Refrigeration – Automatic control – Withdrawing or adding refrigerant from or to normally closed...
Patent
1987-11-04
1988-09-06
Tapolcai, William E.
Refrigeration
Automatic control
Withdrawing or adding refrigerant from or to normally closed...
62292, 1374875, 141 83, 222 66, F25B 4500
Patent
active
047683473
ABSTRACT:
A refrigerant recovery system which includes a compressor having an input coupled through an evaporator and through a solenoid valve to the refrigeration system from which refrigerant is to be withdrawn, and an output coupled through a condenser to a refrigerant storage container. The evaporator and condenser are contained within a closed cylindrical canister for heat exchange and oil separation, the canister having an oil drain valve in the bottom. The refrigerant storage container is carried by a scale having a limit switch coupled to control electronics to prevent or terminate further refrigerant recovery when the container is full. The entire system, including the control electronics, is mounted on a two-wheel hand truck to facilitate transport to a job site such as a building air conditioning or heat pump system. Apparatus for purifying recovered refrigerant includes a replaceable core filter/dryer, and a liquid pump for circulating refrigerant from the liquid port of the storage container through the core and then to the container vapor port. A differential pressure gauge is connected across the filter/dryer to indicate need for core replacement. A moisture indicator displays water concentration in the refrigerant. The purification apparatus may be either separate from or combined with the recovery system.
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Manz Kenneth W.
Shirley Roger D.
Kent-Moore Corporation
Tapolcai William E.
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