Cautions

Caution
Always use separate refrigerant recovery, recycling and recharging service equipment for R-12 and R-134a systems. If the same piece of equipment is used for both R-12 and R-134a systems, residual traces of refrigerant will contaminate and damage the equipment. Service equipment includes recovery, recycling, recharging station, vacuum pump, manifold gauges, etc.

Caution
Do Not blow compressed air and nitrogen through the compressor. Refrigerant circuits retrofitted to use R-134a must not be rinsed with agent R-11.

Replacement compressors are filled with nitrogen. When updating replacement compressors prior to system retrofit, relieve nitrogen charge by carefully loosening protective caps on suction and discharge ports. If gas does not escape when removing protective caps, assume leakage and do not install compressor.

Always replace accumulator if refrigerant circuit is left open.

Due to residual amounts of mineral based refrigerant oil in systems retrofitted to use refrigerant R-134a, the newly installed PAG refrigerant oil will discolor immediately after use. This is normal and does not indicate a refrigerant related fault.