all field-wiring and factory-wiring connec-  
tions. Be sure that connections are completed and  
tight.  
d. Inspect coil fins. If damaged during shipping and  
handling, carefully straighten the fins with a fin  
comb.  
Compressor damage will occur if rotation is not immedi-  
ately corrected.  
Internal Wiring — Check all electrical connections in  
unit control boxes; tighten as required.  
4. Verify the following conditions:  
Subcooler Heat Exchanger (SHX) — The subcool-  
er heat exchanger adds approximately 10 to 15° F of sub-  
cooling to the system. Check all valves and TXV (thermostatic  
expansion valve).  
a. Make sure that condenser fan blade is correctly  
positioned in the fan orifice. See Condenser-Fan  
Adjustment section on page 49 for more details.  
b. Make sure that air filter(s) is in place.  
Evaporator Fan — Fan belt and variable pulleys are  
factory-installed. See Tables 5-23 for fan performance data. Be  
sure that fans rotate in the proper direction. See Table 24 for air  
quantity limits. See Table 25 for evaporator fan motor specifi-  
cations. See Table 26 for accessory/FIOP static pressure. See  
Table 27 for fan rpm at various motor pulley settings. To alter  
fan performance, see Evaporator Fan Performance Adjustment  
section on page 48.  
c. Make sure that condensate drain trap is filled with  
water to ensure proper drainage.  
d. Make sure that all tools and miscellaneous loose parts  
have been removed.  
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3. Connect pressure gage to manifold pressure tap.  
Condenser Fans and Motors — Condenser fans and  
motors are factory set. Refer to Condenser-Fan Adjustment  
section (page 49) as required.  
4. Turn on field-supplied manual gas stop. Temporarily  
install the jumper wire between “R” and “W1” on TB2.  
Set thermostat to HEAT and raise set point until heat  
comes on.  
5. After the unit has run for several minutes, verify the sup-  
ply gas pressure is between 5.5 in. wg to 13.0 in. wg, and  
the manifold pressure is 2.95 in. wg on horizontal dis-  
charge applications and 3.00 on vertical discharge appli-  
cations. If manifold pressure must be adjusted, refer to  
Gas Valve Adjustment section.  
NOTE: Supply gas pressure must not exceed 13.0 in. wg.  
6. Set thermostat to OFF.  
7. Remove jumper wire if the unit will be operating under  
thermostat mode.  
Return-Air Filters — Check that correct filters are in-  
stalled in filter tracks (see Table 1). Do not operate unit without  
return-air filters.  
NOTE: For units with 4-in. filter option, units are shipped with  
standard 2-in. filters. To install 4-in. filters, the filter spacers  
must be removed.  
Outdoor-Air Inlet Screens — Outdoor-air inlet screens  
must be in place before operating unit.  
Gas Heat — Verify gas pressures before turning on heat as  
follows:  
1. Turn off field-supplied manual gas stop, located external  
to unit.  
8. Return thermostat to desired set point.  
2. Connect pressure gage to supply gas tap, located on field-  
supplied manual shutoff valve (see Fig. 14).  
Table 5 — Fan Performance — 48PGD20 Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
0.6  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.8  
1.0  
Rpm  
590  
633  
677  
722  
767  
813  
859  
906  
952  
Bhp  
1.47  
1.82  
2.21  
2.67  
3.17  
3.74  
4.36  
5.05  
5.81  
Rpm  
663  
703  
744  
786  
828  
871  
915  
959  
1004  
Bhp  
1.74  
2.11  
2.53  
3.01  
3.53  
4.12  
4.77  
5.47  
6.25  
Rpm  
727  
764  
803  
842  
883  
924  
966  
1008  
1051  
Bhp  
2.01  
2.40  
2.84  
3.33  
3.88  
4.48  
5.15  
5.87  
6.67  
Rpm  
786  
Bhp  
2.26  
2.67  
3.13  
3.64  
4.21  
4.83  
5.52  
6.26  
7.07  
Rpm  
840  
Bhp  
2.52  
2.94  
3.42  
3.95  
4.53  
5.18  
5.88  
6.64  
7.47  
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
820  
872  
A
A
857  
907  
A
A
894  
942  
979  
933  
A
C
B
C
972  
1017  
1056  
1096  
1136  
B
C
B
C
1012  
1053  
1095  
B
C
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
891  
Bhp  
2.77  
3.21  
3.70  
4.25  
4.85  
5.51  
6.23  
7.01  
7.86  
Rpm  
940  
968  
Bhp  
3.02  
3.48  
3.99  
4.55  
5.17  
5.84  
6.58  
7.38  
8.24  
Rpm  
987  
Bhp  
3.27  
3.74  
4.27  
4.85  
5.48  
6.17  
6.92  
7.74  
8.61  
Rpm  
1032  
1057  
1084  
1114  
1145  
1178  
1213  
1248  
1285  
Bhp  
3.52  
4.01  
4.55  
5.14  
5.79  
6.50  
7.26  
8.09  
8.99  
Rpm  
1076  
1099  
1125  
1153  
1183  
1215  
1249  
1283  
1319  
Bhp  
3.77  
4.27  
4.83  
5.44  
6.10  
6.82  
7.60  
8.45  
9.36  
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
A
B
921  
1014  
1042  
1073  
1106  
1140  
1176  
1212  
1250  
B
B
D
954  
999  
B
B
988  
1032  
1066  
1101  
1138  
1175  
1214  
C
D
1024  
1060  
1098  
1137  
1176  
C
D
C
D
C
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)  
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSUSRE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
607  
652  
699  
746  
794  
842  
891  
940  
990  
Bhp  
1.53  
1.90  
2.32  
2.79  
3.33  
3.93  
4.59  
5.32  
6.12  
Rpm  
677  
719  
763  
807  
851  
897  
943  
990  
1037  
Bhp  
1.80  
2.19  
2.63  
3.12  
3.68  
4.30  
4.98  
5.72  
6.54  
Rpm  
740  
779  
819  
861  
904  
947  
991  
1036  
1082  
Bhp  
2.06  
2.47  
2.93  
3.44  
4.02  
4.65  
5.35  
6.11  
6.95  
Rpm  
797  
Bhp  
2.31  
2.74  
3.22  
3.75  
4.34  
5.00  
5.71  
6.49  
7.35  
Rpm  
850  
Bhp  
2.57  
3.01  
3.50  
4.05  
4.66  
5.33  
6.07  
6.87  
7.73  
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
833  
884  
A
B
A
872  
921  
A
A
911  
958  
A
C
952  
998  
B
C
994  
1038  
1079  
1121  
1163  
1036  
1080  
1124  
B
C
B
C
C
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
900  
Bhp  
2.82  
3.27  
3.79  
4.35  
4.98  
5.67  
6.42  
7.23  
8.12  
Rpm  
949  
Bhp  
3.06  
3.54  
4.07  
4.65  
5.29  
5.99  
6.76  
7.59  
8.49  
Rpm  
995  
Bhp  
3.31  
3.80  
4.35  
4.94  
5.60  
6.32  
7.10  
7.95  
8.87  
Rpm  
1040  
1066  
1095  
1127  
1160  
1195  
1231  
1269  
1308  
Bhp  
3.56  
4.06  
4.62  
5.24  
5.91  
6.64  
7.44  
8.30  
9.23  
Rpm  
1083  
1108  
1135  
1165  
1197  
1231  
1267  
1303  
1341  
Bhp  
3.81  
4.33  
4.90  
5.53  
6.22  
6.96  
7.78  
8.65  
9.60  
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
A
B
933  
979  
1023  
1054  
1087  
1122  
1158  
1195  
1234  
1273  
B
B
D
967  
1011  
1046  
1082  
1119  
1158  
1198  
1238  
B
B
1003  
1041  
1079  
1119  
1160  
1202  
C
D
C
D
C
D
C
D
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)  
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 7 — Fan Performance — 48PGF20 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
607  
652  
699  
746  
794  
842  
891  
940  
990  
Bhp  
1.53  
1.90  
2.32  
2.79  
3.33  
3.93  
4.59  
5.32  
6.12  
Rpm  
677  
719  
763  
807  
851  
897  
943  
990  
1037  
Bhp  
1.80  
2.19  
2.63  
3.12  
3.68  
4.30  
4.98  
5.72  
6.54  
Rpm  
740  
779  
819  
861  
904  
947  
991  
1036  
1082  
Bhp  
2.06  
2.47  
2.93  
3.44  
4.02  
4.65  
5.35  
6.11  
6.95  
Rpm  
797  
Bhp  
2.31  
2.74  
3.22  
3.75  
4.34  
5.00  
5.71  
6.49  
7.35  
Rpm  
850  
Bhp  
2.57  
3.01  
3.50  
4.05  
4.66  
5.33  
6.07  
6.87  
7.73  
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
833  
884  
A
A
872  
921  
A
A
911  
958  
A
C
952  
998  
B
C
994  
1038  
1079  
1121  
1163  
B
C
1036  
1080  
1124  
B
C
B
C
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
900  
Bhp  
2.82  
3.27  
3.79  
4.35  
4.98  
5.67  
6.42  
7.23  
8.12  
Rpm  
949  
Bhp  
3.06  
3.54  
4.07  
4.65  
5.29  
5.99  
6.76  
7.59  
8.49  
Rpm  
995  
Bhp  
3.31  
3.80  
4.35  
4.94  
5.60  
6.32  
7.10  
7.95  
8.87  
Rpm  
1040  
1066  
1095  
1127  
1160  
1195  
1231  
1269  
1308  
Bhp  
3.56  
4.06  
4.62  
5.24  
5.91  
6.64  
7.44  
8.30  
9.23  
Rpm  
1083  
1108  
1135  
1165  
1197  
1231  
1267  
1303  
1341  
Bhp  
3.81  
4.33  
4.90  
5.53  
6.22  
6.96  
7.78  
8.65  
9.60  
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
A
B
933  
979  
1023  
1054  
1087  
1122  
1158  
1195  
1234  
1273  
B
B
D
967  
1011  
1046  
1082  
1119  
1158  
1198  
1238  
B
B
1003  
1041  
1079  
1119  
1160  
1202  
C
D
C
C
D
C
D
D
LEGEND  
Bhp — Brake Horsepower Input to Fan  
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)  
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 8 — Fan Performance — 48PGD24 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
633  
677  
722  
767  
813  
859  
906  
952  
999  
1047  
Bhp  
1.82  
2.21  
2.67  
3.17  
3.74  
4.36  
5.05  
5.81  
6.63  
7.53  
Rpm  
703  
Bhp  
2.11  
2.53  
3.01  
3.53  
4.12  
4.77  
5.47  
6.25  
7.09  
8.00  
Rpm  
764  
Bhp  
2.40  
2.84  
3.33  
3.88  
4.48  
5.15  
5.87  
6.67  
7.53  
8.46  
Rpm  
820  
Bhp  
2.67  
3.13  
3.64  
4.21  
4.83  
5.52  
6.26  
7.07  
7.95  
8.90  
Rpm  
872  
Bhp  
2.94  
3.42  
3.95  
4.53  
5.18  
5.88  
6.64  
7.47  
8.36  
9.33  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
A
B
744  
803  
857  
907  
A
A
B
A
786  
842  
894  
942  
979  
A
C
828  
883  
933  
871  
924  
972  
1017  
1056  
1096  
1136  
1177  
1219  
B
C
915  
959  
966  
1012  
1053  
1095  
1137  
1180  
B
C
1008  
1051  
1094  
1138  
C
D
1004  
1049  
1094  
C
D
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
921  
Bhp  
3.21  
3.70  
4.25  
4.85  
5.51  
6.23  
7.01  
7.86  
8.77  
9.75  
Rpm  
968  
Bhp  
3.48  
3.99  
4.55  
5.17  
5.84  
6.58  
7.38  
8.24  
9.17  
10.16  
Rpm  
1014  
1042  
1073  
1106  
1140  
1176  
1212  
1250  
1288  
1327  
Bhp  
3.74  
4.27  
4.85  
5.48  
6.17  
6.92  
7.74  
8.61  
9.56  
10.57  
Rpm  
1057  
1084  
1114  
1145  
1178  
1213  
1248  
1285  
1322  
1360  
Bhp  
4.01  
4.55  
5.14  
5.79  
6.50  
7.26  
8.09  
8.99  
9.95  
10.98  
Rpm  
1099  
1125  
1153  
1183  
1215  
1249  
1283  
1319  
1355  
1393  
Bhp  
4.27  
4.83  
5.44  
6.10  
6.82  
7.60  
8.45  
9.36  
10.33  
11.38  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
A
954  
999  
B
C
B
D
B
B
988  
1032  
1066  
1101  
1138  
1175  
1214  
1253  
1292  
B
1024  
1060  
1098  
1137  
1176  
1216  
1256  
C
D
C
D
D
C
D
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)  
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 9 — Fan Performance — 48PGE24 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
652  
699  
746  
794  
842  
891  
940  
990  
1039  
1089  
Bhp  
1.90  
2.32  
2.79  
3.33  
3.93  
4.59  
5.32  
6.12  
7.00  
7.95  
Rpm  
719  
Bhp  
2.19  
2.63  
3.12  
3.68  
4.30  
4.98  
5.72  
6.54  
7.43  
8.40  
Rpm  
779  
Bhp  
2.47  
2.93  
3.44  
4.02  
4.65  
5.35  
6.11  
6.95  
7.85  
8.83  
Rpm  
833  
Bhp  
2.74  
3.22  
3.75  
4.34  
5.00  
5.71  
6.49  
7.35  
8.27  
9.26  
Rpm  
884  
Bhp  
3.01  
3.50  
4.05  
4.66  
5.33  
6.07  
6.87  
7.73  
8.67  
9.69  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
A
B
763  
819  
872  
921  
A
B
A
A
807  
861  
911  
958  
A
C
851  
904  
952  
998  
897  
947  
994  
1038  
1079  
1121  
1163  
1207  
1251  
B
C
D
943  
990  
991  
1036  
1080  
1124  
1168  
1213  
B
C
1036  
1082  
1128  
1174  
C
D
1037  
1085  
1133  
C
D
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
933  
Bhp  
3.27  
3.79  
4.35  
4.98  
5.67  
6.42  
7.23  
8.12  
9.07  
10.10  
Rpm  
979  
Bhp  
3.54  
4.07  
4.65  
5.29  
5.99  
6.76  
7.59  
8.49  
9.46  
10.51  
Rpm  
1023  
1054  
1087  
1122  
1158  
1195  
1234  
1273  
1314  
1355  
Bhp  
3.80  
4.35  
4.94  
5.60  
6.32  
7.10  
7.95  
8.87  
9.85  
10.91  
Rpm  
1066  
1095  
1127  
1160  
1195  
1231  
1269  
1308  
1347  
1387  
Bhp  
4.06  
4.62  
5.24  
5.91  
6.64  
7.44  
8.30  
9.23  
10.24  
11.31  
Rpm  
1108  
1135  
1165  
1197  
1231  
1267  
1303  
1341  
1379  
—
Bhp  
4.33  
4.90  
5.53  
6.22  
6.96  
7.78  
8.65  
9.60  
10.62  
—
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
A
B
967  
1011  
1046  
1082  
1119  
1158  
1198  
1238  
1279  
1321  
B
C
D
B
D
B
B
1003  
1041  
1079  
1119  
1160  
1202  
1244  
1287  
C
D
C
D
C
D
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)  
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
23  
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Table 10 — Fan Performance — 48PGF24 Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
652  
699  
746  
794  
842  
891  
940  
990  
1039  
1089  
Bhp  
1.90  
2.32  
2.79  
3.33  
3.93  
4.59  
5.32  
6.12  
7.00  
7.95  
Rpm  
719  
Bhp  
2.19  
2.63  
3.12  
3.68  
4.30  
4.98  
5.72  
6.54  
7.43  
8.40  
Rpm  
779  
Bhp  
2.47  
2.93  
3.44  
4.02  
4.65  
5.35  
6.11  
6.95  
7.85  
8.83  
Rpm  
833  
Bhp  
2.74  
3.22  
3.75  
4.34  
5.00  
5.71  
6.49  
7.35  
8.27  
9.26  
Rpm  
884  
Bhp  
3.01  
3.50  
4.05  
4.66  
5.33  
6.07  
6.87  
7.73  
8.67  
9.69  
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
A
B
763  
819  
A
B
872  
921  
A
A
807  
861  
911  
958  
A
C
851  
904  
952  
998  
897  
947  
994  
1038  
1079  
1121  
1163  
1207  
1251  
B
C
D
943  
990  
991  
1036  
1080  
1124  
1168  
1213  
B
C
1036  
1082  
1128  
1174  
C
D
C
D
1037  
1085  
1133  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
933  
Bhp  
3.27  
3.79  
4.35  
4.98  
5.67  
6.42  
7.23  
8.12  
9.07  
10.10  
Rpm  
979  
Bhp  
3.54  
4.07  
4.65  
5.29  
5.99  
6.76  
7.59  
8.49  
9.46  
10.51  
Rpm  
1023  
1054  
1087  
1122  
1158  
1195  
1234  
1273  
1314  
1355  
Bhp  
3.80  
4.35  
4.94  
5.60  
6.32  
7.10  
7.95  
8.87  
9.85  
10.91  
Rpm  
1066  
1095  
1127  
1160  
1195  
1231  
1269  
1308  
1347  
1387  
Bhp  
4.06  
4.62  
5.24  
5.91  
6.64  
7.44  
8.30  
9.23  
10.24  
11.31  
Rpm  
1108  
1135  
1165  
1197  
1231  
1267  
1303  
1341  
1379  
—
Bhp  
4.33  
4.90  
5.53  
6.22  
6.96  
7.78  
8.65  
9.60  
10.62  
—
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
A
B
967  
1011  
1046  
1082  
1119  
1158  
1198  
1238  
1279  
1321  
B
D
B
C
D
B
B
1003  
1041  
1079  
1119  
1160  
1202  
1244  
1287  
C
D
C
D
C
D
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v)  
(B) Mid-Low Range: 949-1206 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 11 — Fan Performance — 48PGD28 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
750  
Bhp  
2.28  
2.78  
3.34  
3.97  
4.68  
5.46  
6.32  
7.26  
8.28  
9.40  
10.61  
11.91  
13.32  
Rpm  
806  
Bhp  
2.62  
3.17  
3.78  
4.48  
5.25  
6.10  
7.04  
8.07  
9.20  
10.42  
11.74  
13.17  
—
Rpm  
854  
Bhp  
2.93  
3.50  
4.15  
4.88  
5.69  
6.59  
7.59  
8.67  
9.86  
11.15  
12.54  
—
Rpm  
898  
Bhp  
3.25  
3.84  
4.51  
5.26  
6.10  
7.04  
8.07  
9.19  
10.43  
11.76  
13.21  
—
Rpm  
943  
Bhp  
3.59  
4.18  
4.87  
5.64  
6.50  
7.46  
8.52  
9.68  
10.95  
12.33  
—
6,500  
7,000  
A
B
B
C
A
B
797  
853  
899  
941  
982  
A
B
B
7,500  
8,000  
8,500  
845  
900  
945  
985  
1024  
1067  
1112  
1157  
1203  
1249  
1296  
1342  
—
892  
948  
991  
1030  
1076  
1122  
1169  
1216  
1263  
1310  
1357  
—
939  
995  
1038  
1085  
1132  
1180  
1227  
1274  
1322  
—
C
D
9,000  
9,500  
986  
1042  
1090  
1137  
1184  
1232  
1279  
1326  
—
C
D
1033  
1079  
1126  
1172  
1219  
1265  
1311  
C
D
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
D
C
D
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
988  
Bhp  
3.97  
4.56  
5.25  
6.03  
6.91  
7.89  
8.97  
10.16  
11.45  
12.86  
—
Rpm  
1035  
1066  
1101  
1140  
1180  
1222  
1266  
1310  
1355  
—
Bhp  
4.40  
4.98  
5.66  
6.44  
7.33  
8.32  
9.42  
10.63  
11.95  
—
Rpm  
1082  
1109  
1141  
1176  
1214  
1255  
1296  
1340  
1384  
—
Bhp  
4.87  
5.43  
6.10  
6.88  
7.77  
8.77  
9.88  
11.10  
12.44  
—
Rpm  
1130  
1153  
1181  
1213  
1249  
1287  
1327  
1369  
—
Bhp  
5.39  
5.94  
6.59  
7.36  
8.24  
9.24  
10.36  
11.59  
—
Rpm  
1177  
1197  
1222  
1251  
1283  
1319  
1357  
1398  
—
Bhp  
5.95  
6.48  
7.12  
7.87  
8.74  
9.74  
10.86  
12.09  
—
6,500  
7,000  
7,500  
B
C
C
D
1024  
1063  
1104  
1146  
1190  
1235  
1280  
1326  
1372  
—
C
D
C
D
D
8,000  
8,500  
9,000  
9,500  
D
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 687-873 rpm, 5.75 bhp  
(B) Mid-Low Range: 805-1007 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 12 — Fan Performance — 48PGE28 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
775  
Bhp  
2.43  
2.98  
3.60  
4.31  
5.11  
6.00  
6.98  
8.08  
9.28  
10.60  
12.04  
13.60  
—
Rpm  
825  
Bhp  
2.75  
3.22  
3.89  
4.73  
5.56  
6.49  
7.53  
8.66  
9.91  
11.28  
12.76  
—
Rpm  
871  
Bhp  
3.05  
3.58  
4.28  
5.11  
5.97  
6.94  
8.00  
9.18  
10.46  
11.86  
13.39  
—
Rpm  
915  
Bhp  
3.37  
3.98  
4.69  
5.48  
6.37  
7.36  
8.45  
9.65  
10.97  
12.41  
—
Rpm  
959  
Bhp  
3.72  
4.34  
5.05  
5.86  
6.76  
7.77  
8.89  
10.12  
11.47  
12.93  
—
A
B
6,500  
7,000  
A
B
B
C
A
B
826  
875  
918  
959  
1000  
1043  
1088  
1134  
1181  
1229  
1278  
1327  
1376  
—
B
C
D
7,500  
8,000  
8,500  
878  
925  
966  
1005  
1052  
1100  
1148  
1198  
1247  
1297  
1347  
—
929  
975  
1015  
1064  
1114  
1164  
1214  
1265  
1316  
1367  
—
981  
1026  
1076  
1128  
1179  
1230  
1282  
1333  
—
C
D
9,000  
9,500  
1033  
1085  
1137  
1190  
1242  
1294  
1347  
—
C
D
D
C
D
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1004  
1041  
1081  
1124  
1168  
1214  
1260  
1308  
1356  
—
Bhp  
4.11  
4.73  
5.44  
6.26  
7.17  
8.20  
9.33  
10.58  
11.95  
—
Rpm  
1050  
1083  
1120  
1160  
1202  
1245  
1290  
1337  
1384  
—
Bhp  
4.55  
5.15  
5.86  
6.68  
7.60  
8.64  
9.79  
11.05  
12.44  
—
Rpm  
1098  
1126  
1159  
1196  
1235  
1277  
1320  
1365  
—
Bhp  
5.04  
5.62  
6.32  
7.13  
8.06  
9.10  
10.25  
11.53  
—
Rpm  
1145  
1170  
1199  
1233  
1269  
1309  
1351  
1394  
—
Bhp  
5.57  
6.14  
6.82  
7.62  
8.54  
9.58  
10.74  
12.03  
—
Rpm  
1192  
1214  
1240  
1270  
1304  
1341  
1381  
—
Bhp  
6.14  
6.70  
7.36  
8.15  
9.05  
10.09  
11.25  
—
6,500  
7,000  
7,500  
B
C
C
D
C
D
D
C
D
8,000  
8,500  
9,000  
9,500  
D
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 687-873 rpm, 5.75 bhp  
(B) Mid-Low Range: 805-1007 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
26  
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Table 13 — Fan Performance — 48PGF28 — Vertical Supply/Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
775  
Bhp  
2.43  
2.98  
3.60  
4.31  
5.11  
6.00  
6.98  
8.08  
9.28  
10.60  
12.04  
13.60  
—
Rpm  
825  
Bhp  
2.75  
3.22  
3.89  
4.73  
5.56  
6.49  
7.53  
8.66  
9.91  
11.28  
12.76  
—
Rpm  
871  
Bhp  
3.05  
3.58  
4.28  
5.11  
5.97  
6.94  
8.00  
9.18  
10.46  
11.86  
13.39  
—
Rpm  
915  
Bhp  
3.37  
3.98  
4.69  
5.48  
6.37  
7.36  
8.45  
9.65  
10.97  
12.41  
—
Rpm  
959  
Bhp  
3.72  
4.34  
5.05  
5.86  
6.76  
7.77  
8.89  
10.12  
11.47  
12.93  
—
A
B
6,500  
7,000  
A
B
B
C
A
B
826  
875  
918  
B
C
D
959  
1000  
1043  
1088  
1134  
1181  
1229  
1278  
1327  
1376  
—
7,500  
8,000  
8,500  
878  
925  
966  
1005  
1052  
1100  
1148  
1198  
1247  
1297  
1347  
—
929  
975  
1015  
1064  
1114  
1164  
1214  
1265  
1316  
1367  
—
981  
1026  
1076  
1128  
1179  
1230  
1282  
1333  
—
C
D
9,000  
9,500  
1033  
1085  
1137  
1190  
1242  
1294  
1347  
—
C
D
C
D
D
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1004  
1041  
1081  
1124  
1168  
1214  
1260  
1308  
1356  
—
Bhp  
4.11  
4.73  
5.44  
6.26  
7.17  
8.20  
9.33  
10.58  
11.95  
—
Rpm  
1050  
1083  
1120  
1160  
1202  
1245  
1290  
1337  
1384  
—
Bhp  
4.55  
5.15  
5.86  
6.68  
7.60  
8.64  
9.79  
11.05  
12.44  
—
Rpm  
1098  
1126  
1159  
1196  
1235  
1277  
1320  
1365  
—
Bhp  
5.04  
5.62  
6.32  
7.13  
8.06  
9.10  
10.25  
11.53  
—
Rpm  
1145  
1170  
1199  
1233  
1269  
1309  
1351  
1394  
—
Bhp  
5.57  
6.14  
6.82  
7.62  
8.54  
9.58  
10.74  
12.03  
—
Rpm  
1192  
1214  
1240  
1270  
1304  
1341  
1381  
—
Bhp  
6.14  
6.70  
7.36  
8.15  
9.05  
10.09  
11.25  
—
B
C
6,500  
7,000  
7,500  
C
D
C
D
D
C
D
8,000  
8,500  
9,000  
9,500  
D
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(A) Low Range: 687-873 rpm, 5.75 bhp  
(B) Mid-Low Range: 805-1007 rpm, 5.75 bhp  
(C) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(D) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 14 — Fan Performance — 48PGD20 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
862  
937  
Bhp  
2.65  
3.26  
3.58  
4.48  
5.52  
6.71  
8.07  
9.60  
—
Rpm  
917  
Bhp  
2.93  
3.56  
3.96  
4.89  
5.96  
7.18  
8.57  
—
Rpm  
969  
Bhp  
3.21  
3.53  
4.35  
5.31  
6.41  
7.66  
9.08  
—
Rpm  
1019  
1083  
1149  
1216  
1285  
1355  
—
Bhp  
3.17  
3.90  
4.75  
5.73  
6.86  
8.14  
—
Rpm  
1066  
1127  
1191  
1256  
1323  
1391  
—
Bhp  
3.52  
4.28  
5.16  
6.17  
7.32  
8.63  
—
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
F
F
F
988  
1036  
1105  
1175  
1247  
1319  
1392  
—
F
F
G
1013  
1089  
1166  
1243  
1320  
1398  
—
1060  
1133  
1207  
1282  
1356  
—
G
H
G
H
G
H
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1112  
1171  
1232  
1295  
1360  
—
Bhp  
3.88  
4.67  
5.57  
6.61  
7.80  
—
Rpm  
1156  
1212  
1271  
1333  
1396  
—
Bhp  
4.25  
5.06  
6.00  
7.06  
8.27  
—
Rpm  
1199  
1253  
1310  
1369  
—
Bhp  
4.63  
5.47  
6.43  
7.52  
—
Rpm  
1240  
1292  
1348  
—
Bhp  
5.02  
5.88  
6.87  
—
Rpm  
1280  
1331  
1384  
—
Bhp  
5.42  
6.30  
7.31  
—
G
H
G
H
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
F
G
F
G
H
G
H
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Bhp — Brake Horsepower Input to Fan  
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: Not Used  
(F) Mid-Low Range: 896-1227 rpm, 4.26 bhp (208/230 and 460-v), 873-1108 rpm, 5.75 bhp (575-v)  
(G) Mid-High Range: 1113-1414 rpm, 5.75 bhp  
(H) High Range: 1096-1339 rpm, 8.63 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 15 — Fan Performance — 48PGE20 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
875  
952  
Bhp  
2.74  
3.38  
3.74  
4.67  
5.75  
7.00  
8.41  
—
Rpm  
931  
Bhp  
3.04  
3.32  
4.15  
5.11  
6.23  
7.50  
8.95  
—
Rpm  
984  
1053  
1123  
1194  
1266  
1340  
—
Bhp  
3.34  
3.70  
4.56  
5.56  
6.71  
8.01  
—
Rpm  
1035  
1100  
1167  
1236  
1306  
1377  
—
Bhp  
3.33  
4.09  
4.98  
6.01  
7.19  
8.53  
—
Rpm  
1083  
1145  
1210  
1276  
1344  
—
Bhp  
3.69  
4.49  
5.41  
6.47  
7.68  
—
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
F
F
F
G
H
F
1003  
1077  
1151  
1226  
1302  
1378  
—
F
G
H
1029  
1106  
1184  
1262  
1341  
—-  
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—-  
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1130  
1189  
1251  
1315  
1381  
—
Bhp  
4.07  
4.90  
5.85  
6.94  
8.18  
—
Rpm  
1174  
1232  
1292  
1354  
—
Bhp  
4.45  
5.31  
6.29  
7.41  
—
Rpm  
1218  
1273  
1331  
1391  
—
Bhp  
4.84  
5.72  
6.74  
7.89  
—
Rpm  
1259  
1313  
1369  
—
Bhp  
5.23  
6.15  
7.19  
—
Rpm  
1300  
1352  
—
Bhp  
5.63  
6.58  
—
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
F
G
H
G
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: Not Used  
(F) Mid-Low Range: 896-1227 rpm, 4.26 bhp (208/230 and 460-v), 873-1108 rpm, 5.75 bhp (575-v)  
(G) Mid-High Range: 1113-1414 rpm, 5.75 bhp  
(H) High Range: 1096-1339 rpm, 8.63 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 16 — Fan Performance — 48PGF20 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
875  
952  
Bhp  
2.74  
3.38  
3.74  
4.67  
5.75  
7.00  
8.41  
—
Rpm  
931  
Bhp  
3.04  
3.32  
4.15  
5.11  
6.23  
7.50  
8.95  
—
Rpm  
984  
1053  
1123  
1194  
1266  
1340  
—
Bhp  
3.34  
3.70  
4.56  
5.56  
6.71  
8.01  
—
Rpm  
1035  
1100  
1167  
1236  
1306  
1377  
—
Bhp  
3.33  
4.09  
4.98  
6.01  
7.19  
8.53  
—
Rpm  
1083  
1145  
1210  
1276  
1344  
—
Bhp  
3.69  
4.49  
5.41  
6.47  
7.68  
—
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
F
F
F
G
H
F
1003  
1077  
1151  
1226  
1302  
1378  
—
F
G
H
1029  
1106  
1184  
1262  
1341  
—
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1130  
1189  
1251  
1315  
1381  
—
Bhp  
4.07  
4.90  
5.85  
6.94  
8.18  
—
Rpm  
1174  
1232  
1292  
1354  
—
Bhp  
4.45  
5.31  
6.29  
7.41  
—
Rpm  
1218  
1273  
1331  
1391  
—
Bhp  
4.84  
5.72  
6.74  
7.89  
—
Rpm  
1259  
1313  
1369  
—
Bhp  
5.23  
6.15  
7.19  
—
Rpm  
1300  
1352  
—
Bhp  
5.63  
6.58  
—
F
5000  
5500  
6000  
6500  
7000  
7500  
8000  
8500  
9000  
G
G
H
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: Not Used  
(F) Mid-Low Range: 896-1227 rpm, 4.26 bhp (208/230 and 460-v), 873-1108 rpm, 5.75 bhp (575-v)  
(G) Mid-High Range: 1113-1414 rpm, 5.75 bhp  
(H) High Range: 1096-1339 rpm, 8.63 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 17 — Fan Performance — 48PGD24 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
937  
Bhp  
3.26  
3.58  
4.48  
5.52  
6.71  
8.07  
9.60  
—
Rpm  
988  
1060  
1133  
1207  
1282  
1356  
—
Bhp  
3.56  
3.96  
4.89  
5.96  
7.18  
8.57  
—
Rpm  
1036  
1105  
1175  
1247  
1319  
1392  
—
Bhp  
3.53  
4.35  
5.31  
6.41  
7.66  
9.08  
—
Rpm  
1083  
1149  
1216  
1285  
1355  
—
Bhp  
3.90  
4.75  
5.73  
6.86  
8.14  
—
Rpm  
1127  
1191  
1256  
1323  
1391  
—
Bhp  
4.28  
5.16  
6.17  
7.32  
8.63  
—
F
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
F
F
G
H
G
H
F
1013  
1089  
1166  
1243  
1320  
1398  
—
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1171  
1232  
1295  
1360  
—
Bhp  
4.67  
5.57  
6.61  
7.80  
—
Rpm  
1212  
1271  
1333  
1396  
—
Bhp  
5.06  
6.00  
7.06  
8.27  
—
Rpm  
1253  
1310  
1369  
—
Bhp  
5.47  
6.43  
7.52  
—
Rpm  
1292  
1348  
—
Bhp  
5.88  
6.87  
—
Rpm  
1331  
1384  
—
Bhp  
6.30  
7.31  
—
G
H
G
H
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: Not Used  
(F) Mid-Low Range: 896-1227 rpm, 4.26 bhp (208/230 and 460-v), 873-1108 rpm, 5.75 bhp (575-v)  
(G) Mid-High Range: 1113-1414 rpm, 5.75 bhp  
(H) High Range: 1096-1339 rpm, 8.63 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
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Table 18 — Fan Performance — 48PGE24 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
952  
1029  
1106  
1184  
1262  
1341  
—
Bhp  
3.38  
3.74  
4.67  
5.75  
7.00  
8.41  
—
Rpm  
1003  
1077  
1151  
1226  
1302  
1378  
—
Bhp  
3.32  
4.15  
5.11  
6.23  
7.50  
8.95  
—
Rpm  
1053  
1123  
1194  
1266  
1340  
—
Bhp  
3.70  
4.56  
5.56  
6.71  
8.01  
—
Rpm  
1100  
1167  
1236  
1306  
1377  
—
Bhp  
4.09  
4.98  
6.01  
7.19  
8.53  
—
Rpm  
1145  
1210  
1276  
1344  
—
Bhp  
4.49  
5.41  
6.47  
7.68  
—
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
F
G
H
F
F
F
G
H
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1189  
1251  
1315  
1381  
—
Bhp  
4.90  
5.85  
6.94  
8.18  
—
Rpm  
1232  
1292  
1354  
—
Bhp  
5.31  
6.29  
7.41  
—
Rpm  
1273  
1331  
1391  
—
Bhp  
5.72  
6.74  
7.89  
—
Rpm  
1313  
1369  
—
Bhp  
6.15  
7.19  
—
Rpm  
1352  
—
Bhp  
6.58  
—
G
H
G
H
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
G
H
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: Not Used  
(F) Mid-Low Range: 896-1227 rpm, 4.26 bhp (208/230 and 460-v), 873-1108 rpm, 5.75 bhp (575-v)  
(G) Mid-High Range: 1113-1414 rpm, 5.75 bhp  
(H) High Range: 1096-1339 rpm, 8.63 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
32  
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Table 19 — Fan Performance — 48PGF24 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
952  
1029  
1106  
1184  
1262  
1341  
—
Bhp  
3.38  
3.74  
4.67  
5.75  
7.00  
8.41  
—
Rpm  
1003  
1077  
1151  
1226  
1302  
1378  
—
Bhp  
3.32  
4.15  
5.11  
6.23  
7.50  
8.95  
—
Rpm  
1053  
1123  
1194  
1266  
1340  
—
Bhp  
3.70  
4.56  
5.56  
6.71  
8.01  
—
Rpm  
1100  
1167  
1236  
1306  
1377  
—
Bhp  
4.09  
4.98  
6.01  
7.19  
8.53  
—
Rpm  
1145  
1210  
1276  
1344  
—
Bhp  
4.49  
5.41  
6.47  
7.68  
—
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
F
G
H
F
F
F
G
H
G
H
G
H
G
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1189  
1251  
1315  
1381  
—
Bhp  
4.90  
5.85  
6.94  
8.18  
—
Rpm  
1232  
1292  
1354  
—
Bhp  
5.31  
6.29  
7.41  
—
Rpm  
1273  
1331  
1391  
—
Bhp  
5.72  
6.74  
7.89  
—
Rpm  
1313  
1369  
—
Bhp  
6.15  
7.19  
—
Rpm  
1352  
—
Bhp  
6.58  
—
G
H
G
H
5,500  
6,000  
6,500  
7,000  
7,500  
8,000  
8,500  
9,000  
9,500  
10,000  
G
H
H
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: Not Used  
(F) Mid-Low Range: 896-1227 rpm, 4.26 bhp (208/230 and 460-v), 873-1108 rpm, 5.75 bhp (575-v)  
(G) Mid-High Range: 1113-1414 rpm, 5.75 bhp  
(H) High Range: 1096-1339 rpm, 8.63 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
33  
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Table 20 — Fan Performance — 48PGD28 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
786  
Bhp  
2.50  
3.09  
3.77  
4.55  
5.42  
6.41  
7.51  
8.74  
10.09  
11.58  
13.20  
—
Rpm  
819  
Bhp  
2.70  
3.30  
3.99  
4.77  
5.65  
6.65  
7.76  
8.99  
10.35  
11.85  
13.48  
—
Rpm  
857  
Bhp  
2.96  
3.55  
4.24  
5.03  
5.92  
6.92  
8.04  
9.28  
10.64  
12.15  
13.79  
—
Rpm  
899  
Bhp  
3.25  
3.85  
4.54  
5.33  
6.22  
7.23  
8.35  
9.59  
10.96  
12.47  
—
Rpm  
943  
Bhp  
3.59  
4.19  
4.88  
5.67  
6.56  
7.57  
8.69  
9.93  
11.31  
12.82  
—
E
6,500  
7,000  
E
E
F
F
F
842  
871  
905  
943  
983  
F
7,500  
8,000  
8,500  
898  
925  
955  
989  
1026  
1070  
1117  
1165  
1215  
1266  
1318  
1370  
—
F
955  
979  
1007  
1059  
1113  
1167  
1221  
1276  
1332  
1388  
—
1037  
1087  
1138  
1190  
1243  
1296  
1350  
—
G
H
1012  
1069  
1127  
1184  
1242  
1299  
1357  
—
1034  
1090  
1146  
1202  
1258  
1315  
1372  
—
G
H
G
H
G
H
9,000  
9,500  
G
H
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
988  
Bhp  
3.97  
4.57  
5.25  
6.04  
6.94  
7.94  
9.07  
10.31  
11.69  
13.20  
—
Rpm  
1035  
1066  
1102  
1140  
1181  
1225  
1270  
1316  
1364  
—
Bhp  
4.39  
4.98  
5.66  
6.45  
7.34  
8.35  
9.47  
10.72  
12.10  
—
Rpm  
1082  
1109  
1141  
1176  
1215  
1256  
1298  
1343  
1389  
—
Bhp  
4.87  
5.43  
6.11  
6.89  
7.78  
8.79  
9.91  
11.16  
12.54  
—
Rpm  
1129  
1153  
1181  
1213  
1249  
1287  
1328  
1370  
—
Bhp  
5.39  
5.93  
6.59  
7.36  
8.25  
9.25  
10.37  
11.62  
—
Rpm  
1177  
1197  
1221  
1250  
1283  
1319  
1358  
1399  
—
Bhp  
5.95  
6.48  
7.11  
7.87  
8.74  
9.74  
10.87  
12.11  
—
F
6,500  
7,000  
7,500  
G
H
1024  
1063  
1105  
1149  
1194  
1242  
1290  
1340  
1391  
—
G
H
G
H
H
G
8,000  
8,500  
9,000  
9,500  
H
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: 687-873 rpm, 5.75 bhp  
(F) Mid-Low Range: 805-1007 rpm, 5.75 bhp  
(G) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(H) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
34  
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Table 21 — Fan Performance — 48PGE28 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
799  
Bhp  
2.58  
3.19  
3.89  
4.69  
5.60  
6.62  
7.75  
9.01  
10.40  
11.93  
13.61  
—
Rpm  
833  
887  
941  
996  
1052  
1108  
1165  
1222  
1279  
1337  
—
Bhp  
2.79  
3.41  
4.12  
4.93  
5.85  
6.87  
8.02  
9.29  
10.69  
12.23  
—
Rpm  
872  
Bhp  
3.05  
3.67  
4.39  
5.20  
6.12  
7.16  
8.31  
9.59  
11.00  
12.55  
—
Rpm  
914  
Bhp  
3.36  
3.98  
4.69  
5.51  
6.44  
7.47  
8.63  
9.92  
11.34  
12.89  
—
Rpm  
958  
Bhp  
3.71  
4.33  
5.04  
5.86  
6.78  
7.82  
8.99  
10.28  
11.70  
13.26  
—
6,500  
7,000  
E
F
E
E
F
F
856  
921  
958  
999  
F
7,500  
8,000  
8,500  
913  
972  
1006  
1055  
1106  
1158  
1211  
1265  
1319  
1374  
—
1042  
F
971  
1024  
1078  
1132  
1187  
1243  
1299  
1355  
—
G 1088  
1136  
1029  
1087  
1145  
1203  
1261  
1320  
1378  
—
G
H
G
H
G
H
G
H
9,000  
9,500  
1185  
1236  
1288  
1341  
1394  
—
H
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1005  
1041  
1080  
1122  
1167  
1214  
1262  
1312  
1363  
—
Bhp  
4.12  
4.72  
5.43  
6.24  
7.16  
8.21  
9.37  
10.66  
12.09  
—
Rpm  
1052  
1084  
1119  
1158  
1200  
1244  
1290  
1338  
1387  
—
Bhp  
4.57  
5.16  
5.86  
6.66  
7.58  
8.62  
9.78  
11.08  
12.51  
—
Rpm  
1100  
1128  
1160  
1195  
1234  
1275  
1319  
1365  
—
Bhp  
5.06  
5.64  
6.33  
7.13  
8.04  
9.07  
10.23  
11.52  
—
Rpm  
1148  
1172  
1201  
1233  
1269  
1308  
1349  
1392  
—
Bhp  
5.60  
6.17  
6.84  
7.63  
8.53  
9.56  
10.71  
12.00  
—
Rpm  
1195  
1217  
1242  
1272  
1304  
1340  
1379  
—
Bhp  
6.17  
6.74  
7.40  
8.17  
9.06  
10.08  
11.23  
—
F
6,500  
7,000  
7,500  
G
H
G
H
H
G
H
G
8,000  
8,500  
9,000  
9,500  
H
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: 687-873 rpm, 5.75 bhp  
(F) Mid-Low Range: 805-1007 rpm, 5.75 bhp  
(G) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(H) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See page 36 for general fan performance notes.  
35  
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Table 22 — Fan Performance — 48PGF28 — Horizontal Supply and Return Units  
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
AIRFLOW  
(Cfm)  
0.2  
0.4  
0.6  
0.8  
1.0  
Rpm  
799  
Bhp  
2.58  
3.19  
3.89  
4.69  
5.60  
6.62  
7.75  
9.01  
10.40  
11.93  
13.61  
—
Rpm  
833  
887  
941  
996  
1052  
1108  
1165  
1222  
1279  
1337  
—
Bhp  
2.79  
3.41  
4.12  
4.93  
5.85  
6.87  
8.02  
9.29  
10.69  
12.23  
—
Rpm  
872  
Bhp  
3.05  
3.67  
4.39  
5.20  
6.12  
7.16  
8.31  
9.59  
11.00  
12.55  
—
Rpm  
914  
Bhp  
3.36  
3.98  
4.69  
5.51  
6.44  
7.47  
8.63  
9.92  
11.34  
12.89  
—
Rpm  
958  
Bhp  
3.71  
4.33  
5.04  
5.86  
6.78  
7.82  
8.99  
10.28  
11.70  
13.26  
—
6,500  
7,000  
7,500  
E
F
E
F
E
F
F
856  
921  
F
958  
999  
913  
972  
1006  
1055  
1106  
1158  
1211  
1265  
1319  
1374  
—
1042  
1088  
1136  
1185  
1236  
1288  
1341  
1394  
—
8,000  
971  
1024  
1078  
1132  
1187  
1243  
1299  
1355  
—
G
8,500  
9,000  
9,500  
1029  
1087  
1145  
1203  
1261  
1320  
1378  
—
G
H
G
H
G
H
G
H
H
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)  
1.6  
AIRFLOW  
(Cfm)  
1.2  
1.4  
1.8  
2.0  
Rpm  
1005  
1041  
1080  
1122  
1167  
1214  
1262  
1312  
1363  
—
Bhp  
4.12  
4.72  
5.43  
6.24  
7.16  
8.21  
9.37  
10.66  
12.09  
—
Rpm  
1052  
1084  
1119  
1158  
1200  
1244  
1290  
1338  
1387  
—
Bhp  
4.57  
5.16  
5.86  
6.66  
7.58  
8.62  
9.78  
11.08  
12.51  
—
Rpm  
1100  
1128  
1160  
1195  
1234  
1275  
1319  
1365  
—
Bhp  
5.06  
5.64  
6.33  
7.13  
8.04  
9.07  
10.23  
11.52  
—
Rpm  
1148  
1172  
1201  
1233  
1269  
1308  
1349  
1392  
—
Bhp  
5.60  
6.17  
6.84  
7.63  
8.53  
9.56  
10.71  
12.00  
—
Rpm  
1195  
1217  
1242  
1272  
1304  
1340  
1379  
—
Bhp  
6.17  
6.74  
7.40  
8.17  
9.06  
10.08  
11.23  
—
6,500  
7,000  
7,500  
F
G
H
G
H
G
H
G
8,000  
8,500  
9,000  
H
H
9,500  
10,000  
10,500  
11,000  
11,500  
12,000  
12,500  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
Brake Horsepower Input to Fan  
Bhp  
—
Boldface indicates field-supplied motor/drive required.  
NOTES:  
1. Motor drive ranges:  
(E) Low Range: 687-873 rpm, 5.75 bhp  
(F) Mid-Low Range: 805-1007 rpm, 5.75 bhp  
(G) Mid-High Range: 941-1176 rpm, 8.63 bhp  
(H) High Range: 1014-1297 rpm, 11.50 bhp  
All other rpms require field-supplied motor or drive.  
2. See below for general fan performance notes.  
GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES  
1. Static pressure losses (i.e., economizer, electric heat, etc.) must be added  
to external static pressure before entering Fan Performance table.  
2. Interpolation is permissible. Do not extrapolate.  
5. Use of a field-supplied motor may affect wire size. Recalculate the unit  
power supply MCA and MOCP if required. Contact the local Carrier repre-  
sentative for details.  
3. Fan performance is based on wet coils, clean filters, and casing losses.  
See Accessory/FIOP Static Pressure information on page 39.  
6. Use the following formula to calculate Input Watts:  
Input Watts = Bhp x (746/motor eff.)  
4. Extensive motor and drive testing on these units ensures that the full  
horsepower range of the motor can be utilized with confidence. Using the  
fan motors up to the bhp rating shown will not result in nuisance tripping or  
premature motor failure. Unit warranty will not be affected.  
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Table 23 — Power Exhaust Fan Performance — 48PG20-28  
LOW SPEED  
230,460,575V  
Bhp Watts ESP  
MEDIUM SPEED  
230,460,575V  
Bhp Watts ESP Bhp Watts ESP  
HIGH SPEED  
230,460,575V  
Bhp Watts ESP Bhp Watts  
AIRFLOW  
(Cfm)  
208 V  
Bhp Watts ESP  
208 V  
208 V  
ESP  
3250  
3350  
3450  
3550  
3650  
3750  
3850  
3950  
4050  
4250  
4450  
4650  
4850  
5050  
5250  
5450  
5650  
5850  
0.32  
0.23  
0.17  
0.13  
0.09  
—
1.41  
1.44  
1.46  
1.47  
1.49  
—
1580  
1610  
1635  
1645  
1665  
—
0.70  
0.63  
0.59  
0.56  
0.53  
0.51  
0.48  
0.45  
0.40  
—
1.49  
1.52  
1.55  
1.56  
1.58  
1.60  
1.62  
1.64  
1.67  
—
1670  
1700  
1730  
1745  
1765  
1790  
1810  
1835  
1865  
—
—
0.60  
0.55  
0.49  
0.43  
0.39  
0.33  
0.27  
0.22  
0.17  
0.00  
—
—
1.51  
1.54  
1.56  
1.59  
1.62  
1.64  
1.66  
1.68  
1.74  
1.79  
—
—
1690  
1720  
1750  
1780  
1815  
1835  
1860  
1885  
1945  
2005  
—
—
—
—
—
—
—
—
—
—
—
—
—
0.82  
0.78  
0.73  
0.68  
0.64  
0.59  
0.54  
0.49  
0.40  
0.30  
0.22  
0.16  
0.12  
—
1.62  
1.64  
1.67  
1.70  
1.72  
1.74  
1.76  
1.79  
1.84  
1.89  
1.94  
1.98  
2.02  
—
1810  
1840  
1870  
1900  
1930  
1950  
1975  
2000  
2060  
2115  
2170  
2215  
2260  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.60  
0.56  
0.51  
0.41  
0.31  
0.20  
0.11  
0.04  
—
1.85  
1.87  
1.89  
1.92  
1.97  
2.04  
2.09  
2.13  
—
2070  
2095  
2120  
2145  
2205  
2280  
2335  
2385  
—
0.73  
0.69  
0.65  
0.56  
0.47  
0.37  
0.30  
0.23  
0.17  
0.12  
0.07  
0.04  
1.99  
2.01  
2.04  
2.06  
2.12  
2.19  
2.24  
2.28  
2.33  
2.38  
2.40  
2.42  
2230  
2255  
2280  
2310  
2370  
2450  
2505  
2555  
2610  
2665  
2690  
2710  
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND  
ESP — External Static Pressure  
Table 24 — Operation Air Quantity Limits  
HEATING  
(NAT. GAS,  
VERTICAL)  
Minimum Cfm  
5522  
HEATING  
(NAT. GAS,  
HEATING  
(PROPANE,  
VERTICAL)  
Minimum Cfm  
5522  
HEATING  
(PROPANE,  
HORIZONTAL)  
Minimum Cfm  
4920  
COOLING  
48PG  
GAS HEAT  
HORIZONTAL)  
Minimum Cfm  
5522  
Minimum Cfm  
Maximum Cfm  
High Heat (8 Cell)  
Medium Heat (8 Cell)  
Low Heat (5 Cell)  
High Heat (8 Cell)  
Medium Heat (8 Cell)  
Low Heat (5 Cell)  
High Heat (8 Cell)  
Medium Heat (8 Cell)  
Low Heat (5 Cell)  
20  
24  
28  
5000  
9,000  
4977  
4218  
5522  
4977  
4218  
5522  
4977  
4218  
4977  
4218  
5522  
4977  
4218  
5470*  
4977*  
4218  
4480  
4218  
5522  
4480  
4218  
5522  
4480  
4218  
4480  
3796  
4920  
4480  
5500  
6500  
10,000  
12,000  
3796  
4920*  
4480*  
3796  
*7000 cfm minimum recommended above 1.0 in. wg external static pressure.  
Table 25 — Evaporator Fan Motor Specifications  
48PG  
DRIVE  
ORIENTATION  
MOTOR P/N NOMINAL HP  
VOLTAGE  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
MAX WATTS  
3698  
3698  
3698  
4900  
4900  
4900  
4900  
4900  
7267  
7267  
7267  
7267  
9582  
9582  
9582  
9582  
N/A  
EFFICIENCY % MAX BHP MAX BkW  
MAX AMPS  
10.6  
9.6  
HD60FK651  
HD60FK651  
HD60FK651  
HD60FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD62FK652  
HD62FK652  
HD62FK652  
HD62FK576  
HD64FK651  
HD64FK651  
HD64FK651  
HD64FK575  
N/A  
3.7  
3.7  
3.7  
5
5
5
85.8  
85.8  
85.8  
87.5  
87.5  
87.5  
87.5  
87.5  
88.5  
88.5  
88.5  
88.5  
89.5  
89.5  
89.5  
89.5  
N/A  
4.25  
4.25  
4.25  
5.75  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
8.63  
8.63  
11.5  
11.5  
11.5  
11.5  
N/A  
3.17  
3.17  
3.17  
4.29  
4.29  
4.29  
4.29  
4.29  
6.43  
6.43  
6.43  
6.43  
8.58  
8.58  
8.58  
8.58  
N/A  
Low  
Vertical  
4.8  
6.1  
16.7  
15.2  
7.6  
6.1  
24.2  
22  
11  
9
Mid-Low  
Mid-High  
High  
Vertical  
Vertical  
5
5
7.5  
7.5  
7.5  
7.5  
10  
10  
10  
10  
N/A  
N/A  
N/A  
N/A  
3.7  
3.7  
3.7  
5
30.8  
28  
14  
Vertical  
11  
20  
N/A  
N/A  
N/A  
N/A  
10.6  
9.6  
4.8  
6.1  
16.7  
15.2  
7.6  
6.1  
24.2  
22  
11  
9
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
Low  
Horizontal  
Horizontal  
Horizontal  
Horizontal  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
HD60FK651  
HD60FK651  
HD60FK651  
HD60FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD62FK652  
HD62FK652  
HD62FK652  
HD62FK576  
3698  
3698  
3698  
4900  
4900  
4900  
4900  
4900  
7267  
7267  
7267  
7267  
85.8  
85.8  
85.8  
87.5  
87.5  
87.5  
87.5  
87.5  
88.5  
88.5  
88.5  
88.5  
4.25  
4.25  
4.25  
5.75  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
8.63  
8.63  
3.17  
3.17  
3.17  
4.29  
4.29  
4.29  
4.29  
4.29  
6.43  
6.43  
6.43  
6.43  
Mid-Low  
Mid-High  
High  
5
5
5
5
7.5  
7.5  
7.5  
7.5  
37  
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Table 25 — Evaporator Fan Motor Specifications (cont)  
48PG  
DRIVE  
ORIENTATION  
MOTOR P/N NOMINAL HP  
VOLTAGE  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
208  
230  
460  
575  
MAX WATTS  
3698  
3698  
3698  
4900  
4900  
4900  
4900  
4900  
7267  
7267  
7267  
7267  
9582  
9582  
9582  
9582  
N/A  
EFFICIENCY % MAX BHP MAX BkW  
MAX AMPS  
10.6  
9.6  
HD60FK651  
HD60FK651  
HD60FK651  
HD60FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD62FK652  
HD62FK652  
HD62FK652  
HD62FK576  
HD64FK651  
HD64FK651  
HD64FK651  
HD64FK575  
N/A  
3.7  
3.7  
3.7  
5
5
5
85.8  
85.8  
85.8  
87.5  
87.5  
87.5  
87.5  
87.5  
88.5  
88.5  
88.5  
88.5  
89.5  
89.5  
89.5  
89.5  
N/A  
4.25  
4.25  
4.25  
5.75  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
8.63  
8.63  
11.5  
11.5  
11.5  
11.5  
N/A  
3.17  
3.17  
3.17  
4.29  
4.29  
4.29  
4.29  
4.29  
6.43  
6.43  
6.43  
6.43  
8.58  
8.58  
8.58  
8.58  
N/A  
Low  
Vertical  
4.8  
6.1  
16.7  
15.2  
7.6  
6.1  
24.2  
22  
11  
9
Mid-Low  
Mid-High  
High  
Vertical  
Vertical  
5
5
7.5  
7.5  
7.5  
7.5  
10  
10  
10  
10  
N/A  
N/A  
N/A  
N/A  
3.7  
3.7  
3.7  
5
30.8  
28  
14  
Vertical  
11  
24  
N/A  
N/A  
N/A  
N/A  
10.6  
9.6  
4.8  
6.1  
16.7  
15.2  
7.6  
6.1  
24.2  
22  
11  
9
16.7  
15.2  
7.6  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
Low  
Horizontal  
Horizontal  
Horizontal  
Horizontal  
Vertical  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
HD60FK651  
HD60FK651  
HD60FK651  
HD60FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD62FK652  
HD62FK652  
HD62FK652  
HD62FK576  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD62FK652  
HD62FK652  
HD62FK652  
HD62FK576  
HD64FK651  
HD64FK651  
HD64FK651  
HD64FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD60FK653  
HD60FK653  
HD60FK653  
HD60FK575  
HD62FK652  
HD62FK652  
HD62FK652  
HD62FK576  
HD64FK651  
HD64FK651  
HD64FK651  
HD64FK575  
3698  
3698  
3698  
4900  
4900  
4900  
4900  
4900  
7267  
7267  
7267  
7267  
4900  
4900  
4900  
4900  
4900  
4900  
4900  
4900  
7267  
7267  
7267  
7267  
9582  
9582  
9582  
9582  
4900  
4900  
4900  
4900  
4900  
4900  
4900  
4900  
7267  
7267  
7267  
7267  
9582  
9582  
9582  
9582  
85.8  
85.8  
85.8  
87.5  
87.5  
87.5  
87.5  
87.5  
88.5  
88.5  
88.5  
88.5  
87.5  
87.5  
87.5  
87.5  
87.5  
87.5  
87.5  
87.5  
88.5  
88.5  
88.5  
88.5  
89.5  
89.5  
89.5  
89.5  
87.5  
87.5  
87.5  
87.5  
87.5  
87.5  
87.5  
87.5  
88.5  
88.5  
88.5  
88.5  
89.5  
89.5  
89.5  
89.5  
4.25  
4.25  
4.25  
5.75  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
8.63  
8.63  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
8.63  
8.63  
11.5  
11.5  
11.5  
11.5  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
5.75  
8.63  
8.63  
8.63  
8.63  
11.5  
11.5  
11.5  
11.5  
3.17  
3.17  
3.17  
4.29  
4.29  
4.29  
4.29  
4.29  
6.43  
6.43  
6.43  
6.43  
4.29  
4.29  
4.29  
4.29  
4.29  
4.29  
4.29  
4.29  
6.43  
6.43  
6.43  
6.43  
8.58  
8.58  
8.58  
8.58  
4.29  
4.29  
4.29  
4.29  
4.29  
4.29  
4.29  
4.29  
6.43  
6.43  
6.43  
6.43  
8.58  
8.58  
8.58  
8.58  
Mid-Low  
Mid-High  
High  
5
5
5
5
7.5  
7.5  
7.5  
7.5  
5
5
5
5
5
5
5
5
Low  
6.1  
16.7  
15.2  
7.6  
6.1  
24.2  
22  
11  
9
30.8  
28  
14  
Mid-Low  
Mid-High  
High  
Vertical  
7.5  
7.5  
7.5  
7.5  
10  
10  
10  
10  
5
5
5
5
5
Vertical  
Vertical  
11  
28  
16.7  
15.2  
7.6  
Low  
Horizontal  
Horizontal  
Horizontal  
Horizontal  
6.1  
16.7  
15.2  
7.6  
6.1  
24.2  
22  
11  
9
30.8  
28  
14  
5
5
5
Mid-Low  
Mid-High  
High  
7.5  
7.5  
7.5  
7.5  
10  
10  
10  
10  
11  
NOTES:  
1. Extensive motor and electrical testing ensures that the motors can be uti-  
lized with confidence up to the maximum applied bhp, watts, and amps.  
Using the fan motor up to the maximum ratings shown will not result in nui-  
sance tripping or premature motor failure. Unit warranty will not be affected.  
2. All indoor-fan motors 5 hp and larger meet the minimum efficiency require-  
ments as established by the Energy Policy Act of 1992 (EPACT) effective  
October 24, 1997.  
38  
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Table 26 — Accessory/FIOP Static Pressure (in. wg)* — 48PG20-28  
CFM  
COMPONENT  
4,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000  
Economizer  
0.02  
0.03  
0.04  
0.05  
0.06  
0.07  
0.08  
0.09  
0.10  
CFM  
8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000  
0.11 0.12 0.13 0.15 0.16 0.17 0.19 0.20  
COMPONENT  
Economizer  
LEGEND  
Factory-Installed Option  
FIOP  
—
*The static pressure must be added to the external static pressure. The sum and the evaporator  
entering-air cfm should then be used in conjunction with the Fan Performance tables to deter-  
mine blower rpm and watts.  
Table 27 — Fan Rpm at Motor Pulley Settings*  
MOTOR PULLEY TURNS OPEN  
UNIT  
DRIVE  
1
48PG  
0
/
2
1
11/2  
749  
1013  
1000  
1085  
n/a  
2
21/2  
3
31/2  
4
854  
41/2  
876  
1142  
1117  
1226  
n/a  
5
897  
1163  
1137  
1250  
n/a  
51/2  
918  
1185  
1156  
1273  
n/a  
6
939  
1206  
1176  
1297  
n/a  
Low  
Mid-Low  
Mid-High  
High  
685  
949  
941  
1014  
n/a  
706  
970  
961  
1038  
n/a  
727  
992  
980  
1061  
n/a  
770  
791  
812  
833  
1035  
1019  
1108  
n/a  
1056  
1039  
1132  
n/a  
1078  
1059  
1156  
n/a  
1099  
1078  
1179  
n/a  
1120  
1098  
1203  
n/a  
20 and 24  
(230 and 460 volt)  
Low  
Mid-Low  
Mid-High  
High  
896  
1113  
1096  
751  
949  
941  
1014  
n/a  
924  
951  
1163  
1137  
785  
992  
980  
1061  
n/a  
979  
1006  
1213  
1177  
819  
1035  
1019  
1108  
n/a  
1034  
1238  
1197  
836  
1056  
1039  
1132  
n/a  
1062  
1264  
1218  
853  
1078  
1059  
1156  
n/a  
1089  
1289  
1238  
869  
1099  
1078  
1179  
n/a  
1117  
1314  
1258  
886  
1120  
1098  
1203  
n/a  
1144  
1339  
1278  
903  
1142  
1117  
1226  
n/a  
1172  
1364  
1299  
920  
1163  
1137  
1250  
n/a  
1199  
1389  
1319  
937  
1185  
1156  
1273  
n/a  
1227  
1414  
1339  
954  
1206  
1176  
1297  
n/a  
1138  
1116  
768  
970  
961  
1188  
1157  
802  
1013  
1000  
1085  
n/a  
Low  
Mid-Low  
Mid-High  
High  
1038  
n/a  
20 and 24  
(575 volt)  
Low  
Mid-Low  
Mid-High  
High  
873  
1113  
1096  
687  
805  
941  
1014  
687  
805  
941  
1014  
893  
912  
1163  
1137  
718  
839  
980  
1061  
718  
839  
980  
1061  
932  
951  
971  
991  
1010  
1289  
1238  
796  
1030  
1314  
1258  
811  
1049  
1339  
1278  
827  
1069  
1364  
1299  
842  
1088  
1389  
1319  
858  
1108  
1414  
1339  
873  
1007  
1176  
1297  
873  
1138  
1116  
703  
822  
961  
1038  
703  
822  
961  
1038  
1188  
1157  
734  
1213  
1177  
749  
1238  
1197  
765  
1264  
1218  
780  
Low  
Mid-Low  
Mid-High  
High  
856  
872  
889  
906  
923  
940  
957  
973  
990  
1000  
1085  
734  
856  
1000  
1085  
1019  
1108  
749  
872  
1019  
1108  
1039  
1132  
765  
889  
1039  
1132  
1059  
1156  
780  
906  
1059  
1156  
1078  
1179  
796  
923  
1078  
1179  
1098  
1203  
811  
940  
1098  
1203  
1117  
1226  
827  
957  
1117  
1226  
1137  
1250  
842  
973  
1137  
1250  
1156  
1273  
858  
990  
1156  
1273  
28  
(all voltages)  
Low  
Mid-Low  
Mid-High  
High  
1007  
1176  
1297  
LEGEND  
*Approximate fan rpm shown.  
NOTE: Factory pulley speed setting is at 3 turns open.  
n/a — not available  
ECONOMI$ER IV CONTROLLER WIRING AND OPER-  
ATIONAL MODES — Determine the EconoMi$er IV control  
mode before set up of the control. Some modes of operation may  
require different sensors. Refer to Table 28. The EconoMi$er IV  
is supplied from the factory with a mixed-air temperature  
sensor and an outdoor air temperature sensor. This allows for  
operation of the EconoMi$er IV with outdoor air dry bulb  
changeover control. Additional accessories can be added to  
allow for different types of changeover control and operation  
of the EconoMi$er IV and unit.  
Outdoor Dry Bulb Changeover — The standard controller is  
shipped from the factory configured for outdoor dry bulb  
changeover control. The outdoor air and mixed-air temperature  
sensors are included as standard. For this control mode, the out-  
door temperature is compared to an adjustable set point selected  
on the control. If the outdoor-air temperature is above the set  
point, the EconoMi$er IV will adjust the outdoor-air dampers to  
minimum position. If the outdoor-air temperature is below the  
set point, the position of the outdoor-air dampers will be con-  
trolled to provided free cooling using outdoor air. When in this  
mode, the LED next to the free cooling set point potentiometer  
will be on. The changeover temperature set point is controlled  
by the free cooling set point potentiometer located on the con-  
trol. The scale on the potentiometer is A, B, C, and D. See  
Fig. 25 for the corresponding temperature changeover values.  
Optional EconoMi$er IV — See Fig. 23 for EconoMi$er  
IV component locations. The optional EconoMi$er IV comes  
from the factory fully wired and assembled. No field wiring or  
assembly is required for standard outdoor dry bulb changeover  
operation. Field wiring of accessory sensors is required for  
different operational modes.  
ECONOMI$ER IV STANDARD SENSORS  
Outdoor Air Temperature (OAT) Sensor — The outdoor air  
temperature sensor is a 10 to 20 mA device used to measure the  
outdoor-air temperature. The outdoor-air temperature is used to  
determine when the EconoMi$er IV can be used for free  
cooling. The sensor is factory-installed on the EconoMi$er IV  
in the outdoor airstream. See Fig. 24. The operating range of  
temperature measurement is 40 to 100 F.  
Mixed-Air Temperature (MAT) Sensor — The mixed-air  
temperature sensor is a 3 K thermistor located at the outlet of  
the indoor fan. See Fig. 24. This sensor is factory installed. The  
operating range of temperature measurement is 0° to 158 F.  
The temperature sensor is a short probe with blue wires  
running to it.  
Outdoor Air Lockout Sensor — The Economi$er IV is  
equipped with an ambient temperature lockout switch located  
in the outdoor airstream which is used to lock out the compres-  
sors below a 42 F ambient temperature.  
39  
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DAMPER  
ASSEMBLY  
WIRE  
HARNESS  
DAMPER  
ACTUATOR  
WIRE TIES  
PL7  
PL7  
OUTSIDE AIR  
ENTHALPY  
ECONOMIZER  
BLOCK OFF  
INDOOR AIR  
ENTHALPY  
Fig. 23 — EconoMi$er IV Component Locations (Exploded View)  
19  
LED ON  
18  
D
17  
LED ON  
LED OFF  
16  
15  
14  
C
LED ON  
LED OFF  
B
13  
12  
LED ON  
LED OFF  
MAT LOCATION  
A
11  
10  
9
LED OFF  
85 90  
95  
OAT LOCATION  
100  
50  
55 60  
70 75  
40 45  
65  
80  
DEGREES FAHRENHEIT  
Fig. 24 — Sensor Locations (OAT and MAT)  
Fig. 25 — Temperature Changeover Set Points  
Table 28 — EconoMi$er IV Sensor Usage  
ECONOMI$ER IV WITH OUTDOOR AIR  
ECONOMI$ER IV WITH SINGLE  
ENTHALPY SENSOR  
DRY BULB SENSOR  
Accessories Required  
APPLICATION  
Accessories Required  
CRTEMPSN002A00*  
Outdoor Air Dry Bulb  
Differential Dry Bulb  
Single Enthalpy  
None. The outdoor air dry bulb sensor is factory installed.  
CRTEMPSN002A00*  
(2) CRTEMPSN002A00*  
HH57AC078  
None. The single enthalpy sensor is factory installed.  
HH57AC078  
and  
CRENTDIF004A00*  
Differential Enthalpy  
CRENTDIF004A00*  
CO2 for DCV Control using a  
Wall-Mounted CO2 Sensor  
33ZCSENCO2  
33ZCSENCO2  
33ZCSENCO2†  
33ZCSENCO2†  
CO2 for DCV Control using a  
Duct-Mounted CO2 Sensor  
and  
CRCBDIOX005A00††  
and  
CRCBDIOX005A00††  
33ZCASPCO2**  
33ZCASPCO2**  
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be  
needed for installation.  
†33ZCSENCO2 is an accessory CO2 sensor.  
**33ZCASPCO2 is an accessory aspirator box required for duct-mounted applications.  
††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 and 33ZCASPCO2 accessories.  
40  
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Differential Dry Bulb Control — For differential dry bulb  
control the standard outdoor dry bulb sensor is used in conjunc-  
tion with an additional accessory dry bulb sensor (part number  
CRTEMPSN002A00). The accessory sensor must be mounted  
in the return airstream. Wiring is provided in the EconoMi$er  
IV wiring harness. See Fig. 26.  
In this mode of operation, the outdoor-air temperature is  
compared to the return-air temperature and the lower tempera-  
ture airstream is used for cooling. When using this mode of  
changeover control, turn the enthalpy set point potentiometer  
fully clockwise to the D setting.  
Outdoor Enthalpy Changeover — For enthalpy control, acces-  
sory enthalpy sensor (part number HH57AC078) is required.  
Replace the standard outdoor dry bulb temperature sensor with  
the accessory enthalpy sensor in the same mounting location.  
When the outdoor air enthalpy rises above the outdoor enthalpy  
changeover set point, the outdoor-air damper moves to its mini-  
mum position. The outdoor enthalpy changeover set point is set  
with the outdoor enthalpy set point potentiometer on the  
EconoMi$er IV controller. The set points are A, B, C, and D.  
See Fig. 27. The factory-installed 620-ohm jumper must be in  
place across terminals SR and + on the EconoMi$er IV control-  
ler. See Fig. 26.  
Differential Enthalpy Control — For differential enthalpy  
control, the EconoMi$er IV controller uses two enthalpy  
sensors (HH57AC078 and CRENTDIF004A00), one in the  
outside air and one in the return air duct. The EconoMi$er IV  
controller compares the outdoor air enthalpy to the return air  
enthalpy to determine EconoMi$er IV use. The controller  
selects the lower enthalpy air (return or outdoor) for cooling.  
For example, when the outdoor air has a lower enthalpy than  
the return air, the EconoMi$er IV opens to bring in outdoor air  
for free cooling.  
Replace the standard outside air dry bulb temperature  
sensor with the accessory enthalpy sensor in the same mount-  
ing location. Mount the return air enthalpy sensor in the return  
air duct. Wiring is provided in the EconoMi$er IV wiring  
harness. See Fig. 26. The outdoor enthalpy changeover set  
point is set with the outdoor enthalpy set point potentiometer  
on the EconoMi$er IV controller. When using this mode of  
changeover control, turn the enthalpy setpoint potentiometer  
fully clockwise to the D setting. See Fig. 28.  
Indoor Air Quality (IAQ) Sensor Input — The IAQ input  
can be used for demand control ventilation control based on the  
level of CO2 measured in the space or return air duct.  
Mount the optional IAQ sensor according to manufacturer  
specifications. The IAQ sensor should be wired to the AQ and  
AQ1 terminals of the controller. Adjust the DCV (demand  
controlled ventilation) potentiometers to correspond to the  
DCV voltage output of the indoor air quality sensor at the  
user-determined set point. See Fig. 29.  
If a separate field-supplied transformer is used to power the  
IAQ sensor, the sensor must not be grounded or the  
EconoMi$er IV control board will be damaged.  
Exhaust Set Point Adjustment — The exhaust set point will  
determine when the exhaust fan runs based on damper position  
(if accessory power exhaust is installed). The set point is modi-  
fied with the Exhaust Fan Set Point (EXH SET) potentiometer.  
See Fig. 28. The set point represents the damper position above  
which the exhaust fans will be turned on. When there is a call  
for exhaust, the EconoMi$er IV controller provides a 45 15  
second delay before exhaust fan activation to allow the damp-  
ers to open. This delay allows the damper to reach the appro-  
priate position to avoid unnecessary fan overload.  
Fig. 26 — EconoMi$er IV Wiring  
41  
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85  
90  
95 100 105 110  
(29) (32) (35) (38) (41) (43)  
CONTROL CONTROL POINT  
CURVE  
APPROX. °F (°C)  
AT 50% RH  
80  
(27)  
A
B
C
D
73 (23)  
70 (21)  
67 (19)  
63 (17)  
75  
(24)  
70  
(21)  
65  
(18)  
60  
(16)  
A
55  
(13)  
B
50  
(10)  
C
45  
(7)  
D
40  
(4)  
35  
(2)  
A
B
C
D
HIGH LIMIT  
CURVE  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95 100 105 110  
(2)  
(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)  
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)  
Fig. 27 — Enthalpy Changeover Set Points  
CO SENSOR MAX RANGE SETTING  
2
6000  
5000  
4000  
3000  
2000  
1000  
0
800 ppm  
900 ppm  
1000 ppm  
1100 ppm  
2
3
4
5
6
7
8
DAMPER VOLTAGE FOR MAX VENTILATION RATE  
Fig. 29 — CO2 Sensor Maximum Range Setting  
Fig. 28 — EconoMi$er IV Controller Potentiometer  
and LED Locations  
42  
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Minimum Position Control — There is a minimum damper  
position potentiometer on the EconoMi$er IV controller. See  
Fig. 28. The minimum damper position maintains the mini-  
mum airflow into the building during the occupied period.  
When using demand ventilation, the minimum damper  
position represents the minimum ventilation position for VOC  
(volatile organic compounds) ventilation requirements. The  
maximum demand ventilation position is used for fully occu-  
pied ventilation.  
When demand ventilation control is not being used, the  
minimum position potentimeter should be used to set the occu-  
pied ventilation position. The maximum demand ventilation  
position should be turned fully clockwise.  
Adjust the minimum position potentiometer to allow the  
minimum amount of outdoor air, as required by local codes, to  
enter the building. Make minimum position adjustments with  
at least 10° F temperature difference between the outdoor and  
return-air temperatures. To determine the minimum position  
setting, perform the following procedure:  
Demand Control Ventilation — When using the Econo-  
Mi$er IV for demand control ventilation, there are some equip-  
ment selection criteria which should be considered. When  
selecting the heat capacity and cool capacity of the equipment,  
the maximum ventilation rate must be evaluated for design  
conditions. The maximum damper position must be calculated  
to provide the desired fresh air.  
Typically the maximum ventilation rate will be about 5 to  
10% more than the typical cfm required per person, using nor-  
mal outside air design criteria.  
A proportional anticipatory strategy should be taken with  
the following conditions: a zone with a large area, varied  
occupancy, and equipment that cannot exceed the required  
ventilation rate at design conditions. Exceeding the required  
ventilation rate means the equipment can condition air at a  
maximum ventilation rate that is greater than the required  
ventilation rate for maximum occupancy. A proportional-  
anticipatory strategy will cause the fresh air supplied to  
increase as the room CO2 level increases even though the CO2  
set point has not been reached. By the time the CO2 level  
reaches the set point, the damper will be at maximum ventila-  
tion and should maintain the set point.  
In order to have the CO2 sensor control the economizer  
damper in this manner, first determine the damper voltage  
output for minimum or base ventilation. Base ventilation is the  
ventilation required to remove contaminants during unoccu-  
pied periods. The following equation may be used to determine  
the percent of outside-air entering the building for a given  
damper position. For best results there should be at least a  
10 degree difference in outside and return-air temperatures.  
1. Calculate the appropriate mixed air temperature using the  
following formula:  
(TO x OA) + (TR x RA) = TM  
TO = Outdoor-Air Temperature  
OA = Percent of Outdoor Air  
TR = Return-Air Temperature  
RA = Percent of Return Air  
TM = Mixed-Air Temperature  
As an example, if local codes require 10% outdoor air  
during occupied conditions, outdoor-air temperature is  
60 F, and return-air temperature is 75 F.  
(TO x OA) + (TR x RA) = TM  
TO = Outdoor-Air Temperature  
OA = Percent of Outdoor Air  
TR = Return-Air Temperature  
RA = Percent of Return Air  
TM = Mixed-Air Temperature  
(60 x .10) + (75 x .90) = 73.5 F  
2. Disconnect the mixed air sensor from terminals T and T1.  
3. Ensure that the factory-installed jumper is in place across  
terminals P and P1. If remote damper positioning is being  
used, make sure that the terminals are wired according to  
Fig. 26 and that the minimum position potentiometer is  
turned fully clockwise.  
Once base ventilation has been determined, set the mini-  
mum damper position potentiometer to the correct position.  
4. Connect 24 vac across terminals TR and TR1.  
The same equation can be used to determine the occupied or  
maximum ventilation rate to the building. For example, an  
output of 3.6 volts to the actuator provides a base ventilation  
rate of 5% and an output of 6.7 volts provides the maximum  
ventilation rate of 20% (or base plus 15 cfm per person). Use  
Fig. 29 to determine the maximum setting of the CO2 sensor.  
For example, a 1100 ppm set point relates to a 15 cfm per  
person design. Use the 1100 ppm curve on Fig. 29 to find the  
point when the CO2 sensor output will be 6.7 volts. Line up the  
point on the graph with the left side of the chart to determine  
that the range configuration for the CO2 sensor should be 1800  
ppm. The EconoMi$er IV controller will output the 6.7 volts  
from the CO2 sensor to the actuator when the CO2 concentra-  
tion in the space is at 1100 ppm. The DCV set point may be left  
at 2 volts since the CO2 sensor voltage will be ignored by the  
EconoMi$er IV controller until it rises above the 3.6 volt  
setting of the minimum position potentiometer.  
5. Carefully adjust the minimum position potentiometer  
until the measured mixed air temperature matches the  
calculated value.  
6. Reconnect the mixed air sensor to terminals T and T1.  
Remote control of the EconoMi$er IV damper is desirable  
when requiring additional temporary ventilation. If  
field-supplied remote potentiometer (Honeywell part number  
S963B1128) is wired to the EconoMi$er IV controller, the  
minimum position of the damper can be controlled from a re-  
mote location.  
To control the minimum damper position remotely, remove  
the factory-installed jumper on the P and P1 terminals on the  
EconoMi$er IV controller. Wire the field-supplied potentiome-  
ter to the P and P1 terminals on the EconoMi$er IV controller.  
See Fig. 26.  
a
Once the fully occupied damper position has been deter-  
mined, set the maximum damper demand control ventilation  
potentiometer to this position. Do not set to the maximum  
position as this can result in over-ventilation to the space and  
potential high-humidity levels.  
CO2 Sensor Configuration — The CO2 sensor has preset  
standard voltage settings that can be selected anytime after the  
sensor is powered up. See Table 29.  
Use setting 1 or 2 for Carrier equipment. See Table 29.  
1. Press Clear and Mode buttons. Hold at least 5 seconds  
until the sensor enters the Edit mode.  
Damper Movement — When the EconoMi$er IV board re-  
ceives initial power, it can take the damper up to 21/2 minutes  
before it begins to position itself. After the initial positioning,  
subsequent changes to damper position will take up to 30 sec-  
onds to initiate. Damper movement from full open to full  
closed (or vice versa) takes 21/2 minutes.  
Thermostats — The EconoMi$er IV control works with con-  
ventional thermostats that have a Y1 (cool stage 1), Y2 (cool  
stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The  
EconoMi$er IV control does not support space temperature  
sensors like the T55 or T56. Connections are made at the ther-  
mostat terminal connection board located in the main control  
box.  
2. Press Mode twice. The STDSET Menu will appear.  
43  
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3. Use the Up/Down button to select the preset number. See  
Table 29.  
4. Press Enter to lock in the selection.  
outside air. The design should produce an air temperature  
somewhat near room conditions to prevent reheat of the air  
mixture. The energy recovery device should be interlocked  
with the heat to turn off the device when in the heat mode.  
5. Press Mode to exit and resume normal operation.  
Operating Sequence  
The custom settings of the CO2 sensor can be changed any-  
time after the sensor is energized. Follow the steps below to  
change the non-standard settings:  
1. Press Clear and Mode buttons. Hold at least 5 seconds  
until the sensor enters the Edit mode.  
2. Press Mode twice. The STDSET Menu will appear.  
3. Use the Up/Down button to toggle to the NONSTD menu  
and press Enter.  
COOLING, UNITS WITHOUT ECONOMIZER — When  
the thermostat calls for one stage of cooling, Y1 and G are en-  
ergized. The indoor-fan contactor (IFC) and compressor con-  
tactor(s) (C.A1 and C.B1 on three-compressor units or C.A1  
only on two-compressor units), and outdoor-fan contactors  
(OFC1 and OFC2 when outdoor temperature is above LTS set-  
ting) are energized and the indoor-fan motor, compressor(s)  
(A1 and B1 on three compressor units or A1 only on two-  
compressor units), and outdoor fans controlled by OFC1 are  
started. If the outdoor temperature is above the setting of the  
low temperature switch, the outdoor fans controlled by OFC2  
are also started.  
4. Use the Up/Down button to toggle through each of the  
nine variables, starting with Altitude, until the desired  
setting is reached.  
5. Press Mode to move through the variables.  
If more cooling is required, the thermostat will call for a  
second stage of cooling, energizing Y2. This will allow relay  
CR1 to energize, which in turn energizes the compressor  
contactor (C.C1 on three-compressor units or C.B1 on  
two-compressor units). The second stage compressor (C1 on  
three-compressor units or B1 on two-compressor units is then  
started.  
6. Press Enter to lock in the selection, then press Mode to  
continue to the next variable.  
Dehumidification of Fresh Air with DCV Control — Infor-  
mation from ASHRAE (American Society of Heating,  
Refrigeration, and Air Conditioning Engineers) indicates that  
the largest humidity load on any zone is the fresh air intro-  
duced. For some applications, a device such as a 62AQ energy  
recovery unit is added to reduce the moisture content of the  
fresh air being brought into the building when the enthalpy is  
high. In most cases, the normal heating and cooling processes  
are more than adequate to remove the humidity loads for most  
commercial applications.  
This makes the control of the of the dehumidification device  
simple when using the enthalpy or differential enthalpy sensor.  
The enthalpy sensor or differential enthalpy sensor is installed  
on the equipment to determine economizer operation. The  
high enthalpy signal from the enthalpy sensor or differential  
enthalpy sensor can be used to turn on the outdoor air moisture  
removal device any time fresh air is required for the space.  
HEATING, UNITS WITHOUT ECONOMIZER  
NOTE: The 48PG20-28 units have 2 stages of heat.  
When the thermostat calls for heating, power is sent to W  
on the IGC (integrated gas unit controller) board. An LED  
(light-emitting diode) on the IGC board will be on during nor-  
mal operation. A check is made to ensure that the rollout  
switch and limit switch are closed and the induced-draft motor  
is running. The induced-draft motor is then energized, and  
when speed is proven with the hall effect sensor on the motor,  
the ignition activation period begins. The burners will ignite  
within 5 seconds.  
If the burners do not light, there is a 22-second delay before  
another 5-second attempt. If the burners still do not light, this  
sequence is repeated for 15 minutes. After the 15 minutes have  
elapsed, if the burners still have not lit, heating is locked out.  
To reset the control, break 24-v power to the thermostat.  
The energy recovery device should be sized for maximum  
latent and sensible conditioning at maximum ventilation on a  
design day. A calculation for leaving-air temperature on a low  
ambient, low ventilation day should also be done to determine  
the mixed-air temperature of the return and pre-conditioned  
Table 29 — CO2 Sensor Standard Settings  
VENTILATION  
RATE  
(cfm/Person)  
CO2  
OPTIONAL  
RELAY  
ANALOG  
OUTPUT  
SETTING  
EQUIPMENT  
OUTPUT  
CONTROL RANGE RELAY SETPOINT HYSTERESIS  
(ppm)  
(ppm)  
(ppm)  
0-10V  
1
2
3
4
5
6
7
8
9
Proportional  
Proportional  
Exponential  
Proportional  
Proportional  
Exponential  
Exponential  
Proportional  
Proportional  
Any  
Any  
Any  
15  
0-2000  
1000  
50  
4-20 mA  
Interface w/Standard  
2-10V  
7-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-10V  
4-20 mA  
0-2000  
0-2000  
0-1100  
0- 900  
0-1100  
0- 900  
0-9999  
0-2000  
1000  
1100  
1100  
900  
50  
50  
Building Control System  
50  
20  
50  
Economizer  
15  
1100  
900  
50  
20  
50  
Health & Safety  
—
5000  
700  
500  
50  
Parking/Air Intakes/  
Loading Docks  
—
LEGEND  
PPM — Parts Per Million  
44  
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When ignition occurs the IGC board will continue to moni-  
tor the condition of the rollout and limit switches, the hall effect  
sensor, as well as the flame sensor. If the unit is controlled  
through a room thermostat set for fan auto., 45 seconds after  
ignition occurs, the indoor-fan motor will be energized (and the  
outdoor-air dampers will open to their minimum position). If  
for some reason the overtemperature limit opens prior to the  
start of the indoor fan blower, on the next attempt, the  
45-second delay will be shortened to 5 seconds less than the  
time from initiation of heat to when the limit tripped. Gas will  
not be interrupted to the burners and heating will continue.  
Once modified, the fan on delay will not change back to  
45 seconds unless power is reset to the control.  
When additional heat is required, W2 closes and initiates  
power to the second stage of the main gas valve. When the  
thermostat is satisfied, W1 and W2 open and the gas valve  
closes, interrupting the flow of gas to the main burners. If the  
call for W1 lasted less than 1 minute, the heating cycle will not  
terminate until 1 minute after W1 became active. If the unit is  
controlled through a room thermostat set for fan auto., the  
indoor-fan motor will continue to operate for an additional  
45 seconds then stop (and the outdoor-air dampers will close).  
If the overtemperature limit opens after the indoor motor is  
stopped within 10 minutes of W1 becoming inactive, on the  
next cycle the time will be extended by 15 seconds. The  
maximum delay is 3 minutes. Once modified, the fan off delay  
will not change back to 45 seconds unless power is reset to  
the control.  
On the initial power to the EconoMi$er IV control, it will  
take the damper up to 21/2 minutes before it begins to position  
itself. Any change in damper position will take up to 30 sec-  
onds to initiate. Damper movement from full closed to full  
open (or vice versa) will take between 11/2 and 21/2 minutes.  
If free cooling can be used as determined from the appropri-  
ate changeover command (switch, dry bulb, enthalpy curve,  
differential dry bulb, or differential enthalpy), then the control  
will modulate the dampers open to maintain the mixed-air tem-  
perature set point at 50 to 55 F.  
If there is a further demand for cooling (cooling second  
stage — Y2 is energized), then the control will bring on  
compressor stage 1 to maintain the mixed-air temperature set  
point. The EconoMi$er IV damper will be open at maximum  
position. EconoMi$er IV operation is limited to a single  
compressor.  
HEATING, UNITS WITH ECONOMI$ER IV — When  
the room temperature calls for heat, the heating controls are  
energized as described in the Heating, Units Without Econo-  
mizer section. The IFM is energized and the EconoMi$er IV  
damper modulates to the minimum position. When the thermo-  
stat is satisfied and W1 and W2 are deenergized, the IFM  
continues to run, and the economizer damper modulates to the  
minimum position.  
SUBCOOLER HEAT EXCHANGER (SHX) — The purpose  
of the subcooler heat exchanger (SHX) and the subcooler TXV  
is to increase the capacity of the evaporator by sending  
subcooled liquid refrigerant into the evaporator. Normally, the  
condenser subcools the liquid refrigerant by approximately  
10 F. The SHX adds another 10 F to 15 F degrees of subcooling  
before the refrigerant reaches the evaporator. This allows the  
refrigerant to absorb more heat from the mixed air, thereby  
providing more cooling capacity.  
A LED indicator is provided on the IGC to monitor opera-  
tion. The IGC is located by removing the side panel and view-  
ing the IGC through the view port located in the control box  
access panel. During normal operation, the LED is continuous-  
ly on. For information on troubleshooting refer to page 57.  
COOLING, UNITS WITH ECONOMI$ER IV — When free  
cooling is not available, the compressors will be controlled by  
the zone thermostat. When free cooling is available, the  
outdoor-air damper is modulated by the EconoMi$er IV  
control to provide a 50 to 55 F mixed-air temperature into the  
zone. As the mixed-air temperature fluctuates above 55 or  
below 50 F, the dampers will be modulated (open or close) to  
bring the mixed air temperature back within control.  
If mechanical cooling is utilized with free cooling, the  
outdoor-air damper will maintain its current position at the time  
the compressor is started. If the increase in cooling capacity  
causes the mixed-air temperature to drop below 45 F, then the  
outdoor-air damper position will be decreased to the minimum  
position. If the mixed-air temperature continues to fall, the  
outdoor-air damper will close. Control returns to normal once  
the mixed-air temperature rises above 48 F.  
The subcooler functions by taking a small percentage of the  
high pressure, low temperature liquid refrigerant which exits  
the condenser and converting it into a low pressure, low tem-  
perature gas. This is accomplished by using the subcooler  
TXV. The gas is then routed through a reverse-flow heat  
exchanger (SHX), which transfers heat from the remaining  
liquid refrigerant in the liquid line to the reverse flow gas  
refrigerant. The moderate temperature gas is then sent to the  
compressor to complete the loop and the cooler liquid refriger-  
ant continues its normal path to the main TXV and the  
evaporator. See Fig. 30.  
COMPRESSOR  
COND  
If optional power exhaust is installed, as the outdoor-air  
damper opens and closes, the power exhaust fans will be ener-  
gized and deenergized.  
If field-installed accessory CO2 sensors are connected to the  
EconoMi$er IV control, a demand controlled ventilation strate-  
gy will begin to operate. As the CO2 level in the zone increases  
above the CO2 set point, the minimum position of the damper  
will be increased proportionally. As the CO2 level decreases  
because of the increase in fresh air, the outdoor-air damper will  
be proportionally closed.  
SUBCOOLER  
HX  
SUBCOOLER TXV  
For EconoMi$er IV operation, there must be a thermostat  
call for the fan (G). This will move the damper to its minimum  
position.  
When the EconoMi$er IV control is in the occupied mode  
and a call for cooling exists (Y1 on the thermostat), the control  
will first check for indoor fan operation. If the fan is not on,  
then cooling will not be activated. If the fan is on, then the  
control will open the EconoMi$er IV damper to the minimum  
position.  
EVAP  
MAIN TXV  
Fig. 30 — Subcooler Operation  
45  
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This will make cleaning efforts more difficult. Surface loaded  
fibers must be completely removed prior to using low velocity  
clean water rinse.  
SERVICE  
Periodic Clean Water Rinse — A periodic clean water rinse is  
very beneficial for coils that are applied in coastal or industrial  
environments. However, it is very important that the water  
rinse is made with very low velocity water stream to avoid  
damaging the fin edges. Monthly cleaning as described below  
is recommended.  
Before performing service or maintenance operations on  
unit, turn off main power switch to unit. Electrical shock  
could cause personal injury.  
Routine Cleaning of Coil Surfaces — Monthly cleaning with  
Totaline® environmentally sound coil cleaner is essential to  
extend the life of coils. This cleaner is available from Carrier  
Replacement parts division as part number P902-0301 for a  
one gallon container, and part number P902-0305 for a 5 gallon  
container. It is recommended that all coils, including standard  
aluminum, pre-coated, copper/copper or E-coated coils be  
cleaned with the Totaline environmentally sound coil cleaner  
as described below. Coil cleaning should be part of the unit’s  
regularly scheduled maintenance procedures to ensure long life  
of the coil. Failure to clean the coils may result in reduced du-  
rability in the environment.  
Puron® (R-410A) refrigerant systems operate at higher  
pressures than standard R-22 systems. Do not use R-22  
service equipment or components on Puron refrigerant  
equipment. If service equipment is not rated for Puron  
refrigerant, equipment damage or personal injury may  
result.  
1. Improper installation, adjustment, alteration, service,  
or maintenance can cause property damage, personal  
injury, or loss of life. Refer to the User’s Information  
Manual provided with this unit for more details.  
2. Do not store or use gasoline or other flammable  
vapors and liquids in the vicinity of this or any other  
appliance.  
What to do if you smell gas:  
1. DO NOT try to light any appliance.  
2. DO NOT touch any electrical switch, or use any  
phone in your building.  
Avoid the use of:  
• coil brighteners  
• acid cleaning prior to painting  
• high pressure washers  
• poor quality water for cleaning  
Totaline environmentally sound coil cleaner is non-flamma-  
ble, hypoallergenic, nonbacterial, and a USDA accepted biode-  
gradable agent that will not harm the coil or surrounding com-  
ponents such as electrical wiring, painted metal surfaces, or in-  
sulation. Use of non-recommended coil cleaners is strongly  
discouraged since coil and unit durability could be affected.  
Totaline Environmentally Sound Coil Cleaner Application  
Equipment  
3. IMMEDIATELY call your gas supplier from a neigh-  
bor’s phone. Follow the gas supplier’s instructions.  
4. If you cannot reach your gas supplier, call the fire  
department.  
• 21/2 gallon garden sprayer  
• water rinse with low velocity spray nozzle  
Harsh chemicals, household bleach or acid or basic clean-  
ers should not be used to clean outdoor or indoor coils of  
any kind. These cleaners can be very difficult to rinse out  
of the coil and can accelerate corrosion at the fin/tube inter-  
face where dissimilar materials are in contact. If there is  
dirt below the surface of the coil, use the Totaline environ-  
mentally sound coil cleaner as described above.  
Disconnect gas piping from unit when pressure testing at  
pressure greater than 0.5 psig. Pressures greater than  
0.5 psig will cause gas valve damage resulting in hazardous  
condition. If gas valve is subjected to pressure greater than  
0.5 psig, it must be replaced before use. When pressure  
testing field-supplied gas piping at pressures of 0.5 psig or  
less, a unit connected to such piping must be isolated by  
closing the manual gas valve(s).  
Cleaning — Inspect unit interior at beginning of each heat-  
ing and cooling season and as operating conditions require. Re-  
move unit top panel and/or side panels for access to unit interior.  
High velocity water from a pressure washer, garden hose,  
or compressed air should never be used to clean a coil. The  
force of the water or air jet will bend the fin edges and  
increase airside pressure drop. Reduced unit performance  
or nuisance unit shutdown may occur.  
COIL MAINTENANCE AND CLEANING RECOMMEN-  
DATION — Routine cleaning of coil surfaces is essential to  
maintain proper operation of the unit. Elimination of contami-  
nation and removal of harmful residues will greatly increase  
the life of the coil and extend the life of the unit. The following  
maintenance and cleaning procedures are recommended as  
part of the routine maintenance activities to extend the life of  
the coil.  
Remove Surface Loaded Fibers — Surface loaded fibers or  
dirt should be removed with a vacuum cleaner. If a vacuum  
cleaner is not available, a soft non-metallic bristle brush may  
be used. In either case, the tool should be applied in the direc-  
tion of the fins. Coil surfaces can be easily damaged (fin edges  
can be easily bent over and damage to the coating of a protect-  
ed coil) if the tool is applied across the fins.  
Totaline Environmentally Sound Coil Cleaner Application  
Instructions  
1. Proper eye protection such as safety glasses is recom-  
mended during mixing and application.  
2. Remove all surface loaded fibers and dirt with a vacuum  
cleaner as described above.  
3. Thoroughly wet finned surfaces with clean water and a  
low velocity garden hose, being careful not to bend fins.  
4. Mix Totaline environmentally sound coil cleaner in a  
21/2 gallon garden sprayer according to the instructions  
included with the cleaner. The optimum solution temper-  
ature is 100 F.  
NOTE: Do NOT USE water in excess of 130 F, as the enzy-  
matic activity will be destroyed.  
NOTE: Use of a water stream, such as a garden hose, against a  
surface loaded coil will drive the fibers and dirt into the coil.  
46  
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5. Thoroughly apply Totaline® environmentally sound coil  
cleaner solution to all coil surfaces including finned area,  
tube sheets and coil headers.  
Use caution with ceramic heat exchanger baffles. When in-  
stalling retaining clip, be sure the center leg of the clip extends  
inward toward baffle. See Fig. 32.  
6. Hold garden sprayer nozzle close to finned areas and ap-  
ply cleaner with a vertical, up-and-down motion. Avoid  
spraying in horizontal pattern to minimize potential for  
fin damage.  
COMBUSTION-AIR BLOWER — Clean periodically to as-  
sure proper airflow and heating efficiency. Inspect blower  
wheel every fall and periodically during heating season. For the  
first heating season, inspect blower wheel bi-monthly to deter-  
mine proper cleaning frequency.  
To inspect blower wheel, remove heat section panel. Using  
an inspection mirror and flashlight, look into the flue exhaust  
duct to inspect the wheel. If cleaning is required, remove motor  
and wheel assembly by removing the screws holding the flue  
box cover to the flue box. See Fig. 31. Remove the screws hold-  
ing the inducer housing to the inlet plate. The wheel can then be  
removed from the motor shaft and cleaned with a detergent or  
solvent. Replace the wheel onto the motor shaft in the correct  
position and reassemble the flue cover onto the flue box.  
7. Ensure cleaner thoroughly penetrates deep into finned  
areas.  
8. Interior and exterior finned areas must be thoroughly  
cleaned.  
9. Finned surfaces should remain wet with cleaning solution  
for 10 minutes.  
10. Ensure surfaces are not allowed to dry before rinsing. Re-  
applying cleaner as needed to ensure 10-minute satura-  
tion is achieved.  
11. Thoroughly rinse all surfaces with low velocity clean wa-  
ter using downward rinsing motion of water spray nozzle.  
Protect fins from damage from the spray nozzle.  
CONDENSATE DRAIN — Check and clean each year at the  
start of the cooling season. In winter, keep drains and traps dry.  
An access panel is located above the condensate connection to  
allow easy clean out of the condensate pan. The first time the  
panel is removed, the insulation behind the access panel will  
need to be cut away. Carefully cut the insulation with a knife or  
blade on three sides so the insulation can be folded out of the  
way during cleaning. Be careful not to damage components be-  
hind the insulation while cutting. Once cleaning is completed,  
fold the insulation back into place and secure the access panel  
in the original position.  
Lubrication  
COMPRESSORS — Each compressor is charged with the  
correct amount of oil at the factory.  
The compressor is in a Puron® refrigerant system and uses  
a polyolester (POE) oil. This oil is extremely hygroscopic,  
meaning it absorbs water readily. POE oils can absorb  
15 times as much water as other oils designed for HCFC  
and CFC refrigerants. Avoid exposure of the oil to the  
atmosphere. Damage to components could result.  
FILTERS — Clean or replace at start of each heating and cool-  
ing season, or more often if operating conditions require. Refer  
to Table 1 for type and size.  
OUTDOOR-AIR INLET SCREENS — Clean screens with  
steam or hot water and a mild detergent. Do not use throwaway  
filters in place of screens. See Table 2 for quantity and size.  
MAIN BURNER — At the beginning of each heating season,  
inspect for deterioration or blockage due to corrosion or other  
causes. Observe the main burner flames. Refer to Main Burn-  
ers section on page 51.  
FLUE GAS PASSAGEWAYS — The flue collector box and  
heat exchanger cells may be inspected by removing heat  
section access panel (Fig. 4), flue box cover, and main burner  
assembly (Fig. 31). Refer to Main Burners section on page 51  
for burner removal sequence. If cleaning is required, clean  
tubes with a wire brush.  
Polyolester (POE) compressor lubricants are known to  
cause long term damage to some synthetic roofing materials.  
Exposure, even if immediately cleaned up, may cause roofing  
materials to become brittle (leading to cracking) within a  
year. When performing any service which may risk exposure of  
compressor oil to the roof, take appropriate precautions to  
protect roofing. Procedures which risk oil leakage include com-  
pressor replacement, repairing refrigerant leaks, and replacing  
refrigerant components. To prepare rooftop:  
1. Cover extended roof work area with an impermeable  
plastic dropcloth or tarp. Make sure a 10 x 10 area around  
the work area is covered.  
2. Cover area in front of the unit service panel with a terry  
cloth shop towel to absorb lubricant spills and prevent  
run-offs. Towel will also protect dropcloth from tears  
caused by tools or components.  
3. Place terrycloth shop towel inside the unit directly under  
components to be serviced to prevent spills through the  
bottom of the unit.  
4. Perform the required service.  
5. Remove and dispose of any oil contaminated material per  
local codes.  
CERAMIC  
BAFFLE  
COMBUSTION  
FAN HOUSING  
CLIP  
HEAT  
EXCHANGER  
INDUCED  
DRAFT  
SECTION  
MOTOR  
MAIN GAS  
VALVE  
IGC BOARD  
(HIDDEN)  
NOTE: One baffle and clip will be in each upper tube of the heat  
exchanger.  
MAIN BURNER  
SECTION  
IGC — Integrated Gas  
Controller  
Fig. 32 — Removing Heat Exchanger Ceramic  
Baffles and Clips  
Fig. 31 — Typical Gas Heating Section  
47  
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FAN SHAFT BEARINGS — Lubricate bearings at least ev-  
ery 6 months with suitable bearing grease. Typical lubricants  
are given below:  
To align fan and motor pulleys:  
1. Loosen fan pulley setscrews.  
2. Slide fan pulley along fan shaft.  
3. Make angular alignment by loosening motor from  
mounting plate.  
MANUFACTURER  
LUBRICANT  
Texaco  
Mobil  
Sunoco  
Texaco  
Regal AFB-2*  
Mobilplex EP No. 1  
Prestige 42  
Evaporator Fan Belt Tension Adjustment — To  
adjust belt tension:  
Multifak 2  
1. Turn off unit power.  
*Preferred lubricant because it contains rust and oxidation inhibitors.  
2. Slide out fan deck to service position as shown in Evapo-  
rator Fan Service and Replacement section above.  
3. Loosen fan motor bolts.  
4. Move motor mounting plate to adjust to proper belt ten-  
sion. See Table 30. Motor adjuster bolts may be used to  
tighten belts. See Fig. 33.  
5. Check for proper belt alignment. Adjust if necessary.  
6. Tighten motor mounting plate bolts to lock motor in  
proper position.  
7. Return fan deck back into operating position.  
8. Restore power to unit.  
FAN MOTOR BEARINGS — Fan motor bearings are of the  
permanently lubricated type. No field lubrication is required.  
No lubrication of the condenser or evaporator motors are  
required.  
Manual Outdoor Air Damper — If manual outdoor  
air damper blade adjustment is required, refer to Step 10 — In-  
stall Outdoor Air Hood section on page 12.  
Economizer Adjustment — If economizer adjustment  
is required, refer to Optional EconoMi$er IV section on  
page 39.  
Evaporator Fan Service and Replacement — The  
48PG units feature a slide-out fan deck for easy servicing of the  
indoor-fan motor, pulleys, belt, and bearings. To service com-  
ponents in this section, perform the following procedure:  
1. Turn off unit power.  
MOTOR  
2. Open the fan section access panel.  
3. Remove three no. 10 screws at front of slide-out fan deck.  
Save screws. See Fig. 33.  
PULLEY  
FAN  
PULLEY  
(HIDDEN)  
4. Disconnect the limit switch wires located on the right  
side of the fan deck. Other wires do not need to be  
disconnected.  
MOTOR  
5. Fan deck can now be slid out to access serviceable  
components.  
MOUNTING  
BASE  
LIMIT  
SWITCH  
QUICK  
CONNECT  
SLIDE-OUT  
FAN DECK  
DO NOT SLIDE FAN DECK OUT PAST THE STOP  
BRACKET. If further access is required, the fan deck must  
be supported. Make sure plugs and wiring are not pinched  
between fan housing and unit center post. Damage to unit  
may result.  
Fig. 33 — Evaporator-Fan Motor Adjustment  
6. To replace fan deck to operating position, slide fan deck  
back into the unit. Secure with the three no. 10 screws  
removed in Step 3.  
7. Re-attach electrical plugs and wires.  
8. Close fan section access door.  
9. Restore power to unit.  
Evaporator Fan Performance Adjustment  
(Fig. 33 and 34) — Fan motor pulleys are factory set  
for speed shown in Table 27.  
To change fan speeds:  
1. Shut off unit power supply.  
2. Loosen nuts on the 4 carriage bolts in the mounting base.  
Using adjusting bolts and plate, slide motor and remove  
belt.  
3. Loosen movable-pulley flange setscrew (see Fig. 34).  
4. Screw movable flange toward fixed flange to increase  
speed and away from fixed flange to decrease speed.  
Increasing fan speed increases load on motor. Do not  
exceed maximum speed specified in Table 27.  
See Table 24 for air quantity limits.  
5. Set movable flange at nearest keyway of pulley hub and  
tighten setscrew. (See Table 27 for speed change for each  
full turn of pulley flange.)  
6. Replace and tighten belts (see Evaporator Fan Belt Ten-  
sion Adjustment section below).  
Fig. 34 — Evaporator-Fan Alignment  
and Adjustment  
7. Restore power to unit.  
48  
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Table 30 — Belt Tension Adjustment  
BELT TENSION (lb)  
48PG  
20  
VOLTAGE  
Unit Model Number Position 10  
A,J  
4.8  
4.8  
5.3  
4.8  
4.8  
5.3  
4.5  
4.5  
4.5  
B,K  
5.1  
5.1  
5.1  
5.1  
5.1  
5.1  
5.4  
5.4  
5.4  
C,L  
5.6  
5.6  
5.6  
5.6  
5.6  
5.6  
5.9  
5.9  
5.9  
D,M  
4.5  
4.5  
4.5  
4.5  
4.5  
4.5  
4.5  
4.5  
4.5  
E,N  
NA  
NA  
NA  
NA  
NA  
NA  
4.5  
4.5  
4.5  
F,P  
4.7  
4.7  
5.2  
4.7  
4.7  
5.2  
5.4  
5.4  
5.4  
G,Q  
5.0  
5.0  
5.0  
5.0  
5.0  
5.0  
5.9  
5.9  
5.9  
H,R  
5.5  
5.5  
5.5  
5.5  
5.5  
5.5  
4.5  
4.5  
4.5  
230  
460  
575  
230  
460  
575  
230  
460  
575  
24  
28  
Condenser-Fan Adjustment (Fig. 35)  
1. Shut off unit power supply.  
2. Remove condenser-fan assembly (grille, motor, motor  
cover, and fan) and loosen fan hub setscrews.  
3. Adjust fan height as shown in Fig. 35.  
4. Tighten setscrews and replace condenser-fan assembly.  
5. Turn on power to unit.  
Evacuation — Proper evacuation of the system will re-  
move noncondensables and ensure a tight, dry system before  
charging. Evacuate from both high and low side ports. Never  
use the system compressor as a vacuum pump. Refrigerant  
tubes and indoor coil should be evacuated to 500 microns.  
Always break a vacuum with dry nitrogen. The two possible  
methods are the deep vacuum method and the triple evacuation  
method  
DEEP VACUUM METHOD — The deep vacuum method  
requires a vacuum pump capable of pulling a minimum vacu-  
um of 500 microns and a vacuum gage capable of accurately  
measuring this vacuum depth. The deep vacuum method is the  
most positive way of assuring a system is free of air and liquid  
water. (See Fig. 36.)  
TRIPLE EVACUATION METHOD — The triple evacuation  
method should only be used when vacuum pump is capable of  
pumping down to 28 in. of mercury and system does not con-  
tain any liquid water. Proceed as follows:  
Fig. 35 — Condenser-Fan Adjustment  
1. Pump system down to 28 in. of mercury and allow pump  
to continue operating for an additional 15 minutes.  
2. Close service valves and shut off vacuum pump.  
3. Connect a nitrogen cylinder and regulator to system and  
open until system pressure is 2 psig.  
4. Close service valve and allow system to stand for 1 hr.  
During this time, dry nitrogen will be able to diffuse  
throughout the system, absorbing moisture.  
Verify Sensor Performance — Using an ohmmeter  
and a thermometer, compare measured temperature to the  
resistance shown in Table 31.  
Table 31 — Sensor Temperature/Resistance Values  
TEMPERATURE (F)  
RESISTANCE (ohms)  
–58  
–40  
–22  
–4  
14  
32  
50  
68  
77  
86  
104  
122  
140  
158  
176  
185  
194  
212  
230  
248  
257  
266  
284  
302  
200,250  
100,680  
53,010  
29,091  
16,590  
9,795  
5,970  
3,747  
3,000  
2,416  
1,597  
1,080  
746  
5. Repeat this procedure. System will then contain minimal  
amounts of contaminants and water vapor.  
5000  
4500  
4000  
LEAK IN  
SYSTEM  
3500  
3000  
2500  
2000  
525  
376  
321  
274  
203  
153  
116  
102  
VACUUM TIGHT  
TOO WET  
1500  
1000  
TIGHT  
DRY SYSTEM  
500  
2
3
4
5
6
7
0
1
89  
70  
55  
MINUTES  
Fig. 36 — Deep Vacuum Graph  
Economizer Operation During Power Fail-  
ure — Dampers have a spring return. In event of power fail-  
ure, dampers will return to fully closed position until power is  
restored. Do not manually operate damper motor.  
49  
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Refrigerant Charge — Amount of refrigerant charge is  
listed on unit nameplate. Refer to Carrier GTAC II; Module 5;  
Charging, Recovery, Recycling, and Reclamation section for  
charging methods and procedures. Unit panels must be in place  
when unit is operating during charging procedure.  
Puron® (R-410A) refrigerant cylinders contain a dip tube  
which allows liquid refrigerant to flow from the cylinder in an  
upright position. Charge units with cylinder in the upright  
position and a commercial type metering device in the mani-  
fold hose.  
This system uses Puron refrigerant which has higher  
pressures than R-22 and other refrigerants. No other refrig-  
erant may be used in this system. Gage set, hoses, and  
recovery system must be designed to handle Puron refrig-  
erant. If unsure about equipment, consult the equipment  
manufacturer.  
Fig. 38 — Charging Chart — 48PG24  
NOTE: Do not use recycled refrigerant as it may contain  
contaminants.  
NO CHARGE — Use standard evacuating techniques. After  
evacuating system, weigh in the specified amount of refriger-  
ant (refer to unit nameplate).  
LOW CHARGE COOLING — Using cooling charging chart  
(see Fig. 37-39), add or remove refrigerant until conditions of  
the chart are met. An accurate pressure gage and temperature-  
sensing device are required. Charging is accomplished by  
ensuring the proper amount of liquid subcooling. Measure  
liquid line pressure at the liquid line service valve using pressure  
gage. Connect temperature sensing device to the liquid line near  
the liquid line service valve and insulate it so that outdoor ambi-  
ent temperature does not affect reading.  
TO USE THE COOLING CHARGING CHART — Use the  
above temperature and pressure readings, and find the intersec-  
tion point on the cooling charging chart. If intersection point on  
chart is above line, add refrigerant. If intersection point on  
chart is below line, carefully recover some of the charge. Re-  
check suction pressure as charge is adjusted.  
Fig. 39 — Charging Chart — 48PG28  
NOTE: Indoor-air cfm must be within normal operating range  
of unit. All outdoor fans must be operating.  
The TXV (thermostatic expansion valve) is set to maintain  
between 10 and 15 degrees of superheat at the compressors.  
The valves are factory set and cannot be adjusted. Do not use a  
TXV designed for use with R-22 refrigerant.  
equipment and replacement components are designed to oper-  
ate with Puron refrigerant. Do not mix with components that  
have been used with other refrigerants. Puron refrigerant, as  
with other HFCs, is only compatible with POE oils.  
PURON REFRIGERANT — Puron refrigerant operates at 50  
to 70 percent higher pressures than R-22. Be sure that servicing  
Recovery cylinder service pressure rating must be 400 psig.  
Puron systems should be charged with liquid refrigerant. Use a  
commercial-type metering device in the manifold hose. Mani-  
fold sets should be 750 psig high-side and 200 psig low-side  
with 520 psig low-side retard. Use hoses with 750 psig service  
pressure rating. Leak detectors should be designed to detect  
HFC refrigerant.  
Gas Valve Adjustment  
NATURAL GAS — The gas valve opens and closes in re-  
sponse to the thermostat or limit control.  
When power is supplied to valve terminals W2 (High Fire)  
and C1, the main valve opens to its preset position.  
The regular factory setting is stamped on the valve body.  
The setting is 3.00 in. wg for vertical supply/discharge units.  
The setting is 2.95 in. wg for horizontal supply/discharge units.  
To adjust regulator:  
1. Set unit at setting for no call for heat.  
2. Turn main gas valve to OFF position.  
1
3. Remove /8-in. pipe plug from manifold or gas valve  
pressure tap connection. Install a suitable pressure-  
measuring device.  
Fig. 37 — Charging Chart — 48PG20  
50  
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4. Set main gas valve to ON position.  
5. Set thermostat at setting to call for heat.  
REGULATOR  
ADJUSTMENT SCREW  
(REMOVE COVER)  
2 LEADS, #18 WIRE 1/32 INSULATION,  
600V. MAX., 105°C  
6. Remove screw cap covering regulator adjustment screw  
(see Fig. 40).  
7. Turn adjustment screw clockwise to increase pressure or  
counterclockwise to decrease pressure.  
OUTLET PRESSURE  
TAP (PLUGGED)  
1/8-27 N.P.T. THDS.  
8. Once desired pressure is established, set unit setting  
for no call for heat, turn off main gas valve, remove  
pressure-measuring device, and replace 1/8-in. pipe  
plug and screw cap.  
RECEPTACLE AND  
TAB COMBINATION  
TERMINAL  
D-1  
W-1  
D-2  
C1  
High Altitude — For high altitude applications greater  
than 2000 ft the heat input rate should be reduced. The higher  
the altitude is above sea level, the less oxygen is in the air. See  
Table 32 for orifice sizing. A high altitude kit is available to  
convert unit for altitudes up to 7,000 ft.  
C2  
W-2  
PILOT CONNECTION  
FOR 1/4” O.D. TUBING  
(PLUGGED)  
INLET PRESSURE TAP  
(PLUGGED)  
1/8 - 27 N.P.T. THDS.  
RECEPTACLE TERMINAL  
Main Burners — For all applications, main burners are  
Fig. 40 — Gas Valve  
factory set and should require no adjustment.  
MAIN BURNER REMOVAL  
CLEANING AND ADJUSTMENT  
1. Remove burner rack from unit as described in Main  
Burner Removal section above.  
2. Inspect burners, and if dirty, remove burners from rack.  
3. Using a soft brush, clean burners and crossover port as  
required.  
4. Adjust spark gap. See Fig. 41.  
5. Reinstall burners on rack.  
6. Reinstall burner rack as described above.  
1. Shut off (field-supplied) manual main gas valve.  
2. Shut off power to unit.  
3. Remove gas section access panel.  
4. Disconnect gas piping from gas valve inlet.  
5. Remove wires from gas valve.  
6. Remove wires from rollout switch.  
7. Remove sensor wire and ignitor cable from IGC board.  
8. Remove 2 screws securing manifold bracket to basepan.  
9. Remove 2 screws that hold the burner assembly to vesti-  
bule plate.  
10. Lift burner/manifold assembly out of unit.  
SEE DETAIL “C”  
Fig. 41 — Spark Gap Adjustment  
51  
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Table 32 — Altitude Compensation*  
NATURAL GAS  
NATURAL GAS ORIFICE SIZE†  
ELEVATION  
(ft)  
Low Heat  
Medium Heat  
High Heat (6 Cell)  
High Heat (8 Cell)  
0-1,999  
2,000  
3,000  
4,000  
5,000  
6,000  
7,000  
8,000  
9,000  
10,000  
29  
29  
30  
30  
30  
30  
31  
31  
31  
32  
30  
30  
31  
31  
31  
31  
32  
32  
32  
33  
29  
29  
30  
30  
30  
30  
31  
31  
31  
32  
29  
29  
30  
30  
30  
30  
31  
31  
31  
32  
*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input  
rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft.  
†Orifices available through the local Carrier dealer.  
PROPANE GAS  
PROPANE GAS ORIFICE SIZE†  
Medium Heat High Heat (6 Cell)  
38 35  
ELEVATION  
(ft)  
Low Heat  
High Heat (8 Cell)  
0-1,999  
2,000  
3,000  
4,000  
5,000  
6,000  
7,000  
8,000  
9,000  
10,000  
35  
36  
36  
37  
37  
38  
39  
40  
41  
42  
35  
36  
36  
37  
37  
38  
39  
40  
41  
42  
39  
39  
40  
40  
41  
42  
43  
44  
45  
36  
36  
37  
37  
38  
39  
40  
41  
42  
*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input  
ate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft.  
†Orifices available through the local Carrier dealer.  
Compressor Lockout (CLO) Device — The CLO prevents  
automatic recycling of the compressor as safety controls reset.  
If the high-pressure switch, low-pressure switch or freeze pro-  
tection switch opens, the CLO device will energize to block  
further compressor operation. To reset the CLO (after all safety  
switches have reset), either open the thermostat to remove the  
cooling demand signal (and then re-close) or cycle the control  
power in the unit.  
EVAPORATOR FAN MOTOR PROTECTION — A manu-  
al reset, calibrated trip, magnetic circuit breaker protects  
against overcurrent. Do not bypass connections or increase the  
size of the breaker to correct trouble. Determine the cause and  
correct it before resetting the breaker.  
CONDENSER-FAN MOTOR PROTECTION — Each  
condenser-fan motor is internally protected against  
overtemperature.  
Fuses are also located in the control box and feed power to  
the condenser fan motors. Always replace blown fuses with the  
correct size fuse as indicated on the unit fuse label.  
Filter Drier — Replace whenever refrigerant system is ex-  
posed to atmosphere. Only use factory specified liquid-line  
filter driers with working pressures no less than 650 psig. Do  
not install a suction-line filter drier in liquid line. A liquid-line  
filter drier designed for use with Puron® refrigerant is required  
for each circuit.  
Protective Devices  
COMPRESSOR PROTECTION  
Overcurrent — Each compressor has internal line break motor  
protection.  
Overtemperature — Each compressor has an internal protector  
to protect it against excessively high discharge gas temperatures.  
High-Pressure Switch — If the high-pressure switch opens, the  
compressor will shut down and the compressor lockout (CLO)  
device will energize to block further compressor operation. The  
high-pressure switch will reset automatically as the refrigerant  
pressure drops below its reset level. The CLO will remain ener-  
gized until manually reset or cooling demand is removed.  
Low-Pressure Switch — If the low-pressure switch opens,  
the compressor will shut down and the compressor lockout  
(CLO) device will energize to block further compressor opera-  
tion. The low-pressure switch will reset automatically as the  
refrigerant pressure rises above its reset level. The CLO will  
remain energized until manually reset or cooling demand is  
removed.  
Freeze Protection Switch — This switch is installed on each  
evaporator coil section to provide protection against continued  
unit operation with a frosted evaporator surface. If the freeze  
protection switch opens, the compressor on this circuit will  
shut down and the compressor lockout (CLO) device will ener-  
gize to block further compressor operation. The freeze protec-  
tion switch will reset as the evaporator tube temperature rises  
above its reset level. The CLO will remain energized until  
manually reset or cooling demand is removed.  
Relief Devices — All units have relief devices to protect  
against damage from excessive pressures (i.e., fire). These  
devices protect the high and low side and are located at the suc-  
tion line service port. Protect joint during brazing operations  
near joint.  
Control Circuit, 24-V — Each control circuit is pro-  
tected against overcurrent by a 3.2 amp circuit breaker.  
Breaker can be reset. If it trips, determine cause of trouble  
before resetting. See Fig. 42-45 for schematics.  
Replacement Parts — A complete list of replacement  
parts may be obtained from any Carrier distributor upon  
request.  
Diagnostic LEDs — The IGC control board has a LED  
for diagnostic purposes. See Unit Troubleshooting section on  
page 57 for more information.  
52  
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Fig. 42 — Typical Low Voltage Control Schematic  
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Fig. 43 — Typical Power Schematic  
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TROUBLESHOOTING  
Unit Troubleshooting — Refer to Tables 33-35 and  
Fig. 46.  
Table 33 — Cooling Service Analysis  
PROBLEM  
CAUSE  
REMEDY  
Compressor and Condenser  
Fan Will Not Start.  
Power failure.  
Fuse blown or circuit breaker tripped.  
Call power company.  
Replace fuse or reset circuit breaker.  
Defective thermostat, contactor, transformer, or control Replace component.  
relay.  
Insufficient line voltage.  
Incorrect or faulty wiring.  
Thermostat setting too high.  
Faulty wiring or loose connections in compressor  
circuit.  
Determine cause and correct.  
Check wiring diagram and rewire correctly.  
Lower thermostat setting below room temperature.  
Check wiring and repair or replace.  
Compressor Will Not Start  
but Condenser Fan Runs.  
Compressor motor burned out, seized, or internal  
overload open.  
Determine cause. Replace compressor.  
Defective overload.  
Determine cause and replace.  
Compressor locked out  
One leg of 3-phase power dead.  
Determine cause for safety trip and reset lockout.  
Replace fuse or reset circuit breaker.  
Determine cause.  
Compressor Cycles  
(other than normally  
satisfying thermostat).  
Refrigerant overcharge or undercharge.  
Recover refrigerant, evacuate system, and recharge to  
nameplate.  
Defective compressor.  
Insufficient line voltage.  
Blocked condenser.  
Replace and determine cause.  
Determine cause and correct.  
Determine cause and correct.  
Determine cause and replace.  
Replace thermostat.  
Replace.  
Locate restriction and remove.  
Replace filter.  
Decrease load or increase unit size.  
Reset thermostat.  
Locate leak, repair, and recharge.  
Recover refrigerant, evacuate system, and recharge.  
Clean coil or remove restriction.  
Replace filter.  
Defective overload.  
Defective thermostat.  
Faulty condenser-fan motor.  
Restriction in refrigerant system.  
Dirty air filter.  
Unit undersized for load.  
Thermostat set too low.  
Low refrigerant charge.  
Air in system.  
Compressor Operates  
continuously.  
Condenser coil dirty or restricted.  
Dirty air filter.  
Excessive Head Pressure.  
Dirty condenser coil.  
Refrigerant overcharged.  
Faulty TXV.  
Clean coil.  
Recover excess refrigerant.  
1. Check TXV bulb mounting and secure tightly to suction line.  
2. Replace TXV if stuck open or closed.  
Air in system.  
Recover refrigerant, evacuate system, and recharge.  
Determine cause and correct.  
Check for leaks, repair, and recharge.  
Remove restriction.  
Condenser air restricted or air short-cycling.  
Low refrigerant charge.  
Restriction in liquid tube.  
High heat load.  
Head Pressure Too Low.  
Excessive Suction Pressure.  
Check for source and eliminate.  
Faulty TXV.  
1. Check TXV bulb mounting and secure tightly to suction line.  
2. Replace TXV if stuck open or closed.  
Refrigerant overcharged.  
Dirty air filter.  
Recover excess refrigerant.  
Replace filter.  
Suction Pressure Too Low.  
Low refrigerant charge.  
Metering device or low side restricted.  
Faulty TXV.  
Check for leaks, repair, and recharge.  
Remove source of restriction.  
1. Check TXV bulb mounting and secure tightly to suction line.  
2. Replace TXV if stuck open or closed.  
Insufficient evaporator airflow.  
Increase air quantity. Check filter and replace if necessary.  
Temperature too low in conditioned area.  
Field-installed filter drier restricted.  
Reset thermostat.  
Replace.  
LEGEND  
TXV — Thermostatic Expansion Valve  
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Table 34 — Gas Heating Service Analysis  
PROBLEM  
CAUSE  
REMEDY  
Burners Will Not Ignite.  
Misaligned spark electrodes.  
Check flame ignition and sensor electrode positioning.  
Adjust as needed.  
No gas at main burners.  
Check gas line for air; purge as necessary. After purging gas  
line of air, allow gas to dissipate for at least 5 minutes before  
attempting to relight unit.  
Check gas valve.  
Water in gas line.  
Drain water and install drip leg to trap water.  
Check power supply, fuses, wiring, and circuit breaker.  
No power to furnace.  
No 24 v power supply to control circuit.  
Check transformer. Transformers with internal overcurrent pro-  
tection require a cool-down period before resetting. Check 24-v  
circuit breaker; reset if necessary.  
Miswired or loose connections.  
Burned-out heat anticipator in thermostat.  
Broken thermostat wires.  
Dirty air filter.  
Check all wiring and wire nut connections.  
Replace thermostat.  
Run continuity check. Replace wires if necessary.  
Clean or replace filter as necessary.  
Inadequate Heating.  
Gas input to unit too low.  
Check gas pressure at manifold. Clock gas meter for input.  
If too low, increase manifold pressure or replace with correct  
orifices.  
Unit undersized for application.  
Restricted airflow.  
Replace with proper unit or add additional unit.  
Clean filter, replace filter, or remove any restrictions.  
Blower speed too low.  
Install alternate motor, if applicable, or adjust pulley to increase  
fan speed.  
Limit switch cycles main burners.  
Too much outdoor air.  
Check rotation of blower, thermostat heat anticipator settings,  
and temperature rise of unit. Adjust as needed.  
Adjust minimum position.  
Check economizer operation.  
Poor Flame Characteristics.  
Burners Will Not Turn Off.  
Incomplete combustion (lack of combustion air)  
results in:  
Aldehyde odors, CO, sooting flame, or floating  
flame.  
Check all screws around flue outlets and burner compartment.  
Tighten as necessary.  
Cracked heat exchanger. Replace heat exchanger.  
Overfired unit — reduce input, change orifices, or adjust gas  
line or manifold pressure.  
Check vent for restriction. Clean as necessary.  
Check orifice to burner alignment.  
Unit is locked into Heating mode for a one minute Wait until mandatory one minute time period has elapsed or  
minimum. power to unit.  
58  
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LEGEND  
IDM  
IGC  
—
—
Induced-Draft Motor  
Integrated Gas Unit Controller  
NOTE: Thermostat Fan Switch in the  
“AUTO” position.  
Fig. 46 — IGC Control (Heating and Cooling)  
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Table 35 — IGC Board LED Alarm Codes  
LED  
FLASH  
CODE  
ACTION TAKEN BY  
RESET METHOD  
CONTROL  
DESCRIPTION  
PROBABLE CAUSE  
On  
Off  
Normal Operation  
Hardware Failure  
—
—
—
—
No gas heating.  
Loss of power to the IGC. Check 5 amp fuse on IGC,  
power to unit, 24V circuit breaker, transformer, and  
wiring to the IGC.  
1 Flash Indoor Fan On/Off Delay  
Modified  
5 seconds subtracted from Power reset.  
On delay.  
5 seconds added to Off  
delay (3 min max).  
High temperature limit switch opens during heat  
exchanger warm-up period before fan-on delay  
expires.  
High temperature limit switch opens within  
10 minutes of heat call (W) Off.  
See Limit Switch Fault.  
2 Flashes Limit Switch Fault  
3 Flashes Flame Sense Fault  
Gas valve and igniter Off.  
Limit switch closed, or  
High temperature limit switch is open. Check the oper-  
ation of the indoor (evaporator) fan motor. Ensure that  
the supply-air temperature rise is within the range on  
the unit nameplate. Check wiring and limit switch  
operation.  
Indoor fan and inducer On. heat call (W) Off.  
Indoor fan and inducer On. Flame sense normal.  
The IGC sensed a flame when the gas valve should be  
Power reset for LED reset. closed. Check wiring, flame sensor, and gas valve  
operation.  
4 Flashes Four Consecutive Limit  
No gas heating.  
No gas heating.  
Heat call (W) Off.  
4 consecutive limit switch faults within a single call for  
Switch Fault  
Power reset for LED reset. heat. See Limit Switch Fault.  
5 Flashes Ignition Fault  
Heat call (W) Off.  
Unit unsuccessfully attempted ignition for 15 minutes.  
Power reset for LED reset. Check igniter and flame sensor electrode spacing,  
gaps, etc. Check flame sense and igniter wiring. Check  
gas valve operation and gas supply.  
6 Flashes Induced Draft Motor Fault  
If heat off: no gas heating. Inducer sense normal, or Inducer sense On when heat call Off, or inducer sense  
If heat on: gas valve Off and heat call (W) Off.  
inducer On.  
Off when heat call On. Check wiring, voltage, and  
operation of IGC motor. Check speed sensor wiring to  
IGC.  
7 Flashes Rollout Switch Lockout  
8 Flashes Internal Control Lockout  
Gas valve and igniter Off.  
Indoor fan and inducer On.  
Power reset.  
Power reset.  
Rollout switch has opened. Check gas valve opera-  
tion. Check induced-draft blower wheel is properly  
secured to motor shaft.  
IGC has sensed internal hardware or software error. If  
fault is not cleared by resetting 24 v power, replace the  
IGC.  
No gas heating.  
9 Flashes Temporary Software Lockout No gas heating.  
1 hour auto reset, or  
power reset.  
Electrical interference is disrupting the IGC software.  
LEGEND  
NOTES:  
1. There is a 3-second pause between alarm code displays.  
2. If more than one alarm code exists, all applicable alarm codes will be  
displayed in numerical sequence.  
IGC — Integrated Gas Unit Control  
LED — Light-Emitting Diode  
3. Alarm codes on the IGC will be lost if power to the unit is interrupted.  
10. Set DCV maximum position potentiometer fully CW  
(clockwise).  
11. Set enthalpy potentiometer to D.  
EconoMi$er IV Troubleshooting  
ECONOMI$ER IV PREPARATION — This procedure is  
used to prepare the EconoMi$er IV for troubleshooting. No  
troubleshooting or testing is done by performing the following  
procedure.  
NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm  
resistor, and a 5.6 kilo-ohm resistor which are not supplied  
with the EconoMi$er IV.  
12. Apply power (24 vac) to terminals TR and TR1.  
DIFFERENTIAL ENTHALPY — To check differential  
enthalpy:  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
IMPORTANT: Be sure to record the positions of all poten-  
tiometers before starting troubleshooting.  
2. Place 620-ohm resistor across SO and +.  
3. Place 1.2 kilo-ohm resistor across SR and +. The Free  
Cool LED should be lit.  
4. Remove 620-ohm resistor across SO and +. The Free  
Cool LED should turn off.  
5. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
1. Disconnect power at TR and TR1. All LEDs should be  
off. Exhaust fan contacts should be open.  
2. Disconnect device at P and P1.  
3. Jumper P to P1.  
4. Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor  
across T and T1.  
5. Jumper TR to 1.  
6. Jumper TR to N.  
7. If connected, remove sensor from terminals SO and +.  
Connect 1.2 kilo-ohm 4074EJM checkout resistor across  
terminals SO and +.  
8. Put 620-ohm resistor across terminals SR and +.  
9. Set minimum position, DCV set point, and exhaust  
potentiometers fully CCW (counterclockwise).  
SINGLE ENTHALPY — To check single enthalpy:  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
2. Set the enthalpy potentiometer to A (fully CCW). The  
Free Cool LED should be lit.  
3. Set the enthalpy potentiometer to D (fully CW). The Free  
Cool LED should turn off.  
4. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
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DCV (Demand Controlled Ventilation) AND POWER  
EXHAUST — To check DCV and Power Exhaust:  
5. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
2. Ensure terminals AQ and AQ1 are open. The LED for  
both DCV and Exhaust should be off. The actuator  
should be fully closed.  
ECONOMI$ER IV TROUBLESHOOTING COMPLE-  
TION — This procedure is used to return the EconoMi$er IV  
to operation. No troubleshooting or testing is done by perform-  
ing the following procedure.  
1. Disconnect power at TR and TR1.  
3. Connect a 9-v battery to AQ (positive node) and AQ1  
(negative node). The LED for both DCV and Exhaust  
should turn on. The actuator should drive to between 90  
and 95% open.  
4. Turn the Exhaust potentiometer CW until the Exhaust  
LED turns off. The LED should turn off when the  
potentiometer is approximately 90%. The actuator should  
remain in position.  
5. Turn the DCV set point potentiometer CW until the DCV  
LED turns off. The DCV LED should turn off when the  
potentiometer is approximately 9 v. The actuator should  
drive fully closed.  
2. Set enthalpy potentiometer to previous setting.  
3. Set DCV maximum position potentiometer to previous  
setting.  
4. Set minimum position, DCV set point, and exhaust  
potentiometers to previous settings.  
5. Remove 620-ohm resistor from terminals SR and +.  
6. Remove 1.2 kilo-ohm checkout resistor from terminals  
SO and +. If used, reconnect sensor from terminals SO and  
+.  
7. Remove jumper from TR to N.  
8. Remove jumper from TR to 1.  
6. Turn the DCV and Exhaust potentiometers CCW until  
the Exhaust LED turns on. The exhaust contacts will  
close 30 to 120 seconds after the Exhaust LED turns on.  
7. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect  
wires at T and T1.  
10. Remove jumper from P to P1. Reconnect device at P and  
P1.  
11. Apply power (24 vac) to terminals TR and TR1.  
DCV MINIMUM AND MAXIMUM POSITION — To check  
the DCV minimum and maximum position:  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
Phase Loss Protection — The phase loss protection  
option will monitor the three-phase electrical system to provide  
phase reversal and phase loss protection.  
PHASE REVERSAL PROTECTION — If the control sens-  
es an incorrect phase relationship, the relay (K1) will be de-  
energized (opening its contact). If the phase relationship is  
correct, the relay will be energized. The control has a self-  
bypass function after a pre-set time. If the control determines  
that the three phases stay in a correct relationship for 10 con-  
secutive minutes, the relay will stay energized regardless of the  
phase sequence of three inputs as long as 24-vac control  
voltage is applied. This self-bypass function will be reset if all  
three phases are restored in a phase loss event.  
PHASE LOSS PROTECTION — If the reverse rotation  
board senses any one of the three phase inputs has no AC  
voltage, the relay will be deenergized (opening its contact).  
This protection is always active as long as 24-vac control volt-  
age is applied, and is not affected by the self bypass function of  
the phase sequence monitoring function. However, in the event  
of phase loss, the relay will be re-energized only if all three  
phases are restored and the three phases are in the correct  
sequence.  
2. Connect a 9-v battery to AQ (positive node) and AQ1  
(negative node). The DCV LED should turn on. The  
actuator should drive to between 90 and 95% open.  
3. Turn the DCV Maximum Position potentiometer to mid-  
point. The actuator should drive to between 20 and 80%  
open.  
4. Turn the DCV Maximum Position potentiometer to fully  
CCW. The actuator should drive fully closed.  
5. Turn the Minimum Position potentiometer to midpoint.  
The actuator should drive to between 20 and 80% open.  
6. Turn the Minimum Position Potentiometer fully CW. The  
actuator should drive fully open.  
7. Remove the jumper from TR and N. The actuator should  
drive fully closed.  
8. Return EconoMi$er IV settings and wiring to normal  
after completing troubleshooting.  
MIXED-AIR INPUT — To check mixed-air input:  
A red LED is provided to indicate the function of the board.  
See the table below.  
1. Make sure EconoMi$er IV preparation procedure has  
been performed.  
2. Set the Enthalpy potentiometer to A. The Free Cool LED  
turns on. The actuator should drive to between 20 and  
80% open.  
3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.  
The actuator should drive fully open.  
LED STATUS  
On Continuously  
FUNCTION  
Relay contact closed (normal operation).  
Relay contact open (phase loss or phase  
reversal has occurred) — No power will be  
supplied to the control system.  
Blinking  
Off  
24 vac control power not present (off).  
4. Remove the jumper across T and T1. The actuator should  
drive fully closed.  
61  
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Copyright 2005 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 111 Catalog No. 534-80211 Printed in U.S.A. Form 48PG-10SI Pg 62 9-05 Replaces: New  
Book 1  
4
Tab 1a 6a  
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UNIT START-UP CHECKLIST  
MODEL NO.:___________________________________________  
SERIAL NO.:______________________________________________  
TECHNICIAN: ____________________________________________  
DATE:_________________________________________________  
I. PRE-START-UP:  
VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT  
VERIFY INSTALLATION OF OUTDOOR AIR HOOD  
VERIFY INSTALLATION OF FLUE EXHAUST AND INLET HOOD  
VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS  
VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT  
VERIFY GAS PRESSURE TO UNIT GAS VALVE IS WITHIN SPECIFIED RANGE  
CHECK GAS PIPING FOR LEAKS  
CHECK THAT INDOOR-AIR FILTERS ARE CLEAN AND IN PLACE  
CHECK THAT OUTDOOR AIR INLET SCREENS ARE IN PLACE  
VERIFY THAT UNIT IS LEVEL  
CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW  
IS TIGHT  
VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED  
VERIFY THAT SCROLL COMPRESSORS ARE ROTATING IN THE CORRECT DIRECTION  
VERIFY INSTALLATION OF THERMOSTAT  
VERIFY THAT CRANKCASE HEATERS HAVE BEEN ENERGIZED FOR AT LEAST 24 HOURS  
II. START-UP  
ELECTRICAL  
SUPPLY VOLTAGE  
L1-L2  
L2-L3  
L3-L1  
COMPRESSOR AMPS — COMPRESSOR A1  
— COMPRESSOR A2  
L1  
L1  
L1  
L1  
L2  
L2  
L2  
L2  
L3  
L3  
L3  
L3  
— COMPRESSOR B1  
SUPPLY FAN AMPS  
TEMPERATURES  
OUTDOOR-AIR TEMPERATURE  
RETURN-AIR TEMPERATURE  
COOLING SUPPLY AIR  
F DB (Dry Bulb)  
F DB  
F WB (Wet Bulb)  
F
F
GAS HEAT SUPPLY AIR  
PRESSURES  
GAS INLET PRESSURE  
GAS MANIFOLD PRESSURE STAGE NO. 1  
REFRIGERANT SUCTION  
IN. WG  
IN. WG  
PSIG  
STAGE NO. 2  
IN. WG  
CIRCUIT A  
CIRCUIT B  
PSIG  
REFRIGERANT DISCHARGE CIRCUIT A  
CIRCUIT B  
PSIG  
PSIG  
VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 50  
GENERAL  
ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS  
Copyright 2005 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
1
4
PC 111  
Catalog No. 534-80211  
Printed in U.S.A.  
Form 48PG-10SI  
Pg CL-1  
9-05  
Replaces: New  
Tab  
1a 6a  
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