To rapidly finish an ice making cycle by opening a second solenoid valve connected to a bypass pipe when the detected temperature of an outside air temperature sensor reaches a set temperature or higher during an ice making operation.

An ambient temperature in which a remote condenser 29 is provided is detected by an outside air temperature sensor 20. When the detected temperature reaches a set temperature or higher, the second solenoid valve 19 of a bypass pipe 18 is opened and a liquefied refrigerant is fed to the low pressure side of a compressor 15 so that the compressor 15 is cooled. Further, when the detected temperature is lower than the set temperature, the second solenoid valve 19 is closed and the feed of the liquefied refrigerant is stopped. Then, when a first ice making timer counts a prescribed number of times, an ice making operation is finished to move to an ice removing operation. When the ice removing operation is started, the first solenoid valve 17 of a hot gas pipe 16 is opened to feed hot gas to a cooler 1 and a driving device is operated so that an ice tray is opened and square ices in the cooler 1 are removed.