and ignition control circuits

while the mechanical spring return provides a fail-safe position—either normally open or normally closed—during power loss

ensuring long-term signal integrity in high-humidity plenums or air handlers

allowing for seamless integration into various commercial electrical configurations

Ideal for hydronic and steam systems

Lochinvar & A.O. Smith 100208547 Sensor R-410A and ignition control circuitsThe Lochinvar & A. O. Smith 100208547 Sensor is a critical High Limit Outlet Sensor designed for precision temperature monitoring in high efficiency commercial and residential boilers. This genuine OEM heating system sensor provides essential boiler high limit protection by tracking outlet water temperatures and triggering an automatic safety shutdown to prevent heat exchanger damage or system failure. Built with a durable brass body and stainless