York S1-024-35716-000 1.7″ WC SPNO Normally Open Close-on-Fall Pressure Switch

Description

York OEM Pressure Switch — S1-024-35716-000

The York S1-024-35716-000 is a factory-original, Single Pole Normally Open (SPNO) pressure switch engineered to monitor and respond to changes in system pressure within York HVAC equipment. With a set point of 1.7″ WC (inches water column), this switch is configured to close its contacts when pressure falls below the established threshold — a “close-on-fall” or negative-acting operation that is critical for safe, reliable furnace and air handler performance.

How It Works

In normal standby conditions, the switch contacts remain open. When system pressure drops to or below 1.7″ WC — such as when a draft inducer fails to establish adequate negative pressure — the switch closes, signaling the control board to allow or interrupt operation as designed. This safety logic helps prevent unsafe ignition sequences and protects heat exchanger integrity.

Key Features

• OEM York replacement part — ensures compatibility and reliability
• Set point: 1.7″ WC (inches water column)
• Single Pole, Normally Open (SPNO) configuration
• Close-on-fall (negative-acting) switching action
• Designed for use in York furnaces and air handling equipment
• Direct drop-in replacement for original equipment pressure switch

Application

This pressure switch is commonly used as a combustion air proving switch or inducer pressure sensing switch in York residential and light commercial gas furnaces. It verifies that the draft inducer motor is operating and that proper venting pressure has been established before allowing the ignition sequence to proceed.

Why Choose OEM?

Using a genuine York OEM replacement part ensures the switch meets original design specifications for set point accuracy, contact rating, and housing fit — helping maintain system warranty compliance and long-term reliability.