Installation, Start-Up and Service Instructions CONTENTS

Installation, Start-Up and Service Instructions CONTENTS
48TJ016-028
Single Package Rooftop Units
Electric Cooling/Gas Heating
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Step 1 — Provide Unit Support . . . . . . . . . . . . . . 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . 3
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork . . . . . . . . . . . 8
Step 4 — Make Unit Duct Connections . . . . . . . 8
Step 5 — Install Flue Hood and Wind Baffle . . 8
Step 6 — Trap Condensate Drain . . . . . . . . . . . . 8
Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . . 9
Step 8 — Make Electrical Connections . . . . . . . 9
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 9 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL ECONOMIZER
Step 10 — Install Outdoor-Air Hood . . . . . . . . . . 12
Step 11 — Install All Accessories . . . . . . . . . . . . 14
• MOTORMASTERt I CONTROL INSTALLATION
• MOTORMASTER III CONTROL INSTALLATION
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-21
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-31
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 32-34
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters.
All other operations should be performed by trained service
personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire extinguishers 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.
1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Refer to the User’s
Information Manual provided with this unit for more
details.
2. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone
in your building.
3. IMMEDIATELY call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire
department.
Disconnect gas piping from unit when pressure testing
at pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure
greater than 0.5 psig, it must be replaced before use. When
pressure testing field-supplied gas piping at pressures of
0.5 psig or less, a unit connected to such piping must be
isolated by closing the manual gas valve(s).
IMPORTANT: Units have high ambient operating limits. If limits are exceeded, the units will automatically
lock the compressor out of operation. Manual reset will
be required to restart the compressor.
INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble or install accessory roof curb or
horizontal adapter roof curb in accordance with instructions
shipped with this accessory. See Fig. 1 and 2. Install insulation, cant strips, roofing, and counter flashing as shown.
Ductwork can be installed to roof curb or horizontal adapter
before unit is set in place. Curb or adapter roof curb should
be level. This is necessary to permit unit drain to function
properly. Unit leveling tolerance is ± 1⁄16 in. per linear ft in
any direction. Refer to Accessory Roof Curb or Horizontal
Adapter Roof Curb Installation Instructions for additional
information as required. When accessory roof curb or horizontal adapter roof curb is used, unit may be installed on
class A, B, or C roof covering material.
Instructions continued on page 3.
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. 534-711
Printed in U.S.A.
Form 48TJ-14SI
Pg 1
10-98
Replaces: 48TJ-8SI
Tab 1a
PKG.
NO. REF.
50PQ900221
CURB
HEIGHT
18-29
(305)
50PQ900141
28-09
(610)
50PQ900151
28-09
(610)
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels: 1⁄29 thick neoprene coated 2 lb density.
3. Dimensions in ( ) are in millimeters.
DESCRIPTION
Standard Curb
149 High
Standard Curb
for Units
Requiring High
Installation
Side Supply
and Return Kit
for High Installation
4.
Direction of airflow.
5. Roof curb: 16 ga. (VA03-56) stl.
NOTE: To prevent the hazard of stagnant water build-up in the drain pan of the
indoor section, unit can only be pitched as shown.
UNIT LEVELING TOLERANCES*
Dimensions (degrees and inches)
UNIT
2
48TJ
A
DEG.
.28
*From edge of unit to horizontal.
Fig. 1 — Roof Curb Details
B
IN.
.45
DEG.
.28
IN.
.43
Step 2 — Rig and Place Unit — Inspect unit for transportation damage. File any claim with transportation agency.
Do not drop unit; keep upright. 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
reference; leveling tolerance is ± 1⁄16 in. per linear ft in any
direction. See Fig. 3 for additional information. Unit operating 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 — Maintain clearance, per Fig. 4 and 5, around
and above unit to provide minimum distance from combustible materials, proper airflow, and service access.
Do not install unit in an indoor location. Do not locate
unit air inlets near exhaust vents or other sources of contaminated air. For proper unit operation, adequate combustion and ventilation air must be provided in accordance with
Section 5.3 (Air for Combustion and Ventilation) of the
National Fuel Gas Code, ANSI Z223.1 (American National
Standards Institute).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft system flue assembly at least
4 ft from any opening through which combustion products
could enter the building, and at least 4 ft from any adjacent
building. When unit is located adjacent to public walkways,
flue assembly must be at least 7 ft above grade.
ROOF MOUNT — Check building codes for weight distribution requirements. Unit operating weight is shown in
Table 1.
Instructions continued on page 8.
NOTE: For preassembled horizontal adapter roof curb part
no. 50DP900211, the accessory kit includes a factory-designed, highstatic, regain transition duct. For horizontal curb part no. 50PQ900151,
a field-supplied transition duct is required.
Fig. 2 — Horizontal Adapter Roof Curbs
and Roof Curbs
IMPORTANT: The gasketing of the unit to the roof
curb or adapter roof curb is critical for a watertight
seal. Install gasket with the roof curb or adapter as shown
in Fig. 1. Improperly applied gasket can also result in
air leaks and poor unit performance.
ALTERNATE UNIT SUPPORT — When a curb or adapter
cannot be used, install unit on a noncombustible surface.
Support unit with sleepers, using unit curb 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.
NOTES:
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 on all units.
5. Weights do not include optional economizer. See Fig. 4 and 5 for
economizer weight.
6. Weights given are for aluminum evaporator and condenser coil
plate fins.
All panels must be in place when rigging.
UNIT
48TJ
016
020
024
028
DIMENSIONS
MAXIMUM SHIPPING
WEIGHT
lb
1775
1875
1985
2135
A
kg
805
850
900
968
ft-in.
6-111⁄2
6-111⁄2
6-111⁄2
6-111⁄2
B
mm
2121
2121
2121
2121
Fig. 3 — Rigging Details
3
ft-in.
4-0
3-2
3-4
3-4
mm
1219
964
1016
1016
UNIT
48TJD,
TJF016
48TJD,
TJF020
STD UNIT
WEIGHT
Lb
Kg
ECONOMIZER
WEIGHT
Lb
Kg
CORNER
A
Lb Kg
CORNER
B
Lb Kg
CORNER
C
Lb Kg
CORNER
D
Lb Kg
DIM A
DIM B
DIM C
ft-in.
mm
ft-in.
mm
ft-in.
mm
1700
771
110
50
411
186
381
173
438
199
471
213
3-3
991
3-5
1041
1-10
559
1800
816
110
50
422
192
397
180
452
205
503
228
3-2
965
3-6
1067
1-8
508
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3.
Center of Gravity.
4.
POWER EXHAUST/BAROMETRIC RELIEF
(ACCESSORY ONLY)
4
Fig. 4 — Base Unit Dimensions; 48TJ016,020
Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 78-09 (2134) for coil removal. This dimension can be reduced to 48-09 (1219)
if conditions permit coil removal from the top.
• 48-09 (1219) to combustible surfaces, all four sides (includes between units).
• Left side: 48-09 (1219) for proper condenser coil airflow.
• Front: 48-09 (1219) for control box access.
• Right side: 48-09 (1219) for proper operation of damper and power exhaust if so
equipped.
• Top: 68-09 (1829) to assure proper condenser fan operation.
• Bottom: 149 (356) to combustible surfaces (when not using curb).
• Control box side: 38-09 (914) to ungrounded surfaces, non-combustible.
• Control box side: 38-69 (1067) to block or concrete walls, or other grounded surfaces.
• Local codes or jurisdiction may prevail.
7. With the exception of clearance for the condenser coil and the damper/power exhaust as stated in Note #6, a removable fence or barricade requires no clearance.
8. Dimensions are from outside of corner post. Allow 08-5⁄169 (8) on each side for top
cover drip edge.
9. See drawing 50TJ500352 for service option details.
UNIT
48TJD,
TJF024
48TJD,
TJF028
STD UNIT
WEIGHT
ECONOMIZER
WEIGHT
CORNER
A
CORNER
B
CORNER
C
CORNER
D
DIM A
DIM B
DIM C
Lb
Kg
Lb
Kg
Lb
Kg
Lb
Kg
Lb
Kg
Lb
Kg
ft-in.
mm
ft-in.
mm
ft-in.
mm
1850
839
110
50
441
200
408
185
474
215
526
239
3-2
965
3-5
1041
1-8
508
2000
907
110
50
451
204
426
193
562
255
562
255
3-1
940
3-7
1092
1-8
508
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3.
Center of Gravity.
4.
POWER EXHAUST/BAROMETRIC RELIEF
(ACCESSORY ONLY)
5
Fig. 4 — Base Unit Dimensions; 48TJ024,028
Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 78-09 (2134) for coil removal. This dimension can be reduced to 48-09 (1219)
if conditions permit coil removal from the top.
• 48-09 (1219) to combustible surfaces, all four sides (includes between units).
• Left side: 48-09 (1219) for proper condenser coil airflow.
• Front: 48-09 (1219) for control box access.
• Right side: 48-09 (1219) for proper operation of damper and power exhaust if so
equipped.
• Top: 68-09 (1829) to assure proper condenser fan operation.
• Bottom: 149 (356) to combustible surfaces (when not using curb).
• Control box side: 38-09 (914) to ungrounded surfaces, non-combustible.
• Control box side: 38-69 (1067) to block or concrete walls, or other grounded surfaces.
• Local codes or jurisdiction may prevail.
7. With the exception of clearance for the condenser coil and the damper/power exhaust as stated in Note #6, a removable fence or barricade requires no
clearance.
8. Dimensions are from outside of corner post. Allow 08-5⁄169 (8) on each side for top
cover drip edge.
9. See drawing 50TJ500353 for service option details.
Table 1 — Physical Data
UNIT 48TJ
016D/F
208/230, 460 v
575 v
15
1700
NOMINAL CAPACITY (tons)
OPERATING WEIGHT
COMPRESSOR/MANUFACTURER
Quantity ... Model (Ckt 1 , Ckt 2)
2...ZR94KC
2
81, 81
Number of Refrigerant Circuits
Oil (oz) (Ckt 1 , Ckt 2)
REFRIGERANT TYPE
Expansion Device
Operating Charge (lb-oz)
Circuit 1 *
Circuit 2
CONDENSER COIL
Rows...Fins/in.
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor Hp...Rpm
Watts Input (Total)
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Type Drive
Nominal Cfm
Motor Hp
Motor Nominal Rpm
Maximum Continuous Bhp
Motor Frame Size
Nominal Rpm High/Low
Fan Rpm Range
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter
Min/Max (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type...Length (in.)
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Low-Medium Static
Movable Pulley Flange (rpm)
High Static
Movable Pulley Maximum Full Turns
From Closed Position
Factory Speed
Factory Speed Setting (rpm)
Low-Medium Static
High Static
Fan Shaft Diameter at Pulley (in.)
020D/F
024D/F
18
20
1800
1850
Scroll, Copeland
1...ZR108KC,
1...ZR125KC,
1...ZR94KC
1...ZR108KC
2
2
106,81
106, 106
R-22
TXV
028D/F
25
2000
1...ZR16M3,
1...ZR125KC
2
136, 106
10-10
15-5
16-0
20-13
10-10
12-3
13-6
13- 0
Cross-Hatched 3⁄8-in. Copper Tubes, Aluminum Lanced,
Aluminum Pre-Coated, or Copper Plate Fins
2...17
3...15
3...15
4...15
21.7
21.7
21.7
21.7
Propeller Type
10,500
10,500
14,200
14,200
3...22
3...22
2...30
2...30
1⁄2...1050
1⁄2...1050
1...1075
1...1075
1100
1100
3400
3400
Cross-Hatched 3⁄8-in. Copper Tubes, Aluminum Lanced or
Copper Plate Fins, Face Split
2...17
3...15
3...15
4...15
17.5
17.5
17.5
17.5
Centrifugal Type
2...10 x 10
2...10 x 10 2...12 x 12
2...12 x 12
2...12 x 12
Belt
Belt
Belt
Belt
Belt
6000
6000
7200
8000
10,000
3.7
3.0
5
7.5
10
1725
1725
1745
1745
1740
8.7
[208/230,
575
v]
10.2
[208/230,
575 v]
4.25
3.45
5.90
9.5 [460 v]
11.8 [460 v]
56H
56H
184T
213T
215T
—
—
—
—
—
891-1179
1159-1429
910-1095
1002-1225
1066-1283
1227-1550
—
1069-1287
1193-1458
1332-1550
Ball
Ball
Ball
Ball
Ball
1550
1550
1550
1550
1550
3.1/4.1
4.3/5.3
4.9/5.9
5.4/6.6
4.9/5.9
3.7/4.7
—
4.9/5.9
5.4/6.6
4.9/5.9
7 ⁄8
7 ⁄8
11⁄8
13⁄8
13⁄8
6.0
6.4
9.4
9.4
8.0
5.2
—
8.0
7.9
6.4
3
3
7
7
1 ⁄16
1 ⁄16
1 ⁄16
1 ⁄16
17⁄16
1...BX...42
1...BX...45 1...BX...50
1...BX...53
2...BX...50
1...BX...42
—
1...BX...48
1...BX...50
2...BX...47
13.5-15.5
13.5-15.5
13.3-14.8
14.6-15.4
14.6-15.4
48
44
37
37
36
55
—
34
44
45
5
5
5
5
5
3.5
3.5
3.5
3.5
3.5
1035
1296
1002
1120
1182
1389
—
1178
1328
1470
13⁄16
13⁄16
17⁄16
17⁄16
17⁄16
LEGEND
Bhp — Brake Horsepower
TXV — Thermostatic Expansion Valve
*Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator coils; and
Circuit 2 uses the upper portion of both coils.
†Rollout switch is manual reset.
**The 48TJ028 unit requires 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: The 48TJ016-028 units have a low-pressure switch (standard) located on the suction side.
6
Table 1 — Physical Data (cont)
UNIT 48TJ
FURNACE SECTION
Rollout Switch Cutout Temp (F)†
Burner Orifice Diameter (in. ...drill size)
Natural Gas
Thermostat Heat Anticipator Setting (amps)
208/230, 575 v Stage 1
Stage 2
460 v
Stage 1
Stage 2
Gas Input
Stage 1
Stage 2
Efficiency (Steady-State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas
Gas Valve Quantity
Gas Valve Pressure Range
in. wg
psig
Field Gas Connection Size (in.-FPT)
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
FREEZE PROTECTION THERMOSTAT (F)
Opens
Closes
OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)
RETURN-AIR FILTERS
Quantity...Size (in.)
POWER EXHAUST
016D/F
020D/F
024D/F
028D/F
190
190
190
190
0.1285...30/0.136...29
0.1285...30/0.136...29
0.1285...30/0.136...29
0.1285...30/0.136...29
0.98
0.44
0.80
0.44
172,000/225,000
230,000/300,000
81
15-45/30-60
0.98
0.44
0.80
0.44
206,000/270,000
275,000/360,000
81
15-45/20-50
0.98
0.44
0.80
0.44
206,000/270,000
275,000/360,000
81
15-45/20-50
0.98
0.44
0.80
0.44
206,000/270,000
275,000/360,000
81
15-45/20-50
3.3
1
3.3
1
3.3
1
3.3
1
5.5-13.5
0.235-0.487
3 ⁄4
5.5-13.5
0.235-0.487
3⁄4
5.5-13.5
0.235-0.487
3 ⁄4
5.5-13.5
0.235-0.487
3 ⁄4
426
320
27
44
30 ± 5
45 ± 5
Cleanable
2...20 X 25 X 1
1...20 X 20 X 1
Throwaway**
4...20 x 20 x 2
4...16 x 20 x 2
1⁄2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)
LEGEND
Bhp — Brake Horsepower
TXV — Thermostatic Expansion Valve
*Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator coils; and
Circuit 2 uses the upper portion of both coils.
†Rollout switch is manual reset.
**The 48TJ028 unit requires 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: The 48TJ016-028 units have a low-pressure switch (standard) located on the suction side.
7
Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors between 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.
Step 5 — Install Flue Hood and Wind Baffle —
Step 4 — Make Unit Duct Connections — Unit
Step 6 — Trap Condensate Drain — See Fig. 11
for drain location. One 3⁄4-in. half coupling is provided
inside unit evaporator section for condensate drain connection. An 81⁄2 in. x 3⁄4-in. diameter and 2-in. x 3⁄4-in. diameter
pipe nipple, coupled to standard 3⁄4-in. diameter elbows, provides a straight path down through hole in unit base rail (see
Fig. 12). A trap at least 4-in. deep must be used.
Flue hood and wind baffle are shipped secured under main
control box. To install, secure flue hood to access panel. See
Fig. 9. The wind baffle is then installed over the flue hood.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 10.
is shipped for thru-the-bottom duct connections. Ductwork
openings are shown in Fig. 1, 4, and 5. Duct connections are
shown in Fig. 6. Field-fabricated concentric ductwork may
be connected as shown in Fig. 7 and 8. Attach all ductwork
to roof curb and roof curb basepans.
NOTE: Dimensions A, A8, B, and B8 are obtained from field-supplied
ceiling diffuser.
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Shaded areas indicate block-off pans.
Fig. 6 — Air Distribution — Thru-the-Bottom
Fig. 8 — Concentric Duct Details
WIND
BAFFLE
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
Fig. 9 — Flue Hood Location
8
INDUCED DRAFT
MOTOR
COMBUSTION
FAN HOUSING
MAIN BURNER
SECTION
3/4" FPT DRAIN
CONNECTION
HEAT EXCHANGER
SECTION
1-3/8"
DRAIN HOLE
Fig. 11 — Condensate Drain Details
(48TJ016 Shown)
Fig. 10 — Combustion Fan Housing Location
Step 7 — Install Gas Piping — Unit is equipped for
use with natural gas. Installation must conform with local
building codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1.
Install field-supplied manual gas shutoff valve with a
1⁄8-in. NPT pressure tap for test gage connection at unit. Field
gas piping must include sediment trap and union. See
Fig. 13.
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing.
IMPORTANT: Natural gas pressure at unit gas connection must not be less than 5.5 in. wg or greater than
13.5 in. wg.
Fig. 12 — Condensate Drain Piping Details
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas
connection.
Step 8 — Make Electrical Connections
FIELD POWER SUPPLY — Unit is factory wired for voltage shown on unit nameplate.
When installing units, provide a disconnect per NEC
(National Electrical Code) of adequate size (Table 2).
All field wiring must comply with NEC and local
requirements.
Route power and ground lines through control box end
panel or unit basepan (see Fig. 4 and 5) to connections as
shown on unit wiring diagram and Fig. 14.
Fig. 13 — Field Gas Piping
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.
9
All wire larger than no. 18 AWG cannot be directly connected at the thermostat and will require a junction box and
splice at the thermostat.
Set heat anticipator settings as follows:
The unit must be electrically grounded in accordance
with local codes and NEC ANSI/NFPA 70 (National Fire
Protection Association).
VOLTAGE
208/230,575
460
Field wiring must conform to temperature limitations for
type ‘‘T’’ wire. All field wiring must comply with NEC and
local requirements.
Transformer no. 1 is wired for 230-v unit. If 208/230-v
unit is to be run with 208-v power supply, the transformer
must be rewired as follows:
1. Remove cap from red (208 v) wire.
2. Remove cap from orange (230 v) spliced wire.
3. Replace orange wire with red wire.
4. Recap both wires.
W1
0.98
0.80
W2
0.44
0.44
Settings may be changed slightly to provide a greater degree of comfort for a particular installation.
Refer to Accessory Remote Control Panel instructions if
required.
Step 9 — 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. 16).
OPTIONAL ECONOMIZER
Economizer Motor Control Module (See Fig. 17-19) — Set
economizer motor to the D setting (Fig. 18).
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 at OFF position.
3. Turn damper adjustment knob located on control module
clockwise slowly until dampers assume desired vent position. Do not manually operate economizer motor. Damage to motor will result.
IMPORTANT: BE CERTAIN UNUSED WIRES
ARE CAPPED. Failure to do so may damage the
transformers.
Operating voltage to compressor must be within voltage
range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2%.
Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may
cause damage to electrical components.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation instructions included with accessory. Locate thermostat assembly on a solid interior wall in the conditioned space to
sense average temperature.
Route thermostat cable or equivalent single leads of colored wire from subbase terminals through conduit in unit to
low-voltage connections as shown on unit label wiring diagram and in Fig. 15.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to
75 ft, use no. 16 AWG insulated wire (35 C minimum). For
over 75 ft, use no. 14 AWG insulated wire (35 C Minimum).
Fig. 15 — Field Control Thermostat Wiring
NOTE: The maximum wire size for TB1 is 2/0.
LEGEND
EQUIP
GND
NEC
TB
—
—
—
—
Equipment
Ground
National Electrical Code
Terminal Board
Fig. 14 — Field Power Wiring Connections
Fig. 16 — 25% Outdoor-Air Section Details
10
Table 2 — Electrical Data
UNIT
48TJ
016
(15 Tons)
020
(18 Tons)
024
(20 Tons)
028
(25 Tons)
COMPRESSOR
VOLTAGE
NOMINAL
OFM
RANGE
VOLTAGE
No. 1
No. 2
(3 Ph, 60 Hz) Min Max RLA LRA RLA LRA Qty Hp FLA (ea)
POWER COMBUSTION
EXHAUST FAN MOTOR
IFM
Hp
FLA
208/230
187
253
28.8
195
28.8
195
3
0.5
1.7
3.7 10.5/11.0
460
414
508
14.7
95
14.7
95
3
0.5
0.8
3.7
4.8
575
518
633
10.8
80
10.8
80
3
0.5
0.8
3.0
3.9
208/230
187
253
30.1
225
28.8
195
3
0.5
1.7
5.0 15.8/15.8
460
414
508
15.5
114
14.7
95
3
0.5
0.8
5.0
7.9
575
518
633
12.1
80
10.8
80
3
0.5
0.8
5.0
6.0
208/230
187
253
37.8
239
30.1
225
2
1
6.6
7.5 25.0/25.0
460
414
508
17.2
125
15.5
114
2
1
3.3
7.5
13.0
575
518
633
12.4
80
12.1
80
2
1
3.4
7.5
10.0
208/230
187
253
41.0
350
37.8
239
2
1
6.6
10.0 28.0/28.0
460
414
508
21.8
158
17.2
125
2
1
3.3
10.0
14.6
575
518
633
17.3
125
12.4
80
2
1
3.4
10.0
13.0
LEGEND
FLA
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
LRA
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
FLA
0.57
0.57
0.30
0.30
0.57
0.57
0.57
0.57
0.30
0.30
0.57
0.57
0.57
0.57
0.30
0.30
0.57
0.57
0.57
0.57
0.30
0.30
0.57
0.57
POWER
SUPPLY
MCA
81/81
85/86
40
43
30
32
87/87
92/92
44
47
34
36
116/116
120/120
57
59
44
46
130/130
135/135
66
68
54
56
MOCP*
100/100
110/110
50
50
40
40
110/110
110/110
50
60
40
40
150/150
150/150
70
70
50
50
150/150
175/175
80
80
70
70
EXAMPLE: Supply voltage is 460-3-60.
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
OFM
— Outdoor (Condenser) Fan Motor
RLA
— Rated Load Amps
*Fuse or HACR circuit breaker.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
3
1371
=
3
= 457
Average Voltage =
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.
7
% Voltage Imbalance = 100 x
457
= 1.53%
NOTES:
1. In compliance with NEC requirements for multimotor and combination 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
Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine
the percent voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
11
Fig. 19 — Economizer Motor Control
Module Location
Fig. 17 — Economizer Damper
Assembly-End View
LEGEND
Fig. 20 — Outdoor-Air Hood Component Location
LED — Light-Emnitting Diode
Fig. 18 — Economizer Motor Control Module
(Part Number W7459A)
Step 10 — Install Outdoor-Air Hood — The outdoorair hood is common to 25% air ventilation and economizer.
If economizer is used, all electrical connections have been
made and adjusted at the factory. Assemble and install hood
in the field.
NOTE: The hood top panel, upper and lower filter retainers, hood drain pan, baffle (sizes 024-028), 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 hardware are in a package
located inside the return-air filter access panel (Fig. 20).
1. Attach seal strip to upper filter retainer. See Fig. 21.
2. Assemble hood top panel, side panels, upper filter
retainer, and drain pan (see Fig. 22).
Fig. 21 — Seal Strip Location
12
4. Remove OAT from the outside of the economizer (see
Fig. 16).
5. Mount the enthalpy sensor (Fig. 23) to the economizer on
the outside of the unit (in the same location from which
the OAT was removed) using the 2 screws provided. See
Fig. 16.
6. Reconnect the blue wire removed in Step 3 to the enthalpy sensor terminal +.
7. Cut the violet wire provided to desired length and terminate with quick-connect terminal provided. Route the
violet wire from the enthalpy sensor terminal S, through
the snap bushing, and to the economizer control module
terminal SO . See Fig. 18.
8. Set changeover set point to the desired location.
See Fig. 24.
NOTE: For maximum benefit of outdoor air, set the enthalpy control to the ‘‘A’’ setting. At this setting, when
the relative humidity is 50% and the outdoor air is below
74 F, the relay contacts on the sensor will be closed.
9. Reinstall economizer hoods if removed.
BAFFLE
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD TOP
PANEL
HOOD SIDE
PANELS (2)
BAFFLE
(024 TO
028 ONLY)
IMPORTANT: Be sure all seal strips and RTV sealant
are intact. A watertight seal to inside of unit must be
maintained.
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
Fig. 22 — Outdoor-Air Hood Details
+
3. Secure lower filter retainer and support bracket to unit.
See Fig. 22. Leave screws loose on 024 and 028 units.
4. Slide baffle (sizes 024 and 028) behind lower filter retainer and tighten screws.
5. Loosen sheet metal screws for top panel of base unit
located above outdoor-air inlet opening, and remove screws
for hood side panels located on the sides of the outdoorair inlet opening.
6. Match notches in hood top panel with unit top panel screws.
Insert hood flange between 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
created by lower filter retainer and filter support bracket.
9. Attach remaining section of filter support bracket.
ENTHALPY CONTROL INSTALLATION
NOTE: The accessory outdoor-air enthalpy sensor must be
installed BEFORE the economizer hoods are installed on the
unit or hoods will have to be removed.
1. Remove and discard the factory-installed jumper assembly containing the 800-ohm resistor on the economizer
control module (between terminals SR and +). See Fig. 18.
2. Remove black wire assembly containing the 620-ohm resistor from between economizer control module terminal
SO and the outdoor-air thermostat (OAT). Place this wire
assembly (containing the 620-ohm resistor) between economizer control module terminals SR and +, replacing the
jumper removed in Step 1. See Fig. 18.
3. Disconnect the blue wire from the OAT.
Fig. 23 — Outdoor-Air and Return-Air
EnthalpySensor
POINT
CONTROL CONTROL
(Approx Deg)
CURVE
AT 50% RH
A
73
B
68
C
63
D
58
RH — Relative Humidity
Fig. 24 — Psychrometric Chart for Solid-State
Enthalpy Control
13
DIFFERENTIAL ENTHALPY CONTROL
NOTE: The accessory outdoor-air enthalpy sensor must be
installed BEFORE the economizer hoods are installed on the
unit or hoods will have to be removed.
1. Remove and discard the factory-installed jumper assembly containing the 800-ohm resistor on the economizer
control module (between terminals SR and +. See Fig. 18.
2. Disconnect black wire from economizer control module
terminal SO and blue wire from the OAT (outdoor-air
thermostat).
3. Remove OAT and black wire assembly containing the
620-ohm resistor from the outside of the economizer (see
Fig. 16).
4. Mount the outdoor-air enthalpy sensor (first sensor) to
the economizer on the outside of the unit (in the same
location from which the OAT was removed) using the 2
screws provided. See Fig. 16.
5. Reconnect the blue wire removed in Step 2 to the enthalpy sensor terminal +.
6. Cut the violet wire provided to desired length and terminate with quick-connect terminal provided. Route the
violet wire from the enthalpy sensor terminal S, through
the snap bushing, and to the economizer control module
terminal SO.
7. Mount the second enthalpy sensor in the return-air duct
(return-air sensor).
8. Route the blue wire (provided) from terminal + on the
return-air enthalpy sensor to the economizer control module terminal +.
9. Route the violet wire (provided) from terminal S on the
return-air enthalpy sensor to the economizer control module terminal SR.
10. Turn changeover set point dial clockwise past the ‘‘D’’
setting, or the control will not operate on a differential.
See Fig. 18.
11. Reinstall economizer hood if removed.
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 outdoor 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 existing motor mount with the new motor mount provided with
accessory.
Transformer (460 and 575-v Units Only ) — On 460 and
575-v 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,
vertically, with leads protruding from bottom of extrusion.
MOTORMASTER III CONTROL INSTALLATION
(48TJ024 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.
To avoid damage to the refrigerant coils and electrical
components, use recommended screw sizes only. Use
care when drilling holes.
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 Motormaster III control. Set the switch to accept the thermistor
sensor input signal. Set the frequency to match the unit power
supply (60 Hz).
Motormaster III Control — Recommended mounting location is beneath the control box, mounted to the partition that
separates the control box section from the indoor section.
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.
IMPORTANT: Be sure all seal strips and RTV sealant
are intact. A watertight seal to inside of unit must be
maintained.
Step 11 — Install All Accessories — After all the
factory-installed options have been adjusted, install all fieldinstalled accessories. Refer to the accessory installation instructions included with each accessory.
MOTORMASTERt I CONTROL INSTALLATION (48TJ016
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.
To avoid damage to the refrigerant coils and electrical
components, use recommended screw sizes only. Use
care when drilling holes.
14
SENSOR
LOCATION
NOTE: Dimensions in (
SENSOR
LOCATION
) are in mm.
Fig. 25 — Wind Baffle Details
HAIRPIN END
48TJ024
HAIRPIN END
48TJ028
NOTE: all sensors are located on the eighth hairpin up from the
bottom.
Fig. 27 — Motormaster III Sensor Locations
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 applicable codes.
Compressor Mounting — Compressors are internally spring mounted. Do not loosen or remove compressor
holddown bolts.
Refrigerant Service Ports — Each refrigerant system 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 Schradertype valves are located underneath the low-pressure switches.
Be sure that caps on the ports are tight.
SENSOR
LOCATION
SENSOR
LOCATION
HAIRPIN END
Compressor Rotation — It is important to be certain
the compressors are rotating in the proper direction. To determine whether or not compressors are rotating in the proper
direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.
HAIRPIN END
48TJ016
48TJ020
NOTE: All sensors are located on the eighth hairpin up from the
bottom.
Fig. 26 — MotormasterT I Sensor Locations
15
If the suction pressure does not drop and the discharge
pressure 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.
After a few minutes of reverse operation, the scroll compressor internal overload protection will open, which will
activate the unit’s lockout and requires a manual reset. Reset
is accomplished by turning the thermostat on and off.
Condenser-Fans and Motors — Condenser fans and
motors are factory set. Refer to Condenser-Fan Adjustment
section on page 23 as required. Be sure that fans rotate in the
proper direction.
Internal Wiring — Check all electrical connections in
Gas Heat — Verify gas pressures before turning on heat
as follows:
1. Turn off manual gas stop.
2. Connect pressure gage to supply gas pressure tap (see
Fig. 13).
3. Connect pressure gage to manifold pressure tap on gas
valve.
4. Turn on manual gas stop and set thermostat to HEAT
position. After the unit has run for several minutes, verify
that incoming pressure is 5.5 in. wg or greater, and that
the manifold pressure is 3.3 in. wg. If manifold pressure
must be adjusted, refer to Gas Valve Adjustment section
on page 25.
5. After unit has been in operation for 5 minutes, check temperature rise across the heat exchangers. See unit informative plate for correct rise limits of the heat supplied.
Air quantities may need to be adjusted to bring the actual
rise to within the allowable limits.
Return-Air Filters — Check that correct filters are installed in filter tracks (see Table 1). Do not operate unit without return-air filters.
Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
Accessory Economizer Adjustment — Remove
filter access panel. Check that outdoor-air damper is closed
and return-air damper is open.
Economizer operation and adjustment are described in
Base Unit Operation section on page 20, and in Economizer
Adjustment section on page 24.
unit control boxes; tighten as required.
Crankcase Heater(s) (Size 028 Only) — Crankcase heater(s) is energized as long as there is power to the
unit and the compressor is not operating.
IMPORTANT: Unit power must be on for 24 hours
prior to start-up. Otherwise, damage to compressor may
result.
Evaporator Fan — Fan belt and variable pulleys are
factory-installed. See Tables 3-8 for Fan Performance Data.
Be sure that fans rotate in the proper direction. See Table 9
for air quantity limits. See Tables 10 and 11 for static pressure information for accessories and options. See Table 12
for fan rpm at various motor pulley settings. To alter fan performance, see Evaporator Fan Performance Adjustment section on page 22.
NOTE: A 31⁄2-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
fan motor.
16
Table 3 — Fan Performance — 48TJD016 (Low Heat Units)
AIRFLOW
(Cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
Rpm
809
850
892
934
976
1019
1063
1106
1150
—
—
0.2
Bhp
1.53
1.76
2.01
2.28
2.58
2.90
3.24
3.61
4.00
—
—
Rpm
1301
1324
1349
1374
1402
—
—
—
—
—
—
1.4
Bhp
2.87
3.13
3.41
3.71
4.04
—
—
—
—
—
—
AIRFLOW
(Cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
Watts
1317
1516
1733
1970
2225
2500
2795
3111
3448
—
—
Watts
2477
2700
2942
3202
3481
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm Bhp Watts Rpm Bhp Watts Rpm
1502
994 1.96
1690
1078 2.18
1882
1156
1706
1027 2.20
1899
1107
2.43
2094
1183
1928
1061 2.46
2125
1138
2.70
2325
1211
2169
1096 2.75
2371
1170
2.99
2575
1241
2429
1132
3.06
2635
1204 3.30
2843
1272
2709
1168
3.38
2919
1238 3.63
3131
1304
3008
1206 3.74
3223
1273 3.99
3439
1337
3329
1244
4.11
3547
1309 4.37
3767
—
3670
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Rpm
906
942
979
1017
1056
1096
1136
1177
1218
—
—
0.4
Bhp
1.74
1.98
2.24
2.52
2.82
3.14
3.49
3.86
4.26
—
—
Rpm
1369
1390
1413
1437
1463
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp Watts Rpm Bhp Watts Rpm Bhp
3.11
2683
1434 3.35
2891
1497 3.47
3.37
2909
1454 3.62
3120
1515 3.74
3.66
3153
1475 3.90
3367
1535 4.03
3.96
3416
1498 4.21
3633
—
—
4.29
3699
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Watts
2997
3226
3475
—
—
—
—
—
—
—
—
Rpm
1497
1515
1535
—
—
—
—
—
—
—
—
1.0
Bhp
2.41
2.66
2.93
3.22
3.54
3.88
4.24
—
—
—
—
Watts
2077
2293
2528
2781
3053
3345
3657
—
—
—
—
2.0
Bhp
3.60
3.87
4.16
—
—
—
—
—
—
—
—
Watts
3103
3334
3584
—
—
—
—
—
—
—
—
Rpm
1230
1255
1281
1309
1338
1368
—
—
—
—
—
1.2
Bhp
2.64
2.89
3.17
3.47
3.79
4.13
—
—
—
—
—
Watts
2275
2495
2733
2990
3266
3562
—
—
—
—
—
3065 (575 v). Do not adjust motor rpm such that motor maximum bhp and/or
watts is exceeded at the maximum operating cfm.
3. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table.
4. Interpolation is permissible. Do not extrapolate.
5. Fan performance is based on wet coils, clean filters, and casing losses. See
Table 10 for accessory/FIOP static pressure information.
6. 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.
7. Use of a field-supplied motor may affect wiring size. Contact your Carrier
representative for details.
LEGEND
Bhp
— Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Standard low-medium static drive range is 891 to 1179 rpm (for 208/230460-v units) or 1159 to 1429 rpm (for 575-v units). Alternate high-static drive
range is 1227 to 1550 (for 208/230-460-v units). The alternate high-static
drive is not available for 48TJ016 575-v units. Other rpms require a fieldsupplied drive.
2. Maximum continuous bhp is 4.25 (208/230-460 v) or 3.45 (575 v)
and the maximum continuous watts are 3775 (208/230-460 v) or
Table 4 — Fan Performance — 48TJD020 and 024 (Low Heat Units)
AIRFLOW
(Cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Rpm
755
810
866
923
980
1038
1096
1154
1213
1272
0.2
Bhp
2.27
2.72
3.22
3.78
4.39
5.06
5.78
6.56
7.40
8.30
Rpm
1149
1183
1219
1258
1299
1341
1385
1431
1478
—
1.4
Bhp
4.28
4.76
5.29
5.88
6.52
7.21
7.97
8.78
9.65
—
AIRFLOW
(Cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Watts
1908
2287
2710
3177
3690
4251
4859
5517
6224
6983
Watts
3602
4003
4450
4942
5480
6065
6699
7382
8114
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm Bhp Watts Rpm Bhp Watts Rpm
2171
901 2.91
2443
968 3.24
2723
1031
2556
947 3.37
2833
1010 3.71
3116
1070
2985
994 3.88
3266
1054 4.23
3554
1111
3458
1044 4.45
3744
1100 4.80
4036
1155
3976
1094 5.07
4267
1148 5.43
4564
1200
4542
1146 5.75
4838
1197
6.11
5138
1246
5156
1198 6.49
5456
1247 6.85
5761
1294
5818
1251 7.28
6123
1298 7.65
6432
1343
6531
1306 8.13
6840
1350 8.51
7154
1394
7294
1360 9.05
7608
1403 9.43
7926
1445
Rpm
831
881
932
985
1038
1093
1148
1204
1260
1317
0.4
Bhp
2.58
3.04
3.55
4.11
4.73
5.40
6.13
6.92
7.77
8.67
Rpm
1204
1236
1270
1307
1346
1387
1429
1473
1519
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp
Watts Rpm Bhp Watts Rpm Bhp
4.65
3907
1258 5.02
4217
1284 5.20
5.13
4310
1288 5.50
4622
1313 5.68
5.66
4759
1320 6.03
5073
1344 6.22
6.25
5253
1355 6.62
5569
1378 6.81
6.89
5794
1392 7.27
6113
1415 7.46
7.59
6383
1392 7.97
6704
1453 8.16
8.35
7019
1472 8.73
7343
1493 8.93
9.15
7705
1515 9.55
8032
1535 9.75
10.04
8441
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND
Bhp
— Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
3.
4.
5.
NOTES:
1. 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.
2. 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 (460 v). The maximum
continuous watts for the 020 size is 5180. The maximum continuous watts
for the 024 size is 7915 (208/230, 575 v) or 8640 (460 v). Do not adjust
6.
7.
17
Watts
4375
4780
5232
5729
6273
6866
7506
8196
—
—
Rpm
1309
1337
1368
1402
1437
1475
1514
—
—
—
1.0
Bhp
3.58
4.05
4.57
5.15
5.78
6.47
7.22
8.02
8.88
9.81
2.0
Bhp
5.39
5.87
6.41
7.00
7.65
8.36
9.12
—
—
—
Watts
3009
3406
3847
4333
4864
5443
6070
6745
7471
8247
Rpm
1091
1127
1166
1207
1250
1294
1340
1388
1436
1486
1.2
Bhp
3.93
4.40
4.93
5.51
6.15
6.84
7.59
8.40
9.26
10.19
Watts
3302
3702
4146
4635
5170
5752
6382
7062
7791
8570
Watts
4533
4939
5391
5890
6435
7028
7670
—
—
—
motor rpm such that motor maximum bhp and/or watts is exceeded at the
maximum operating cfm.
Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table.
Interpolation is permissible. Do not extrapolate.
Fan performance is based on wet coils, clean filters, and casing losses. See
Table 11 for accessory/FIOP static pressure information.
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.
Use of a field-supplied motor may affect wiring size. Contact your Carrier
representative for details.
Table 5 — Fan Performance — 48TJD028 (Low Heat Units)
AIRFLOW
(Cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Rpm
941
999
1058
1117
1177
1237
1297
1358
1418
1449
Rpm
1274
1316
1360
1406
1453
1501
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Bhp
Watts Rpm
Bhp
Watts Rpm Bhp
6.35
5248
1323
6.92
5,718 1371 5.54
7.20
6960
1364
7.79
6,437 1410 6.41
8.14
6734
1406
8.76
7,239 1450 7.40
9.20
7605
1449
9.83
8,129 1492 8.48
10.36
8568
1495 11.02
9,111 1536 9.69
11.64
9627
1541 12.32 10,190
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AIRFLOW
(Cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Watts
2,769
3,348
4,007
4,750
5,583
6,511
7,450
8,674
9,919
10,585
Rpm
1002
1057
1113
1169
1226
1284
1342
1400
1459
—
0.4
Bhp
3.80
4.53
5.35
6.28
7.31
8.46
9.74
11.14
12.67
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm Bhp Watts Rpm Bhp
Watts Rpm
3,140 1061
4.27 3528
1117
4.76
3,934 1171
3,742 1112
5.02 4152 1166
5.54
4,579 1218
4,424 1165
5.87 4856 1216
6.41
5,304 1266
5,190 1219
6.83 5645 1268
7.40
6,114 1315
6,047 1274
7.89 6524 1320
8.48
7,015 1365
6,999 1329
9.07 7499 1374
9.69
8,012 1417
8,051 1385 10.37 8574 1428 11.02
9,110 1469
9,209 1442 11.80 9755 1483 12.47 10,314 1523
10,478
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.2
Bhp
3.35
4.05
4.85
5.74
6.75
7.98
9.12
10.49
12.00
12.80
1.0
Bhp
5.27
6.07
6.97
7.98
9.09
10.33
11.68
13.16
—
—
Watts
4,356
5,020
5,766
6,597
7,520
8,538
9,657
10,883
—
—
Rpm
1224
1268
1314
1361
1410
1459
1510
—
—
—
1.2
Bhp
5.80
6.63
7.55
8.58
9.72
10.98
12.36
—
—
—
Watts
4,794
5,478
6,243
7,094
8,037
9,076
10,217
—
—
—
Watts
6204
6939
7759
8666
9667
—
—
—
—
—
LEGEND
Bhp
— Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
3. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table.
4. Interpolation is permissible. Do not extrapolate.
5. Fan performance is based on wet coils, clean filters, and casing losses. See
Table 11 for accessory/FIOP static pressure information.
6. 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.
7. Use of a field-supplied motor may affect wiring size. Contact your Carrier
representative for details.
NOTES:
1. Standard low-medium static drive range is 1066 to 1283 rpm.
Alternate high-static drive range is 1332 to 1550. Other rpms require a fieldsupplied drive.
2. Maximum continuous bhp is 10.2 (208/230, 575 v) or 11.8 (460 v) and the
maximum continuous watts are 9510 (208/230, 575 v) or 11,000 (460 v). Do
not adjust motor rpm such that motor maximum bhp and/or watts is exceeded at the maximum operating cfm.
Table 6 — Fan Performance — 48TJF016 (High Heat Units)
AIRFLOW
(Cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
Rpm
819
861
904
947
990
1034
1078
1123
1167
—
—
0.2
Bhp
1.55
1.78
2.04
2.32
2.62
2.94
3.29
3.67
4.06
—
—
Rpm
1304
1327
1353
1380
1408
—
—
—
—
—
—
1.4
Bhp
2.88
3.14
3.43
3.73
4.06
—
—
—
—
—
—
AIRFLOW
(Cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
Watts
1335
1538
1759
1999
2259
2539
2840
3161
3504
—
—
Watts
2484
2711
2955
3219
3503
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm Bhp Watts Rpm Bhp Watts Rpm
1518
1001 1.98
1705
1083 2.20
1894
1160
1726
1035 2.22
1916
1113
2.45
2110
1188
1952
1069 2.49
2147
1145
2.72
2345
1218
2197
1105
2.78
2396
1179
3.01
2598
1248
2461
1142
3.09
2665
1213 3.33
2871
1280
2745
1180
3.42
2953
1248 3.67
3163
1313
3050
1218 3.78
3262
1284 4.03
3476
1348
3376
1258 4.16
3592
—
—
—
—
3723
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Rpm
914
951
989
1028
1068
1109
1150
1192
1234
—
—
0.4
Bhp
1.76
2.00
2.26
2.55
2.85
3.18
3.54
3.91
4.32
—
—
Rpm
1371
1393
1417
1442
1468
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp Watts Rpm Bhp Watts Rpm Bhp
3.12
2688
1435 3.36
2895
1467 3.48
3.38
2917
1456 3.62
3126
1486 3.75
3.67
3165
1478 3.92
3377
1508 4.04
3.98
3432
1502 4.23
3646
1531 4.35
4.31
3718
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND
Bhp
— Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
Watts
2999
3232
3484
3755
—
—
—
—
—
—
—
Rpm
1497
1517
1537
—
—
—
—
—
—
—
—
1.0
Bhp
2.42
2.68
2.95
3.25
3.57
3.91
4.28
—
—
—
—
Watts
2088
2307
2545
2802
3079
3375
3692
—
—
—
—
2.0
Bhp
3.60
3.87
4.16
—
—
—
—
—
—
—
—
Watts
3104
3338
3592
—
—
—
—
—
—
—
—
Rpm
1234
1259
1287
1315
1345
1376
—
—
—
—
—
1.2
Bhp
2.65
2.91
3.17
3.49
3.81
4.16
—
—
—
—
—
Watts
2284
2507
2749
3009
3289
3589
—
—
—
—
—
3. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table.
4. Interpolation is permissible. Do not extrapolate.
5. Fan performance is based on wet coils, clean filters, and casing losses. See
Table 10 for accessory/FIOP static pressure information.
6. 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.
7. Use of a field-supplied motor may affect wiring size. Contact your Carrier
representative for details.
NOTES:
1. Standard low-medium static drive range is 891 to 1179 rpm (for 208/230460-v units) or 1159 to 1429 rpm (for 575-v units). Alternate high-static drive
range is 1227 to 1550 (for 208/230-460-v units). The alternate high-static
drive is not available for 48TJ016 575-v units. Other rpms require a fieldsupplied drive.
2. Maximum continuous bhp is 4.25 (208/230-460 v) or 3.45 (575 v)
and the maximum continuous watts are 3775 (208/230-460 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.
18
Table 7 — Fan Performance — 48TJF020 and 024 (High Heat Units)
AIRFLOW
(Cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Rpm
795
854
914
975
1037
1099
1161
1223
1286
1349
0.2
Bhp
2.43
2.92
3.46
4.06
4.72
5.44
6.22
7.07
7.98
8.95
Rpm
1173
1211
1252
1295
1340
1388
1436
1486
1538
—
1.4
Bhp
4.44
4.95
5.53
6.16
6.85
7.60
8.41
9.28
10.22
—
AIRFLOW
(Cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Watts
2043
2452
2909
3414
3969
4575
5232
5943
6708
7528
Watts
3732
4165
4646
5176
5756
6388
7071
7807
8597
—
Rpm
866
921
977
1034
1092
1150
1210
1270
1331
1392
Rpm
1227
1263
1302
1343
1386
1431
1478
1527
—
—
0.4
Bhp
2.74
3.24
3.79
4.39
5.06
5.79
6.57
7.43
8.34
9.32
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm Bhp Watts Rpm
Bhp
Watts Rpm
2306
934 3.07
2578
998
3.40
2856
1059
2722
984 3.57
3998
1044
3.90
3281
1102
3184
1036 4.12
3465
1093
4.46
3752
1148
3695
1090 4.73
3981
1144
5.08
4272
1196
4255
1145 5.41
4546
1196
5.76
4842
1256
4866
1201 6.14
5162
1249
6.50
5462
1297
5529
1258 6.93
5829
1304
7.29
6134
1349
6245
1315 7.79
6550
1360
8.16
6869
1403
7014
1374 8.71
7324
1416
9.08
7638
1457
7839
1433 9.70
8154
1473 10.07
8471
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp Watts Rpm Bhp Watts Rpm Bhp
4.80
4036
1279 5.17
4345
1304 5.35
5.32
4471
1313 5.69
4782
1337 5.87
5.89
4954
1350 6.26
5267
1373 6.56
6.52
5487
1389 6.90
5802
1412 7.09
7.22
6070
1431 7.60
6387
1452 7.79
7.97
6704
1474 8.35
7024
1495 8.54
8.79
7390
1520 9.17
7713
1540 9.37
9.67
8130
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND
Bhp
— Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
Watts
4502
4939
5425
5961
6547
7186
7876
—
—
—
Rpm
1329
1361
1396
1434
1474
1516
—
—
—
—
1.0
Bhp
3.74
4.25
4.81
5.43
6.12
6.86
7.66
8.53
9.46
—
Watts
3142
3570
4045
4569
5142
5766
6443
7171
7954
—
2.0
Bhp
5.54
6.06
6.64
7.28
7.98
8.74
—
—
—
—
Watts
4629
5097
5584
6121
6709
7348
—
—
—
—
Rpm
1117
1158
1201
1246
1294
1343
1393
1445
1498
—
1.2
Bhp
4.08
4.60
5.16
5.79
6.48
7.22
8.03
8.90
9.84
—
Watts
3434
3865
4343
4870
5447
6075
6755
7487
8274
—
motor rpm such that motor maximum bhp and/or watts is exceeded at the
maximum operating cfm.
3. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table.
4. Interpolation is permissible. Do not extrapolate.
5. Fan performance is based on wet coils, clean filters, and casing losses. See
Table 11 for accessory/FIOP static pressure information.
6. 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.
7. Use of a field-supplied motor may affect wiring size. Contact your Carrier
representative for details.
NOTES:
1. 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.
2. 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 (460 v). The maximum
continuous watts for the 020 size is 5180. The maximum continuous watts
for the 024 size is 7915 (208/230, 575 v) or 8640 (460 v). Do not adjust
Table 8 — Fan Performance — 48TJF028 (High Heat Units)
AIRFLOW
(Cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Rpm
992
1055
1118
1182
1246
1310
1374
1439
1503
1536
Rpm
1311
1358
1406
1456
1507
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Bhp
Watts Rpm
Bhp
Watts Rpm Bhp Watts
6.51
5385
1359
6.96
5751
1405 6.00
6124
7.30
6039
1403
7.76
6412
1448 6.84
6792
8.17
6767
1560
8.63
7137
1492 7.75
7524
9.12
7541
1498
9.59
7929
1539 8.75
8323
10.15
8393
1548 10.63
8790
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AIRFLOW
(Cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Watts
3,348
3,947
4,610
5,339
6,136
7,005
7,947
8,964
10,059
10,636
Rpm
1051
1110
1170
1231
1292
1354
1416
1479
1542
—
0.4
Bhp
4.44
5.17
5.99
6.88
7.86
8.92
10.07
11.32
12.65
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm
Bhp
Watts Rpm
Bhp
Watts Rpm
3,668 1106
4.83 3995
1160
5.24 4331 1212
4,277 1162
5.58 4615 1214
6.00 4960 1263
4,950 1220
6.41 5298 1268
6.84 5653 1315
5,690 1278
7.31 6047 1324
7.75
6411
1369
6,498 1337
8.30 6865 1381
8.75 7239 1424
7,377 1397
9.38 7754 1439
9.84 8137 1480
8,329 1457 10.54 8715 1497 11.02
9107 1537
9,356 1518 11.79
9752
—
—
—
—
10,460
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.2
Bhp
4.05
4.77
5.58
6.46
7.42
8.47
9.61
10.84
12.17
12.86
LEGEND
Bhp
— Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
1.0
Bhp
5.65
6.43
7.27
8.20
9.21
10.31
11.50
—
—
—
Watts
4675
5312
6014
6782
7618
8525
9504
—
—
—
Rpm
1262
1311
1361
1413
1466
1520
—
—
—
—
1.2
Bhp
6.08
6.86
7.72
8.66
9.68
10.79
—
—
—
—
Watts
5026
5672
6382
7158
8003
8918
—
—
—
—
3. Static pressure losses (i.e., economizer) must be added to external static
pressure before entering Fan Performance table.
4. Interpolation is permissible. Do not extrapolate.
5. Fan performance is based on wet coils, clean filters, and casing losses. See
Table 11 for accessory/FIOP static pressure information.
6. 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.
7. Use of a field-supplied motor may affect wiring size. Contact your Carrier
representative for details.
NOTES:
1. Standard low-medium static drive range is 1066 to 1283 rpm.
Alternate high-static drive range is 1332 to 1550. Other rpms require a fieldsupplied drive.
2. Maximum continuous bhp is 10.2 (208/230, 575 v) or 11.8 (460 v) and the
maximum continuous watts are 9510 (208/230, 575 v) or 11,000 (460 v). Do
not adjust motor rpm such that motor maximum bhp and/or watts is exceeded at the maximum operating cfm.
19
Table 9 — Air Quantity Limits
UNIT
48TJ
MINIMUM
COOLING
CFM
016
020
024
028
4500
5400
6000
7000
MINIMUM
HEATING CFM
Low Heat
High Heat
3800
3800
4750
5450
4750
5450
4560
5450
Base Unit Operation
COOLING, UNITS WITHOUT ECONOMIZER — 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 evaporatorfan motor (IFM), compressor no. 1 and condenser fan start.
The condenser-fan motors run continuously while unit is cooling. If the thermostat calls for a second stage of cooling by
energizing Y2, compressor contactor no. 2 (C2) is energized
and compressor no. 2 starts.
MAXIMUM
CFM
7,500
9,000
10,000
11,250
HEATING, UNITS WITHOUT ECONOMIZER
NOTE: The 48TJ016-028 units have 2 stages of heat.
When the thermostat calls for heating, power is sent to W
on the IGC (integrated gas unit controller) board. An LED
(light-emitting diode) on the IGC board will be on during
normal operation. A check is made to ensure that the rollout
switch and limit switch are closed and the induced-draft motor is running. The induced-draft motor is then energized,
and when speed is proven with the hall effect sensor on the
motor, the ignition activation period begins. The burners will
ignite within 5 seconds.
If the burners do not light, there is a 22-second delay before another 5-second attempt. If the burners still do not light,
this sequence is repeated for 15 minutes. After the 15 minutes have elapsed, if the burners still have not lighted, heating is locked out. To reset the control, break 24-v power to
the thermostat.
When ignition occurs the IGC board will continue to monitor the condition of the rollout and limit switches, the hall
effect sensor, as well as the flame sensor. If the unit is
controlled through a room thermostat set for fan auto.,
45 seconds after ignition occurs, the indoor-fan motor will
be energized (and the outdoor-air dampers will open to their
minimum position). If for some reason the overtemperature
limit opens prior to the start of the indoor fan blower, on the
next attempt, the 45-second delay will be shortened to 5 seconds less than the time from initiation of heat to when the
limit tripped. Gas will not be interrupted to the burners and
heating will continue. Once modified, the fan on delay will
not change back to 45 seconds unless power is reset to the
control.
Table 10 — Accessory/FIOP Static Pressure*
(in. wg) — 48TJ016
COMPONENT
4500
0.04
Economizer
CFM
6000
0.07
5000
0.05
7200
0.09
7500
0.10
LEGEND
FIOP — Factory-Installed Option
*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.
Table 11 — Accessory/FIOP Static Pressure*
(in. wg) — 48TJ020-028
COMPONENT
Economizer
5000
0.06
6000
0.07
7200
0.09
CFM
9000
0.11
10,000
0.12
11,250
0.14
LEGEND
FIOP — Factory-Installed Option
*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.
Table 12 — Fan Rpm at Motor Pulley Settings*
UNIT
48TJ
016 (208/230, 460 v)†
016 (208/230, 460 v)**
016 (575 v)†
020†
020**
024†
024**
028†
028**
0
††
††
††
††
††
††
††
††
††
⁄
††
††
††
††
††
††
††
††
††
12
1
1179
1559
1429
1095
1287
1225
1458
1283
—
11⁄2
1150
1522
1403
1077
1265
1209
1434
1269
—
2
1121
1488
1376
1058
1243
1187
1407
1247
1551
MOTOR PULLEY TURNS OPEN
21⁄2
3
31⁄2
4
1093
1064
1035
1006
1455
1422
1389
1356
1349
1323
1296
1269
1040
1021
1002
984
1222
1200
1178
1156
1165
1143
1120
1098
1381
1354
1328
1301
1225
1203
1182
1160
1524
1497
1470
1443
*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.
NOTE: For speeds not listed above, field-supplied drives are required.
20
41⁄2
978
1323
1242
965
1134
1076
1275
1138
1415
5
949
1289
1215
947
1112
1053
1248
1116
1388
51⁄2
920
1256
1188
928
1091
1031
1222
1095
1361
6
891
1227
1159
910
1069
1002
1193
1066
1332
Once frost has melted, the compressors can be reenergized
by resetting the compressor lockout.
HEATING, UNITS WITH ECONOMIZER — Outdoor-air
damper stays at VENT position while evaporator fan is
operating. Refer to Heating, Units without Economizer section on this page for heating sequence of operation.
When additional heat is required, W2 closes and initiates
power to the second stage of the main gas valve. When the
thermostat is satisfied, W1 and W2 open and the gas valve
closes, interrupting the flow of gas to the main burners. If
the call for W1 lasted less than 1 minute, the heating cycle
will not terminate until 1 minute after W1 became active. If
the unit is controlled through a room thermostat set for fan
auto., the indoor-fan motor will continue to operate for an
additional 45 seconds then stop (and the outdoor-air dampers will close). If the overtemperature limit opens after the
indoor motor is stopped within 10 minutes of W1 becoming inactive, on the next cycle the time will be extended by
15 seconds. The maximum delay is 3 minutes. Once modified, the fan off delay will not change back to 45 seconds
unless power is reset to the control.
A LED indicator is provided on the IGC to monitor
operation. The IGC is located by removing the side panel
and viewing the IGC through the view port located in the
control box access panel. See Fig. 28. During normal
operation, the LED is continuously on. See Table 13 for
error codes.
SERVICE
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Cleaning — Inspect unit interior at beginning of each heating and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interior.
MAIN BURNER — At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or
other causes. Observe the main burner flames. Refer to Main
Burners section on page 25.
FLUE GAS PASSAGEWAYS — The flue collector box and
heat exchanger cells may be inspected by removing heat exchanger access panel (Fig. 4 and 5), flue box cover, and main
burner assembly (Fig. 28). Refer to Main Burners section
on page 25 for burner removal sequence. If cleaning is required, remove heat exchanger baffles and clean tubes with
a wire brush.
Use caution with ceramic heat exchanger baffles. When
installing retaining clip, be sure the center leg of the clip
extends inward toward baffle. See Fig. 29.
COMBUSTION-AIR BLOWER — Clean periodically to assure proper airflow and heating efficiency. Inspect blower
wheel every fall and periodically during heating season. For
the first heating season, inspect blower wheel bi-monthly to
determine proper cleaning frequency.
To inspect blower wheel, remove heat exchanger access
panel. Shine a flashlight into opening to inspect wheel. If
cleaning is required, remove motor and wheel assembly by
removing screws holding motor mounting plate to top of combustion fan housing (Fig. 28). The motor and wheel assembly will slide up and out of the fan housing. Remove the
blower wheel from the motor shaft and clean with a detergent or solvent. Replace motor and wheel assembly.
EVAPORATOR COIL — Clean as required with commercial coil cleaner.
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. In winter, keep drains and traps dry.
FILTERS — Clean or replace at start of each heating and
cooling season, or more often if operating conditions require. Refer to Table 1 for type and size.
NOTE: The 48TJ028 unit requires industrial grade throwaway filters capable of withstanding face velocities up to
625 fpm. Ensure that replacement filters for the 48TJ028 units
are rated for 625 fpm.
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use throwaway filters in place of screens.
Table 13 — IGC LED Indications
ERROR CODE
Normal Operation
Hardware Failure
Fan On/Off Delay Modified
Limit Switch Fault
Flame Sense Fault
Five Consecutive Limit
Switch Faults
Ignition Lockout Fault
Inducer Switch Fault
Rollout Switch Fault
Internal Control Fault
LED INDICATION
On
Off
1 Flash
2 Flashes
3 Flashes
4 Flashes
5
6
7
8
Flashes
Flashes
Flashes
Flashes
LEGEND
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode
NOTES:
1. There is a 3-second pause between error code displays.
2. If more than one error code exists, all applicable error codes will
be displayed in numerical sequence.
3. Error codes on the IGC will be lost if power to the unit is
interrupted.
COOLING, UNITS WITH ECONOMIZER — Upon a call
for cooling, when outdoor ambient is above the changeover
control setting, the economizer damper moves to VENT
position. The compressors and evaporator and condenser fans
energize and operate as per Cooling, Units Without Economizer section on page 20.
Upon a first call for cooling, when outdoor ambient is below the changeover control setting, the evaporator fan starts
and the economizer is fully open. The compressors remain
off.
Upon a second-stage call for cooling, compressor no. 1 is
energized and mechanical cooling is integrated with economizer cooling. If the outdoor-air temperature drops below
50 F, a cooling lockout switch prevents the compressors from
running.
When supply-air temperature drops below a fixed set point,
the economizer damper modulates to maintain the temperature at the fixed set point.
Freeze protection thermostats (FPT) are located on the top
and bottom of the evaporator coil. It detects frost build-up
and locks out the compressors, allowing the coil to clear.
21
FAN SHAFT BEARINGS — For size 016 units, bearings
are permanently lubricated. No field lubrication is required.
For size 020-028 units, lubricate bearings at least every
6 months with suitable bearing grease. Extended grease line
is provided for far side fan bearing (opposite drive side). Typical lubricants are given below:
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. Conventional white oil
(Sontex 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 recharge 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 reliablity 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 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.
INDUCED DRAFT
MOTOR
COMBUSTION
FAN HOUSING
INTEGRATED GAS
UNIT CONTROLLER
(HIDDEN)
MAIN BURNER
SECTION
VIEW
PORT
FLUE BOX
COVER
MANUFACTURER
Texaco
Mobil
Sunoco
Texaco
LUBRICANT
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
CONDENSER AND EVAPORATOR-FAN MOTOR
BEARINGS — The condenser- and evaporator-fan motors
have permanently-sealed bearings, so no field lubrication is
necessary.
Evaporator Fan Performance Adjustment
(Fig. 30-32) — Fan motor pulleys are factory set for speed
CONTROL BOX
ACCESS PANEL
shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. a. Size 016 only: Loosen belt by loosening carriage nuts
holding motor mount assembly to fan scroll side plates
(A and B).
b. Size 020-028 only: Loosen nuts on the 2 carriage bolts
in the mounting base. Install jacking bolt and plate
under motor base (bolt and plate are shipped in
installer’s packet). 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. 30).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maximum speed specified in Table 1.
See Table 9 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 23).
MAIN GAS
VALVE
Fig. 28 — Typical Gas Heating Section
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.
CERAMIC
BAFFLE
CLIP
Evaporator Fan Service and Replacement
48TJ016 UNITS (See Fig. 31)
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 assembly 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 position toward evaporator coil.
8. Remove motor mounting nuts D and E (both sides).
HEAT EXCHANGER
TUBES
NOTE: One baffle and clip will be in each upper tube of the heat
exchanger.
Fig. 29 — Removing Heat Exchanger Ceramic
Baffles and Clips
22
9. Lift motor up through top of unit.
10. Reverse above procedure to reinstall motor.
11. Check and adjust belt tension as necessary.
48TJ020-028 UNITS (See Fig. 32) — The 48TJ020-028 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
securing it.
3. Loosen nuts on the 2 carriage bolts in the motor mounting 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 mounting bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-11.
Belt Tension Adjustment — To adjust belt tension:
1. Loosen fan motor bolts.
2. a. Size 016 Units:
Move motor mounting plate up or down for proper belt
tension (1⁄2 in. deflection with one finger).
Fig. 30 — Evaporator-Fan Alignment and
Adjustment
b. Size 020-028 Units:
Turn motor jacking bolt to move motor mounting plate
up or down for proper belt tension (3⁄8 in. deflection at
midspan with one finger [9 lb force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure motor
in fixed position.
Condenser-Fan Adjustment
48TJ016,020 UNITS (Fig. 33)
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.
48TJ024,028 UNITS (Fig. 34)
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.
Fig. 31 — 48TJ016 Evaporator-Fan
Motor Adjustment
23
Table 14 — Economizer Checkout Procedures
Economizer Adjustment — See Tables 14 and 15 for
checkout and enthalpy simulation. Make certain the outdoorair 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
position adjustment on the economizer motor control module. See Fig. 18.
TEST PROCEDURE
A. Disconnect power at
TR and TR1.
Disconnect jumper
between P and
P1. See Fig. 18.
B. Jumper TR to 1.
C. Jumper T1 to T.
D. Disconnect outdoor-air
thermostat connections
from SO and +.
Factory-installed
800 ohm resistor
should remain connected
to SR and +.
E. Reconnect power to
terminals TR and TR1.
RESULTS
1. LED (light-emitting diode)
should be off.
2. Motor is in closed position.
TEST PROCEDURE
Disconnect factory-installed
resistor from terminals
SR and +.
RESULTS
1 LED should be on.
2. Motor drives toward open.
Table 15 — High and Low Outdoor-Air Simulation
TEST PROCEDURE
A. Reconnect factory-installed
800 ohm resistor
between terminals
SR and +.
B. Connect 1200 ohm
checkout resistor between
terminals SO and +.
C. Turn set point potentiometer
to position A.
NOTE: A 31⁄2-in. bolt and threaded plate are included in the installer’s
packet. They should be added to the motor support channel 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.
RESULTS
Low outdoor-air test results:
1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.
Fig. 32 — 48TJ020-028 Evaporator-Fan
Motor Section
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.
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
removing 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 economizer section of the unit (see Fig. 17) to 75 F.
6. If the outdoor temperature is below 75 F, the economizer will control the mixed air with the mixed-air sensor. If the outdoor air is above 75 F, place a jumper around
the contacts of the OAT.
7. Jumper terminal T to terminal T1 on the module (see
Fig. 18). The economizer will go to the full open position. 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 positioning. If may be necessary to remove the filters to
adjust the linkage.
NOTE: Dimension is in inches.
Fig. 33 — Condenser Fan Adjustment,
48TJ016,020
NOTE: Dimension is in inches.
Fig. 34 — Condenser-Fan Adjustment,
48TJ024,028
24
9. Remove the jumper from around the contacts of the OAT
if installed in Step 6. Remove the jumper from terminals 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.
Gas Valve Adjustment
NATURAL GAS — The gas valve opens and closes in response to the thermostat or limit control.
When power is supplied to valve terminals D1 and C2,
the main valve opens to its preset position.
The regular factory setting is stamped on the valve body
(3.3 in. wg).
To adjust regulator:
1. Set thermostat at setting for no call for heat.
2. Turn main gas valve to OFF position.
3. Remove 1⁄8-in. pipe plug from manifold or gas valve pressure tap connection. Install a suitable pressure-measuring
device.
4. Set main gas valve to ON position.
5. Set thermostat at setting to call for heat.
6. Remove screw cap covering regulator adjustment screw
(See Fig. 36).
7. Turn adjustment screw clockwise to increase pressure or
counterclockwise to decrease pressure.
8. Once desired pressure is established, set thermostat setting for no call for heat, turn off main gas valve, remove
pressure-measuring device, and replace 1⁄8-in. pipe plug
and screw cap.
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.
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
contaminants.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refrigerant (refer to Table 1).
LOW CHARGE COOLING — Using cooling charging chart
(see Fig. 35), 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 temperaturesensing device is required. Charging is accomplished by ensuring the proper amount of liquid sub-cooling. 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 intersection 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 reclaim some of the
charge. Recheck suction pressure as charge is adjusted.
NOTE: Indoor-air CFM must be within normal operating range
of unit. All outdoor fans must be operating.
The TXV (thermostatic expansion valve) is set to maintain between 15 and 20 degrees of superheat at the compressors. The valves are factory set and should not require
re-adjustment.
Main Burners — For all applications, main burners are
factory set and should require no adjustment.
Fig. 36 — Gas Valve
MAIN BURNER REMOVAL
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power to unit.
3. Remove unit control box access panel, burner section
access panel, and center post (Fig. 4 and 5).
4. Disconnect gas piping from gas valve inlet.
5. Remove wires from gas valve.
6. Remove wires from rollout switch.
7. Remove sensor wire and ignitor cable from IGC board.
8. Remove 2 screws securing manifold bracket to basepan.
9. Remove 2 screws that hold the burner support plate flange
to the vestibule plate.
10. Lift burner assembly out of unit.
CLEANING AND ADJUSTMENT
1. Remove burner rack from unit as described in Main Burner
Removal section above.
2. Inspect burners, and if dirty, remove burners from rack.
3. Using a soft brush, clean burners and crossover port as
required.
4. Adjust spark gap. See Fig. 37.
5. Reinstall burners on rack.
6. Reinstall burner rack as described above.
LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)
BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING
140
120
ADD CHARGE IF ABOVE CURVE
100
80
REDUCE CHARGE IF BELOW CURVE
60
40
50
150
100
200
250
350
300
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
400
Fig. 35 — Cooling Charging Chart
25
Filter Drier — Replace whenever refrigerant system is
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 activates, that refrigerant circuit will be automatically locked
out by the CLO. To reset, manually move the thermostat
setting.
FREEZE PROTECTION THERMOSTAT (FPT) — An FPT
is located on the top and bottom of the evaporator coil. They
detect frost build-up and turn off the compressor, allowing
the coil to clear. Once the frost has melted, the compressor
can be reenergized by resetting the compressor lockout.
exposed to atmosphere.
Protective Devices
COMPRESSOR PROTECTION
Overcurrent — Each compressor has internal line break motor protection, except the circuit no. 1 on the 48TJ028 units.
Compressor no. 1 on the 48TJ028 unit uses an electronic
module, located with the compressor junction box, to provide motor protection. This electronic module monitors winding and discharge temperatures. If these temperatures reach
the trip values, the module interrupts the control line and
causes the compressor to switch off.
Crankcase Heater — Only the 48TJ028 unit is equipped with
a 70-watt crankcase heater to prevent absorption of liquid
refrigerant by oil in the crankcase when the compressor is
idle. The crankcase heater is energized whenever there is main
power to the unit and the compressor is not energized.
Relief Devices — All units have relief devices to protect against damage from excessive pressures (i.e., fire). These
devices protect the high and low side.
Control Circuit, 24-V — This control circuit is protected against overcurrent by a 3.2 amp circuit breaker. Breaker
can be reset. If it trips, determine cause of trouble before
resetting.
IMPORTANT: After prolonged shutdown or servicing, energize the crankcase heaters for 24 hours before
starting the compressors.
Overtemperature — Each compressor has an internal protector to protect it against excessively high discharge gas
temperatures.
Replacement Parts — A complete list of replacement
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 cooling lockout (CLO) will lock the
compressors off. To reset, manually move the thermostat
setting.
EVAPORATOR FAN MOTOR PROTECTION — A manual
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.
Diagnostic LEDs — The IGC control board has a LED
parts may be obtained from any Carrier distributor upon
request.
for diagnostic purposes. The IGC error codes are shown in
Table 13.
26
SEE
DETAIL
"C"
48TJD016
SEE
DETAIL
"C"
48TJD020-028 AND 48TJF016
SEE
DETAIL
"C"
48TJF020-028
Fig. 37 — Spark Gas Adjustment
27
LEGEND
Fig. 38 — Typical Wiring Schematic and Fig. 39 — Typical Component Arrangement
AHA
BKR W/AT
BR
C
CB
CC
CH
CLO
CLS
COMP
CR
CT
DM
DU
EQUIP
FPT
FU
GND
GVR
HPS
HS
HV
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Adjustable Heat Anticipator
Breaks with Amp Turns
Burner Relay
Contactor, Compressor
Circuit Breaker
Cooling Compensator
Crankcase Heater
Compressor Lockout
Compressor Lockout Switch
Compressor Motor
Control Relay
Current Transformer
Damper Motor
Dummy Terminal
Equipment
Freeze Protection Thermostat
Fuse
Ground
Gas Valve Relay
High-Pressure Switch
Hall Effect Sensor
High Voltage
IDM
IFC
IFCB
IFM
IGC
L
LED
LOR
LPS
LS
MAT
MGV
NEC
OAT
OFC
OFM
PL
R
RS
SN
SW
TB
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Induced-Draft Motor
Indoor (Evaporator) Fan Contactor
Indoor (Evaporator) Fan Circuit Breaker
Indoor (Evaporator) Fan Motor
Integrated Gas Unit Controller
Light
Light-Emitting Diode
Lockout Relay
Low-Pressure Switch
Limit Switch
Mixed-Air Thermostat
Main Gas Valve
National Electrical Code
Outdoor-Air Thermostat
Outdoor (Condenser) Fan Contactor
Outdoor (Condenser) Fan Motor
Plug Assembly
Relay
Rollout Switch
Sensor
Switch
Terminal Block
TRAN — Transformer
Terminal (Marked)
NOTES:
1. Compressor and fan motors 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. Jumpers are omitted when unit is equipped with economizer.
4. IFCB must trip amps is equal to or less than 140% full load amps.
5. On 208/230-v unit, TRAN1 is factory wired to ORN lead for 230-v power supply.
If unit is to run on 208-v power supply, TRAN1 must be rewired. Disconnect the
BLK wire on TRAN1 and connect wire to 208-v RED wire. Insulate 230-v ORN
wire.
6. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices. Before replacing CLO, check these devices.
7. Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single-pole, double-throw contact. An underlined number signifies a normally-closed contact. A plain (no line) number signifies a normallyopen contact.
28
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Splice (Field Supplied)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional
Wiring
To Indicate Common
Potential Only, Not
To Represent Wiring
Fig. 38 — Typical Wiring Schematic (48TJ024, 208/230-V Shown)
29
FROM SHEET 1
WIRING DIAGRAM
FROM SHEET 1
WIRE DIAGRAM
Fig. 38 — Typical Wiring Schematic (48TJ024, 208/230-V Shown) (cont)
30
Fig. 39 — Typical Component Arrangement (48TJ024 Shown)
31
TROUBLESHOOTING
Refer to Tables 16 and 17 for troubleshooting details.
Table 16 — Cooling Service Analysis
PROBLEM
Compressor and
condenser fan
will not start.
Compressor will not start
but condenser fan runs.
Compressor cycles
(other than normally
satisfying thermostat).
Compressor operates
continuously.
Excessive head pressure.
Head pressure too low.
Excessive suction
pressure.
Suction pressure too low.
CAUSE
Power failure.
Fuse blown or circuit breaker tripped.
Defective thermostat, contactor, transformer, or control
relay.
Insufficient line voltage.
Incorrect or faulty wiring.
Thermostat setting too high.
Faulty wiring or loose connections in compressor circuit.
Compressor motor burned out, seized, or internal
overload open.
Defective overload.
Compressor locked out
One leg of 3-phase power dead.
Refrigerant overcharge or undercharge.
Defective compressor.
Insufficient line voltage.
Blocked condenser.
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.
Condenser coil dirty or restricted.
Dirty air filter.
Dirty condenser coil.
Refrigerant overcharged.
Faulty TXV.
Air in system.
Condenser air restricted or air short-cycling.
Low refrigerant charge.
Restriction in liquid tube.
High heat load.
Faulty TXV.
Refrigerant overcharged.
Dirty air filter.
Low refrigerant charge.
Metering device or low side restricted.
Faulty TXV.
Insufficient evaporator airflow.
Compressor no. 2
will not run.
Temperature too low in conditioned area.
Field-installed filter drier restricted.
Unit in economizer mode.
LEGEND
TXV — Thermostatic Expansion Valve
32
REMEDY
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
Determine cause for safety trip and reset lockout.
Replace fuse or reset circuit breaker.
Determine cause.
Recover refrigerant, evacuate system, and recharge
to nameplate.
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.
Clean coil.
Recover excess refrigerant.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover refrigerant, evacuate system, and recharge.
Determine cause and correct.
Check for leaks, repair, and recharge.
Remove restriction.
Check for source and eliminate.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
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.
Increase air quantity. Check filter and replace if
necessary.
Reset thermostat.
Replace.
Proper operation; no remedy necessary.
Table 17 — Heating Service Analysis
PROBLEM
Burners will not
ignite.
CAUSE
Misaligned spark electrodes.
No gas at main burners.
Water in gas line.
No power to furnace.
No 24 v power supply to control circuit.
Inadequate heating.
Miswired or loose connections.
Burned-out heat anticipator in thermostat.
Broken thermostat wires.
Dirty air filter.
Gas input to unit too low.
Unit undersized for application.
Restricted airflow.
Blower speed too low.
Limit switch cycles main burners.
Too much outdoor air.
Poor flame
characteristics.
Incomplete combustion (lack of combustion air)
results in:
Aldehyde odors, CO, sooting flame, or floating flame.
Burners will not
turn off.
Unit is locked into Heating mode for a one minute
minimum.
LEGEND
GR — Ground
33
REMEDY
Check flame ignition and sensor electrode positioning.
Adjust as needed.
Check gas line for air; purge as necessary. After purging
gas line of air, allow gas to dissipate for at least 5 minutes before attempting to relight unit.
Check gas valve.
Drain water and install drip leg to trap water.
Check power supply, fuses, wiring, and circuit breaker.
Check transformer. Transformers with internal overcurrent protection require a cool-down period before
resetting. Check 24-v circuit breaker; reset if necessary.
Check all wiring and wire nut connections.
Replace thermostat.
Run continuity check. Replace wires if necessary.
Clean or replace filter as necessary.
Check gas pressure at manifold. Clock gas meter for
input. If too low, increase manifold pressure or replace
with correct orifices.
Replace with proper unit or add additional unit.
Clean filter, replace filter, or remove any restrictions.
Install alternate motor, if applicable, or adjust pulley to
increase fan speed.
Check rotation of blower, thermostat heat anticipator settings, and temperature rise of unit. Adjust as needed.
Adjust minimum position.
Check economizer operation.
Check all screws around flue outlets and burner compartment. Tighten as necessary.
Cracked heat exchanger.
Overfired unit — reduce input, change orifices, or adjust
gas line or manifold pressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Wait until mandatory one minute time period has
elapsed or power to unit.
Refer to Fig. 38 for IGC troubleshooting information.
LEGEND
IGC — Integrated Gas Unit Controller
NOTE: Thermostat Fan Switch in the ‘‘AUTO’’
position.
Fig. 38 — IGC Control (Heating and Cooling)
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
PC 111
Catalog No. 534-711
Printed in U.S.A.
Form 48TJ-14SI
Pg 34
10-98
Replaces: 48TJ-8SI
Tab 1a
MODEL NO.:
SERIAL NO.:
DATE:
TECHNICIAN:
PRE-START-UP:
M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
M VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT AND PLATE (48TJ020-028 ONLY)
M OPEN ALL SERVICE VALVES (SUCTION, DISCHARGE, AND LIQUID)
M VERIFY INSTALLATION OF ECONOMIZER HOOD
M VERIFY INSTALLATION OF EXHAUST HOOD
M VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
M VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
M CHECK GAS PIPING FOR LEAKS
M CHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE
M VERIFY THAT UNIT IS LEVEL
M CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW
IS TIGHT
M VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED
M VERITY THAT SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION
START-UP
ELECTRICAL
SUPPLY VOLTAGE
L1-L2
L2-L3
L3-L1
COMPRESSOR AMPS — COMPRESSOR NO. 1
L1
L2
L3
— COMPRESSOR NO. 2
L1
L2
L3
SUPPLY FAN AMPS
EXHAUST FAN AMPS
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
F DB (Dry Bulb)
RETURN-AIR TEMPERATURE
F DB
COOLING SUPPLY AIR
F
GAS HEAT SUPPLY AIR
F
F
WB (Wet Bulb)
PRESSURES
GAS INLET PRESSURE
IN. WG
GAS MANIFOLD PRESSURE
STAGE NO. 1
IN. WG
STAGE NO. 2
REFRIGERANT SUCTION
CIRCUIT NO. 1
PSIG
CIRCUIT NO. 2
(SIZES 020-028 ONLY)
PSIG
REFRIGERANT DISCHARGE
CIRCUIT NO. 1
PSIG
CIRCUIT NO. 2
(SIZES 020-028 ONLY)
PSIG
IN. WG
M VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 25.
GENERAL
M ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
PC 111
Catalog No. 534-711
Printed in U.S.A.
Form 48TJ-14SI
Pg CL-1
10-98
Replaces: 48TJ-8SI
Tab 1a
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - CUT ALONG DOTTED LINE
CUT ALONG DOTTED LINE
START-UP CHECKLIST
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