FATC 46 REFRIGERATION CYCLE TROUBLESHOOTING Sr. No. POSSIBLE CAUSE REMEDY 5 Expansion valve malfunctioning (opening too much) and improper installation of heat sensitizing tube. Condition • Air conditioner does not cool effectively. Symptoms in refrigerant cycle • Pressure on both the low and high. pressure sides is high. • Frost or heavy dew is formed on the piping on the low pressure side. Cause • The expansion valve is malfunctioning or the heat sensitizing tube is improperly installed. • Flow control is not properly performed Diagnosis • Excessive liquid refrigerant in the low pressure side piping. • Expansion valve opened too far. Countermeasures • Check the installation of the heat sensitizing tube. • If the installation is proper, replace the expansion valve. 6 Faulty compression of compressor Condition • Air conditioner does not cool. Symptoms in refrigerant cycle • Pressure on the low pressure sides is too high and pressure on the high pressure side is too low. Cause • There is leaking in the compressor Diagnosis • Faulty compression of compressor. • Delivery valve or packing is leaking or broken or compressor is malfunctioning. Countermeasures • Check the compressor oil for contamination and quantity. • Replace the compressor.
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