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Ships within 48 hours · Estimated delivery Sep 12 - Sep 17
Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
For technicians performing burner repair or preventative maintenance
helping contractors distinguish between mechanical failure and electrical coil issues
For technicians troubleshooting hydronic mixing control issues
Is the 150# rating adjustable
Lennox 59W40 Proving Switch 321702-401 For technicians performing burner repairThe 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
US$ 39.95
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US$ 39.95