Description
The Lennox 80K28 is a factory-engineered replacement pressure switch designed to deliver precise, dependable draft-pressure monitoring in Lennox furnace and air handler applications. With a calibrated set point of 0.43″ water column (wc) and a single-pole, single-throw (SPST) switching configuration, this switch accurately senses inducer and venting pressure to confirm safe combustion airflow before allowing ignition to proceed — protecting both equipment and occupants from unsafe operating conditions.
Key Features
- Set Point: 0.43″ water column (wc)
- Switch Type: SPST (Single-Pole, Single-Throw)
- Port Connection: 1/4″ barb fitting for secure hose attachment
- OEM Lennox replacement part — engineered to original specifications
- Monitors inducer/draft pressure to verify proper venting before ignition
- Helps prevent unsafe furnace operation due to blocked or restricted flue conditions
- Direct drop-in replacement for compatible Lennox furnace models
How It Works
The pressure switch is a critical safety component in gas furnaces. It is connected via a rubber hose to the inducer motor housing or collector box. When the inducer motor runs and creates the correct negative pressure (at or beyond the 0.43″ wc set point), the SPST switch closes, signaling the control board that venting is confirmed and allowing the ignition sequence to continue. If adequate pressure is not sensed — due to a blocked flue, failed inducer, or cracked hose — the switch remains open and locks out ignition, preventing hazardous operation.
Application
- Designed as a direct OEM replacement for select Lennox gas furnaces
- Compatible with systems requiring a 0.43″ wc SPST pressure switch with 1/4″ barb port
- Ideal for HVAC technicians performing routine maintenance, diagnostics, or component replacement
Why Choose the Lennox 80K28?
Using a genuine Lennox OEM pressure switch ensures the correct set point calibration, proper fit, and reliable performance. Aftermarket substitutes may not meet the precise pressure thresholds required by your furnace’s control board, potentially leading to nuisance lockouts or, worse, unsafe ignition attempts. The 80K28 is built to Lennox’s exacting standards for long-term durability and accurate switching.
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