Lennox 80W51 Pressure Switch Overview
The Lennox 80W51 is an OEM replacement pressure switch designed for use in Lennox furnace and heating systems. Set at .55″ w.c. (water column), this switch monitors the negative pressure generated by the inducer motor to confirm proper venting conditions before allowing ignition to proceed — a critical safety function in modern gas furnaces.
Key Features
- OEM Lennox replacement pressure switch — SKU 80W51
- Set point: .55″ w.c. (water column)
- Monitors inducer draft pressure to ensure safe furnace operation
- Prevents ignition if proper venting pressure is not established
- Designed for direct OEM fit in compatible Lennox furnace models
- Helps maintain system safety and efficiency
Application
This pressure switch is a safety device used in Lennox gas furnaces. It verifies that the draft inducer is operating correctly and that flue gases are being properly exhausted before the ignition sequence is allowed to begin. Replacing a faulty pressure switch with the correct OEM part ensures reliable performance and compliance with the original equipment specifications.
Why Choose an OEM Replacement?
Using a genuine Lennox OEM pressure switch guarantees compatibility, correct set-point calibration, and long-term reliability — protecting both the equipment and the end user. Always verify compatibility with your specific Lennox furnace model before installation.
