TM 5-2420-231-23-3
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RECOVERY CONTINUED
4. Follow recovery station instructions and recover R-134a refrigerant.
Figure 1. Refrigerant Recovery.
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END OF TASK
EVACUATION
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CAUTION
Moisture will combine with metals in the refrigerant system and produce highly corrosive
by-products. The by-products are oxides, iron hydroxide, and aluminum hydroxide, and
they will damage the A/C system.
Moisture in the A/C system can freeze and damage the expansion valve and orifice tube.
If there is water in the system, the water must be removed.
Failure to follow these cautions may result in damage to machine.
NOTE
If replacement or repair of a component is necessary, refrigerant must be recovered from
A/C system.
If A/C system has lost any charge after a long period of time, refrigerant in A/C system
must be recovered.
Always perform evacuating procedure to remove all air and moisture from the A/C system.
Never give a system complete charge without first performing the evacuating procedure.
Evacuating the A/C system with a vacuum pump will boil and remove any water in the
system. Remove water from the A/C system by evacuating the system with a vacuum
pump.
1. Connect blue low-side hose (Figure 1, Item 3) on suction (low) side (Figure 1, Item 2) of A/C compressor
(Figure 1, Item 1).
2. Connect red high-side hose (Figure 1, Item 4) on discharge (high) side (Figure 1, Item 5) of A/C compressor
(Figure 1, Item 1).
3. Follow recovery station instructions to evacuate A/C system.
