TM 9-4120-402-14
5-12. PURGING THE REFRIGERANT SYSTEM. - continued
Purge.
WARNING
The pressure in a nitrogen cylinder can exceed 2000 psi. A nitrogen pressure regulator should
be used at all times to avoid personal injury.
Nitrogen is an inert gas that can cause suffocation and must be discharged in a well ventilated
area.
(1)
Connect the charge hose to a nitrogen regulator and dry nitrogen cylinder.
(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 unit 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:
5-37