PURPOSE: To enable consecutive execution of operations of recovering refining and filling a refrigerant by a construction wherein the refrigerant flowing into a separator by making a refrigerant apparatus on the refrigerant delivery side communicate with the separator is separated into a liquid and a gas and the liquid is stored in the separator, while the gas is sent to a compressor through a gas-sending conduit connected to the separator.

CONSTITUTION: One end of a delivery conduit 1 the other end of which is connected to a refrigerant apparatus B1 on the refrigerant delivery side is connected to a separator D and one end of a gas-sending conduit 2 the other end of which is connected to this separator D is connected to a compressor C. A three-way valve 3WV and a condenser K are interposed in the middle of a compression conduit 3 one end of which is connected to the compressor C, and the other end of this conduit is connected to a liquid receiver R wherein the separator D is provided. The fore end of a filling conduit 6 connected to the liquid receiver R is connected to a cylinder B, on the filling side, while an expansion valve EV7 is interposed in the middle of a reflux pipe 7 which branches from this conduit at the middle thereof and is connected to the liquid receiver R. According to this constitution, operations of collection, refining and filling can be executed consecutively, while the recovery, refining and filling can be conducted discretely by closing the valve.