York S1-2940-3151 Pressure Switch

The York S1-2940-3151 Pressure Switch is a critical safety component designed for specific York, Luxaire, and Coleman gas-fired furnaces. Calibrated to a .3" WC set point, this SPST (Single Pole Single Throw) normally open switch monitors the pressure differential created by the inducer motor to ensure proper venting before the ignition sequence begins. It serves as a direct OEM replacement for older York furnace pressure switches, maintaining the precise WC (Water Column) specifications required to prevent nuisance tripping or unsafe combustion conditions. For service technicians, ensuring the pressure switch hose is clear of obstructions and the inducer housing is pulling the rated vacuum is essential before installation. This component is built to withstand high-temperature environments within the burner cabinet, providing reliable furnace troubleshooting solutions for mid-efficiency and high-efficiency HVAC systems. Proper integration ensures the limit circuit remains closed only when safe airflow is confirmed.

• Factory Calibrated: Precisely set to .3" WC for accurate flue gas monitoring and system safety.
• OEM Compatibility: Exact replacement part for York S1-2940-3151, ensuring zero-modifications during field installation.
• Durable Diaphragm: Engineered to resist fatigue from repeated heating and cooling cycles within the furnace vestibule.
• Electrical Interface: Standard 1/4-inch spade terminals for quick connection to the integrated furnace control board.

What causes a .3" WC pressure switch to fail to close?
Failure is often caused by a restricted flue vent, a failing inducer motor, or a cracked heat exchanger. Always verify the actual vacuum with a digital manometer before replacing the switch.

Can I use a switch with a different WC rating?
No. Pressure switches are calibrated to the specific airflow requirements of the heat exchanger design. Using an incorrect rating can lead to incomplete combustion or dangerous carbon monoxide levels.

Is this switch compatible with LP and Natural Gas units?
Yes, this pressure switch monitors airflow and venting pressure; it is independent of the fuel type used by the burners.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.