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this assembly includes the necessary baseplate to simplify installation for technicians
and VG9000 series globe valves
it meets UL555 and UL555S requirements for smoke control
ensuring continuous drainage without steam loss
while the second switch is utilized to energize the boiler feed pump or a motorized feed valve as water levels fluctuate
Lochinvar & A.O. Smith 100074451 PCB 321894-708 this assembly includes the necessaryThe 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
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