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TM5-4120-375-14
5-14. REPLACING TUBING,
Purge system with
to 1200 F creates
FITTINGS OR REFRIGERANT COMPONENTS.
WARNING
dry nitrogen prior to
phosgene gas.
soldering refrigerant heated
WARNING
Dry nitrogen is always used to purge the refrigeration system during
brazing or debrazing of connections to prevent internal oxidation
scaling.
NOTE
A careful; analysis of any trouble should first be made to determine if
replacement is necessary. The cause of failure must be determined
before replacement is made.
a.
SYSTEM DISCHARGE.
Discharge system in accordance with paragraph 5-12 and 5-13.
b.
DEBRAZING JOINTS.
(1).
Connect a cylinder of dry nitrogen (item 8,table D) to
the gauge port of the suction service valve.
Open the
cylinder shutoff valve and the suction service valve slightly,
and completely open the discharge service valve to purge the
system of refrigerant gas.
Use 1-2 cfm (0.1 to 1.02 M 3/minute.
(2).
Unbraze those joints which must be removed in order to
replace the tubing, fitting, or refrigerant components that is
defective.
5-10
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