The Lennox 80K26 is a precision-engineered pressure switch designed for use in Lennox furnace and HVAC systems. With a factory-set trip point of .29″ water column (wc), this switch monitors combustion air pressure to ensure safe and proper furnace operation. Its single-pole, single-throw (SPST) configuration provides a reliable open/close signal to the furnace control board, shutting down the system if adequate draft pressure is not detected — protecting both the equipment and the occupants.
Key Features
- Factory-calibrated set point of .29″ w.c. for accurate pressure sensing
- SPST (Single-Pole, Single-Throw) switching action for straightforward circuit integration
- 1/4″ barb port connection for easy hose attachment to the draft inducer or collector box
- Genuine Lennox OEM replacement part — ensures compatibility and reliable performance
- Monitors negative pressure produced by the draft inducer blower
- Protects against unsafe furnace operation due to blocked flue, failed inducer, or restricted venting
Application
The 80K26 pressure switch is a direct OEM replacement for compatible Lennox gas furnaces. It is installed in the combustion air proving circuit and works in conjunction with the draft inducer motor. When the inducer creates the correct negative pressure, the switch closes to allow the ignition sequence to proceed. If pressure falls outside the safe operating range, the switch opens to interrupt the heating cycle and prevent unsafe combustion conditions.
Specifications
- Brand: Lennox
- Part Number / SKU: 80K26
- Set Point: .29″ w.c. (water column)
- Switch Type: SPST (Single-Pole, Single-Throw)
- Port Connection: 1/4″ barb
- Type: OEM Replacement Pressure Switch
Why Choose Genuine OEM Parts?
Using genuine Lennox OEM replacement parts like the 80K26 ensures your furnace operates within manufacturer specifications. Aftermarket substitutes may not meet the precise calibration required for safe furnace operation. Trust OEM quality for lasting reliability and peace of mind.
