This SPST normally closed control is a direct drop-in replacement for the Lennox 25J3001 and is critical for maintaining safe plenum temperatures

but the unit must never be left in operation without a functional limit switch in the safety circuit

flush-mount foundation on drywall

a separate pilot orifice or assembly matching the specific BTU requirements of the furnace must be used

While universal timers exist

Lochinvar & A.O. Smith 100170461 Potentiometer Els PW 17895 This SPST normally closed controlReplacing a worn out thermostat potentiometer is a standard procedure to restore precise temperature modulation in commercial and residential heating systems. The Lochinvar & A. O. Smith 100170461 Potentiometer is a critical HVAC replacement part designed for high duty cycles, ensuring that the control board receives accurate resistance feedback for burner sequencing. This specific component is a direct OEM match, confirming that the 100170461 is