Chiller device

A chiller device having a function to stably carry out a temperature-retention operation without overloading an electric compressor (102) even when the temperature difference between a set temperature and the operating temperature is small and there is almost no temperature difference between the refrigerant intake side and the refrigerant discharge side of an evaporator (101) in a refrigeration cycle (100). In said chiller device, a circuit board (PCB2) (106) carries out a PID computation with regard to a refrigerant detection temperature, which is detected by means of a temperature sensor (T2) on the front side of a refrigerant inflow of a heating device (202) in a refrigeration cycle (200), when a temperature-retention setting in which the temperature difference between a set temperature and the operating temperature is small is being set; and a circuit board (PCB1) (105) uses serial communication to send a drive control signal, which was generated on the basis of the PID computation results, to an inverter (107), thereby controlling the rotational speed of the compressor (102) within a predetermined range in accordance with the operating temperature. Additionally, a circuit board (106) carries out PID computation with regard to the operating temperature detected by means of a temperature sensor (T1), and a circuit board (105) drives a stepping motor (SM1) by means of a pulse signal, which was generated on the basis of the aforementioned PID computation results, to control the opening and closing of an electronic control valve (EV1), thereby controlling the refrigerant flow rate.