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Safety Monitoring: Prevents the accumulation of combustion gases by detecting blocked flue or inlet conditions
allowing technicians to monitor accurate downstream pressure directly at the regulator during commissioning
Engineering a reliable seal for hot and chilled water applications
corroded units
Lennox 59W40 Proving Switch THPU32HP7Y Safety Monitoring: Prevents the accumulationThe 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
