Description
The Lennox 26W86 is an OEM dual pressure switch engineered for use in 2-stage gas furnace systems. Featuring two distinct set points — 0.9″ w.c. and 1.2″ w.c. — this switch monitors inducer and venting pressure during both low-fire and high-fire stages of operation, helping to ensure safe and efficient combustion at every firing level.
How It Works
In a 2-stage furnace, the inducer motor operates at different speeds depending on the heating demand. The dual pressure switch verifies that adequate negative pressure (draft) is present before allowing the gas valve to open at each stage. If proper pressure is not established or is lost during operation, the switch interrupts the ignition sequence to prevent unsafe conditions such as flue gas spillage or incomplete combustion.
Key Features
- Dual set points: 0.9″ w.c. (low stage) and 1.2″ w.c. (high stage)
- Designed for 2-stage furnace applications
- OEM Lennox replacement part — direct-fit accuracy
- Monitors inducer/draft pressure for safe furnace operation
- Helps prevent unsafe ignition if proper draft is not established
- Supports reliable low-fire and high-fire stage sequencing
Application
This pressure switch is a genuine Lennox OEM replacement component, ensuring compatibility and performance consistent with original factory specifications. It is intended for use in Lennox 2-stage gas furnaces where dual-pressure monitoring is required for safe and code-compliant operation.
Installation Notes
Always verify compatibility with your specific Lennox furnace model before installation. Refer to the furnace service manual for proper wiring, tubing connections, and torque specifications. Installation should be performed by a qualified HVAC technician.
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