TM9-4120-400-14
5-11.
PURGING THE REFRIGERANT SYSTEM. - contlnued
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 yellow 1/4 inch (charge) hose to a nitrogen regulator and dry nitrogen cylinder.
2.
Disconnect the blue (compound gauge) hose from the service manifold.
Be sure the service manifold compound gauge and vacuum valves are closed.
3.
4.
Be sure that unit high and low pressure charging 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 blue hose attached to the LOW PRESSURE CHARGING VALVE to be sure that no
oil is being forced out of the system.
When purging is completed, close nitrogen cylinder valve.
8.
Disconnect the yellow 1/4 inch (charge) hose from nitrogen regulator.
9.
10
Connect the blue (compound gauge) hose to service manifold.
NOTE
FOLLOW-ON MAINTENANCE:
5-29