Carrier Weathermaker 48Aj Users Manual 48a 7si

WEATHERMAKER 48AJ 48a-7si

48AJ to the manual 975003af-2aee-4ff9-b5c1-b978d00e0156

2015-01-24

: Carrier Carrier-Weathermaker-48Aj-Users-Manual-310531 carrier-weathermaker-48aj-users-manual-310531 carrier pdf

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Page Count: 36

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 21/2 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, 3/8

″ 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.) 3/83/83/83/8

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.) 11/813/815/811/813/815/813/815/815/813/815/815/8

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.) 115/16 115/16 115/16 115/16

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 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, 3/8

″ 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.) 1/21/21/21/2

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.) 15/815/817/815/815/817/815/815/817/815/815/817/8

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.) 115/16 115/16 115/16 115/16

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, 3/8

″ 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.) 1/21/21/2

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 40

(High Eff.)

(Prem. Eff.) 25 30 40

(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.) 15/817/817/815/817/817/821/821/817/817/821/821/8

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.) 115/16 115/16 115/16

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 213187.7 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 44.31125

48AJ/AKE025 4850 2200 87.7 2227 69.6 176844.6 1133

50AW/AY025 4758 215887.7 2227 68.0 1727 43.9 1115

48AW/AYD025 4810 2182 87.7 2227 69.1 1755 44.31125

48AW/AYE025 4890 221887.7 2227 69.6 176844.6 1133

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

48AJ/AKD027 4963 2251 87.7 2227 69.1 1755 44.31125

48AJ/AKE027 5043 228787.7 2227 69.6 176844.6 1133

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

48AW/AYD027 50032269 87.7 2227 69.1 1755 44.31125

48AW/AYE027 5083 2306 87.7 2227 69.6 176844.6 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 1118

48AJ/AKE030 5193 2356 87.7 2227 69.6 176844.31125

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

48AW/AYD030 51532337 87.7 2227 69.1 1755 44.0 1118

48AW/AYE030 5233 2374 87.7 2227 69.6 176844.31125

50AJ/AK035 5229 2372 87.7 2227 68.3 173546.5 1181

48AJ/AKD035 5434 2465 87.7 2227 69.4 176346.9 1191

48AJ/AKE035 5594 2537 87.7 2227 70.0 177847.2 1199

50AW/AY035 5422 2459 87.7 2227 68.3 173546.5 1181

48AW/AYD035 5474 2483 87.7 2227 69.4 176346.9 1191

48AW/AYE0355634 2556 87.7 2227 70.0 177847.2 1199

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

48AJ/AKD036 5814 263787.7 2227 94.8 2409 45.8 1163

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

50AW/AY0365802 263287.7 2227 93.3 2370 45.4 1153

48AW/AYD036 5854 2655 87.7 2227 94.8 240845.8 1163

48AW/AYE036 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 278287.7 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 283587.7 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 1177

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 1189

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 3876 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 4043161.7 4106 140.2 3562 48.7 1237

50AW/AY051 8759 3973161.7 4106 125.9 319844.6 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 4118161.7 4106 137.7 349848.6 1234

50AW/AY060 89234047 161.7 4106 123.6 3139 44.6 1133

48AW/AYD060 88784027 161.7 4106 130.7 3320 46.6 1184

48AW/AYE060 91284140 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

LB KG INCHESMM INCHESMM INCHESMM

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

5230/460 78 94

575 78 92

10 230/460 118 164

575 118 156

15 230/460 150 217

575 150 220

20 230/460 212 250

575 212 258

25 230/460 240 309

575 240 319

30 230/460 283 355

575 283 359

40 230/460 372 415

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

5230/460 125 141

575 163 177

10 230/460 204 250

575 204 242

15 230/460 238 305

575 240 310

20 230/460 348 386

575 304 350

25 230/460 377 446

575 375 454

30 230/460 480 552

575 418 494

40 230/460 637 680

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 115/16 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 1/8-in. NPT pressure

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

clude sediment trap and union. See Fig. 18. An 1/8-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 31/2-in. NPT coupling for field power wiring and a 3/4-in.

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

In the side post, there are two 21/2-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 7/8-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

11 21

TB1

EQUIP GND

FIELD POWER WIRING

11 21

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

Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet

See Legend and Notes on page 24.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) MCA MOCP*

020

208 187 229 23 184 23 184 23 184 — — 2 6.5

(ea)

516.7 — 104.5 125

23.6 128.1 150

10 30.8 — 120.5 150

23.6 144.1 150

15 46.2 — 139.8 175

23.6 163.4 200

230 207 253 23 184 23 184 23 184 — — 2 6.6

(ea)

515.2 — 103.2 125

23.6 126.8 150

10 28.0 — 117.2 125

23.6 140.8 150

15 42.0 — 134.7 175

23.6 158.3 200

460 414 508 10.2 90 10.2 90 10.2 90 — — 2 3.3

(ea)

57.6 —47.450

12.6 60.0 70

10 14.0 —54.760

12.6 67.3 80

15 21.0 —63.580

12.6 76.1 90

575 518 632 9 73 9 73 9 73 — — 2 2.6

(ea)

56.1 —40.650

9.6 50.2 60

10 11.0 —46.050

9.6 55.6 60

15 17.0 —53.570

9.6 63.1 80

025

208 187 229 21.8 184 25.6 190 25.6 190 — — 2 6.5

(ea)

516.7 — 109.1 125

23.6 132.7 150

10 30.8 — 124.5 150

23.6 148.1 175

15 46.2 — 143.8 175

23.6 167.4 200

230 207 253 21.8 184 25.6 190 25.6 190 — — 2 6.6

(ea)

515.2 — 107.8 125

23.6 131.4 150

10 28.0 — 121.2 125

23.6 144.8 150

15 42.0 — 138.7 175

23.6 162.3 200

460 414 508 11 90 13.5 95 13.5 95 — — 2 3.3

(ea)

57.6 —55.660

12.6 68.2 80

10 14.0 —62.170

12.6 74.7 80

15 21.0 —70.990

12.6 83.5 100

575 518 632 9 73 10.2 75 10.2 75 — — 2 2.6

(ea)

56.1 —43.350

9.6 52.9 60

10 11.0 —48.450

9.6 58.0 60

15 17.0 —55.970

9.6 65.5 80

027

208 187 229 25.6 190 25.6 190 25.6 190 — — 2 6.5

(ea)

10 30.8 — 128.3 150

23.6 151.9 175

15 46.2 — 147.6 175

23.6 171.2 200

20 59.4 — 164.1 200

23.6 187.7 225

230 207 253 25.6 190 25.6 190 25.6 190 — — 2 6.6

(ea)

10 28.0 — 125.0 150

23.6 148.6 175

15 42.0 — 142.5 175

23.6 166.1 200

20 54.0 — 157.5 200

23.6 181.1 225

460 414 508 13.5 95 13.5 95 13.5 95 — — 2 3.3

(ea)

10 14.0 —64.670

12.6 77.2 90

15 21.0 —73.490

12.6 86.0 100

20 27.0 — 80.9 100

12.6 93.5 110

575 518 632 10.2 75 10.2 75 10.2 75 — — 2 2.6

(ea)

10 11.0 —49.660

12.6 62.6 70

15 17.0 —57.170

12.6 69.7 80

20 22.0 —63.380

12.6 75.9 90

Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)

See Legend and Notes on page 24.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) MCA MOCP*

030

208 187 229 23 184 23 184 21.8 184 21.8 184 2 6.5

(ea)

10 30.8 — 141.1 150

23.6 164.7 175

15 46.2 — 160.4 200

23.6 184.0 225

20 59.4 — 176.9 225

23.6 200.5 250

230 207 253 23 184 23 184 21.8 184 21.8 184 2 6.6

(ea)

10 28.0 — 137.8 150

23.6 161.4 175

15 42.0 — 155.3 175

23.6 178.9 200

20 54.0 — 170.5 200

23.6 193.9 225

460 414 508 10.2 90 10.2 90 11 90 11 90 2 3.3

(ea)

10 14.0 —66.580

12.6 79.1 90

15 21.0 —75.390

12.6 87.9 100

20 27.0 — 82.8 100

12.6 95.4 110

575 518 632 9 73 9 73 9 73 9 73 2 2.6

(ea)

10 11.0 —55.060

12.6 68.0 80

15 17.0 —62.570

12.6 75.1 90

20 22.0 —68.790

12.6 81.3 100

035

208 187 229 21.8 184 25.6 190 25.6 190 25.6 190 2 6.5

(ea)

15 46.2 — 169.4 200

23.6 193.6 225

20 59.4 — 185.9 225

23.6 209.5 250

25 74.8 — 205.1 250

23.6 228.7 300

230 207 253 21.8 184 25.6 190 25.6 190 25.6 190 2 6.6

(ea)

15 42.0 — 164.3 200

23.6 187.9 225

20 54.0 — 179.3 225

23.6 202.9 250

25 68.0 — 196.8 250

23.6 220.4 250

460 414 508 11 90 13.5 95 13.5 95 13.5 95 2 3.3

(ea)

15 21.0 — 84.4 100

12.6 97.0 110

20 27.0 — 91.9 110

12.6 104.5 125

25 34.0 — 100.6 125

12.6 113.2 125

575 518 632 9 73 10.2 75 10.2 75 10.2 75 2 2.6

(ea)

15 17.0 —66.180

12.6 78.7 90

20 22.0 —72.390

12.6 84.9 100

25 27.0 — 78.6 100

12.6 91.2 110

036

208 187 229 21.8 184 25.6 190 25.6 190 25.6 190 4 6.5

(ea)

15 46.2 — 182.4 225

23.6 206.0 250

20 59.4 — 198.9 250

23.6 222.5 250

25 74.8 — 218.1 250

23.6 241.7 300

230 207 253 21.8 184 25.6 190 25.6 190 25.6 190 4 6.6

(ea)

15 42.0 — 177.5 200

23.6 201.1 225

20 54.0 — 192.5 225

23.6 216.1 250

25 68.0 — 210.0 250

23.6 233.6 300

460 414 508 11 90 13.5 95 13.5 95 13.5 95 4 3.3

(ea)

15 21.0 — 91.0 110

12.6 103.6 110

20 27.0 — 98.5 125

12.6 111.1 125

25 34.0 — 107.2 125

12.6 119.8 150

575 518 632 9 73 10.2 75 10.2 75 10.2 75 4 2.6

(ea)

15 17.0 —71.380

9.6 80.9 90

20 22.0 —77.590

9.6 87.1 100

25 27.0 — 83.8 110

9.6 93.4 110

Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)

See Legend and Notes on page 24.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) MCA MOCP*

040

208 187 229 25.6 190 25.6 190 34.3 265 34.3 265 4 6.5

(ea)

15 46.2 — 203.6 225

23.6 227.2 250

20 59.4 — 220.1 250

23.6 243.7 300

25 74.8 — 239.3 300

23.6 262.4 300

230 207 253 25.6 190 25.6 190 34.3 265 34.3 265 4 6.6

(ea)

15 42.0 — 198.7 225

23.6 222.3 250

20 54.0 — 213.7 250

23.6 237.3 250

25 68.0 — 231.2 250

23.6 254.8 300

460 414 508 13.5 95 13.5 95 16 120 16 120 4 3.3

(ea)

15 21.0 — 98.5 110

12.6 111.1 125

20 27.0 — 106.0 125

12.6 118.6 125

25 34.0 — 114.7 125

12.6 127.3 150

575 518 632 10.2 75 10.2 75 12.9 80 12.9 80 4 2.6

(ea)

15 17.0 —77.990

12.6 90.5 100

20 22.0 — 84.1 100

12.6 96.7 110

25 27.0 — 90.4 110

12.6 103.0 125

041

208 187 229 25.6 190 25.6 190 34.3 265 34.3 265 4 6.5

(ea)

15 46.2 — 203.6 225

23.6 227.2 250

20 59.4 — 220.1 250

23.6 243.7 300

25 74.8 — 239.3 300

23.6 262.9 300

230 207 253 25.6 190 25.6 190 34.3 265 34.3 265 4 6.6

(ea)

15 42.0 — 198.7 225

23.6 222.3 250

20 54.0 — 213.7 250

23.6 237.3 250

25 68.0 — 231.2 250

23.6 254.8 300

460 414 508 13.5 95 13.5 95 16 120 16 120 4 3.3

(ea)

15 21.0 — 98.5 110

12.6 111.1 125

20 27.0 — 106.0 125

12.6 118.6 125

25 34.0 — 114.7 125

12.6 127.3 150

575 518 632 10.2 75 10.2 75 12.9 80 12.9 80 4 2.6

(ea)

15 17.0 —77.990

9.6 87.5 100

20 22.0 — 84.1 100

9.6 93.7 110

25 27.0 — 90.4 110

9.6 100.0 125

050

208 187 229 34.3 265 34.3 265 34.3 265 47 380 4 6.5

(ea)

20 59.4 — 250.2 300

23.6 273.8 300

25 74.8 — 269.4 300

23.6 293.0 350

30 88.0 — 285.9 350

23.6 309.5 350

230 207 253 34.3 265 34.3 265 34.3 265 47 380 4 6.6

(ea)

20 54.0 — 243.8 250

23.6 267.4 300

25 68.0 — 261.3 300

23.6 284.9 300

30 80.0 — 276.3 350

23.6 299.9 350

460 414 508 16 120 16 120 16 120 22.4 175 4 3.3

(ea)

20 27.0 — 117.4 125

12.6 130.0 150

25 34.0 — 126.1 150

12.6 138.7 150

30 40.0 — 133.6 150

12.6 146.2 175

575 518 632 12.9 80 12.9 80 12.9 80 18.6 140 4 2.6

(ea)

20 22.0 — 95.2 110

12.6 107.8 125

25 27.0 — 101.5 125

12.6 114.1 125

30 32.0 — 107.7 125

12.6 120.3 150

Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)

LEGEND

*Fuse or HACR circuit breaker per NEC.

NOTES:

1. In compliance with NEC requirements for multimotor and combination

load equipment (refer to NEC Articles 430 and 440), the overcurrent

protective device for the unit shall be fuse or HACR breaker. The

Canadian units may be fuse or circuit breaker.

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is

greater than 2%. Use the following formula to determine the percent

of voltage imbalance.

% Voltage imbalance

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

= 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 of voltage imbalance.

% Voltage Imbalance = 100 x

= 1.53%

This amount of phase imbalance is satisfactory as it is below the max-

imum allowable 2%.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) MCA MOCP*

051

208 187 229 34.3 265 34.3 265 34.3 265 34.3 265 6 6.5

(ea)

20 59.4 — 250.5 300

35.4 285.9 300

25 74.8 — 269.7 300

35.4 305.1 350

30 88 — 286.2 350

35.4 321.6 400

40 114 — 318.7 400

35.4 354.1 450

230 207 253 34.3 265 34.3 265 34.3 265 34.3 265 6 6.6

(ea)

20 54 — 244.3 250

35.4 279.7 300

25 68 — 261.8 300

35.4 297.2 350

30 80 — 276.8 350

35.4 312.2 350

40 104 — 306.8 400

35.4 342.2 400

460 414 508 16 120 16 120 16 120 16 120 6 3.3

(ea)

20 27 — 117.6 125

18.9 136.5 150

25 34 — 126.3 150

18.9 145.2 175

30 40 — 133.8 150

18.9 152.7 175

40 52 — 148.8 200

18.9 167.7 200

575 518 632 12.9 80 12.9 80 12.9 80 12.9 80 6 2.6

(ea)

20 22 — 94.7 110

14.4 109.1 125

25 27 — 101.0 125

14.4 115.4 125

30 32 — 107.2 125

14.4 121.6 150

40 41 — 118.5 150

14.4 132.9 150

060

208 187 229 40.8 265 47 380 40.8 265 47 380 6 6.5

(ea)

25 75.0 — 308.1 350

35.4 343.5 400

30 88.0 — 324.6 400

35.4 360.0 400

40 114.0 — 357.1 450

35.4 392.5 450

230 207 253 40.8 265 47 380 40.8 265 47 380 6 6.6

(ea)

25 68.0 — 300.2 350

35.4 335.6 350

30 80.0 — 315.2 350

35.4 350.6 400

40 104.0 — 345.2 400

35.4 380.6 450

460 414 508 20.2 135 22.4 175 20.2 135 22.4 175 6 3.3

(ea)

25 34.0 — 147.5 175

18.9 166.4 175

30 40.0 — 155.0 175

18.9 173.9 200

40 52.0 — 170.0 200

18.9 188.9 225

575 518 632 16.6 120 18.6 140 16.6 120 18.6 140 6 2.6

(ea)

25 27.0 — 119.8 125

18.9 138.7 150

30 32.0 — 126.0 150

18.9 144.9 175

40 41.0 — 137.3 175

18.9 156.2 175

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

RLA — Rated Load Amps

= 100 x max voltage deviation from average voltage

average voltage

Average Voltage = 452 + 464 + 455

= 1371

IMPORTANT: If the supply voltage phase imbalance is more than

2%, contact your local electric utility company immediately.

457

Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet

See Legend and Notes on page 28.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST

CONVENIENCE

OUTLET POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) FLA MCA Fuse or

HACR Brkr*

020

208 187 229 23 184 23 184 23 184 — — 2 6.5

(ea)

516.7 — 7.0 111.5 125

23.6 7.0 135.2 150

10 30.8 — 7.0 127.5 150

23.6 7.0 151.1 175

15 46.2 — 7.0 146.8 175

23.6 7.0 170.4 200

230 207 253 23 184 23 184 23 184 — — 2 6.6

(ea)

515.2 — 7.0 110.2 125

23.6 7.0 133.9 150

10 28.0 — 7.0 124.2 150

23.6 7.0 147.8 175

15 42.0 — 7.0 141.7 175

23.6 7.0 165.3 200

460 414 508 10.2 90 10.2 90 10.2 90 — — 2 3.3

(ea)

57.6 — 3.5 50.9 60

12.6 3.5 64.1 70

10 14.0 — 3.5 58.2 70

12.6 3.5 70.8 80

15 21.0 — 3.5 67.0 80

12.6 3.5 79.6 100

575 518 632 9 73 9 73 9 73 — — 2 2.6

(ea)

56.1 — 2.5 43.1 50

9.6 2.5 52.8 60

10 11.0 — 2.5 48.5 50

9.6 2.5 58.1 60

15 17.0 —2.556.0

9.6 2.5 65.6 80

025

208 187 229 21.8 184 25.6 190 25.6 190 — — 2 6.5

(ea)

516.7 — 7.0 116.1 125

23.6 7.0 139.7 150

10 30.8 — 7.0 131.5 150

23.6 7.0 155.1 175

15 46.2 — 7.0 150.8 175

23.6 7.0 174.4 200

230 207 253 21.8 184 25.6 190 25.6 190 — — 2 6.6

(ea)

515.2 — 7.0 114.8 125

23.6 7.0 138.4 150

10 28.0 — 7.0 128.2 150

23.6 7.0 151.8 175

15 42.0 — 7.0 145.7 175

23.6 7.0 169.3 200

460 414 508 11 90 13.5 95 13.5 95 — — 2 3.3

(ea)

57.6 — 3.5 59.1 70

12.6 3.5 71.7 80

10 14.0 — 3.5 65.6 70

12.6 3.5 78.2 90

15 21.0 — 3.5 74.4 90

12.6 3.5 87.0 100

575 518 632 9 73 10.2 75 10.2 75 — — 2 2.6

(ea)

56.9 — 2.5 46.6 50

6.1 2.5 52.7 60

10 11.0 — 2.5 50.9 60

6.1 2.5 57.0 60

15 17.0 — 2.5 58.4 70

6.1 2.5 64.5 80

027

208 187 229 25.6 190 25.6 190 25.6 190 — — 2 6.5

(ea)

10 30.8 — 7.0 135.3 150

23.6 7.0 158.9 175

15 46.2 — 7.0 154.6 200

23.6 7.0 178.2 200

20 59.4 — 7.0 171.1 225

23.6 7.0 194.7 250

230 207 253 25.6 190 25.6 190 25.6 190 — — 2 6.6

(ea)

10 28.0 — 7.0 132.0 150

23.6 7.0 155.6 175

15 42.0 — 7.0 149.5 175

23.6 7.0 173.1 200

20 54.0 — 7.0 164.5 200

23.6 7.0 188.1 225

460 414 508 13.5 95 13.5 95 13.5 95 — — 2 3.3

(ea)

10 14.0 — 3.5 68.1 80

12.6 3.5 80.7 90

15 21.0 — 3.5 76.9 90

12.6 3.5 89.5 110

20 27.0 — 3.5 84.4 110

12.6 3.5 97.0 110

575 518 632 10.2 75 10.2 75 10.2 75 — — 2 2.6

(ea)

10 11.0 — 2.5 52.1 60

9.6 2.5 61.7 70

15 17.0 — 2.5 59.6 70

9.6 2.5 69.2 80

20 22.0 — 2.5 65.8 80

9.6 2.5 75.4 90

Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)

See Legend and Notes on page 28.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST

CONVENIENCE

OUTLET POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) FLA MCA Fuse or

HACR Brkr*

030

208 187 229 23 184 23 184 21.8 184 21.8 184 2 6.5

(ea)

10 30.8 — 7.0 148.1 175

23.6 7.0 171.7 200

15 46.2 — 7.0 167.4 200

23.6 7.0 191.0 225

20 59.4 — 7.0 183.9 225

23.6 7.0 207.5 250

230 207 253 23 184 23 184 21.8 184 21.8 184 2 6.6

(ea)

10 28.0 — 7.0 144.8 150

23.6 7.0 168.4 175

15 42.0 — 7.0 162.3 200

23.6 7.0 185.9 225

20 54.0 — 7.0 177.3 225

23.6 7.0 200.9 250

460 414 508 10.2 90 10.2 90 11 90 11 90 2 3.3

(ea)

10 14.0 — 3.5 70.0 80

12.6 3.5 82.6 90

15 21.0 — 3.5 78.8 90

12.6 3.5 91.4 110

20 27.0 — 3.5 86.3 110

12.6 3.5 98.9 125

575 5186329739739739732 2.6

(ea)

10 11.0 — 2.5 57.5 60

9.6 2.5 67.1 70

15 17.0 — 2.5 65.0 80

9.6 2.5 74.6 90

20 22.0 — 2.5 71.2 90

9.6 2.5 80.8 100

035

208 187 229 21.8 184 25.6 190 25.6 190 25.6 190 2 6.5

(ea)

15 46.2 — 7.0 176.4 200

23.6 7.0 200.0 225

20 59.4 — 7.0 192.9 250

23.6 7.0 216.5 250

25 74.8 — 7.0 212.1 250

23.6 7.0 235.7 300

230 207 253 21.8 184 25.6 190 25.6 190 25.6 190 2 6.6

(ea)

15 42.0 — 7.0 171.3 200

23.6 7.0 194.9 225

20 54.0 — 7.0 186.3 225

23.6 7.0 209.9 250

25 68.0 — 7.0 203.8 250

23.6 7.0 227.4 250

460 414 508 11 90 13.5 95 13.5 95 13.5 95 2 3.3

(ea)

15 21.0 — 3.5 87.9 100

12.6 3.5 100.5 110

20 27.0 — 3.5 95.4 110

12.6 3.5 108.0 125

25 34.0 — 3.5 104.1 125

12.6 3.5 116.7 150

575 518 632 9 73 10.2 75 10.2 75 10.2 75 2 2.6

(ea)

15 17.0 — 2.5 68.6 80

9.6 2.5 78.2 90

20 22.0 — 2.5 74.8 90

9.6 2.5 84.4 100

25 27.0 — 2.5 81.1 100

9.6 2.5 90.7 110

036

208 187 229 21.8 184 25.6 190 25.6 190 25.6 190 4 6.5

(ea)

15 46.2 — 7.0 189.4 225

23.6 7.0 213.0 250

20 59.4 — 7.0 205.9 250

23.6 7.0 229.5 250

25 74.8 — 7.0 225.1 250

23.6 7.0 248.7 300

230 207 253 21.8 184 25.6 190 25.6 190 25.6 190 4 6.6

(ea)

15 42.0 — 7.0 184.5 225

23.6 7.0 208.1 250

20 54.0 — 7.0 199.5 250

23.6 7.0 223.1 250

25 68.0 — 7.0 217.0 250

23.6 7.0 240.6 300

460 414 508 11 90 13.5 95 13.5 95 13.5 95 4 3.3

(ea)

15 21.0 — 3.5 94.5 110

12.6 3.5 107.1 125

20 27.0 — 3.5 102.0 125

12.6 3.5 114.6 125

25 34.0 — 3.5 110.7 125

12.6 3.5 123.3 150

575 518 632 9 73 10.2 75 10.2 75 10.2 75 4 2.6

(ea)

15 17.0 — 2.5 73.8 90

9.6 2.5 83.4 100

20 22.0 — 2.5 80.0 100

9.6 2.5 89.6 110

25 27.0 — 2.5 86.3 110

9.6 2.5 95.9 110

Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)

See Legend and Notes on page 28.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST

CONVENIENCE

OUTLET POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) FLA MCA Fuse or

HACR Brkr*

040

208 187 229 25.6 190 25.6 190 34.3 265 34.3 265 2 6.5

(ea)

15 46.2 — 7.0 210.6 250

23.6 7.0 234.2 250

20 59.4 — 7.0 227.1 250

23.6 7.0 250.7 300

25 74.8 — 7.0 246.3 300

23.6 7.0 269.9 300

230 207 253 25.6 190 25.6 190 34.3 265 34.3 265 2 6.6

(ea)

15 42.0 — 7.0 205.7 225

23.6 7.0 229.3 250

20 54.0 — 7.0 220.7 250

23.6 7.0 244.3 250

25 68.0 — 7.0 238.2 300

23.6 7.0 261.8 300

460 414 508 13.5 95 13.5 95 16.0 120 16.0 120 2 3.3

(ea)

15 21.0 — 3.5 102.0 110

12.6 3.5 114.6 125

20 27.0 — 3.5 109.5 125

12.6 3.5 122.1 125

25 34.0 — 3.5 118.2 150

12.6 3.5 130.8 150

575 518 632 10.2 75 10.2 75 12.9 80 12.9 80 2 2.6

(ea)

15 17.0 — 2.5 80.4 90

9.6 2.5 90.0 100

20 22.0 — 2.5 86.6 100

9.6 2.5 96.2 110

25 27.0 — 2.5 92.9 110

9.6 2.5 102.5 125

041

208 187 229 25.6 190 25.6 190 34.3 265 34.3 265 4 6.5

(ea)

15 46.2 — 7.0 210.6 250

23.6 7.0 234.2 250

20 59.4 — 7.0 227.1 250

23.6 7.0 250.7 300

25 74.8 — 7.0 246.3 300

23.6 7.0 269.9 300

230 207 253 25.6 190 25.6 190 34.3 265 34.3 265 4 6.6

(ea)

15 42.0 — 7.0 205.7 225

23.6 7.0 229.3 250

20 54.0 — 7.0 220.7 250

23.6 7.0 244.3 250

25 68.0 — 7.0 238.2 300

23.6 7.0 261.8 300

460 414 508 13.5 95 13.5 95 16 120 16 120 4 3.3

(ea)

15 21.0 — 3.5 102.0 110

12.6 3.5 114.6 125

20 27.0 — 3.5 109.5 125

12.6 3.5 122.1 125

25 34.0 — 3.5 118.2 150

12.6 3.5 130.8 150

575 518 632 10.2 75 10.2 75 12.9 80 12.9 80 4 2.6

(ea)

15 17.0 — 2.5 80.4 90

9.6 2.5 90.0 100

20 22.0 — 2.5 86.6 100

9.6 2.5 96.2 110

25 27.0 — 2.5 92.9 110

9.6 2.5 102.5 125

050

208 187 229 34.3 265 34.3 265 34.3 265 47 380 4 6.5

(ea)

20 59.0 — 7.0 257.2 300

23.6 7.0 280.8 300

25 75.0 — 7.0 276.4 350

23.6 7.0 300.0 350

30 88.0 — 7.0 292.9 350

23.6 7.0 316.5 400

230 207 253 34.3 265 34.3 265 34.3 265 47 380 4 6.6

(ea)

20 54.0 — 7.0 250.8 300

23.6 7.0 274.4 300

25 68.0 — 7.0 268.3 300

23.6 7.0 291.9 350

30 80.0 — 7.0 283.3 350

23.6 7.0 306.9 350

460 414 508 16 120 16 120 16 120 22.4 175 4 3.3

(ea)

20 27.0 — 3.5 120.9 125

12.6 3.5 133.5 150

25 34.0 — 3.5 129.6 150

12.6 3.5 142.2 175

30 40.0 — 3.5 137.1 175

12.6 3.5 149.7 175

575 518 632 12.9 80 12.9 80 12.9 80 18.6 140 4 2.6

(ea)

20 22.0 — 2.5 97.7 110

9.6 2.5 107.3 125

25 27.0 — 2.5 104.0 125

9.6 2.5 113.6 125

30 32.0 — 2.5 110.2 125

9.6 2.5 119.8 150

Table 8B — Electrical Data — 48AJ,AK,AW,AY Units with Convenience Outlet (cont)

LEGEND

*Fuse or HACR circuit breaker per NEC.

NOTES:

1. In compliance with NEC requirements for multimotor and combination load

equipment (refer to NEC Articles 430 and 440), the overcurrent protective

device for the unit shall be fuse or HACR breaker. The Canadian units may

be fuse or circuit breaker.

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is

greater than 2%. Use the following formula to determine the percent of volt-

age imbalance.

% Voltage imbalance

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

= 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 of voltage imbalance.

% Voltage Imbalance = 100 x

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum

allowable 2%.

UNIT

SIZE

48A

VOLTAGE

3 PH, 60 Hz

VOLTAGE

RANGE

COMPRESSOR CONDENSER

FAN MOTOR

EVAPORATOR

FAN MOTOR

POWER

EXHAUST

CONVENIENCE

OUTLET POWER SUPPLY

Cir A, No. 1 Cir A, No. 2 Cir B, No. 1 Cir B, No. 2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA Qty FLA Hp FLA FLA (total) FLA MCA Fuse or

HACR Brkr*

051

208 187 229 34.3 265 34.3 265 34.3 265 34.3 265 6 6.5

(ea)

20 59.4 — 7.0 257.5 300

35.4 7.0 292.9 350

25 74.8 — 7.0 276.7 350

35.4 7.0 312.1 350

30 88 — 7.0 293.2 350

35.4 7.0 328.6 400

40 114 — 7.0 325.7 400

35.4 7.0 361.1 450

230 207 253 34.3 265 34.3 265 34.3 265 34.3 265 6 6.6

(ea)

20 54 — 7.0 251.3 300

35.4 7.0 286.7 300

25 68 — 7.0 268.8 300

35.4 7.0 304.2 350

30 80 — 7.0 283.8 350

35.4 7.0 319.2 350

40 104 — 7.0 313.8 400

35.4 7.0 349.2 450

460 414 508 16 120 16 120 16 120 16 120 6 3.3

(ea)

20 27 — 3.5 121.1 125

18.9 3.5 140.0 150

25 34 — 3.5 129.8 150

18.9 3.5 148.7 175

30 40 — 3.5 137.3 175

18.9 3.5 156.2 175

40 52 — 3.5 152.3 200

18.9 3.5 171.2 200

575 518 632 12.9 80 12.9 80 12.9 80 12.9 80 6 2.6

(ea)

20 22 — 2.5 97.2 110

14.4 2.5 111.6 125

25 27 — 2.5 103.5 125

14.4 2.5 117.9 125

30 32 — 2.5 109.7 125

14.4 2.5 124.1 150

40 41 — 2.5 121.0 150

14.4 2.5 135.4 175

060

208 187 229 40.8 265 47 380 40.8 265 47 380 6 6.5

(ea)

25 75.0 — 7.0 315.1 350

35.4 7.0 350.5 400

30 88.0 — 7.0 331.6 400

35.4 7.0 367.0 450

40 114.0 — 7.0 364.1 450

35.4 7.0 399.5 500

230 207 253 40.8 265 47 380 40.8 265 47 380 6 6.6

(ea)

25 68.0 — 7.0 307.2 350

35.4 7.0 342.6 400

30 80.0 — 7.0 322.2 400

35.4 7.0 357.6 400

40 104.0 — 7.0 352.2 450

35.4 7.0 387.6 450

460 414 508 20.2 135 22.4 175 20.2 135 22.4 175 6 3.3

(ea)

25 34.0 — 3.5 151.0 175

18.9 3.5 169.9 200

30 40.0 — 3.5 158.5 175

18.9 3.5 177.4 200

40 52.0 — 3.5 173.5 225

18.9 3.5 192.4 225

575 518 632 16.6 120 18.6 140 16.6 120 18.6 140 6 2.6

(ea)

25 27.0 — 2.5 122.3 125

14.4 2.5 136.7 150

30 32.0 — 2.5 128.5 150

14.4 2.5 142.9 150

40 41.0 — 2.5 139.8 175

14.4 2.5 154.2 175

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

NEC — National Electrical Code

RLA — Rated Load Amps

= 100 x max voltage deviation from average voltage

average voltage

Average Voltage = 452 + 464 + 455

= 1371

IMPORTANT: If the supply voltage phase imbalance is more than 2%,

contact your local electric utility company immediately.

457

Routing Through Bottom of Unit — If wiring is brought in

through bottom of unit, use field-supplied watertight conduit to

route power wiring through the 31/2-in. diameter hole provided

in the unit basepan.

Install conduit connector in unit basepan as shown in

Fig. 4-9. Route power and ground lines through connector to

terminal connections in unit control box as shown on unit

wiring diagram and Fig. 19.

Use strain relief going into control box through 35/8-in.

diameter hole provided. After wires are in unit control box,

connect to power terminal block (see Power Wiring section on

page 20).

Low-voltage wiring must be run in watertight conduit from

the basepan to control box and through 7/8-in. diameter hole

provided in bottom of unit control box. Field-supplied strain

relief must be used going into the box. After wiring is in

control box, make connections to proper terminals on terminal

blocks (see Field Control Wiring section on this page).

Routing Through Side of Unit — Route power wiring in

field-supplied watertight conduit into unit through 21/2-in. (siz-

es 020-035) or 3-in. (sizes 036-060) hole.

Use field-supplied strain relief going into control box

through 35/8-in. diameter hole provided. After wires are in unit

control box, connect to power terminal block (see Power Wir-

ing section on page 20).

Bring low-voltage control wiring through the 7/8-in. diame-

ter hole provided in the condenser section side post. Use strain

relief going into 7/8-in. diameter hole in bottom of unit control

box.

After wiring is in control box, make connection to proper

terminals on terminal blocks (see Field Control Wiring section

below).

Affix crankcase heater sticker (located in the installers

packet) to unit disconnect switch.

Voltage to compressor terminals during compressor operation

must be within the voltage range indicated on the unit name-

plate. Phases must be balanced within 2%.

Use the formula in Tables 8A and 8B to determine the per-

centage of voltage imbalance.

Unit failure as a result of operation on improper line voltage

or excessive phase imbalance constitutes abuse and may cause

damage to electrical components.

For transformer 1 move the black wires connected to termi-

nal H2 and connect it to terminal H3.

For transformers 2-4, that are used for the 24-volt control

circuits, connect as follows:

1. Remove cap from red (208 v) wire.

2. Remove cap from spliced orange (230 v) wire. Discon-

nect orange wire from black unit power wire.

3. Cap orange wire.

4. Splice red wire and black unit power wire. Cap wires.

If the unit is equipped with the optional convenience outlet

connect the yellow wire to H2 on transformer 5.

FIELD CONTROL WIRING — The 48A Series units sup-

port a large number of control options that can impact the field

control wiring.

The control options that the unit can provide relate to the

following parameters:

• CV (constant volume), VAV (variable air volume),

VVT® (variable volume variable temperature) or

Carrier TEMP system control operation.

• Stand-alone with a thermostat (CV) or with a space sen-

sor (CV and VAV)

• Network application with CCN (Carrier Comfort

Network®) or other networks

• Demand ventilation with CO2 sensor

• Economizer and economizer with changeover control

• Staged gas heat

• Building and duct static pressure control

• Fire shutdown and smoke control

• Diagnostics and monitoring

For constant volume applications a thermostat (T-Stat) or

space temperature sensor (SPT) will be required.

T-STAT (Conventional Thermostat) — Unit can be con-

trolled with a Carrier-approved accessory electro-mechanical

or electronic thermostat that has two stages of cooling, two

stages of heating control and an output for indoor fan control. It

may also include time of day scheduling or use the scheduling

routines built into the ComfortLink™ controls.

Install thermostat according to the installation instructions

included with accessory thermostat and the unit wiring dia-

grams. 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 into unit to low-

voltage connection in the main control box. For thermostat

TB4 connections see Fig. 20.

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:

Settings may be changed slightly to provide a greater degree of

comfort for a particular installation.

IMPORTANT: The VAV (variable air volume) units use

variable frequency drives, which generate and can radiate

radio frequency energy. If units are not installed and used

in accordance with these instructions, they may cause radio

interference. They have been tested and found to comply

with limits of a Class A computing device as defined by

FCC (Federal Communications Commission) regulations,

Subpart J of Part 15, which are designed to provide reason-

able protection against such interference when operated in

a commercial environment.

WARNING

The unit must be electrically grounded in accordance with

local codes and NEC ANSI/NFPA 70 (National Fire

Protection Association). Electrical shock could cause per-

sonal injury.

IMPORTANT: If the supply voltage phase imbalance is

more than 2%, contact your local electric utility company

immediately.

IMPORTANT: On 208/230-v units, transformers 1-5 are

wired for 230-v. If 208/230-v unit is to be run with 208-v

power supply, the transformers must be rewired as follows:

IMPORTANT: BE CERTAIN UNUSED WIRES ARE

CAPPED. Failure to do so may damage the transformers.

SIZE STAGE 1

(W1) ON

STAGE 2

(W1 and W2) ON

020-050 0.24 0.13

051, 060 0.36 0.13

Staged Gas Control Option Thermistors — If the unit is

equipped with the staged gas heat option, supply-air ther-

mistors must be installed. Three supply-air thermistors are

shipped with staged gas units and are inside the heating sec-

tion. The supply-air thermistors should be located in the supply

duct with the following criteria:

• Downstream of the heat exchanger cells

• Equally spaced as far as possible from the heat

exchanger cells

• In a duct location where none of the supply-air ther-

mistors are within sight of the heat exchanger cells

• In a duct location with good mixed supply-air portion of

the unit.

SPT (Space Temperature Sensor) — For constant volume ap-

plications the ComfortLink™ controls can also be used with

T55 and T56 space temperature sensors that use a 10K ther-

mistor. The T56 sensor also has the capability for a config-

urable temperature set point offset. For variable air volume ap-

plications only the T55 sensor can be used.

Install sensor according to the installation instructions

included with accessory sensor. Locate sensor assembly on a

solid interior wall in the conditioned space to sense average

temperature.

Run wiring to the space sensor as shown in Fig. 21.

Note that when the remote sensor is used, the red jumper

wires provided must be connected from TB4 terminal 4 to 5

and TB4 terminal 5 to 1.

Both the T55 and T56 have a CCN communications port and

this should be wired to the CCN Communications TB3 board if

it is desired to have access to the CCN through the sensor. If

more than one T-55 sensor is being used and averaged, sensors

must be wired in multiples of 4 or 9 as shown in Fig. 22.

T1 T2

TH CSN

T56 SPTT55 SPT

UNIT

TB5

TB4

Fig. 20 — Field Control Thermostat Wiring

Fig. 21 — Space Temperature Sensor Wiring

RY1 Y2 W1 W2 G C X

FIELD-SUPPLIED THERMOSTAT

LIGHT

12345 678

a48-8243

a48-6854

RED

BLK

TB5

SENSOR 1 SENSOR 2 SENSOR 3 SENSOR 4

SENSOR 1 SENSOR 2 SENSOR 3

SENSOR 4 SENSOR 5 SENSOR 6

SENSOR 7 SENSOR 8 SENSOR 9

SPACE TEMPERATURE AVERAGING (4 SENSOR APPLICATION)

SPACE TEMPERATURE AVERAGING (9 SENSOR APPLICATION)

NOTE: Use T55 sensor only.

Fig. 22 — Space Temperature Averaging Wiring

a48-6855

T58 Communicating Thermostat — Carrier also has a fully

communicating thermostat which, if used, will be wired to the

CCN communication connections on TB3 as described in the

Carrier Comfort Network® Interface section below.

Carrier Comfort Network Interface — The rooftop units can

be connected to the CCN system. The communication bus

wiring is supplied and installed in the field. Wiring consists of

shielded, 3-conductor cable with drain wire. The system

elements are connected to the communication bus in a daisy

chain arrangement. The positive pin of each system element

communication connector must be wired to the positive pins of

the system element on either side of it, the negative pins must be

wired to the negative pins, and the signal pins must be wired to

signal ground pins. Wiring connections for CCN should be

made at the TB3 terminal block using the screw terminals. The

TB3 board also contains an RJ14 CCN plug that can be used to

connect a field service computer or other CCN device tempo-

rarily. There is also an RJ14 LEN (local equipment network)

connection that is used to connect a Navigator™ device or

download software.

Conductors and drain wire must be 20 AWG minimum

stranded, tinned copper. Individual conductors must be insulat-

ed with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An

aluminum/polyester 100% foil shield and an outer jacket of

PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum

operating temperature range of –20 C to 60 C (–4 F to 140 F) is

required. Table 9 lists cables that meet the requirements.

Table 9 — CCN Connection Approved Shield Cable

Table 10 — Color Code Recommendations

If a cable with a different color scheme is selected, a similar

color code should be adopted for the entire network. At each

system element, the shields of the communication bus cables

must be tied together. If the communication bus is entirely

within one building, the resulting continuous shield must be

connected to a ground at one point only. If the communication

bus cable exits from one building and enters another, the

shields must be connected to grounds at the lightning suppres-

sor in each building where the cable enters or exits the building

(one point per building only).

To connect the unit to the network:

1. Turn off power to the control box.

2. Cut the CCN wire and strip the ends of the red (+), white

(ground), and black (–) conductors. (If a different net-

work color scheme is used, substitute appropriate colors.)

3. Remove the 3-pin male plug from the base control board

in the main control box, and connect the wires as follows:

a. Insert and secure the red (+) wire to terminal 1 of

the 3-pin plug.

b. Insert and secure the white (ground) wire to termi-

nal 2 of the 3-pin plug.

c. Insert and secure the black (–) wire to terminal 3 of

the 3-pin plug.

4. Insert the plug into the existing 3-pin mating connector on

the base module in the main control box.

VAV Units with Heat — For variable air volume units that

will use heat, the variable air volume terminals should be

interlocked with the unit at TB5 terminals 1 and 2.

Demand Ventilation — The unit can be equipped with a CO2

sensor for use in demand ventilation. This can be factory

supplied and will be mounted in the return duct. It can also be

field supplied and mounted in the return duct or in the space.

Connect the field-installed 4 to 20 mA sensor to TB5 terminal

6 and 7. Do not remove the factory-installed 182-ohm resistor.

If an outdoor air quality sensor is used then it should be

wired to terminal 11 and 12 on TB6. This will require the use

of the optional controls expansion module.

Remote IAQ Override — If the control is being used with non

Carrier building management system it supports the use of the

remote IAQ override switch. This should be connected to

TB6 terminal 13 and 14. Use of this will require the optional

controls expansion module.

Remote Economizer Position Control — The ComfortLink™

controls will normally control the position of the economizer,

but it can also support field control of the economizer position

through a 4 to 20 mA signal. If this is used it should be con-

nected to TB5 terminal 6 and 7. If the signal is a 4 to 20 mA

signal then leave the 182-ohm resistor in place.

Remote Economizer Enable — If the control is being used

with other building management systems and the system will

control the enabling and disabling of the economizer free cool-

ing, this switch input can be connected to TB6 terminals 1 and

2. Note that the controls also support integrated economizer

changeover using outdoor dry bulb, differential dry bulb,

outdoor enthalpy and differential enthalpy.

Remote Occupancy Switch — For interface to other building

management systems the control also supports a switch input

for remote occupancy signals. This wiring should be connected

to terminal TB6 terminal 1 and 3.

Remote Economizer Minimum Position Control — If the

ComfortLink control is controlling the economizer, but a remote

minimum position is required, then an external 100K potentiom-

eter can be connected to TB5 terminal 6 and 7. Remove the

factory-installed 182-ohm resistor.

Smoke Sensor Interface — The ComfortLink control includes

an optional factory-installed return air smoke detector. Remote

alarm circuits can be wired to TB5 terminal 8 and 9.

Fire Shutdown and Smoke Control — The control supports

interface to fire and smoke control systems and allows for the

following system overrides from remote switch inputs.

• Fire Shutdown — Connect to TB6 terminals 8 and 9.

• Smoke Pressurization — Connect to TB6 terminal 12

and 13. This requires the use of the optional controls

expansion module.

• Smoke Evacuation — Connect to TB6 terminal 12 and

14. This requires the use of the optional controls expan-

sion module.

• Smoke Purge — Connect to TB6 terminal 12 and 15.

This requires the use of the optional controls expansion

module.

Demand Limiting — The control can also be used with demand

limiting control from remote building management systems. If a

two stage system is going to be used with Redline Limiting

where the machine is not allowed to increase load and Load Shed

where the load is decreased to a configurable limit in capacity

then these can be connected to TB6 terminals 4 and 5 and 5 and

6. This requires use of the controls expansion module.

MANUFACTURER CABLE PART NO.

Alpha 2413 or 5463

American A22503

Belden 8772

Columbia 02525

IMPORTANT: When connecting to CCN communi-

cation bus to system elements, use color coding

system for the entire network to simplify installation

and checkout. See Table 10.

SIGNAL TYPE CCN BUS CONDUCTOR

INSULATION COLOR

CCN PLUG PIN

NO.

Positive (+) RED 1

Ground WHITE 2

Negative (–) BLACK 3

Step 9 — Make Outdoor-Air Inlet Adjustments

ECONOMIZER AND FIXED OUTDOOR AIR

DAMPER — Hoods are used on all units with economizer or

adjustable self-closing fixed outdoor air damper.

NOTE: If accessory power exhaust or barometric relief pack-

ages are being added to the unit, install power exhaust or baro-

metric relief before installing economizer hoods.

Economizer Hood Assembly — The economizer hood is

shipped in a package secured to the outside of the unit. The

hood assemblies must be field-assembled. The 48AW,AY units

are side supply and side return. The return duct limits access to

economizer filters from below.

The 48AJ,AK,AW,AY020-050 units have two hoods on ev-

ery unit. The 48AJ,AK,AW,AY051 and 060 units have 3 hoods

on every unit.

NOTE: Before assembly of the economizer hood, check along

the outer edges of the economizer assembly for any seal strip

protruding past the flanges. Trim the excess seal strip so that it

is flush with the economizer assembly flanges.

Perform the following procedure to assemble the economizer

hood.

1. Apply black seal strip (provided) to outside top-edge of

hood sides. Wrap seal strip over edge to cover top flange

(6 hood sides). Make sure seal strip covers screw holes.

Allow strip to overhang 1/8-in. past the end opposite the

mounting flange. See Fig. 23.

2. Assemble hood sides, top, and cross member with

gasketed screws provided. See Fig. 24.

3. Attach 15 green speed clips (provided) to hood top.

4. Apply black seal strip (provided) to mounting flanges of

hood sides being sure to cover mounting holes. See

Fig. 25.

5. Apply black seal strip (provided) to back of hood top

mounting flange. Seal strip of hood top mounting flange

must press tightly against seal strip of hood side mount-

ing flanges. See Fig. 26.

6. Add gray foam strip (provided) to cross members on bot-

tom tray. See Fig. 27.

7. Attach gray foam strip (provided) to block-off baffle on

outer face of flange. See Fig. 28.

8. Remove the screws on each end and along top of damper

assembly of unit. Remove top 4 screws on each side of

filter panel under damper assembly. Set hood assembly in

place and attach to unit using these screws.

9. Remove screws along bottom of damper assembly.

Locate and mount block-off baffle using these screws.

10. Assemble 2 filter tracks side-by-side with the assembled

ends together.

11. Attach one mounting angle to the assembled end of the

filter track. See Fig. 29.

12. Attach 9 green speed clips (provided) to hood side panels.

Engagement section of clip faces up and towards the out-

side of the hood side panels.

13. Attach remaining mounting angle to other end of the filter

track with no. 10 screws provided.

14. Place filter track assembly in bottom of hood by attaching

to hood with speed clips and gasketed screws provided.

NOTE: Be sure the filters are installed with the airflow in the

correct direction.

15. Attach black seal strip (provided) to filter cover. Seal strip

should be applied centered over the holes of the one

flange, making sure to fully cover holes and centered over

the other large flange. See Fig. 30.

16. Slide two 20 x 25-in. filters into cross members of hood

assembly. Attach filter cover over filters with screws and

speed clips provided.

HOOD SIDE

TOP

FLANGE

SEAL

STRIP

BLACK

Fig. 23 — Adding Seal Strip to Top of Hood Sides

Fig. 24 — Economizer Hood Assembly

(Right Side/Center Economizer Hood Shown)

HOOD SIDE

MOUNTING

FLANGE

Fig. 25 — Adding Seal Strip to Sides of Hood Top

Mounting Flange

a48-8498

Step 10 — Position Power Exhaust/Barometric

Relief Damper Hood — All units are shipped with the

hoods folded inside the unit in a shipping position. For 48AJ,

and AK units the hood must be tilted out once the unit is in-

stalled. On 48AW, AY units, (designed for horizontal supply

and return) the assemblies will have to be relocated to return

ductwork. See Fig. 31 for dimensions and details.

All electrical connections have been made and adjusted at

the factory. The power exhaust blowers and barometric relief

dampers are shipped assembled and tilted back into the unit for

shipping. Brackets and extra screws are shipped in shrink wrap

around the dampers. If ordered, each unit will have 4

(48AJ,AK,AW,AY020-050 units) or 6 (48AJ,AK,AW,AY051

and 060 units) power exhaust blowers and motors or baromet-

ric relief dampers.

1. Remove 9 screws holding each damper assembly in

place. See Fig. 32. Each damper assembly is secured with

3 screws on each side and 3 screws along the bottom.

Save screws.

2. Pivot each damper assembly outward until edges of

damper assembly rest against inside wall of unit.

3. Secure each damper assembly to unit with 6 screws

across top (3 screws provided) and bottom (3 screws

from Step 1) of damper.

4. With screws saved from Step 1, install brackets on each

side of damper assembly.

5. Remove tape from damper blades.

CAUTION

Be careful when tilting blower assembly. Hoods and blow-

ers are heavy and can cause injury if dropped.

MOUNTING ANGLE

FILTER TRACK

ASSEMBLY

Fig. 29 — Mounting Angle Attached

to Filter Track Assembly

a48-8499

BLACK SEAL STRIP

(CENTERED)

FILTER COVER

Fig. 30 — Attaching Seal Strip to Filter Cover

48-1110

HOOD TOP

HOOD SIDE

CROSS MEMBER

GRAY FOAM STRIP

Fig. 26 — Adding Seal Strip to Back of Hood Top

Mounting Flange

Fig. 27 — Adding Foam Strip to Cross Member

48-1104

48-1105

BLOCKOFF BAFFLE

GRAY FOAM STRIP

Fig. 28 — Adding Seal Strip to Block-Off Baffle

a48-4328

Step 11 — Route VAV Static Pressure Sensors

VAV DUCT PRESSURE TRANSDUCER — The VAV duct

pressure transducer (VAV inverter pressure transducer) is locat-

ed behind the filter access door on the lower inner panel. See

Fig. 33. A section of field-supplied 1/4-in. plastic tubing must

be run from the high pressure tap on the differential pressure

switch and connected to a field-supplied tap in the supply-air

duct. The tap is usually located 2/3 of the way out on the main

supply duct. Remove plug button in panel to route tubing.

VAV BUILDING PRESSURE TRANSDUCER — The VAV

building pressure transducer (modulating power exhaust pres-

sure transducer) is located behind the filter access door on the

lower inner panel. See Fig. 33. A section of field-supplied

1/4-in. plastic tubing must be run from the high pressure tap on

the differential pressure switch to the conditioned space. The

pressure tube must be terminated in the conditioned space

where a constant pressure is required. This location is usually

in an entrance lobby so that the building exterior doors will

open and close properly. Remove plug button in panel to route

tubing.

The low pressure tap is factory-routed to the atmosphere.

For a positive-pressure building, route the high tap to building

air and low tap to atmosphere. For a negative-pressure

42.56”

42” MIN.

S/A

R/A

ECONOMIZER

HOOD

ECONOMIZER

HOOD

J BOX

PLENUM RATED

CABLE

(FIELD SUPPLIED)

12.94

(UNIT

OPENING)

NOTE: 020-050 SIZES SHOWN (2 POWER EXHAUST FANS).

SIZES 051 AND 060 HAVE 3 POWER EXHAUST FANS. ALL

UNIT SIZES HAVE THE SAME SIZE POWER EXHAUST.

“END #2”

“END #1”

ALTERNATE

LOCATION

(END)

23.28”

TYP

42.62

TYP

LOCATION

BAROMETRIC RELIEF

OR POWER EXHAUST

“SIDE #2”

23.28”

“SIDE #1”

42.62”

J BOX

R/A S/A

Fig. 31 — Power Exhaust Relocated to Side Return Duct

a48-8244

NOTES:

1. Unless otherwise specified, all dimensions are to outside of part.

2. Dimensions are in inches.

3. On 48AW,AY units, accessory barometric relief or power exhaust must be mounted in the field-supplied return ductwork.

Fig. 32 — Barometric Relief Damper and Power Exhaust Mounting Details

a48-3808

building, route the high tap to atmosphere and the low tap to

building air.

Step 12 — Install All Accessories — After all the

factory-installed options have been adjusted, install all field-

installed accessories. Refer to the accessory installation instruc-

tions included with each accessory.

The 48A Series units have a large number of factory-

installed options which were previously available only as

accessories. Some of the available options can also be installed

in the field if needed. In most cases the units have been

pre-wired so that the accessories can be easily installed.

Instructions are shipped with each accessory. Configuration of

the controls for these accessories as well as the factory-installed

options can be found in the Controls, Start-Up, Operation,

Service and Troubleshooting Book. The following is a list of

some of the common accessories:

• Thermostats and space temperature sensors

• LP (liquid propane) conversion kit

• Accessory barometric relief damper

• Accessory power exhaust

• Non-modulating to modulating power exhaust

• Condenser coil hail guards

• Outdoor humidity sensor (used for economizer enthalpy

changeover)

• Return air humidity sensors (used for economizer

differential enthalpy changeover)

• Return air smoke detector

• Controls expansion module (used for interface to build-

ing management systems, not typically needed on

system with the Carrier Comfort Network® [CCN] sys-

tem)

• Plugged filter sensor

• Motormaster® V low ambient head pressure control

Step 13 — Field Modifications

DUCTWORK

Bottom Return Units (48AJ and AK) Field-Modified for

Side Return — The 48AJ and AK units with bottom return air

connections may be field-modified to accommodate side return

air connections.

Conversion to horizontal return requires that the bottom

return openings of the unit must be sealed with airtight panels

capable of supporting the weight of a person. The return

ductwork connection locations on the side of the unit are higher

than normal (31-in. high). Unit-mounted power exhaust or

barometric relief cannot be used because of return air ductwork

will cover the power exhaust or barometric relief installation

locations. Power exhaust or barometric relief may be installed

in the return air ductwork.

To convert the unit, perform the following:

1. Seal the bottom return openings of the unit with airtight

panels capable of supporting the weight of a person.

2. Remove the panels located below the economizer

outdoor-air dampers. These openings will be used for the

return-air ductwork. There are 2 panels on 48AJ,AK020-

050 units. There are 3 panels on 48AJ,AK051 and 060

and units. These openings are normally used for power

exhaust or barometric relief.

3. Run the return air ductwork up to the openings. One

single duct is recommended to connect to the unit over

the return air openings. See Fig. 34. The return duct must

incorporate a minimum 3/4-in. flange for connection to

the unit cabinet. The unit does not have duct flanges for

this conversion.

Side Supply and Return Units (48AW,AY) with Field-

Installed Power Exhaust in Return Duct — Space must be

available in the return duct to mount the power exhaust fan

(gravity relief) modules. Dimensions and suggested locations

are shown in Fig. 34. These instructions are a guideline and not

a comprehensive procedure. The design contractor must pro-

vide some design initiative.

The wiring harness that is provided with the power exhaust

accessory is not long enough for the fan modules to be mount-

ed in the return air duct. Field-supplied wiring must be spliced

into the harness. Use a junction box at each splice. The wiring

may be run in the return duct, or externally in conduit. A ser-

vice access panel will be needed near each power exhaust fan.

IMPORTANT: Carrier recommends the installation of

field-fabricated wind baffles on all vertically oriented

condenser coils when operating in environments with

prevailing winds of more than 5 MPH and where tem-

peratures drop below 32 F. See the Motormaster

accessory installation guide for instructions.

IMPORTANT: The following section is a guideline and not

a comprehensive procedure to field modify the units. The

installing contractor must provide some design initiative.

Field-conversion is complex and is not recommended.

Units with electric heat must not be converted because of

potential heating mode operating problems.

AUXILIARY

CONTROL BOX

PRESSURE TRANSDUCERS

(INSIDE OF PANEL)

Fig. 33 — Pressure Transducer Locations

a48-6976

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 36 8-09 Replaces: 48A-5SI

31.25”

INSIDE

97.78” (020-050), 150.47” (051 AND 060)

INSIDE DIMENSION

Fig. 34 — Side Return Air Conversion

a48-8245

Carrier Weathermaker 48Aj Users Manual 48a 7si

WEATHERMAKER 48AJ 48a-7si

48AJ to the manual 975003af-2aee-4ff9-b5c1-b978d00e0156

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