TM 5-3805-292-23
0093
LEAK TEST
00093
N OT E
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 determine 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 s stem are more easily found if the A/C has been
y
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 system 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.
END OF TASK
RECOVERY
00093
N OT E
Refrigerant identifier will pevent other refrigerants from contaminating R-134a recovery
r
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, rerigerant must be recovered before A/C system
f
components are removed.
1. Use refrigerant identifier to ensure refrigerant in A/C system is R-134a.
2. Make sure both manifold gauge set (Figure 1, Item 3) and valves (Figure 1, Items 2 and 4) are closed. Turn
valves clockwise to close.
3. Install manifold gauge set (Figure 1, Item 3) on low-side hose (Figure 1, Item 7) to suction (low) side of A/C
4. Install manifold gauge set (Figure 1, Item 3) on high-side hose (Figure 1, Item 5) to discharge (high) side of
A/C compressor.
5. Attach charging hose (Figure 1, Item 6) to recovery station inlet (Figure 1, Item 1).
N OT E
One valve is for vapor and the other valve is for liquid.
6. Ensure valves on refrigerant recovery tank (Figure 1, Item 8) are open.
7. Follow recovery station OEM instructions and recover R-134a refrigerant.
0093-2
