Lochinvar & A.O. Smith 100074348 PCB 318518-761 this is a mechanical repair

this is a mechanical repair kit for the pressure vessel components

Durable Brass Construction: Engineered to withstand mechanical vibrations and temperature cycles common in commercial rack systems

Can I use this to replace a different brand of 50A contactor

The compact 9-inch steel housing is designed to withstand extreme operating temperatures while effectively trapping copper shavings and system debris

Manual override lever: Allows for manual opening during system filling or maintenance (NC models only)

Lochinvar & A.O. Smith 100074348 PCB 318518-761 this is a mechanical repairThe 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