Lennox 59W40 Proving Switch THPU32HP7Y and Frigidaire furnaces and air

and Frigidaire furnaces and air handlers

allowing technicians to monitor accurate downstream pressure directly at the regulator during commissioning

Common Questions Does this kit work with the smaller 1/2" VG7000 valves

Engineering a reliable seal for hot and chilled water applications

Lennox 59W40 Proving Switch THPU32HP7Y and Frigidaire furnaces and airThe Lennox 59W40 Blower Proving Switch is a critical safety component designed for specific Lennox furnace models and air handling units. This negative pressure switch is calibrated to a precise . 15" WC setpoint, ensuring the inducer motor or blower assembly is generating sufficient draft before allowing the ignition sequence to proceed. As a genuine Lennox replacement part, the 59W40 ensures seamless integration with the existing control board