York S1-024-35275-000 -0.35″ WC SPNO Close On Fall Pressure Switch

Description

The York S1-024-35275-000 is a factory OEM pressure switch engineered as a direct replacement for York HVAC systems. This Single Pole Normally Open (SPNO) switch is designed to close its contacts on a fall in pressure, activating at a set point of -0.35″ WC (inches of water column). It serves as a critical safety and control component, monitoring system pressure and triggering the appropriate response when pressure drops to the specified threshold — protecting equipment from operating under unsafe or out-of-spec conditions.

Key Features

• OEM York replacement part — ensures proper fit and reliable performance
• Set point: -0.35″ WC (inches of water column)
• Switch type: Single Pole Normally Open (SPNO)
• Action: Closes on pressure fall — contacts close when pressure drops to or below the set point
• Designed for use in York residential and light commercial HVAC equipment
• Provides essential safety protection by monitoring system pressure levels

Application

This pressure switch is commonly used in York furnaces and air handling equipment to monitor draft inducer or combustion air pressure. When the monitored pressure falls to the -0.35″ WC threshold, the SPNO contacts close, signaling the control board that proper airflow or draft conditions are present — or conversely, alerting the system to a fault condition depending on system design. Always verify compatibility with your specific York model before installation.

Specifications

• SKU / Part Number: S1-024-35275-000
• Brand: York (Johnson Controls)
• Set Point: -0.35″ WC
• Switch Configuration: SPNO (Single Pole Normally Open)
• Contact Action: Close On Fall
• Part Type: Pressure Switch