Automatic Reset Function: The L195-20F design eliminates manual resets

Smith BTP and Cyclone series units where flange gasket replacement is required to maintain peak hydraulic efficiency and prevent oxidative corrosion at the joint

creating a dedicated potable water expansion chamber that prevents water-to-metal contact for superior corrosion resistance

and TCY series units

What is the difference between 191990A and 191990A/U

White-Rodgers 760-802 Flame Sensor Els PW 17895 Automatic Reset Function: The L195-20FThe White Rodgers 760 802 Flame Sensor is a high performance remote flame sensing solution engineered for Hot Surface Ignition (HSI) systems. Designed for reliability in demanding combustion environments, this remote flame sensor features a high grade Kanthal flame rod capable of withstanding temperatures up to 1800F. The assembly is secured with an alumina ceramic insulator to prevent electrical leakage and ensure accurate flame rectification signals