Answer :
Technicians must recover refrigerant from a low-pressure appliance until it reaches an evacuation level of 0 psig (pounds per square inch gauge) or absolute pressure equivalent to atmospheric pressure.
Refrigerant recovery is a critical step in the disposal or decommissioning of appliances that contain refrigerants. The purpose of recovery is to remove the refrigerant from the system in a safe and environmentally responsible manner, preventing its release into the atmosphere. For low-pressure appliances, such as those operating with refrigerants like R-11 or R-123, the evacuation level must be brought down to 0 psig.
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