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Service Manual 51
Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
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)
Operating Current
• All amount of refrigerant leaked
out. Check refrigeration cycle.
• Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
• Excessive amount of refrigerant
• Normal
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.
1. The suction pressure is usually 8.5~9.5 kg/cm
2
G(Cooling) at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
NOTICE
NOTICE
Suction pressure Temperature
(Compared with (Compared with Cause of Trouble Description
the normal value) the normal valve)
Defective compressor Current is low.
Defective 4-way reverse valve
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.
High
Higher
Cycle Parts