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 TM 9-4120-425-14&P
TUBING AND FITTINGS DIRECT SUPPORT
0079-00
MAINTENANCE REPLACEMENT - Continued
TEST
4.
Check all piping and connections with a General Electric Type H-2 halogen test detector (or approved equal).
5.
Calibrate the detector with a General Electric LS-20 leak standard (or approved equal) for a pure refrigerant leak
rate of 0.1 ounce (2.8349 gms) per year.
6.
Replace any piping or connection that is leaking beyond the rate of 0.1 ounce (2.8349 gms) per year.
REMOVAL
3.
Debraze and remove tubing only when necessary to remove a defective part.
4.
When brazing, constantly purge the refrigerant system with dry nitrogen to prevent scale formation within the
refrigerant system. (See WP 0051-00).
INSTALLATION
8.
Braze all copper-to-copper joints with silver solder (Item 21, Table 1, WP 0121-00).
9.
Braze all copper-to-brass or copper-to-steel with silver solder.
10. Braze melting point is 1160F(625C).
11. Make all braze joints with an atmosphere of inert gas to prevent internal oxidation (See WP 0051-00).
12. Replace filter-drier prior to leak testing. See WP 0066-00.
13. Service refrigeration system after repairs (See WP 0049-00 through WP 0055-00).
14. Secure top cover and lower panel (See WP 0019-00).
END OF TASK
0079-00-3
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