always verify your model and serial number to ensure exact fitment for the collector box assembly

Whether you are servicing industrial instrumentation or local air service lines

allowing technicians to push

reducing nuisance service calls

calibrated to open at 170°F and close at 140°F

Reznor 85449 Limit Switch always verify your model andThe Reznor 85449 is a critical safety component designed for precise thermal regulation in commercial gas fired unit heaters and furnaces. This 140 200F Auto Limit Switch monitors internal air temperatures, functioning as a primary high limit safety by interrupting the burner circuit if the heat exchanger surpasses the 200F threshold. As an OEM replacement part, it ensures seamless compatibility with Reznor UDAP, UDAS, and UDX series heaters,