York S1-024-35979-000 -0.15″WC SPNO Close On Fall Pressure Switch

Description

The York S1-024-35979-000 is an OEM replacement pressure switch engineered for use in York furnaces and air handling equipment. Designed as a Single Pole, Normally Open (SPNO) device with a Close On Fall action, this switch monitors negative pressure within the combustion or draft inducer circuit and closes its contacts when pressure drops to or below the -0.15″ WC (inches of water column) set point — providing a critical safety interlock that confirms proper inducer operation before allowing ignition to proceed.

Key Features

• OEM York replacement pressure switch — direct fit for compatible York systems
• Set point: -0.15″ WC (inches of water column)
• Switch type: Single Pole, Normally Open (SPNO)
• Action: Close On Fall — contacts close when pressure falls to set point
• Monitors draft inducer or combustion air pressure for safe furnace operation
• Provides safety interlock to prevent ignition under improper draft conditions
• Durable construction for long-term reliability in residential and light commercial HVAC applications

Application

This pressure switch is a direct OEM replacement for York furnaces and heating systems requiring a -0.15″ WC SPNO Close On Fall pressure switch. It plays a vital role in the furnace safety control sequence, ensuring the draft inducer motor is operating correctly before the ignition sequence is allowed to begin. Always verify compatibility with your specific York model before installation.

Why Choose OEM York Parts?

Using genuine York OEM replacement components ensures proper fit, function, and system reliability. OEM parts are engineered to exact factory specifications, helping maintain system efficiency, warranty compliance, and long-term performance.