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REFRIGERANT OIL LEVEL CHECK When an air conditioning system is first assembled, all components (except the compressor) are refrigerant Example: On an A/C system the evaporator retains 60 ml. (2 oz.). The condenser retains 30 ml. (1 oz.) of 150 ml. minus 90 ml. equals 60 ml. (2.00 oz.). CAUTION: The refrigerant oil used in a R-134a A/C is unique. Use only oils which were designed to work with R-134a refrigerant. The oil VERIFY REFRIGERANT LUBRICANT LEVEL (1) Discharge refrigerant system using a recycling/ reclaiming equipment if a charge is present. (2) Disconnect refrigerant lines from A/C compres- sor. Cap the open lines to prevent moisture from (3) Remove compressor from vehicle. compressor, drain lubricant from compressor. (5) Add system capacity minus the capacity of components that have not been replaced. Refer to the charge ports on compressor. This is not to exceed 150 (6) Install compressor and connect refrigerant lines. Then evacuate and charge refrigerant system. (7) Most reclaim/recycling equipment will measure the lubricant being removed. This is the amount of into a clean container. Return the amount of lubricant measured from the old compres- THERMAL LIMITER SWITCH (1) Unplug Thermal Limiter wiring connector. an ohmmeter check for continuity between the two terminals. If no continuity is (3) The Thermal Limiter is calibrated to open and close at: • Open circuit (no continuity) at 122 to 128°C (252 to 262°F) • Close circuit (continuity) at 106 to 116°C (225 to 235°F) There is no serviceability of the thermal lim- iter switch. If the thermal limiter switch fails, SERVICE PROCEDURES EVACUATING REFRIGERANT SYSTEM NOTE: Special effort must be used to prevent mois- If a compressor designed to use R-134a refrigerant is left open to the atmosphere for an extended period If the refrigerant system has been open to the atmosphere, it must be evacuated before the system A/C COMPONENT REFRIGERANT OIL CAPACITIES COMPONENT NAME ml. oz. Total Air Conditioning System 150 ml. 5.00 oz. Condenser 30 ml. 1.00 oz. Evaporator 59 ml. 2.00 oz. Filter/Drier 30 ml. 1.00 oz. Line Blown 44 ml. 1.50 oz. JX HEATING AND AIR CONDITIONING 24 - 9 DIAGNOSIS AND TESTING (Continued) |