b. PURGING PROCEDURE.
1. Open both service valves on the unit.
Open nitrogen cylinder valve and allow dry nitrogen to flow through the system
until brazing/debrazing operation is complete or moisture is removed from the system.
A minimum of 5 minutes of nitrogen purge is required for moisture
Close nitrogen cylinder valve.
Close both unit service valves.
Loosen service hoses to drain pressure in hoses.
Disconnect hoses and reinstall service valve caps.