Lochinvar & A.O. Smith 100074451 PCB 321894-708 The triangular bracket configuration is

The triangular bracket configuration is designed for mounting surfaces where the shaft is perpendicular to the frame

it meets UL555 and UL555S requirements for smoke control

most veteran techs recommend replacement if the ceramic is compromised or the metal is severely pitted to ensure consistent conductivity

While it is primarily for International Comfort Products

and VG9000 series globe valves

Lochinvar & A.O. Smith 100074451 PCB 321894-708 The triangular bracket configuration isThe 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