NEXON EV SERVICE MANUAL

FATC 35 Sr. No. OCCURANCE POSSIBLE CAUSE REMEDY 4 Refrigerant fails to circulate Condition • Air conditioner does not cool. Symp- toms in refrigerant cycle • Pressure on the low pressure side is vacuum • Pressure on the low pressure side is vacuum low. • Frost or dew is formed on the piping at the front and rear side of the receiver or the expansion valve. Cause • Moisture or dirt in the refrigerating cycle freezes or sticks to the expansion valve orifice, obstructing refrigerant flow. • Gas leaking from the heat sensitizing tube of the expansion valve obstructs refrigerant flow. Diagnosis • Blocked expansion valve orifice. Countermeasures • Allow to stand for some time and then resume op- eration to decide whether the blockage is caused by moisture or by dirt. If caused by moisture; re- move the moisture by repeated, Recharge new refrigerant to the specified amount. • If cased by dirt; remove the expansion valve and blow out the dirt with com- pressed air. If unable to remove the dirt, replace the expansion valve. Evacuate and charge new refrigerant to the specified amount. If caused by gas leaking from heat sensitiz- ing tube, replace the expansion valve 5 Expansion valve mal- functioning (opening too much). 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 Diagnosis • Excessive liquid refrigerant in the low pressure side piping. • Expansion valve opened too far. Countermeasures • Check the diaphram of ex- pansion valve. • If the diaphragm is proper, replace the expansion valve. 6 Faulty compression of compressor Condition • Air conditioner does not cool. Symp- toms in refrigerant cycle • Pressure on the low pressure sides is too high and pressure on the high pres- sure side is too low. Cause • There is leaking in the compressor Diagnosi s • 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.