A refrigerating device comprising: - a refrigerant circuit having a compressor, a four-way selector valve, an outdoor heat exchanger, an expansion valve, a valve, and an indoor heat exchanger, a valve, and an accumulator, which are sequentially connected; characterised in that: - a discharge temperature sensor for detecting a discharge-pipe temperature (T dis) of the compressor and a suction temperature sensor for detecting a suction temperature (T suc) of the compressor; - a temperature sensor for detecting a temperature of the outdoor heat exchanger and a temperature sensor for detecting a temperature of the indoor heat exchanger; and - a control means for controlling the compressor and/or the expansion valve, wherein the compressor sucks and compresses an R32 refrigerant having a dryness of 0.65-0.85 or a pseudo-azeotropic mixed refrigerant containing R32 at at least 70 wt.-% and having a dryness of 0.65-0.85; and wherein in order for the dryness of the refrigerant to fall within a range of 0.65-0.85, the control means is configured to perform a flow of control comprising the steps of: determining whether the discharge-pipe temperature (T dis) is equal to or higher than a predetermined value; and when it is determined that the discharge-pipe temperature (T dis) is equal to or higher than the predetermined value, detecting the super heat which is the difference between the suction temperature (T suc) of the compressor obtained from the suction temperature sensor and the temperature of the outdoor or indoor heat exchanger (102 or 105) serving as the evaporator obtained from the corresponding temperature sensor (117 or 115), as well as reducing by a predetermined value by performing an operation of increasing the number of rotations of the compressor and/or an operation of opening the expansion valve, to thereby decrease the discharge-pipe temperature, determining whether the detected is within a range of 0.65-0.85, and if is within the range of 0.65-0.85, controlling the compressor and the expansion valve based on the discharge-pipe temperature (T dis) obtained from the discharge temperature sensor, or if is below the range of 0.65-0.85, increasing by decreasing the number of rotations of the compressor; the steps, and being repeated until falls within the range of 0.65-0.85. - a refrigerant circuit having a compressor, a four-way selector valve, an outdoor heat exchanger, an expansion valve, a valve, and an indoor heat exchanger, a valve, and an accumulator, which are sequentially connected; - a discharge temperature sensor for detecting a discharge-pipe temperature (T dis) of the compressor and a suction temperature sensor for detecting a suction temperature (T suc) of the compressor; - a temperature sensor for detecting a temperature of the outdoor heat exchanger and a temperature sensor for detecting a temperature of the indoor heat exchanger; and - a control means for controlling the compressor and/or the expansion valve, determining whether the discharge-pipe temperature (T dis) is equal to or higher than a predetermined value; and when it is determined that the discharge-pipe temperature (T dis) is equal to or higher than the predetermined value, detecting the super heat which is the difference between the suction temperature (T suc) of the compressor obtained from the suction temperature sensor and the temperature of the outdoor or indoor heat exchanger (102 or 105) serving as the evaporator obtained from the corresponding temperature sensor (117 or 115), as well as reducing by a predetermined value by performing an operation of increasing the number of rotations of the compressor and/or an operation of opening the expansion valve, to thereby decrease the discharge-pipe temperature, determining whether the detected is within a range of 0.65-0.85, and if is within the range of 0.65-0.85, controlling the compressor and the expansion valve based on the discharge-pipe temperature (T dis) obtained from the discharge temperature sensor, or if is below the range of 0.65-0.85, increasing by decreasing the number of rotations of the compressor;