Lennox 15W56 WC SPST Pressure Switch - 0.43

The Lennox 15W56 is a Single Pole Single Throw (SPST) pressure switch designed for HVAC applications. This pressure switch is factory-calibrated to actuate at 0.43 inches water column (WC), making it ideal for monitoring combustion air pressure in gas furnaces and other heating equipment.

Key Features:

• SPST (Single Pole Single Throw) switching configuration for simple on/off control
• Pressure setpoint of 0.43" WC for precise combustion air monitoring
• Designed as a genuine OEM replacement part for Lennox heating systems
• Ensures safe furnace operation by verifying adequate combustion air pressure
• Direct replacement for failed or malfunctioning pressure switches

This pressure switch is a critical safety component that prevents furnace operation when insufficient combustion air pressure is detected. It monitors the pressure differential created by the draft inducer motor and signals the control board when proper pressure is achieved, allowing the ignition sequence to proceed.