Johnson Controls A19AAB-4 Remote Bulb Temperature Control 30°F/110°F,Open-High, 6" Capillary ,3.5F Differential

The Johnson Controls A19AAB-4 Remote Bulb Temperature Control is a single-stage device that is used to set a particular temperature in the heating or cooling systems. It employs a remote sensor with a 6 feet long capillary tube which is connected to a control unit. It is a temperature sensor located in the controlled environment to monitor changes in temperature. This information goes to the control unit and depending on whether it is high or low, the unit switches on or off your HVAC equipment (furnace, air conditioner) to regulate the temperature range of between 30°F and 110°F.