Carrier 48AJ User manual

Brand: Carrier

Model: 48AJ

Category: Split-system air conditioners

Type: User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53480067-01 Printed in U.S.A. Form 48A-7SI Pg 1 8-09 Replaces: 48A-5SI

Installation Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36

Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1

• ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 2

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork. . . . . . . . . . . . . . . 2

Step 4 — Make Unit Duct Connections . . . . . . . . . . . 2

Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 19

Step 6 — Trap Condensate Drain . . . . . . . . . . . . . . . . 19

Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . 19

Step 8 — Make Electrical Connections . . . . . . . . . . 20

•POWER WIRING

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

Step 9 — Make Outdoor-Air Inlet

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

• ECONOMIZER AND FIXED OUTDOOR

AIR DAMPER

Step 10 — Position Power Exhaust/Barometric

Relief Damper Hood. . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Step 11 — Route VAV Static Pressure Sensor . . . 34

Step 12 — Install All Accessories . . . . . . . . . . . . . . . 35

Step 13 — Field Modifications. . . . . . . . . . . . . . . . . . . 35

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should in-

stall, 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 per-

sonnel. 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.

INSTALLATION

Step 1 — Provide Unit Support

WARNING

Before performing service or maintenance operations on

unit, turn off main power switch to unit. Electrical shock

could cause personal injury.

WARNING

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 va-

pors 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 neigh-

bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire

department.

WARNING

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).

CAUTION

1. All panels must be in place when rigging or damage

to unit may occur.

2. Unit is not designed for handling by fork truck.

WEATHERMAKER

48AJ,AK,AW,AY020-060

Single Package Rooftop Units

Electric Cooling/Gas Heating

with Scroll Compressor and

COMFORTLINK™ Controls

ROOF CURB — For vertical discharge units, assemble or in-

stall accessory roof curb in accordance with instructions

shipped with this accessory. See Fig. 1-3. 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 func-

tion properly. Unit leveling tolerance is shown in Fig. 1-3.

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.

ALTERNATE UNIT SUPPORT — When the preferred curb

or slab mount cannot be used, support unit with sleepers on pe-

rimeter, using unit curb support area. If sleepers cannot be

used, support long sides of unit (refer to Fig. 4-10) with a mini-

mum number of 4-in. x 4-in. pads spaced as follows:

48AJ,AK,AW,AY020-035 units require 3 pads on each side;

48AJ,AK,AW,AY036-050 units require 4 pads on each side;

48AJ,AK,AW,AY051 and 060 units require 6 pads on each

side. Unit may sag if supported by corners only.

Step 2 — Rig and Place Unit — Inspect unit for

transportation damage. See Tables 1-6 for physical data and

specifications. File any claim with transportation agency.

Do not drop unit; keep upright. Use spreader bars over unit

to prevent sling or cable damage. This unit must be handled

with a crane and can not be handled by a fork truck. Level by

using unit frame as a reference; leveling tolerance is shown in

Fig. 1-3. See Fig. 10 for additional information. Unit operating

weight is shown in Table 2.

NOTE: On retrofit jobs, ductwork may be attached to the old

unit instead of a roof curb. Be careful not to damage ductwork

when removing old unit. Attach existing ductwork to roof curb

instead of unit.

Four lifting lugs are provided on the unit base rails as shown

in Fig. 4-10. Refer to rigging instructions on unit.

POSITIONING — Maintain clearance, per Fig. 4-10, 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 venti-

lation 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 assem-

bly must be at least 7 ft above grade.

ROOF MOUNT — Check building codes for weight distribu-

tion requirements. See Fig. 11. Unit operating weight is shown

in Table 2.

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use flexible duct connectors be-

tween unit and ducts as required. Insulate and weatherproof all

external ductwork, joints, and roof openings with counter

flashing and mastic in accordance with applicable codes.

NOTE: Due to width of the horizontal supply and return duct-

work, provisions should be made for servicing of the outdoor

air filters (i.e., catwalk over ductwork).

Ducts passing through an unconditioned space must be in-

sulated and covered with a vapor barrier. Outlet grilles must not

lie directly below unit discharge. The return duct must have a

90-degree elbow before opening into the building space if the

unit is equipped with power exhaust.

To attach ductwork to roof curb, insert duct approximately

10 to 11 in. up into roof curb. Connect ductwork to 14-gage

roof curb material with sheet metal screws driven from inside

the duct.

Follow AMCA (Air Movement and Control Association)

guidelines relating to ductwork connections to the unit. These

guidelines recommend a minimum 2

equivalent duct diame-

ters of straight duct connected to supply air inlet and outlet

openings before any transitions, fittings, dampers, etc. Failure

to adhere to these guidelines may result in system effects which

can impact the unit’s ability to achieve published performance.

Step 4 — Make Unit Duct Connections

48AJ AND AK UNITS — Unit is shipped for thru-the-

bottom duct connections. Field-fabricated ductwork should be

attached to the roof curb. Supply and return duct dimensions

are shown in Fig. 4-6. Air distribution is shown in Fig. 12.

Refer to installation instructions shipped with roof curb for

more information.

48AW AND AY UNITS — Remove shipping covers from

supply and return air openings. Attach field-supplied ductwork

to unit. Connect to the unit with a single duct for all supply

openings and with a single duct for all return openings.

Splitting of the airflow into branch ducts should not be done at

the unit. Sufficient duct length should be used prior to branch-

ing to ensure the air temperatures are well mixed within the

ductwork. See Fig. 7-9 for duct opening dimensions. Secure all

ducts to building structure. Air distribution is shown in Fig. 7-9

and Fig. 13.

Install accessory barometric relief or power exhaust in the

field-fabricated return ductwork. Refer to Step 10 — Position

Power Exhaust/Barometric Relief Damper Hood section on

page 33 for more information.

Instructions continued on page 19.

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. 1-3. Improperly applied gasket can

also result in air leaks and poor unit performance.

WARNING

For vertical supply and return units, tools or parts could

drop into ductwork and cause an injury. Install a 90-degree

elbow turn in the supply and return ductwork between the

unit and the conditioned space. If a 90-degree elbow cannot

be installed, then a grille of sufficient strength and density

should be installed to prevent objects from falling into the

conditioned space.

Fig. 1 — Roof Curb — 48AJ,AK020-035 Units

a48-6715

NOTES:

1. UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE TO OUTSIDE OF PART.

2. ROOF CURB ACCESSORY CRRFCURB005A00 IS SHIPPED DISASSEMBLED.

3. ALL ROOF CURB PARTS ARE TO BE 14 GA. GALVANIZED STEEL.

4. UNITS WITH ELECTRIC HEAT MUST BE INSTALLED WITH A 90° ELBOW ON THE SUPPLY

DUCT PRIOR TO ANY SUPPLY TAKE OFFS OR BRANCHES.

5. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL OTHER DIMENSIONS ARE IN INCHES.

Fig. 2 — Roof Curb — 48AJ,AK036-050 Units

a48-6716

NOTES:

1. UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE TO OUTSIDE OF PART.

2. ROOF CURB ACCESSORY CRRFCURB005A00 IS SHIPPED DISASSEMBLED.

3. ALL ROOF CURB PARTS ARE TO BE 14 GA. GALVANIZED STEEL.

4. UNITS WITH ELECTRIC HEAT MUST BE INSTALLED WITH A 90° ELBOW ON THE SUPPLY

DUCT PRIOR TO ANY SUPPLY TAKE OFFS OR BRANCHES.

5. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL OTHER DIMENSIONS ARE IN INCHES.

Fig. 3 — Roof Curb — 48AJ,AK051 and 060 Units

a48-6717

NOTES:

1. UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE TO

OUTSIDE OF PART.

2. ROOF CURB ACCESSORY CRRFCURB005A00 IS SHIPPED DIS-

ASSEMBLED.

3. ALL ROOFCURB PARTS ARE TO BE 14 GA. GALVANIZED STEEL.

4. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL OTHER DIMEN-

SIONS ARE IN INCHES.

* OPERATING WEIGHT INCLUDES LARGEST INDOOR FAN MOTOR, CU/AL COILS,

MODULATING POWER EXHAUST (VARIABLE AIR VOLUME), AND VARIABLE

FREQUENCY DRIVE (VARIABLE AIR VOLUME).

Fig. 4 — Base Unit Dimensions — 48AJ,AK020-035

a48-8235

NOTES:

1. WEIGHTS INCLUDE ECONOMIZER (STD).

2. CENTER OF GRAVITY.

3. UNIT CLEARANCES:

TOP OF UNITS: NO OVERHANG

CONDENSER COIL: 4’ - 0“ [1219]

ECONOMIZER SIDE: 6’ - 0” [1829]

HEAT SIDE: 4’’ - 0” [1219]

FILTER ACCESS SIDE: 10’ - 0” [3048] (FOR

REMOVAL OF EVAPORATOR COIL)

4. FOR SMALLER SERVICE AND OPERATIONAL

CLEARANCES, CONTACT CARRIER APPLICA-

TION ENGINEERING DEPARTMENT.

5. BOTTOM DUCTS ARE DESIGNED TO BE AT-

TACHED TO ACCESSORY ROOF CURB. IF UNIT

IS MOUNTED ON DUNNAGE, IT IS RECOM-

MENDED THAT THE DUCTS BE SUPPORTED

BY CROSS BRACES AS DONE ON ACCESSO-

RY ROOF CURB.

6. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL

OTHER DIMENSIONS ARE IN INCHES.

* OPERATING WEIGHT INCLUDES LARGEST INDOOR FAN MOTOR, CU/AL COILS,

MODULATING POWER EXHAUST (VARIABLE AIR VOLUME), AND VARIABLE

FREQUENCY DRIVE (VARIABLE AIR VOLUME).

Fig. 5 — Base Unit Dimensions — 48AJ,AK036-050

a48-8236

OTES:

1. WEIGHTS INCLUDE ECONOMIZER (STD).

2. CENTER OF GRAVITY.

3. UNIT CLEARANCES:

TOP OF UNITS: NO OVERHANG

CONDENSER COIL: 4’ - 0“ [1219]

ECONOMIZER SIDE: 6’ - 0” [1829]

HEAT SIDE: 4’’ - 0” [1219]

FILTER ACCESS SIDE: 10’ - 0” [3048] (FOR

REMOVAL OF EVAPORATOR COIL)

4. FOR SMALLER SERVICE AND OPERATIONAL

CLEARANCES, CONTACT CARRIER APPLICA-

TION ENGINEERING DEPARTMENT.

5. BOTTOM DUCTS ARE DESIGNED TO BE AT-

TACHED TO ACCESSORY ROOF CURB. IF UNIT

IS MOUNTED ON DUNNAGE, IT IS RECOM-

MENDED THAT THE DUCTS BE SUPPORTED BY

CROSS BRACES AS DONE ON ACCESSORY

ROOF CURB.

6. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL

OTHER DIMENSIONS ARE IN INCHES.

Fig. 6 — Base Unit Dimensions — 48AJ,AK051 and 060

Fig. 7 — Base Unit Dimensions — 48AW,AY020-035

A48-8380

NOTES:

1. WEIGHTS INCLUDE ECONOMIZER (STD).

2. CENTER OF GRAVITY.

3. UNIT CLEARANCES:

TOP OF UNITS: NO OVERHANG

CONDENSER COIL: 4’ - 0“ [1219]

ECONOMIZER SIDE: 6’ - 0” [1829]

HEAT SIDE: 4’’ - 0” [1219]

FILTER ACCESS SIDE: 10’ - 0” [3048] (FOR REMOVAL OF

EVAPORATOR COIL)

4. FOR SMALLER SERVICE AND OPERATIONAL CLEARANCES,

CONTACT CARRIER APPLICATION ENGINEERING

DEPARTMENT.

5. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL OTHER DIMEN-

SIONS ARE IN INCHES.

* OPERATING WEIGHT INCLUDES LARGEST INDOOR FAN MOTOR, CU/AL COILS,

MODULATING POWER EXHAUST (VARIABLE AIR VOLUME), AND VARIABLE

FREQUENCY DRIVE (VARIABLE AIR VOLUME).

Fig. 8 — Base Unit Dimensions — 48AW,AY036-050

a48-8239

NOTES:

1. WEIGHTS INCLUDE ECONOMIZER (STD).

2. CENTER OF GRAVITY.

3. UNIT CLEARANCES:

TOP OF UNITS: NO OVERHANG

CONDENSER COIL: 4’ - 0“ [1219]

ECONOMIZER SIDE: 6’ - 0” [1829]

HEAT SIDE: 4’’ - 0” [1219]

FILTER ACCESS SIDE: 10’ - 0” [3048] (FOR REMOVAL

OF EVAPORATOR COIL)

4. FOR SMALLER SERVICE AND OPERATIONAL CLEAR-

ANCES, CONTACT CARRIER APPLICATION ENGINEER-

ING DEPARTMENT.

5. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL OTHER DI-

MENSIONS ARE IN INCHES.

Fig. 9 — Base Unit Dimensions — 48AW,AY051 and 060

a48-8240

FOR CENTERS OF

GRAVITY, OPERATING

AND CORNER WEIGHTS,

SEE FIGURE 10

48AJ/AK LOW HEAT

48AJ/AK HIGH HEAT

48AJ/AK LOW HEAT

48AJ/AK HIGH HEAT

48AW/AY HIGH HEAT

48AW/AY LOW HEAT

48AW/AY HIGH HEAT

48AJ/AK051 LOW HEAT

48AJ/AK051 HIGH HEAT

48AW/AY051 LOW HEAT

48AW/AY051 HIGH HEAT

48AJ/AK060 LOW HEAT

48AW/AY060 LOW HEAT

48AJ/AK060 HIGH HEAT

48AW/AY060 HIGH HEAT

Fig. 10 — Center of Gravity and Weights — 48AJ,AK,AW,AY051,060

a50-8102

NOTES:

1. WEIGHTS INCLUDE ECONOMIZER OR OUTDOOR AIR

DAMPER.

2. CENTER OF GRAVITY.

3. UNIT CLEARANCES:

TOP OF UNITS: NO OVERHANG

CONDENSER COIL: 4’ - 0“ [1219]

ECONOMIZER SIDE: 6’ - 0” [1829]

HEAT SIDE: 4’’ - 0” [1219]

FILTER ACCESS SIDE: 15’ - 0” [4572] (FOR REMOVAL

OF EVAPORATOR COIL)

4. FOR SMALLER SERVICE AND OPERATIONAL CLEARANCES,

CONTACT CARRIER APPLICATION ENGINEERING DEPART-

MENT.

5. BOTTOM DUCTS ARE DESIGNED TO BE ATTACHED TO AC-

CESSORY ROOF CURB. IF UNIT IS MOUNTED ON DUNNAGE,

IT IS RECOMMENDED THAT THE DUCTS BE SUPPORTED BY

CROSS BRACES AS DONE ON ACCESSORY ROOF CURB.

6. BASE UNIT WEIGHTS INCLUDE OUTDOOR AIR HOODS AND

FILTERS (INDOOR FAN MOTOR IS NOT INCLUDED). ADD IN-

DOOR FAN MOTOR, FIOPS, AND ACCESSORIES FOR TOTAL

OPERATING WEIGHT.

7. VAV MOTOR WEIGHTS INCLUDE INDOOR MOTOR, VFD, VFD

TRANSDUCER, AND ASSOCIATED WIRING.

8. DIMENSIONS IN [ ] ARE IN MILLIMETERS. ALL OTHER DIMEN-

SIONS ARE IN INCHES.

9. FOR SIDE-SUPPLY/RETURN APPLICATIONS, A SINGLE RE-

TURN AND SUPPLY DUCTWORK CONNECTION IS RECOM-

MENDED FOR COVERING ALL THREE RETURN AND ALL

THREE SUPPLY OPENINGS. THE ENTIRE AREA AROUND

THE DUCT OPENINGS IS AVAILABLE FOR A 1.5” DUCT

FLANGE ATTACHMENT.

LEGEND

CV — Constant Volume

FIOP — Factory-Installed Option

IFM — Indoor Fan Motor

VAV — Volume Air volume

VFD — Variable Frequency Drive

Table 1 — Physical Data — 48AJ,AK,AW,AY Units

LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper

portion.

Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have

intertwined evaporator coils.

†Rollout switch is manual reset.

UNIT 48AJ,AK,AW,AY 020 025 027 030

NOMINAL CAPACITY (tons) 20 25 27 30

BASE UNIT See Operating Weights Table

OPERATING WEIGHT (lb)

COMPRESSOR

Quantity ... Type (Ckt 1/Ckt 2) 2…SR*782AT/1…SR*782AE

1…SR*812AT, 1…SR*942AT/

1…SR*942AE

2 ... SR*942AT/1…SR*942AE 2…SR*782AT/2…SR*812AT

Number of Refrigerant Circuits 22 22

Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged

REFRIGERANT TYPE R-22

Operating Charge (lb-oz)

Circuit 1 26-8 33-8 35-8 29-0

Circuit 2 14-0 17-8 20-0 30-8

CONDENSER COIL* Internally Enhanced,

″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

Quantity 11 11

Rows ... Fins/in. 2 ... 15 3 ... 15 3 ... 15 4 ... 15

Total Face Area (sq ft) 33.3 33.3 33.3 33.3

CONDENSER FAN Propeller Type

Nominal Cfm 17,200 15,850 15,850 14,500

Quantity... Diameter (in.) 2 ... 30 2 ... 30 2 ... 30 2 ... 30

Motor Hp 11 11

EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits

Tube Size (in.)

Rows ... Fins/in. 3 ... 15 3 ... 15 4 ... 15 4 ... 15

Total Face Area (sq ft) 31.7 31.7 31.7 31.7

EVAPORATOR FAN Centrifugal Type

Quantity ... Size (in.) 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15 2 ... 20 X 15

Type Drive Belt Belt Belt Belt

Nominal Cfm 8,000 10,000 11,000 12,000

Motor Hp 5 10 15 5 10 15 10 15 20 10 15 20

Motor Frame Size 184T 215T 254T 184T 215T 254T 215T 254T 256T 215T 254T 256T

Motor Bearing Type Ball Ball Ball Ball

Maximum Allowable Rpm 1200 1200 1200 1200

Motor Pulley Pitch Diameter (in.) 4.8 4.4 5.7 4.8 6.1 5.5 4.4 4.9 5.9 4.4 5.7 5.9

Nominal Motor Shaft Diameter (in.) 1

Fan Pulley Pitch Diameter (in.) 12.4 8.6 9.1 12.4 11.1 8.7 9.4 8.1 8.7 9.5 9.1 8.7

Nominal Fan Shaft Diameter (in.) 1

Belt Quantity 112 1 1 2 2 22222

Belt Type BX56 BX50 5VX530 BX56 5VX570 5VX530 BX50 5VX530 5VX530 BX50 5VX530 5VX530

Belt Length (in.) 56 63 53 56 57 53 50 50 53 50 53 53

Pulley Center Line Distance (in.) 16.0-18.7 15.6-18.4 15.0-17.9 15.6-18.4 15.6-18.4 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9 15.6-18.4 15.0-17.9 15.0-17.9

Factory Speed Setting (rpm) 677 895 1096 677 962 1106 819 1096 1187 884 1096 1187

FURNACE SECTION

Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max.

Rollout Switch Cutout

Temp (F)† 225 225 225 225

Burner Orifice Diameter (in. ...drill size)

Natural Gas Std .111 ... 34 .111 ... 34 .111 ... 34 .111 ... 34

Liquid Propane Alt .089 ... 43 .089 ... 43 .089 ... 43 .089 ... 43

Thermostat Heat Anticipator Setting

Stage 1 (amps) 0.24 0.24 0.24 0.24

Stage 2 (amps) 0.13 0.13 0.13 0.13

Gas Input (Btuh) Stage 1

(Low Heat/High Heat)

262,500/394,000 262,500/394,000 262,500/394,000 262,500/394,000

Stage 2

(Low Heat/High Heat)

350,000/525,000 350,000/525,000 350,000/525,000 350,000/525,000

Efficiency (Steady State) (%) 82 82 82 82

Temperature Rise Range 15-45/35-65 15-45/35-65 15-45/35-65 15-45/35-65

Manifold Pressure (in. wg)

Natural Gas Std 3.5 3.5 3.5 3.5

Liquid Propane Alt 3.5 3.5 3.5 3.5

Gas Valve Quantity 22 22

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426 426

Reset (Auto.) 320 320 320 320

MIXED-AIR FILTERS

Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2 10 ... 20 x 24 x 2

Pleated 5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

OUTDOOR-AIR FILTERS

Quantity...Size (in.)

8...16 x 25 x 2

4...20 x 25 x 2

POWER EXHAUST

Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan

Housing

Motor, Quantity...Hp 4...1

Fan, Diameter...Width (in.) 11 x 10

Al — Aluminum

Cu — Copper

Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont)

LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper

portion.

Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have

intertwined evaporator coils.

†Rollout switch is manual reset.

UNIT 48AJ,AK,AW,AY 035 036 040 041

NOMINAL CAPACITY (tons) 35 35 40

BASE UNIT See Operating Weights Table

OPERATING WEIGHT (lb)

COMPRESSOR

Quantity ... Type (Ckt 1/Ckt 2)

1…SR*812AT,

1…SR*942AT/2…SR*942AT

1…SR*812AT,

1…SR*942AT/2…SR*942AT

2…SR*942AT/2…SM125 2…SR*942AT/2…SM125

Number of Refrigerant Circuits 2222

Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged

REFRIGERANT TYPE R-22

Operating Charge (lb-oz)

Circuit 1 33-0 36-0 36-0 47-0

Circuit 2 38-0 58-0 47-0 47-0

CONDENSER COIL* Internally Enhanced,

″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

Quantity 1222

Rows ... Fins/in. 4 ... 15 2...15/4…15 2 ... 15 / 4 … 15 4...15/4…15

Total Face Area (sq ft) 33.3 66.7 66.7 66.7

CONDENSER FAN Propeller Type

Nominal Cfm 14,500 30,000 30,000 30,000

Quantity... Diameter (in.) 2 ... 30 4...30 4 ... 30 4...30

Motor Hp 1111

EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits

Tube Size (in.)

Rows ... Fins/in. 6 ... 16 4...17 4 ... 16 4...17

Total Face Area (sq ft) 31.3 31.3 31.3 31.3

EVAPORATOR FAN Centrifugal Type

Quantity ... Size (in.) 2 ... 20 X 15 2...20 X 15 2 ... 20 X 15 2...20 X 15

Type Drive Belt Belt Belt Belt

Nominal Cfm 14,000 14,000 16,000 16,000

Motor Hp 15 20 25 15 20 25 15 20 25 15 20 25

Motor Frame Size 254T 256T 284T 254T 256T 284T 254T 256T 284T 254T 256T 284T

Motor Bearing Type Ball Ball Ball Ball

Maximum Allowable Rpm 1300 1300 1300 1300

Motor Pulley Pitch Diameter (in.) 5.15.76.25.35.77.55.35.77.55.35.77.5

Nominal Motor Shaft Diameter (in.) 1

Fan Pulley Pitch Diameter (in.) 8.7 8.7 8.7 9.5 9.5 11.1 9.5 9.5 11.1 9.5 9.5 11.1

Nominal Fan Shaft Diameter (in.) 1

Belt Quantity 222222222222

Belt Type 5VX500 5VX530 5VX550 5VX530 5VX550 5VX590 5VX530 5VX550 5VX590 5VX530 5VX550 5VX590

Belt Length (in.) 50 53 55 53 55 59 53 55 59 53 55 59

Pulley Center Line Distance (in.) 15.0-17.9 15.0-17.9 15.0-17.9 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 15.0-17.9 14.6-17.6 15.0-17.9 15.0-17.9 14.6-17.6

Factory Speed Setting (rpm) 1005 1147 1247 976 1050 1182 976 1050 1182 976 1050 1182

FURNACE SECTION

Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max.

Rollout Switch Cutout

Temp (F)† 225 225 225 225

Burner Orifice Diameter (in ...drill size)

Natural Gas Std .111 ... 34 .120...31 .120 ... 31 .120...31

Liquid Propane Alt .089 ... 43 .096...41 .096 ... 41 .096...41

Thermostat Heat Anticipator Setting

Stage 1 (amps) 0.24 0.1 0.24 0.1

Stage 2 (amps) 0.13 0.1 0.13 0.1

Gas Input (Btuh) Stage 1

(Low Heat/High Heat)

262,500/394,000 300,000/600,000 300,000/600,000 300,000/600,000

Stage 2

(Low Heat/High Heat)

350,000/525,000 400,000/800,000 400,000/800,000 400,000/800,000

Efficiency (Steady State) (%) 82 82 82 82

Temperature Rise Range 15-45/35-65 10-40/30-60 10-40/3 -60 10-40/30-60

Manifold Pressure (in. wg)

Natural Gas Std 3.5 3.5 3.5 3.5

Liquid Propane Alt 3.5 3.5 3.5 3.5

Gas Valve Quantity 2222

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426 426

Reset (Auto.) 320 320 320 320

MIXED-AIR FILTERS

Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 10...20 x 24 x 2

5...20 x 20 x 4

10 ... 20 x 24 x 2 10...20 x 24 x 2

5...20 x 20 x 4

Pleated 5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

OUTDOOR-AIR FILTERS

Quantity...Size (in.)

8...16 x 25 x 2

4...20 x 25 x 2

POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing

Motor, Quantity...Hp 4...1

Fan, Diameter...Width (in.) 11 x 10

Al — Aluminum

Cu — Copper

Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont)

LEGEND *Sizes 020-040: Circuit 1 uses the lower portion of condenser coil, Circuit 2 uses the upper

portion.

Sizes 041-060: Circuit 1 uses the left condenser coil, Circuit 2 the right. All units have

intertwined evaporator coils.

†Rollout switch is manual reset.

UNIT 48AJ,AK,AW,AY 050 051 060

NOMINAL CAPACITY (tons) 50 50 60

BASE UNIT See Operating Weights Table

OPERATING WEIGHT (lb)

COMPRESSOR

Quantity ... Type (Ckt 1/Ckt 2)

2…SM125/1…SM125,

1…SM175

2…SM125/2…SM125

1..SM160,1..SM175/

1..SM160,1..SM175

Number of Refrigerant Circuits 22 2

Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged

REFRIGERANT TYPE R-22

Operating Charge (lb-oz)

Circuit 1 64-4 98-0 81-0

Circuit 2 58-8 98-0 81-0

CONDENSER COIL* Internally Enhanced,

″ Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

Quantity 22 2

Rows ... Fins/in. 4 ... 15 4…15 4…15

Total Face Area (sq ft) 66.7 100 100

CONDENSER FAN Propeller Type

Nominal Cfm 25,600 38,400 38,400

Quantity... Diameter (in.) 4 ... 30 6...30 6 ... 30

Motor Hp 11 1

EVAPORATOR COIL Internally Enhanced Copper Tubes, Aluminum Plate Fins with Intertwined Circuits

Tube Size (in.)

Rows ... Fins/in. 6 ... 16 4...17 4 ... 17

Total Face Area (sq ft) 31.3 48.1 48.1

EVAPORATOR FAN Centrifugal Type

Quantity ... Size (in.) 2 ... 20 X 15 3...20 X 15 3 ... 20 X 15

Type Drive Belt Belt Belt

Nominal Cfm 20,000 20,000 24,000

Motor Hp 20 25 30 20 25 30

(High Eff.)

(Prem. Eff.)

25 30

(High Eff.)

(Prem. Eff.)

Motor Frame Size 256T 284T 286T 256T 284T 286T 324T 324T 284T 286T 324T 324T

Motor Bearing Type Ball Ball Ball

Maximum Allowable Rpm 1300 1200 1200

Motor Pulley Pitch Diameter (in.) 5.7 6.2 6.7 5.9 5.3 5.9 6.5 9.5 5.3 5.9 6.5 9.5

Nominal Motor Shaft Diameter (in.) 1

Fan Pulley Pitch Diameter (in.) 9.5 9.5 9.5 11.1 9.1 9.5 9.5 13.7 9.1 9.5 9.5 13.7

Nominal Fan Shaft Diameter (in.) 1

Belt Quantity 2222333 2 333 2

Belt Type 5VX550 5VX570 5VX570 5VX560 5VX530 5VX550 5VX570 5VX650 5VX530 5VX550 5VX570 5VX650

Belt Length (in.) 55 57 57 56 53 55 57 65 53 55 57 65

Pulley Center Line Distance (in.) 15.0-17.9 14.6-17.6 14.6-17.6 15.0-17.9 15.2-17.5 14.7-17.2 14.2-17.0 14.2-17.0 15.2-17.5 14.7-17.2 14.2-17.0 14.2-17.0

Factory Speed Setting (rpm) 1061 1154 1249 930 1019 1086 1197 1214 1019 1086 1197 1214

FURNACE SECTION

Supply Line Pressure Range 5.0-in. wg min/13.5-in. wg max.

Rollout Switch Cutout

Temp (F)† 225 225 225

Burner Orifice Diameter (in ...drill size)

Natural Gas Std .120 ... 31 .120...31 .120 ... 31

Liquid Propane Alt .096 ... 41 .096...41 .096 ... 41

Thermostat Heat Anticipator Setting

Stage 1 (amps) 0.24 0.1 0.36

Stage 2 (amps) 0.13 0.1 0.13

Gas Input (Btuh) Stage 1

(Low Heat/High Heat)

300,000/600,000 582,000/873,000 582,000/873,000

Stage 2

(Low Heat/High Heat)

400,000/800,000 776,000/1,164,000 776,000/1,164,000

Efficiency (Steady State) (%) 82 82 82

Temperature Rise Range 10-40/30-60 10-40/30-60 10-40/30-60

Manifold Pressure (in. wg)

Natural Gas Std 3.5 3.3 3.3

Liquid Propane Alt 3.5 3.3 3.3

Gas Valve Quantity 23 3

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426

Reset (Auto.) 320 320 320

MIXED-AIR FILTERS

Quantity ... Size (in.) Standard 10 ... 20 x 24 x 2 16...20 x 24 x 2

8...20 x 20 x 4

8...20 x 24 x 4

16 ... 20 x 24 x 2

Pleated 5 ... 20 x 20 x 4

5 ... 20 x 24 x 4

8 ... 20 x 20 x 4

8 ... 20 x 24 x 4

OUTDOOR-AIR FILTERS

Quantity...Size (in.)

8...16 x 25 x 2

4...20 x 25 x 2

12...16 x 25 x 2

6...20 x 25 x 2

POWER EXHAUST Direct Drive, Single-Phase Motors (Factory-Wired for High Speed Operation), Forward-Curved Fan Wheels with Backdraft Dampers on Each Fan Housing

Motor, Quantity...Hp 4...1

11 x 10

6...1

11 x 10 Fan, Diameter...Width (in.)

Al — Aluminum

Cu — Copper

50AJ/AK020 4607 2090 87.7 2227 70.9 1801 42.0 1067

48AJ/AKD020 4697 2131 87.7 2227 71.9 1826 42.5 1080

48AJ/AKE020 4777 2167 87.7 2227 72.8 1849 41.0 1041

50AW/AY020 4685 2125 87.7 2227 70.9 1801 42.0 1067

48AW/AYD020 4737 2149 87.7 2227 71.9 1826 42.5 1080

48AW/AYE020 4817 2185 87.7 2227 72.8 1849 41.0 1041

50AJ/AK025 4680 212387.7 2227 68.0 1727 43.9 1115

48AJ/AKD025 4770 2164 87.7 2227 69.1 1755 44.3 1125

48AJ/AKE025 4850 2200 87.7 2227

69.6

1768 44.6 1133

50AW/AY025 4758 215887.7 2227 68.0 1727 43.9 1115

48AW/AYD025 4810 2182

87.7 2227 69.1 1755 44.3 1125

48AW/AYE025 4890 221887.7 2227 69.6 1768 44.6 1133

50AJ/AK027 4873 2210 87.7 2227 68.0 1727 43.9 1115

48AJ/AKD027 4963 2251 87.7 2227

69.1

1755 44.3 1125

48AJ/AKE027 5043 2287 87.7 2227 69.6 1768 44.6 1133

50AW/AY027 4951 2246 87.7 2227 68.0 1727 43.9 1115

48AW/AYD027 5003 2269 87.7 2227 69.1 1755 44.3 1125

48AW/AYE027 5083 2306 87.7 2227 69.6 1768 44.6 1133

50AJ/AK030 5023 227887.7 2227 68.0 1727 43.6 1107

48AJ/AKD030 5113 2319 87.7 2227 69.1 1755 44.0 111

48AJ/AKE030 5193 2356 87.7 2227 69.6 1768 44.3 1125

50AW/AY030 5101 2314 87.7 2227 68.0 1727 43.6 1107

48AW/AYD030 5153 2337 87.7 2227 69.1 1755 44.0 1118

48AW/AYE030 5233 2374 87.7 2227 69.6 1768 44.3 1125

50AJ/AK035 5229 2372 87.7 2227 68.3 173546.5 1181

48AJ/AKD035 5434 2465 87.7 2227 69.4 1763 46.9 1191

48AJ/AKE035 5594 2537 87.7 2227 70.0 1778 47.2 1199

50AW/AY035 5422 2459 87.7 2227 68.3

173546.5 1181

48AW/AYD035 5474 2483 87.7 2227 69.4 1763 46.9 1191

48AW/AYE0355634 2556 87.7 2227 70.0 1778 47.2 1199

50AJ/AK036 5609 2544 87.7 2227 93.4 2372 45.3 1152

48AJ/AKD036 5814 2637 87.7 2227 94.8 2409 45.8 1163

48AJ/AKE036 5974 2710 87.7 2227 96.3 2446 46.1 1172

50AW/AY0365802 2632 87.7 2227 93.3 2370 45.4 1153

48AW/AYD036 5854 2655 87.7 2227 94.8 2408 45.8 1163

48AW/AYE0

36 6014 272887.7 2227 96.3 2446 46.1 1172

50AJ/AK040 5769 2617 87.7 2227 90.8 2306 46.5 1181

48AJ/AKD040 5974 2710 87.7 2227 92.3 2344 46.9 1191

48AJ/AKE040

6134

2782 87.7 2227 93.8 2383 47.2 1199

50AW/AY040 5962 2704 87.7 2227 90.8 2306 46.5 1181

48AW/AYD040 6014 2728 87.7 2227 92.3 2344 46.9 1191

48AW/AYE040 6174 2801 87.7 2227 93.8 2383 47.2 1199

50AJ/AK041 5885 2669 87.7 2227 89.0 2261 45.6 1158

48AJ/AKD041 6090 2762 87.7 2227 90.5 2300 46.0 1169

48AJ/AKE041 6250 2835 87.7 2227 92.1 2338 46.3 1177

50AW/AY041 6078 2757 87.7 2227 89.1 2262 45.6 1159

48AW/AYD041 61302781 87.7 2227 90.6 2300 46.0 1169

48AW/AYE041 6290 285387.7 2227 92.1 233946.3 11 77

50AJ/AK050 6338 2875 87.7 2227 89.2 2266 46.1 1171

48AJ/AKD050 6543 296887.7 2227 90.7 2304 46.5 1181

48AJ/AKE050 6703 3040 87.7 2227 92.2 2342 46.8 11 89

50AW/AY050 6531 2962 87.7 2227 89.2 2266 46.1 1171

48AW/AYD050 6583 2986 87.7 2227 90.7 2304 46.5 1181

48AW/AYE050 67433059 87.7 2227 92.2 2342 46.8 1189

50AJ/AK051 8544 38

76 161.7 4106 126.0 3200 44.6 1133

48AJ/AKD051 8674 3935 161.7 4106 133.2 3383 46.6 1185

48AJ/AKE051 8914 4043 161.7 4106 140.2 3562 48.7 1237

50AW/AY051 8759 3973 161.7 4106 125.9 3198 44.6 1133

48AW/AYD051 8714 3953 161.7 4106 133.2 3382 46.6 1185

48AW/AYE051 8964 4066 161.7 4106 140.2 3562 48.7 1237

50AJ/AK060 8708 3950 161.7 4106 123.6 3139 44.6 1133

48AJ/AKD060 8838 4009 161.7 4106 130.7 3320 46.6 1184

48AJ/AKE060 9078

4118 161.7 4106 137.7 3498 48.6 1234

50AW/AY060 8923 4047 161.7 4106 123.6 3139 44.6 1133

48AW/AYD060 8878 4027 161.7 4106 130.7 3320 46.6 1184

48AW/AYE060 9128 4140 161.7 4106 137.7 3498 48.6 1234

NOTE: Rig with four cables and spread with two 92 inch (2337 MM) spreader bars.

Maintain a distance of 74 inches (1880 MM) from top of unit to eyehook.

CAUTION - NOTICE TO RIGGERS:

ALL PANELS MUST BE IN PLACE WHEN RIGGING.

CENTER

GRAVITY

WEIGHT BAC

INCHES

MM INCHES

INCHES

NOTE:

Add 312 lb (142 kg) for export crating. (020-035 units)

Add 346 lb (157 kg) for export crating. (036-050 units)

Add 588 lb (266 kg) for export crating. (051 and 060 units)

Add 220 lb (100 kg) for copper condenser coil. (020-035 units)

Add 380 lb (172 kg) for copper condenser coil. (036-050 units)

Add 651 lb (295 kg) for copper condenser coil. (051 and 060 units)

UNIT

Fig. 11 — Rigging Information

a48-8246

Table 2 — Unit Operating Weights

Table 3 — Option and Accessory Weights

Table 4 — Constant Volume Fan Motor Weights

LEGEND

Table 5 — Variable Volume Fan Motor Weights

NOTES:

1. Base unit weight includes outdoor-air hoods. Base unit weight

does NOT include indoor-fan motor. ADD indoor-fan motor,

FIOPs, and accessories for TOTAL operating weight.

2. The VAV motor weights include indoor fan motor and the VFD

(variable frequency drive), VFD transducers, and associated

wiring.

UNIT

BASE UNIT WEIGHTS — lb

020 025 027 030 035 036 040 041 050 051 060

48AJ/AK Low Heat 3842 3915 4032 4182 4435 4815 4975 5091 5446 7224 7388

48AJ/AK High Heat 3922 3995 4112 4262 4595 4975 5135 5251 5606 7464 7628

48AW/AY Low Heat 3882 3955 4072 4222 4475 4855 5015 5131 5486 7264 7428

48AW/AY High Heat 3962 4035 4152 4302 4635 5015 5175 5291 5646 7514 7678

OPTION/

ACCESSORY

OPTION/ACCESSORY WEIGHTS — lb

020 025 027 030 035 036 040 041 050 051 060

Barometric Relief 300 300 300 300 300 300 300 300 300 450 450

Power Exhaust 450 450 450 450 450 450 450 450 450 675 675

Mod. Power Exhaust 500 500 500 500 500 500 500 500 500 725 725

Cu Tubing/Cu Fin Condenser Coil 220 220 220 220 285 380 285 380 380 651 651

Outdoor Air Hood Crate and Packaging

(Less Hoods' Weight)

45 45 45 45 45 45 45 45 45 45 45

(Packaging Only) (Packaging Only)

Outdoor Air Hoods/Filters 170 170 170 170 170 170 170 170 170 255 255

Hail Guard 73 73 73 73 73 146 146 146 146 219 219

Roof Curb (14-in.) 365 365 365 365 410 410 410 410 410 540 585

CV MOTOR WEIGHTS — lb

MOTOR

UNIT

VOLTAGE

HIGH

EFFICIENCY

IFM

PREMIUM

EFFICIENCY

IFM

230/460 78 94

575 78 92

230/460 118 164

575 118 156

230/460 150 217

575 150 220

230/460 212 250

575 212 258

230/460 240 309

575 240 319

230/460 283 355

575 283 359

230/460 372 415

575 372 410

Cu — Copper

CV — Constant Volume

FIOP — Factory-Installed Option

HP — Horsepower

IFM — Indoor Fan Motor

VAV — Variable Air Volume

VFD — Variable Frequency Drive

VAV MOTOR WEIGHTS — lb

MOTOR

UNIT

VOLTAGE

HIGH

EFFICIENCY

IFM

PREMIUM

EFFICIENCY

IFM

230/460 125 141

575 163 177

230/460 204 250

575 204 242

230/460 238 305

575 240 310

230/460 348 386

575 304 350

230/460 377 446

575 375 454

230/460 480 552

575 418 494

230/460 637 680

575 587 625

LEGEND AND NOTES FOR TABLES 2-5

Table 6 — Evaporator Fan Motor Data

NOTES:

1. Motor shaft speed is 1750 rpm. The fan shaft diameter is 1

inches.

2. All indoor fan motors meet the minimum efficiency requirements

as established by the Energy Policy Act of 1992 (EPACT), effective

October 24, 1997.

UNIT

SIZE

48AJ,AK,

AW,AY

MOTOR

SHAFT DIA.

(in.)

FAN

SHAFT

SPEED

(rpm)

MOTOR

SHEAVE

(P/N)

MOTOR

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.)

FAN

SHEAVE

(P/N)

FAN

SHEAVE

PITCH

DIAMETER

(in.)

BUSHING

DIAMETER

(in.)

BELT

(Quantity)

(P/N)

BELT

TENSION

(lb at .25 in.)

020

5 1.125 677 BK55 4.8 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 8

10 1.375 895 2BK50 4.4 NONE - 1.375 2B5V86 8.6 B - 1.9375 BX50 8

15 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 9

025

5 1.125 677 BK55 4.8 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 8

10 1.375 962 1B5V60 6.1 H - 1.375 1B5V110 11.1 B - 1.9375 5VX570 11

15 1.625 1106 2B5V54 5.5 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 9

027

10 1.375 819 2BK50 4.4 NONE - 1.375 2B5V94 9.4 B - 1.9375 (2) BX50 8

15 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 10

20 1.625 1187 2B5V58 5.9 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 11

030

10 1.375 884 2BK50 4.4 H - 1.375 2B5V94 9.5 B - 1.9375 (2) BX50 8

15 1.625 1096 2B5V56 5.7 B - 1.625 2B5V90 9.1 B - 1.9375 (2) 5VX530 9

20 1.625 1187 2B5V58 5.9 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 11

035

15 1.625 1005 2B5V50 5.1 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX500 9

20 1.625 1147 2B5V56 5.7 B - 1.625 2B5V86 8.7 B - 1.9375 (2) 5VX530 10

25 1.875 1247 2B5V62 6.2 B - 1.875 2B5V86 8.7 B - 1.9375 (2) 5VX530 11

036

15 1.625 976 2B5V52 5.3 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX530 10

20 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 11

25 1.875 1182 2B5V74 7.5 B - 1.875 2B5V110 11.1 B - 1.9375 (2) 5VX590 11

040

15 1.625 976 2B5V52 5.3 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX530 10

20 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 11

25 1.875 1182 2B5V74 7.5 B - 1.875 2B5V110 11.1 B - 1.9375 (2) 5VX590 11

041

15 1.625 976 2B5V52 5.3 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX530 10

20 1.625 1050 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 11

25 1.875 1182 2B5V74 7.5 B - 1.875 2B5V110 11.1 B - 1.9375 (2) 5VX590 11

050

20 1.625 1061 2B5V56 5.7 B - 1.625 2B5V94 9.5 B - 1.9375 (2) 5VX550 10

25 1.875 1154 2B5V62 6.2 B - 1.875 2B5V94 9.5 B - 1.9375 (2) 5VX570 11

30 1.875 1247 2B5V66 6.7 B - 1.875 2B5V94 9.5 B - 1.9375 (2) 5VX570 13

051

20 1.625 930 2B5V58 5.9 B - 1.625 2B5V110 11.1 B - 1.9375 (2) 5VX560 11

25 1.875 1019 3B5V52 5.3 B - 1.875 3B5V90 9.1 B - 1.9375 (3) 5VX530 12

30 1.875 1086 3B5V58 5.9 B - 1.875 3B5V94 9.5 B - 1.9375 (3) 5VX550 12

40 High 2.125 1197 3B5V64 6.5 B - 2.125 3B5V94 9.5 B - 1.9375 (3) 5VX570 14

40 Prem. 2.125 1214 2B5V94 9.5 B - 2.125 2B5V136 13.7 B - 1.9375 (2) 5VX650 15

060

25 1.875 1019 3B5V52 5.3 B - 1.875 3B5V90 9.1 B - 1.9375 (3) 5VX530 12

30 1.875 1086 3B5V58 5.9 B - 1.875 3B5V94 9.5 B - 1.9375 (3) 5VX550 12

40 High 2.125 1197 3B5V64 6.5 B - 2.125 3B5V94 9.5 B - 1.9375 (3) 5VX570 14

40 Prem. 2.125 1214 2B5V94 9.5 B - 2.125 2B5V136 13.7 B - 1.9375 (2) 5VX650 15

Fig. 12 — Air Distribution — Thru-the-Bottom

Fig. 13 — Air Distribution — Thru-the-Side

a48-8241

a48-8242

Step 5 — Install Flue Hood

48AJ,AK,AW,AY020-050 UNITS — Flue hood is shipped

inside gas section of unit. To install, secure flue hood to access

panel. See Fig. 14.

48AJ,AK,AW,AY051 AND 060 UNITS — Flue hood and

wind baffle are shipped inside gas section of unit. To install, se-

cure flue hood to access panel. Install the two pieces of the

wind baffle over the flue hood. See Fig. 15.

NOTE: When properly installed, flue hood will line up with

combustion fan housing. See Fig. 16.

Step 6 — Trap Condensate Drain — See Fig. 4-9

for drain location. Condensate drain is open to atmosphere and

must be trapped. Install a trapped drain at the drain location.

One 1-in. FPT coupling is provided inside the unit evaporator

section for condensate drain connection. A trap at least 4-in.

deep must be used. See Fig. 17. Trap must be installed to pre-

vent freeze-up.

Condensate pans are sloped so that water will completely

drain from the condensate pan to comply with indoor air quali-

ty guidelines. The condensate drain pans are not insulated.

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 Na-

tional Fuel Gas Code, ANSI Z223.1.

Install manual gas shutoff valve with a

-in. NPT pressure

tap for test gage connection at unit. Field gas piping must in-

clude sediment trap and union. See Fig. 18. An

-in. NPT is

also located on the gas manifold adjacent to the gas valve.

WARNING

Do not pressure test gas supply while connected to unit.

Always disconnect union before servicing. Serious injury

could result.

FLUE HOOD

GAS SECTION

ACCESS PANEL

WIND

BAFFLE

TOP VIEW SIDE VIEW

Fig. 14 — Flue Hood Location

(48AJ,AK,AW,AY020-050 Units)

Fig. 15 — Flue Hood Location

(48AJ,AK,AW,AY051 and 060 Units)

a48-3712

a48-4076

Fig. 16 — Combustion Fan Housing Location

(48AJ,AK,AW,AY020-050 Shown)

a48-3823

Fig. 17 — Condensate Drain Trap Piping Details

(Typical Roof Curb or Slab Mount Shown)

a48-3714

Size gas-supply piping for 0.5-in. wg maximum pressure

drop. Do not use supply pipe smaller than unit gas connection.

OPTIONAL STAGED GAS UNITS — See Table 7 for staged

gas information. Staging pattern is selected during controls

start-up.

For complete information and service instructions for

Staged Gas Control Units, see Control Operation and Trouble-

shooting literature.

Table 7 — 48A Series Staged Gas Control

Step 8 — Make Electrical Connections

POWER WIRING — Units are factory wired for the voltage

shown on the unit nameplate.

Provide a unit safety disconnect switch in the main power

supply to each unit (see Fig. 19). Select switch size and mount-

ing location in accordance with applicable local codes or

National Electrical Code (NEC). If combining the functions of

safety disconnect with maximum overcurrent protection

(MOCP) fuses (“fused disconnect”), coordinate safety switch

size with MOCP size data as marked on unit informative plate.

Unit may be equipped with optional factory-installed non-

fused disconnect switch (see Fig. 19). Provide maximum

overcurrent protection devices (fuses or HACR breakers, per

local codes) in branch circuit wiring remote from unit. Observe

requirements of NEC Article 440. Install service switch

upstream of remote fuses if required.

The main power terminal block is suitable for use with

aluminum or copper wire. See Fig. 19. Units have circuit

breakers for compressors, fan motors, and control circuit. The

unit must be electrically grounded in accordance with local

codes, or in absence of local codes, with NEC, ANSI C1-latest

year.

FIELD POWER SUPPLY — Unit is factory wired for volt-

age shown on unit nameplate. See Tables 8A and 8B for elec-

trical data.

Field wiring can be brought into the unit from bottom

(through basepan and roof curb) or through side of unit (corner

post next to control box).

A 3

-in. NPT coupling for field power wiring and a

-in.

NPT coupling for 24-v control wiring are provided in basepan.

In the side post, there are two 2

-in. (48A020-035) or 3-in.

(48A036-060) knockouts for the field power wiring. See

Fig. 4-9. If control wiring is to be brought in through the side of

unit, a

-in. diameter hole is provided in the condenser side

post next to the control box.

Do not route control wiring in the same conduit as power

wiring.

If disconnect box is mounted to corner post, be careful not

to drill or screw into the condenser coil.

IMPORTANT: Natural gas pressure at unit gas connection

must not be less than 5 in. wg or greater than 13.5 in. wg.

MODEL NUMBER POSITION

NUMBER OF

STAGES

HEAT SIZE

5 6,7,8

020

025

027

030

035

036

040

041

050

5 stages

Low

035

036

040

041

050

High

020

025

027

030

7 stages High

T 051,060 9 stages High

S 051,060 11 stages Low

Fig. 18 — Field Gas Piping

a48-2524

FIELD SUPPLIED

DISCONNECT PER NEC

FIELD

POWER

SUPPLY

TB1

EQUIP GND

FIELD POWER WIRING

GND

OPTIONAL

FACTORY-INSTALLED

DISCONNECT

FIELD-INSTALLED DISCONNECT

FACTORY-INSTALLED DISCONNECT

LEGEND

GND — Ground

NEC — National Electrical Code

TB — Terminal Block

Fig. 19 — Field Power Wiring Connections

a48-6977

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Carrier 48AJ User manual

Brand: Carrier

Model: 48AJ

Category: Split-system air conditioners

Type: User manual

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Carrier 48AJ User manual

Carrier 48AJ User manual

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