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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
NOTE
The entire repaired area should be thoroughly leak tested after repair or replacement of
any component before it is recharged with refrigerant-22. Leak testing is also the
method for troubleshooting when a system has lost all or part of its refrigerant charge
through an undetermined cause.
1.
Open compound and pressure gauges. If system pressure is 50 psig or higher, proceed to step 6; if not,
continue with step 2.
2.
Disconnect nitrogen cylinder and connect yellow hose to R-22 cylinder.
3.
Open R-22 cylinder valve and let purge for 3-5 seconds.
4.
Open CV and PGV and allow refrigerant to enter system until compound and pressure gauges indicate a
minimum pressure of 50 psig, then close CV.
5.
Close R-22 refrigerant cylinder valve and remove yellow manifold hose.
6.
Install yellow hose to nitrogen cylinder (para 5-13).
7.
Open nitrogen cylinder valve and adjust regulator to a pressure 10 psi greater than system pressure.
8.
Loosen 1/4 inch (0.64 cm) yellow hose at charge port and purge for 3-5 seconds, then tighten.
9.
Open charge valve and adjust nitrogen regulator to slowly raise command and pressure gauge reading to 300
psig.
10.
Using a halon leak detector, check all fittings, connections and components in surrounding area for leaks. Insure
pressure remains at 300 psig by adding more nitrogen if necessary.
11.
Close CV and nitrogen cylinder valve.
12.
Open VPV and bleed pressure out of lines.
13.
Remove yellow hose from nitrogen regulator and connect to service manifold hose rack.
14.
Always perform a final leak test before the air conditioner is reassembled and the refrigeration system is
evacuated and charged.
5-27
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