NOTE: R–12 refrigerant is a chlorofluorocarbon which
when released in the atmosphere can contribute to the depletion of the ozone
layer in the upper atmosphere. Ozone filters out harmful radiation from the
sun. Consult laws in your area before servicing the air conditioning system.
In some states it is illegal to perform repairs involving refrigerant unless
the work is done by a certified technician
The use of refrigerant recovery systems and recycling stations makes possible
the recovery and reuse of refrigerant after contaminants and moisture have been
removed. If a recovery and recycling station is available, the following general
procedures should be observed, in addition to the operating instructions provided
by the equipment manufacturer.
- Check the system for pressure using the manifold gauge set. Take note, if
a recovery system is used to draw refrigerant from the system that is already
ruptured and open to the atmosphere, only air may be pulled into the tank.
- Connect the recycling station hoses to the vehicle's air conditioning service
ports and the recovery stations inlet fitting.
NOTE: Hoses should have shut-off devices or check valves
within 12 in. (305mm) of the hose end to minimize the introduction of air
into the recycling station and the amount of refrigerant released when the
hoses are disconnected.
- Turn the power to the recycling station ON to start the
recovery process. Allow the 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 it's electrical
system. On other units it may be necessary to turn off the pump manually.
- Once the recycling station has evacuated the system, close the station inlet
valve. Then switch OFF the electrical power.
- Allow the vehicle air conditioning system to remain closed for about 2 minutes.
Observe the system vacuum level as shown on the gauge. If the pressure does
not rise, disconnect the station's hoses.
- If the system pressure rises, repeat Steps 3, 4 and 5 until the vacuum level
remains stable for 2 minutes.
- If A/C oil is expelled during the discharge procedure, measure the amount
discharged so the proper quantity of oil can be replaced when charging.
