Lochinvar & A.O. Smith 100074451 PCB 322057-301 providing a high-integrity seal between

providing a high-integrity seal between the blower assembly and the gas-air mixing components

This single-pole single-throw (SPST) switch is factory-calibrated to a -1

Simple in-line installation within the water supply assembly

Consult the specific temperature and pressure ratings for your media to ensure compatibility with the forged brass and stainless steel components

Lochinvar & A.O. Smith 100074451 PCB 322057-301 providing a high-integrity seal betweenThe Lochinvar & A. O. Smith 100074451 PCB is a critical integrated control module designed for high efficiency commercial and residential water heaters and boilers. Known as the MC50 PCB, this genuine OEM component manages vital system operations including ignition sequences, temperature regulation, and safety circuit monitoring. Engineered for a precise fit in Lochinvar Knight and various A. O. Smith tankless models, it ensures absolute signal