York S1-024-34681-000 .85/1.0/.40″WC Normally Open Pressure Switch

Description

The York S1-024-34681-000 is an OEM replacement normally open (N/O) pressure switch engineered for use in York heating and cooling systems. Designed to monitor and respond to specific air pressure conditions within the equipment, this switch plays a critical role in ensuring safe and efficient system operation by verifying proper airflow before allowing ignition or continued operation.

Product Overview

This pressure switch is factory-calibrated to precise set points, making it a direct drop-in replacement for the original component. Its normally open design means the switch contacts remain open under standard conditions and close when the correct pressure differential is achieved, confirming adequate draft or airflow is present.

Key Specifications

• OEM Part Number: S1-024-34681-000
• Switch Type: Normally Open (N/O)
• Pressure Set Points: .85″ WC / 1.0″ WC / .40″ WC
• Compatible Brand: York
• Application: Furnace / Air Handler Pressure Sensing

Features & Benefits

• OEM-quality construction ensures reliable, long-lasting performance
• Normally open configuration provides a safety-first design — system will not operate without confirmed airflow
• Factory-set pressure thresholds eliminate the need for field calibration
• Direct replacement for York systems — no modifications required
• Protects against heat exchanger damage caused by inadequate venting or blocked flue conditions
• Helps maintain system efficiency and occupant safety

Application

This pressure switch is typically used in York gas furnaces and air-handling equipment to monitor inducer motor operation and flue draft. When the inducer creates the proper negative pressure, the switch closes to signal the control board that combustion conditions are safe. If pressure is insufficient — due to a blocked flue, failed inducer, or restricted vent — the switch remains open and prevents ignition, protecting the heat exchanger and the building’s occupants.

Installation Notes

• Always verify compatibility with your specific York model before installation
• Disconnect power before servicing or replacing the pressure switch
• Inspect hose connections and tubing for cracks or blockages during replacement
• Consult the equipment service manual for wiring diagrams and set point verification