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5-7.
TM5-4120-377-14
NOTE
In accordance with Environmental Protection Agency regulations refrigerants cannot be
discharged into the atmosphere. A refrigerant recovery & recycling unit must be used
whenevr discharging the refrigerant system.
Operation of the recover/recycling unit must be by AUTHORIZED PERSONNEL ONLY
f. Connect and operate a recovery/recyclingunit in accordance with the manufacturer’s instructions.
Preliminary procedure:
Discharge the refrigerant system. (See para 5-6.)
Supplies:
Nitrogen cylinder (item 4, Appendix E)
The refrigeration system must be purged with dry nitrogen, item 4, Appendix E, before any brazing is 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.
Assuming that the systems has been discharged using a manifold as described in paragraph 5-6, proceed as follows:
a. See specific component removal/repair instructions.
b. Be sure that refrigerant has been discharged. (See paragraph 5-6.)
5-9
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