TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 694 of 1258
1 4 - 1 7 . AIR-CONDITIONING SYSTEM SERVICING (Cont'd)
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.
NO T E
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.
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.
NO T E
• Do not attempt to use FR-12 or R-12 as a flushing agent. FR-12 or
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.
TM 9-2320-280-34
1 4 - 9 4
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