TM 5-3805-292-23
0093
CHARGING
00093
WARN I N G
Contact with refrigerant can cause frostbite. Keep hands and face away to prevent
personal injury.
Protective face shield and gloves must always be worn when refrigerant lines are opened,
even if the gauges indicate system is empty.
Always use caution when disconnecting fititngs. Slowly loosen the fitting in a well-
ventilated area.
Do not smoke when servicing A/C or wherever refrigerant gas may be present.
Failure to follow these warnings may result in injury or death to personnel.
C AU T I O N
DO NOT charge the A/C system with liquid refrigerant through the compressor suction
ports. This could seriously damage the compressor.
N OT E
Charging should be performed at air temperatures of 70F (21C) and above. Changes in
ambient air temperature will affect the system's ability to take a charge and will vary gauge
readings.
When adding a partial charge to the A/C system, if there is no evidence of air in the system
and there are no system leaks, it is not necessary to discharge and evacuate the A/C
system.
Operating A/C system periodically during the off-season will lubricate the seals and reduce
the possibility of refrigerant loss.
Up to 7 oz (200 g) of refrigerant loss per year is considered normal.
If a partial charge is being done, perform only steps 1 through 3.
1. Install manifold gauge set (Figure 3, Item 7) and connect low-side hose (Figure 3, Item 3) to suction (low) side
of A/C compressor.
2. Install manifold gauge set (Figure 3, Item 7) and connect high-side hose (Figure 3, Item 2) to discharge (high)
side of A/C compressor.
3. Connect charging hose (Figure 3, Item 6) to R-134a refrigerant tank valve (Figure 3, Item 5).
C AU T I O N
DO NOT invert the R-134a refrigerant tank while charging the system. Liquid refrigerant
entering the low side of the A/C system will permanently damage the compressor.
4. Ensure R-134a refrigerant tank (Figure 3, Item 4) stands upright vertically, to ensure only refrigerant vapor can
be charged into A/C system.
5. Open refrigerant tank valve (Figure 3, Item 5) on R-134a refrigerant tank (Figure 3, Item 4).
6. Start engine (TM 5-3805-292-10).
7. Set A/C controls to HIGH COOL (TM 5-3805-292-10).
0093-6
