... to set.Display4 nixie tube LED and 6 pcs of lights.Detect4 channels of temperature (inlet temperature, ambient temperature, dew point, ... low pressure.NC or NO can be set.Alarm outputDisplay 3 alarm codes, contains over temperature alarm, high pressure alarm, ... signal, and need press ‘Rest’ button to release.Output3 channels of output, compressor, drain valve and condenser motor fan.Compressor start ...