Carrier 50TJ016-028 Dimensions and installation guide

Installation, Start-Up and
Service Instructions
CONTENTS Page
SAFETY CONSIDERATIONS ...................1
INSTALLATION .............................1-11
Step 1 — Provide Unit Support ...............1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit ..................1
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork ............8
Step 4 — Make Unit Duct Connections ........8
Step5—TrapCondensate Drain .............8
Step 6 — Make Electrical Connections ........8
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 — Make Outdoor-Air Inlet
Adjustments ..............................10
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL ECONOMIZER
Step 8 — Install Outdoor-Air Hood ...........11
START-UP .................................11-17
SERVICE ..................................18-22
START-UP CHECKLIST .....................CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified service personnel should
install, repair, 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 per-
sonnel. When working on air-conditioning equipment, ob-
serve precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire ex-
tinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb
or horizontal adapter in accordance with instructions shipped
with the curb or adapter. Accessory roof curb and horizontal
adapter and information required to field fabricate a roof curb
or horizontal adapter are shown in Fig. 1. Install insulation,
cant strips, roofing felt, and counter flashing as shown. Duct-
work can be secured to roof curb or horizontal adapter be-
fore unit is set in place.
IMPORTANT: The gasketing of the unit to the roof
curb or horizontal adapter is critical for a watertight
seal. Install gasket supplied with the roof curb or hori-
zontal adapter as shown in Fig. 1. Improperly applied
gasket can result in air leaks and poor unit
performance.
Curb or adapter should be level. This is necessary to per-
mit unit drain to function properly. Unit leveling tolerance is
± 5 mm per linear m (±
1
⁄ 16 in. per linear ft) in any direction.
Refer to Accessory Roof Curb or Horizontal Adapter Instal-
lation Instructions 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 100 mm
× 100 mm (4 in. × 4 in.) pads on each side.
Step2 — Rigand Place Unit— Inspect unit for trans-
portation damage. File any claim with transportation agency.
Keep unit upright, and do not drop. Use bumper boards for
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 reference; leveling tolerance is±5mm
per linear m (±
1
⁄ 16 in. per linear ft) in any direction. See
Fig. 2 for additional information. Unit weight is shown in
Tables 1A and 1B.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 2-4. Refer to rigging instructions on unit.
POSITIONING — Provide clearance around and above unit
for airflow, safety, and service access (Fig. 3 and 4).
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
ROOF MOUNT — Check building codes for weight distri-
bution requirements.
50TJ016-028
Single-Package Rooftop Units
50 Hz
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
Tab 1b Catalog No. 005-072 Printed in U.S.A. Form 50TJ-C8SI Pg 1 5-96 Replaces: 50TJ-C4SI

LEGEND
COMP SECT. — Compressor Section
NOTES:
1. Roof curb accessory is shipped unassembled.
2. Insulated panels, 13 mm (
1
⁄ 2 -in.) thick neoprene-coated, 0.9 kg
(2 lb) density.
3. Dimensions in ( ) are in millimeters.
4. Direction of airflow.
5. Roof curb: 4.3 mm (18 gage) steel.
6. Attach all ductwork to roof curb.
NOTE: To prevent the hazard of stagnant water build-up in the
drain pan of the indoor-air section, unit can only be pitched as
shown.
ACCESSORY
PACKAGE NO. CURB HEIGHT DESCRIPTION ‘‘A’’ ‘‘B’’ ‘‘C’’
50PQ900221 18-29(356) Standard Curb — 149High — — —
50PQ900141 28-09(610) Standard Curb for Units
Requiring High Installation ———
50PQ900151 28-09(610) Horizontal Curb 58-69(1676) 08-2
1
⁄ 2 9(64) 18-69(457)
50DP900211 18-119(584) Pre-Assembled, High-Static,
Horizontal Adapter 68-29(1880) 08-6
1
⁄ 4 9(159) 18-2
5
⁄ 8 9(371
Fig. 1 — Roof Curb Details
2

UNIT
50TJ
MAXIMUM
SHIPPING WEIGHT DIMENSIONS
AB
Lb Kg Ft-in. mm Ft-in. mm
016 2150 975 6-11
1
⁄ 2 2121 4-0 1219
024 2700 1225 6-11
1
⁄ 2 2121 3-7 1092
028 2750 1247 6-11
1
⁄ 2 2121 3-5 1041
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Tables 1A and 1B 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
postfrompackagingtoprotectcoilfromdamage.Usebumperboards
for spreader bars.
5. Weights do not include optional economizer. See Tables 1A and
1B for economizer weight.
6. Weights given are for aluminum evaporator and condenser coil
plate fins. Operating weights are listed in Tables 1A and 1B.
All panels must be in place when rigging.
Fig. 2 — Rigging Details
3

LEGEND
KO—Knockout
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. Ductwork to be attached to accessory roof curb only.
5. Minimum clearance:
a. Rear: 78-09(2134) for coil removal. This dimen-
sion can be reduced to 48-09(1219) if conditions
permit coil removal from the top.
b. Left side: 48-09(1219) for proper condenser coil
airflow.
c. Front: 48-09(1219) for control box access.
d. Right side: 48-09(1219) for proper operation of
damper and power exhaust if so equipped.
e. Top: 68-09(1829) to assure proper condenser fan
operation.
f. Local codes or jurisdiction may prevail.
6. With the exception of clearance for the condenser
coil and the damper/power exhaust as stated in note
no. 5, removable fence or barricade requires no
clearance.
7. Dimensions are from outside of corner post. Allow
08-
5
⁄ 16 9(8) on each side for top cover drip edge.
UNIT
50TJ
CORNER WEIGHT*
ABCD
Lb Kg Lb Kg Lb Kg Lb Kg
016 357 162 348 158 333 151 512 232
*Weights are for unit only (aluminum plate fins) and do
not include options or crating.
Fig. 3 — Base Unit Dimensions, 50TJ016
CONDENSATE
DRAIN PIPING
4

LEGEND
KO—Knockout
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Center of gravity.
3. Direction of airflow.
4. Ductwork to be attached to accessory roof curb
only.
5. Minimum clearance:
a. Rear: 78-09(2134) for coil removal. This di-
mension can be reduced to 48-09(1219) if
conditions permit coil removal from the top.
b. Left side: 48-09(1219) for proper condenser
coil airflow.
c. Front: 48-09(1219) for control box access.
d. Right side: 48-09(1219) for proper operation
ofdamperandpowerexhaust(ifso equipped).
e. Top: 68-09(1829) to assure proper con-
denser fan operation.
f. Local codes or jurisdiction may prevail.
6. With the exception of clearance for the con-
denser coil and the damper/power exhaust as
stated in note no. 5, a removable fence or bar-
ricade requires no clearance.
7. Dimensions are from outside of corner post. Al-
low 08-
5
⁄ 16 9(8) on each side for top cover drip
edge.
UNIT
50TJ
CORNER WEIGHT* DIMENSIONS
ABCD X Y
Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm
024 497 225 470 213 461 209 672 305 3-7 1092 3-2 965
028 513 233 532 241 542 246 563 255 3-5 1041 3-7 1092
*Weights are for unit only (aluminum plate fins) and do not include options or crating.
Fig. 4 — Base Unit Dimensions, 50TJ024,028
CONDENSATE
DRAIN PIPING
5

Table 1A — Physical Data, 50TJ016-028 (SI)
UNIT SIZE 016 024 028
NOMINAL CAPACITY (kW) 52.8 70.3 87.9
OPERATING WEIGHT (kg)
Unit
Al/Al* 703 952 975
Al/Cu* 771 1021 1043
Economizer 50 50 50
Roof Curb† 91 91 91
Electric Heat 29 29 29
COMPRESSOR Semi-Hermetic
Quantity 12 2
No. Cylinders 66 6
Oil (ml) 3401 3781 ea 3781 ea
REFRIGERANT TYPE R-22
Operating Charge (kg)
Circuit 1** 8.16 5.81 7.80
Circuit 2 — 5.81 7.80
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced or Copper Fins
Rows...Fins/m 2...669 3...590 4...590
Total Face Area (sq m) 2.06 2.06 2.06
CONDENSER FAN Propeller Type, 3 Blades
Nominal L/s 4465 6700 6700
Quantity...Diameter (mm) 3...559 2...762 2...762
Motor BkW...r/s 0.5...14.3 1...15.8 1...17.9
EVAPORATOR COIL Copper Tubes, Aluminum or Copper Plate Fins, Face Split Type
Refrigerant Control TXV Acutrol™ Feed Device
Rows...Fins/m 2...669 4...590 4...590
Total Face Area (sq m) 1.66 1.66 1.66
EVAPORATOR FAN Centrifugal Type
Quantity...Size (mm × mm) 2...254 × 254 2...305 × 305 2...305 × 305
Type Drive Belt Belt Belt
Nominal L/s 2825 3775 4719
Motor kW 2.24 5.59 7.46
Maximum Continuous BkW 2.57 7.08 8.80
Motor Frame Size 56H 213T 215T
Fan r/s Range 18.23-22.47 19.60-23.40 19.60-23.40
Motor Bearing Type Ball Ball Ball
Maximum Allowable r/s 25.8 25.8 25.8
Motor Pulley Pitch Diameter Min/Max (mm) 109/135 147/178 147/178
Nominal Motor Shaft Diameter (mm) 22 35 35
Fan Pulley Pitch Diameter (mm) 142 188 188
Nominal Fan Shaft Diameter (mm) 30 36.5 36.5
Belt, Quantity...Type...Length (mm) 1...B...1143 1...BX...1245 1...BX...1245
Pulley Center Line Distance (mm) 343-394 371-391 371-391
Speed Change per Full Turn of
Movable Pulley Flange (r/s) .85 .63 .63
Movable Pulley Maximum Full Turns
From Closed Posiiton 56 6
Factory Setting 3.5 3 3
Factory Speed Setting (r/s) 19.50 21.50 21.50
Fan Shaft Diameter at Pulley (mm) 30 36.5 36.5
HIGH-PRESSURE SWITCH (kPa)
Standard Compressor Internal Relief (Differential) —
Cutout 2951
Reset (Auto.) 2206
LOW-PRESSURE SWITCH (kPa)
Cutout 48
Reset (Auto.) 152
FREEZE PROTECTION THERMOSTAT (F)
Opens (C) −1
Closes (C) 7
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (mm) 2...508 × 635 × 25
1...508 × 508 × 25
RETURN-AIR FILTERS Throwaway††
Quantity...Size (mm) 3...406 × 508 × 50
2...406 × 635 × 50
MIST ELIMINATOR (CLEANABLE)
Quantity...Size (in.) — — 1...24.62 × 65.50 × .88
LEGEND
Al — Aluminum
Bhp — Brake Horsepower
Cu — Copper
TXV — Thermostatic Expansion Valve
*Evaporator coil fin material/condenser coil fin material.
†Weight of 356 mm roof curb.
**On 50TJ024,028 units, Circuit 1 consists of lower portion of both
the condenser and evaporator coils, and Circuit 2 consists of the
upper portion of both coils.
††The 50TJ028 units require 2-in. industrial-grade filters capable of
handling face velocities up to 3.2 m/sec (such as American Air
Filter no. 5700 or equivalent).
NOTE: These units have a low-pressure switch on the suction side
(standard).
6

Table 1B — Physical Data, 50TJ016-028 (English)
UNIT SIZE 016 024 028
NOMINAL CAPACITY (tons) 15 20 25
OPERATING WEIGHT (lb)
Unit
Al/Al* 1550 2100 2150
Al/Cu* 1700 2250 2300
Economizer 110 110 110
Roof Curb† 200 200 200
Electric Heat 64 64 64
COMPRESSOR Semi-Hermetic
Quantity 12 2
No. Cylinders 66 6
Oil (oz) 115 128 ea 128 ea
REFRIGERANT TYPE R-22
Operating Charge (lb-oz)
Circuit 1** 18-0 12-13 17-5
Circuit 2 — 12-13 17-5
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced or Copper Fins
Rows...Fins/in. 2...17 3...15 4...15
Total Face Area (sq ft) 22.2 22.2 22.2
CONDENSER FAN Propeller Type, 3 Blades
Nominal Cfm 9460 14,200 14,200
Quantity...Diameter (in.) 3...22 2...30 2...30
Motor BkW...Rpm 0.5...1050 1...950 1...1075
EVAPORATOR COIL Copper Tubes, Aluminum or Copper Plate Fins, Face Split Type
Refrigerant Control TXV Acutrol™ Feed Device
Rows...Fins/in. 2...17 4...15 4...15
Total Face Area (sq ft) 17.9 17.9 17.9
EVAPORATOR FAN Centrifugal Type
Quantity...Size (in.) 2...10 × 10 2...12 × 12 2...12 × 12
Type Drive Belt Belt Belt
Nominal Cfm 6000 8000 10,000
Motor Hp 37
1
⁄ 2 10
Maximum Continuous Bhp 3.45 9.50 11.80
Motor Frame Size 56H 213T 215T
Fan Rpm Range 1094-1348 1176-1403 1176-1403
Motor Bearing Type Ball Ball Ball
Maximum Allowable Rpm 1550 1550 1550
Motor Pulley Pitch Diameter Min/Max (in.) 4.3/5.3 5.8/7.0 5.8/7.0
Nominal Motor Shaft Diameter (in.)
7
⁄ 8 1
3
⁄ 8 1
3
⁄ 8
Fan Pulley Pitch Diameter (in.) 5.6 7.4 7.4
Nominal Fan Shaft Diameter (in.) 1
3
⁄ 16 1
7
⁄ 16 1
7
⁄ 16
Belt, Quantity...Type...Length (in.) 1...B...45 1...BX...49 1...BX...49
Pulley Center Line Distance (in.) 13.5-15.5 14.6-15.4 14.6-15.4
Speed Change per Full Turn of
Movable Pulley Flange (rpm) 51 38 38
Movable Pulley Maximum Full Turns
From Closed Posiiton 56 6
Factory Setting 3.5 3 3
Factory Speed Setting (rpm) 1170 1290 1290
Fan Shaft Diameter at Pulley (in.) 1
3
⁄ 16 1
7
⁄ 16 1
7
⁄ 16
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief (Differential) —
Cutout 426
Reset (Auto.) 320
LOW-PRESSURE SWITCH (psig)
Cutout 7
Reset (Auto.) 22
FREEZE PROTECTION THERMOSTAT (F)
Opens 30±5
Closes 45±5
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (in.) 2...20 × 25 × 1
1...20 × 20 × 1
RETURN-AIR FILTERS Throwaway††
Quantity...Size (in.) 4...20 × 20 × 2
4...16 × 20 × 2
MIST ELIMINATOR (CLEANABLE)
Quantity...Size (in.) — — 1...24.62 × 65.50 × .88
LEGEND
Al — Aluminum
Bhp — Brake Horsepower
Cu — Copper
TXV — Thermostatic Expansion Valve
*Evaporator coil fin material/condenser coil fin material.
†Weight of 14-in. roof curb.
**On 50TJ024,028 units, Circuit 1 consists of lower portion of both
the condenser and evaporator coils, and Circuit 2 consists of the
upper portion of both coils.
††The 50TJ028 units require 2-in. industrial-grade filters capable of
handling face velocities up to 625 ft/min (such as American Air
Filter no. 5700 or equivalent).
NOTE: These units have a low-pressure switch on the suction side
(standard).
7

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
insulated and covered with a vapor barrier.
The 50TJ units with electric heat require a 25 mm (1-in.)
clearance for the first 610 mm (24 in.) of ductwork.
Outlet grilles must not lie directly below unit discharge.
Step 4 — Make Unit Duct Connections — Unit
is shipped for through-the-bottom duct connections. Duct-
work openings are shown in Fig. 5. Field-fabricated concen-
tric ductwork may be connected as shown in Fig. 6 and 7.
See Fig. 8 for horizontal supply/return connections. Attach
all ductwork to roof curb and roof curb basepans. Refer to
installation instructions shipped with accessory roof curb for
more information.
Step5—TrapCondensate Drain — See Fig. 3, 4,
and 9 for drain location. Plug is provided in drain hole and
must be removed when unit is operating. One
3
⁄ 4 -in. FPT is
provided inside unit evaporator section for condensate drain
connection. A 216-mm × 19-mm (8
1
⁄ 2 -in. ×
3
⁄ 4 -in.) diameter
nipple and a 51-mm × 19-mm (2-in. ×
3
⁄ 4 -in.) diameter pipe
nipple are coupled to a standard 19-mm (
3
⁄ 4 -in.) diameter el-
bow to provide a straight path down through holes in unit
base rails (see Fig. 10). A trap at least 100 mm (4 in.) deep
must be used. If only one drain connection is trapped, other
connection must be plugged.
Step 6 — Make Electrical Connections
FIELD POWER SUPPLY — Unit is factory wired for volt-
age shown on nameplate. Units are provided with terminal
block.
When installing units, provide a disconnect of adequate
size per local ordinances and codes (see Table 2).
All field wiring must comply with local requirements.
Route power lines through control box end panel or unit
basepan (Fig. 3 and 4) to terminal connections as shown on
unit wiring diagram and Fig. 11.
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 5 — Air Distribution — Through-the-Bottom
(50TJ024,028 Shown)
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 6 — Concentric Duct Air Distribution
(50TJ024,028 Shown)
Shaded area indicates block-off panels.
NOTES:
1. DimensionA,A8and B, B8are obtained from field-supplied ceiling
diffuser.
2. Dimensions are in millimeters.
Fig. 7 — Concentric Duct Details
NOTE: For preassembled horizontal adapter part no. 50DP900211,
theaccessory kitincludes afactory-designed, regain,high-static, tran-
sition duct. For horizontal curb part no. 50PQ900151, a field-supplied
transition duct is required.
Fig. 8 — Horizontal Adapter and Roof Curb Details
8

Operating voltage to compressor must be within voltage
range indicated on unit nameplate. Voltages between phases
must be balanced within 2% and the current must be bal-
anced within 10%.
Use the following formula to determine the percent volt-
age imbalance.
= 100 x max voltage deviation from average voltage
average voltage
Example: Supply voltage is 400-3-50.
AB = 393 v
BC = 403 v
AC = 396 v
Average Voltage = 393 + 403 + 396
3
=1192
3
= 397
Determine maximum deviation from average voltage:
(AB) 397 − 393 = 4 v
(BC) 403 − 397 = 6 v
(AC) 397 − 396 = 1 v
Maximum deviation is 6 v.
Determine percentage of voltage imbalance:
% Voltage Imbalance = 100 x 6
397
= 1.5%
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
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 volt-
age 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
instructions included with the accessory. Locate thermostat
assembly on a solid wall in the conditioned space to sense
average temperature.
Route thermostat cable or equivalent single leads of
1.0 mm
2
(no. 18 AWG [American Wire Gage, U.S.A.]) col-
ored wire from subbase terminals through conduit in unit to
low-voltage connections as shown on unit label wiring dia-
gram and in Fig. 12.
NOTE: For wire runs up to 15 m (50 ft), use 1.0 mm
2
(no. 18 AWG) insulated wire (35 C minimum). For 15 to
23 m (50 to 75 ft), use 1.5 mm
2
(no. 16AWG) insulated wire
(35 C minimum). For over 23 m (75 ft), use 2.5 mm
2
(no. 14AWG) insulated wire (35 C minimum).All wire larger
than 1.0 mm
2
(no. 18 AWG) cannot be directly connected to
the thermostat and will require a junction box and splice at
the thermostat. See Table 3 for American/European wire
conversions.
Set heat anticipator settings as indicated in Table 4. Set-
tings may be changed slightly to provide a greater degree of
comfort for a particular installation.
Refer to accessory remote control instructions as
required.
3/4" FPT DRAIN
CONNECTION 35 (1-3/8") DRAIN HOLE
NOTE: Dimension is in millimeters.
Fig. 9 — Condensate Drain Details
Fig. 10 — Condensate Drain Piping Details
LEGEND
AWG — American Wire Gage
EQUIP — Equipment
GND — Ground
TB — Terminal Block
NOTE: The maximum wire size for TB1 is 70 mm
2
(2/0 AWG).
Fig. 11 — Field Power Wiring Connections
Fig. 12 — Field Control Thermostat Wiring
9

Table 2 — Electrical Data, 50TJ016-028
UNIT
50TJ NOMINAL
VOLTAGE
(3 Ph, 50 Hz)
VOLTAGE
RANGE COMPRESSOR OFM IFM ELECTRIC
HEAT* POWER SUPPLY
No. 1 No. 2
Min Max RLA LRA RLA LRA Quantity FLA
(ea) Hp FLA Nominal kW FLA MCA MOCP**
016 400 342 440 29.0 120 — — 3 0.8 3 5.0 — — 44 70
23 34 49 70
40 57 78 80
58† 83 89 90
024 400 342 440 19.9 114 19.9 114 2 3.0 7
1
⁄ 2 12.1 — — 63 80
23 34 63 80
40 57 86 90
58† 83 98 110
028 400 342 440 28.6 115 28.6 115 2 3.0 10 14.0 — — 84 110
23 34 84 110
40 57 89 110
58† 83 100 110
LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code, U.S.A.
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps
*Heater capacity (kW) is based on heater voltage of 400 v. If power
distribution voltage to unit varies from rated heater voltage, heater
kW will vary accordingly.
†Heaters are field installed only.
**Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements (U.S.A.) Standard) for mul-
timotor and combination load equipment (refer to NEC Articles
430 and 440), the overcurrent protective device for the unit shall
be fuse or HACR breaker.
2. MCA calculation for units with electric heaters over 50 kW =
(1.25 × IFM amps) + (1.00 × heater FLA).
Table 3 — American/European Wire Conversions
AMERICAN EUROPEAN
Industry
Standard Size American
Conversion
Size (mm
2
)
Industry
Standard
Size (mm
2
)
18 AWG 0.82 1.0
16 AWG 1.30 1.5
14 AWG 2.08 2.5
12 AWG 3.30 4.0
10 AWG 5.25 6.0
8AWG 6.36 10.0
6AWG 13.29 16.0
4AWG 21.14 25.0
3AWG 26.65 —
2AWG 33.61 35.0
1AWG 42.39 50.0
1/0 AWG 53.49 —
2/0 AWG 67.42 70.0
3/0 AWG 85.00 95.0
4/0 AWG 107.19 120.0
250 kcmil 126.64 150.0
300 kcmil 151.97 —
350 kcmil 177.90 185.0
400 kcmil 202.63 240.0
500 kcmil 253.29 300.0
600 kcmil 303.95 —
LEGEND
AWG — American Wire Gage, U.S.A. Standard
kcmil — Thousand Circular Mils
Table 4 — Heat Anticipator Settings
50TJ UNIT HEATER RATED
VOLTAGE kW STAGE 1 STAGE 2
All 400-3-50 23 .40 .40 40 .40 .66
58 .66 .66
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. 13).
OPTIONALECONOMIZER — The economizer motor con-
trol module is shown in Fig. 14. Set economizer motor con-
trol module to the ‘‘D’’ setting (Fig. 15). The economizer
motor control module is located on the economizer motor.
See Fig. 16.
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. Turn adjustment screw slowly until dampers assume de-
sired vent position. Do not manually operate economizer
motor since damage to motor will result.
Fig. 13 — 25% Outdoor-Air Damper Details
10

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 economizer.
NOTE: The hood top panel, upper and lower filter retainers,
hood drain pan, baffle (028 units), 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. 17).
1. Attach seal strip to upper filter retainer. See Fig. 18.
2. Assemble hood top panel and side panels, upper filter re-
tainer, and hood drain pan (Fig. 19).
3. Secure lower filter retainer and long piece of filter sup-
port bracket to unit. See Fig. 19. Leave screws loose on
028 units.
4. Slide baffle (028 units only) behind lower filter retainer
and tighten screws.
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.
9. Attach remaining shorter section of filter support bracket.
START-UP
Use the following information and Start-Up Checklist on
page CL-1 to check out unit PRIOR to start-up.
Unit Preparation — Check that unit has been installed
in accordance with these installation instructions and all ap-
plicable codes.
Compressor Mounting — Loosen compressor hold-
down nuts until sideways movement of the washer under each
holddown nut head can be obtained. Do not loosen
completely.
Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.
Fig.14 — Economizer DamperAssembly —End View
LED — Light-Emitting Diode
Fig. 15 — Economizer Motor Control Module
Fig. 16 — Economizer Motor Control Module
Location
Fig. 17 — Outdoor-Air Hood
Component Location
11

Refrigerant Service Ports — Each refrigerant sys-
tem has one service port located in the top of the compressor
motor casing. All units also have one service port on the liq-
uid line and one on either the discharge flange or the dis-
charge line. Be sure that the caps on the ports are tight.
Crankcase Heater(s) — Heater(s) is energized as long
as there is power to unit.
IMPORTANT: Unit power must be on for 24 hours
prior to start-up. Otherwise, damage to the compres-
sor may result.
Evaporator Fan — Fan belt and variable pulleys are
factory installed. Remove tape from the fan pulley. See
Table 5 for air quantity limits. See Tables 6-11 for fan per-
formance data. Be sure that fans rotate in the proper direc-
tion. See Tables 12A-13B for static pressure information for
factory-installed options and field-installed accessories. See
Tables 14Aand 14B for fan revolutions at various motor pul-
ley settings. See Fig. 20 for fan performance using horizon-
tal adapter. Refer to Table 15 for evaporator-fan motor per-
formance. To alter fan performance, see Evaporator-Fan
Performance Adjustment section on page 18.
Table 5 — Air Quantity Limits
UNIT
50TJ MINIMUM MAXIMUM
L/s Cfm L/s Cfm
016 2125 4500 3525 7,500
024 2800 6000 4800 10,000
028 3300 7000 5300 11,250
Condenser Fans and Motors — Fans and motors
are factory set. Refer to Condenser-Fan Adjustment section
on page 20 as required.
Return-Air Filters — Check that correct filters are in-
stalled in filter tracks. See Tables 1A and 1B. Do not operate
unit without return-air filters.
Outdoor-AirInletScreens— Outdoor-air inlet screens
must be in place before operating unit.
Accessory Economizer Adjustment — Remove
filter access panel. Check that the outdoor-air damper is closed
and return-air damper is open.
Economizer operation and adjustment is described in Base
Unit Operation section below and Economizer Adjustment
section on page 20.
Base Unit Operation
COOLING, UNITS WITHOUT ECONOMIZER — When
thermostat calls for cooling, terminals G and Y1 are ener-
gized. The indoor (evaporator) fan contactor (IFC), and com-
pressor contactor no. 1 (C1) are energized and evaporator-
fan motor, compressor no. 1 (50TJ024,028) or unloaded com-
pressor (50TJ016), and condenser fans start. The condenser-
fan motors run continuously while unit is cooling. If the ther-
mostat calls for a second stage of cooling by energizing Y2,
compressor contactor no. 2 (C2) is energized and compres-
sor no. 2 starts (50TJ024,028), or compressor no. 1 runs fully
loaded (50TJ016).
HEATING, UNITS WITHOUT ECONOMIZER (If
Accessory or Optional Heater is Installed) — Upon a call
for heating through terminal W1, IFC and heater contactor
no. 1 (HC1) are energized. On units equipped for 2 stages of
heat, when additional heat is needed, HC2 is energized through
W2.
COOLING, UNITS WITH ECONOMIZER — Upon a call
for cooling, when outdoor ambient temperature is above the
outdoor-air temperature control setting, the evaporator and
condenser fans and compressor energize. The economizer
damper moves to VENT position.
Upon a first-stage call for cooling, when outdoor ambient
temperature is below the temperature control setting, the evapo-
rator fan starts and economizer damper modulates to main-
tain mixed-air temperature. The compressor(s) remains off.
Upon a second-stage call for cooling, compressor no. 1
(50TJ024,028) or unloaded compressor (50TJ016) is ener-
gized and mechanical cooling is integrated with economizer
cooling. Compressor no. 2 is locked out. If the outdoor-air
temperature is below 10 C (50 F), a cooling lockout switch
prevents the compressor(s) from running.
When supply-air temperature drops below a fixed set point,
the economizer damper modulates to maintain the tempera-
ture at the fixed set point.
Afreeze protection thermostat (FPT) is located on the evapo-
rator coil. It detects frost build-up and turns off the com-
pressor, allowing the coil to clear. Once frost has melted, the
compressor can be reenergized.
HEATING, UNITS WITH ECONOMIZER (IfAccessory or
Optional Heater is Installed) — The outdoor-air damper stays
at VENTposition while the evaporator fan is operating. Upon
a call for heating through terminal W1, the indoor (evapo-
rator) fan contactor (IFC) and heater contactor no. 1 (HC1)
are energized. On units equipped for 2 stages of heat, when
additional heat is needed, HC2 is energized through W2.
Fig. 18 — Seal Strip Location
(Air Hood Cross-Sectional View)
Fig. 19 — Outdoor-Air Hood Details
12

Table 6 — Fan Performance Data (SI) — 50TJ016
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
50 100 150 200 250 275 300 350 400 450 500
R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW
2125 13.17 0.91 14.65 1.09 16.00 1.27 17.32 1.46 18.57 1.64 19.20 1.75 19.82 1.86 21.07 2.10 22.30 2.37 23.50 2.66 24.65 2.98
2265 13.83 1.08 15.25 1.27 16.55 1.46 17.80 1.65 19.00 1.86 19.58 1.96 20.17 2.06 21.33 2.29 22.52 2.56 23.65 2.84 24.80 3.15
2407 14.50 1.26 15.88 1.47 17.13 1.67 18.32 1.87 19.47 2.09 20.03 2.19 20.58 2.30 21.68 2.53 22.78 2.78 23.88 3.06 24.98 3.86
2475 14.84 1.37 16.20 1.58 17.43 1.79 18.58 2.00 19.71 2.22 20.27 2.33 20.81 2.43 21.88 2.66 22.94 2.91 24.02 3.18 25.09 3.73
2548 15.18 1.47 16.52 1.69 17.72 1.91 18.85 2.12 19.95 2.35 20.50 2.46 21.03 2.57 22.08 2.80 23.10 3.04 24.15 3.30 25.20 3.60
2690 15.87 1.71 17.17 1.94 18.32 2.17 19.42 2.39 20.47 2.62 20.98 2.74 21.50 2.86 22.52 3.09 23.50 3.34 24.47 3.60 — —
2825 16.57 1.96 17.82 2.20 18.93 2.45 20.00 2.69 21.00 2.92 21.50 3.05 22.00 3.17 22.98 3.42 23.93 3.67 — — — —
2973 17.25 2.25 18.48 2.50 19.57 2.75 20.58 3.01 21.57 3.26 22.05 3.38 22.52 3.51 23.47 3.77 — — — — — —
3115 17.97 2.56 19.13 2.82 20.22 3.09 21.18 3.36 22.15 3.62 22.62 3.75 — — — — — — — — — —
3175 18.32 2.73 19.47 3.00 20.53 3.27 21.50 3.54 — — — — — — — — — — — — — —
3256 18.67 2.90 19.80 3.18 20.85 3.46 21.82 3.73 — — — — — — — — — — — — — —
3398 19.38 3.27 20.48 3.56 — — — — — — — — — — — — — — — — — —
3525 19.95 3.60 — — — — — — — — — — — — — — — — — — — —
LEGEND
BkW — Fan Input kW × Motor Efficiency
kW — Kilowatt Input to Motor
NOTES:
1. Boldface indicates capability of standard unit.
2. Drive range is 18.23 to 22.47 r/s. All other r/s’s require a field-supplied
motor and/or drive.
3. Values include losses for filters, unit casing, and wet coils.
4. Extensive motor and electrical testing on these units ensures that the full
range of the motor can be utilized with confidence. Using your fan motors
up to the kW ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected. See Table 15 for additional
information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Carrier
representative to verify.
6. To convert kilowatts to bkW:
BkW = kW × Motor Efficiency
Motor Efficiency: 0.84 Maximum Continuous kW: 3.065
Do not adjust motor r/s such that motor maximum kW are exceeded at maxi-
mum operating L/s.
7. Interpolation is permissible. Do not extrapolate.
8. Static pressure losses (i.e., economizer, electric heater) must be added to
external static pressure before entering Fan Performance table. See
Table 12A for static pressure losses.
Table 7 — Fan Performance Data (SI) — 50TJ024
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
50 100 150 200 250 300 350 400 450
R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW
2800 11.6 1.41 13.1 1.70 14.6 2.00 15.9 2.31 17.2 2.64 18.4 2.98 19.5 3.35 20.7 3.73 21.8 4.13
3000 12.4 1.51 14.1 1.83 15.6 2.15 17.0 2.48 18.4 2.83 19.7 3.20 20.9 3.59 22.2 4.00 23.3 4.42
3200 13.0 1.83 14.5 2.16 16.0 2.50 17.3 2.84 18.6 3.20 19.8 3.58 21.0 3.97 22.2 4.38 23.3 4.81
3400 13.6 2.20 15.0 2.55 16.4 2.90 17.7 3.26 18.9 3.63 20.1 4.01 21.2 4.41 22.2 4.82 23.3 5.26
3600 14.2 2.62 15.6 2.98 16.9 3.35 18.1 3.72 19.2 4.10 20.3 4.50 21.4 4.90 22.4 5.32 23.3 5.76
3800 14.8 3.08 16.1 3.46 17.4 3.85 18.5 4.24 19.6 4.63 20.7 5.04 21.7 5.46 22.6 5.89 23.6 6.33
4000 15.5 3.61 16.8 4.01 18.0 4.41 19.1 4.82 20.1 5.23 21.1 5.66 22.1 6.09 23.0 6.52 23.9 6.98
4200 16.3 3.78 17.5 4.20 18.8 4.62 19.9 5.05 21.0 5.48 22.1 5.92 23.1 6.37 24.1 6.83 25.0 7.30
4400 16.9 4.38 18.1 4.81 19.3 5.25 20.4 5.70 21.5 6.14 22.5 6.60 23.5 7.06 24.4 7.53 25.3 8.01
4600 17.6 5.03 18.7 5.49 19.9 5.95 20.9 6.41 21.9 6.87 22.9 7.34 23.8 7.81 24.7 8.30 — —
4800 18.3 5.75 19.3 6.23 20.4 6.70 21.5 7.18 22.4 7.66 23.3 8.14 24.3 8.63 ————
LEGEND
BkW — Fan Input kW × Motor Efficiency
kW — Kilowatt Input to Motor
NOTES:
1. Boldface indicates capability of standard unit.
2. Factory-shipped drive range is 19.6 to 23.4 r/s. Other r/s’s require a field-
supplied motor and/or drive.
3. Values include losses for filters, unit casing, and wet coils.
4. Extensive motor and electrical testing on these units ensures that the full
range of the motor can be utilized with confidence. Using your fan motors
up to the kW ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected. See Table 15 for additional
information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Carrier
representative to verify.
6. To convert kilowatts to bkW:
BkW = kW × Motor Efficiency
Motor Efficiency: 0.84 Maximum Continuous kW: 8.640
Do not adjust motor r/s such that motor maximum kW are exceeded at maxi-
mum operating L/s.
7. Interpolation is permissible. Do not extrapolate.
8. Static pressure losses (i.e., economizer, electric heater) must be added to
external static pressure before entering Fan Performance table. See
Table 13A for static pressure losses.
13

Table 8 — Fan Performance Data (SI) — 50TJ028
AIRFLOW
(L/s)
EXTERNAL STATIC PRESSURE (Pa)
50 100 150 200 250 300 350 400 450
R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW R/s kW
3300 13.9 2.270 15.3 2.620 16.5 2.960 17.7 3.320 18.9 3.690 19.8 4.095 21.1 4.495 22.1 4.925 23.1 5.310
3400 14.2 2.480 15.6 2.828 16.8 3.181 18.0 3.543 19.2 3.917 20.2 4.304 21.3 4.705 22.3 5.120 23.3 5.552
3500 14.6 2.685 15.9 3.042 17.1 3.404 18.3 3.774 19.5 4.155 20.5 4.548 21.5 4.954 22.5 5.375 23.5 5.811
3600 14.9 2.890 16.2 3.255 17.4 3.626 18.6 4.005 19.7 4.393 20.7 4.791 21.7 5.203 22.7 5.629 23.7 6.069
3800 15.6 3.344 16.9 3.727 18.0 4.115 19.2 4.510 20.2 4.914 21.2 5.326 22.2 5.750 23.1 6.186 24.1 6.636
4000 16.3 3.844 17.5 4.245 18.7 4.651 19.7 5.062 20.8 5.481 21.7 5.909 22.7 6.345 23.6 6.793 24.5 7.253
4100 16.7 4.111 17.9 4.523 19.0 4.937 20.0 5.357 21.0 5.783 22.0 6.218 22.9 6.661 23.8 7.116 24.7 7.581
4200 17.0 4.392 18.2 4.812 19.3 5.235 20.3 5.663 21.3 6.098 22.3 6.540 23.2 6.991 24.1 7.452 25.0 7.922
4400 17.7 4.990 18.9 5.429 19.9 5.871 20.9 6.315 21.9 6.767 22.8 7.224 23.7 7.690 24.6 8.164 — —
4600 18.4 5.642 19.5 6.100 20.6 6.558 21.6 7.021 22.5 7.488 23.3 7.961 24.3 8.441 25.1 8.930 — —
4700 18.8 5.988 19.9 6.455 20.9 6.923 21.9 7.393 22.8 7.870 23.7 8.352 24.5 8.839 25.4 9.333 — —
4800 19.2 6.348 20.2 6.825 21.2 7.301 22.2 7.781 23.1 8.265 24.0 8.754 24.8 9.250 — — — —
5000 19.9 7.111 20.9 7.607 21.9 8.101 22.8 8.598 23.7 9.099 24.6 9.606 25.4 10.116 — — — —
5200 20.6 7.934 21.6 8.449 22.6 8.961 23.5 9.476 24.3 9.993 25.2 10.515 — — — — — —
5300 21.0 8.410 22.0 8.930 22.9 9.450 23.8 9.970 24.7 10.499 ————————
LEGEND
BkW — Fan Input kW × Motor Efficiency
kW — Kilowatt Input to Motor
NOTES:
1. Boldface indicates capability of standard unit.
2. Factory-shipped drive range is 19.6 to 23.4 r/s. Other r/s’s require a field-
supplied motor and/or drive.
3. Values include losses for filters, unit casing, and wet coils.
4. Extensive motor and electrical testing on these units ensures that the full
range of the motor can be utilized with confidence. Using your fan motors
up to the kW ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected. See Table 15 for additional
information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Carrier
representative to verify.
6. To convert kilowatts to bkW:
BkW = kW × Motor Efficiency
Motor Efficiency: 0.87 Maximum Continuous kW: 11.00
Do not adjust motor r/s such that motor maximum kW are exceeded at maxi-
mum operating L/s.
7. Interpolation is permissible. Do not extrapolate.
8. Static pressure losses (i.e., economizer, electric heater) must be added to
external static pressure before entering Fan Performance table. See
Table 13A for static pressure losses.
Table 9 — Fan Performance Data (English) — 50TJ016
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0 1.1 1.2 1.4
Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts
4500 790 906 879 1092 960 1270 1039 1456 1114 1643 1152 1751 1189 1856 1264 2096
4800 830 1075 915 1270 993 1456 1068 1652 1140 1856 1175 1958 1210 2060 1280 2291
5100 870 1261 953 1465 1028 1670 1099 1874 1168 2087 1202 2194 1235 2300 1301 2531
5250 891 1368 972 1576 1046 1790 1115 1999 1183 2216 1216 2325 1249 2434 1313 2531
5400 911 1474 991 1687 1063 1909 1131 2123 1197 2345 1230 2456 1262 2567 1325 2798
5700 952 1705 1030 1936 1099 2167 1165 2389 1228 2620 1259 2740 1290 2860 1351 3091
6000 994 1963 1069 2202 1136 2451 1200 2691 1260 2922 1290 3047 1320 3171 1379 3419
6300 1035 2247 1109 2504 1174 2753 1235 3011 1294 3259 1323 3384 1351 3508 1408 3766
6600 1078 2558 1148 2824 1213 3091 1271 3357 1329 3615 1357 3748 ————
6750 1099 2727 1168 3002 1232 3273 1290 3544 ————————
6900 1120 2895 1188 3179 1251 3455 1309 3730 ————————
7200 1163 3268 1229 3561 ————————————
7500 1205 3668 ——————————————
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
1.6 1.8 2.0
Rpm Watts Rpm Watts Rpm Watts
4500 1338 2371 1410 2664 1479 2984
4800 1351 2558 1420 2842 1488 3153
5100 1367 2780 1433 3055 1499 3857
5250 1377 2909 1441 3108 1506 3727
5400 1386 3037 1449 3304 1512 3597
5700 1410 3339 1468 3597 — —
6000 1436 3668 — — — —
6300 ————— —
6600 ————— —
6750 ————— —
6900 ————— —
7200 ————— —
7500 ————— —
LEGEND
Bhp — Brake Horsepower Input to Fan
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates capability of standard unit.
2. Factory-shipped drive range is 1094 to 1348 rpm. Other rpms require a field-
supplied motor and/or drive.
3. Static pressure losses (i.e., economizer, electric heater) must be added to ex-
ternal static pressure before entering Fan Performance table. See Table 12B for
static pressure losses.
4. Maximum continuous bhp is 3.45.
To convert Watts to Bhp, use the following equation:
Watts × Motor Efficiency
Bhp = 746
Motor Efficiency: .84 Maximum Continuous Watts: 3065
Do not adjust motor rpm such that motor maximum watts are exceeded at maxi-
mum operating cfm.
5. Interpolation is permissible. Do not extrapolate.
6. Fan Performance is based on wet coils, clean filters, and casing losses.
7. Extensive motor and drive testing on these units ensures that the full horse-
power range of the motor can be utilized with confidence. Using your fan motors
up to the wattage rating shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected. See Table 15 for additional
information.
14

Table 10 — Fan Performance Data (English) — 50TJ024
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts
6,000 702 1428 796 1723 884 2025 965 2339 1041 2669 1115 3018 1186 3385 1255 3771 1322 4175 1389 4579
6,500 747 1757 835 2073 919 2394 997 2725 1070 3069 1140 3429 1208 3805 1274 4198 1338 4609 1402 5020
7,000 792 2138 877 2476 957 2816 1031 3165 1102 3525 1169 3898 1233 4285 1296 4687 1358 5106 1420 5525
7,500 838 2571 918 2929 996 3290 1067 3658 1135 4035 1199 4422 1262 4822 1322 5235 1381 5662 1440 6089
8,000 885 3060 962 3440 1036 3822 1105 4209 1170 4604 1232 5008 1292 5422 1350 5847 1407 6286 1464 6725
8,500 932 3610 1005 4011 1077 4414 1143 4821 1206 5234 1266 5655 1324 6085 1380 6524 1435 6975 1490 7426
9,000 980 4223 1050 4647 1119 5071 1183 5498 1244 5930 1302 6369 1359 6816 1413 7270 1466 7735 1519 8200
9,500 1028 4904 1096 5350 1162 5796 1224 6243 1283 6695 1340 7152 1394 7616 1447 8088 1508 8428 — —
10,000 1077 5655 1141 6123 1205 6591 1266 7059 1323 7531 1378 8007 1431 8489 ——————
LEGEND
Bhp — Brake Horsepower Input to Fan
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates capability of standard unit.
2. Factory-shipped motor drive range is 1176 to 1403 rpm. Other rpms require
a field-supplied motor and/or drive.
3. Maximum continuous bhp is 9.5.
To convert watts to bhp:
Watts × Motor Efficiency
Bhp = 746
Motor Efficiency: 0.84 Maximum Continuous Watts: 8640
Do not adjust motor rpm such that motor maximum bhp and/or watts is ex-
ceeded at the maximum operating cfm.
4. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table. See Table 13B for static
pressure losses.
5. Interpolation is permissible. Do not extrapolate.
6. Fan Performance is based on wet coils, clean filters, and casing losses.
7. Extensive motor and drive testing on these units ensures that the full horse-
power range of the motor can be utilized with confidence. Using your fan
motors up to the watts rating shown will not result in nuisance tripping or
premature motor failure. Unit warranty will not be affected. See Table 15 for
more information.
Table 11 — Fan Performance Data (English) — 50TJ028
AIRFLOW
(Cfm)
EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts Rpm Watts
7,000 834 2270 918 2620 990 2960 1062 3320 1134 3,690 1188 4,095 1266 4495 1326 4925 1386 5310
7,500 881 2761 961 3119 1035 3483 1104 3855 1170 4,237 1233 4,631 1294 5038 1353 5458 1411 5893
8,000 930 3284 1007 3664 1077 4049 1144 4440 1207 4,840 1268 5,249 1327 5670 1384 6102 1440 6549
8,500 980 3873 1053 4274 1121 4679 1185 5090 1246 5,508 1305 5,934 1362 6371 1416 6816 1470 7215
9,000 1030 4528 1100 4951 1166 5377 1228 5808 1286 6,244 1343 6,689 1398 7141 1451 7602 1503 8074
9,500 1081 5254 1148 5700 1211 6146 1271 6597 1328 7,053 1383 7,515 1436 7985 1487 8462 — —
10,000 1132 6055 1197 6523 1257 6991 1315 7462 1370 7,937 1423 8,418 1475 8905 1525 9400 — —
10,500 1183 6935 1245 7425 1304 7913 1360 8404 1413 8,899 1465 9,400 1515 9907 ————
11,000 1235 7896 1295 8408 1351 8918 1405 9430 1457 9,944 1507 10,465 ——————
11,250 1261 8408 1320 8932 1375 9452 1428 9974 1479 10,499 — — ——————
LEGEND
Bhp — Brake Horsepower Input to Fan
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates capability of factory-supplied pulley.
2. Factory-shipped motor drive range is 1176 to 1403 rpm. Other rpms require
a field-supplied motor and/or drive.
3. Maximum continuous bhp is 11.80.
To convert watts to bhp:
Watts × Motor Efficiency
Bhp = 746
Motor Efficiency: 0.87 Maximum Continuous Watts: 11,000
Do not adjust motor rpm such that motor maximum bhp and/or watts is ex-
ceeded at the maximum operating cfm.
4. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table. See Table 13B for static
pressure losses.
5. Interpolation is permissible. Do not extrapolate.
6. Fan Performance is based on wet coils, clean filters, and casing losses.
7. Extensive motor and drive testing on these units ensures that the full horse-
power and watts range of the motor can be utilized with confidence. Using
your fan motors up to the watts rating shown will not result in nuisance trip-
ping or premature motor failure. Unit warranty will not be affected. See
Table 15 for more information.
15

Table 12A — Accessory/FIOP Static Pressure (Pa) — 50TJ016
COMPONENT L/s
2125 2360 2831 3400 3525
Economizer 10 12 17 22 25
Glycol Coil 55 65 87 109 114
Electric Heat (kW)
23
40
58
15
19
25
17
22
27
22
27
35
27
35
46
30
37
48
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 determine blower
rpm and watts.
2. Heaters are rated at 400 v.
Table 12B — Accessory/FIOP Static Pressure (in. wg) — 50TJ016
COMPONENT CFM
4500 5000 6000 7200 7500
Economizer 0.04 0.05 0.07 0.09 0.10
Glycol Coil 0.22 0.26 0.35 0.44 0.46
Electric Heat (kW)
23
40
58
0.06
0.08
0.10
0.07
0.09
0.11
0.09
0.11
0.14
0.11
0.14
0.18
0.12
0.15
0.19
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 determine blower
rpm and watts.
2. Heaters are rated at 400 v.
Table 13A — Accessory/FIOP Static Pressure (Pa) — 50TJ024,028
COMPONENT L/s
2800 3400 4247 4719 5300
Economizer 17 22 27 30 35
Glycol Coil 86 109 144 164 191
Electric Heat (kW)
23
40
58
22
28
36
27
35
46
37
45
57
43
53
65
50
61
75
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 determine blower
rpm and watts.
2. Heaters are rated at 400 v.
Table 13B — Accessory/FIOP Static Pressure (in. wg) — 50TJ024,028
COMPONENT CFM
6000 7200 9000 10,000 11,250
Economizer 0.07 0.09 0.11 0.12 0.14
Glycol Coil 0.35 0.44 0.58 0.66 0.77
Electric Heat (kW)
23
40
58
0.09
0.11
0.14
0.11
0.14
0.18
0.15
0.18
0.23
0.17
0.21
0.26
0.20
0.25
0.30
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 determine blower
rpm and watts.
2. Heaters are rated at 400 v.
16

Table 14A — Fan R/s at Motor Pulley Settings (SI)
UNIT
50TJ MOTOR PULLEY TURNS OPEN
0
1
⁄ 2 11
1
⁄ 2 22
1
⁄ 2 33
1
⁄ 2 44
1
⁄ 2 55
1
⁄ 2 6
016 22.47 22.05 21.62 21.20 20.77 20.35 19.93 19.50 19.08 18.65 18.23 — —
024,028 23.40 23.07 22.76 22.44 22.12 21.81 21.50 21.18 20.86 20.55 20.23 19.92 19.60
Table 14B — Fan Rpm at Motor Pulley Settings (English)
UNIT
50TJ MOTOR PULLEY TURNS OPEN
0
1
⁄ 2 11
1
⁄ 2 22
1
⁄ 2 33
1
⁄ 2 44
1
⁄ 2 55
1
⁄ 2 6
016 1348 1323 1297 1272 1246 1221 1196 1170 1145 1119 1094 — —
024,028 1403 1384 1366 1347 1328 1309 1290 1271 1252 1233 1214 1195 1176
Table 15 — Evaporator-Fan Motor Performance
UNIT
50TJ UNIT
RATED
VOLTAGE
MAXIMUM
ACCEPTABLE
CONTINUOUS
BHP*
MAXIMUM
ACCEPTABLE
CONTINUOUS
BkW*
MAXIMUM
ACCEPTABLE
OPERATING
WATTS
MAXIMUM
AMP DRAW
016 400 3.45 2.57 3,065 4.8
024 400 9.50 7.08 8,640 13.0
028 400 11.80 8.80 11,000 14.6
LEGEND
Bhp — Brake Horsepower
BkW — Fan Input Watts × Motor Efficiency
*Extensive motor and electrical testing on these units ensures that
the full horsepower and kilowatt ranges of the motors can be utilized
with confidence. Using your fan motors up to the horsepower or kilo-
watt ratings shown in this table will not result in nuisance tripping or
premature motor failure. Unit warranty will not be affected.
NOTE: The 50DP900211 high-static regain adapter accessory may
be used to provide horizontal supply/return. NOTE: The 50DP900211 horizontal supply and return adapter ac-
cessory improves 50TJ fan performance by increasing external static
pressure by amount shown above.
Fig. 20 — Horizontal Supply/Return Fan Performance With 50DP900211 High-Static Regain Adapter
17

SERVICE
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Turn off ac-
cessory heater power switch if applicable. Electrical shock
could cause personal injury.
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 at-
tached to the evaporator coil to prevent condensate runoff at
high wet-bulb conditions. Check periodically and clean as
necessary.
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
cooling season, or more often if operating conditions re-
quire. Refer to Tables 1A and 1B for type and size.
NOTE: The 50TJ028 unit requires industrial grade throw-
away filters capable of withstanding face velocities up to
3.2 m/s (625 fpm). Ensure that replacement filters for the
50TJ028 units are rated for 3.2 m/s (625 fpm).
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throw-
away filters in place of screens.
Lubrication
COMPRESSORS — Each compressor is charged with cor-
rect amount of oil at the factory.
The 50TJ016 compressor runs with a slightly low sight
glass oil level. Oil level with compressor off should be about
1
⁄ 4 of the sight glass as shown in Fig. 21. If oil is above this
level in the sight glass, do not remove any oil until the com-
pressor crankcase heater has been energized for at least
24 hours.
FAN SHAFT BEARINGS — For 016 units, bearings are per-
manently lubricated. No field lubrication is required. For 024
and 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.
Typical lubricants are given below:
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No. 1
Sunoco Prestige 42
Texaco Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
CONDENSERAND EVAPORATOR-FAN MOTOR BEAR-
INGS — The condenser and evaporator-fan motors have
permanently-sealed bearings, so no field lubrication is
necessary.
NOTE: Field-supplied motors with removeable lubrication
plug should be lubricated every 6 months.
Evaporator Fan Performance Adjustment
(Fig.22-24)— Fan motor pulleys are factory set for speed
shown in Tables 1A and 1B.
To change fan speeds:
1. Shut off unit power supply.
2a. 016 Only: Loosen belt by loosening fan motor mount-
ing plate nuts (see Fig. 23).
b. 024,028 Only: Loosen nuts on the 2 carriage bolts in the
motor mounting base. Install jacking bolt and plate un-
der motor base (bolt and plate are shipped in installer’s
packet). See Fig. 24. Using bolt and plate, raise motor
to top of slide and remove belt. Secure motor in this
position by tightening the nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 22).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maxi-
mum speed specified in Tables 1A and 1B. See Table 5
for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Tables 1Aand 1B for speed change
for each full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 20.
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 mount-
ing plate.
Evaporator Fan Service and Replacement
50TJ016 UNITS (See Fig. 23)
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.
6. Remove belt.
7. Rotate motor mount assembly back past original posi-
tion 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.
Fig. 21 — 50TJ016 Compressor Sight Glass
Oil Level
18

50TJ024,028 UNITS (See Fig. 24) — The 50TJ024,028 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 heat-
ing control access panel.
2. Remove the center post (located between the evaporator
fan and heating control access panels) and all screws
securing it.
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.
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.
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.
10. Disconnect wiring connections and remove the 4 mount-
ing bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-11.
Fig. 22 — Evaporator-Fan Pulley Alignment
and Adjustment
Fig. 23 — 50TJ016 Evaporator-Fan
Motor Section
NOTE:A3
1
⁄ 2 -in. bolt and threaded plate are included in the installer’s
packet. They can be added to the motor support channel below the
motor mounting plate to aid in raising the motor.
Fig. 24 — 50TJ024-028 Evaporator-Fan
Motor Section
19

Belt Tension Adjustment — To adjust belt tension:
1. Loosen fan motor bolts.
2. Adjust belt tension:
a. 016 Units: Move motor mounting plate up or down
for proper belt tension (13 mm [
1
⁄ 2 in.] deflection with
one finger).
b. 024,028 Units: Turn motor jacking bolt to move mo-
tor mounting plate up or down for proper belt tension
(10 mm [
3
⁄ 8 in.] deflection at midspan with one finger
[4 kg (9 lb) force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure motor
in fixed position.
Condenser-Fan Adjustment
50TJ016 UNITS (Fig. 25)
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. 26)
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.
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.
EconomizerAdjustment — See Tables 16 and 17 for
checkout and enthalpy simulation. Make certain the outdoor-
air damper is fully closed and the return-air damper is fully
open before completing the following steps.
1. Turn on power to the unit.
2. Turn the thermostat fan switch to the ON position. The
damper will go to the vent position.
3. Adjust the vent position with the minimum damper po-
sition adjustment on the module. See Fig. 15.
4. Set the system selector switch to COOL position and set
the cooling temperature selector to its lowest setting.
NOTE: The cooling mode may also be simulated by re-
moving the thermostat wires from terminals Y1 and Y2
and installing a jumper between terminals R and Y1.
Refer to unit label diagram for terminal locations.
5. Set the outdoor-air thermostat (OAT) located in the econo-
mizer section of the unit (see Fig. 14) to 23.9 C (75 F).
6. If the outdoor temperature is below 23.9 C (75 F), the
economizer will control the mixed air with the mixed-
air sensor. If the outdoor air is above 23.9 C (75 F), place
a jumper around the contacts of the OAT.
7. Jumper terminal T to terminal T1 on the module (see
Fig. 15). The economizer will go to the full open po-
sition. The outdoor-air damper will go to the full open
position, and the return-air damper will go to the full
closed position.
8. Adjust mechanical linkage, if necessary, for correct po-
sitioning. It may be necessary to remove the filters to
adjust the linkage.
9. Remove the jumper from around the contacts of the OAT
if installed in Step 6. Remove the jumper from termi-
nals T and T1 installed in Step 7.
10. If the cooling mode was simulated to operate the unit in
Step 4, remove the jumper and reconnect the thermostat
wires to terminals Y1 and Y2.
PowerFailure— 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 econo-
mizer motor.
Refrigerant Charge — Amount of refrigerant charge
is listed on unit nameplate and in Tables 1A and 1B. Refer
to Carrier GTAC II; Module 5; Charging, Recovery, Recy-
cling, and Reclamation section for charging methods and
procedures.
Unit panels must be in place when unit is operating dur-
ing charging procedure.
Table 16 — Economizer Checkout Procedures
TEST PROCEDURE RESULTS
A. Disconnect power at
TR and TR1.
Disconnect jumper
between P and
P1. See Fig. 15.
B. Jumper TR to 1.
C. Jumper T1 to T.
D. Disconnect outdoor-air
thermostat connections
from S
O
and +.
Factory-installed
800 ohm resistor
should remain connected
to S
R
and +.
E. Reconnect power to
terminals TR and TR1. 1. LED (light-emitting diode)
should be off.
2. Motor is in closed position.
TEST PROCEDURE RESULTS
A. Disconnect
factory-installed
resistor from
terminals S
R
and +. 1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.
Table 17 — High and Low Enthalpy Simulation
TEST PROCEDURE RESULTS
A. Reconnect factory-installed
800 ohm resistor
between terminals
S
R
and +.
B. Connect 1200 ohm
checkout resistor
between terminals
S
O
and +.
C. Turn set point potentiometer
to position A. Low outdoor-air test results:
1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.
D. Turn set point potentiometer
to position D.
E. Disconnect 1200 ohm
checkout resistor. High outdoor-air test results:
1. LED should be off.
2. Motor drives toward closed.
20