TM 9-4120-378-14
5.8 REFRIGERATION SYSTEM SERVICING- (EVACUATION). This task covers evacuation.
INITIAL SETUP
Material/Part:
Equipment Conditions:
Nitrogen (Appendix E, Item 4)
Refrigerant system leak tested (paragraph 5.7)
Refrigerant system discharged (paragraph 5.4)
Test Equipment:
Vacuum pump
Remarks
Location/Item
Action
Disconnect air conditioner power sup-
ply before doing any maintenance
work on the electrical system.
NOTE
Replace dehydrator whenever refriger-
ant system is opened.
Do not evacuate a leaking system.
The vacuum created can cause air,
moisture, and dirt to enter system.
NOTE
See paragraph 5.27.
In the event the compressor was re-
placed as a result of burnout, check that
compressor burnout procedures were
followed.
a.
Connect the hose from the low pressure service
valve to the compound gage side of the charging
manifold. The hose from the high pressure service
valve shall be connected to the high pressure gage
side of the charging manifold.
Open both service valves.
b.
c.
Attach center hose assembly charging manifold to
vacuum pump.
d.
Start vacuum pump.
