13. Defect and its cause
13.1 Diagnosis of defects on refrigerant system
(1) Table of defect and cause of refrigerant system
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High pressure is high.
Low pressure is low.
Low pressure is high.
Bubble can be seen in sight glass.
Compressor becomes frosted.
Compressor will not suck.
Compressor will not maintain sucking pressure
Compressor gives off sound.
No capability of refrigeration
Defrost can not be made.
Overcharge of refrigerant
Shortage of refrigerant
No refrigerant
Return air temperature by condenser is too high.
Clogging of condenser
Return air temperature by condenser is too low.
Air is mixed in refrigeration cycle
Stopping of condenser fan
Clogging of evaporator
Defrost of evaporator is required.
Leakage of compressor delivery valve
Leakage of inlet valve
Excessive circulation amount of refrigeration machine oil
Inadequate tightening of compressor and magnet clutch
Compressor bearing is defective.
Compressor valve plate is broken.
Thermo bulb of expansion valve is defective.
Installation of thermo bulb of expansion valve is defective.
Excessive opening of expansion valve
Excessive closing of expansion valve
Clogging of expansion valve
Liquid back
Low pressure side is clogged.
High pressure side is clogged
Defect
Cause
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