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Model No: AC -S7CK_S7HK
Version 1.0
2. RELATION BETWEEN THE CONDITION OF THE AIR CONDITIONER AND
PRESSURE AND ELECTRIC CURRENT IN COOLING OPERATION
l Carry out the measurements of pressure, electric current and temperature fifteen
minutes after an operation is started.
Condition of the air conditioner Lower pressure High pressure
Electric current during
operation
Insufficient refrigerant
(gas leakage)
Decreased Decreased Decreased
Clogged capillary tube or
strainer
Decreased Decreased Decreased
Short circuit in the indoor unit Decreased Decreased Decreased
Heat radiation deficiency of the
outdoor unit
Increased Increased Increased
Inefficient compression Increased Decreased Decreased
3. DIAGNOSIS METHODS OF A MALFUNCTION OF A COMPRESSOR
Nature of fault Symptom
Inefficient compressing of
a compressor
F Electric current during operation becomes approximately
20% lower than the normal value.
F The discharge tube of the compressor becomes abnormally
hot (normally 70 to 90)
F The difference between high pressure and low pressure
becomes almost zero.
Locked compressor F Electric current reaches a high level abnormally, and the
value exceeds the limit of an ammeter . In some cases, a
breaker turns OFF.
F The compressor has a humming sound.
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