Lochinvar & A.O. Smith 100167835 Control 320734-701 Always verify the relief valve

Always verify the relief valve flange size before installation

Optimized Defrost Logic: Provides accurate sensor feedback to the control board

Industrial Durability: Built to withstand the constant vibration and moisture levels found in chiller and AHU environments

Integrated Barbed Fitting: Facilitates accurate pressure monitoring and air-fuel ratio maintenance for safety compliance

Its compact footprint and NEMA 2 (IP54) housing make it ideal for light commercial applications where space is limited and long-term positioning accuracy is required

Lochinvar & A.O. Smith 100167835 Control 320734-701 Always verify the relief valveThe Lochinvar & A. O. Smith 100167835 Control is a critical integrated control board engineered specifically for the Knight WH199 wall mount boiler series. Designed for peak hydronic heating performance, it serves as the central intelligence for your appliance, managing the firing rate, combustion fan speed, and multi zone pump logic. This OEM replacement part replaces previous iterations with improved firmware to handle sophisticated modulating