Panasonic CS-PE9CKE Service Manual page 74

CS-PE9CKE / CU-PE9CKE / CS-PE12CKE / CU-PE12CKE
Panasonic ilmalämpöpumput korjaa ja huoltaa pääkaupunkiseudulla: Jäähdytinpalvelu RefGroup Oy
11.1. Relationship between the condition of air conditioner and pressure
and electric current
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
11.2. Diagnosis methods of a malfunction of a compressor and a 4-way
valve
Nature of fault
Insufficient compressing of a compressor
Locked compressor
Inefficient switches of the 4-way valves
Cooling mode
Low Pressure High Pressure
Electric current during operation becomes approximately 80% lower than the normal level.
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.
The compressor has a humming sound.
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.
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Electric current Low Pressure
during operation
Symptom
74
Heating mode
High Pressure Electric current
during operation