TM 9-4120-370-14
TO 35E9-229-1
DISCHARGING THE REFRIGERANT SYSTEM - Continued.
5-7.
NOTE
In accordance with Environmental Protection Agency regulations refrigerants cannot be
discharged into the atmosphere. A refrigerant recovery and recycling unit must be used
whenever discharging the refrigerant system.
Operation of the recovery/recycling unit must be by AUTHORIZED PERSONNEL
ONLY.
g. Connect end operate a recovery/recycling unit in accordance with the manufacturer's instructions.
PURGING THE REFRIGERANT SYSTEM
Preliminary procedure:
Discharge the refrigerant system. (See para 5-7.)
Supplies:
Nitrogen cylinder (item 4, Appendix E)
The refrigeration system must be purged with dry nitrogen, item 4, Appendix E, before any brazing or debrazing is per-
formed on any component. A flow of dry nitrogen at the rate of less than 12 cfm (0.0280.057 m3/minute) should be
continued during all brazing or debrazing 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.
CAUTION
Nitrogen is an inert gas. However, it also presents danger as a suffocant and,
therefore, must also be discharged in a ventilated location.
