TB 9-2320-302-13&P-3
A/C SYSTEM MAINTENANCE - CONTINUED
0015 00
LEAK TEST
NOTE
If service work is required on an A/C system, the refrigerant must be recovered first before components
are removed.
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-
tem equalizes.
1.
Move leak detector sensor tip along possible leak points, at a rate of 1 in. per second.
2.
Leak detector will indicate if leak is present in A/C system.
RECOVERY
NOTE
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:
1.
Use refrigerant identifier to ensure refrigerant in A/C system is R-134a.
2.
Make sure both manifold gauge set (1) valves (2 and 3) are closed. Turn valves clockwise to close.
3.
Connect manifold gauge set (1) low-side hose (4) to suction (low) side of A/C compressor.
4.
Connect manifold gauge set (1) high-side hose (5) to discharge (high) side of A/C compressor.
5.
Attach charging hose (6) to recovery station inlet (7).
NOTE
One valve is for vapor and the other valve is for liquid.
6.
Ensure valves on refrigerant recovery tank (8) are open.
0015 00-2
