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13.2 Relationship between the condition of the air conditioner and pressure
and electric current
Cooling Mode
Heating Mode
Condition of the
air conditioner
air conditioner
Low Pressure
High
Pressure
Pressure
Electric current
during
operation
during
operation
Low Pressure
High
Pressure
Pressure
Electric current
during operation
during operation
Insufficient
refrigerant (gas
leakage)
refrigerant (gas
leakage)
Ô
Ô
Ô
Ô
Ô
Ô
Clogged capillary
tube or strainer
tube or strainer
Ô
Ô
Ô
Ô
Ô
Ô
Short circuit in the
indoor unit
indoor unit
Ô
Ô
Ô
Ò
Ò
Ò
Heat radiation
deficiency of the
outdoor unit
deficiency of the
outdoor unit
Ò
Ò
Ò
Ô
Ô
Ô
Inefficient
compression
compression
Ò
Ô
Ô
Ò
Ô
Ô
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is
started.
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.
z
Then compressor has a humming sound.
Insufficient switches of
the 4-way valve
z
Electric current during operation becomes approximately 80% lower than the normal value.
z
The temperature different between from the discharge tube to the 4-way valve and from suction tube
to the 4-way valve becomes almost zero.
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