Description
The Lennox 65W49 is an OEM-grade pressure switch engineered for reliable furnace protection and system safety. Designed as a direct replacement for compatible Lennox heating systems, this switch monitors negative pressure generated by the inducer assembly and interrupts system operation if pressure falls outside the safe operating range — preventing unsafe combustion conditions and protecting heat exchanger integrity.
Key Features
- Set point: -0.60″ w.c. (water column) for precise negative pressure sensing
- SPST (Single-Pole, Single-Throw) switching action for straightforward normally-open circuit control
- 1/4″ barb port connection for secure, leak-free tubing attachment
- OEM Lennox replacement part — engineered to factory specifications
- Monitors inducer draft pressure to confirm safe furnace operation before allowing ignition
- Helps prevent nuisance lockouts while protecting against flue blockage and inducer failure
Application
The 65W49 pressure switch is a direct OEM replacement part for select Lennox gas furnace models. It is installed in the furnace control circuit and wired in series with the control board, opening the circuit if adequate negative pressure is not established by the draft inducer motor. This safeguard ensures combustion gases are properly vented before the burners are allowed to fire.
Specifications
- Brand: Lennox
- Part Number / SKU: 65W49
- Switch Type: SPST (Single-Pole, Single-Throw)
- Set Point: -0.60″ w.c.
- Port Connection: 1/4″ barb
- Application: Gas furnace draft/pressure sensing
Why Choose the Lennox 65W49?
Using genuine OEM or OEM-equivalent pressure switches ensures your Lennox furnace operates within manufacturer-specified safety parameters. The 65W49 delivers consistent, repeatable switching at its rated set point, reducing callbacks and ensuring long-term system reliability. Its 1/4″ barb fitting accepts standard silicone or rubber sensing tubing for a straightforward installation.
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