The XR77CX model has an external dimension of 32x74mm and is a digital thermostat for low temperature ventilation refrigeration units. system Digital thermostat designed for cold service with stop defrost cycle. It has four relay outputs to control the compressor, Evaporator fan, defrost (electric or reverse cycle hot gas) and lighting (configurable). It also provides a real The time clock RTC can set up to 6 defrost cycles a day, divided into working days and holidays. There are two settings Point the "day and night" function to use with energy saving operation. It also provides up to 3 NTC or PT1000 probes Head input, the first is used for temperature control, the second is placed in the evaporator to control the defrost termination temperature and manage Evaporator fan, the third is used to give a condensing temperature alarm signal or display a temperature. Digital inputs can be used as Fourth probe. The HOT KEY output of the programming key can be connected to the device through the external module XJ485-CX, and then connected to a ModBUSRTU compatible network, such as the X-WEB series of Dixell monitoring units. It can also be quickly programmed by HOT KEY Quick and easy editing controller. The controller can all be edited through specific parameters, and can be easily edited through the keyboard.