Our Firestat switches come in both adjustable and fixed temperature models. However, you may not know what temperature you need in the first place.
The temperature you’ll need your Firestat to be set at depends on how close you place it to your furnace and how hot your furnace runs. Our lowest fixed temperature switch is set at 125°F, but the air right next to your furnace might be warmer than that. We recommend that you identify where you plan on installing your duct limit switch before you buy it and measure the air temperature when your furnace is running. Once you know that temperature, add about 40°F and that’s what you should set your switch at. That gives you plenty of leeway for temperature to fluctuate without shutting your system down while still making sure that things don’t get too hot.
The Duct High Temperature Switches feature a helix bimetal element that senses rapid increases in duct temperature, such as those caused by fire. The high temperature limit then operates an SPST switch that opens with a rise in temperature. A manual reset button reactivates the temperature limit after the high-temperature condition has cleared. These duct high temperature limits are indispensable in specialized HVAC applications and Building Automation Systems.
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