Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current. Temp. difference : approx. 0°C Current : less than 80% of rated current Temp. Difference Temp. difference : approx. 8°C Current : less than 80% of rated current � All amount of refrigerant leaked out. Check refrigeration cycle.
� Refrigerant leakege Clog of refrigeration cycle Defective compressor
Operating Current
Temp. difference : less than 8°C Current : over the reated current
� Excessive amount of refrigerant
Temp. difference : over 8°C
� Normal
Notice : Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower temperature difference is larger. 2. Check temperature and pressure of refrigeration cycle. Suction pressure (Compared with the normal value) Temperature (Compared with the normal valve) High Higher Normal
Cause of Trouble Defective compressor Defective 4-way reverse valve Excessive amount of refrigerant Insufficient amount of refrigerant (Leakage) Clogging
Description Current is low. High pressure does not quickly rise at the beginning of operation. Current is low. Current is low.
Lower
Higher
Notice : 1. The suction pressure is usually 4.5~6.0 kg/cm2G(Cooling) at normal condition. 2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty.
