50TJ016-028
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . .1
IMPORTANT: Units have high ambient operating lim-
its. If limits are exceeded, the unit will automatically
lock the compressor out of operation. Manual reset will
be required to restart the compressor.
•
•
ROOF CURB
ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . . . . . . .1
INSTALLATION
Step 1 — Provide Unit Support
•
•
POSITIONING
ROOF MOUNT
ROOF CURB — Assemble and install accessory roof curb or
horizontal adapter roof curb in accordance with instructions
shipped with the curb or horizontal adapter. Accessory roof
curb and horizontal adapter roof curb and information required
to field fabricate a roof curb or horizontal adapter roof curb are
shown in Fig. 1 and 2. Install insulation, cant strips, roofing,
and counter flashing as shown. Ductwork can be secured to
roof curb before unit is set in place.
Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . . . . .7
Step 4 — Make Unit Duct Connections . . . . . . . . . . . . . . .7
Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . . . . . .7
Step 6 — Make Electrical Connections . . . . . . . . . . . . . .8
•
•
•
•
FIELD POWER SUPPLY
FIELD CONTROL WIRING
OPTIONAL NON-FUSED DISCONNECT
OPTIONAL CONVENIENCE OUTLET
Step 7 — Make Outdoor-Air Inlet
IMPORTANT: The gasketing of the unit to the roof curb
or adapter roof curb is critical for a leak-proof seal.
Install gasket supplied with the roof curb or adapter roof
curb as shown in Fig. 1. Improperly applied gasket can
result in air leaks and poor unit performance.
Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
•
•
MANUAL OUTDOOR-AIR DAMPER
OPTIONAL ECONOMI$ER
Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . .12
Step 9 — Install All Accessories. . . . . . . . . . . . . . . . . . . .15
•
•
MOTORMASTER® I CONTROL INSTALLATION
MOTORMASTER III CONTROL INSTALLATION
Curb or adapter roof curb should be level. This is necessary
to permit unit drain to function properly. Unit leveling toler-
Step 10 — Install Humidistat for Optional
MoistureMiser Dehumidification Package . . . . . . . . .16
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-24
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-31
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32,33
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
1
ance is /16 in. per linear ft in any direction. Refer to Accesso-
ry Roof Curb or Horizontal Adapter Roof Curb Installation In-
structions for additional information as required.
ALTERNATE UNIT SUPPORT — When the curb or adapter
cannot be used, support unit with sleepers using unit curb or
adapter support area. If sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 4-in. x 4-in.
pads on each side.
SAFETY CONSIDERATIONS
Installation and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install, re-
pair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit, and
other safety precautions that may apply.
Step 2 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transportation
agency. Keep unit upright, and do not drop. Use spreader bars
over unit to prevent sling or cable damage. Rollers may be used
to move unit across a roof. Level by using unit frame as a refer-
1
ence; leveling tolerance is
/
16
in. per linear ft in any direc-
tion. See Fig. 3 for additional information. Unit weight is
shown in Table 1.
Four lifting holes are provided in ends of unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Provide clearance around and above unit
for airflow, safety, and service access (Fig. 4 and 5).
Do not install unit in an indoor location. Do not locate air in-
lets near exhaust vents or other sources of contaminated air.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
ROOF MOUNT — Check building codes for weight distribu-
tion requirements.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 535-034 Printed in U.S.A. Form 50TJ-17SI Pg 1 2-01 Replaces: 50TJ-14SI
Book 1
Tab 1b
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DIMENSIONS
MAXIMUM
UNIT
50TJ
SHIPPING WEIGHT
A
B
Lb
Kg
703
748
771
839
Ft-in.
mm Ft-in. mm
016
020
024
028
1550
1650
1700
1850
6-111/2 2121 4- 0 1219
6-111/2 2121 3-10 1168
6-111/2 2121 3- 7 1092
6-111/2 2121 3- 5 1041
NOTE: For preassembled horizontal adapter roof curb part no.
CRRFCURB013A00, the accessory kit includes a factory-designed,
high-static, transition duct. For horizontal curb part no.
CRRFCURB012A00, a field-supplied transition duct is required.
NOTES:
Fig. 2 — Horizontal Adapter Roof Curb
and Roof Curb
1. Dimensions in ( ) are in millimeters.
2. Refer to Fig. 4 and 5 for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner
post from packaging to protect coil from damage. Use bumper
boards for spreader bars.
5. Weights do not include optional EconoMi$er. See Fig. 4 and 5 for
EconoMi$er weight. See Table 1 for MoistureMiser weight.
6. Weights given are for aluminum evaporator and condenser coil
plate fins.
All panels must be in place when rigging.
Fig. 3 — Rigging Details
3
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4
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5
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Table 1 — Physical Data
016
208/230, 460 v
UNIT 50TJ
NOMINAL CAPACITY (tons)
OPERATING WEIGHT
EconoMi$er
020
024
028
575 v
15
1550
80
18
1650
80
20
1700
80
25
1850
80
MoistureMiser Dehumidification
Package
40
40
40
40
COMPRESSOR/MANUFACTURER
Scroll, Copeland
1...ZR108KC,
1...ZR94KC
55, 45
1...ZR125KC,
1...ZR108KC
55, 45
1...ZR16M3,
1...ZR125KC
60, 40
Quantity...Model (Ckt 1, Ckt 2)
2...ZR94KC
50, 50
2
Capacity Stages (%)
Number of Refrigerant Circuits
Oil (oz) (Ckt 1, Ckt 2)
2
2
2
81, 81
106, 81
106,106
136, 106
REFRIGERANT TYPE
Expansion Device
Operating Charge (lb-oz)
Circuit 1*
R-22
TXV
10-10
10-10
15-5
12-3
16-0
13-6
20-13
13- 0
Circuit 2
CONDENSER COIL
Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced,
Aluminum Pre-Coated, or Copper Plate Fins
Rows...Fins/in.
Total Face Area (sq ft)
2...17
21.7
3...15
21.7
3...15
21.7
4...15
21.7
CONDENSER FAN
Nominal Cfm
Propeller Type
10,500
3...22
10,500
3...22
14,200
2...30
14,200
2...30
Quantity...Diameter (in.)
Motor Hp...Rpm
1/2...1050
1100
1/2...1050
1100
1...1075
3400
1...1075
3400
Watts Input (Total)
EVAPORATOR COIL
Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or
Copper Plate Fins, Face Split
Rows...Fins/in.
Total Face Area (sq ft)
2...17
17.5
3...15
17.5
3...15
17.5
4...15
17.5
EVAPORATOR FAN
Quantity...Size (in.)
Type Drive
Centrifugal Type
2...10 x 10
2...10 x 10
Belt
2...12 x 12
Belt
2...12 x 12
Belt
2...12 x 12
Belt
6000
3.7
Belt
Nominal Cfm
6000
7200
5
8000
10,000
Motor Hp
Motor Nominal Rpm
3.0
1725
7.5
1745
10
1725
1745
1740
8.7 [208/230, 575 v]
9.5 [460 v]
213T
10.2 [208/230, 575 v]
Maximum Continuous Bhp
4.25
3.45
5.90
11.8 [380, 460 v]
215T
Motor Frame Size
Nominal Rpm High/Low
Fan r/s Range
56H
—
56H
—
184T
—
—
—
Low-Medium Static
High Static
891-1179
1227-1550
Ball
1159-1429
—
910-1095
1069-1287
Ball
1002-1225
1193-1458
Ball
1066-1283
1332-1550
Ball
Motor Bearing Type
Ball
Maximum Allowable Rpm
Motor Pulley Pitch Diameter
Min/Max (in.)
1550
1550
4.3/5.3
1550
1550
1550
Low-Medium Static
High Static
3.1/4.1
4.9/5.9
4.9/5.9
11/8
9.4
8.0
5.4/6.6
5.4/6.6
13/8
4.9/5.9
4.9/5.9
13/8
3.7/4.7
—
7
7
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
/
/
8
8
Low-Medium Static
High Static
6.0
5.2
6.4
—
9.4
8.0
7.9
6.4
Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type...Length (in.)
13/16
13/16
17/16
17/16
17/16
Low-Medium Static
High Static
1...BX...42
1...BX...42
13.5-15.5
48
1...BX...45
—
1...BX...50
1...BX...48
13.3-14.8
37
1...BX...53
1...BX...50
14.6-15.4
37
2...BX...50
2...BX...47
14.6-15.4
36
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full Turns
From Closed Position
Factory Speed
Factory Speed Setting (rpm
13.5-15.5
44
Low-Medium Static
High Static
55
—
34
44
45
6
3.5
1035
1389
13/16
6
3.5
6
3.5
1002
1178
17/16
6
3.5
1120
1328
17/16
6
3.5
1182
1470
17/16
Low-Medium Static
High Static
1296
—
Fan Shaft Diameter at Pulley (in.)
13/16
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
426
320
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
27
44
FREEZE PROTECTION THERMOSTAT (F)
Opens
Closes
30
45
5
5
OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)
Cleanable
2...20 x 25 x 1
1...20 x 20 x 1
RETURN-AIR FILTERS
Quantity...Size (in.)
Throwaway†
4...20 x 20 x 2
4...16 x 20 x 2
POWER EXHAUST
1/2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)
LEGEND
†The 50TJ028 units requires 2-in. industrial-grade filters capable of handling
face velocities of up to 625 ft/min (such as American Air Filter no. 5700 or
equivalent).
Bhp
TXV
—
—
Brake Horsepower
Thermostatic Expansion Valve
NOTE: The 50TJ016-028 units have a low-pressure switch (standard) located
on the suction side.
*Circuit 1 uses the lower portion of condenser coil and lower portion of evap-
orator coils; and Circuit 2 uses the upper portion of both coils.
6
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Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors be-
tween unit and ducts as required. Insulate and weatherproof all
external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be in-
sulated and covered with a vapor barrier.
Step 4 — Make Unit Duct Connections — Unit
is shipped for through-the-bottom duct connections. Ductwork
openings are shown in Fig. 6. Field-fabricated concentric duct-
work may be connected as shown in Fig. 7 and 8. Attach all
ductwork to roof curb and roof curb basepans. Refer to installa-
tion instructions shipped with accessory roof curb for more
information.
The 50TJ units with electric heat require a 1-in. clearance
for the first 24 in. of ductwork.
Step 5 — Trap Condensate Drain — See Fig. 4, 5,
and 9 for drain location. Plug is provided in drain hole and
3
must be removed when unit is operating. One /4-in. half-
Outlet grilles must not lie directly below unit discharge.
coupling is provided inside unit evaporator section for conden-
NOTE: A 90-degree elbow must be provided in the ductwork
to comply with UL (Underwriters’ Laboratories) codes for use
with electric heat.
sate drain connection. An 81/2 in. x 3/4-in. diameter nipple and a
3
2-in. x /4-in. diameter pipe nipple are coupled to standard
3/4-in. diameter elbows to provide a straight path down through
holes in unit base rails (see Fig. 10). A trap at least 4-in. deep
must be used.
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.
Due to electric heater, supply duct will require 90 degree
elbow.
Shaded area indicates block-off panels.
NOTE: Dimensions A, A′, and B, B′ are obtained from field-supplied
ceiling diffuser.
Fig. 8 — Concentric Duct Details
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 6 — Air Distribution — Thru-the-Bottom
(50TJ020-028 Shown)
3/4" FPT DRAIN
CONNECTION
1-3/8"
DRAIN HOLES
Fig. 9 — Condensate Drain Details
(50TJ016,020 Shown)
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
(50TJ020-028 Shown)
7
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IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility com-
pany immediately.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to the installation in-
structions included with the accessory. Locate thermostat as-
sembly on a solid wall in the conditioned space to sense aver-
age temperature.
Route thermostat cable or equivalent single leads of no. 18
AWG (American Wire Gage) colored wire from subbase termi-
nals through conduit in unit to low-voltage connections as
shown on unit label wiring diagram and in Fig. 12.
NOTE: For wire runs up to 50 ft, use no. 18 AWG insulated
wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insu-
lated 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 to the thermostat and will
require a junction box and splice at the thermostat.
Fig. 10 — Make Electrical Connections
Step 6 — Make Electrical Connections
FIELD POWER SUPPLY — Unit is factory wired for volt-
age shown on nameplate.
When installing units, provide a disconnect, per NEC
(National Electrical Code) requirements, of adequate size
(Table 2).
All field wiring must comply with NEC and local
requirements.
Route power lines through control box access panel or unit
basepan (Fig. 4 and 5) to connections as shown on unit wiring
diagram and Fig. 11.
Set heat anticipator settings as indicated in Table 3. Settings
may be changed slightly to provide a greater degree of comfort
for a particular installation.
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% and the current
must be balanced within 10%.
The correct power phasing is critical in the operation of the
scroll compressors. An incorrect phasing will cause the
compressor to rotate in the wrong direction. This may lead
to premature compressor failure.
Use the following formula to determine the percentage of
voltage imbalance.
Percentage of Voltage Imbalance
TB1 MAXIMUM WIRE SIZE
max voltage deviation from average voltage
= 100 x
VOLTAGE
460
UNIT
50TJ
All
average voltage
208/230,380
575
EXAMPLE: Supply voltage is 460-3-60.
350 kcmil
2/0
2/0
AB = 452 v
BC = 464 v
AC = 455 v
LEGEND
EQUIP — Equipment
GND — Ground
kcmil — Thousand Circular Mils
455 + 464 + 455
NEC
TB
— National Electrical Code
— Terminal Block
Average Voltage =
3
Fig. 11 — Field Power Wiring Connections
1371
=
3
= 457
Determine maximum deviation from average voltage:
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance:
THERMOSTAT ASSEMBLY
REMOVABLE JUMPER
L
RC
Y1
Y1
Y2
Y2
W1
W1
G
G
C
C
X
X
RH
W2
W2
R
7
Percentage of Voltage Imbalance = 100 x
457
= 1.53%
UNIT LOW-VOLTAGE CONNECTIONS
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
Fig. 12 — Field Control Thermostat Wiring
8
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Table 2 — Electrical Data
NOMINAL
VOLTAGE
(3 Ph,
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
POWER
SUPPLY
OFM
IFM
FLA
UNIT
50TJ
EXHAUST
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA MOCP†
60 Hz)
—
—
—
—
—
—
81/81 100/100
85/86 110/110
4.6 18.8
—
—
26/34
71/82 102/116 110/125
71/82 108/122 110/125
4.6 18.8 26/34
208/230 187 253 28.8 195 28.8 195
3
3
0.5
0.5
1.7
1.7
3.7 10.5/11.0
—
—
42/56 117/135 159/149 175/175
4.6 18.8 42/56 117/135 165/155 175/175
—
—
56/75** 156/180 169/194 200/225
4.6 18.8 56/75** 156/180 175/200 200/225
—
—
—
—
—
—
43
45
50
60
2.3 6.0
—
—
20
20
30
30
43
46
50
60
380
342 418 15.0 123 15.0 123
3.7
3.9
2.3 6.0
016
(15 Tons)
—
—
35
35
52
52
70
73
80
80
2.3 6.0
—
—
—
—
—
—
40
43
50
50
2.3 6.0
—
—
32
32
39
39
55
58
60
60
2.3 6.0
460
575
414 508 14.7 95 14.7 95
3
3
3
0.5
0.5
0.5
0.8
0.75
1.7
3.7
3.0
4.8
3.9
—
—
55
55
80**
80**
—
—
50**
50**
66
66
96
96
—
—
48
48
72
75
102
105
30
32
67
70
80
80
110
110
40
40
70
70
2.3 6.0
—
—
2.3 6.0
—
—
2.1 4.8
518 633 10.8 80 10.8 80
—
—
2.1 4.8
—
—
—
—
26/34
—
—
87/87 110/110
92/92 110/110
4.6 18.8
—
—
71/82 109/122 110/125
71/82 114/128 125/150
4.6 18.8 26/34
208/230 187 253 30.1 225 28.8 195
5.0 15.8/15.8
—
—
42/56 117/135 166/155 175/175
4.8 18.8 42/56 117/135 172/161 175/175
—
—
56/75** 156/180 176/200 200/225
4.6 18.8 56/75** 156/180 182/206 200/225
020
(18 Tons)
—
—
—
—
—
—
44
47
50
60
2.3 6.0
—
—
32
32
39
39
59
61
60
70
2.3 6.0
460
575
414 508 15.5 114 14.7 95
518 633 12.1 80 10.8 80
3
3
2
0.5
0.5
1
0.8
0.75
6.6
5.0
5.0
7.9
6.0
—
—
55
55
80**
80**
—
—
—
—
66
66
96
96
—
—
—
—
76
79
106
109
34
36
90
90
125
125
40
40
2.3 6.0
—
—
2.3 6.0
—
—
2.1 4.8
—
—
116/116 150/150
120/120 150/150
4.6 18.8
—
—
26/34
71/82 120/134 150/150
71/82 126/140 150/150
4.6 18.8 26/34
208/230 187 253 37.8 239 30.1 225
7.5 25.0/25.0
—
—
42/56 117/135 178/166 200/175
4.6 18.8 42/56 117/135 183/172 200/175
—
—
56/75** 156/180 187/211 200/225
4.6 18.8 56/75** 156/180 193/217 200/225
—
—
—
—
—
—
66
68
80
80
2.3 6.0
—
—
20
20
35
35
30
30
52
52
66
68
84
87
80
80
90
90
380
342 418 21.2 145 16.7 140
2
1
3.9
7.5
15.0
024
(20 Tons)
2.3 6.0
—
—
2.3 6.0
—
—
—
—
—
—
57
59
70
70
2.3 6.0
—
—
32
32
39
39
65
68
70
70
2.3 6.0
460
575
414 508 17.2 125 15.5 114
518 633 12.4 80 12.1 80
2
2
1
1
3.3
3.4
7.5
7.5
13.0
10.0
—
—
55
55
80**
80**
—
—
66
66
96
96
—
—
82
85
112
115
44
46
90
90
125
125
50
50
2.3 6.0
—
—
2.3 6.0
—
—
2.1 4.8
9
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Table 2 — Electrical Data (cont)
NOMINAL
VOLTAGE
(3 Ph,
COMPRESSOR
No. 1 No. 2
VOLTAGE
RANGE
POWER
ELECTRIC
HEAT*
POWER
SUPPLY
OFM
IFM
FLA
UNIT
50TJ
EXHAUST
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp
FLA LRA
kW
FLA
MCA MOCP†
60 Hz)
—
—
—
—
—
—
130/130 150/150
135/135 175/175
4.6 18.8
—
—
26/34
71/82 130/138 150/150
71/82 135/143 175/175
4.6 18.8 26/34
208/230 187 253 41.0 350 37.8 239
2
2
1
1
6.6
3.9
10.0 28.0/28.0
—
—
42/56 117/135 181/170 200/175
4.6 18.8 42/56 117/135 187/176 200/200
—
-
56/75** 156/180 191/215 200/225
4.6 18.8 56/75** 156/180 197/221 200/225
—
—
—
—
—
—
73
76
90
90
2.3 6.0
—
—
20
20
30
30
73
76
90
90
380
342 418 21.8 151 21.2 145
10.0
17.0
028
2.3 6.0
(25 Tons)
—
—
35
35
52
52
87
90
90
90
2.3 6.0
—
—
—
—
—
—
66
68
80
80
2.3 6.0
—
—
32
32
39
39
67
70
80
80
2.3 6.0
460
575
414 508 21.8 158 17.2 125
518 633 17.3 125 12.4 80
2
2
1
1
2.8
3.4
10.0
10.0
14.6
13.0
—
—
55
55
80**
80**
—
—
66
66
96
96
—
—
84
87
114
117
54
56
90
2.3 6.0
100
—
—
125
125
70
70
2.3 6.0
—
—
2.1 4.8
LEGEND
FLA — Full Load Amps
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
452 + 464 + 455
3
Average Voltage =
MOCP— Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps
1371
3
=
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v,
380 v, 480 v, and 575 v. Heaters are rated at 240 v, 380 v, 480 v, or
600 v. If power distribution voltage to unit varies from rated heater
voltage, heater kW will vary accordingly.
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
†Fuse or HACR circuit breaker.
(AC) 457 – 455 = 2 v
**Heaters are field installed only.
NOTES:
Maximum deviation is 7 v.
1. In compliance with NEC requirements for multimotor and combi-
nation 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
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percent of voltage imbalance.
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
% Voltage Imbalance
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
max voltage deviation from average voltage
= 100 x
average voltage
3. MCA calculation for units with electric heaters over 50 kW =
(1.25 x IFM amps) + (1.00 x heater FLA).
10
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OPTIONAL NON-FUSED DISCONNECT — On units with
the optional non-fused disconnect, incoming power will be
wired into the disconnect switch. Refer to Fig. 13 for wiring
for 100 and 200 amp disconnect switches. Units with an
MOCP under 100 will use the 100 amp disconnect switch.
Units with an MOCP over 100 will use the 200 amp discon-
nect switch. Refer to the applicable disconnect wiring diagram.
To prevent breakage during shipping, the disconnect han-
dle and shaft are shipped and packaged inside the unit control
box. Install the disconnect handle before unit operation. To in-
stall the handle and shaft, perform the following procedure:
1. Open the control box door and remove the handle and
shaft from shipping location.
2. Loosen the Allen bolt located on the disconnect switch.
The bolt is located on the square hole and is used to hold
the shaft in place. The shaft cannot be inserted until the
Allen bolt is moved.
Step 7 — Make Outdoor-Air Inlet Adjustments
MANUAL OUTDOOR-AIR DAMPER — All units (except
those equipped with a factory-installed economizer) have a
manual outdoor-air damper to provide ventilation air. Damper
can be preset to admit up to 25% outdoor air into return-air
compartment. To adjust, loosen securing screws and move
damper to desired setting. Then retighten screws to secure
damper (Fig. 14).
OPTIONAL ECONOMI$ER
EconoMi$er Motor Control Module (Fig. 15-17) — Set the
ECONSP dial to the ‘‘D’’ setting (Fig. 16). The control module
is located on the EconoMi$er motor. See Fig. 15 and 17.
Damper Vent Position Setting
1. Set fan switch at ON position (continuous fan operation)
and close night switch if used.
2. Set system selector switch to OFF position.
3. Insert the disconnect shaft into the square hole on the dis-
connect switch. The end of the shaft is specially cut and
the shaft can only be inserted in the correct orientation.
3. Turn Min Pos (%) dial slowly until dampers assume de-
sired vent position. Do not manually operate EconoMi$er
motor since damage to motor will result.
4. Tighten the Allen bolt to lock the shaft into position.
5. Close the control box door.
6. Attach the handle to the external access door with the two
screws provided. When the handle is in the ON position,
the handle will be vertical. When the handle is in the OFF
position, the handle will be horizontal.
7. Turn the handle to the OFF position and close the door.
The handle should fit over the end of the shaft when the
door is closed.
8. The handle must be in the OFF position to open the con-
trol box door.
OPTIONAL CONVENIENCE OUTLET — On units with
optional convenience outlet, a 115-v GFI (ground fault inter-
rupt) convenience outlet receptacle is provided for field wiring.
7
Field wiring should be run through the /8-in. knockout pro-
Fig. 14 — 25% Outdoor-Air Section Details
vided in the basepan near the return air opening.
6T3 4T2 2T1 LOAD
CONTROL
MODULE
5L3 3L2 1L1 LINE
ACTUATOR
ECONOMI$ER
NOTE: The disconnect takes the place of TB-1 as shown on the unit
wiring diagram label and the component arrangement label.
Fig. 15 — EconoMi$er Damper Assembly
— End View
Fig. 13 — Optional Non-Fused Disconnect Wiring
11
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Table 3 — Heat Anticipator Settings
5. Loosen sheet metal screws for base unit top panel located
above outdoor-air inlet opening, and remove screws for
hood side panels located on the sides of the outdoor-air
inlet opening.
6. Match notches in hood top panel to unit top panel screws.
Insert hood flange between unit top panel flange and unit.
Tighten screws.
7. Hold hood side panel flanges flat against unit, and install
screws removed in Step 5.
8. Insert outdoor-air inlet screens and spacer in channel cre-
ated by lower filter retainer and filter support bracket.
UNIT
50TJ
UNIT
VOLTAGES
kW*
STAGE 1
STAGE 2
26/34
42/56
56/75
.40
.66
.66
.66
.40
.66
.40
.66
.40
.66
.66
.66
208/230-3-60
20
35
32
55
80
50
.40
.40
.40
.40
.66
.66
380-3-60
460-3-60
575-3-60
016-028
9. Attach remaining short section of filter support bracket.
*Heater kW is based on heater voltage of 208 v, 240 v, 380 v, 480 v,
and 575 v.
OUTDOOR AIR ENTHALPY SENSOR INSTALLA-
TION — Perform the following procedure to install the out-
door air enthalpy sensor (part no. CROUTENT001A00).
1. Remove the outdoor air temperature sensor cover. See
Fig. 21. Save cover and screws.
2. Disconnect the wiring from the installed outdoor air tem-
perature sensor. See Fig. 22.
1
3. Use a /4-in. nut driver to remove the 2 screws securing
the outdoor air temperature sensor to the sheet metal.
4. Mount the outdoor air enthalpy sensor in the outdoor air
temperature sensor location using the screws removed in
Step 3.
5. Connect the outdoor air enthalpy sensor wiring harness to
the EconoMi$er control module and sensor.
Fig. 16 — EconoMi$er Control Module
Adjustment Potentiometers
6. Re-install sensor cover saved from Step 1.
RETURN AIR TEMPERATURE SENSOR OR RETURN
AIR ENTHALPY SENSOR INSTALLATION — Perform the
following procedure to install the return air temperature sensor
(part no. CRRETTMP001A00) or return air enthalpy sensor
(part no. CRRETENT001A00).
1. Attach the sensor to the mounting bracket using 2 self-
tapping 1/2-in. screws provided.
2. Mount the bracket to the inside of the return air opening
1
flange using a /4-in. nut driver and 2 no. 6 sheet metal
screws.
NOTE: The sensor must be mounted in an upright position.
3. Feed the sensor wiring through the bushing in
EconoMi$er to secure wires.
4. Route sensor wiring harness from sensor to EconoMi$er
control module. Secure wiring harness to the original har-
ness using tie wraps.
CONTROL MODULE
ACTUATOR
Fig. 17 — EconoMi$er Control Module Location
5. Wire the sensor to the EconoMi$er control module. See
Fig. 23 and 24.
Step 8 — Install Outdoor-Air Hood — The same
type of factory-installed hood is used on units with 25% air
ventilation and units with an EconoMi$er.
NOTE: The hood top panel, upper and lower filter retainers,
hood drain pan, baffle (028), and filter support bracket are
secured opposite the condenser end of the unit. The screens,
hood side panels, remaining section of filter support bracket,
seal strip, and all other hardware are in a package located
inside the return-air filter access panel (Fig. 18).
1. Attach seal strip to upper filter retainer. See Fig. 19.
2. Assemble hood top panel and side panels, upper filter re-
tainer, and hood drain pan (Fig. 20).
3. Secure lower filter retainer and long section of filter sup-
port bracket to unit. See Fig. 20. Leave screws loose on
028 units.
4. Slide baffle (size 028 unit) behind lower filter retainer and
tighten screws.
Fig. 18 — Outdoor-Air Hood Component Location
12
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OUTSIDE AIR SENSOR
SENSOR
COVER
Fig. 19 — Seal Strip Location
(Air Hood Cross-Sectional View)
BAFFLE (028 ONLY)
Fig. 21 — Outdoor-Air Sensor Location
MOUNTING SCREW
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
SENSOR
WIRING
CONNECTIONS
MOUNTING
SCREW
HOOD SIDE
PANELS (2)
HOOD TOP
PANEL
BAFFLE
(028 ONLY)
WIRING
HARNESS
Fig. 22 — Outdoor-Air Sensor Details
LOWER
FILTER
RETAINER
Refer to Table 4 to determine the sensors required for each
strategy.
FILTER SUPPORT
BRACKET
Differential Enthalpy Switchover Strategy — The differen-
tial enthalpy switchover strategy must be selected manually, if
required. To enable, press and hold the CONFIG button for 30
seconds, then release. The LED will flash twice to indicate the
change of configuration.
HOOD DRAIN PAN
UPPER FILTER RETAINER
NOTE: The outdoor-air hood comes with a baffle which is used on
028 units only; discard baffle for 016-024 units.
To return to single enthalpy mode, press and hold the CON-
FIG button for 30 seconds. The LED will flash once to indicate
the change of configuration.
Fig. 20 — Outdoor-Air Hood Details
COMMISSIONING — The EconoMi$er saves energy when
it uses outdoor air to provide free cooling instead of mechani-
cal air conditioning. The EconoMi$er switchover strategy de-
termines if the outdoor air is suitable for free cooling. The
EconoMi$er chooses the switchover strategy with the most en-
ergy savings, provided that the required sensors are connected
and functioning normally.
DISCHARGE AIR THERMISTOR (DAT) — The discharge
air thermistor is factory-mounted on the supply-fan housing in
the fan section of the unit. The DAT is factory-wired to the
EconoMi$er Control Module.
CO2 CONTROL SETUP — If a CO2 sensor is not being
used, proceed to the next section. If a CO2 sensor is being used,
perform the following:
1. Determine the value at which you want the minimum
position of the dampers to begin opening to allow a
greater amount of outdoor air to enter. The range is
800 to 1,400 ppm.
IMPORTANT: If a sensor stops functioning nor-
mally (becomes unreliable), the EconoMi$er
switches to the next best strategy.
2. Locate the CO2 SP (PPM) potentiometer and adjust to the
desired set point. See Fig. 16.
13
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MECHANICAL COOLING LOCKOUT — Determine the
outdoor-air temperature at which you want the mechanical
cooling (compressors) to be disabled. Locate the mechanical
cooling lockout (MECH CLG LOCKOUT) potentiometer. To
disable this feature, turn the potentiometer counterclockwise
(CCW) to the OFF position. Otherwise, set the value between
10 and 60 F. Mechanical cooling will not operate when the out-
door air temperature is below this value. See Fig. 16.
DRY BULB CHANGEOVER SET UP — Determine the dry
bulb changeover set point from Table 5. The settings are A, B,
C and D. Locate the ECON SP potentiometer and set the dry
bulb changeover set point. See Fig. 16. When the OAT is above
this set point, the damper is limited to minimum position
setting.
If a potentiometer fails, its setting will default to the values
in Table 6.
Table 4 — EconoMi$er Switchover Control Strategy
SENSORS REQUIRED
ECONOMI$ER SWITCHOVER
STRATEGY
Outdoor Air Temperature
Outdoor Air Enthalpy
Return Air Temperature
Return Air Enthalpy
Dry Bulb
X
Single Enthalpy
X
X
Differential Temperature
Differential Enthalpy*
X
X
X
*Must be selected manually.
Table 5 — Changeover Set Points
Table 6 — Default Potentiometer Settings
POTENTIOMETER
CO2 SP (PPM)
MECH CLG LOCKOUT
ECON SP
DEFAULT SETTING
SETTINGS
Dry Bulb (°F)
Single Enthalpy* (Btu/lb)
Differential Temperature*
(°F, Not Adjustable)
Differential Enthalpy*
(Btu/lb, Not Adjustable)
A
B
C
D
1,000
50 F
D
73
27
69
25
66
24
63
22
2
1
2
1
2
1
2
1
MIN POS (%)
20
*Field-installed accessory.
LEGEND
— Common
COM
DAT
DM
GND
OAH
OAT
POT
RAH
RAT
REM
— Discharge Air Thermistor
— Damper Motor
— Ground
— Outdoor-Air Enthalpy Sensor
— Outdoor-Air Temperature Sensor
— Potentiometer
— Return-Air Enthalpy Sensor
— Return-Air Temperature Sensor
— Remote
*OAT sensor shipped with economizer option. OAH, RAT, RAH and CO2 are field-installed accessories.
Fig. 23 — Typical EconoMi$er Sensor Wiring
14
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VENTILATION AIR (Minimum Position Set Up) — If ven-
tilation air is not required, skip this section. If ventilation air is
required, perform the following:
1. The indoor fan must be on to set the ventilation air.
Either put the thermostat in the continuous fan mode or
jumper the R and G terminals at the rooftop unit con-
nection board.
2. Locate the minimum position (MIN POS) potentiometer.
Turn the potentiometer full CCW to fully close the out-
door air dampers. Turn the potentiometer gradually
clockwise (CW) to the desired position. See Fig. 16.
3. Replace the filter access panel. See Fig. 18. Ensure the fil-
ter access panel is securely engaged.
Personal Injury Hazard. Avoid possible injury by keep-
ing fingers away from damper blades.
Step 9 — Install All Accessories — After all the
factory-installed options have been adjusted, install all field-
installed accessories. Refer to the accessory installation instruc-
tions included with each accessory.
MOTORMASTER®
I
CONTROL INSTALLATION
(50TJ016 and 020 Only)
Install Field-Fabricated Wind Baffles — Wind baffles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low ambient temperatures. See Fig. 25 for baffle
details. Use 20-gage, galvanized sheet metal, or similar
corrosion-resistant metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be 1/4-in. diameter and
5/8-in. long. Drill required screw holes for mounting baffles.
4. Calculate the minimum airflow across the EconoMi$er.
a. Calculate % of outside air using the following
formula.
% Outdoor air through EconoMi$er
Mixture Temp – Return Air Temp
% Outdoor air =
Outdoor Temp – Return Air Temp
b. Multiply total CFM by percentage outdoor air, this
gives outdoor air volume in CFM.
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only. Use care
when drilling holes.
Unoccupied Control
(Part number on the control
must be AD-DME1701-1
or AD-DME1711-1.)
Outdoor Air Enthalpy
CROUTENT001A00
Unoccupied
Contact
470 ohm
5 watt
Resistor
T
Violet
O
C
O
M
U
T
T
PW
24 VAC must be present
on BI for the system to be
unoccupied.
Tan
OAT
COM
OAH
+15V
RAT
COM
RAH
+15V
Violet
White
Red
Return Air Enthalpy
CRRETENT001A00
Tan
Violet
Violet
White
Red
T
O
CO2 Sensors:
33ZCSENCO2
C
O
M
U
T
T
PW
2 to 10 VDC at
0 to 2000 ppm
CO (+)
2
CO
2
COM
DAT
COM
REM
POT
COM
LED
Remote
Minimum Position
Line
Voltage
1k ohm Potentiometer
COM
20 mA LED
Remote
LED
Field-supplied Wiring
Wiring Included
Fig. 24 — Typical EconoMi$er Sensor Wiring
15
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Install Motormaster I Controls — Only one Motormaster I
control is required per unit. The Motormaster I control must be
used in conjunction with the Accessory 0° F Low Ambient Kit
(purchased separately). The Motormaster I device controls out-
door fan no. 1 while outdoor fans no. 2 and 3 are sequenced off
by the Accessory 0° F Low Ambient Kit.
Accessory 0° F Low Ambient Kit — Install the Accessory 0° F
Low Ambient Kit per instruction supplied with accessory.
Sensor Assembly — Install the sensor assembly in the location
shown in Fig. 26.
Motor Mount — To ensure proper fan height, replace the exist-
ing motor mount with the new motor mount provided with
accessory.
Transformer (460 and 575-v Units Only) — On 460 and
575-volt units a transformer is required. The transformer is
provided with the accessory and must be field-installed.
Motormaster I Control — Recommended mounting location is
on the inside of the panel to the left of the control box. The
control should be mounted on the inside of the panel, verti-
cally, with leads protruding from bottom of extrusion.
MOTORMASTER® III CONTROL INSTALLATION
(50TJ024 and 028 Only)
Install Field-Fabricated Wind Baffles — Wind baffles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low ambient temperatures. See Fig. 25 for baffle
details. Use 20-gage, galvanized sheet metal, or similar
corrosion-resistant metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be 1/4-in. diameter and
5/8-in. long. Drill required screw holes for mounting baffles.
NOTE: Dimensions in ( ) are in mm.
Fig. 25 — Wind Baffle Details
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only. Use care
when drilling holes.
NOTE: If unit power is supplied through the roof curb and
basepan of the unit, mount the Motormaster III control on the
corner post adjacent to the conduit running from the basepan to
the bottom of the control box.
Replace Outdoor Motor — Replace outdoor fan motor no. 1
with motor included in accessory kit. Existing motor is not
Motormaster® III compatible.
Install Motormaster III Controls — Only one Motormaster
III control is required per unit.
Sensor — Install the sensor for thermistor input control in the
location shown in Fig. 27. Connect sensor leads to the purple
and grey control signal leads on the Motormaster III control.
Signal Selection Switch — Remove the cover of the Motor-
master III control. Set the switch to accept the thermistor sen-
sor input signal. Set the frequency to match the unit power sup-
ply (60 Hz).
Step 10 — Install Humidistat for Optional
MoistureMiser Dehumidification Package —
MositureMiser dehumidification package operation can be
controlled by field installation of a Carrier-approved humidis-
tat. To install the humidistat perform the following procedure:
1. Locate humidistat on a solid interior wall in the condi-
tioned space. Location should be a well ventilated area
to sense average humidity.
2. Route thermostat cable or equivalent single leads of col-
ored wire from Humidistat terminals through conduit in
unit to the low voltage connection on the 2-pole terminal
strip (TB3) as shown in Fig. 28 and Fig. 29.
Motormaster III Control — Recommended mounting location
is beneath the control box, mounted to the partition that sepa-
rates the control box section from the indoor section.
16
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SENSOR
LOCATION
SENSOR
LOCATION
SENSOR
LOCATION
SENSOR
LOCATION
HAIRPIN END
HAIRPIN END
HAIRPIN END
HAIRPIN END
50TJ016
50TJ020
50TJ024
50TJ028
NOTE: All sensors are located on the eighth hairpin up from the
bottom.
NOTE: All sensors are located on the eighth hairpin up from the
bottom.
Fig. 27 — Motormaster III Sensor Locations
Fig. 26 — Motormaster® I Sensor Locations
LEGEND
LLSV — Liquid Line Solenoid Valve
LPS
TB
— Low Pressure Switch
— Terminal Block
TRAN — Transformer
Fig. 28 — Typical MoistureMiser Dehumidification Package
Humidistat Wiring Schematic (460V Unit Shown)
17
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1. Connect service gages to suction and discharge pressure
fittings.
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:
1. Note that the evaporator fan is probably also rotating in
the wrong direction.
2. Turn off power to the unit.
3. Reverse any two of the incoming power leads.
4. Turn on power to the compressor.
The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When compressors are rotating in the wrong direction,
the unit will have increased noise levels and will not provide
heating and cooling.
Fig. 29 — Typical MoistureMiser Dehumidification
Package Control Box
After a few minutes of reverse operation, the scroll com-
pressor internal overload protection will open, which will acti-
vate the unit’s lockout and requires a manual reset. Reset is ac-
complished by turning the thermostat on and off.
START-UP
Use the following information and Start-Up Checklist on
page CL-1 to check out unit PRIOR to start-up.
Evaporator Fan — Fan belt and variable pulleys are fac-
tory installed. Remove tape from the fan pulley. See Table 7 for
Air Quantity Limits. See Tables 8-10 for Fan Performance
data. Be sure that fans rotate in the proper direction. See
Tables 11-13 for Static Pressure information for accessories
and options. See Table 14 for fan rpm at various fan motor pul-
ley settings. To alter fan performance, see Evaporator-Fan Per-
formance Adjustment section, page 25.
Unit Preparation — Check that unit has been installed in
accordance with these installation instructions and all applica-
ble codes.
Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.
Crankcase Heater (Size 028 and Units with
MoistureMiser Dehumidification Package
Only) — Heater is energized as long as there is power to unit
and compressor is not operating.
Table 7 — Air Quantity Limits
UNIT
MINIMUM CFM
MAXIMUM CFM
50TJ
016
020
024
028
4500
5400
6000
7000
7,500
9,000
10,000
11,250
IMPORTANT: Unit power must be on for 24 hours prior
to start-up. Otherwise, damage to compressor may
result.
Condenser Fans and Motors — Fans and motors
are factory set. Refer to Condenser-Fan Adjustment section
(page 26) as required.
Compressor Mounting — Compressors are internally
spring mounted. Do not loosen or remove compressor hold-
down bolts.
Return-Air Filters — Check that correct filters are in-
stalled in filter tracks. See Table 1. Do not operate unit without
return-air filters.
Refrigerant Service Ports — Each refrigerant sys-
tem has a total of 3 Schrader-type service gage ports. One port
is located on the suction line, one on the compressor discharge
line, and one on the liquid line. In addition Schrader-type
valves are located underneath the low-pressure switches. Be
sure that caps on the ports are tight.
Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
Accessory EconoMi$er Adjustment — Remove fil-
ter access panel. Check that outdoor-air damper blades are
closed and return-air damper blades are open.
EconoMi$er operation and adjustment is described in Base
Unit Operation and EconoMi$er Adjustment sections
(pages 23 and 27), respectively.
Compressor Rotation — It is important to be certain
the compressors are rotating in the proper direction. To deter-
mine whether or not compressors are rotating in the proper di-
rection:
18
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Table 8 — Fan Performance — 50TJ016
50TJ016 (15 TONS)*
Airflow
Available External Static Pressure (in. wg)
0.2
0.4
0.6
0.8
1.0
1.2
(Cfm)
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
684 1.28 1102
715 1.47 1265
747 1.67 1442
779 1.90 1635
812 2.14 1844
845 2.40 2068
878 2.68 2309
912 2.98 2566
791 1.49 1283
817 1.68 1451
844 1.89 1633
872 2.12 1831
901 2.37 2044
887 1.70 1466
910 1.90 1638
977 1.92 1652 1061 2.13 1841 1139 2.36 2034
997 2.12 1828 1078 2.34 2021 1155 2.57 2217
934 2.12 1825 1018 2.34 2019 1097 2.57 2216 1171 2.80 2416
959 2.35 2027 1040 2.58 2226 1117 2.81 2426 1189 3.05 2629
985 2.60 2245 1063 2.84 2448 1138 3.07 2652 1209 3.31 2858
931 2.64 2273 1011 2.87 2478 1087 3.11 2685 1160 3.35 2893 1229 3.60 3103
961 2.92 2518 1039 3.16 2728 1112 3.41 2939 1183 3.65 3151 1250 3.90 3365
992 3.22 2780 1067 3.47 2994 1138 3.72 3209 1207 3.97 3425 1273 4.22 3642
946 3.29 2841 1023 3.55 3059 1096 3.80 3277 1165 4.05 3496 1232 4.31 3716
—
—
—
—
—
—
—
—
—
981 3.63 3133 1055 3.89 3355 1125 4.15 3578
1016 3.99 3443 1087 4.25 3669
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
50TJ016 (15 TONS)* (cont)
Available External Static Pressure (in. wg)
1.6 1.8 1.9
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
Airflow
1.4
2.0
(Cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
1214 2.59 2230 1285 2.82 2430 1353 3.05 2633 1386 3.17 2736 1418 3.29 2839
1228 2.80 2417 1297 3.04 2619 1364 3.27 2825 1396 3.40 2928 1428 3.52 3033
1243 3.04 2618 1311 3.27 2823 1376 3.51 3031 1408 3.64 3136 1439 3.76 3242
1259 3.29 2835 1326 3.53 3043 1390 3.77 3254 1421 3.90 3360 1452 4.02 3467
1277 3.56 3067 1342 3.80 3278 1405 4.05 3492 1435 4.17 3600 1466 4.30 3708
1295 3.84 3316 1359 4.09 3530 1421 4.34 3746
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1315 4.15 3580
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND
2. Static pressure losses (i.e., EconoMi$er) must be added to
external static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 11 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that
the full horsepower and watts range of the motor can be utilized
with confidence. Using your fan motors up to the watts or bhp
rating shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact
your Carrier representative for details.
Bhp
FIOP
—
—
Brake Horsepower
Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 891 to 1179 rpm (for
208/230, 380 and 460 v units) or 1159 to 1429 rpm (for 575-v
units). Alternate high-static drive range is 1227 to 1550 (for 208/
230, 380, and 460 v units). The alternate high-static drive is not
available for 50TJ016 575-v units. Other rpms require a field-sup-
plied drive.
NOTES:
1. Maximum continuous bhp is 4.25 (208/230, 380 and 460 v) or
3.45 (575 v) and the maximum continuous watts are 3775 (208/
230, 380, and 460 v) or 3065 (575 v). Do not adjust motor rpm
such that motor maximum bhp and/or watts is exceeded at the
maximum operating cfm.
19
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Table 9 — Fan Performance — 50TJ020 and 024
50TJ020, 024 (18 and 20 TONS)*
Available External Static Pressure (in. wg)
Airflow
0.2
0.4
0.6
0.8
1.0
1.2
(Cfm)
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
5,500
6,000
6,500
7,000
7,500
8,000
8,500
682 1.99 1675
730 2.38 2005
778 2.82 2373
828 3.31 2780
878 3.84 3227
928 4.42 3715
760 2.29 1922
802 2.68 2257
846 3.13 2630
892 3.62 3042
938 4.15 3494
832 2.59 2177
871 2.99 2516
911 3.44 2893
901 2.90 2441
935 3.31 2783
965 3.22 2712 1027 3.56 2990
997 3.63 3057 1056 3.97 3337
972 3.76 3164 1031 4.09 3440 1087 4.43 3722
953 3.94 3310 1011 4.26 3583 1067 4.59 3863 1121 4.93 4148
996 4.48 3766 1051 4.81 4043 1105 5.14 4326 1156 5.49 4613
985 4.74 3986 1040 5.07 4263 1093 5.40 4544 1144 5.74 4830 1194 6.09 5120
979 5.05 4245 1033 5.38 4521 1085 5.71 4801 1136 6.05 5086 1185 6.39 5375 1232 6.74 5669
9,000 1030 5.73 4817 1082 6.06 5098 1131 6.40 5382 1180 6.74 5671 1227 7.09 5964 1272 7.44 6260
9,500 1082 6.46 5433 1131 6.80 5718 1178 7.14 6007 1225 7.49 6299 1270 7.84 6595 1313 8.20 6895
10,000 1134 7.25 6093 1180 7.59 6382 1226 7.94 6675 1270 8.29 6971 1313 8.65 7271 1356 9.01 7574
50TJ020, 024 (18 and 20 TONS)* (cont)
Available External Static Pressure (in. wg)
Airflow
1.4
1.6
1.8
1.9
2.0
(Cfm)
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
5,500 1086 3.89 3275 1142 4.24 3567 1197
6,000 1112 4.31 3623 1167 4.66 3915 1219
6,500 1142 4.77 4010 1194 5.12 4304 1245
7,000 1173 5.28 4438 1224 5.63 4733 1273
7,500 1207 5.83 4906 1255 6.19 5203 1302
8,000 1242 6.44 5415 1289 6.80 5714 1334
8,500 1279 7.10 5966 1324 7.45 6268 1368
9,000 1317 7.80 6561 1360 8.16 6865 1403
9,500 1356 8.56 7198 1398 8.93 7505 1440
4.59 3864 1223 4.77 4015 1249 4.96 4167
5.01 4213 1245 5.19 4364 1270 5.37 4516
5.47 4602 1270 5.65 4754 1294 5.83 4906
5.98 5033 1296 6.17 5184 1320 6.35 5337
6.55 5504 1326 6.73 5657 1348 6.91 5810
7.16 6018 1357 7.34 6171 1379 7.52 6325
7.82 6573 1389 8.00 6728 1411 8.18 6883
8.53 7173 1424 8.71 7328 1445 8.90 7484
9.29 7815 1460 9.48 7972 1480 9.67 8129
10,000 1397 9.37 7881 1438 9.74 8190 1477 10.11 8503
—
—
—
—
—
—
LEGEND
(208/230, 575 v) or 8640 (380, 460 v). Do not adjust motor rpm
such that motor maximum bhp and/or watts is exceeded at the
maximum operating cfm.
Bhp
—
—
Brake Horsepower
FIOP
Factory-Installed Option
2. Static pressure losses (i.e., EconoMi$er) must be added to
external static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and casing
losses. See Table 12 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that
the full horsepower and watts range of the motor can be utilized
with confidence. Using your fan motors up to the watts or bhp
rating shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact
your Carrier representative for details.
Watts — Input Watts to Motor
*Standard low-medium static drive range for the 020 size is 910 to
1095 rpm. Standard low-medium static drive range for the 024 size
is 1002 to 1225 rpm. Alternate high-static drive range for the
020 size is 1069 to 1287. Alternate high-static drive range for the
024 size is 1193 to 1458 rpm. Other rpms require a field-supplied
drive.
NOTES:
1. Maximum continuous bhp for the 020 size is 5.90. Maximum
continuous bhp for the 024 size is 8.7 (208/230, 575 v) or 9.5
(380, 460 v). The maximum continuous watts for the 020 size is
5180. The maximum continuous watts for the 024 size is 7915
20
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Table 10 — Fan Performance — 50TJ028
50TJ028 (25 TONS)*
Available External Static Pressure (in. wg)
Airflow
0.2
0.4
0.6
0.8
1.0
1.2
(Cfm)
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
7,000
7,500
8,000
845 3.26 2693
896 3.82 3156
909 3.60 2979
969 3.96 3272 1028 4.32 3574 1083 4.70 3883 1137 5.08
4,200
4,698
5,243
5,838
6,483
7,179
7,929
8,733
9,594
956 4.17 3450 1014 4.54 3752 1069 4.91 4060 1123 5.29 4375 1174 5.68
948 4.43 3667 1005 4.80 3969 1060 5.17 4278 1112 5.56 4593 1163 5.94 4915 1213 6.34
8,500 1001 5.11 4226 1054 5.49 4537 1106 5.87 4853 1156 6.26 5175 1205 6.66 5504 1253 7.06
9,000 1053 5.85 4836 1104 6.23 5155 1154 6.63 5478 1202 7.02 5808 1248 7.43 6142 1294 7.84
9,500 1106 6.65 5498 1155 7.04 5824 1202 7.44 6155 1248 7.85 6492 1293 8.26 6833 1336 8.68
10,000 1159 7.52 6214 1206 7.92 6547 1251 8.33 6886 1295 8.74 7229 1338 9.16 7577 1380 9.59
10,500 1213 8.45 6984 1257 8.86 7325 1300 9.28 7671 1342 9.70 8020 1384 10.13 8375 1424 10.56
11,000 1266 9.45 7810 1309 9.87 8159 1350 10.29 8511 1391 10.73 8868 1431 11.16 9229 1470 11.60
11,250 1293 9.97 8245 1334 10.40 8597 1375 10.83 8953 1415 11.26 9313 1454 11.70 9677 1493 12.15 10,045
50TJ028 (25 TONS)* (cont)
Available External Static Pressure (in. wg)
Airflow
1.4
1.6
1.8
(Cfm)
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
7,000 1189 5.47 4,524 1239 5.87 4,854 1288 4.91 5191
7,500 1224 6.08 5,026 1272 6.48 5,362 1320 5.56 5703
8,000 1261 6.75 5,577 1307 7.16 5,917 1353 6.26 6263
8,500 1299 7.47 6,177 1344 7.89 6,523 1388 7.02 6873
9,000 1338 8.26 6,828 1382 8.68 7,179 1424 7.85 7534
9,500 1379 9.11 7,530 1421 9.54 7,887 1462 8.74 8247
10,000 1421 10.02 8,286 1461 10.46 8,648 1501 9.70 9014
10,500 1464 11.00 9,096 1503 11.45 9,464 1541 10.73 9835
11,000 1508 12.05 9,963 1546 12.50 10,336
—
—
—
—
—
—
11,250 1530 12.60 10,417
—
—
—
2. Static pressure losses (i.e., EconoMi$er) must be added to
external static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and casing
losses. See Table 12 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that
the full horsepower and watts range of the motor can be utilized
with confidence. Using your fan motors up to the watts or bhp
rating shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact
your Carrier representative for details.
LEGEND
Bhp
—
—
Brake Horsepower
Factory-Installed Option
Watts — Input Watts to Motor
FIOP
*Standard low-medium static drive range is 1066 to 1283 rpm. Alter-
nate high-static drive range is 1332 to 1550. Other rpms require a
field-supplied drive.
NOTES:
1. Maximum continuous bhp is 10.2 (208/230, 575 v) or 11.8 (380,
460 v) and the maximum continuous watts are 9510 (208/230,
575 v) or 11,000 (380, 460 v). Do not adjust motor rpm such
that motor maximum bhp and/or watts is exceeded at the maxi-
mum operating cfm.
21
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Table 11 — Accessory/FIOP Static Pressure (in. wg) — 50TJ016
CFM
COMPONENT
4500
0.04
0.22
5000
0.05
0.26
6000
0.07
0.35
7200
0.09
0.44
7500
0.10
0.46
EconoMi$er
Glycol Coil
Electric Heat (kW)
20
0.06
0.06
0.06
0.07
0.07
0.09
0.07
0.09
0.09
0.07
0.07
0.07
0.08
0.08
0.10
0.08
0.10
0.10
0.09
0.09
0.09
0.12
0.12
0.15
0.12
0.15
0.15
0.11
0.11
0.11
0.15
0.16
0.20
0.15
0.20
0.20
0.12
0.12
0.12
0.17
0.17
0.21
0.17
0.21
0.21
26/34
32
35
42/56
50
55
56/75
80
LEGEND
FIOP — Factory-Installed Option
NOTES:
1. The static pressure must be added to external static pressure.
The sum and the evaporator entering-air cfm should then be
used in conjunction with the Fan Performance tables to deter-
mine blower rpm and watts.
2. Heaters are rated at 240 v, 380 v, 480 v, and 600 v.
Table 12 — Accessory/FIOP Static Pressure (in. wg) — 50TJ020-028
CFM
COMPONENT
5400
0.06
0.30
6000
0.07
0.35
7200
0.09
0.44
9000
0.11
0.58
10,000
0.12
0.66
11,250
0.14
0.77
EconoMi$er
Glycol Coil
Electric Heat (kW)
20, 26/34
32
0.08
0.08
0.11
0.11
0.14
0.14
0.09
0.09
0.12
0.12
0.15
0.15
0.11
0.11
0.15
0.15
0.20
0.20
0.15
0.15
0.19
0.19
0.24
0.24
0.17
0.17
0.21
0.21
0.26
0.26
0.20
0.20
0.24
0.24
0.29
0.29
35, 42/56
55
56/75
80
LEGEND
FIOP — Factory-Installed Option
NOTES:
1. The static pressure must be added to 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.
2. Heaters are rated at 240 v, 380 v, and 480 v. There are no
575-v heaters.
Table 13 — MoistureMiser Dehumidification
Package Static Pressure Drop (in. wg)
CFM PER TON
UNIT SIZE
50TJ
UNIT NOMINAL
TONS
300
400
.071
.102
.126
.197
500
016
020
024
028
15
18
20
25
.040
.058
.071
.111
.111
.160
.197
.308
Table 14 — Fan Rpm at Motor Pulley Settings*
MOTOR PULLEY TURNS OPEN
UNIT
50TJ
1/
0
1
11/
2
21/
3
31/
4
41/
5
51/
2
6
2
2
2
2
2
016 (208/230, 380, 460 v)†
016 (208/230, 380, 460 v)**
†† ††
†† ††
†† ††
†† ††
†† ††
†† ††
†† ††
†† ††
†† ††
1179
1559
1429
1095
1287
1225
1458
1283
—
1150
1522
1403
1077
1265
1209
1434
1269
—
1121
1488
1376
1058
1243
1187
1407
1247
1551
1093
1455
1349
1040
1222
1165
1381
1225
1524
1064
1422
1323
1021
1200
1143
1354
1203
1497
1035
1389
1296
1002
1178
1120
1328
1182
1470
1006
1356
1269
984
1156
1098
1301
1160
1443
978
1323
1242
965
1134
1076
1275
1138
1415
949
920
1256
1188
928
1091
1031
1222
1095
1361
891
1289
1215
947
1112
1053
1248
1116
1388
1227
1159
910
1069
1002
1193
1066
1332
016 (575 v)†
020†
020**
024†
024**
028†
028**
*Approximate fan rpm shown.
†Indicates standard drive package.
**Indicates alternate drive package.
††Due to belt and pulley size, pulley cannot be set to this number of
turns open.
22
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FREEZE PROTECTION THERMOSTAT(S) — A freeze
protection thermostat (FPT) is located on the top and bottom of
the evaporator coil. It detects frost build-up and turns off the
compressor, allowing the coil to clear. Once frost has melted,
the compressor can be reenergized by resetting the compressor
lockout.
HEATING, UNITS WITH ECONOMI$ER (If Accessory or
Optional Heater is Installed) — When the room thermostat
calls for heat, the heating controls are energized as described in
the Heating, Units Without EconoMi$er section. The IFM is
energized and the EconoMi$er damper modulates to the mini-
mum position. When the thermostat is satisfied, the damper
modulates closed.
UNITS WITH MOISTUREMISER DEHUMIDIFICATION
PACKAGE — When thermostat calls for cooling, terminals G
and Y1 and/or Y2 and the compressor contactor C1 and/or C2
are energized. The indoor (evaporator) fan motor (IFM), com-
pressors, and outdoor (condenser) fan motors (OFM) start. The
OFMs run continuously while the unit is in cooling. As shipped
from the factory, both MoistureMiser dehumidification circuits
are always energized.
If MoistureMiser circuit modulation is desired, a field-
installed, wall-mounted humidistat is required. If the Mois-
tureMiser humidistat is installed and calls for the Mois-
tureMiser subcooler coil to operate, the humidistat internal
switch closes. This energizes the 3-way liquid line solenoid
valve coils (LLSV1 for circuit 1 and LLSV2 for circuit 2) of
the MoistureMiser circuits, forcing the warm liquid refrigerant
of the liquid line to enter the subcooler coils. See Fig. 30.
As the warm liquid passes through the subcooler coils, it is
exposed to the cold supply airflow coming off the evaporator
coils and the liquid is further cooled to a temperature approach-
ing the evaporator coil leaving-air temperature. The state of the
refrigerant leaving the subcooler coils is a highly subcooled liq-
uid refrigerant. The liquid then enters a thermostatic expansion
valve (TXV) where the liquid is dropped to the evaporator
pressure. The TXVs can throttle the pressure drop of the liquid
refrigerant and maintain proper conditions at the compressor
suction valves over a wide range of operating conditions. The
liquid proceeds to the evaporator coils at a temperature lower
than normal cooling operation. This lower temperature is what
increases the latent and sensible capacity of the evaporator
coils.
Base Unit Operation
COOLING, UNITS WITHOUT ECONOMI$ER — When
thermostat calls for cooling, terminals G and Y1 are energized.
The indoor (evaporator) fan contactor (IFC), and compressor
contactor no. 1 (C1) are energized and evaporator-fan motor,
compressor no. 1 and condenser fans start. The condenser-fan
motors run continuously while unit is cooling. If the thermostat
calls for a second stage of cooling by energizing Y2, compres-
sor contactor no. 2 (C2) is energized and compressor no. 2
starts.
HEATING, UNITS WITHOUT ECONOMI$ER (If Acces-
sory or Optional Heater is Installed) — Upon a call for heat-
ing through terminal W1, IFC and heater contactor no. 1 (HC1)
are energized. On units equipped for 2 stages of heat, when ad-
ditional heat is needed, HC2 is energized through W2.
COOLING UNITS WITH ECONOMI$ER — When the
OAT is above the ECON SP set point and the room thermostat
calls for Stage 1 cooling (R to G + Y1), the indoor-fan motors
(IFM) is energized and the EconoMi$er damper modulates to
minimum position. The compressor contactor and OFC are
energized to start the compressor and outdoor-fan motor
(OFM). After the thermostat is satisfied, the damper modulates
to the fully closed position when the IFM is deenergized.
When the OAT is below the ECON SP setting and the room
thermostat calls for Stage 1 cooling (R to G + Y1), the
EconoMi$er modulates to the minimum position when the
IFM is energized. The EconoMi$er provides Stage 1 of cooling
by modulating the return and outdoor air dampers to maintain a
55 F supply air set point. If the supply-air temperature (SAT) is
greater than 57 F, the EconoMi$er modulates open, allowing a
greater amount of outdoor air to enter the unit. If the SAT drops
below 53 F, the outdoor air damper modulates closed to reduce
the amount of outdoor air. When the SAT is between 53 and
57 F, the EconoMi$er maintains its position.
If outdoor air alone cannot satisfy the cooling requirements
of the conditioned space, and the OAT is above the MECH
CLG LOCKOUT set point, the EconoMi$er integrates free
cooling with mechanical cooling. This is accomplished by the
strategies below.
NOTE: Compressors have a two-minute Minimum On and
Minimum Off, which are accomplished by the strategies
below.
1. If Y1 is energized, and the room thermostat calls for Y2
(2-stage thermostat), the compressor and OFC are ener-
gized. The position of the EconoMi$er damper is main-
tained at its current value.
2. If Y1 is energized for more than 20 minutes, and Y2 is
not energized (whether or not a 2-stage thermostat is
used), the compressor and OFC are energized. The posi-
tion of the EconoMi$er damper is maintained at its cur-
rent value.
3. If Y1 is energized, and compressor no. 1 is already ener-
gized (see Step 2) and the room thermostat calls for Y2,
compressor no. 1 continues to operate. If Y2 remains
energized for more than 20 minutes, compressor no. 2 is
energized.
NOTE: Compressor no. 2 cannot be energized unless there is a
signal for Y2 from the space thermostat.
4. If compressor no. 2 is energized, and the Y2 signal from
the thermostat is satisfied, compressors 1 and 2 are deen-
ergized. Re-asserting Y2 will start compressor no. 1 and
(after a 20-minute interstage delay) compressor no. 2.
5. If compressor no. 1 is energized and the thermostat is sat-
isfied, compressor no. 1, the OFM, and IFM are deener-
gized and the EconoMi$er modulates closed.
The 2-phase refrigerant passes through the evaporators and
is changed into a vapor. The air passing over the evaporator
coils will become colder than during normal operation as a re-
sult of the colder refrigerant temperatures. However, as it pass-
es over the subcooler coils, the air will be warmed, decreasing
the sensible capacity and reducing the sensible heat of the roof-
top unit.
As the refrigerant leaves the evaporator, the refrigerant
passes a subcooler control low-pressure switch (S-LPS1 for
circuit 1 or S-LPS2 for circuit 2) in the suction line. This low-
pressure switch will deactivate the MoistureMiser package
when the suction pressure reaches 60 psig. The subcooler con-
trol low-pressure switch is an added safety device to protect
against evaporator coil freeze-up during low ambient opera-
tion. The subcooler control low-pressure switch will only
deactivate the 3-way liquid line solenoid valve in the Mois-
tureMiser circuit. The compressors will continue to run as long
as there is a call for cooling, regardless of the position of the
subcooler control low-pressure switch. The 3-way solenoid
valve and the MoistureMiser package will be reactivated only
when the call for cooling has been satisfied, the subcooler con-
trol low-pressure switch has closed above 80 psig, and a new
call for cooling exists. The crankcase heaters on the scroll com-
pressors provide additional protection for the compressors due
to the additional refrigerant charge in the subcooler.
When the OAT is below the MECH CLG LOCKOUT set
point, the compressors remain off.
23
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Fig. 30 — MoistureMiser Operation Diagram
When the humidistat is satisfied, the humidistat internal
CONDENSER COIL — Clean condenser coil annually and
as required by location and outdoor-air conditions. Inspect coil
monthly — clean as required.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season.
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.
switch opens, cutting power to and deenergizing the LLSVs.
The refrigerant is routed back through the evaporators and the
sub-cooler coils are removed from the refrigerant loops. When
the thermostat is satisfied, C1 and C2 are deenergized and the
compressors, IFM, and OFMs shut off. If the thermostat
fan selector switch is in the ON position, the IFM will run
continuously.
NOTE: The 50TJ028 unit requires industrial grade throwaway
filters capable of withstanding face velocities up to 625 fpm.
Ensure that replacement filters for the 50TJ028 units are rated
for 625 fpm.
SERVICE
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throwaway
filters in place of screens.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Turn off accessory
heater power switch if applicable. Electrical shock could
cause personal injury.
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. Conventional white oil
(Sontext 200LT) is used. White oil is compatible with 3GS oil,
and 3GS oil may be used if the addition of oil is required. See
compressor nameplate for original oil charge. A complete re-
charge should be four ounces less than the original oil charge.
When a compressor is exchanged in the field it is possible that
a major portion of the oil from the replaced compressor may
still be in the system. While this will not affect the reliability of
the replacement compressor, the extra oil will add rotor drag
and increase power usage. To remove this excess oil, an access
valve may be added to the lower portion of the suction line at
Cleaning — Inspect unit interior at beginning of each heat-
ing and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interior.
EVAPORATOR COIL — Clean as required with a commer-
cial coil cleaner.
NOTE: The 50TJ028 unit has a mist eliminator screen attached
to the evaporator coil to prevent condensate runoff at high wet-
bulb conditions. Check periodically and clean as necessary.
24
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the inlet of the compressor. The compressor should then be run
for 10 minutes, shut down, and the access valve opened until
no oil flows. This should be repeated twice to make sure the
proper oil level has been achieved.
FAN SHAFT BEARINGS — For size 016 units, bearings are
permanently lubricated. No field lubrication is required. For
size 020-028 units, the bearings are of the pillow block type
and have grease fittings. The bearing opposite the motor end
has an extended tube line so it can be lubricated from the motor
side. Lubricate the bearings twice annually.
6. Remove belt.
7. Rotate motor mount assembly back past original position
toward evaporator coil.
8. Remove motor mounting nuts D and E (both sides).
9. Lift motor up through top of unit.
10. Reverse above procedure to reinstall motor.
11. Check and adjust belt tension as necessary.
50TJ020-028 UNITS (See Fig. 33) — The 50TJ020-028
units use a fan motor mounting system that features a slide-out
motor mounting plate. To replace or service the motor, slide out
the bracket.
1. Remove the evaporator-fan access panel and the heating
control access panel.
2. Remove the center post (located between the evaporator
fan and heating control access panels) and all screws se-
curing it.
Typical lubricants are given below:
MANUFACTURER
LUBRICANT
Texaco
Mobil
Sunoco
Texaco
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
3. Loosen nuts on the two carriage bolts in the motor mount-
ing base.
4. Using jacking bolt under motor base, raise motor to top of
slide and remove belt. Secure motor in this position by
tightening the nuts on the carriage bolts.
CONDENSER AND EVAPORATOR-FAN MOTOR
BEARINGS — The condenser and evaporator-fan motors
have permanently-sealed bearings, so no field lubrication is
necessary.
5. Remove the belt drive.
6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
Evaporator Fan Performance Adjustment
(Fig. 31-33) — Fan motor pulleys are factory set for speed
shown in Table 1.
To change fan speeds:
8. Remove the 3 screws from the end of the motor support
channel that interfere with the motor slide path.
9. Slide out the motor and motor mounting plate.
1. Shut off unit power supply.
2. a. Size 016 Only: Loosen belt by loosening fan motor
mounting plate nuts.
10. Disconnect wiring connections and remove the 4 mount-
ing bolts.
11. Remove the motor.
b. Size 020-028 Only: Loosen nuts on the 2 carriage
bolts in the motor mounting base. Install jacking
bolt and plate under motor base (bolt and plate are
shipped in installer’s packet). See Fig. 33. Using
bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by tight-
ening the nuts on the carriage bolts.
12. To install the new motor, reverse Steps 1-11.
3. Loosen movable-pulley flange setscrew (see Fig. 31).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed. In-
creasing fan speed increases load on motor. Do not ex-
ceed maximum speed specified in Table 1.
See Table 7 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 26.
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.
Evaporator Fan Service and Replacement
50TJ016 UNITS (See Fig. 32)
NOTE: To remove belts only, follow Steps 1-6.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Loosen carriage nuts A and B holding motor mount as-
sembly to fan scroll side plates.
4. Loosen screw C.
5. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
Fig. 31 — Evaporator-Fan Pulley Alignment
and Adjustment
25
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4. Tighten setscrews and replace rubber hubcap to prevent
hub from rusting to motor shaft.
5. Fill hub recess with permagum if rubber hubcap is
missing.
NOTE: A 31/2-in. bolt and threaded plate are included in the
installer’s packet. They should be added to the motor support chan-
nel below the motor mounting plate to aid in raising the motor. The
plate part number is 50DP503842. The adjustment bolt is 3/8-16 x
13/4 in.-LG.
Fig. 32 — 50TJ016 Evaporator-Fan
Motor Section
Fig. 33 — 50TJ020-028 Evaporator-Fan
Motor Section
Belt Tension Adjustment — To adjust belt tension:
1. Loosen fan motor bolts.
2. Adjust belt tension:
a. Size 016 Units: Move motor mounting plate up or
down for proper belt tension (1/2 in. deflection with
one finger).
b. Size 020-028 Units: Turn motor jacking bolt to move
motor mounting plate up or down for proper belt ten-
sion (3/8 in. deflection at midspan with one finger [9
lb force]).
NOTE: Dimensions are in inches).
3. Tighten nuts.
Fig. 34 — Condenser-Fan Adjustment,
50TJ016,020
4. Adjust bolts and nut on mounting plate to secure motor in
fixed position.
Condenser-Fan Adjustment
50TJ016,020 UNITS (Fig. 34)
1. Shut off unit power supply.
2. Remove access panel(s) closest to the fan to be adjusted.
3. Loosen fan hub setscrews.
4. Adjust fan height on shaft using a straightedge placed
across the fan orifice.
5. Tighten setscrews and replace panel(s).
6. Turn on unit power.
50TJ024,028 UNITS (Fig. 35)
1. Shut off unit power supply.
2. Remove fan top-grille assembly and loosen fan hub
screws.
3. Adjust fan height on unit, using a straightedge placed
across the fan orifice.
NOTE: Dimensions are in inches.
Fig. 35 — Condenser-Fan Adjustment,
50TJ024,028
26
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sensor fault must be corrected to enable EconoMi$er to revert
to normal operation.
If the CONFIG button is pressed and held for more than
30 seconds and released, the EconoMi$er controller will enable
the enthalpy comparison strategy (with outdoor air enthalpy
and return air enthalpy sensors installed).
EconoMi$er Adjustment
LED INDICATION — The EconoMi$er controller features
an onboard diagnostic LED (light-emitting diode) that flashes
to indicate its status. See Table 15 for flash codes. The control-
ler also has terminal connections (REM LED) for remotely
mounting an LED, if desired. The flash code priorities are as
follows:
1. On/Off or continuous flash
2. Critical fault
3. Non-critical fault
Power Failure — Dampers have a spring return. In event
of power failure, dampers will return to fully closed position
until power is restored. Do not manually operate damper
motor.
If any sensors are opened, shorted, or removed, the
EconoMi$er determines whether the failure is critical or non-
critical and flashes the appropriate code. If a non-critical sensor
fault occurs (i.e., outdoor air humidity), the EconoMi$er auto-
matically reconfigures its control strategy to a more appropriate
mode. If a critical sensor fault occurs (i.e., supply air sensor),
the EconoMi$er reverts to a safe mode of operation until the
sensor problem is resolved.
MANUAL CONFIGURATION PUSHBUTTON — The
EconoMi$er controller also features an onboard button (CON-
FIG) to help troubleshoot the system. See Fig. 16. The button
can perform 3 different functions.
Pressing the CONFIG button for more than three seconds,
but less than ten seconds and then releasing will start the auto-
matic test procedure. The damper will modulate fully open,
wait, and modulate closed. This process takes three minutes to
complete. Use this feature to determine if the actuator can be
commanded.
If the CONFIG button is pressed and held for ten seconds
and less than 30 seconds then released, the EconoMi$er con-
troller reconfigures its mode of operation based on the sensors
that are connected and functioning normally, and cancels the
automatic test procedure.
Refrigerant Charge — Amount of refrigerant charge is
listed on unit nameplate and in Table 1. 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.
NOTE: Do not use recycled refrigerant as it may contain con-
taminants.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refriger-
ant (refer to Table 1).
LOW CHARGE COOLING — Using cooling charging chart
(see Fig. 36), add or remove refrigerant until conditions of the
chart are met. Note that charging chart is different from those
normally used. An accurate pressure gage and temperature-
sensing device is required. Charging is accomplished by ensur-
ing 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 ambient
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. NOTE: Indoor-air
CFM must be within normal operating range of unit. All out-
door fans must be operating.
If the EconoMi$er controller recognized a non-critical
sensor fault, and flashed a code (i.e., FLASH 6, outdoor air
humidity sensor fault) the FLASH CODE will be cleared, and
normal operation begins. Ensure faulty sensor is removed
before clearing faults.
If the EconoMi$er controller recognizes a critical sensor
fault, and flashes a code (i.e., FLASH 4, discharge air thermo-
stat fault) the FLASH code will not be cleared, and the
EconoMi$er will remain in the safe operation mode. The
The TXV (thermostatic expansion valve) is set to maintain
between 15 and 20 degrees of superheat at the compressors.
The valves are factory set and should not require re-adjustment.
Table 15 — EconoMi$er Control Module Flash Code Identification
FLASH CODE
Constant On
Constant Off
CAUSE
Normal operation
No power
ACTION TAKEN BY ECONOMI$ER
Normal operation.
No operation.
Continuous
Flash
CONFIG button pushed and held
between 3 and 9 seconds
Outdoor air damper is stroked fully open, then closed
(automatic test procedure takes 3 minutes to complete).
Flash One
Flash Two
Flash Three
Control board fault
Thermostat fault (i.e., Y2 without Y1)
Actuator fault
System shutdown.
System shutdown until corrected.
Revert to mechanical cooling only.
Continue operation with damper at minimum position.
Revert to mechanical cooling only.
Flash Four
Discharge air thermistor fault
Continue operation with damper at minimum position.
Disable mechanical cooling lockout.
Continue operation with dry bulb or dry bulb differential switchover.
Flash Five
Flash Six
Outdoor air temperature sensor fault
Outdoor air humidity sensor fault
Continue operation with single enthalpy EconoMi$er
switchover or dry bulb EconoMi$er switchover (without
humidity sensor).
Flash Seven
Return air temperature sensor fault
Continue operation with single enthalpy, differential dry
bulb, or dry bulb EconoMi$er switchover.
Flash Eight
Return air humidity sensor fault
Flash Nine
Flash Ten
Carbon Dioxide (CO2) sensor fault
Continue operation without ventilation control.
Onboard adjustment potentiometer fault
Continue operation with default potentiometer settings.
27
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Compressor Lockout — If any of the safeties (high-pressure,
low-pressure, freeze protection thermostat, compressor internal
thermostat) trip, or if there is loss of power to the compressors,
the CLO (compressor lockout) will lock the compressors off.
To reset, manually move the thermostat setting.
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.
BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING
140
120
ADD CHARGE IF ABOVE CURVE
100
80
CONDENSER-FAN MOTOR PROTECTION — Each
condenser-fan motor is internally protected against
overtemperature.
HIGH- AND LOW-PRESSURE SWITCHES — If either
switch trips, or if the compressor overtemperature switch acti-
vates, that refrigerant circuit will be automatically locked out
by the CLO. To reset, manually move the thermostat setting.
REDUCE CHARGE IF BELOW CURVE
60
FREEZE PROTECTION THERMOSTAT (FPT) — An FPT
is located on the top and bottom of the evaporator coil. It de-
tects frost build-up and turns off the compressor, allowing the
coil to clear. Once the frost has melted, the compressor can be
reenergized.
40
50
100
150
200
250
300
350
400
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
Fig. 36 — Cooling Charging Chart
Relief Devices — All units have relief devices to protect
against damage from excessive pressures (e.g., fire). These de-
vices protect the high and low side.
MOISTUREMISER SYSTEM CHARGING — The system
charge for units with the MoistureMiser option is greater than
that of the standard unit alone. The charge for units with this
option is indicated on the unit nameplate drawing. To charge
systems using the MoistureMiser Dehumidification package,
fully evacuate, recover, and re-charge the system to the name-
plate specified charge level. To check or adjust refrigerant
charge on systems using the MoistureMiser Dehumidification
package, charge per the standard subcooling charts. The sub-
cooler MUST be deenergized to use the charging charts. The
charts reference a liquid pressure (psig) and temperature at a
point between the condenser coil and the subcooler coil. A tap
is provided on the unit to measure liquid pressure entering the
subcooler (leaving the condenser).
Control Circuit, 24-V — This control circuit is protect-
ed against overcurrent by a 3.2-amp circuit breaker. Breaker
can be reset. If it trips, determine cause of trouble before
resetting.
Replacement Parts — A complete list of replacement
parts may be obtained from any Carrier distributor upon
request.
EconoMi$er LEDs — The EconoMi$er control module
has an LED for diagnostic purposes. The flash code identifica-
tion is shown in Table 15.
Filter Drier — Replace whenever refrigerant system is ex-
Optional Hinged Access Doors — When the optional
service package is ordered or the if the hinged access doors
option is ordered, the unit will be provided with external and
internal hinged access doors to facilitate service.
posed to atmosphere.
Protective Devices
COMPRESSOR PROTECTION
Four external hinged access doors are provided. All external
Overcurrent — Each compressor has internal line break motor
protection, except the circuit no. 1 on the 50TJ028 unit. Com-
pressor no. 1 on the 50TJ028 unit uses an electronic module lo-
cated with the compressor junction box, to provide motor pro-
tection. This electronic module monitors winding and dis-
charge temperatures. If these temperatures reach the trip
values, the module interrupts the control line and causes the
compressor to switch off.
1
doors are provided with 2 large /4 turn latches with folding
bail-type handles. (Compressor access doors have one latch.) A
single door is provided for filter and drive access. One door is
provided for control box access. The control box access door is
interlocked with the non-fused disconnect which must be in the
OFF position to open the door. Two doors are provided for ac-
cess to the compressor compartment.
Two internal access doors are provided inside the filter/
drive access door. The filter access door (on the left) is secured
by 2 small 1/4 turn latches with folding bail-type handles. This
door must be opened prior to opening the drive access door.
The drive access door is shipped with 2 sheet metal screws
holding the door closed. Upon initial opening of the door, these
screws may be removed and discarded. The door is then held
shut by the filter access door, which closes over it.
Crankcase Heater — Only the 50TJ028 unit and units with
the optional MoistureMiser Dehumidification system are
equipped with a 70-watt crankcase heater to prevent absorption
of liquid refrigerant by oil in the crankcase when the compres-
sor is idle. The crankcase heater is energized whenever there is
a main power to the unit and the compressor is not energized.
IMPORTANT: After prolonged shutdown or servicing,
energize the crankcase heaters for 24 hours before start-
ing the compressors.
28
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ELECTRIC HEAT
208/240 v Amps 200/230 v kW
A
B
C
71.3/82.3
117/135
156/180
25.7/34.2
42.2/56.1
56.2/74.8
Fig. 37 — Typical Wiring Schematic (50TJ024, 208/230-3-60 Shown)
29
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Fig. 37 — Typical Wiring Schematic (50TJ024, 208/230-3-60 Shown) (cont)
Fig. 38 — Typical Component Arrangement (50TJ024 Shown)
30
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LEGEND AND NOTES FOR FIG. 37 AND 38
LEGEND
GND — Ground
TB
TC
TH
—
—
—
Ter minal Block
AHA
— Adjustable Heat Anticipator
HC — Heater Contactor
HPS — High-Pressure Switch
HTR — Heater
Thermostat Cooling
Thermostat Heating
BRK W/AT— Breaks with Amp Turns
C
— Contactor, Compressor
— Circuit Breaker
TRAN — Transformer
CB
IFC — Indoor-Fan Contactor
IFCB — Indoor-Fan Circuit Breaker
IFM — Indoor-Fan Motor
IFR — Indoor-Fan Relay
CC
— Cooling Compensator
— Crankcase Heater
— Compressor Lockout
— Compressor Motor
— Control Relay
Terminal (Marked)
CH
CLO
COMP
CR
Terminal (Unmarked)
Ter minal Block
Splice
L
— Light
LOR — Lockout Relay
DAT
DM
— Discharge Air Thermistor
— Damper Motor
LPS — Low-Pressure Switch
LS
— Limit Switch
DU
— Dummy Terminal
— Enthalpy Control
— Equipment
NEC — National Electrical Code
OAT — Outdoor-Air Thermostat
OFC — Outdoor-Fan Contactor
OFM — Outdoor-Fan Motor
EC
Factory Wiring
EQUIP
FL
Field Control Wiring
Option/Accessory Wiring
— Fuse Link
FLA
FPT
FU
— Full Load Amps
— Freeze Protection Thermostat
— Fuse
OP — Overcurrent Protection
To indicate common potential
only; not to represent wiring.
PL
— Plug Assembly
PRI — Primary
NOTES:
1. Compressor and fan motor(s) thermally protected; 3-phase motors protected
against primary single-phasing conditions.
2. If any of the original wire furnished must be replaced, it must be replaced with
type 90 C wire or its equivalent.
3. TRAN1 is wired for 230 v (60 Hz) or 220 v (50 Hz) operation. If unit is 208 v, dis-
connect the black wires from the ORN TRAN wire and reconnect to the RED
TRAN wire, apply wirenuts to wires.
5. IFCB must trip amps is equal to or less than 140% FLA.
6. The CLO locks out the compressor to prevent short cycling on compressor over-
load and safety devices. Before replacing CLO, check these devices.
7. Jumpers are omitted when unit is equipped with EconoMi$er.
8. Number(s) indicates the line location of used contacts. A bracket over (2) num-
bers signifies a single-pole, double-throw contact. An underlined number sig-
nifies a normally closed contact. Plain (no line) number signifies a normally open
contact.
31
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TROUBLESHOOTING
Refer to Tables 16-18 for troubleshooting details.
Table 16 — Cooling Service Analysis
PROBLEM
CAUSE
REMEDY
Compressor and
condenser fan
will not start.
Power failure.
Fuse blown or circuit breaker tripped.
Defective thermostat, contactor, transformer, or control
relay.
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Insufficient line voltage.
Incorrect or faulty wiring.
Thermostat setting too high.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Compressor will not start Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace.
but condenser fan runs.
Compressor motor burned out, seized, or internal over- Determine cause. Replace compressor.
load open.
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.
Excessive head pressure. Dirty air filter.
Dirty condenser coil.
Clean coil.
Refrigerant overcharged.
Faulty TXV.
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.
Suction pressure too low. Dirty air filter.
Low refrigerant charge.
Recover excess refrigerant.
Replace filter.
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.
Metering device or low side restricted.
Faulty TXV.
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
32
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Table 17 — EconoMi$er Troubleshooting
PROBLEM
POTENTIAL CAUSE
REMEDY
Damper Does Not
Open
Indoor (Evaporator) Fan is
Off
Check to ensure that 24 vac is present at Terminal C1 (Common Power)
on the IFC (Indoor [Evaporator] Fan Contactor) or that 24 vac is present at
the IFO (Indoor [Evaporator] Fan On) terminal. Check whether 24 vac is
present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is
not present, check wiring (see unit label diagram).
Check proper thermostat connection to G on the connection board.
No Power to EconoMi$er
Controller
Check to ensure that 24 vac is present across Terminals 24 VAC and
24 V COM on the EconoMi$er control. If 24 vac is not present, check wiring
(see unit label diagram). If 24 vac is present, STATUS light should be on
constantly.
No Power to G Terminal
Controller Fault
If IFM is on, check to ensure 24 vac is present on G Terminal of the
EconoMi$er controller. If 24 vac is not present, check wiring (see unit
label diagram).
If STATUS light is flashing one flash, the EconoMi$er controller is
experiencing a fault condition. Cycle power to the controller. If condition
continues, replace the EconoMi$er controller.
Thermostat Fault
If STATUS light is flashing two flashes, the EconoMi$er controller senses that
the thermostat is wired incorrectly. Check wiring between the thermostat
and the connection board in the electrical panel. The fault condition is
caused by Y2 being energized before Y1.
Actuator Fault
Check the wiring between the EconoMi$er controller and the actuator.
Hold CONFIG button between 3 and 10 seconds to verify the
actuator’s operation. (This process takes 3 minutes to complete.)
EconoMi$er
Operation Limited to
Minimum Position
Minimum Position Set
Incorrectly
EconoMi$er Changeover
Set Point Set Too High or
Too Low
Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%)
to 100% to verify operation, and then set to correct setting.
Set at correct value. See Table 5.
Discharge Air
Thermistor Faulty
If STATUS light is flashing 4 flashes, Discharge Air Thermistor is
faulty. Check wiring or replace sensor.
Outdoor Air Temperature
Sensor Faulty
If STATUS light is flashing 5 flashes, Outdoor Air Temperature Sensor is
faulty. Check wiring or replace sensor.
Damper Position
Less than Minimum
Position Set Point
Supply Air Low Limit
Strategy Controlling
The supply-air temperature is less than 45 F, causing the minimum
position to be decreased. Refer to the Start-Up instructions. Verify correct
setting of MIN POS (%). If correct, EconoMi$er is operating correctly.
Damper Does Not
Return to Minimum
Position
CO2 Ventilation Strategy
Controlling
If a CO2 sensor is being used, and the damper position is greater than
minimum position, the ventilation control strategy is controlling. Refer to
The Start-Up instructions. EconoMi$er is operating correctly.
Damper Does Not
Close on Power Loss
Damper Travel is
Restricted
Check to ensure the damper is not blocked.
LEGEND
IFM
PL
—
—
Indoor Fan Motor
Plug
Table 18 — MoistureMiser Dehumidification Subcooler Service Analysis
PROBLEM
CAUSE
REMEDY
Subcooler will not energize
No power to subcooler
control transformer.
Check power source. Ensure all wire connections
are tight.
No power from subcooler
control transformer to liquid line three way valve.
1. Fuse open; check fuse. Ensure continuity of wiring.
2. Subcooler control low pressure switch open.
Cycle unit off and allow low-pressure switch
to reset. Replace switch if it will not close.
3. Transformer bad; check transformer.
Liquid line three-way valve
will not operate.
1. Solenoid coil defective; replace.
2. Solenoid valve stuck closed; replace.
Subcooler will not deenergize
Low system capacity
Liquid Line three-way valve
will not close.
Low refrigerant charge or
frosted coil.
Valve is stuck open; replace.
1. Check charge amount. See system charging
section.
2. Evaporator coil frosted; check and replace
subcooler control low pressure switch if necessary.
33
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SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase your knowledge of the equipment
discussed in this manual, including:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs are available, using popular video-based formats
and materials. All include video and/or slides, plus companion book.
Classroom Service Training which includes “hands-on” experience with the products in our labs can
mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course
descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-962-9212
[
] Packaged Service Training
[
] Classroom Service Training
Copyright 2001 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. 535-034 Printed in U.S.A. Form 50TJ-17SI Pg 34 2-01 Replaces: 50TJ-14SI
Book 1
Tab 1b
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START-UP CHECKLIST
MODEL NO.:
DATE:
SERIAL NO.:
TECHNICIAN:
PRE-START-UP:
VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT (016 UNITS) OR ADJUSTMENT
BOLT AND PLATE (020-028 UNITS)
VERIFY INSTALLATION OF ECONOMI$ER HOOD
VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
CHECK THAT FILTERS AND SCREENS ARE CLEAN AND 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 COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION
VERIFY THAT CRANKCASE HEATER HAS BEEN ENERGIZED FOR 24 HOURS (SIZE 028 AND UNITS WITH
OPTIONAL MOISTUREMISER DEHUMIDIFICATION SYSTEM ONLY)
START-UP:
ELECTRICAL
SUPPLY VOLTAGE
L1-L2
L2-L3
L2
L3-L1
L3
COMPRESSOR AMPS — COMPRESSOR NO. 1 L1
— COMPRESSOR NO. 2
L1
L2
L3
SUPPLY FAN AMPS
EXHAUST FAN AMPS
L1
ELECTRIC HEAT AMPS (IF SO EQUIPPED)
L2
L31
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
RETURN-AIR TEMPERATURE
COOLING SUPPLY AIR
F DB (Dry-Bulb)
F DB
F
F WB (Wet-Bulb)
ELECTRIC HEAT SUPPLY AIR (IF SO EQUIPPED)
F
PRESSURES
REFRIGERANT SUCTION
REFRIGERANT DISCHARGE CIRCUIT NO. 1
CIRCUIT NO. 1
PSIG
PSIG
CIRCUIT NO. 2
CIRCUIT NO. 2
PSIG
PSIG
VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 28.
GENERAL
ECONOMI$ER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES
Copyright 2001 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. 535-034
Printed in U.S.A.
Form 50TJ-17SI
Pg CL-1
2-01
Replaces: 50TJ-14SI
Tab
1b
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