SR NO OCCURANCE POSSIBLE CAUSE REMEDY 3 Entry of moisture in the refrigerant cycle Condition Air conditioner alternately cools and • does not cool. Symptoms in refrigerant cycle During operation, the pressure on the • low pressure side alternates between vacuum and normal. Cause The moisture mixed in the refrigerant in • the refrigerating cycle freezes in the expansion valve orifice, blocking the cycle. After a time, the ice melts and normal conditions return Diagnosis The drier is in an oversaturated • condition. The moisture in the refrigerating cycle • freezes the expansion valve orifice, impeding refrigerant circulation. Countermeasures Remove the • moisture by repeated evacuation. Recharge new • refrigerant to the specified amount. HVAC W/O ETC 29
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