In accordance with Environmental Protection Agency regulations refrigerants cannot be
discharged into the atmosphere. A refrigerant recovery and recycling unit must be used
Operation of the recovery/recycling unit must be by AUTHORIZED PERSONNEL
g. Connect end operate a recovery/recycling unit in accordance with the manufacturer's instructions.
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.
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.
Nitrogen is an inert gas. However, it also presents danger as a suffocant and,
therefore, must also be discharged in a ventilated location.