Patent ID: 8661836
Filing Date: 2014-03-04
Classification: B60H,F25B

Abstract:
1. A method of removing contaminants from a refrigeration recovery unit comprising the steps of: connecting a first end of a high side service hose and a first end of a low side service hose to a first portion of the unit that provides a refrigerant to the service hoses; connecting a second end of the high side service hose and a second end of the low service hose to a second portion of the unit so that the second ends form a closed loop; charging the low side service hose with the refrigerant, wherein the refrigerant flows into the high side service hose; recovering refrigerant from the high side service hose while continuing to charge the low side service hose; charging the high side service hose with refrigerant while recovering refrigerant from the low side service hose; stopping the charging of the service hoses; and recovering refrigerant from the high and low side service hoses until a measured pressure reaches 0 psig.