R-134A Retrofit, System Preparation

R-134A RETROFIT, SYSTEM PREPARATION

^ Review all Cautions, Warnings and A/C refrigerant system safety measures stated in appropriate model repair information, --> Repair Manual, Air Conditioning, Repair Group 87.

^ Always use Underwriter's Laboratory (UL) approved refrigerant service equipment such as Kent Moore ACR3, ACR4 or equivalent.

^ Before proceeding with retrofit, perform a visual inspection and functional test of complete A/C system; including instrument panel outlet temperature, air distribution, refrigerant system components, system pressure and leak test. --> Repair Manual, Air Conditioning, Repair Group 87. Repair/replace parts as necessary.

^ Always refer to the most recent parts information for affected models when replacing damaged or defective R-12 refrigerant system parts (including the routine replacement of O-rings).

^ If replacement of damaged or leaking refrigerant hoses, compressors, evaporators and condensers is necessary, blow compressed air (followed by nitrogen) through all remaining, disconnected, free flowing system components before assembly in order to remove moisture, impurities and remaining refrigerant oil.

^ If a component is replaced prior to retrofitting the system to R-134a, an appropriate amount of PAG refrigerant oil must be added to the circuit. For oil quantities per component, refer to Oil Distribution charts.

^ Replacement compressors are factory filled with R-12 compatible compressor oil. If compressor replacement is necessary, the factory filled compressor oil must be drained and replaced with appropriate quantity of PAG refrigerant oil;

Identify compressor type and fill according to table.