York S1-7142-3091 Auto Limit Switch 150°F Open 110°F Close

The York S1-7142-3091 Auto Limit Switch is a temperature controller that opens its contacts when the temperature is 150°F and closes them when the temperature is 110°F. This switch can prevent heat exchangers and other components in the HVAC systems of the building from experiencing thermal stress, so that the unit will shut down or limit its operation until the temperatures go back to normal performance levels. It is mounted on furnaces and air handlers to check the temperatures internally and to avoid overheating by shutting down the heating circuit when the temperatures become excessive.