York S1-024-27659-001 Pressure Switch

The York S1-024-27659-001 is a high-duty HVAC pressure switch replacement engineered for precise draft inducer monitoring within York, Coleman, and Luxaire gas furnaces. This SPST air pressure switch functions as a primary safety limit, utilizing a -0.90" WC pressure switch setpoint to verify that the venting system is clear and the inducer motor is moving sufficient air for safe combustion. Equipped with a rugged diaphragm and a 1/4 barbed connection, it provides a reliable pneumatic seal for standard vacuum tubing. In the field, this furnace draft inducer switch is essential for preventing the ignition sequence if the atmospheric pressure differential is insufficient, thereby mitigating the risk of flue gas recirculation. Technical professionals prefer this OEM component for its exact calibration and compatibility with factory control boards, ensuring the furnace maintains its designed sequence of operation without the need for field adjustments. Its robust construction ensures long-term reliability in high-cycle environments where temperature fluctuations can affect low-voltage sensing components.

• OEM Calibration: Factory-set at -0.90" WC for exact compatibility with York, Luxaire, and Coleman air handling units.
• Standardized Porting: Features a 1/4-inch barbed inlet to ensure a secure fit with existing furnace vacuum lines.
• Electrical Configuration: Single Pole Single Throw (SPST) normally open contacts designed for standard 24V control circuits.
• Safety Compliance: Crucial for ensuring combustion air proving and preventing operation during venting obstructions or inducer failure.

Common Questions

Why is my York furnace pressure switch stuck open? This status usually indicates an issue with the draft inducer motor, a clogged condensate drain, or a blockage in the chimney or vent pipe. Always use a manometer to confirm the system is reaching the -0.90" WC pressure switch threshold before replacing the component.

How do I test the SPST air pressure switch? With the furnace off, disconnect the wires and check for continuity. The switch should show an open circuit. When the inducer motor runs and reaches the specified vacuum, the contacts should close, showing zero ohms. If the circuit stays open while under suction, the switch requires replacement.

Can this switch be used in place of a different WC rating? No. It is vital to match the specific Water Column rating on the label. Installing a switch with a different setpoint can cause the furnace to run under unsafe conditions or result in constant ignition failure codes.

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.