PURGING THE REFRIGERANT SYSTEM

TM 5-4120-359-14

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.

CAUTION

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