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HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–77 1. Perform oil return operation. compressor. 3. Drain the compressor oil and measure the extracted oil. 4. Check the compressor oil for contamination. (Amount of oil drained (Charging amount of oil more than 90 cc (3.0 same as drained amount less than 90 cc (3.0 fl.oz) 90 cc (3.0 fl.oz) 6. Evacuate, charge and perform the oil return operation. 7. Check the system operation. Contamination of Compressor Oil Unlike engine oil, no cleaning agent is added to the D The capacity of the oil has increased. D The oil has changed to red. D Foreign substances, metal powder, etc., are present If any of these conditions exists, the compressor oil Oil Return Operation There is close affinity between the oil and the refrigerant. 1. Open all the doors and the engine hood. and set the fan control knob at its highest position. 3. Run the compressor for more than 20 minutes between 800 and 1,000 rpm in order to operate the 4. Stop the engine. Replacement of Component Parts When replacing the system component parts, supply the (Component parts to be (Amount of Oil) Evaporator 50 cc (1.7 fl. oz.) Condenser 30 cc (1.0 fl. oz.) Receiver/dryer 30 cc (1.0 fl. oz.) Refrigerant line (one 10 cc (0.3 fl. oz.) Compressor Leak Testing (External Bench-Check Procedure 1. Install test plate J-39893 on rear head of compressor. hose of manifold gage set on charging station to a 3. Connect charging station high and low pressure lines to corresponding fittings on test plate J-39893. 4. Open low pressure control, high pressure control and refrigerant control on charging station to allow 5. Using a leak detector, check for leaks at pressure relief valve, rear head switch location, compressor 6. If an external leak is present, perform the necessary corrective measures and recheck for leaks to make 7. Recover the refrigerant. compressor assembly. Rotate the complete 10. Install a M9 × 1.25 threaded nut on the compressor crankshaft if the drive plate and clutch assembly are 11. Using a box-end wrench or socket and handle, rotate the compressor crankshaft or clutch drive plate on the 12. Using Refrigerant Recovery System, connect the charging station high-pressure line to the test plate 13. Using Refrigerant Recovery System, connect the charging station low-pressure line to the low pressure |