TM 9-4120-407-14
4-13. PURGING THE REFRIGERANT SYSTEM. (Cont)
(2) Disconnect the compound gauge hose from the service manifold.
(3) Be sure the service manifold compound gauge and vacuum valves are closed.
(4) Be sure that discharge and suction service valves are open.
(5) Open the service manifold pressure gauge and charge valves.
(6) Open the nitrogen cylinder valve and adjust the regulator so that approximately 1-2 cfm
(0.028 - 0.057 m3/minute) of nitrogen flows through the system.
(7) Check discharge from the hose attached to the suction service valve to be sure that no oil is being
forced out of the system.
(8) When purging is completed, close nitrogen cylinder valve.
(9) Disconnect the charge hose from nitrogen regulator.
(10) Connect the compound gauge hose to service manifold.
NOTE
FOLLOW-ON MAINTENANCE:
4-32