this model is specific to 24V on/off (two-position) applications

Rugged Construction: Durable cast iron valve body and die-cast aluminum spring case offer robust protection against environmental demands

including cross-references to White-Rodgers 36J24618

It will not open if the inlet and outlet pressures are equalized or if the system pressure is below this threshold

and A99 temperature sensors

Lochinvar & A.O. Smith 100109944 Ignition Board R-22 this model is specific toThe Lochinvar & A. O. Smith 100109944 Ignition Board is a critical OEM replacement part engineered for high performance commercial gas water heaters. Designed for precision ignition control, this integrated circuit manages the HSI (Hot Surface Ignition) sequence, ensuring consistent flame sensing and gas valve timing for specific BTN and BTR 500 series units. As a verified factory replacement board, it eliminates the timing issues and terminal