SAFARI STORME MY14

HVAC 44 REFRIGERATION CYCLE TROUBLESHOOTING Sr. No. Possible Cause Remedy 5 Expansion valve mal- functioning (opening too much) and im- proper installation of heat sensitizing tube. Condition x Air conditioner does not cool effective- ly. Symptoms in refrigerant cycle x Pressure on both the low and high. pressure sides is high. x Frost or heavy dew is formed on the piping on the low pressure side. Cause x The expansion valve is malfunctioning or the heat sensitizing tube is improp- erly installed. x Flow control is not properly performed Diagnosis x Excessive liquid refrigerant in the low pressure side piping. x Expansion valve opened too far. Countermeasures x Check the installation of the heat sensitizing tube. x If the installation is proper, replace the expansion valve. 6 Faulty compression of compressor Condition x Air conditioner does not cool. Symptoms in refrigerant cycle x Pressure on the low pressure sides is too high and pressure on the high pressure side is too low. Cause x There is leakage in the compressor Diagnosis x Faulty compression of compressor. x Delivery valve or packing is leaking or broken or compressor is malfunction- ing. Countermeasures x Check the compressor oil for contamination and quantity. x Replace the compressor.