The Lennox 40W05 (OEM 101599-05) 2-Stage Pressure Switch is a direct replacement pressure control switch designed for reliable performance in residential and light commercial heating systems. Engineered for precise air pressure monitoring, this pressure switch ensures proper combustion and system efficiency by accurately detecting vent and inducer pressures.

This pressure switch features a dual set-point design with a high set point of 1.02" W.C. and a low set point of 0.25" W.C., making it compatible with multi-stage furnaces that require two separate pressure thresholds. The robust construction delivers consistent operation and long service life, helping maintain safe airflow and optimal blower and inducer motor performance.

This switch is ideal for Lennox systems that specify the 40W05 or 101599-05 pressure switch and is commonly used in furnace pressure monitoring applications. Easy to install and calibrated from the factory, it provides dependable control and precise pressure sensing for both high and low airflow conditions.

 

Features:

• OEM Replacement for Lennox 40W05 and 101599-05
• Two distinct pressure activation points: High 1.02" W.C., Low 0.25" W.C.
• Designed for accurate combustion air pressure monitoring
• Durable housing and reliable diaphragm mechanism
• Compatible with a range of 2-stage HVAC systems

 

Applications:

This 2-stage pressure switch is used in residential and light commercial furnaces with multi-stage airflow requirements. It supports proper inducer and blower operation by ensuring system pressures remain within specified thresholds for safe and efficient heating performance.