PRESSURE TEST USING MANIFOLD IV. GAUGES This is a method where trouble is detected and repaired by using manifold gauge. The manifold gauge indicates the refrigeration cycle high and low pressure side pressures on the respective gauge. Based on the values the following conclusions can be inferred and further troubleshooting can be done. REPLACED PART AMOUNT OF COMPRESSOR OIL TO BE REPLENISHED (IN CC) Evaporator (front) 25 Condenser 40 Hoses 10 Pipes 10 NOTE When only charging refrigerant without replacing any component, replenish the same amount of measured oil when recovering refrigerant, if not measured, replenish 30cc oil. NOTE Make sure following conditions are fulfilled before getting the correct gauge readings. A/C inlet temperature (Ambient Temperature) 30° - 35° C (86° - 95° F) Blower speed High Temperature Control Full cold Reference value before AC operation at both high and low pressure sides 5-8 kg/ cm2 (0.5 - 0.8 MPa) LOW PRESSURE SIDE IN KG/CM2 ( M PA) HIGH PRESSURE SIDE IN KG/CM2 ( M PA) REMARKS SYMPTOMS POSSIBLE REASONS 1.5-2.5 (0.15-0.25) 14-16 (1.37-1.57) System pressure is normal Normal cooling AC system working normal 0.5-1.0 (0.05-0.1) 7-10 (0.69-0.98) Pressure low Insufficient cooling Refrigerant quantity too small. Gas leakage. Vacuum 5-6 (0.5-0.6) Refrigerant fails to circulate No cooling experienced Clogging of AC cycle. FATC 62
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