Flexotherm A421 Adjustable Thermostatic Controller

With a temperature control range of -40 to 212 °F or -40 to 100 °C, the Flexotherm A421 Adjustable Thermostatic Controller is used in a wide range of single-stage refrigeration or HVAC equipment applications including temperature monitoring and alarming, on/off control of boilers and chillers, sensor offset, temperature setback, heating and cooling control, and more.