Carrier 38AKS028-044 Installation, Start-up And Service Instructions Manual

Contents

TROUBLESHOOTINGSYMPTOM AND PROBABLE CAUSE PROBABLE REMEDYCOMPRESSOR DOES NOT RUN1. Control circuit breaker tripped 1. Reset control circuit breaker2. Power line open 2. Reset circuit breaker3. Oil pressure switch tripped 3. Reset oil pressure switch at unit4. Safety device tripped 4. Reset control circuit with thermostat5. Contactor stuck open 5. Replace contactor6. Loose terminal connection 6. Check connections7. Improperly wired controls 7. Check and rewire8. Seized compressor 8. Check motor winding for open or short.Replace compressor, if necessary9. Low line voltage 9. Check line voltage — determine location ofvoltage drop and remedy deficiency10. Compressor motor defective 10. Check motor winding for open or short.Replace compressor, if necessaryCOMPRESSOR STOPS ON LOW-PRESSURECONTROL1. Compressor suction shutoff valve partially closed 1. Open valve2. Low refrigerant charge 2. Add refrigerant3. Liquid line solenoid valve(s) fails to open 3. Check liquid line solenoid valve for properoperation. Replace if necessary4. Liquid line shutoff valve closed 4. Open valveCOMPRESSOR STOPS ON HIGH-PRESSURECONTROL1. Compressor discharge valve partially closed 1. Open valve or replace if defective2. Air in system 2. Purge and evacuate system3. Condenser fan(s) not operating 3. Check motor wiring and repair or replace ifdefective4. System is overcharged. 4. Reclaim charge as neededUNIT OPERATES TOO LONG ORCONTINUOUSLY1. Low refrigerant charge 1. Add refrigerant2. Control contacts fused 2. Replace control3. Air in system 3. Purge and evacuate system4. Partially plugged expansion valve or filter drier 4. Clean or replaceSYSTEM IS NOISY1. Piping vibration 1. Support piping as required2. Compressor noisy 2. Check valve plates for valve noise. Replacecompressor if bearings are wornCOMPRESSOR LOSES OIL1. Leak in system 1. Repair leak2. Crankcase heaters not energized during 2. Check wiring and relays. Check heater andshutdown replace if defective3. Improper interconnecting piping design 3. Check piping for oil return. Replace ifnecessaryFROSTED SUCTION LINE1. Expansion valve admitting excess refrigerant 1. Adjust expansion valveHOT LIQUID LINE1. Shortage of refrigerant due to leak. 1. Repair leak and recharge2. Expansion valve opens too wide 2. Adjust expansion valveFROSTED LIQUID LINE1. Restricted filter drier 1. Remove restriction or replaceCOMPRESSOR WILL NOT UNLOAD1. Defective unloader 1. Replace2. Defective capacity control solenoid valve 2. Replace valve3. Miswired liquid line solenoid 3. Rewire correctly4. Weak, broken, or wrong valve body spring 4. Replace springCOMPRESSOR WILL NOT LOAD1. Miswired capacity control liquid solenoid 1. Rewire correctly2. Defective capacity control solenoid valve 2. Replace valve3. Plugged strainer (high side) 3. Clean or replace strainer4. Stuck or damaged unloader piston or piston 4. Clean or replace the necessary partsring(s)21

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