148 Part Number STH098 06/19
REFRIGERANT PURGING PROCEDURE
1. Disconnect all electric power to the system and
lockout tag out the power source(s).
NOTE: Some systems may have more than one power
supply.
2. Work in well-ventilated, open space and eliminate all
ignition sources.
3. Install piercing valves on the high and low side access
fittings.
4. Attach manifold gauge set to the low and high side
fittings. Hoses need to be as short as practical, due to
the small refrigerant charge.
5. Purge refrigerant from both low and high side.
6. Purge the system with dry nitrogen for 3 minutes.
7. Evacuate the system with a vacuum pump
8. Purge the system again with dry nitrogen
9. Open the system by cutting the tubes with a tube
cutter. Do not use a torch to open the system.
BRAZING PROCEDURE
10. Always purge nitrogen whenever using a torch. The
nitrogen pressure regulator must be equipped with
two gauges; One gauge to measure the cylinder
pressure, and one to measure the discharge
(refrigeration system psig). The pressure regulator
must be capable of reducing the pressure to 2 or 3
psig and steadily maintaining this pressure.
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