Lennox 11J09 Pressure Switch 320734-701 and FSH3BF4M2SX24K series

and FSH3BF4M2SX24K series

The visible scale allows for immediate confirmation of the differential pressure at which the SPDT contacts will reposition

Industrial Build: Features a snap-acting contact structure with high contact force to eliminate bounce and ensure long-term electrical reliability

Its 95-degree rotation and manual override capability allow for easy commissioning and mechanical adjustment during system maintenance or power loss scenarios

it provides a critical thermal and pressure safety margin

Lennox 11J09 Pressure Switch 320734-701 and FSH3BF4M2SX24K seriesThe Lennox 11J09 Pressure Switch is a high precision, single stage OEM combustion air pressure switch designed for specific Lennox and Armstrong furnace applications. Technicians know that maintaining exact pressure differentials is critical for safe system sequencing; this component is factory calibrated to actuate at 0. 60" W. C. (Water Column). This S1 11J09 induction fan pressure switch replaces legacy part numbers 11U65 and 104106 03, ensuring