13.2. Relationship between the condition of the air conditioner andpressure and electric currentCooling ModeCondition of the airconditioner Low Pressure High Pressure Electric current during operationInsufficient refrigerant (gasleakage)Clogged capillary tube orStrainerShort circuit in the indoor unitHeat radiation deficiency ofthe outdoor unitInefficient compression• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.13.3. Diagnosis methods of a malfunction of a compressorNature of fault Symptom• Electric current during operation becomes approximately 20% lower than the normal value.Insufficient compressing of a compressor • The discharge tube of the compressor becomes abnormally hot (normally 154 to 194°F).• 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 anammeter. In some cases, a breaker turns off.Locked compressor• The compressor has a humming sound.58CS-C9DKU CU-C9DKU / CS-C12DKU CU-C12DKU
