and air/vapors

This ensures any bubbles seen represent actual flash gas at the valve inlet

this specific model is a CCW rotation (Counter-Clockwise) unit as viewed from the lead end/opposite shaft end

making it an essential part of the HVAC control system

The 918759 serves as a direct

Lochinvar & A.O. Smith 100208478 Board 320735-701 and air/vaporsThe Lochinvar & A. O. Smith 100208478 Board is a critical OEM replacement control board engineered for high performance commercial and residential hydronic systems. As a veteran grade HVACR ignition control, this integrated furnace control (IFC) manages essential sequence operations including hot surface ignition (HSI), flame rectification, and blower timing. Designed for seamless integration with Lochinvar Knight and A. O. Smith water heater models,