PURGING THE REFRIGERANT SYSTEM. - TM-5-4120-384-140225

TM5-4120-384-14

5 - 1 2 . PURGING THE REFRIGERANT SYSTEM.

(See

The refrigeration system must be purged with dry nitrogent item

Appendix E before any brazing is performed on any components. A

flow of dry nitrogen at the rate of 1 - 2 cfm (0.028 - 0.057

m 3/ m i n u t e ) s h o u l d b e c o n t i n u e d d u r i n g a l l b r a z i n g o p e r a t i o n s t o

minimize internal oxidation and scaling.

The

Nitrogen cylinders are pressurized containers.

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.

Nitrogen Tank Connection

Figure

5-5.

5-26