Lennox 80K28 Pressure Switch

The Lennox 80K28 is a critical safety component designed for precise furnace pressure monitoring in high-efficiency gas-fired systems. This OEM Lennox replacement part, also identified as 80K2801, features a factory-calibrated set point of .43" WC (Water Column) to ensure the inducer motor is generating sufficient draft before allowing ignition. Built for durability in demanding HVAC ventilation systems, the switch utilizes a Single Pole Single Throw (SPST) configuration, typically operating in a normally open state and closing once the negative pressure threshold is reached.

For technicians assisting with field repairs, the 80K28 includes a standard 1/4" barb connection for secure integration with existing pressure tubing. This Honeywell IS20321-5546 cross-referenced component is engineered to prevent hazardous combustion conditions by interlocking the burners with the exhaust system. This switch is commonly found in Lennox, Armstrong, and Ducane equipment where accurate 0.43" WC pressure switch tolerances are vital for maintaining system performance and preventing E228 calibration error codes.

• Precise 0.43" WC Triggering: Features a tight tolerance range of +/- .05" to ensure safety protocols are met without nuisance tripping.
• Universal Compatibility: Direct Lennox 80K2801 replacement, ensuring the same physical mounting and electrical specs as the original factory unit.
• Industrial-Grade Build: Constructed with robust materials to withstand high-temperature environments ranging from -40°F to 150°F.
• Simple Integration: Standard 1/4 inch barb connection and SPST terminals allow for a fast swap-out during service calls.

• Is the Lennox 80K28 and 80K2801 the same part? Yes, the 80K28 is technically identical to 80K2801 and serves as the direct OEM replacement pressure switch for several Lennox-family brands.
• How do I troubleshoot a pressure switch open error? First, check for blockages in the inducer motor assembly, venting, or the pressure tubing. If the inducer is pulling a vacuum greater than .43" WC but the switch is not closing, the internal diaphragm or contacts may have failed.
• Can I use a different pressure rating in a pinch? No. HVAC safety switches must match the manufacturer's specified set point (in this case, .43" WC) to ensure the system exhausts flue gases safely.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.