REFRIGERATION CYCLE DEVICE

摘要

A refrigeration cycle device is provided with: a main circuit 30 which is formed by connecting in a loop a compressor 1, a condenser 3, a main expansion valve 4, and an evaporator 5 and through which a refrigerant having a higher boiling point than R407C circulates; a bypass circuit 40 (discharge gas bypass circuit 6 and suction bypass circuit 8) which combines a part of a refrigerant discharged from the compressor 1 and a refrigerant flowing out of the condenser 3 and causes the combined refrigerants to flow into the suction side of the compressor 1; a negative-pressure adjustment valve (discharge gas bypass valve 7) for adjusting a flow rate in the bypass circuit 40; and a negative-pressure prevention control means 20a for controlling the negative-pressure adjustment valve 7 to perform negative-pressure prevention operation for preventing the suction pressure of the compressor 1 from becoming negative.