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TM  10-4130-239-14 5-4. REFRIGERATION SYSTEM SERVICE -   PURGING (CONT) WARNINGS 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 suffocate and therefore, must also be discharged in a ventilated location. NOTE The refrigeration system must be purged with dry nitrogen, during any brazing/debrazing operation performed  on  any  component. A flow of dry nitrogen at less than 1-2 cfm (0.028-0.057 m3/minute) should be continued during all heating operations to minimize internal oxidation and scaling. After the system has been discharged using a service manifold as described  in  paragraph  5-3,  proceed  as  follows: 1. 2. 3. See specific component removal/repair instructions. Connect the high side charging hose from the service manifold to a nitrogen regulator and dry nitrogen tank. The hose from the discharge service port to the service manifold must be connected. 5-7

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