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HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–49 Major Checking Points of Refrigerant Leak Compressor • Pipe connection • Sealing section of shaft • Mating section or cylinder Condenser • Pipe connection • Welds of condenser body Receiver driver • Pipe connection • Attaching section of pressure switch • Section around the sight glass Evaporator unit (cooling unit) • Pipe connections • Connections of expansion valve • Brazed sections of evaporator • The evaporator and expansion valve are contained in the case. Remove the drain hose or the resistor of the Flexible hose • Pipe connection • Caulking section of the hose • Hose (cracks, pinholes, flaws) Pipe • Pipe connection • Pipe (cracks, flaws) Charge valve • The charge valve, which is used to connect the gauge manifold, is normally provided with a resin cap. When Leak at Refrigerant Line Connections 1. Check the torque on the refrigerant line fitting and, if too loose, tighten to the specified torque. • Use two wrenches to prevent twisting and damage to the line. • Do not over tighten. 2. Perform a leak test on the refrigerant line fitting. 3. If the leak is still present, discharge and recover the refrigerant from the system. 4. Replace the O-rings. • O-rings cannot be reused. Always replace with new ones. • Be sure to apply the specified compressor oil to the new O-rings. 5. Retighten the refrigerant line fitting to the specified torque. • Use two wrenches to prevent twisting and damage to the line. 6. Evacuate, charge and retest the system. Leaks In The Hose If the compressor inlet or outlet hose is leaking, the 1. Locate the leak. 2. Discharge and recover the refrigerant. 3. Remove the hose assembly. • Cap the open connections at once. 4. Connect the new hose assembly. • Use two wrenches to prevent twisting or damage to the hose fitting. • Tighten the hose fitting to the specified torque. 5. Evacuate, charge and test the system. Compressor Leaks If leaks are located around the compressor shaft seal or Recovery, Recycling, Evacuation and Air conditioning systems contain HFC-134a. This is a • Always wear safety goggles and protective gloves. • Always work in a well-ventilated area. Do not weld or steam clean on or near any vehicle-installed air • If HFC-134a should come in contact with any part of the body, flush the exposed area with cold water and • If it is necessary to transport or carry any container of HFC-134a in a vehicle, do not carry it in the • If it is necessary to fill a small HFC-134a container from a large one, never fill the container completely. • HFC-134a and R-12 should never be mixed as their compositions are not the same. • HFC-134a PAG oil tends to absorb moisture more quickly than R-12 mineral oil and, therefore, should • Keep HFC-134a containers stored below 40 ° C (100 ° F). |