Lochinvar & A.O. Smith 100074348 PCB 320735-701 offering versatility for both hydronic

offering versatility for both hydronic and steam heating applications

Reliable Pneumodular Design: Compact footprint with five barbed connections for standard 1/4 inch O

Always cross-reference the assembly number on your existing module before ordering

If you see melted plastic or heavy oxidation on the silver points

The quiet redundant magnetic operator provides reliable flow control

Lochinvar & A.O. Smith 100074348 PCB 320735-701 offering versatility for both hydronicThe Lochinvar & A. O. Smith 100074348 PCB is a critical OEM replacement control board designed for high efficiency tankless water heaters and select boiler models. Specifically engineered for 66J IN and 66J OS series units, this printed circuit board acts as the central intelligence for the system, regulating the ignition sequence, monitoring flame rectification, and processing data from integrated safety sensors. To ensure peak energy efficiency and