PURGING THE REFRIGERANT SYSTEM - TM-5-4120-347-140126

TM 5-4120-347-14

5-10. PURGING THE REFRIGERANT SYSTEM

(See figure 5-3.)

The refrigeration system must be purged with dry nitrogen before any brazing is performed on any component. A

flow of dry nitrogen at the rate of 1-2 cfm (0.028-0.57m3/minute) should be continued during all brazing operations to

minimize internal oxidation and scaling.

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 system has been discharged using a manifold as described in paragraph 5-9 proceed as follows:

Figure 5-3. Nitrogen Tank Connection.

5-8

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