Lennox 11U66 Pressure Switch 320074-702 This enclosed motor design features

This enclosed motor design features sealed ball bearings and is thermally protected to handle the high-ambient loads typical of York

For contractors servicing residential and light commercial air handlers

this OEM-spec O-ring ensures dimensional accuracy and thermal stability

the unit features an integrated combustion blower motor and housing designed to meet strict UL safety standards

Key Benefits for Technicians Broad Compatibility: Optimized for use with multiple high-pressure refrigerants including R407C and R404A

Lennox 11U66 Pressure Switch 320074-702 This enclosed motor design featuresThe Lennox 11U66 Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency gas furnaces and HVAC systems. As a genuine OEM replacement, this 0. 55" WC pressure switch is factory calibrated to actuate at 0. 55 inches of water column, ensuring the inducer motor is creating sufficient static pressure before the ignition sequence begins. Built by Cleveland Controls (MPN: 11U66 or 104371 03), this single pole