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5 MVAC retrofitting procedure Refer to the manufacturer’s retrofit procedures whenever available. The following are recommended procedures, specifically for retrofitting R12 MVAC systems to a R134a system: 1 - Check for leaks using a hand-held leak detector (refer also to SAE J1628: 2003) and set to detect R12 and/or use the soap bubble test. Make repairs if necessary. 2 - Run the vehicle to obtain suction and discharge pressures, which should be noted, and check again for leaks. 3 - Recover the entire refrigerant from the system following the standard procedure for CFC refrigerant recovery and store in a specified refillable container which is properly labelled. 4 - Remove the compressor from its mounting bracket and drain its lubricating oil. 5 - Rinse the internal parts by pouring alternative oil for new refrigerant into the compressor and manually rotating the compressor shaft. The amount of oil for rinsing is about 50% of the recommended factory oil charge. 6 - Repeat the oil rinsing procedure as necessary. 7 - Pour the proper amount of alternative refrigerant oil into the compressor as per the original equipment manufacturer (OEM) recommendations, and cap the suction and discharge lines until the system is ready for re-assembly. 8 - Flush the entire system with oxygen-free dry nitrogen and any cleaning agent not containing an ODS. 9 - Carry out tightness tests for each component for leaks. Repair or replace if necessary. 10 - Replace the expansion device and the filter drier with ones that are compatible with the alternative refrigerant. 11 - Change all flare type to O-ring type fittings. 12 - Replace all O-ring seals on pipes and hoses with those approved for R134a and PAG oils. 13 - Re-install and assemble system components. 14 - Modify the access valves/fittings to accept only the new alternative refrigerant fittings. 15 - Evacuate system to at least 1000 microns using the appropriate vacuum pump and an electronic vacuum gauge. Make corrections if necessary. 16 - Charge the system with the alternative refrigerant (SAE J1657: 2003) as recommended by the manufacturer whenever possible. Notice that the optimum charge will change when systems are retrofitted. 17 - Run the vehicle to observe the system operation and check again for leaks. 18 - Compare the new set of performance data to that obtained when the system was still using CFC. 19 - Label the system clearly. 117 RetrofittingPDF Image | Manual for Refrigeration Servicing Technicians
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