This SPNO relay is a versatile industry standard for modernizing older air handlers or replacing failed fan center components

Whether you are servicing industrial instrumentation or local air service lines

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

allowing technicians to push

Reznor 85449 Limit Switch This SPNO relay is aThe 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,