One of our customers down south (I mean we are in Wisconsin so really anything to us is down south) had a shed/workshop that he wanted to cool down without using an air conditioning unit. He wanted to put an exhaust fan on a thermostat so even if he was not in the building the fan would go on keeping his enclosed shed from overheating. A fire fighter friend of his let him know if you have a fire in that building that it is just going to feed the flames and the building will go up into smokes pretty quickly.
They decided to place a high limit TC switch in the attic of the building to sense a high temperature over 200°F.This fan will cool the building if it goes above 80°F and if there is excessive heat sensed assuming a fire or smoke it would shut the blower off. Here we have a simple device with a simple real-life application.
Adjustable Temperature Limit Switch
The adjustable temperature duct limit switch features a helix bi-metal element that senses rapid increases in temperature, such increases often caused by fire in a HVAC duct system. The duct limit switch operates a single pole, single throw (SPST) switch that opens when temperature rises. The adjustable duct limit switch can be set by the operator to sense 100°F to 250°F. The enclosure has an ambient temperature of -40°F to 190°F. And the element’s ambient temperature is 350°F.
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