Lennox 18G90 Pilot Assembly Els PW 17895 large exhaust fans can also

large exhaust fans can also create negative pressure that pulls flue gases out of the draft hood and onto the vent safety switch

this relay is the standard interface for 120V EACs

blocked secondary heat exchanger

the 4520-0011-000 is normally closed and should only open when reaching the 300°F set point

Lennox 18G90 Pilot Assembly Els PW 17895 large exhaust fans can alsoThe Lennox 18G90 Pilot Assembly is a high performance OEM replacement engineered for precise ignition control in natural gas furnace systems. Designed for demanding residential and commercial HVAC applications, this pilot burner with electrode features a factory calibrated 0. 018 inch orifice to ensure a stable and consistent flame pattern for efficient combustion. This assembly is a critical component for technicians addressing ignition failure or