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Page Title:
REFRIGERATION SYSTEM SERVICING - (PURGING). - continued |
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 TM 5-4120-386-14
5-11. REFRIGERATION SYSTEM SERVICING (PURGING) - Continued.
LOCATION/ITEM
REMARKS
ACTION
Assuming that the system has
been discharged using a manifold
as described in paragraph 5-10,
proceed as follows:
See specific component removal/
a.
repair instructions.
b.
Be sure that refrigerant has
been discharged. (See paragraph
c.
Connect the center hose from the
charging manifold to a nitrogen
regulator and dry nitrogen tank.
d.
The hose from the high pressure
service valve to the charging
manifold must be connected.
The hose from the low pressure
e.
service valve must be disconnect-
ed from the charging manifold.
f.
Open both service valves on the
unit.
Close the unused valve on the
g.
charging manifold, and open the
one with the nitrogen tank hook-
ed up.
h.
Open the nitrogen cylinder valve
and adjust the regulator so that
less than 1-2 cfm (0.028-0.057
through system.
i.
Check discharge from hose attach-
ed to the low pressure service
valve to be sure that no oil is
being forced out of the system.
Allow nitrogen to sweep through
j.
the system at the rate of less
than 1-2 cfm (0.028-0.057 m3/
minute) for a minimum of 5 min-
utes, before starting any brazing
operation. Then allow it to
continue to flow at the same rate
until all brazing operations are
completed. (See paragraph 5-12
for brazing/debrazing procedures.)
5-36
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