CHILLER DEVICE

In a chiller apparatus that performs temperature control operation stably without placing an excessive load on an electric compressor 102 even when the temperature difference between a set temperature and a work temperature is small and there is little temperature difference between the refrigerant intake side and the refrigerant discharge side of an evaporator 101 in a freezing cycle 100, at a time of temperature control setting with a small temperature difference between the set temperature and the work temperature, a circuit board (PCB2) 106 performs a PID operation on a refrigerant detection temperature detected by a temperature sensor T2 on the near side of refrigerant inflow of a heating apparatus 202 in a refrigerant cycle 200; a circuit board (PCB1) 105 performs serial communication of a drive control signal for an inverter 107 generated based on a result thereof, and controls the rotational speed of the compressor 102 according to the work temperature within a certain range. Additionally, the circuit board 106 performs a PID operation on the work temperature detected by a first temperature sensor T1, and the circuit board 105 controls opening and closing of a first electronic expansion valve EV1 by driving a stepping motor SM1 according to a pulse signal generated based on a result thereof, and controls the flow rate of a refrigerant.