4-6. PURGING THE REFRIGERANT SYSTEM
Preliminary Procedure: 1. Remove air conditioner from shelter, if necessary. (See paragraph 3-6.)
2. Discharge the refrigerant system. (See paragraph 4-5.)
Supplies: Dry nitrogen gas (item 2, Appendix E).
The refrigeration system must be purged with dry nitrogen, item 2, 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.
Figure 4-5. Nitrogen Purging Connection
Change 4 4-27
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