this is an automatic reset snap disc

If the inducer assembly is not reaching 3000 RPM or if the blower wheel is obstructed

one side of the hub is broached for hex shafts while the other remains round

reducing callbacks due to carbon fouling or ceramic cracking

featuring a regulator spring

Resideo TH114-A-120S Thermostat 320074-702 this is an automatic resetThe Resideo TH114 A 120S is a high performance non programmable line voltage thermostat engineered for precise control of 120V electric heating systems. Designed for heavy duty applications, this unit features SPST switching and a 15 amp resistive load capacity, making it an ideal solution for baseboard heaters, convector units, and fan forced heaters. Utilizing advanced TRIAC switching technology, the TH114 A 120S eliminates the clicking noise