this SPST (Single Pole Single Throw) switch provides indispensable protection by detecting dangerous flame rollout or excessive heat buildup near the burner assembly

and furnaces alike

ensuring the unit returns to peak BTU efficiency without the need for field modifications or generic bracket adjustments

and ZB models

the 1862 US Motors model is specifically identified as the technical HC39VA231 replacement

Sporlan 952664 TCB 320788-702 this SPST (Single Pole SingleThe Sporlan 952664 TCB is a high performance Temperature Control Board engineered for precision management of electronic expansion valves (EEVs) and suction control valves in commercial HVACR systems. Built for heavy duty field use, this board is fully compatible with Sporlan SEI, SEH, CDS, and SDR series valves. Featuring an integrated potentiometer, this model allows for immediate, on site adjustments to the temperature setpoint without requiring