Lennox Pressure Switch WC

The Lennox pressure switch line, also called a furnace air pressure switch or draft safety switch, includes OEM replacement controls for Lennox gas furnaces and other HVAC equipment. Each switch monitors air pressure or draft in the system. It sends an on/off electrical signal to the control board when the pressure reaches its set point (measured in inches of water column, "WC). This helps the equipment run safely and as designed.

Key Features:

• Safety protection: Works as a safety interlock, helping prevent the furnace from operating when airflow or venting is not proven.
• SPST switching: Models are generally single-pole, single-throw with normally open contacts. Single-stage and two-stage designs are available across the line.
• Low-voltage control rating: Models are generally rated for low-voltage control circuits, typically 5 amps resistive at 24 VAC.
• Snap-acting design: Snap-acting contacts give a clean, repeatable on/off signal.
• Calibrated set points: Each switch is set to a specific pressure threshold so it matches the original equipment specification.
• OEM replacement: Built as a direct replacement for the original Lennox control, so it restores factory operation.

Choose the child item that matches the pressure setting and part number of the control you are replacing. A properly working pressure switch helps keep your Lennox heating system running safely and reliably.