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38AKS013-024
Air-Cooled Condensing Units
50/60 Hz
Installation, Start-Up and
Service Instructions
Only trained, qualified installers and service mechanics
CONTENTS
should install, start-up, and service this equipment (Fig. 1).
Page
Untrainedpersonnelcanperformbasicmaintenancefunc-
SAFETY CONSIDERATIONS...................1
tions such as cleaning coils.All other operations should be
INSTALLATION .............................1-12
performed by trained service personnel.
Step 1 — Complete Pre-Installa
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2 NOTE: Service areas —Allow 3 ft (914 mm) on both sides and 2 ft (610 mm) on both ends of unit for servicing. Fig. 1 — Dimensions
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132 45 6 7 12 11 10 9 8 LEGEND 1— No. 1 Fan 5— No. 2 Fan 9— Compressor 2— High-Pressure Switch 6— Terminal Block 1 (Unit Power) 10 — Low-Pressure Switch 3 3— Circuit Breaker — Control Circuit 7— Terminal Block 2 (Control Power) 11 — Hot Gas Bypass Piping Stub ( ⁄8-in. ODM) 4— Circuit Breakers — Power Circuits 8— Wraparound Coil 12 — Muffler Fig. 2 — Component Locations (Typical) 3
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Table 1A — Physical Data (English, 60 Hz) UNIT 38AKS 013 014 016 024 OPERATING WEIGHT (lb) With Aluminum-Fin Coil 732 779 789 900 With Copper-Fin Coil 825 919 929 1040 REFRIGERANT* R-22 Shipping Charge (lb) 2.1 3.1 3.1 3.1 Operating Charge, Typical (lb)† 22 23 23 28 COMPRESSOR Reciprocating, Semi-Hermetic Model 06DD824 06DD328 06DD537 06EA250 No. Cylinders 666 4 Speed (rpm) 1750 Capacity Steps (%) Accessory 33**,66,100 33**,66,100 33**,66,100 — Standard 66,100 66,100 66,100 50,100 Crankcase Heat
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Table 1B — Physical Data (SI, 60 Hz) UNIT 38AKS 013 014 016 024 OPERATING WEIGHT (kg) With Aluminum-Fin Coil 332 353 358 408 With Copper-Fin Coil 374 417 421 472 REFRIGERANT* R-22 Shipping Charge (kg) 0.95 1.40 1.40 1.40 Operating Charge, Typical (kg)† 10.0 10.4 10.4 12.7 COMPRESSOR Reciprocating, Semi-Hermetic Model 06DD824 06DD328 06DD537 06EA250 No. Cylinders 666 4 Speed (r/s) 29.2 Capacity Steps Accessory 33**,66,100 33**,66,100 33**,66,100 — Standard 66,100 66,100 66,100 50,100 Crankcase He
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Table 1C — Physical Data (English, 50 Hz) UNIT 38AKS 013 014 016 024 OPERATING WEIGHT (lb) With Aluminum-Fin Coil 732 779 789 900 With Copper-Fin Coil 825 919 929 1040 REFRIGERANT* R-22 Shipping Charge (lb) 2.1 3.1 3.1 3.1 Operating Charge, Typical (lb)† 22 23 23 28 COMPRESSOR Reciprocating, Semi-Hermetic Model 06DD824 06DD328 06DD537 06EA250 No. Cylinders 666 4 Speed (rpm) 1450 Capacity Steps Accessory 33**,66,100 33**,66,100 33**,66,100 — Standard 66,100 66,100 66,100 50,100 Crankcase Heater W
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Table 1D — Physical Data (SI, 50 Hz) UNIT 38AKS 013 014 016 024 OPERATING WEIGHT (kg) With Aluminum-Fin Coil 332 353 358 408 With Copper-Fin Coil 374 417 421 472 REFRIGERANT* R-22 Shipping Charge (kg) 0.95 1.40 1.40 1.40 Operating Charge, Typical (kg)† 10.0 10.4 10.4 12.7 COMPRESSOR Reciprocating, Semi-Hermetic Model 06DD824 06DD328 06DD537 06EA250 No. Cylinders 666 4 Speed (r/s) 24.2 Capacity Steps Accessory 33**,66,100 33**,66,100 33**,66,100 — Standard 66,100 66,100 66,100 50,100 Crankcase He
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Table2—Weight Distribution WEIGHT Support Point UNIT Total 38AKS Operating ABCD E F lb kg lb kg lb kg lb kg lb kg lb kg lb kg 013 732 332 94 43 93 42 93 42 149 68 151 68 152 69 013C 825 374 119 54 116 53 115 52 157 71 159 72 159 72 014 779 353 95 43 94 43 94 43 164 74 166 75 166 75 014C 919 417 131 59 129 59 128 58 176 80 177 80 178 81 016 789 358 95 43 95 43 96 44 167 76 168 76 168 76 016C 929 421 131 59 130 59 130 59 178 81 180 82 180 82 024 900 408 119 54 114 52 113 51 179 81 185 84 190 86 02
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Table4A—RefrigerantPipingSizes—60HzUnits Table5A—RefrigerantPipingSizes—50HzUnits LENGTH OF INTERCONNECTING PIPING, FT (M) LENGTH OF INTERCONNECTING PIPING, FT (M) 0-15 15-25 25-50 50-75 75-100 0-15 15-25 25-50 50-75 75-100 COND UNIT (0-4.5) (4.5-7.5) (7.5-15) (15-23) (23-30) (0-4.5) (4.5-7.5) (7.5-15) (15-23) (23-30) UNIT 38AKS 38AKS Line Size (in. OD) Line Size (in. OD) L S L S L S LSLS L S L S LSLSLS 1 1 1 1 5 3 5 3 5 5 1 1 1 1 5 3 5 3 5 3 013 ⁄2 1 ⁄8 ⁄2 1 ⁄8 ⁄8 1 ⁄8 ⁄8 1 ⁄8 ⁄8 1 ⁄8* 013 ⁄2 1
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1 INSTALLFILTERDRIER(S)ANDMOISTUREINDICA- 2. Remove ⁄4-in.flarecapfromliquidvalveSchraderport. TOR(S) — Every unit should have a filter drier and liquid- 3. Attach refrigerant recovery device and recover holding moistureindicator(sightglass).Insomeapplications,depending charge. onspaceandconveniencerequirements,itmaybedesirable 4. Remove runaround loop. toinstall2filterdriersandsightglasses.Onefilterdrierand 5. Installafield-suppliedliquidmoistureindicatorinthepip- sight glass may be installed at A l
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LEGEND EQUIP GND — Equipment Ground NEC — National Electrical Code Factory Wiring LEGEND Field Wiring C— Compressor Contactor HD — Heating Device Fig. 7 — Main Power Supply Wiring IFC — Indoor-Fan Contactor LLSV1 — Liquid Line Solenoid Valve 1 — Refrigerant Migration Control LLSV2 — Liquid Line Solenoid Valve 2 — Capacity Control R— Relay Factory Wiring Field Wiring NOTES: 1. Combination LLSV plus IFC va should not exceed 30 va. 2. Do not exceed 5 va (24 vac) per coil. 3. If va values shown in N
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Table 6B — Electrical Data (3 Ph/50 Hz) UNIT COMPR FAN MOTORS 230 v (Single Phase) Volts UNIT FLA (ea) MOCP Total 38AKS Fan No. Model Supplied* MCA ICF (Fuse RLA LRA kW Fans Nameplate Only) Min Max 1 2 803 230 198 264 47.5 134 75 32.9 128 013 2 2.9 3.5 1.20 903 400 342 457 31.4 80 50 20.0 74 803 230 198 264 51.0 149 75 35.7 143 014 2 2.9 3.5 1.20 903 400 342 457 34.0 89 50 22.1 83 803 230 198 264 66.9 206 100 47.9 200 016 2 2.9 3.5 1.20 903 400 342 457 43.0 121 60 29.3 115 803 230 198 254 91.8 2
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START-UP Compressor crankcase heater must be on for 24 hours before start-up. After the heater has been on for 24 hours, Never charge liquid into the low-pressure side of sys- theunitcanbestarted.Ifnotimehaselapsedsincethepre- tem.Donotovercharge.Duringchargingorremovalof liminary charge step has been completed, it is unnecessary refrigerant, be sure indoor-fan system is operating. to wait the 24-hour period. Adjust Refrigerant Charge Preliminary Checks NOTE: Actualstart-upandallrefrigerantcharg
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14 Fig. 10 — 38AKS013 and 38AKS024 Charging Chart
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15 Fig. 11 — 38AKS014 Charging Chart
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16 Fig. 12 — 38AKS016 Charging Chart
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PRESSUREDIFFERENTIAL(differencebetweencylinder OPERATING SEQUENCE load and unload points) is adjustable from 6 to 22 psig Cooling— Whenthefirststage(TC1)ofthecoolingther- (41.4 to 152 kPag). To adjust, turn pressure differential ad- mostat closes, the timer starts. After approximately justment screw (Fig. 13) counterclockwise to its back stop 3seconds,thetimerexpires,energizingthecompressorand position. In this position, differential is 6 psig (41.4 kPag). fanmotorno.1.Whentheliquidpressurebuilds
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Winter Start Control (If Required) — Install Ac- Outdoor Fans — Each fan is supported by a formed- cessory Package 38AE900021. wire mount bolted to the fan deck and covered with a wire guard. The exposed end of the motor shaft is covered with Crankcase Heater — The heater prevents refrigerant a rubber boot. In case a fan motor must be repaired or re- migrationandcompressoroildilutionduringshutdownwhen- placed, be sure the rubber boot is put back on when the fan ever compressor is not operating.
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Fig. 15 — Outdoor Fan Fig. 17 — Coil Cleaning (Typical) Fig. 16 — Pivot and Support Top Cover 19
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TROUBLESHOOTING PROBLEM SOLUTION COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 1. Restore power. 2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse. 3. No control power. 3. Check control circuit breaker; reset if tripped or replace if defective. 4. Thermostat circuit open. 4. Check thermostat setting. 5. Time GuardT II device not operating. 5. Check Time Guard II devices. 6. Compressor circuit breaker tripped. 6. Check for excessive
