Diagnosis Methods Of A Malfunction Of A Compressor - Panasonic CS-YC9MKV Service Manual

12.1.1 Relationship between the condition of the air conditioner and pressure and
electric current
Condition of the
air conditioner
Insufficient refrigerant
(gas leakage)
Clogged capillary tube or
strainer
Short circuit in the indoor unit
Heat radiation deficiency
of the outdoor unit
Inefficient compression
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.

Diagnosis methods of a malfunction of a compressor

Nature of fault
Insufficient compressing
of a compressor
Locked compressor
Low Pressure
Electric current during operation becomes approximately 20% lower thank the normal value.
The discharge tube of the compressor becomes abnormally hot (normally 70℃ to 90℃ )
The different between high pressure and low pressure becomes almost zero.
Electric current reaches a high level abnormally, and the value exceeds the limit of an ammeter. In
some cases, a breaker turns off.
Then compressor has a humming sound.
Cooling Mode
High Pressure
Symptom
32
Electric current during operation