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®
WEATHERMAKER
48AJ,AK,AW,AY020-060
Single Package Rooftop Units
Electric Cooling/Gas Heating
with Scroll Compressor and
COMFORTLINK™ Controls
Installation Instructions
CONTENTS
Page
WARNING
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
1. Improper installation, adjustment, alteration, service,
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36
or maintenance can cause property damage, personal
Step 1 — Provide Unit Support . . . . . . . .
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ROOF CURB — For vertical discharge units, assemble or in- Step 3 — Field Fabricate Ductwork — Secure all stall accessory roof curb in accordance with instructions ducts to building structure. Use flexible duct connectors be- shipped with this accessory. See Fig. 1-3. Install insulation, tween unit and ducts as required. Insulate and weatherproof all cant strips, roofing, and counter flashing as shown. Ductwork external ductwork, joints, and roof openings with counter can be installed to roof cur
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a48-6715 3 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. 1 — Roof Curb — 48AJ,AK020-035 Units
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a48-6716 4 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
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a48-6717 5 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. Fig. 3 — Roof Curb — 48AJ,AK051 and 060 Units
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a48-8235 6 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 DUNNAG
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a48-8236 7 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 DU
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8 Fig. 6 — Base Unit Dimensions — 48AJ,AK051 and 060
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A48-8380 9 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. Fig. 7 — Base
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a48-8239 10 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. * OPERATIN
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a48-8240 11 FOR CENTERS OF GRAVITY, OPERATING AND CORNER WEIGHTS, SEE FIGURE 10 Fig. 9 — Base Unit Dimensions — 48AW,AY051 and 060
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a50-8102 12 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 48AJ/AK LOW HEAT OF EVAPORATOR COIL) 48AJ/AK051 LOW HEAT 4. FOR SMALLER SERVICE AND OPERATIONAL CLEARANCES, 48AJ/AK HIGH HEAT 48AW/AY051 LOW HEAT CONTACT CARRIER APPLICATION ENGINEERING DEPART- MENT.
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Table 1 — Physical Data — 48AJ,AK,AW,AY Units 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 1…SR*812AT, 1…SR*942AT/ Quantity ... Type (Ckt 1/Ckt 2) 2…SR*782AT/1…SR*782AE 2 ... SR*942AT/1…SR*942AE 2…SR*782AT/2…SR*812AT 1…SR*942AE Number of Refrigerant Circuits 22 2 2 Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged REFRIGERANT TYPE R-22 Operating Charge (lb-oz) Circuit 1
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Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont) UNIT 48AJ,AK,AW,AY 035 036 040 041 40 NOMINAL CAPACITY (tons) 35 35 40 BASE UNIT See Operating Weights Table OPERATING WEIGHT (lb) COMPRESSOR 1…SR*812AT, 1…SR*812AT, Quantity ... Type (Ckt 1/Ckt 2) 2…SR*942AT/2…SM125 2…SR*942AT/2…SM125 1…SR*942AT/2…SR*942AT 1…SR*942AT/2…SR*942AT Number of Refrigerant Circuits 222 2 Oil (oz) (Ckt 1, Ckt 2) Precharged Precharged Precharged Precharged REFRIGERANT TYPE R-22 Operating Charge (lb-oz) C
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Table 1 — Physical Data — 48AJ,AK,AW,AY Units (cont) UNIT 48AJ,AK,AW,AY 050 051 060 NOMINAL CAPACITY (tons) 50 50 60 BASE UNIT See Operating Weights Table OPERATING WEIGHT (lb) COMPRESSOR 2…SM125/1…SM125, 1..SM160,1..SM175/ Quantity ... Type (Ckt 1/Ckt 2) 2…SM125/2…SM125 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
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a48-8246 16 CAUTION - NOTICE TO RIGGERS: ALL PANELS MUST BE IN PLACE WHEN RIGGING. 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. WEIGHTAC B UNIT LB KG INCHES MM INCHES INCHES MM MM 50AJ/AK020 4607 2090 87.7 2227 70.9 1801 42.0 1067 48AJ/AKD020 4697 2131 87.7 2227 71.9 1826 42.5 1080 48AJ/AKE020 4777 2167 87.7 2227 72.8 1849 41.0 1041 50AW/AY020 4685 2125 87.7 2227 70.9 1801 42.0 1067 48A
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Table 2 — Unit Operating Weights BASE UNIT WEIGHTS — lb UNIT 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 Table 3 — Option and Accessory Weights OPTION/ACCESSORY WEIGHTS — lb OPTION/ ACCESSORY 020 025 027 030 0
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Table 6 — Evaporator Fan Motor Data MOTOR FAN UNIT FAN MOTOR MOTOR SHEAVE BUSHING FAN SHEAVE BUSHING BELT BELT SIZE MOTOR SHAFT SHAFT DIA. SHEAVE PITCH DIAMETER SHEAVE PITCH DIAMETER (Quantity) TENSION 48AJ,AK, HP SPEED (in.) (P/N) DIAMETER (in.) (P/N) DIAMETER (in.) (P/N) (lb at .25 in.) AW,AY (rpm) (in.) (in.) 5 1.125 677 BK55 4.8 NONE - 1.125 1B5V124 12.4 B - 1.9375 BX56 8 020 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.
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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. a48-3823 Fig. 16 —
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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 wi
