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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
1.
If system was pumped down, connect manifold red hose to expansion service valve (para 5-30).
2.
Connect yellow 1/4 inch (0.64 cm) charging hose (Figure 5-5) from charge port to nitrogen regulator and dry
nitrogen cylinder.
3.
Loosen low pressure hose (blue) at compound gauge port of service manifold.
4.
Open pressure gauge valve (PGV) on service manifold.
5.
Open charging valve (CV) on service manifold.
6.
Open the nitrogen cylinder valve and adjust the regulator so that less than 1-2 cfm (0.028-0.057 m3/minute) of
nitrogen flow rate is established.
7.
Check to insure that nitrogen is flowing from loosened hose at compound gauge port of service manifold.
8.
Allow nitrogen to sweep through the system for a minimum of 5 minutes before brazing or debrazing operations
are started; continue sweep during the operation and for 5 minutes after completion.
9.
Close nitrogen cylinder valve, service manifold valves and high and low pressure service valves on the unit.
10.
Disconnect hose from nitrogen regulator and return it to hose rack.
11.
Assuming that all repairs are completed, go to Leak Testing the Refrigerant System (para 5-15).
Figure 5-5.
Purging Refrigerant System
5-23
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