Description
The Lennox 59W40 is a factory-authorized OEM blower proving switch designed to verify adequate airflow from the blower before allowing the furnace to proceed through its heating cycle. With a setpoint of -0.15″ W.C., this pressure switch acts as a critical safety interlock — if the blower fails to generate sufficient airflow, the switch remains open and prevents the system from firing, protecting both equipment and occupants.
Key Features
- OEM Lennox replacement part for precise fit and reliable performance
- -0.15″ W.C. setpoint for accurate blower airflow verification
- Acts as a safety interlock to prevent furnace operation without confirmed blower airflow
- Direct drop-in replacement helps minimize downtime and simplifies installation
- Engineered to Lennox quality standards for long service life
Application
This blower proving switch is intended for use in compatible Lennox furnace systems. It monitors the negative pressure created by the blower motor and confirms that airflow is present before the control board advances the heating sequence. Proper blower proving is essential for safe furnace operation and compliance with equipment safety protocols.
Why Choose the Lennox 59W40?
Using a genuine Lennox OEM component ensures compatibility with your existing system and eliminates the guesswork of aftermarket substitutions. The 59W40 is the correct replacement for technicians seeking a reliable, code-compliant repair on applicable Lennox furnace models.
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