TM 9-2320-280-34
14-17. AIR-CONDITIONING SYSTEM SERVICING (R-12) (Cont'd)
d. Flushing System
CAUTION
Never flush air compressor. Flushing removes oil. Damage to
compressor will result if compressor is flushed.
Air-conditioning system flushing is essential when replacing failed
compressors. Failure to flush A/C system will result in damage to
new compressor.
NOTE
Do not attempt to use R-12 as a flushing agent. R-12 will not
remain a liquid at ambient temperatures. Use R-111 or R-113 for
flushing purposes.
Flushing is done to remove solid materials such as oil, sludge, and
metal particles from failed components.
For a complete system flush, tools must be installed at A/C lines
at compressor.
1.
Discharge A/C system (refer to task c.).
2.
Fill flushing cylinder with flushing agent.
WARNING
Eye protection must be worn when using nitrogen. Failure to do
so may result in injury to personnel.
3.
Pressurize cylinder with nitrogen to 100 psi (689.5 kPa).
4.
Connect flushing gun to flushing cylinder.
NOTE
Perform steps 5 through 7 on condenser, evaporator, and
refrigerant lines. Continue flushing until there is no evidence of
oil or contaminants.
5.
Insert flush gun into refrigerant outlet tube of components to be flushed.
6.
Connect a rubber hose over inlet of component to be flushed, and place other end of hose in a drain
pan.
7.
Open flush gun to blow cleaning agent through component.
8.
Remove rubber hose from component and plug line.
9.
Remove flush gun from component and plug line.
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