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TM 10-4130-239-14
5-4.
REFRIGERATION SYSTEM SERVICE - PURGING (CONT)
WARNINGS
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 suffocate and therefore,
must also be discharged in a ventilated location.
NOTE
The refrigeration system must be purged with dry
nitrogen, during any brazing/debrazing operation
performed on any component.
A flow of dry
nitrogen at less than 1-2 cfm (0.028-0.057
m3/minute) should be continued during all heating
operations to minimize internal oxidation and
scaling.
After the system has been discharged using a service manifold as
described in paragraph 5-3, proceed as follows:
1.
2.
3.
See specific component removal/repair instructions.
Connect the high side charging hose from the service manifold to
a nitrogen regulator and dry nitrogen tank.
The hose from the discharge service port to the service manifold
must be connected.
5-7
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