Description
Lennox 29W64 Two-Stage Pressure Switch
The Lennox 29W64 is an OEM replacement pressure switch engineered for two-stage Lennox heating and cooling systems. Featuring a Single Pole Single Throw (SPST), Normally Open (N.O.) configuration, this switch monitors draft pressure to verify proper inducer and venting operation before allowing ignition — a critical safety function in modern high-efficiency furnaces.
Key Features
- OEM Lennox replacement part — SKU 29W64
- Two-stage operation for compatibility with variable-capacity systems
- SPST, Normally Open (N.O.) electrical configuration
- Dual set points: .90″ W.C. and 1.30″ W.C.
- Monitors inducer/draft pressure to ensure safe ignition sequencing
- Designed to protect against blocked flue, failed inducer, and improper venting conditions
- Direct OEM fit for applicable Lennox furnace models
Application
This pressure switch is designed for use in Lennox two-stage furnaces where accurate draft pressure sensing is required at two distinct operating levels. The .90″ W.C. set point corresponds to low-stage operation, while the 1.30″ W.C. set point serves high-stage operation, ensuring the system only fires when safe venting conditions are confirmed at each stage.
Why Choose OEM?
Using a genuine Lennox OEM pressure switch ensures proper calibration, reliable switching action, and full compatibility with your system’s control board — reducing callbacks and maintaining warranty compliance.
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