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38AK007,008,012
38AKS008,009,012
Air-Cooled Condensing Units
50/60 Hz
Installation, Start-Up and
Service Instructions
Follow all safety codes. Wear safety glasses and work
CONTENTS
gloves. Use quenching cloth for brazing operations. Have fire
Page
extinguisher available. Read these instructions thoroughly.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
Consult local building codes and National Electrical Code
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table 1A — Physical Data — 50/60 Hz (English) UNIT 38 AK007 AK008 AK012 AKS008 AKS009 AKS012 OPERATING WEIGHT (lb) Aluminum Coils (Standard) 340 392 426 510 564 564 Copper Coils (Optional) 386 460 503 578 632 632 RIGGING WEIGHT (lb) Aluminum Coils (Standard) 390 442 476 560 614 614 Copper Coils (Optional) 436 510 553 628 682 682 REFRIGERANT* R-22 COMPRESSOR Bristol, Reciprocating Copeland, Scroll Copeland, Scroll Reciprocating, Semi-Hermetic 1...06DH824 Quantity...Type 1...H26A72Q 1...ZR94KC 1..
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Table 1B — Physical Data — 50/60 Hz (SI) UNIT 38 AK007 AK008 AK012 AKS008 AKS009 AKS012 OPERATING WEIGHT (kg) Aluminum Coils (Standard) 154 177 192 231 256 256 Copper Coils (Optional) 175 208 215 262 287 287 RIGGING WEIGHT (kg) Aluminum Coils (Standard) 176 200 215 254 279 279 Copper Coils (Optional) 198 231 250 285 309 309 REFRIGERANT* R-22 COMPRESSOR Bristol, Reciprocating Copeland, Scroll Copeland, Scroll Reciprocating, Semi-Hermetic 1...06DH824 Quantity...Type 1...H26A72Q 1...ZR94KC 1...ZR12
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CONSIDER SYSTEM REQUIREMENTS Raise from above to lift unit from rails or pad when unit is in final position. Consult local building codes and NEC for special instal- lation requirements. After unit is in position, remove all shipping materials and Allow sufficient space for airflow clearance, wiring, top crating. refrigerant piping, and unit servicing. See Fig. 2. COMPRESSOR MOUNTING — Compressors are shipped Locate unit so that condenser airflow is unrestricted on from the factory held do
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ELECTRICAL CONNECTIONS UNIT 38 DIM. A DIM. B DIM. C DIM. D DIM. E DIM. F 1 3 1 5 5 1′-6 / ″ 1′-2 / ″ — 1′-2 / ″ 1′-4 / ″ 2′-9 / ″ 2 4 4 16 16 CONNECTION SIZES AK007 [470.0] [375.0] — [362] [415] [846.5] 3 AA 1 / ″ Dia [35] Field Power Supply Hole 1 5 7 8 1′-8″ 1′-6 / ″ — 1′-3″ 2′- / ″ 3′-5 / ″ 2 16 16 AK008 [508.0] [470.0] — [381] [613] [1052.5] BB 2″ Dia [51] Power Supply Knockout 5 7 1′-9″ 1′-8″ 2′-0″ 1′-3″ 2′- / ″ 3′-5 / ″ 1 16 16 CC 2 / ″ Dia [64] Power Supply Knockout 2 AK012 [533.4] [508.0
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Step 4 — Make Electrical Connections Unit cabinet must have an uninterrupted, unbroken electri- cal ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control com- partment, or conduit approved for electrical ground when installed in accordance with NEC ANSI (American National Standards Institute)/NFPA (National Fire Protec- tion Association) 70 (U.S.A. Standards) and local electric
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Table 5 — Electrical Data VOLTAGE RANGE COMPRESSOR OFM POWER SUPPLY UNIT NOMINAL VOLTAGE 38 (V-Ph-Hz) MIN MAX RLA LRA FLA MCA MOCP 208/230-3-60 187 254 21.8 158 1.9 30.1 40 460-3-60 414 508 10.0 79 1.0 13.6 20 AK007 575-3-60 518 632 9.0 65 1.9 14.1 20 220-3-50 198 242 21.8 158 1.0 28.8 35 400-3-50 360 440 10.0 79 1.0 14.0 20 208/230-3-60 187 254 28.8 195 3.8 39.8 50 460-3-60 414 508 14.7 95 1.9 20.3 25 AK008 575-3-60 518 632 10.8 80 1.9 15.4 20 220-3-50 198 242 28.8 195 1.5 37.5 45 400-3-50 360
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FIELD CONTROL WIRING — Install a Carrier-approved accessory thermostat assembly according to installation 24-V BARRIER instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense aver- age temperature in accordance with thermostat installation LOW-VOLTAGE instructions. THERMOSTAT Route thermostat cable or equivalent single leads of colored CONNECTION BOARD wire from subbase terminals to low-voltage connections on unit (shown in Fig. 6) a
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met. Note that charging charts are different from type normally START-UP used. Charts are based on charging the units to the correct sub- Preliminary Checks cooling for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the 1. Field electrical power source must agree with unit name- pressure gage to the service port on the liquid line service plate rating. valve. Mount the temperature sensing device on the liquid line, 2. Check that all
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Cycle-LOC device by setting the thermostat to eliminate cool- ing demand and return it to the original set point. If the system shuts down again for the same fault, determine the possible cause before attempting to reset the Cycle-LOC device. Low-Pressure/Loss-of-Charge Switch (LPS) — When the liquid line pressure drops below 7 psig (48 kPa), the LPS opens 24-v power to the compressor contactor and stops the compressor. When the pressure reaches 22 psig (152 kPa), the switch resets and the compr
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4. Adjust fan height as shown in Fig. 13. Oil Charge (Tables 1A and 1B) 5. Tighten setscrews. 38AKS UNITS — Allow unit to run for about 20 minutes. Stop unit and check compressor oil level. Add oil only if neces- 6. Replace condenser-fan assembly. sary to bring oil into view in sight glass. Use only Carrier- approved compressor oil. Approved oils are: Suniso 3GS WF32-150 38AK UNITS — The 38AK units do not have a sight glass and are factory charged with the correct amount of oil. ALL UNITS — Do n
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Capacity Control — Unit 38AKS012 Only — A Compressor Removal — See Tables 1A and 1B for suction pressure-actuated unloader controls 2 cylinders and compressor information. Follow safety codes and wear safety provides capacity control. Unloaders are factory set (see glasses and work gloves. Table 1A or 1B), but may be field adjusted as follows: 1. Shut off power to unit and tag disconnect. Remove unit CONTROL SET POINT (cylinder load point) is adjustable access panel (front of unit). from 0 to
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TROUBLESHOOTING GUIDE SYMPTOM CAUSE REMEDY Compressor does not run — Power off. Restore power. Contactor open Fuses blown. Replace with correct fuses after finding cause and correcting. Transformer open/shorted. Replace transformer if primary windings are receiving power and no output. Thermostat circuit open. Check thermostat setting. Low-pressure switch open. Check for refrigerant undercharge or system leak. High-pressure switch open. Check for refrigerant overcharge or obstruction of outdoor
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LEGEND TRAN — Transformer C— Contactor, Compressor CAP — Capacitor Terminal (Marked) CB — Circuit Breaker CLO — Compressor Lockout Terminal (Unmarked) COMP — Compressor Motor Terminal Block EQUIP — Equipment GND — Ground Factory Wiring NEC — National Electrical Code OFC — Outdoor-Fan Contactor Field Power Wiring OFM — Outdoor-Fan Motor Accessory or Optional Wiring QT — Quadruple Terminal TB — Terminal Block Fig. 15 — Typical Component Arrangement Copyright 2001 Carrier Corporation Manufacturer r
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START-UP CHECKLIST I. Preliminary Information MODEL NO. _______________________________ SERIAL NO. ____________________________________ OUTDOOR: INDOOR: AIR HANDLER MANUFACTURER __________________________________________________________________ MODEL NO.__________________________________ SERIAL NO. ____________________________________ ADDITIONAL ACCESSORIES ______________________________________________________________________________ II. Pre-Start-Up OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE?
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CHECK VOLTAGE IMBALANCE LINE-TO-LINE VOLTS: AB________ V AC________ V BC ________ V (AB + AC + BC)/3 = AVERAGE VOLTAGE = _________ V MAXIMUM DEVIATION FROM AVERAGE VOLTAGE = _________V VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) = _________ % IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM! CALL LOCAL POWER COMPANY FOR ASSISTANCE. III. Start-Up CHECK INDOOR (EVAPORATOR) FAN SPEED AND RECORD. ___________ CHECK OUTDOOR (CONDENSER) FAN SPEED AND RECORD. _____________ AF
