Troubleshooting Guide
Cycle
Parts
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
Operating Current
Temp. difference : approx. °F(0°C)
Current: less than 80% of rated current
Temp. difference : approx. 14°F(8°C)
Current: less than 80% of rated current
Temp. difference : less than 14°F(8°C)
Current: over the reated current
Temp. difference : over 14°F(8°C)
•All amount of refrigerant leaked out. Check refrigeration cycle.
•Refrigerant leakege
Clog of refrigeration cycle Defective compressor
•Excessive amount of refrigerant
•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 | Temperature |
|
|
(Compared with | (Compared with | Cause of Trouble | Description |
the normal value) | the normal valve) |
|
|
|
|
|
|
| High | Defective compressor | Current is low. |
| Defective |
| |
|
|
| |
Higher |
|
|
|
| Excessive amount of | High pressure does not quickly | |
|
| ||
| Normal | refrigerant | rise at the beginning of |
|
|
| operation. |
|
|
|
|
|
| Insufficient amount of | Current is low. |
Lower | Higher | refrigerant (Leakage) |
|
|
| Clogging | Current is low. |
|
|
|
|
NOTICE
1.The suction pressure is usually 8.5~9.5 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.
Service Manual 51
