Quick and easy to install Copy Card per the quick parameters programming The ID 974 is a microprocessor-based refrigeration controller designed for the control of ventilated refrigeration units for low or normal temperatures. Technical Front panel: IP65 Dimensions of front panel: 74x32mm Use temperature: -5...55°C Storage temperature: -30...85°C The ID 974 controller has 2 inputs for temperature sensor type PTC (NTC software setting) and 3 output relays for compressor, defrost and evaporator fans control. The defrosting cycles are controlled by stopping the compressor for a set time or by using the temperature sensor on the evaporator. The temperature sensor value is displayed using three digits and the minus sign. The decimal point display can be selected with a parameter. Audible temperature alarms are available as standard.