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 TM 5-4120-393-14
5-10. Purging Refrigerant System (cont)
SERVICE
Purge System. Assuming that the system has been discharged using a manifold as described in paragraph 5-9, proceed
as follows.
a.
See specific component removal/repair instructions.
b.
Be sure that refrigerant has been discharged. See para 5-9.
c.
Connect the center hose from the charging manifold to a nitrogen regulator and dry nitrogen tank.
d.
Connect the hose from the high pressure service valve to the charging manifold.
e.
Disconnect the hose from the low pressure service valve and from the charging manifold.
f.
Open both service valves on the unit.
g.
Close the unused valve on the charging manifold, and open the one with the nitrogen tank hook up.
3
h.
Open the nitrogen cylinder valve and adjust the regulator so that less than 1-2 cfm (0 028-0.057 m /minute) of
nitrogen flows through the system.
i.
Check discharge from hose attached to the low pressure charging valve to be sure that no oil is being forced out
of the system.
3
j.
Allow nitrogen to sweep through the system at the rate of less than 1-2 cfm (0.028-0.057 m /minute) for a
minimum of 5 minutes before starting any brazing or debrazing operation. Then allow it to continue to flow at the
same rate until brazing or debrazing operations are completed. (See paragraph 5-11 for brazing or debrazing
procedures.)
5-20 Change 1
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