Method and apparatus for refrigerant purification

摘要

Refrigerant is purified by circulating the refrigerant in a closed path from a first refrigerant container through a filter/dryer unit back to the first refrigerant container. Air and other non-condensibles are purged from the refrigerant in the first storage container during this refrigerant circulation process. Following the non-condensible purging operation, the refrigerant in the first container is transferred through a filter/dryer unit into a second refrigerant container. This second refrigerant container is evacuated prior to transferring the purified refrigerant thereto. Capacity of the filter/dryer unit is monitored, either by monitoring time of operation of the refrigerant pump or monitoring wetness of the circulated refrigerant with the sight gauge.