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Safety Logic: The SPST configuration ensures the burner cannot fire if flue gas venting is obstructed
Common Technician Questions: How do I know if the drain spud needs replacement
Versatility: Simplifies field modifications and retrofits where the original shaft is insufficient for standard mounting
eliminating reliance on standing pilot lights
Lennox 74N47 HSI Ignitor Els PW 17895 Safety Logic: The SPST configurationThe Lennox 74N47 HSI Ignitor is a high performance, OEM grade hot surface ignitor specifically engineered for precision ignition in Lennox gas furnaces and condensing water boilers, including GWB9 series models. As a veteran technician knows, maintaining reliable combustion starts with a fast acting 120V element. This silicon carbide ignitor provides the necessary thermal mass to reach ignition temperatures rapidly, ensuring the gas valve opens to a
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