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 TM 9-2320-303-24-2
AIR CONDITIONING SYSTEM REFRIGERANT (R-134A) MAINTENANCE - CONTINUED
0297 00
PURGING
NOTE
Dry nitrogen gas is recommended for purging. A pressure regulator is required to regulate between 0 to 200
psi (0-1379 kPa). Commercial cylinders of nitrogen contain pressures in excess of 2000 psi (13,780 kPa);
this pressure must be reduced to 200 psi (1379 kPa) for purging.
1.
Recover system refrigerant.
2.
Disconnect both ends of line or part being purged. Tightly cap rest of system.
3.
Ensure valves (8, 7, and 11) are closed.
8
9
7
10
A
11
12
11
10
B
B
To Recycling System Container
A
To Waste Container
9
Nitrogen Bottle Regulator/Gage
7
Purging Control Valve
10
Drain Line
8
Nitrogen Bottle Control Valve
12
Nitrogen Bottle
11
Supply Line Valve
4.
Connect supply line valve (11) to outlet end of part or line.
5.
Connect drain line (10) to inlet end of part or line.
6.
Place outlet of drain line (10) into a recycling system container.
0297 00-4
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