A/C SYSTEM MAINTENANCE - CONTINUED
If service work is required on an A/C system, the refrigerant must be recovered first before components
The A/C system must contain at least 0.88 lb (0.4 kg) of refrigerant. The manifold gauge set can deter-
mine if pressure exists in the system.
Leaks that are in the high side of the A/C system are more easily found if the A/C is operated for 5 to 10
minutes. The leak test must be performed immediately after the unit is turned off. The leak test for the
high side needs to be performed before the pressure in the A/C system equalizes.
Leaks that are in the low side of the A/C system are more easily found if the A/C has been shut off for 5
to 10 minutes. The leak test for the low side needs to be performed before the pressure in the A/C sys-
Move leak detector sensor tip along possible leak points, at a rate of 1 in. per second.
Leak detector will indicate if leak is present in A/C system.
Refrigerant identifier will prevent other refrigerants from contaminating R-134a recovery and charging
tools. Refrigerant identifier will also detect a percentage of air that may be in the A/C system.
If service is required on the A/C system, refrigerant must be recovered before A/C system components
are removed. Use the following procedure:
Use refrigerant identifier to ensure refrigerant in A/C system is R-134a.
Make sure both manifold gauge set (1) valves (2 and 3) are closed. Turn valves clockwise to close.
Connect manifold gauge set (1) low-side hose (4) to suction (low) side of A/C compressor.
Connect manifold gauge set (1) high-side hose (5) to discharge (high) side of A/C compressor.
Attach charging hose (6) to recovery station inlet (7).
One valve is for vapor and the other valve is for liquid.
Ensure valves on refrigerant recovery tank (8) are open.