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11.1. Relationship between the condition of air conditioner and pressure
and electric current
Cooling mode
Heating mode
Condition of the air
conditioner
Low Pressure
High Pressure
Electric current
during operation
Low Pressure
High Pressure
Electric current
during operation
Insufficient refrigerant
(gas leakage)
Clogged capillary tube
Short circuit in the
indoor unit
Heat radiation
deficiency of the
outdoor unit
Insufficient compression
11.2. Diagnosis methods of a malfunction of a compressor and a 4-way
valve
Nature of fault
Symptom
● Electric current during operation becomes approximately 80% lower than the normal level.
Insufficient compressing of a compressor
● The discharge tube of the compressor becomes abnormally hot (normally 70~90°C).
● The difference 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.
Locked compressor
● The compressor has a humming sound.
● Electric current during operation becomes approximately 20% lower than the normal valve.
Inefficient switches of the 4-way valves
● 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.
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CS-SA9CKP CU-SA9CKP5 / CS-SA12CKP CU-SA12CKP5
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