York YDAJ87HU7, Руководство пользователя, Страница: 98 / 100

YORK INTERNATIONAL
98
PROBLEM CAUSE SOLUTION
Low Compressor 1. Low oil charge. 1. Oil level should be visable in either sight glass at all times.
Oil Level Add YORK “C” oil if necessary.
(Particularly on start-up) 2. Excessive flood back of liquid refrigerant. 2. Adjust Thermal Expansion Valve (TXV) or replace power
element. Check TXV bulb location. Should be located on
suction line at least 8"-10" from nearest elbow.
Bulb should be at 4 o’clock or 8 o’clock position,
have good contact with suction line and be well insulated.
Crankcase Heater 1. Open in 115 VAC wiring to heater. 1. Check wiring.
won’t Energize 2. Defective heater. 2. Replace heater.
(Should energize anytime 3. Auxilliary contacts of compressor contactor 3. Replace contactor.
unit is “OFF) defective.
(Min. current draw = 2 amps)
Compressor won’t load 1. Suction pressure > programmed unload point or 1. Excessive load. Check OPERATING LIMITATIONS.
(Solenoid valve de-energizes operating limitations have been exceeded. Check programmed unloading point.
to load compressor) 2. Discharge pressure > programmed unload point or 2. Check OPERATING LIMITATIONS.
operating limitations have been exceeded. Check programmed unloading point.
3. Demand not great enough. 3. OK. Become familiar with control operation.
4. Defective loading solenoid. 4. Replace compressor loading solenoid.
5. Faulty wiring to loading solenoid. 5. Check wiring.
6. Defective water temperature sensor. 6. Compare sensor with a thermometer. Variation of sensor
vs thermometer of +/– 2°F is not unusual.
Replace if necessary.
7. Defective evaporator or optional discharge transducer. 7. Replace transducer after verifying with a gauge.
Lack of Cooling 1. Fouled evaporator surface. 1. Contact the local YORK service representative.
Effect 2. Faulty compressor suction and/or discharge valves. 2. Contact the local YORK service representative.