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HA-14 < SYMPTOM DIAGNOSIS > REFRIGERATION SYSTEM SYMPTOMS SYMPTOM DIAGNOSIS REFRIGERATION SYSTEM SYMPTOMS Trouble Diagnosis For Unusual Pressure INFOID:0000000008968519 Diagnose using a manifold gauge set whenever refrigerant pressures are unusual. The marker above the gauge scale in the following table indicates the standard (usual) pressure range. Refer to . Symptom Table INFOID:0000000008968520 Gauge indication Refrigerant cycle Probable cause Corrective action Both high and low-pressure sides The pressure returns to nor- Overfilled refrigerant. Recover refrigerant, evacuate . Air flow to condenser is insuf- Insufficient condenser cooling stallation of air guides. • Clogged or dirty condenser fins. • Repair or replace malfunc- tioning parts. • Clean and/or repair condens- er fins. When compressor stops, 2 , 28 psi), then gradually decreases. Air mixed with refrigerant. Recover refrigerant, evacuate . • Low-pressure pipe is cooler than the outlet of evapora- • Low-pressure pipe is frost- ed. Expansion valve opened too Replace expansion valve. Refer High-pressure side is excessively High-pressure pipe and upper Clogged or crushed high-pres- Repair or replace the malfunc- High-pressure side is too low and • The readings of both sides become equal soon after • There is no temperature dif- ference between high and Malfunctioning compressor (in- nal components. • Malfunctioning gaskets. Replace compressor. Refer to HA-25, "Removal and Installa- . AC359A AC360A AC356A |