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13.2 Relationship between the condition of the air conditioner and pressure
and electric current
Cooling Mode
Condition of the
air conditioner
Low Pressure
High Pressure
Electric current during operation
Insufficient refrigerant
(gas leakage)
Ô
Ô
Ô
Clogged capillary tube or
strainer
Ô
Ô
Ô
Short circuit in the indoor unit
Ô
Ô
Ô
Heat radiation deficiency
of the outdoor unit
Ò
Ò
Ò
Inefficient compression
Ò
Ô
Ô
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.
13.3 Diagnosis methods of a malfunction of a compressor
Nature of fault
Symptom
Insufficient compressing
of a compressor
z
Electric current during operation becomes approximately 20% lower thank the normal value.
z
The discharge tube of the compressor becomes abnormally hot (normally 70℃ to 90℃ )
z
The different between high pressure and low pressure becomes almost zero.
Locked compressor
z
Electric current reaches a high level abnormally, and the value exceeds the limit of an ammeter. In
some cases, a breaker turns off.
some cases, a breaker turns off.
z
Then compressor has a humming sound.
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