Description
The Lennox 34M76 is a factory-specified pressure switch engineered for precise, reliable performance in Lennox heating systems. Designed as a direct OEM replacement, this switch ensures your furnace operates safely by monitoring draft pressure and shutting down the system if unsafe conditions are detected.
Key Features
- Set point: .86″ water column (wc)
- Switch type: SPST (Single-Pole, Single-Throw)
- Connection: 1/4″ barb fitting for secure hose attachment
- OEM Lennox replacement part — SKU 34M76
- Designed for compatibility with Lennox furnace and air handler applications
- Monitors inducer/draft pressure to protect against unsafe operating conditions
How It Works
The pressure switch senses the negative pressure (draft) created by the inducer motor during furnace operation. If the pressure falls outside the specified .86″ wc threshold — indicating a blocked flue, failed inducer, or other fault — the SPST switch opens the control circuit, preventing ignition and protecting the heat exchanger and venting system from damage.
Application
- Direct OEM replacement for Lennox furnaces requiring the 34M76 pressure switch
- Suitable for residential and light commercial Lennox heating equipment
- Always verify compatibility with your specific Lennox model before installation
Why Choose OEM?
Using a genuine Lennox OEM pressure switch ensures exact fit, calibrated set-point accuracy, and full compatibility with your system’s control board — helping maintain warranty coverage and long-term system reliability.
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