Cross-reference your unit's model number (e

making it suitable for large-scale commercial boilers and heaters

ensuring that the unit responds correctly to thermostat staging demands

ensuring seamless integration with existing 24V control circuits and burner assemblies

this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions

Lochinvar & A.O. Smith 100289391 Pressure Switch 30067439-890 Cross-reference your unit's model numberThe Lochinvar & A. O. Smith 100289391 Pressure Switch is a critical safety component engineered for high efficiency condensing water heaters and commercial boilers. Calibrated to a 0. 55" WC (Water Column) set point, this direct replacement for 100294588 monitors the induced draft blower to ensure proper venting of combustion gases. In the field, this switch is the primary defense against blocked flue conditions and inducer motor failure, preventing