TM 9-4120-378-14
REFRIGERATION SYSTEM SERVICING- (PURGING). This task covers service.
INITIAL SETUP
Material/Part:
Equipment Conditions:
Nitrogen (Appendix E, Item 4)
Refrigerant system discharged (paragraph 5.4)
Main power source disconnected
Remarks
Action
Location/Item
I
Disconnect air conditioner power sup-
ply before doing maintenance work on
or near electrical system.
The refrigeration system must be
purged with dry nitrogen, Appendix E,
Item 4, during any brazing operation
performed on any component. A flow
of dry nitrogen at the rate of less than
1 - 2 cfm (0.028-0.057 m3/minute)
should be continued during all brazing
operations to minimize internal oxida-
tion and scaling.
Nitrogen cylinders are pressurized
containers. The pressure in the cylin-
der can exceed 2000 psi. A nitrogen
pressure regulator should be used at
all times when nitrogen is used for leak
check or purge operations.
