TM 9-2320-302-34
0112 00-4
AIR CONDITIONING SYSTEM REFRIGERANT (R-134A) MAINTENANCE - CONTINUED
0112 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 (1, 2, and 3) are closed.
4.
Connect supply line valve (3) to outlet end of part or line.
5.
Connect drain line (4) to inlet end of part or line.
6.
Place outlet of drain line into a recycling system container.
3
4
4
6
5
2
1
A
To Waste Container
1
Nitrogen Bottle Control Valve
2
Purging Control Valve
3
Supply Line Valve
B
To Recycling System Container
4
Drain Line
5
Nitrogen Bottle Regulator/Gage
6
Nitrogen Bottle
A
3
B
