Carrier Single Package Rooftop Units Electric Cooling Gas Heating 48Hj015 025 Users Manual

48HJ015-025 to the manual 88791006-9120-4aeb-863e-83f5c7ef6fb1

2015-01-24

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48HJ015-025
Single Package Rooftop Units
Electric Cooling/Gas Heating

Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
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 . . . . . . . . . . . . 7
Step 4 — Make Unit Duct Connections . . . . . . . . 7
Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . 7
Step 6 — Trap Condensate Drain . . . . . . . . . . . . . 8
Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . . . 8
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 FACTORY-INSTALLED
ECONOMIZER
Step 10 — Install Outdoor-Air Hood . . . . . . . . . . 10
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-27
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).

INSTALLATION
Step 1 — Provide Unit Support
ROOF CURB — Assemble or install accessory 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
before unit is set in place. 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 Installation Instructions for additional information as required. When accessory roof curb is
used, unit may be installed on class A, B, or C roof covering
material.
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasket with
the roof curb as shown in Fig. 1. Improperly applied
gasket can also result in air leaks and poor unit
performance.
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. 534-807
Printed in U.S.A.
Form 48HJ-9SI
Pg 1
2-95
Replaces: 48HJ-5SI
Tab 1a

ACCESSORY
CURB
DESCRIPTION
‘‘A’’
‘‘B’’
‘‘C’’
PACKAGE NO. HEIGHT
18-29
Standard
Curb
—
50PQ900221
—
—
—
(305)
149 High
Standard Curb
28-09
50PQ900141
Units Requiring
—
—
—
(610) for
High Installation
28-09
Horizontal Supply 58-69 08-21⁄29 18-69
50PQ900151
(610)
and Return Curb (1676) (64)
(457)
Pre-Assembled,
1
18-119
68-29 08-6 ⁄49 18-25⁄89
50DP900211
High-Static,
(584)
(1880)
(159) (371)
Horizontal Adapter
LEGEND
COMP SECT. — Compressor Section
NOTES:
1. Roof curb accessory is shipped unassembled.
2. Insulated panels, 1⁄2-in. thick neoprene-coated, 2 lb density.
3. Dimensions in ( ) are in millimeters.
4.

NOTE: To prevent the hazard of stagnant water build-up in the drain
pan of the indoor-air section, unit can only be pitched as shown.

Direction of airflow.

5. Roof curb: 18 gage steel.
6. Attach all ductwork to roof curb.
7. Field installation of sidewall is mandatory.

Fig. 1 — Roof Curb and Horizontal Adapter Details

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 weight is shown in Table 1.
Instructions continued on page 7.

Fig. 2 — Horizontal Supply/Return Curb
and Horizontal Adapter Details
ALTERNATE UNIT SUPPORT — When the curb 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.

Step 2 — Rig and Place Unit — Inspect unit for transportation damage. File any claim with transportation agency.

UNIT
48HJ
D015
E015
E017
D025

MAXIMUM SHIPPING
WEIGHT
Lb
Kg
1920
871
1940
880
2310
1048
2535
1150

Dimension A
UNIT
48HJD015
48HJE015
48HJE017
48HJD025

Ft-in.
3-13⁄8
3-11⁄4
3-43⁄4
3-43⁄4

mm
949
946
1035
1010

NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Table 1 for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner
post from packaging to protect coil from damage. Use bumper boards
for spreader bars.
5. Weights do not include optional economizer. See Table 1 for economizer weight.
6. Weights given are for aluminum evaporator coil plate fins and copper condenser coil plate fins. Weights of other metal combinations
are listed in Table 1.

All panels must be in place when rigging.

Fig. 3 — Rigging Details

Table 1 — Physical Data
UNIT SIZE 48
OPERATING WT (lb)
Al/Al*
Unit Al/Cu*
Cu/Cu*
Economizer
Roof Curb†
COMPRESSOR
Number
Cylinders
REFRIGERANT TYPE
Charge (lb)
System 1
System 2
CONDENSER COIL
Rows
Fins/in.
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Number...Diameter (in.)
Motor Hp (1075 Rpm)
Watts Input (Total)
EVAPORATOR COIL
Rows
Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Nominal Cfm
Fan Rpm Range
Maximum Allowable Rpm
Motor Pulley Pitch Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Belt, Quantity...Type...Length (in.)
Factory Speed Setting (Rpm)
Motor Hp (Service Factor)
Motor Frame Size
FURNACE SECTION
Rollout Switch Cutout Temp (F)**
Burner Orifice Diameter (in. ...drill size)
Natural Gas
Pilot Orifice Diameter (Quantity) in. ...drill size
Natural Gas
Thermostat Heat Anticipator Setting
Stage 1
Stage 2
Gas Valve Quantity
HIGH-PRESSURE SWITCH
Cutout (psig)
Reset (psig)
LOW-PRESSURE SWITCH
Cutout (psig)
Reset (psig)
AIR INLET SCREENS
Economizer, Quantity...Size (in.)

HJD015/HJE015
208/230, 460 V
575 V
1640/1660
1770/1790
1840/1860
110
200
1
6

2...10 x 10
5000
1194-1526
1550
3.4/4.4
5.2
1...AX...42
1293
3.7 (1.15)
56H

HJE017

2010
2160
2250
110
200
06D Semi-Hermetic
2
4
R-22

22.50
14.25
—
15.00
Copper Tubes, Aluminum or Copper Plate Fins
3
4
15
15
22.2
22.2
Propeller Type, Direct Drive
10,500
10,500
3...22
3...22
1⁄2
1⁄2
1090
1090
Copper Tubes, Aluminum or Copper Plate Fins
2
3
17
15
17.9
17.9
Centrifugal, Adjustable Pitch Belt Drive
2...10 x 10
2...12 x 12
5000
6000
1201-1462
1238-1494
1550
1550
4.3/5.3
5.4/6.6
6.4
7.9
1...B...45
1...BX...50
1279
1366
3 (1.15)
5 (1.15)
56H
184T

LEGEND

2
6
17.50
17.00
4
15
22.2
14,200
2...30
1...1075
3400
4
15
17.9
2...12 x12
8000
1323-1579
1550
5.8/7.0
7.9
1...BX...51
1451
10 (1.15)
215T

190
.113...33

(1) .055...54/
(1) .055...54
(1) .041...59

(1) .055...54
(1) .041...59

1.2/1.2
—/0.6
1/2

1.2
0.6
2

7
22
Cleanable
2...20 x 25 x 1
1...20 x 20 x 1
10% Efficient — 2-in. Throwaway Fiberglass
4...20 x 20 x 2
4...16 x 20 x 2

Al — Aluminum
Cu — Copper
*Evaporator coil fin material/condenser coil fin material.
†Weight of 14 in. roof curb.
**Rollout switch is manual reset.

2235
2385
2515
110
200

190
.113...33

426
320

RETURN-AIR FILTERS (TYPE)
Quantity... Size (in.)

HJD025

MAXIMUM SHIPPING WEIGHT
Lb
Kg
1920
871
1940
880
2310
1048

UNIT
48HJ
D015
E015
E017

A
Lb
365
372
509

Kg
166
169
231

DIMENSIONS
X

Ft-in.
3-2
3-2
3-73⁄8

WEIGHT OF
B
Lb
Kg
360
163
363
165
506
230

mm
965
965
1102

Ft-in.
4-0
4-0
3-65⁄8

CORNER*
C
Lb
Kg
373
169
377
171
475
216

mm
1219
1219
1083

D
Lb
540
547
519

Kg
245
248
235

*Weights are for unit only and do not include options or crating.
NOTES:
1. Dimensions in ( ) are in millimeters.
2.
Center of gravity.
3.

Direction of airflow.

4. Ductwork to be attached to accessory roof curb only.
5. Minimum clearance:
a. Rear: 78-09 (2134) for coil removal. This dimension can be reduced
to 48-09 (1219) if conditions permit coil removal from the top.
b. Left side: 48-09 (1219) for proper condenser coil airflow.
c. Front: 48-09 (1219) for control box access.
d. Right side: 48-09 (1219) for proper operation of damper and power
exhaust (if so equipped).
e. Top: 68-09 (1829) to assure proper condenser fan operation.
f. Local codes or jurisdiction may prevail.
6. With the exception of clearance for the condenser coil and the damper/
power exhaust as stated in Note No. 5, a removable fence or barricade requires no clearance.
7. Dimensions are from outside of corner post. Allow 08-5⁄169 (8) on each
side for top cover drip edge.

Fig. 4 — Base Unit Dimensions, 48HJ015,017

MAXIMUM SHIPPING WEIGHT
Lb
Kg
2535
1150

NOTES:
1. Dimensions in (
2.

) are in millimeters.

Center of gravity.

Direction of airflow.

4. Ductwork to be attached to accessory roof curb only.
5. Minimum clearance:
a. Rear: 7809 (2134) for coil removal. This dimension can be reduced to 4809 (1219) if conditions
permit coil removal from the top.
b. 4809 (1219) to combustible surfaces, all four sides
(includes between units).
c. Left side: 4809 (1219) for proper condenser coil
airflow.
d. Front: 4809 (1219) for control box access.
e. Right side: 4809 (1219) for proper operation of
damper and power exhaust (if so equipped).
f. Top: 6809 (1829) to assure proper condenser fan
operation.
g. Bottom: 149 (356) to combustible surfaces (when
not using curb).
h. Control box side: 3809 (914) to ungrounded surfaces (non-combustible).
i. Control box side: 3869 (1067) to block or concrete
walls, or other grounded surfaces.
j. Local codes or jurisdiction may prevail.
6. With the exception of clearance for the condenser
coil and the damper/power exhaust as stated in Note
No. 5, a removable fence or barricade requires no
clearance.
7. Dimensions are from outside of corner post. Allow
08-5⁄169 (8) on each side for top cover drip edge.

A
Lb
523

Kg
237

CORNER WEIGHT*
B
C
Lb
Kg
Lb
Kg
541
245
574
260

D
Lb
596

*Weights are for unit only and do not include options or crating.

Fig. 5 — Base Unit Dimensions, 48HJ025

Kg
270

Step 3 — Field Fabricate Ductwork — Secure all

Step 5 — Install Flue Hood — Flue hood is shipped

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.

secured to a baffle under main control box. To install, secure
flue hood to access panel. See Fig. 9.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 10.

Step 4 — Make Unit Duct Connections — Unit
is shipped for through-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.
areas indicate block-off pans.

Fig. 8 — Concentric Duct Details

NOTE: Do not drill in this area; damage to basepan may result in
water leak.

Fig. 6 — Air Distribution — Through-the-Bottom
(48HJ017 and 025 Shown)

NOTE: Do not drill in this area; damage to basepan may result in
water leak.

Fig. 7 — Concentric Duct Air Distribution
(48HJ017 and 025 Shown)

Fig. 9 — Flue Hood Location

PRESSURE
SWITCH

COMBUSTION
FAN HOUSING

3/4" FPT DRAIN
CONNECTION

1-3/8"
DRAIN HOLE

Fig. 11 — Condensate Drain Details

HEAT
EXCHANGER
SECTION

Fig. 10 — Combustion Fan Housing Location

Fig. 12 — Condensate Drain Piping Details

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.

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 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.

Fig. 13 — Field Gas Piping

Natural gas pressure at unit gas connection must not be
less than 5 in. wg or greater than 13.5 in. wg.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas connection (3⁄4-in. NPT).

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.
LEGEND
EQUIP — Equipment
GND
— Ground
NEC
— National Electrical Code
TB
— Terminal Board
NOTE: Maximum wire size for TB1 is 2/0.

The unit must be electrically grounded in accordance
with local codes and NEC ANSI/NFPA 70 (National Fire
Protection Association).
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.

Fig. 14 — Field Power Wiring Connections
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%.

Table 2 — Electrical Data
COMPRESSOR
NOMINAL VOLTAGE
OFM
UNIT VOLTAGE RANGE
No. 1
No. 2
48HJ
(3 Ph,
LRA
Min Max RLA LRA RLA LRA Qty FLA
60 Hz)
(ea) (ea) Hp

FLA

LRA

208/230

187

254 39.7 228

—

1.7

3.8 3.7 10.5/10.5 84.5/84.5

460

414

508 19.9 114

—

0.8

1.9 3.7

575

518

632 16.0

—

0.75 1.5

208/230

187

254 28.2 160 28.2 160

460

414

508 14.1

14.1

575

518

632 11.3

11.3

208/230

015

017

025

FLA
HACR
IFM
LRA
MCA
MOCP
NEC
OFM
RLA

IFM

—
—
—
—
—
—
—
—
—

4.8

42.3

3.9

23.4

1.7 24.8

15.8/15.8

105/91

0.8 10.8

7.9

0.75 8.4

6.0

187

254 35.6 198 35.6 198

5.5 24.8 10 28.0/28.0 193/168

460

414

508 17.8

17.8

2.8 10.8 10

14.6

575

518

632 14.3

14.3

3.4

13.0

8.4

POWER COMBUSTION
EXHAUST FAN MOTOR POWER SUPPLY

DISCONNECT
SIZE

FLA LRA

FLA

MCA

FLA

—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1

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

65/65
70/70
32
34
26
28
84/84
89/89
42
44
34
36
119/119
124/124
60
63
52
54

—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8

MOCP*

LRA

100/100 64/64 324/324
100/100 70/70 343/343
50
32
162
50
34
168
40
26
119
40
29
124
110/100 90/90 499/485
110/110 95/95 518/504
50
45
238
50
47
244
40
36
190
45
39
195
150/150 127/127 639/614
150/150 133/133 657/632
70
65
304
80
67
310
60
56
241
60
59
246

NOTES: 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. The Canadian units
may be fuse or circuit breaker.

LEGEND
Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps

*This is the maximum size permissible; smaller fuse size may be used where
conditions permit.

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 FACTORY-INSTALLED 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.
NOTE: Refer to accessory installation instructions included
with the field-installed economizer for installation information. Also see Accessory Field-Installed Economizer Adjustment section on page 12.

Use the following formula to determine the percent voltage imbalance.
% Voltage Imbalance:
max voltage deviation from average voltage
= 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB =452 v
BC =464 v
AC =455 v
452 +464 +455
3
1371
=
3
= 457
Determine maximum deviation from average voltage:
(AB) 457 −452 =5 v
(BC) 464 −457 =7 v
(AC) 457 −455 =2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance:
7
% Voltage Imbalance =100 x
457
=1.53%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
Average Voltage =

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 cover, upper and lower filter retainers, hood drain pan, baffle (017 and 025 only), 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 cover, side panels, upper filter retainer, and drain pan (see Fig. 22).
3. Secure lower filter retainer and long portion of support
bracket to unit. See Fig. 22. Leave screws loose on 017
and 025 units.
4. 48HJ017,025 Units Only: Slide baffle behind lower filter
retainer and tighten screws.

IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local electric utility company immediately.
Unit failure as a result of operation on improper line
voltage or excessive phase imbalance constitutes abuse and
may cause damage to electrical components.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to 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).
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:
UNIT
48HJD015
48HJD025, HJE015,
HJE017

VOLTAGE UNIT
All

W1
1.20

W2
—

All

1.20

0.60

Fig. 15 — Field Control Thermostat Wiring

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.

Fig. 16 — 25% Outdoor-Air Section Details
10

5. Loosen sheet metal screws for top cover of base unit
located above outdoor-air inlet opening.
6. Match notches in hood top cover with unit top cover screws.
Insert hood flange between top cover flange and unit. Tighten
screws.
7. Insert outdoor-air inlet screens and spacer in channel
created by lower filter retainer and filter support bracket.
8. Attach remaining shorter section of filter support bracket.

Fig. 19 — Economizer Motor Control
Module Location

Fig. 17 — Economizer Damper Assembly — End View

Fig. 20 — Outdoor-Air Hood Component Location

LED — Light-Emitting Diode

Fig. 18 — Economizer Motor Control Module
Fig. 21 — Seal Strip Location

Crankcase Heater — Crankcase heater is energized
as long as there is power to the unit.
IMPORTANT: Unit power must be on for 24 hours
prior to start-up. Otherwise, damage to compressor may
result.

Evaporator Fan — Fan belt and pulleys are factory installed. See Tables 3A, 3B, 4, and 5 for Fan Performance
Data. Remove tape from fan pulley and adjust pulleys on
48HJ015 units as required. See Evaporator-Fan Performance Adjustment section on page 19. Be sure that fans rotate in the proper direction. See Table 6 for air quantity limits. See Table 7 for static pressure drops for accessories and
options. See Fig. 23 and 24 for fan performance using horizontal adapter and power exhaust. To alter fan performance,
see Performance Adjustment sections on page 19.

Fig. 22 — Outdoor-Air Hood Details

START-UP

Condenser-Fans and Motors — Condenser fans and

Use the following information and Start-Up Checklist
on page CL-1 to check out unit PRIOR to start-up.

motors are factory set. Refer to Condenser-Fan Adjustment
section on page 20 as required. Be sure that fans rotate in the
proper direction.

Unit Preparation — Check that unit has been installed
in accordance with these installation instructions and applicable codes.

Return-Air Filters — Check that correct filters are installed in filter tracks (see Table 1). Do not operate unit without return-air filters.

Compressor Mounting — Loosen the compressor holddown bolts until sidewise movement of the washer under
each holddown bolt head can be obtained. Do not loosen
completely as bolts are self-locking and will maintain
adjustment.

Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
Accessory Field-Installed Economizer Adjustment — Remove filter access panel. Check that outdoor-

Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.

air damper is closed and return-air damper is open.
Economizer operation and adjustment are described in
Base Unit Operation section on page 17; and Economizer
Adjustment section on page 20.

Refrigerant Service Ports and Valves — Each 48HJ
unit has 2 Schrader-type service ports per circuit; one on the
suction line and one on the liquid line. Be sure that the caps
on the ports are tight. The units also have 2 service valves
per circuit; one on the suction line and one on the discharge
line. Be sure all valves are open.

NOTE: The 50DP900211 horizontal supply/return adapter accessory
improves 48HJ fan performance by increasing external static pressure by amount shown above.

NOTES:
1. Dimensions are in millimeters.
2. The 50DP900211 high static regain adapter accessory may be used
to provide horizontal supply/return.

Fig. 23 — Horizontal Supply/Return Fan Performance
With 50DP900211 High Static Regain Adapter

Table 3A — Fan Performance Data, 48HJ015, 208/230, 460-V Units
AIRFLOW
(CFM)
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000
6250

AIRFLOW
(CFM)
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000
6250

Rpm

0.2
Watts

Bhp

Rpm

0.4
Watts

741
773
806
839
873
908
942
978
1013
1049
1085

510
647
796
958
1134
1323
1527
1745
1978
2227
2491

0.58
0.74
0.91
1.09
1.29
1.51
1.74
1.99
2.25
2.54
2.84

854
882
912
942
972
1003
1035
1067
1099
1132
1166

715
859
1015
1183
1365
1560
1769
1992
2230
2483
2751

Rpm

1.2
Watts

Bhp

Rpm

1.4
Watts

1203
1222
1242
1264
1286
1310
1335
1360
1386
1413
1440

1562
1724
1900
2089
2290
2507
2737
2981
3241
3514
3803

1.78
1.96
2.16
2.38
2.61
2.86
3.12
3.40
3.69
4.00
4.33

1277
1294
1313
1333
1354
1376
1399
1423
1448
1474
1500

1784
1950
2129
2322
2528
2748
2983
3231
3495
3773
4066

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts

Bhp

Rpm

1.0
Watts

Bhp

1130
1285
1452
1632
1825
2032
2252
2487
2736
2999
3279

1.29
1.46
1.65
1.86
2.08
2.32
2.57
2.83
3.12
3.42
3.74

1124
1145
1167
1191
1215
1241
1267
1293
1321
1349
1378

1344
1502
1674
1859
2056
2268
2494
2733
2988
3257
3541

1.53
1.71
1.91
2.12
2.34
2.58
2.84
3.11
3.40
3.71
4.03

EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts

Bhp

Rpm

2.0
Watts

Bhp

2.55
2.75
2.96
3.19
3.43
3.69
3.97
4.26
—
—
—

1483
1495
1509
1525
1542
1560
—
—
—
—
—

2473
2650
2839
3042
3259
3489
—
—
—
—
—

2.82
3.02
3.23
3.47
3.71
3.98
—
—
—
—
—

0.82
0.98
1.16
1.35
1.56
1.78
2.02
2.27
2.54
2.83
3.13

2.03
2.22
2.43
2.65
2.88
3.13
3.40
3.68
3.98
4.30
4.63

952
978
1004
1032
1060
1089
1118
1148
1179
1210
1241

1349
1364
1381
1399
1419
1440
1461
1484
1508
1532
1558

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates standard operating range.

921
1071
1233
1407
1595
1796
2011
2240
2484
2742
3015

2010
2180
2362
2558
2769
2992
3230
3483
3750
4032
4330

1.05
1.22
1.40
1.60
1.82
2.05
2.29
2.55
2.83
3.12
3.44

2.29
2.48
2.69
2.91
3.15
3.41
3.68
3.97
4.27
4.59
4.93

1041
1064
1089
1114
1140
1167
1195
1223
1252
1282
1312

1417
1431
1446
1463
1482
1501
1522
1543
—
—
—

2240
2413
2599
2799
3012
3240
3481
3737
—
—
—

5. Static pressure losses (i.e., economizer) must be added to external static pressure before entering Fan Performance table. See
Table 7 for accessory/FIOP static pressure information.
6. Interpolation is permissible. Do not extrapolate.
7. Maximum continuous bhp is 4.25 and the maximum continuous
watts are 3775. Extensive motor and drive testing on these units
ensures that the full horsepower range of the motor can be utilized with confidence. Using your fan motors up to the watts rating
shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

2.
indicates field-supplied motor and drive required.
3. All other numbers indicate field-supplied drive required.
4. Factory shipped motor drive range is 1194 to 1526 rpm. Other rpms
require a field-supplied drive.

Table 3B — Fan Performance Data, 48HJ015, 575-V Units
AIRFLOW
(CFM)
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000
6250

AIRFLOW
(CFM)
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000
6250

Rpm

0.2
Watts

Bhp

Rpm

0.4
Watts

741
773
806
839
873
908
942
978
1013
1049
1085

510
647
796
958
1134
1323
1527
1745
1978
2227
2491

0.58
0.74
0.91
1.09
1.29
1.51
1.74
1.99
2.25
2.54
2.84

854
882
912
942
972
1003
1035
1067
1099
1132
1166

715
859
1015
1183
1365
1560
1769
1992
2230
2483
2751

Rpm

1.2
Watts

Bhp

Rpm

1.4
Watts

1203
1222
1242
1264
1286
1310
1335
1360
1386
1413
1440

1562
1724
1900
2089
2290
2507
2737
2981
3241
3514
3803

1.78
1.96
2.16
2.38
2.61
2.86
3.12
3.40
3.69
4.00
4.33

1277
1294
1313
1333
1354
1376
1399
1423
1448
1474
1500

1784
1950
2129
2322
2528
2748
2983
3231
3495
3773
4066

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts

Bhp

Rpm

1.0
Watts

Bhp

1030
1285
1452
1632
1825
2032
2252
2487
2736
2999
3279

1.29
1.46
1.65
1.86
2.08
2.32
2.57
2.83
3.12
3.42
3.74

1124
1145
1167
1191
1215
1241
1267
1293
1321
1349
1378

1344
1502
1674
1859
2056
2268
2494
2733
2988
3257
3541

1.53
1.71
1.91
2.12
2.34
2.58
2.84
3.11
3.40
3.71
4.03

EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts

Bhp

Rpm

2.0
Watts

Bhp

2.55
2.75
2.96
3.19
3.43
3.69
3.97
4.26
—
—
—

1483
1495
1509
1525
1542
1560
—
—
—
—
—

2473
2650
2839
3042
3259
3489
—
—
—
—
—

2.82
3.02
3.23
3.47
3.71
3.98
—
—
—
—
—

0.82
0.98
1.16
1.35
1.56
1.78
2.02
2.27
2.54
2.83
3.13

2.03
2.22
2.43
2.65
2.88
3.13
3.40
3.68
3.98
4.30
4.63

952
978
1004
1032
1060
1089
1118
1148
1179
1210
1241

1349
1364
1381
1399
1419
1440
1461
1484
1508
1532
1558

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates standard operating range.

921
1071
1233
1407
1595
1796
2011
2240
2484
2742
3015

2010
2180
2362
2558
2769
2992
3230
3483
3750
4032
4330

1.05
1.22
1.40
1.60
1.82
2.05
2.29
2.55
2.83
3.12
3.44

2.29
2.48
2.69
2.91
3.15
3.41
3.68
3.97
4.27
4.59
4.93

1041
1064
1089
1114
1140
1167
1195
1223
1252
1282
1312

1417
1431
1446
1463
1482
1501
1522
1543
—
—
—

2240
2413
2599
2799
3012
3240
3481
3737
—
—
—

5. Static pressure losses (i.e., economizer) must be added to external static pressure before entering Fan Performance table. See
Table 7 for accessory/FIOP static pressure information.
6. Interpolation is permissible. Do not extrapolate.
7. Maximum continuous bhp is 3.45 and the maximum continuous
watts are 3065. Extensive motor and drive testing on these units
ensures that the full horsepower range of the motor can be utilized with confidence. Using your fan motors up to the watts rating
shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

2.
indicates field-supplied motor and drive required.
3. All other numbers indicate field-supplied drive required.
4. Factory shipped motor drive range is 1201 to 1462 rpm. Other rpms
require a field-supplied drive.

Table 4 — Fan Performance Data, 48HJ017 Units
AIRFLOW
(CFM)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500

AIRFLOW
(CFM)
4500
4800
5100
5400
5700
6000
6300
6400
6900
7200
7500

Rpm

0.2
Watts

Bhp

Rpm

0.4
Watts

630
659
688
717
748
776
804
835
863
892
923

805
943
1094
1262
1450
1648
1861
2103
2356
2628
2933

0.9
1.1
1.2
1.4
1.6
1.8
2.1
2.4
2.6
2.9
3.3

741
765
789
814
842
867
892
919
946
972
1001

1059
1208
1371
1550
1752
1963
2190
2445
2712
2998
3318

Rpm

1.2
Watts

Bhp

Rpm

1.4
Watts

1128
1138
1148
1160
1175
1188
1203
1221
1238
1256
1278

2355
2533
2722
2928
3158
3398
3654
3944
4245
4569
4930

2.6
2.8
3.0
3.3
3.5
3.8
4.1
4.4
4.8
5.1
5.5

1211
1219
1228
1238
1251
1262
1275
1290
1305
1322
1341

2734
2921
3119
3332
3569
3814
4075
4370
4676
5006
5373

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts

Bhp

Rpm

1.0
Watts

Bhp

1653
1816
1993
2187
2406
2635
2880
3156
3445
3754
4098

1.9
2.0
2.2
2.4
2.7
2.9
3.2
3.5
3.9
4.2
4.6

1039
1052
1064
1079
1096
1112
1129
1149
1169
1189
1213

1993
2163
2345
2546
2770
3004
3256
3540
3835
4152
4506

2.2
2.4
2.6
2.8
3.1
3.4
3.6
4.0
4.3
4.6
5.0

EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts

Bhp

Rpm

2.0
Watts

Bhp

4.0
4.2
4.4
4.7
5.0
5.3
5.6
5.6
6.3
6.6
7.1

1433
1440
1447
1454
1462
1470
1478
1489
1499
1509
1515

3944
4170
4400
4643
4906
5173
5453
5765
6087
6420
6733

4.4
4.7
4.9
5.2
5.5
5.8
6.1
6.5
6.8
7.2
7.5

1.2
1.4
1.5
1.7
2.0
2.2
2.5
2.7
3.0
3.4
3.7

3.1
3.3
3.5
3.7
4.0
4.3
4.6
4.9
5.2
5.6
6.0

846
865
885
907
930
952
975
1000
1024
1049
1076

1289
1297
1305
1313
1324
1334
1344
1358
1371
1386
1403

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates standard operating range.

1341
1497
1668
1856
2067
2289
2526
2793
3072
3371
3704

3127
3325
3532
3755
3999
4250
4517
4817
5128
5463
5835

1.5
1.7
1.9
2.1
2.3
2.6
2.8
3.1
3.4
3.8
4.1

3.5
3.7
4.0
4.2
4.5
4.8
5.1
5.4
5.7
6.1
6.5

945
961
977
994
1015
1034
1053
1076
1098
1120
1146

1363
1370
1377
1385
1395
1403
1412
1424
1436
1449
1465

3531
3742
3961
4192
4445
4704
4976
5283
5598
5938
6316

5. Static pressure losses (i.e., economizer) must be added to external static pressure before entering Fan Performance table. See
Table 7 for accessory/FIOP static pressure information.
6. Interpolation is permissible. Do not extrapolate.
7. Maximum continuous bhp is 5.9 and the maximum continuous watts
are 5180. Extensive motor and drive testing on these units ensures that the full horsepower range of the motor can be utilized
with confidence. Using your fan motors up to the watts rating shown
will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.

2.
indicates field-supplied motor and drive required.
3. All other numbers indicate field-supplied drive required.
4. Factory shipped motor drive range is 1238 to 1494 rpm. Other rpms
require a field-supplied drive.

Table 5 — Fan Performance Data, 48HJ025 Units
AIRFLOW
(CFM)
6000
6500
7000
7500
8000
8500
9000
9500
10000

AIRFLOW
(CFM)
6000
6500
7000
7500
8000
8500
9000
9500
10000

Rpm
800
853
907
962
1017
1072
1128
1185
1241

0.2
Watts
1732
2134
2596
3123
3717
4385
5129
5955
6865

Rpm
1208
1239
1273
1309
1349
1390
1433
1478
1524

1.2
Watts
3504
3983
4529
5143
5833
6600
7446
8378
9396

Bhp
1.88
2.32
2.82
3.39
4.04
4.76
5.57
6.47
7.45

Bhp
3.80
4.32
4.92
5.58
6.33
7.17
8.08
9.10
10.20

Rpm
891
939
989
1039
1091
1143
1196
1250
1304

Rpm
1282
1308
1339
1372
1409
1447
1488
—
—

0.4
Watts
2047
2471
2957
3507
4126
4818
5587
6437
7372

1.4
Watts
3926
4415
4970
5597
6297
7077
7938
—
—

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Bhp
Rpm
Watts
Bhp
Rpm
Watts
2.22
975
2376
2.58
1055
2728
2.68
1018
2819
3.06
1094
3185
3.21
1064
3324
3.61
1136
3707
3.81
1111
3895
4.23
1179
4295
4.48
1160
4536
4.93
1225
4954
5.23
1209
5250
5.70
1271
5688
6.07
1260
6042
6.56
1323
6501
6.99
1311
6915
7.51
1369
7395
8.00
1363
7873
8.65
1419
8376

Bhp
2.96
3.46
4.02
4.66
5.38
6.18
7.06
8.03
9.09

Rpm
1133
1167
1205
1245
1287
1332
1377
1424
1472

1.0
Watts
3104
3573
4107
4710
5386
6137
6968
7881
8882

Bhp
3.37
3.88
4.46
5.11
5.85
6.66
7.57
8.56
9.64

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Watts
Bhp
Rpm
4.26
1353
4368
4.74
1421
4.79
1376
4866
5.28
1442
5.40
1403
5432
5.90
1467
6.08
1434
6067
6.59
1494
6.84
1467
6779
7.36
1529
7.68
1504
7571
8.22
—
8.62
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
5.24
5.79
6.42
7.12
7.94
—
—
—
—

Rpm
1488
1507
1520
1548
—
—
—
—
—

2.0
Watts
5299
5823
6339
7014
—
—
—
—
—

Bhp
5.75
6.32
6.88
7.62
—
—
—
—
—

1.8
Watts
4826
5337
5911
6558
7313
—
—
—
—

5. Interpolation is permissible. Do not extrapolate.
6. Maximum continuous bhp is 10.2 for 208/230 and 575-v units and
11.8 for 460-v units. The maximum continuous watts are 9510 for
the 208/230 and 575-v units and 11,000 for the 460-v units. Extensive motor and drive testing on these units ensures that the full
horsepower range of the motor can be utilized with confidence.
Using your fan motors up to the watts rating shown will not result
in nuisance tripping or premature motor failure. Unit warranty will
not be affected.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
NOTES:
1. Boldface indicates standard operating range.
2. All other numbers indicates field-supplied drive required.
3. Factory shipped motor drive range is 1323 to 1579 rpm. Other rpms
require a field-supplied drive.
4. Static pressure losses (i.e., economizer) must be added to external static pressure before entering Fan Performance table. See
Table 7 for accessory/FIOP static pressure information.

Table 6 — Air Quantity Limits
UNIT 48HJ
015
017
025

MINIMUM CFM
3,750
4,500
6,000

MAXIMUM CFM
6,250
7,500
10,000

Fig. 24 — Fan Performance Using Accessory
Power Exhaust

Table 7 — Accessory/FIOP Economizer Static Pressure (in. wg)
UNIT
480HJ

UNIT
VOLTAGE

015, 017

All

025

All

CFM
3,750
4,000
5,000
6,000
7,500
6,000
7,200
9,000
10,000

LEGEND

ECONOMIZER
PRESSURE DROP
.03
.03
.05
.07
.10
.07
.09
.11
.12

2. 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 table to determine blower
rpm, bhp, and watts.

BHP — Brake Horsepower
FIOP — Factory-Installed Option
NOTES:
1. The factory-assembled horizontal adapter substantially improves
fan performance. See Fig. 24.

Pressure switch closes and pilot valve no. 1 opens, allowing gas to flow to the first-stage pilot. Spark ignitor
ignites pilot flame. Sensor detects flame and the main gas
valve no. 1 opens. Gas flows to main burners and first-stage
burners ignite. Spark igniter turns off.
When sequence is complete, time-delay relay closes and
evaporator fans start.
Second-Stage — On 2-stage units, with an additional heating call, the second-stage thermostat closes. (The control relay [HR2] closes during the first stage of operation.) Pilot
valve no. 2 opens, and the spark ignitor ignites pilot. The
sensor detects a flame and energizes main gas valve coil
no. 2, opening main gas valve no. 2. Gas flows to the main
burners, and the second-stage burners ignite. The spark ignitor
turns off.
When the second-stage thermostat is satisfied, the secondstage gas valve closes.
When the first-stage thermostat is satisfied, the first-stage
gas valve closes. The induced-draft motor turns off, the time
delay relay is deenergized, and the timer sequence begins.
When the sequence is complete, the evaporator-fan motor
turns off.
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 above.
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
(017,025) or unloaded compressor (015) 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.
HEATING, UNITS WITH ECONOMIZER — Outdoor-air
damper stays at VENT position while evaporator fan is
operating.

Gas Heat — Verify gas pressures before turning on heat
as follows:
1. Turn off manual gas stop.
2. Connect pressure gage to supply gas tap (See Fig. 13 on
page 8).
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 5.0 in. wg or greater, and that
the manifold pressure is 3.5 in. wg. If manifold pressure
must be adjusted, refer to Gas Valve Adjustment section
on page 22.
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.
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 (017,025) or unloaded
compressor (015), and condenser fan start. The condenserfan 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 (017,025), or compressor no. 1 runs fully
loaded (015).
A freeze protection thermostat (FPT) is located on the
evaporator coil. It detects frost build-up and locks out the
compressors, allowing the coil to clear. Once frost has melted,
the compressors can be reenergized by resetting the
thermostat.
HEATING, UNITS WITHOUT ECONOMIZER
NOTE: The 48HJD015 units have 1 stage of heat, and the
48HJE015, 48HJE017, and HJD025 units have 2 stages of
heat.
First Stage — Turn unit power on. Open manual gas line
valve. Set thermostat system switch at HEAT or AUTO. position and set fan switch to AUTO. position for heating.
First-stage thermostat calls for heat. Time-delay relay for
evaporator fan begins timer sequence. Induced-draft relay
closes, and induced-draft motor starts.
17

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 AND PILOT BURNERS — At the beginning of each
heating season, inspect for deterioration or blockage due to
corrosion or other causes. Observe the pilot and main burner
flames through view port (in condenser section), and adjust
if necessary. Refer to Pilot Adjustment or Main Burners sections on pages 22 and 23.

Fig. 25 — Typical Gas Heating Section
(48HJE015, 48HJE017, and 48HJD025 Shown)

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. 25). Refer to Main Burners section on
page 23 for burner removal sequence. If cleaning is required, remove heat exchanger turbulators (Fig. 26) and clean
all parts with a wire brush.
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. 25 and 26). 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.

Fig. 26 — Typical Heating Section With
Main Burners Removed
(48HJE015, 48HJE017, and 48HJD025 Shown)

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.
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use disposable filters in place of screens.

Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. Observe the level in the
sight glass immediately after shutdown while the oil is still
warm. If the oil level is observed when the oil is cold, the
level observed may be a mixture of oil and refrigerant which
is not a true indication of the oil level. If oil level observed
is not between the low limit and high limit levels as indicated in Fig. 27, add oil until it is in the correct range.

Fig. 27 — Compressor Sight Glass Oil Level

2. 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. 28).

FAN SHAFT BEARINGS — For 015 units, the bearings are
permanently lubricated. No field lubrication is required. For
017 and 025 units, the bearings are of the pillow block type
and have grease fittings. The bearing opposite the motor end
has an extended tube line so it can be lubricated from the
motor side. Lubricate the bearings twice annually.
Typical lubricants are given below:
MANUFACTURER
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, 48HJ015 Units
PERFORMANCE ADJUSTMENT — The 48HJ015 fan motor pulleys are factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting plate nuts.
3. Loosen movable-pulley flange setscrew (see Fig. 28).
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.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew.
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.
SERVICE AND REPLACEMENT (See Fig. 29)
NOTE: To remove belts only, follow Steps 1-7.
1. Remove filter and supply-air section panels.
2. Remove unit top cover.
3. Remove coil guard.
4. Loosen screws A and B on both sides of motor mount
assembly.
5. Loosen screw C.
6. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
7. Remove belt.
8. Rotate motor mount assembly back past original position toward evaporator coil.
9. Remove motor mounting nuts D and E (both sides).
10. Lift motor up through top of unit.
11. Reverse above procedure to reinstall motor.
12. Check and adjust belt tension as necessary.

Fig. 28 — Evaporator-Fan Alignment and
Adjustment

Evaporator Fan, 48HJ017,025 Units
PERFORMANCE ADJUSTMENT — Fan motor pulleys are
factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.

Fig. 29 — 48HJ015 Evaporator-Fan
Motor Adjustment

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 position adjustment on the economizer motor control module. See
Fig. 18.
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.

SERVICE AND REPLACEMENT (See Fig. 30) — The
48HJ017,025 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 two 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. 015 Units: Move motor mounting plate up or down
for proper belt tension (1⁄2 in. deflection with one
finger).
b. 017,025 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.

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 motor.

Condenser-Fan Adjustment

Fig. 30 — 48HJ017,025 Evaporator-Fan
Motor Section

48HJ015,017 UNITS (Fig. 31)
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 the fan height on the shaft using a straightedge
placed across the fan orifice.
5. Tighten setscrews and replace panel(s).
6. Turn on unit power.
48HJ025 UNITS (Fig. 32)
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 — Condenser Fan Adjustment,
48HJ015,017

Economizer Adjustment — Refer to Tables 8 and 9
for economizer checkout procedures. 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.

Fig. 32 — Condenser-Fan Adjustment,
48HJ025
20

Unit panels must be in place when unit is operating during charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of
refrigerant (refer to Table 1).
LOW CHARGE COOLING — Using appropriate cooling
charging chart (see Fig. 33-35), add refrigerant until conditions of the chart are met. Note that charging charts are different from those normally used. Charts are based on charging units to correct superheat for various operating conditions.
An accurate pressure gage and temperature sensing device
are required. Connect temperature sensing device to service
port on suction line and insulate it so that outdoor ambient
temperature does not affect reading. Indoor-air cfm must be
within normal operating range of unit.
TO USE COOLING CHARGING CHART — Take outdoor
ambient temperature and read the suction pressure gage. Refer to appropriate chart to determine correct suction temperature. If suction temperature is high, add refrigerant. If
suction temperature is low, carefully reclaim some of the charge.
Recheck suction pressure as charge is adjusted.

5. Set the outdoor-air thermostat (OAT), located in the economizer section of the unit 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.
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.
Table 8 — Economizer Checkout Procedures
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.

Pilot Light — If pilots do not light as described in Gas
Heat section on page 17, be sure that pilot orifice is not obstructed, then check for spark ignitor malfunctions as follows:
1. Shut off control supply power to ignitor control pack (ICP).
2. Check that spark gap is 1⁄8 in. 6 1⁄32 inch.
3. Check that ICP is securely grounded.
4. Check that high-voltage lead is securely connected between ICP and electrode body.
5. Restore power to ICP. Check that 24 v is supplied
to terminal TH of ICP.

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

6. Check unit label diagram for correct terminal usage if any
wires are removed.

1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.

Table 9 — High and Low Outdoor-Air Temperature
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.

RESULTS

Low outdoor-air temperature
test results:
1. LED (light-emitting diode)
should be on.
2. Motor drives toward open.
D. Turn set point potentiometer
to position D.
E. Disconnect 1200 ohm checkout resistor.
High outdoor-air temperature
test results:
1. LED should be off.
2. Motor drives toward closed.

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.

Fig. 33 — Cooling Charging Chart, 48HJ015
21

7. Check for proper burner operation by cycling the burners. Wait 30 seconds between burner cycles.
8. Check that all unit panels are in place before leaving unit.

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 3 and 4, the
pilot valve opens to the preset position. When power is supplied to terminals 1 and 2, the main valve opens to its preset
position.
The regular factory setting is stamped on the valve body
(3.5 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.

Fig. 34 — Cooling Charging Chart, 48HJ017

Fig. 36 — Gas Valve
VIEW
PORT

FLUE BOX
COVER

PRIMARY AIR
SHUTTER

Fig. 35 — Cooling Charging Chart, 48HJ025

Pilot Adjustment
1. Set system selector switch at OFF position to shut off unit.
Turn off power to unit.
2. Remove screw cap cover on pilot gas valve to expose
adjusting screw (See Fig. 36).
3. Turn valve knobs to pilot position.
4. Turn on power to unit. Set system selector switch to HEAT
position and set thermostat to a setting that will call for
heat. Pilot ignites.
5. With a small screwdriver, turn adjustment screw until flame
fully engulfs sensor. Flame can be observed through view
port (Fig. 37).
6. Turn off power to unit. Replace cap on pilot gas valve.
Return valve knob(s) to original position.

MAIN BURNER
SECTION

Fig. 37 — Typical Heating Section
22

in the crankcase when the compressor is idle. Since power
for the crankcase heaters is drawn from the unit incoming
power, main unit power must be on for the heaters to be
energized.

Main Burners — For most applications, main burners
are factory set and should require no adjustment. However,
if burner adjustment is necessary:
1. Perform pilot adjustment.
2. Turn gas valve to ON position. Allow unit to operate at
least 15 minutes with burner access panel in place.
3. Remove access panel.
4. Loosen primary air shutter (Fig. 37) and adjust to a minimum opening of 5⁄8 inch.
5. Retighten primary air shutter and reinstall access panel.
To check ignition of main burners and fan switch operation, move thermostat dial above and below room temperature several times, pausing at least one minute between cycles.
MAIN BURNER REMOVAL
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power to unit.
3. Remove unit control box/gas valve access panel, burner
section access panel, and center post (Fig. 4 and 5).
4. Disconnect pilot ignitor and pilot proving sensor leads at
ICP, rollout switch leads at switch, and pilot tube gas connection(s) at the pilot orifice.
5. Disconnect gas connection(s) from between gas valve(s)
and main burners.
6. Remove 2 screws securing burner assembly to base unit.
7. Slide burner assembly out of unit.

IMPORTANT: After a prolonged shutdown or service job, energize the crankcase heaters for 24 hours
before starting the compressors.
Compressor Lockout — If any of the safeties (high-, lowpressure, 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.
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 evaporator coil. It detects frost
build-up and turns off the compressor, allowing the coil to
clear. Once the frost has melted, the compressor can be
reenergized by resetting the CLO from the thermostat.

Filter Drier — Replace whenever refrigerant system is
exposed to atmosphere.

Protective Devices
COMPRESSOR PROTECTION
Overcurrent — Each compressor has one manual reset, calibrated trip, magnetic circuit breaker. Do not bypass connections or increase the size of the circuit breaker to correct trouble.
Determine the cause and correct it before resetting the breaker.
Overtemperature — Each compressor has an internal protector to protect it against excessively high discharge gas
temperatures.
Crankcase Heater— Each compressor has a 125-watt crankcase heater to prevent absorption of liquid refrigerant by oil

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.

Replacement Parts — A complete list of replacement
parts may be obtained from any Carrier distributor upon
request.

Fig. 38 — Typical Wiring Schematic (48HJ025 Shown)

Fig. 38 — Typical Wiring Schematic (48HJ025 Shown) (cont)

Fig. 39 — Typical Component Arrangement (48HJ025 Shown)

LEGEND FOR FIG. 38 and 39
AHA
BKR W/AT
C
CB
CC
CH
CLO
CLS
COMP
CR
CT
DM
DU
EQUIP
FPT

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

FU
GND
HPS
HR
HV
I
ICP
IDM
IDR
IFC

—
—
—
—
—
—
—
—
—
—

IFCB

—

Adjustable Heat Anticipator
Breaks with Amp Turns
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
High-Pressure Switch
Heat Relay
High Voltage
Ignitor
Ignitor Control Pack
Induced-Draft Motor
Induced-Draft Relay
Indoor (Evaporator)
Fan Contactor
Indoor (Evaporator)
Fan Circuit Breaker

IFM
IFR
IP
L
LOR
LPS
LS
MAT
MGV
NEC
OAT
OFC
OFM
PGV
PL
PRI
PS
QT
R
RS
SN
SW
TB
TC
TDR

— Indoor (Evaporator)
Fan Motor
— Indoor (Evaporator)
Fan Relay
— Internal Protector
— Light
— 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
— Pilot Gas Valve
— Plug Assembly
— Primary
— Pressure Switch
— Quadruple Terminal
— Relay
— Rollout Switch
— Sensor
— Switch
— Terminal Block
— Thermostat Cooling
— Time Delay Relay

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. Set thermostat heat anticipator(s):
UNIT
48HJD015
48HJD025, HJE015,
HJE017

W1
1.20

W2
—

VOLTAGE
All

1.20

0.60

All

TH
— Thermostat Heating
TRAN — Transformer
Terminal (Marked)
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

5. CB must-trip amps are equal to or less than 140% full load amps.
6. 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 normally-open contact.
7. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices. Before replacing CLO, check
these devices.

PACKAGED SERVICE TRAINING
Our packaged service training programs provide an excellent way to increase your knowledge of the
equipment discussed in this manual. Product programs cover:
• Unit Familiarization
• Maintenance
• Installation Overview
• Operating Sequence
A large selection of product, theory, and skills programs is available. All programs include a video
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training
sessions.
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are
included.

Copyright 1995 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. 534-807
Printed in U.S.A.
Form 48HJ-9SI
Pg 30
2-95
Replaces: 48HJ-5SI
Tab 1a

SERIAL NO.:

DATE:

TECHNICIAN:

PRE-START-UP:
M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
M REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS
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

START-UP
ELECTRICAL
SUPPLY VOLTAGE

L1-L2

L2-L3

L3-L1

COMPRESSOR AMPS — COMPRESSOR NO. 1

— COMPRESSOR NO. 2

SUPPLY FAN AMPS

EXHAUST FAN AMPS

TEMPERATURES
OUTDOOR-AIR TEMPERATURE

F DB (Dry Bulb)

RETURN-AIR TEMPERATURE

F DB

COOLING SUPPLY AIR

GAS HEAT SUPPLY AIR

WB (Wet Bulb)

PRESSURES
IN. WG

GAS INLET PRESSURE

IN. WG

STAGE NO. 2

IN. WG

GAS MANIFOLD PRESSURE

STAGE NO. 1

REFRIGERANT SUCTION

CIRCUIT NO. 1

PSIG

CIRCUIT NO. 2

PSIG

REFRIGERANT DISCHARGE

CIRCUIT NO. 1

PSIG

CIRCUIT NO. 2

PSIG

M VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 21 AND 22
GENERAL
M ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

CUT ALONG DOTTED LINE

MODEL NO.:

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

START-UP CHECKLIST

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Carrier Single Package Rooftop Units Electric Cooling Gas Heating 48Hj015 025 Users Manual

48HJ015-025 to the manual 88791006-9120-4aeb-863e-83f5c7ef6fb1

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