All controllers of XR100 series can be connected to XJ500 remote controller through two terminals of RS485 interface process monitoring system. The dimensions of XR160C and XR170C are 32×74mm, which are used for medium and low temperature refrigeration systems. The controller adopts three-way relay output to control the compressor, defrosting (electric defrosting or thermal defrosting) gas defrost) and evaporator fan. The main feature of the XR170C is that additional relays can be used to report alarm or auxiliary output. Two NTC or PTC sensor inputs, one for temperature control, the other One is used to control the defrosting end temperature of the evaporator, two digital inputs (passive contact point) can set its function through parameters, built-in buzzer alarm. can be pressed via the control panel Keys to set parameters, easy to achieve various functions.