Refrigerant Recovery
REFRIGERANT RECOVERYIf Rotunda R-134a Service Center 176-00001 or equivalent is used, the following general procedures should be observed, in addition to the operating instructions provided by the equipment manufacturer.
WARNING: Use extreme care and observe all safety and service precautions related to the use of refrigerants.
1. Connect the Rotunda R-134a Service Center 176-00001 or equivalent hose(s) to the vehicle service gauge ports and the R-134a Service Center inlet fitting.
NOTE: Hoses should have shutoff devices or check valves within 305mm (12 inches) of the hose end to minimize the introduction of non-condensable gases (air) into the R-134a Service Center 176-00001, as well as to minimize the amount of refrigerant released when the hoses are disconnected.
2. Turn on the power to the R-134a Service Center 176-00001 to start the recovery process. Allow the recovery station to pump the refrigerant from the system until the station pressure goes into a vacuum. On some stations, the pump will be shut off automatically by a low-pressure switch in the electrical system. On other units, it may be necessary to manually turn off the pump.
3. Once the R-134a Service Center 176-00001 has recovered the vehicle A/C system refrigerant, close the station inlet valve (if so equipped). Then switch off the power supply.
4. Allow the vehicle A/C system to remain closed for about two minutes. Observe the system vacuum level as shown on the gauge. If the pressure does not rise, disconnect the recovery station hose(s).
5. If the system pressure rises, repeat steps 2, 3, and 4 until the vacuum level remains stable for two minutes.
6. Perform the required service operations, then evacuate and recharge the A/C system.