Lochinvar & A.O. Smith 100289391 Pressure Switch 320720-756 allowing for discharge air monitoring

allowing for discharge air monitoring and optimal start recovery based on ambient conditions

and saturated steam up to 38 psig

ensuring exact bolt-pattern alignment and harness compatibility

or an aging blower motor that is failing to move enough CFM across the heat exchanger

The kit includes a high-grade Nichrome resistance coil designed for durability and consistent thermal output

Lochinvar & A.O. Smith 100289391 Pressure Switch 320720-756 allowing for discharge air monitoringThe 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