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HA-118 < SYMPTOM DIAGNOSIS > [TYPE 3] REFRIGERATION SYSTEM SYMPTOMS SYMPTOM DIAGNOSIS REFRIGERATION SYSTEM SYMPTOMS Trouble Diagnosis For Unusual Pressure INFOID:0000000010707266 Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The Symptom Table INFOID:0000000010707267 Gauge indication Refrigerant cycle Probable cause Corrective action Both high- and low-pressure sides The pressure returns to nor- Overfilled refrigerant. Collect all refrigerant, evacuate Air flow to condenser is insuf- Insufficient condenser cooling and condenser. • Improper installation of air guide. • Clogged or dirty condenser fins. • Repair or replace malfunc- tioning parts. • Clean and repair condenser fins. When compressor is stopped, cm 2 , 28 psi). It then gradually decreases. Air mixed in refrigerant cycle. Collect all 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. 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 Malfunction in compressor sys- valve. • Malfunctioning gaskets. Replace compressor. AC359A AC360A AC356A |