Carrier 38AKS013 024 User Manual

38AKS013-024  
Air-Cooled Condensing Units  
50/60 Hz  
Installation, Start-Up and  
Service Instructions  
Only trained, qualified installers and service mechanics  
CONTENTS  
should install, start-up, and service this equipment (Fig. 1).  
Page  
Untrained personnel can perform basic maintenance func-  
tions such as cleaning coils. All other operations should be  
performed by trained service personnel.  
When working on the equipment, observe precautions in  
the literature and on tags, stickers, and labels attached to the  
equipment.  
Follow all safety codes. Wear safety glasses and work gloves.  
Keep quenching cloth and fire extinguisher nearby when braz-  
ing. Use care in handling, rigging, and setting bulky equip-  
ment.  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12  
Step 1 — Complete Pre-Installation  
Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Step 2 — Rig and Mount the Unit . . . . . . . . . . . . . 8  
Step 3 — Complete Refrigerant Piping  
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Step 4 — Install Accessories . . . . . . . . . . . . . . . . 10  
Step 5 — Complete Electrical  
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Leak Test and Dehydration . . . . . . . . . . . . . . . . . . 12  
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . 12  
Preliminary Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
ELECTRIC SHOCK HAZARD  
Separate power sources (main and control  
power circuits) are used for these units. Be  
sure both main and control power circuits are  
disconnected before servicing.  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-16  
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Preliminary Oil Charge . . . . . . . . . . . . . . . . . . . . . . 13  
Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Adjust Refrigerant Charge . . . . . . . . . . . . . . . . . . . 13  
Check Compressor Oil Level . . . . . . . . . . . . . . . . 13  
Final Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
INSTALLATION  
Step 1 — Complete Pre-Installation Checks  
OPERATING SEQUENCE . . . . . . . . . . . . . . . . . . . . 17  
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Fan Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Winter Start Control . . . . . . . . . . . . . . . . . . . . . . . . . 17  
UNCRATE UNIT — Remove unit packaging except for the  
top skid assembly, which should be left in place until after  
the unit is rigged into its final location.  
INSPECT SHIPMENT — File claim with shipping com-  
pany if shipment is damaged or incomplete.  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-19  
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . 17  
Time GuardII Circuit . . . . . . . . . . . . . . . . . . . . . . . 17  
Winter Start Control . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . 18  
High-Pressure Switches . . . . . . . . . . . . . . . . . . . . . 18  
Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . 18  
Outdoor Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Cleaning Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
CONSIDER SYSTEM REQUIREMENTS  
• Consult local building codes and National Electrical Code  
(NEC, U.S.A.) for special installation requirements.  
• Allow sufficient space for airflow clearance, wiring,  
refrigerant piping, and servicing unit. See Fig. 1. See  
Fig. 2 for unit component locations.  
• Locate unit so that outdoor coil (condenser) airflow is un-  
restricted on all sides and above.  
• Unit may be mounted on a level pad directly on the base  
channels or mounted on raised pads at support points. See  
Tables 1A-1D for unit operating weights. See  
Table 2 for weight distribution based on recommended sup-  
port points.  
NOTE: If vibration isolators are required for a particular  
installation, use the data in Table 2 to make the proper  
selection.  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 20,21  
START-UP CHECKLIST . . . . . . . . . . . . . . . . CL-1,CL-2  
SAFETY CONSIDERATIONS  
Installing, starting up, and servicing air-conditioning equip-  
ment can be hazardous due to system pressures, electrical  
components, and equipment location (roofs, elevated struc-  
tures, etc.).  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 563-701 Printed in U.S.A. Form 38AKS-3SI Pg 1 9-98 Replaces: 38AKS-2SI  
Tab 3a 2a  
4
NOTE: Service areas — Allow 3 ft (914 mm) on both sides and 2 ft (610 mm)  
on both ends of unit for servicing.  
Fig. 1 — Dimensions  
Table 1A — Physical Data (English, 60 Hz)  
UNIT 38AKS  
013  
014  
016  
024  
OPERATING WEIGHT (lb)  
With Aluminum-Fin Coil  
With Copper-Fin Coil  
732  
825  
779  
919  
789  
929  
900  
1040  
REFRIGERANT*  
Shipping Charge (lb)  
Operating Charge, Typical (lb)†  
R-22  
2.1  
22  
3.1  
23  
3.1  
23  
3.1  
28  
COMPRESSOR  
Model  
Reciprocating, Semi-Hermetic  
06DD824  
6
06DD328  
6
06DD537  
06EA250  
4
No. Cylinders  
Speed (rpm)  
Capacity Steps (%)  
Accessory  
6
1750  
33**,66,100  
66,100  
33**,66,100  
66,100  
33**,66,100  
66,100  
50,100  
Standard  
Crankcase Heater Watts  
Unloader Setting (psig)  
Load  
125  
70 ± 1  
60 ± 2  
Unload  
OIL CHARGE (pt)  
10  
10  
10  
15.5  
CONDENSER FANS  
Quantity...Diameter (in.)  
Nominal Hp  
Axial Flow, Direct Drive  
2...26  
1
2
Nominal Airflow (cfm, total)  
Speed (rpm)  
11,000  
1,075  
1,460  
Watts (total)  
CONDENSER COIL  
Rows...Fins/in.  
Total Face Area (sq ft)  
Storage Capacity (lb)††  
Copper Tubes, Aluminum Fins  
2...15  
29.2  
27.2  
3...15  
29.2  
40.3  
3...15  
29.2  
39.8  
3...15  
29.2  
39.8  
CONTROLS  
Pressurestat (psig)  
High Pressure  
Cutout  
395 ± 10  
295 ± 20  
Cut-in  
Low Pressure  
Cutout  
Cut-in  
27 ± 4  
67 + 7  
FAN CYCLING CONTROLS  
No 2 Fan:  
Close (psig)  
255 ± 10  
160 ± 10  
Open (psig)  
PRESSURE RELIEF  
Location  
Temperature (F)  
Fusible Plug  
Compressor  
200  
Compressor  
200  
Compressor  
200  
Liquid Line  
210  
PIPING CONNECTIONS (in. ODM)  
Suction  
118  
138  
138  
158  
5
3
Liquid  
Hot Gas Stub  
8
8
*Unit is factory supplied with holding charge only.  
†With 25 ft of interconnecting piping. Operating charge is approximate for maximum system capacity.  
**Indicates capacity step (%) with electric unloader accessory.  
††Storage capacity is measured at liquid saturated temperatures of 125 F for 38AKS013, 123 F for  
38AKS014, and 130 F for 38AKS016 and 024.  
4
Table 1B — Physical Data (SI, 60 Hz)  
UNIT 38AKS  
013  
014  
016  
024  
OPERATING WEIGHT (kg)  
With Aluminum-Fin Coil  
With Copper-Fin Coil  
332  
374  
353  
417  
358  
421  
408  
472  
REFRIGERANT*  
Shipping Charge (kg)  
Operating Charge, Typical (kg)†  
R-22  
0.95  
10.0  
1.40  
10.4  
1.40  
10.4  
1.40  
12.7  
COMPRESSOR  
Model  
Reciprocating, Semi-Hermetic  
06DD824  
6
06DD328  
6
06DD537  
06EA250  
4
No. Cylinders  
Speed (r/s)  
6
29.2  
Capacity Steps  
Accessory  
Standard  
33**,66,100  
66,100  
33**,66,100  
66,100  
33**,66,100  
66,100  
50,100  
Crankcase Heater Watts  
Unloader Setting (kPa)  
Load  
125  
483 ± 6.9  
414 ± 13.8  
Unload  
OIL CHARGE (L)  
4.73  
4.73  
4.73  
7.33  
CONDENSER FANS  
Quantity...Diameter (mm)  
Nominal kW  
Axial Flow, Direct Drive  
2...660  
0.37  
Nominal Airflow (L/s, total)  
Speed (r/s)  
5566  
17.9  
1460  
Watts (total)  
CONDENSER COIL  
Rows...Fins/m  
Total Face Area (sq m)  
Storage Capacity (kg)††  
Copper Tubes, Aluminum Fins  
2...590  
2.71  
12.3  
3...590  
2.71  
3...590  
2.71  
3...590  
2.71  
18.1  
18.3  
18.1  
CONTROLS  
Pressurestat (kPa)  
High Pressure  
Cutout  
2724 ± 69  
2034 ± 138  
Cut-in  
Low Pressure  
Cutout  
Cut-in  
186 ± 28  
462 + 48  
FAN CYCLING CONTROLS  
No 2 Fan:  
Close (kPa)  
1758 ± 69  
1103 ± 69  
Open (kPa)  
PRESSURE RELIEF  
Location  
Temperature (C)  
Fusible Plug  
Compressor  
93.3  
Compressor  
93.3  
Compressor  
93.3  
Liquid Line  
98.9  
PIPING CONNECTIONS (in. ODM)  
Suction  
118  
138  
138  
158  
5
3
Liquid  
Hot Gas Stub  
8
8
*Unit is factory supplied with holding charge only.  
†With 7.6 m of interconnecting piping. Operating charge is approximate for maximum system capacity.  
**Indicates capacity step (%) with electric unloader accessory.  
††Storage capacity is measured at liquid saturated temperatures of 51.7 C for 38AKS013, 50.6 C for  
38AKS014, and 54.4 C for 38AKS016 and 024.  
5
Table 1C — Physical Data (English, 50 Hz)  
UNIT 38AKS  
013  
014  
016  
024  
OPERATING WEIGHT (lb)  
With Aluminum-Fin Coil  
With Copper-Fin Coil  
732  
825  
779  
919  
789  
929  
900  
1040  
REFRIGERANT*  
Shipping Charge (lb)  
Operating Charge, Typical (lb)†  
R-22  
2.1  
22  
3.1  
23  
3.1  
23  
3.1  
28  
COMPRESSOR  
Model  
Reciprocating, Semi-Hermetic  
06DD824  
6
06DD328  
6
06DD537  
06EA250  
4
No. Cylinders  
Speed (rpm)  
Capacity Steps  
Accessory  
6
1450  
33**,66,100  
66,100  
33**,66,100  
66,100  
33**,66,100  
66,100  
50,100  
Standard  
Crankcase Heater Watts  
Unloader Setting (psig)  
Load  
125  
70 ± 1  
60 ± 2  
Unload  
OIL CHARGE (pt)  
10  
10  
10  
15.5  
CONDENSER FANS  
Quantity...Diameter (in.)  
Nominal Hp  
Axial Flow, Direct Drive  
2...26  
1
2
Nominal Airflow (cfm, total)  
Speed (rpm)  
9210  
900  
Watts (total)  
1050  
CONDENSER COIL  
Rows...Fins/in.  
Total Face Area (sq ft)  
Storage Capacity (lb)††  
Copper Tubes, Aluminum Fins  
2...15  
29.2  
27.2  
3...15  
29.2  
40.3  
3...15  
29.2  
39.8  
3...15  
29.2  
39.8  
CONTROLS  
Pressurestat (psig)  
High Pressure  
Cutout  
395 ± 10  
295 ± 20  
Cut-in  
Low Pressure  
Cutout  
Cut-in  
27 ± 4  
67 + 7  
FAN CYCLING CONTROLS  
No 2 Fan:  
Close (psig)  
255 ± 10  
160 ± 10  
Open (psig)  
PRESSURE RELIEF  
Location  
Temperature (F)  
Fusible Plug  
Compressor  
200  
Compressor  
200  
Compressor  
200  
Liquid Line  
210  
PIPING CONNECTIONS (in. ODM)  
Suction  
118  
138  
138  
158  
5
3
Liquid  
Hot Gas Stub  
8
8
*Unit is factory supplied with holding charge only.  
†With 25 ft of interconnecting piping. Operating charge is approximate for maximum system capacity.  
**Indicates capacity step (%) with electric unloader accessory.  
††Storage capacity is measured at liquid saturated temperatures of 125 F for 38AKS013, 123 F for  
38AKS014, and 130 F for 38AKS016 and 024.  
6
Table 1D — Physical Data (SI, 50 Hz)  
UNIT 38AKS  
013  
014  
016  
024  
OPERATING WEIGHT (kg)  
With Aluminum-Fin Coil  
With Copper-Fin Coil  
332  
374  
353  
417  
358  
421  
408  
472  
REFRIGERANT*  
Shipping Charge (kg)  
Operating Charge, Typical (kg)†  
R-22  
0.95  
10.0  
1.40  
10.4  
1.40  
10.4  
1.40  
12.7  
COMPRESSOR  
Model  
Reciprocating, Semi-Hermetic  
06DD824  
6
06DD328  
6
06DD537  
06EA250  
4
No. Cylinders  
Speed (r/s)  
6
24.2  
Capacity Steps  
Accessory  
Standard  
33**,66,100  
66,100  
33**,66,100  
66,100  
33**,66,100  
66,100  
50,100  
Crankcase Heater Watts  
Unloader Setting (kPa)  
Load  
125  
483 ± 6.9  
414 ± 13.8  
Unload  
OIL CHARGE (L)  
4.73  
4.73  
4.73  
7.33  
CONDENSER FANS  
Quantity...Diameter (mm)  
Nominal kW  
Axial Flow, Direct Drive  
2...660  
0.37  
Nominal Airflow (L/s, total)  
Speed (r/s)  
4660  
15.0  
1050  
Watts (total)  
CONDENSER COIL  
Rows...Fins/m  
Total Face Area (sq m)  
Storage Capacity (kg)††  
Copper Tubes, Aluminum Fins  
2...590  
2.71  
12.3  
3...590  
2.71  
3...590  
2.71  
3...590  
2.71  
18.1  
18.3  
18.1  
CONTROLS  
Pressurestat (kPa)  
High Pressure  
Cutout  
2724 ± 69  
2034 ± 138  
Cut-in  
Low Pressure  
Cutout  
Cut-in  
186 ± 28  
462 + 48  
FAN CYCLING CONTROLS  
No 2 Fan:  
Close (kPa)  
1758 ± 69  
1103 ± 69  
Open (kPa)  
PRESSURE RELIEF  
Location  
Temperature (C)  
Fusible Plug  
Compressor  
93.3  
Compressor  
93.3  
Compressor  
93.3  
Liquid Line  
98.9  
PIPING CONNECTIONS (in. ODM)  
Suction  
118  
138  
138  
158  
5
3
Liquid  
Hot Gas Stub  
8
8
*Unit is factory supplied with holding charge only.  
†With 7.6 m of interconnecting piping. Operating charge is approximate for maximum system capacity.  
**Indicates capacity step (%) with electric unloader accessory.  
††Storage capacity is measured at liquid saturated temperatures of 51.7 C for 38AKS013, 50.6 C for  
38AKS014, and 54.4 C for 38AKS016 and 024.  
7
Table 2 — Weight Distribution  
WEIGHT  
Support Point  
UNIT  
38AKS  
Total  
Operating  
A
B
C
D
E
F
lb  
732 332  
825 374 119 54 116 53 115 52 157 71 159 72 159 72  
779 353 95 43 94 43 94 43 164 74 166 75 166 75  
919 417 131 59 129 59 128 58 176 80 177 80 178 81  
789 358 95 43 95 43 96 44 167 76 168 76 168 76  
kg  
lb  
kg  
lb  
kg  
lb  
kg  
lb  
kg  
lb  
kg  
lb  
kg  
013  
94 43  
93 42  
93 42 149 68 151 68 152 69  
013C  
014  
014C  
016  
016C  
024  
929 421 131 59 130 59 130 59 178 81 180 82 180 82  
900 408 119 54 114 52 113 51 179 81 185 84 190 86  
1040 472 155 70 150 68 146 66 191 87 196 89 202 92  
024C  
Step 2 — Rig and Mount the Unit  
Step  
Connections  
3
Complete Refrigerant Piping  
IMPORTANT: A refrigerant receiver is not provided with  
the unit. Do not install a receiver.  
Be sure unit panels are securely in place prior to  
rigging.  
SIZE REFRIGERANT LINES — Consider the length of pip-  
ing required between outdoor unit and indoor unit (evapo-  
rator), the amount of liquid lift, and compressor oil return.  
See Tables 3-5B and also refer to Part 3 of Carrier System  
Design Manual and E20-IIsoftware for design details and  
line sizing. Refer to indoor unit installation instructions for  
additional information.  
RIGGING — These units are designed for overhead rigging  
only. For this purpose, the transverse base channels extend  
beyond the sides of the unit, with holes provided in the end  
plates to attach cables or hooks. Rig with top skid packaging  
assembly in place to prevent unit damage by the rigging cable.  
As further protection for the coil faces, plywood sheets can  
be placed against the sides of the unit, behind the cables.  
Run the cables to a central suspension point so that the angle  
from the horizontal is not less than 45 degrees. Raise and set  
the unit down carefully.  
NOTE: Use the piping data in Tables 3-5B as a general guide  
only. For more precise calculations, refer to Carrier System  
Design manual or E20-II software.  
Condensing units with multiple-step unloading may  
require double suction risers to assure proper oil return at  
minimum load operating condition. See Tables 4A-5B and  
Fig. 4. Reduction of evaporator coil surface should be ana-  
lyzed to provide sufficient refrigerant velocity to return oil  
to the compressor. Liquid line solenoid valves may be used  
in certain situations to accomplish this. Hot gas bypass, if  
used, should be introduced before the evaporator.  
If it is necessary to roll the unit into position, mount  
the unit on longitudinal rails, using a minimum of 3 rollers.  
Apply force to the rails, not the unit. If the unit is to be skid-  
ded into position, place it on a large pad and drag it by the  
pad. Do not apply any force to the unit.  
Raise from above to lift unit from the rails or pad when  
unit is in final position.  
COMPRESSOR MOUNTING — As shipped, the compres-  
sor is held tightly in place by self-locking bolts. Before start-  
ing unit, loosen self-locking bolts until the snubber washer  
can be moved sideways with finger pressure. Do not  
remove shipping bolts. See Fig. 3.  
Note that refrigerant suction piping should be insulated.  
Table 3 — Liquid Line Data  
MAXIMUM  
ALLOWABLE  
LIQUID LINE  
LIQUID LIFT  
ft (m)  
UNIT  
Maximum Maximum Filter Drier  
38AKS  
Allowable Allowable  
and  
60 Hz  
50 Hz Pressure  
Temp.  
Loss  
F (C)  
Sight Glass  
Flare Conn.*  
in. (mm)  
Drop  
psig (kPa)  
013  
014  
016  
52 (15.8)  
67 (20.4)  
82 (25.0  
5
7 (48.3)  
2 (1.1)  
8  
(15.88)  
024 87 (26.5) 86 (26)  
*Inlet and outlet.  
NOTE: Data shown is for units operating at 45 F (7.2 C) saturated  
suction and 95 F (35 C) entering air.  
Fig. 3 — Compressor Mounting  
8
Table 4A — Refrigerant Piping Sizes — 60 Hz Units  
Table 5A — Refrigerant Piping Sizes — 50 Hz Units  
LENGTH OF INTERCONNECTING PIPING, FT (M)  
LENGTH OF INTERCONNECTING PIPING, FT (M)  
0-15  
(0-4.5)  
15-25  
25-50  
50-75  
75-100  
(23-30)  
0-15  
(0-4.5)  
15-25  
25-50  
50-75  
75-100  
(23-30)  
COND  
UNIT  
38AKS  
UNIT  
38AKS  
(4.5-7.5)  
(7.5-15)  
(15-23)  
(4.5-7.5)  
(7.5-15)  
(15-23)  
Line Size (in. OD)  
Line Size (in. OD)  
L
S
S
S
S
S
S
S
S
S
S
1
1
1
5
013  
014  
016  
024  
2
2
2
8
118  
118  
138  
158  
118  
138  
138  
158  
138  
138  
158  
158  
138  
158  
158  
218  
*
*
*
013  
014  
016  
024  
118  
118  
138  
138  
118  
138  
138  
138  
138  
138  
158  
158  
138  
158  
158  
158  
138  
158  
158  
158  
*
*
*
158  
158  
218  
*
*
*
*
218  
*Requires a double suction riser if 2 unloaders are used and the evapo-  
rator is below the condensing unit. See Table 5B and Fig. 4 for more  
information.  
LEGEND  
L
S
Liquid  
Suction  
NOTES:  
Close-coupled.  
1. Pipe sizes are based on 2 F (1.1 C) max loss for liquid lines and  
1.5 F (0.8 C) max loss for suction lines, selected at maximum length  
for each interval and for matched systems at nominal rating con-  
ditions, nominal airflow.  
*Requires a double suction riser if 2 unloaders are used and the  
evaporator is below the condensing unit. See Table 4B and Fig. 4  
for more information.  
2. Pipe sizes are based on an equivalent length equal to the maxi-  
mum length of interconnecting piping plus 50% for fittings. A more  
accurate estimate may result in smaller sizes.  
3. See Table 4A for line size conversion to mm.  
NOTES:  
1. Pipe sizes are based on a 2 F (1.1 C) loss for liquid lines and a  
1.5 F (0.8 C) loss for suction lines.  
2. Pipe sizes are based on an equivalent length equal to the maxi-  
mum length of interconnecting piping plus 50% for fittings. A more  
accurate estimate may result in smaller sizes.  
3. Line size conversion to mm:  
Table 5B — Refrigerant Piping Sizes,  
Double Suction Risers — 50 Hz Units  
in.  
mm  
1
5
7
2
8
8
12.7  
15.9  
22.2  
28.6  
34.9  
41.3  
54.0  
LENGTH OF INTERCONNECTING PIPING FT (M)  
118  
138  
158  
218  
25-50  
(7.5-15)  
50-75  
(15-23)  
75-100  
(23-30)  
COND  
UNIT  
38AKS  
Line Size (in. OD)  
A
B
C
A
B
C
A
B
C
013  
014  
016  
118  
118  
118  
138  
138  
138  
158  
158  
158  
118  
118  
138  
138  
158  
158  
Table 4B — Refrigerant Piping Sizes,  
Double Suction Risers — 60 Hz Units  
118  
138  
158  
NOTES:  
1. See Fig. 4 for ‘‘A,’’ ‘‘B,’’ and ‘‘C’’ dimensions.  
2. Double suction risers are not required for unit size 024.  
3. See Table 4A for line size conversion to mm.  
LENGTH OF INTERCONNECTING PIPING, FT (M)  
50-75  
75-100  
(23-30)  
UNIT  
(15-23)  
38AKS  
Line Size (in. OD)  
A
B
C
A
B
C
013  
014  
016  
118  
138  
158  
118  
118  
138  
138  
138  
158  
158  
158  
218  
NOTES:  
1. See Fig. 4 for ‘‘A,’’ ‘‘B,’’ and ‘‘C’’ dimensions.  
2. No double suction risers are needed for unit size 024.  
3. See Table 4A for line size conversion to mm.  
LEGEND  
Suction Riser Without Trap  
Suction Riser With Trap  
Suction Line to Condensing Unit  
Short Vertical Riser Into  
Condensing Unit:  
38AKS013  
38AKS014,016 — 138 in. OD  
38AKS024  
— 158 in. OD  
— 118 in. OD  
Fig. 4 — Suction Line Piping  
9
INSTALL FILTER DRIER(S) AND MOISTURE INDICA-  
TOR(S) — Every unit should have a filter drier and liquid-  
moisture indicator (sight glass). In some applications, depending  
on space and convenience requirements, it may be desirable  
to install 2 filter driers and sight glasses. One filter drier and  
sight glass may be installed at A locations in Fig. 5. Or, 2  
filter driers and sight glasses may be installed at B locations.  
2. Remove 14-in. flare cap from liquid valve Schrader port.  
3. Attach refrigerant recovery device and recover holding  
charge.  
4. Remove runaround loop.  
5. Install a field-supplied liquid moisture indicator in the pip-  
ing immediately leaving outdoor unit.  
6. If necessary, install field-supplied thermostatic expan-  
sion valve(s) (TXVs) in air handler.  
If 2 TXVs are installed and two-step cooling is desired,  
install field-supplied liquid line solenoid valve ahead of the  
upper TXV (see Fig. 5).  
Select the filter drier for maximum unit capacity and mini-  
mum pressure drop. Complete the refrigerant piping from  
indoor unit to outdoor unit before opening the liquid and suc-  
tion lines at the outdoor unit.  
PROVIDE SAFETY RELIEF — A fusible plug is located  
on the compressor crankcase or in the liquid line (Fig. 6).  
Do not cap this plug. If local code requires additional safety  
devices, install them as directed.  
TXV — Thermostatic Expansion Valve  
Fig. 5 — Location of Sight Glass(es)  
and Filter Drier(s)  
NOTE: 38AKS024 has a fusible plug in the liquid line.  
Fig. 6 — Location of Fusible Plug (38AKS)  
INSTALL LIQUID LINE SOLENOID VALVE — SOLE-  
NOID DROP — It is recommended that a solenoid valve be  
placed in the main liquid line (see Fig. 5) between condens-  
ing unit (38AKS) and fan coil (40RM, 39 Series). (A liquid  
line solenoid valve is required when the liquid line length  
exceeds 100 ft [30.5 m] or when the condensing unit is con-  
nected to a chiller barrel in a built-up chiller system.) This  
valve prevents refrigerant migration (which causes oil dilu-  
tion) to the compressor during the off cycle at low outdoor  
ambient temperatures. The solenoid should be wired in par-  
allel with the compressor contactor coil. This means of elec-  
trical control is referred to as solenoid drop control.  
Step 4 — Install Accessories — Field install  
accessories such as winter start control or low-ambient con-  
trol before proceeding with wiring. Refer to the instructions  
shipped with the accessory.  
Step 5 — Complete Electrical Connections  
POWER WIRING — Unit is factory wired for voltage shown  
on nameplate. Provide adequate fused disconnect switch within  
sight from unit and readily accessible from unit, but out of  
the reach of children. Lock switch open (off) to prevent power  
from being turned on while unit is being serviced. Dis-  
connect switch, fuses, and field wiring must comply with  
national and local code requirements. See Tables 6A and 6B.  
Route power wires through opening in unit end panel to  
connection in unit control box as shown on unit label dia-  
gram and in Fig. 7. Unit must be grounded.  
INSTALL LIQUID LINE SOLENOID VALVE (Optional)  
— CAPACITY CONTROL — If 2-step cooling is desired,  
place a solenoid valve in the location shown in Fig. 5.  
MAKE PIPING CONNECTIONS — Do not remove run-  
around loop from suction and liquid line stubs in the com-  
pressor compartment until piping connections are ready to  
be made. Pass nitrogen or other inert gas through piping while  
brazing to prevent formation of copper oxide.  
Affix crankcase heater warning sticker to unit disconnect  
switch.  
CONTROL CIRCUIT WIRING — Control voltage is 24 v.  
See Fig. 8 and unit label diagram for field-supplied wiring  
details. Route control wires through opening in unit end panel  
to connection in unit control box.  
Recover holding charge prior to removal of runaround  
piping loop.  
1. Open service valves:  
a. Discharge service valve on compressor.  
b. Suction service valve on compressor.  
c. Liquid line valve.  
10  
LEGEND  
EQUIP GND — Equipment Ground  
NEC  
National Electrical Code  
Factory Wiring  
Field Wiring  
LEGEND  
Compressor Contactor  
C
HD  
Heating Device  
Fig. 7 — Main Power Supply Wiring  
IFC  
LLSV1  
Indoor-Fan Contactor  
Liquid Line Solenoid Valve 1 — Refrigerant Migration  
Control  
LLSV2  
R
Liquid Line Solenoid Valve 2 — Capacity Control  
Relay  
Factory Wiring  
Field Wiring  
NOTES:  
1. Combination LLSV plus IFC va should not exceed 30 va.  
2. Do not exceed 5 va (24 vac) per coil.  
3. If va values shown in Notes 1 and 2 must be exceeded, use  
accessory relay transformer package 38AE900001 (60 Hz) or  
38AD900003 (50 Hz and 380-3-60).  
Fig. 8 — Remote Thermostat Wiring  
Table 6A — Electrical Data (3 Ph/60 Hz)  
UNIT  
COMPR  
FAN MOTORS (Single Phase)  
FLA (ea)  
Volts  
UNIT  
MOCP  
(Fuse  
Only)  
Total  
38AKS  
Fan No.  
Model  
Supplied*  
MCA  
ICF  
RLA  
LRA  
kW  
Fans  
Nameplate  
Min  
187  
342  
414  
518  
Max  
1
2
501  
201  
601  
101  
208-230  
380  
253  
418  
528  
660  
62.5  
35.0  
29.1  
22.8  
178  
101  
81  
100  
50  
40  
35  
43.6  
24.0  
20.0  
15.7  
170  
93  
4.3  
4.3  
2.3  
1.8  
3.7  
3.7  
1.9  
1.8  
013  
2
1.41  
1.41  
1.41  
1.41  
460  
77  
575  
67  
62  
501  
201  
601  
101  
208-230  
380  
187  
342  
414  
518  
253  
418  
528  
660  
69.3  
38.0  
31.7  
25.6  
199  
112  
84  
100  
60  
50  
40  
49.3  
26.5  
22.1  
17.9  
191  
104  
80  
4.3  
4.3  
2.3  
1.8  
3.7  
3.7  
1.9  
1.8  
014  
2
2
2
460  
575  
73  
69  
501  
201  
601  
101  
208-230  
380  
187  
342  
414  
518  
253  
418  
528  
660  
87.5  
49.3  
40.7  
33.0  
274  
153  
124  
100  
125  
80  
60  
50  
63.6  
36.0  
29.3  
23.8  
266  
145  
120  
96  
4.3  
4.3  
2.3  
1.8  
3.7  
3.7  
1.9  
1.8  
016  
460  
575  
501  
201  
601  
101  
208-230  
380  
187  
342  
414  
518  
254  
418  
508  
632  
93.4  
49.7  
48.1  
40.1  
353  
199  
177  
124  
150  
80  
80  
60  
67.9  
34.6  
34.7  
28.8  
345  
191  
173  
120  
4.3  
4.3  
2.3  
1.8  
3.7  
3.7  
1.9  
1.8  
024  
460  
575  
LEGEND  
Full Load Amps (Fan Motors)  
*Units are suitable for use on electrical systems where voltage sup-  
plied to the unit terminals is not below or above the listed limits.  
FLA  
ICF  
Maximum Instantaneous Current Flow during start-up  
(LRA of compressor plus total FLA of fan motors)  
Total Fan Motor Input (kilowatts)  
NOTES:  
1. The MCA and MOCP values are calculated in accordance  
with the National Electrical Code (NEC) article 440 (U.S.A.  
standard).  
kW  
LRA  
MCA  
Locked Rotor Amps  
Minimum Circuit Amps per NEC (U.S.A.),  
Section 430-24  
2. Motor RLA and LRA values are established in accordance  
with Underwriters’ Laboratories (UL) Standard 1995 (U.S.A.  
standard).  
MOCP  
RLA  
Maximum Overcurrent Protection (amps)  
Rated Load Amps (Compressor)  
11  
Table 6B — Electrical Data (3 Ph/50 Hz)  
UNIT  
COMPR  
FAN MOTORS 230 v (Single Phase)  
Volts  
Supplied*  
UNIT  
38AKS  
FLA (ea)  
Total  
MOCP  
(Fuse  
Only)  
Fan No.  
Model  
MCA  
ICF  
RLA  
LRA  
kW  
Fans  
Nameplate  
Min  
Max  
1
2
803  
903  
230  
400  
198  
342  
264  
457  
47.5  
31.4  
134  
80  
75  
50  
32.9  
20.0  
128  
74  
013  
014  
016  
2
2
2
2.9  
3.5  
1.20  
1.20  
1.20  
803  
903  
230  
400  
198  
342  
264  
457  
51.0  
34.0  
149  
89  
75  
50  
35.7  
22.1  
143  
83  
2.9  
2.9  
3.5  
3.5  
803  
903  
230  
400  
198  
342  
264  
457  
66.9  
43.0  
206  
121  
100  
60  
47.9  
29.3  
200  
115  
803  
303  
903  
230  
346  
400  
198  
311  
342  
254  
380  
440  
91.8  
51.5  
50.2  
213  
121  
179  
150  
80  
80  
67.9  
33.3  
34.6  
207  
115  
173  
024  
2
2.9  
3.5  
1.20  
LEGEND  
Full Load Amps (Fan Motors)  
*Units are suitable for use on electrical systems where voltage sup-  
plied to the unit terminals is not below or above the listed limits.  
FLA  
ICF  
Maximum Instantaneous Current Flow during start-up  
(LRA of compressor plus total FLA of fan motors)  
Total Fan Motor Input (kilowatts)  
NOTES:  
1. The MCA and MOCP values are calculated in accordance  
with the National Electrical Code (NEC) article 440 (U.S.A.  
standard).  
kW  
LRA  
MCA  
Locked Rotor Amps  
Minimum Circuit Amps per NEC (U.S.A.),  
Section 430-24  
2. Motor RLA and LRA values are established in accordance  
with Underwriters’ Laboratories (UL) Standard 1995 (U.S.A.  
standard).  
MOCP  
RLA  
Maximum Overcurrent Protection (amps)  
Rated Load Amps (Compressor)  
7. Electrical power source must agree with nameplate  
rating.  
PRE-START-UP  
IMPORTANT: Before beginning Pre-Start-Up or  
Start-Up, review Start-Up Checklist at the back of this  
book. The Checklist assures proper start-up of a unit  
and provides a record of unit condition, application re-  
quirements, system information, and operation at ini-  
tial start-up.  
8. Crankcase heater must be firmly locked into compressor  
crankcase. Be sure crankcase is warm (heater must be on  
for 24 hours before starting compressor).  
9. Be sure compressor floats freely on the mounting springs  
and that snubber washers can be moved with finger pres-  
sure. See Compressor Mounting, page 8, and Fig. 3 for  
loosening compressor bolts.  
Leak Test and Dehydration — Leak test the entire  
refrigerant system using soap bubbles and/or an electronic  
leak detector. Evacuate and dehydrate entire refrigerant sys-  
tem by use of methods described in GTAC II, Module 4,  
System Dehydration.  
Do not attempt to start the condensing unit, even  
momentarily, until the following steps have been com-  
pleted. Compressor damage may result.  
System Check  
Turn On Crankcase Heater Turn on crankcase heater  
for 24 hours before starting the unit to be sure all the  
refrigerant is out of the oil. To energize the crankcase heater,  
proceed as follows:  
1. Set the space thermostat set point above the space tem-  
perature so there is no demand for cooling.  
1. Check all air handler(s) and other equipment auxiliary com-  
ponents. Consult the manufacturer’s instructions regard-  
ing any other equipment connected to the condensing unit.  
If unit has field-installed accessories, be sure all are prop-  
erly installed and correctly wired. If used, airflow switch  
must be properly installed.  
2. Backseat (open) compressor suction and discharge valves.  
Now close valves one turn to allow refrigerant pressure  
to reach test gages.  
2. Close the field disconnect.  
3. Turn the fan circuit breaker on. Leave the com-  
pressor circuit breakers off. The crankcase heater is now  
energized.  
3. Open liquid line service valve.  
Preliminary Charge — Refer to GTAC II, Module 5,  
Charging, Recovery, Recycling, and Reclamation for charg-  
ing methods and procedures. Charge each system with R-22  
by the liquid charging method (through liquid service valve)  
on the high side. Charge according to the values in the  
Charging Chart, Fig. 10, 11, or 12.  
4. Check tightness of all electrical connections.  
5. Compressor oil level should be visible in sight glass. See  
Fig. 9. Adjust the oil level as required. Refer to Pre-  
liminary Oil Charge section. No oil should be removed  
unless the crankcase heater has been energized for at least  
24 hours.  
6. Be sure unit is properly leak checked, dehydrated, and  
charged. See Preliminary Charge, this page.  
12  
START-UP  
Compressor crankcase heater must be on for 24 hours  
before start-up. After the heater has been on for 24 hours,  
the unit can be started. If no time has elapsed since the pre-  
liminary charge step has been completed, it is unnecessary  
to wait the 24-hour period.  
Never charge liquid into the low-pressure side of sys-  
tem. Do not overcharge. During charging or removal of  
refrigerant, be sure indoor-fan system is operating.  
Adjust Refrigerant Charge  
Preliminary Checks  
NOTE: Actual start-up and all refrigerant charge modifica-  
tions should be done only under supervision of a qualified  
refrigeration mechanic.  
With all fans operating, adjust the refrigerant charge in  
accordance with the unit charging charts located on the  
inside of the control box doors and in Fig. 10-12.  
Measure pressure at the liquid line service valve, being  
sure Schrader depressor is used if required. Also, measure  
liquid line temperature as close to the liquid service valve as  
possible. Add charge until the pressure and temperature con-  
ditions of the charging chart curve are met. If liquid pressure  
and temperature point fall above curve, add charge. If liquid  
pressure and temperature point fall below curve, reduce the  
charge until the conditions match the curve.  
If the sight glass is cloudy, check refrigerant charge again.  
Ensure all fans are operating. Also ensure maximum  
allowable liquid lift has not been exceeded. If charged per  
chart and if the sight glass is still cloudy, check for a plugged  
filter drier or a partially closed solenoid valve. Replace or  
repair, as needed.  
1. Ensure that compressor service valves are backseated.  
2. Verify that each compressor floats freely on its mounting  
springs.  
3. Check that electric power supply agrees with unit name-  
plate data.  
4. Verify that compressor crankcase heater is securely in place.  
5. Check that compressor crankcase heater has been on at  
least 24 hours.  
6. Note that compressor oil level is visible in the sight glass.  
7. Recheck for leaks using same procedure as pre-  
viously outlined in Pre-Start-Up section, Leak Test and  
Dehydration.  
8. If any leaks are detected, evacuate and dehydrate as pre-  
viously outlined in Pre-Start-Up section, Leak Test and  
Dehydration.  
9. All internal wiring connections must be tight, and all bar-  
riers and covers must be in place.  
Preliminary Oil Charge — Compressor is factory  
charged with oil (see Tables 1A-1D). When oil is checked at  
start-up, it may be necessary to add or remove oil to bring  
it to the proper level. One recommended oil level adjust-  
ment method follows:  
Check Compressor Oil Level — After adjusting the  
refrigerant charge, allow the compressor to run fully loaded  
for 20 minutes. Running oil level should be within view of  
the crankcase sight glass. Stop the compressor at the field  
power supply disconnect and check the crankcase oil level.  
Add oil only if necessary to bring the oil into view in the  
sight glass. If oil is added, run the compressor for an addi-  
tional 10 minutes, then stop and check oil level. If the level  
remains low, check the piping system for proper design for  
oil return; also, check the system for leaks.  
If the initial check shows too much oil (too high in the  
sight glass) remove oil to proper level. See Preliminary Oil  
Charge, this page, for proper procedure for adding and  
removing oil. See Fig. 9.  
When the above checks are complete, repeat the proce-  
dure with the unit operating at minimum load conditions.  
Unload the compressor by turning the control set point  
adjustment nut counterclockwise until the adjustment nut stops.  
The unloader is now at 0 psig (0 kPag) set point. If electric  
actuated unloaders are installed, energize the solenoid to un-  
load the compressor.  
ADD OIL — Close suction service valve and pump down  
crankcase to 2 psig (14 kPag). (Low-pressure switch must  
be jumpered.) Wait a few minutes and repeat until pressure  
remains steady at 2 psig (14 kPag). Remove oil fill plug above  
the oil level sight glass, add oil through plug hole, and  
replace plug. Run compressor for 20 minutes and check oil  
level. See Fig. 9.  
NOTE: Use only Carrier approved compressor oil. Ap-  
proved sources are:  
Petroleum Specialties Inc. . . . . . . . . . . . . . . . . Cryol 150A  
Texaco, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . Capella WF-32  
Witco Chemical Co. . . . . . . . . . . . . . . . . . . . . . Suniso 3GS  
Do not use oil that has been drained out, or oil that has  
been exposed to atmosphere.  
REMOVE OIL — Pump down compressor to 2 psig  
(14 kPag). Loosen the 14-in. (6.4 mm) pipe plug at the com-  
pressor base and allow the oil to seep out past the threads  
of the plug.  
Return unloader to original setting after checks are  
complete.  
NOTE: The crankcase will be slightly pressurized. Do not  
remove the plug, or the entire oil charge will be lost.  
Small amounts of oil can be removed through the oil pump  
discharge connection while the compressor is running.  
Start Unit — The field disconnect is closed, the fan cir-  
cuit breaker is closed, and the space thermostat is set above  
ambient so that there is no demand for cooling. Only the  
crankcase heater will be energized.  
Next, close the compressor circuit breaker and then reset  
space thermostat below ambient so that a call for cooling is  
ensured. If compressor does not start, set thermostat lower.  
38AKS024  
38AKS013,014,016  
(06E COMPRESSOR)  
(06D COMPRESSOR)  
Fig. 9 — Operating Oil Levels  
NOTE: Do not use circuit breaker to start and stop the com-  
pressor except in an emergency.  
After starting, there is a delay of at least 3 seconds before  
compressor starts.  
Final Checks — Ensure all safety controls are operat-  
ing, control panel covers are on, and the service panels are  
in place.  
13  
Fig. 10 — 38AKS013 and 38AKS024 Charging Chart  
Fig. 11 — 38AKS014 Charging Chart  
Fig. 12 — 38AKS016 Charging Chart  
PRESSURE DIFFERENTIAL (difference between cylinder  
load and unload points) is adjustable from 6 to 22 psig  
(41.4 to 152 kPag). To adjust, turn pressure differential ad-  
justment screw (Fig. 13) counterclockwise to its back stop  
position. In this position, differential is 6 psig (41.4 kPag).  
Next, turn adjustment clockwise to desired pressure differ-  
ential setting. Every full turn clockwise increases differen-  
tial by 1.5 psig (10.3 kPag).  
OPERATING SEQUENCE  
Cooling — When the first stage (TC1) of the cooling ther-  
mostat closes, the timer starts. After approximately  
3 seconds, the timer expires, energizing the compressor and  
fan motor no. 1. When the liquid pressure builds to approxi-  
mately 257 psig (1772 kPa), fan motor no. 2 is energized.  
On demand for additional cooling capacity, the second stage  
(TC2) of the cooling thermostat closes, energizing a field-  
supplied liquid line solenoid (LLS) valve, which opens. This  
increases the suction pressure, causing the compressor to  
operate at higher capacity.  
Head Pressure Control — Fan cycling is a standard  
feature. The no. 2 fan cycles in response to changes in liquid  
pressure. The switch cycles the fan off at 160 ± 10 psig  
(1103 ± 69 kPa) as pressure decreases, and cycles it back on  
at 255 ± 10 psig (1758 ± 69 kPa).  
When fan switch is set at AUTO, the indoor unit fan cycles  
with the compressor. When the switch is set at ON, the  
indoor unit fan runs continuously.  
At shutdown, the Time GuardII timer prevents the com-  
pressor from restarting for approximately 5 minutes.  
When installed, a field-supplied solenoid valve (wired in  
parallel with the compressor contactor coil), shuts off the liq-  
uid line to prevent refrigerant migration back to the com-  
pressor during the off cycle.  
Heating — The heating thermostat (TH) energizes a field-  
supplied relay which operates heating controls and ener-  
gizes the indoor unit relay. When the fan switch is set at AUTO,  
the indoor unit fan cycles with the heating control. The  
indoor unit fan runs continuously when the fan switch is set  
at ON.  
Causes of complete unit shutdown are: interruption of sup-  
plied power, open compressor internal protector (IP), open  
control circuit breaker, or an open high- or low-pressure safety  
switch.  
Fan Cycling — Head pressure control is accomplished  
by cycling the fans. The no. 2 fan responds to liquid line  
pressure, cycling on at approximately 255 psig (1758 kPa)  
and off at approximately 160 psig (1103 kPa).  
Winter Start Control (If Installed) — When the com-  
pressor starts, the control’s bypass timer contacts close for  
150 seconds, thereby bypassing the low-pressure switch dur-  
ing start-up. After 150 seconds, the bypass timer contacts  
open and the low-pressure switch is restored to the safety  
circuit.  
Fig. 13 — Compressor Capacity Control Unloader  
Time Guard II Circuit — Circuit prevents short-  
cycling by providing a delay of approximately 5 minutes  
before restarting compressor after shutdown from safety  
device action.  
On start-up, the Time Guard II timer causes a delay of  
approximately 3 seconds after thermostat closes.  
On compressor shutdown, the timer recycles for approxi-  
mately 5 minutes. During this time, the compressor cannot  
restart.  
SERVICE  
Capacity Control — A suction pressure-actuated  
unloader controls 2 cylinders and provides capacity control.  
Unloaders are factory set (see Tables 1A-1D), but can be  
field adjusted as described in the 2 following sections.  
Refer to Fig. 14 and to label diagram on unit.  
CONTROL SET POINT (cylinder load point) is adjustable  
from 0 to 85 psig (586 kPa). To adjust, turn control set point  
adjustment nut (Fig. 13) clockwise to its bottom stop. In this  
position, set point is 85 psig (586 kPa). Next, turn adjust-  
ment counterclockwise to desired control set point. Every  
full turn counterclockwise decreases set point by 7.5 psig  
(51.7 kPa).  
Fig. 14 — Timer Sequence Chart  
17  
Winter Start Control (If Required) — Install Ac-  
Outdoor Fans — Each fan is supported by a formed-  
wire mount bolted to the fan deck and covered with a wire  
guard. The exposed end of the motor shaft is covered with  
a rubber boot. In case a fan motor must be repaired or re-  
placed, be sure the rubber boot is put back on when the fan  
is reinstalled and be sure the fan guard is in place before  
starting the unit. Figure 15 shows the proper position of the  
mounted fan. Fan motors have permanently lubricated  
bearings.  
cessory Package 38AE900021.  
Crankcase Heater — The heater prevents refrigerant  
migration and compressor oil dilution during shutdown when-  
ever compressor is not operating. It is wired to cycle with  
the compressor; the heater is off when compressor is run-  
ning, and on when compressor is off.  
Both compressor service valves must be closed whenever  
the crankcase heater is deenergized for more than 6 hours.  
The crankcase heater is operable as long as the control cir-  
cuit is energized.  
Lubrication  
FAN MOTORS have sealed bearings. No provisions are made  
for lubrication.  
Compressor Protection  
COMPRESSOR has its own oil supply. Loss of oil due to a  
leak in the system should be the only reason for adding oil  
after the system has been in operation. See Preliminary Oil  
Charge section.  
CIRCUIT BREAKER — Calibrated trip manual reset, am-  
bient compensated, magnetic breaker protects against motor  
overload and locked rotor conditions.  
COMPRESSOR OVERTEMPERATURE PROTECTION (IP)  
— A thermostat installed on compressor motor winding  
reacts to excessively high winding temperatures and shuts  
off the compressor.  
Cleaning Coils — The coils can be cleaned with a vacuum  
cleaner, washed out with low velocity water, blown out with  
low-pressure compressed air, or brushed (do not use wire  
brush). Fan motors are drip-proof but not waterproof. Do  
NOT use acid cleaners.  
Clean outdoor coil annually or as required by location or  
outdoor air conditions. Inspect coil monthly, and clean as  
required. Fins are not continuous through coil sections; dirt  
and debris may pass through first section, become trapped  
between the 2 rows of fins (38AKS013) or 3 rows of fins  
(38AKS014-024) and restrict outdoor airflow. Use a flash-  
light to determine if dirt or debris has collected between coil  
sections. Clean coil as follows:  
TIME GUARDII CONTROL — Control prevents com-  
pressor from short cycling. See Operating Sequence.  
CRANKCASE HEATER — Heater minimizes absorption of  
liquid refrigerant by oil in crankcase during brief or ex-  
tended shutdown periods. The control circuit is maintained  
if compressor fan motor circuit breakers are turned off. The  
main disconnect must be on to energize crankcase heater.  
IMPORTANT: Never open any switch or disconnect  
that energizes the crankcase heater unless unit is being  
serviced or is to be shut down for a prolonged period.  
After a prolonged shutdown on a service job, energize  
the crankcase heater for 24 hours before starting the  
compressor.  
1. Turn off unit power.  
2. Remove screws holding rear corner posts and top  
cover in place. Pivot top cover up 12 to 18 in. (305 to  
457 mm) and support with a rigid support. See Fig. 16.  
3. Remove clips securing tube sheets together at the return  
bend end of the coil. Carefully spread the ends of the coil  
rows apart by moving the outer sections. See Fig. 17.  
4. Using a water hose, or other suitable equipment, flush down  
between the sections of coil to remove dirt and debris.  
High-Pressure Switches — Switches have fixed,  
nonadjustable settings. Switches are mounted on the  
compressors.  
Low-Pressure Switches — Switches have fixed,  
nonadjustable settings. Switches are mounted on the  
compressors.  
5. Clean the remaining surfaces in the normal manner.  
6. Reposition outer coil sections.  
7. Reinstall clips which secure tube sheets.  
8. Replace top cover and rear corner posts.  
TO CHECK — Slowly close liquid shutoff valve and allow  
compressor to pump down. Do not allow compressor  
pump-down below 2 psig (13.8 kPa). Compressor should shut  
down when suction pressure drops to cutout pressure in  
Tables 1A-1D, and should restart when pressure builds up to  
cut-in pressure shown.  
18  
Fig. 15 — Outdoor Fan  
Fig. 17 — Coil Cleaning (Typical)  
Fig. 16 — Pivot and Support Top Cover  
19  
TROUBLESHOOTING  
PROBLEM  
COMPRESSOR DOES NOT RUN  
Contactor Open  
SOLUTION  
1. Power off.  
1. Restore power.  
2. Fuses blown in field power circuit.  
3. No control power.  
2. After finding cause and correcting, replace with correct size fuse.  
3. Check control circuit breaker; reset if tripped or replace if defective.  
4. Check thermostat setting.  
4. Thermostat circuit open.  
5. Time GuardII device not operating.  
6. Compressor circuit breaker tripped.  
5. Check Time Guard II devices.  
6. Check for excessive compressor current draw. Reset breaker;  
replace if defective.  
7. Safety device lock-out circuit active.  
8. Low-pressure switch open.  
7. Reset lock-out circuit at thermostat or circuit breaker.  
8. Check for refrigerant undercharge, obstruction of indoor airflow, or  
whether compressor suction shutoff valve is fully open. Make sure liquid  
line solenoid valve(s) is open.  
9. High-pressure switch open.  
9. Check for refrigerant overcharge, obstruction of outdoor airflow, air in  
system, or whether compressor discharge valve is fully open. Be sure  
outdoor fans are operating correctly.  
10. Compressor overtemperature switch open.  
11. Loose electrical connections.  
12. Compressor stuck.  
10. Check for open condition. Allow for reset. Replace if defective.  
11. Tighten all connections.  
12. See compressor service literature.  
Contactor Closed  
1. Compressor leads loose.  
2. Motor windings open.  
1. Check connections.  
2. See compressor service literature.  
3. Single phasing.  
3. Check for blown fuse. Check for loose connection at compressor terminal.  
COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH  
Outdoor Fan On  
1. Replace switch.  
1. High-pressure switch faulty.  
2. Reversed fan rotation.  
3. Airflow restricted.  
2. Confirm rotation, correct if necessary.  
3. Remove obstruction.  
4. Air recirculating.  
4. Clear airflow area.  
5. Noncondensables in system.  
6. Refrigerant overcharge.  
7. Line voltage incorrect.  
8. Refrigerant system restrictions.  
5. Recover refrigerant and recharge as required.  
6. Recover refrigerant as required.  
7. Consult power company.  
8. Check or replace filter drier, expansion valve, etc. Check that compressor  
discharge service valve is fully open.  
Outdoor Fan Off  
1. Fan slips on shaft.  
1. Tighten fan hub setscrews.  
2. Check power and capacitor.  
3. Replace bearings.  
2. Motor not running.  
3. Motor bearings stuck.  
4. Motor overload open.  
4. Check overload rating. Check for fan blade obstruction.  
5. Replace motor.  
5. Motor burned out.  
COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH  
Indoor-Air Fan Running  
1. Compressor suction service valve partially closed.  
1. Open valve fully.  
2. Liquid line solenoid valve(s) fails to open.  
2. Check liquid line solenoid valve(s) for proper operation. Replace if  
necessary.  
3. Filter drier plugged.  
3. Replace filter drier.  
4. Expansion valve power head defective.  
5. Low refrigerant charge.  
4. Replace power head.  
5. Add charge. Check low-pressure switch setting.  
20  
TROUBLESHOOTING (cont)  
PROBLEM  
SOLUTION  
COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH (cont)  
Airflow Restricted  
1. Coil iced up.  
2. Coil dirty.  
1. Check refrigerant charge.  
2. Clean coil fins.  
3. Air filters dirty.  
4. Dampers closed.  
3. Clean or replace filters.  
4. Check damper operation and position.  
Indoor-Air Fan Stopped  
1. Electrical connections loose.  
1. Tighten all connections.  
2. Replace relay.  
2. Fan relay defective.  
3. Motor overload open.  
3. Power supply.  
4. Motor defective.  
4. Replace motor.  
5. Fan belt broken or slipping.  
COMPRESSOR RUNNING BUT COOLING INSUFFICIENT  
Suction Pressure Low  
5. Replace or tighten belt.  
1. Add refrigerant.  
1. Refrigerant charge low.  
2. Head pressure low.  
2. Check refrigerant charge.  
Check outdoor-air fan thermostat settings.  
3. Air filters dirty.  
3. Clean or replace filters.  
4. Replace power head.  
5. Check low-pressure setting.  
6. Remove obstruction.  
4. Expansion valve power head defective.  
5. Indoor coil partially iced.  
6. Indoor airflow restricted.  
Suction Pressure High  
1. Unloaders not functioning.  
1. Check unloader adjustments.  
Check unloader setting.  
2. Compressor valve defective.  
3. Heat load excessive.  
2. See compressor service literature.  
3. Check for open doors or windows in vicinity of fan coil.  
UNIT OPERATES TOO LONG OR CONTINUOUSLY  
1. Low refrigerant charge.  
2. Control contacts fused.  
1. Add refrigerant.  
2. Replace control.  
3. Air in system.  
3. Purge and evacuate system.  
4. Clean or replace.  
4. Partially plugged expansion valve or filter drier.  
SYSTEM IS NOISY  
1. Piping vibration.  
1. Support piping as required.  
2. Compressor noisy.  
2. Check valve plates for valve noise. Replace compressor if  
bearings are worn.  
COMPRESSOR LOSES OIL  
1. Leak in system.  
1. Repair leak.  
2. Crankcase heaters not energized during shutdown.  
2. Check wiring and relays. Check heater and replace if  
defective.  
3. Improper interconnecting piping design.  
FROSTED SUCTION LINE  
3. Check piping for oil return. Replace if necessary.  
Expansion valve admitting excess refrigerant.  
HOT LIQUID LINE  
Adjust expansion valve.  
1. Shortage of refrigerant due to leak.  
2. Expansion valve opens too wide.  
FROSTED LIQUID LINE  
1. Repair leak and recharge.  
2. Adjust expansion valve.  
1. Restricted filter drier.  
1. Remove restriction or replace.  
2. Replace valve.  
2. Liquid line solenoid valve partially closed.  
COMPRESSOR WILL NOT UNLOAD  
1. Defective unloader.  
1. Replace unloader.  
2. Replace valve.  
3. Rewire correctly.  
4. Replace spring.  
2. Defective capacity control solenoid valve (if used).  
3. Miswired capacity control liquid line solenoid (if used).  
4. Weak, broken, or wrong valve body spring.  
COMPRESSOR WILL NOT LOAD  
1. Miswired capacity control liquid line solenoid (if used).  
2. Defective capacity control solenoid valve (if used).  
3. Plugged strainer (high side).  
1. Rewire correctly.  
2. Replace valve.  
3. Clean or replace strainer.  
4. Clean or replace the necessary parts.  
4. Stuck or damaged unloader piston or piston ring(s).  
21  
Copyright 1998 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. 563-701  
Printed in U.S.A.  
Form 38AKS-3SI  
Pg 22  
9-98  
Replaces: 38AKS-2SI  
Tab 3a 2a  
START-UP CHECKLIST  
A. Preliminary Information  
OUTDOOR: MODEL NO.  
INDOOR: AIR HANDLER MANUFACTURER  
MODEL NO.  
SERIAL NO.  
SERIAL NO.  
ADDITIONAL ACCESSORIES  
B. Pre-Start-Up  
OUTDOOR UNIT  
IS THERE ANY SHIPPING DAMAGE?  
IF SO, WHERE:  
(Y/N)  
(Y/N)  
WILL THIS DAMAGE PREVENT UNIT START-UP?  
(Y/N)  
CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT?  
HAS THE GROUND WIRE BEEN CONNECTED? (Y/N)  
HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY?  
ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY?  
(Y/N)  
(Y/N)  
HAVE COMPRESSOR HOLDDOWN BOLTS BEEN LOOSENED (Snubber washers are snug, but not tight)?  
(Y/N)  
CONTROLS  
ARE THERMOSTAT AND INDOOR FAN CONTROL WIRING  
CONNECTIONS MADE AND CHECKED?  
(Y/N)  
ARE ALL WIRING TERMINALS (including main power supply) TIGHT?  
HAS CRANKCASE HEATER BEEN ENERGIZED FOR 24 HOURS?  
(Y/N)  
(Y/N)  
INDOOR UNIT  
HAS WATER BEEN PLACED IN DRAIN PAN TO CONFIRM PROPER DRAINAGE?  
ARE PROPER AIR FILTERS IN PLACE? (Y/N)  
HAVE FAN AND MOTOR PULLEYS BEEN CHECKED FOR PROPER ALIGNMENT?  
(Y/N)  
(Y/N)  
DO THE FAN BELTS HAVE PROPER TENSION?  
(Y/N)  
HAS CORRECT FAN ROTATION BEEN CONFIRMED?  
(Y/N)  
PIPING  
ARE LIQUID LINE SOLENOID VALVES LOCATED AT THE INDOOR COILS AS REQUIRED?  
HAVE LEAK CHECKS BEEN MADE AT COMPRESSOR, OUTDOOR AND INDOOR COILS,  
(Y/N)  
TXVs (Thermostatic Expansion Valves), SOLENOID VALVES, FILTER DRIERS, AND FUSIBLE PLUGS  
WITH A LEAK DETECTOR? (Y/N)  
LOCATE, REPAIR, AND REPORT ANY LEAKS.  
HAVE ALL COMPRESSOR SERVICE VALVES BEEN FULLY OPENED (BACKSEATED)?  
(Y/N)  
HAVE LIQUID LINE SERVICE VALVES BEEN OPENED?  
(Y/N)  
IS THE OIL LEVEL IN EACH COMPRESSOR CRANKCASE VISIBLE IN THE COMPRESSOR SIGHT GLASSES?  
(Y/N)  
CHECK VOLTAGE IMBALANCE  
LINE-TO-LINE VOLTS:  
(AB + AC + BC)/3 = AVERAGE VOLTAGE =  
MAXIMUM DEVIATION FROM AVERAGE VOLTAGE =  
AB  
V
AC  
V
BC  
V
V
V
VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) =  
%
IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM!  
CALL LOCAL POWER COMPANY FOR ASSISTANCE.  
CL-1  
C. Start-Up  
CHECK INDOOR UNIT FAN SPEED AND RECORD.  
CHECK OUTDOOR UNIT FAN SPEED AND RECORD.  
AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:  
OIL PRESSURE  
SUCTION PRESSURE  
SUCTION LINE TEMP  
DISCHARGE PRESSURE  
DISCHARGE LINE TEMP  
ENTERING OUTDOOR UNIT AIR TEMP  
LEAVING OUTDOOR UNIT AIR TEMP  
INDOOR UNIT ENTERING-AIR DB (dry bulb) TEMP  
INDOOR UNIT ENTERING-AIR WB (wet bulb) TEMP  
INDOOR UNIT LEAVING-AIR DB TEMP  
INDOOR UNIT LEAVING-AIR WB TEMP  
COMPRESSOR AMPS (L1/L2/L3)  
/
/
CHECK THE COMPRESSOR OIL LEVEL SIGHT GLASSES; ARE THE SIGHT GLASSES SHOWING  
OIL LEVEL IN VIEW? (Y/N)  
NOTES:  
Copyright 1998 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 563-701 Printed in U.S.A. Form 38AKS-3SI CL-2 9-98 Replaces: 38AKS-2SI  
Tab 3a 2a  
4

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