Discharging System

R-134a systems require use of special service equipment designed specifically for R-134a systems. R-12 servicing equipment cannot be used on R-134a systems.
The use of refrigerant recovery and recycling stations allows recovery and reuse of refrigerant after contaminants and moisture have been removed.

When using recovery or recycling station follow manufacturers operating instructions, noting the following:

1. Use extreme caution and observe all safety and service Technician Safety Information related to refrigerant use.
2. Connect refrigerant recycling station hose(s) to vehicle A/C service port(s) and recovery hose to inlet fitting. Hoses used should have shutoff devices or a check valve within 12 inches of hose ends to minimize introduction of air into recycling station and to minimize amount of refrigerant release when hose(s) is disconnected.
3. Turn recycling station On to start recovery process. Allow recycling station to pump refrigerant from A/C system until station pressure gauge indicates vacuum.
4. After vehicle A/C system has been evacuated, close station inlet valve, if equipped.
5. Turn station off. On some stations, pump will automatically be turned off by low pressure switch.
6. Allow vehicle A/C system to remain closed for approximately two minutes. Observe vacuum level indicated on gauge. If pressure does not rise, disconnect recycling station hose(s).
7. If system pressure rises, repeat steps 3 through 6 until vacuum level remains stable for two minutes.
8. Service A/C system as required, then evacuate and recharge A/C system.