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Page Title:
REFRIGERATION SYSTEM SERVICING - (PURGING). |
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 TM 5-4120-386-14
This task covers: Service
INITIAL SETUP
Equipment
Condition
Condition Description
Para
Refrigerant system discharged.
Main power source disconnected.
Materials/Parts
Nitrogen (App. D. Item 4)
LOCATION/ITEM
ACTION
REMARKS
The refrigeration system must be
purged with dry nitrogen, App. D,
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 oxidation and
scaling.
Nitrogen cylinders are pressurized
containers. The pressure in the
cylinder can exceed 2000 PSI.
A nitrogen pressure regulator
should be used at all times when
nitrogen is used for leak check
or purge operations.
Nitrogen is an inert gas. However,
it also presents danger as a suffocant
and therefore, must also be discharged
in a ventilated location.
5-35
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