These firestat HVAC limit switches are installed in air ducts to shut down heating, air conditioning and ventilation equipment when air temperature exceeds a pre-set limit.
The firestat HVAC limit switch features a helix bimetal element that senses rapid increases in duct temperature, such as those caused by fire. The limit switch operates an SPST switch that opens with a rise in temperature. A manual reset button reactivates the limit switch after the high-temperature condition has cleared. These HVAC limits are indispensable in specialized HVAC applications and Building Automation Systems.
For more information about the firestat HVAC limit switches, view the product page below.