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52
Condition of the air
conditioner
Insufficient refrigerant
(gas leakage)
Clogged capillary
tube
Short circuit in the
indoor unit
Heat radiation deficiency
of the outdoor unit
Insufficient
compression
Cooling mode
Low pressure
High pressure
Electric current
during operation
12.2.
Relationship between the condition of air conditioner and pressrue
and electric current
and electric current
12.3. Diagnosis methods of a malfunction of a compressor .
Nature of fault
Insufficient compressing
of a compressor
Locked compressor
Symptom
Electric current during operation becomes approximately 80% lower
than the normal level.
The discharge tube of the compressor becomes abnormally hot
(normally 70~90
than the normal level.
The discharge tube of the compressor becomes abnormally hot
(normally 70~90
).
The difference between high pressure and low pressure becomes
almost zero.
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.
The compressor has a humming sound.
the limit of an ammeter. In some cases, a breaker turns off.
The compressor has a humming sound.
Inefficient switches of
the 4-way valves
Electric current during operation becomes approximately 20% lower than
the normal valve.
The temperature difference between from the discharge tube to the 4-way
valve and from suction tube to the 4-way valve becomes almost zero.
the normal valve.
The temperature difference between from the discharge tube to the 4-way
valve and from suction tube to the 4-way valve becomes almost zero.
Low pressure
High pressure
Electric current
during operation
Heating mode
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