| 摘要 |
Disposed is a contaminant recovery receptacle ( 40 ) which is connected, through an inflow pipe ( 42 ) and an outflow pipe ( 43 ), to the suction side of a compressor ( 21 ). The inflow pipe ( 42 ) has an exit end which opens towards the inner bottom of the recovery receptacle ( 40 ). The outflow pipe ( 43 ) has an entrance end which is situated above the exit end of the inflow pipe ( 42 ) in the recovery receptacle ( 40 ). Firstly, a preliminary operation is carried out which causes refrigerant to circulate in a refrigerant circuit ( 10 ) for a predetermined length of time so that gas-liquid two-phase refrigerant flows into the recovery receptacle ( 40 ). Thereafter, a recovery operation is carried out, which causes refrigerant to circulate in the refrigerant circuit ( 10 ) so that gas refrigerant flows into the recovery receptacle ( 40 ). As a result, contaminants are recovered in the recovery receptacle ( 40 ).
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