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Return Refrigerant to Normal Operating Conditions
1.
Be sure that the vessel that was opened has been evacuated.
2.
Access the Control Test Terminate Lockout table to view vessel pressures and turn on
machine water pumps.
3.
Open valves 1a, 1b, and 3.
4.
Crack open valve 5, gradually increasing pressure in the evacuated vessel to 68 psig
(469 kPa), for HCFC-22, 35 psig (141 kPa) for HFC-134a. Feed refrigerant slowly to
prevent tube freeze up.
5.
Leak test to ensure vessel integrity.
6.
Open valve 5 fully.
7.
Open valve 11 to equalize the liquid refrigerant level between vessels.
Valve
1a 1b 2 3 4 5 8 11 12 13 14
Condition
C CCCCC C C
Valve
1a 1b 2 3 4 5 8 11 12 13 14
Condition
CCCCCCC