York S1-024-35261-000 Pressure Switch

The York S1-024-35261-000 Pressure Switch is a critical safety component designed for precise monitoring of combustion air and exhaust gas flow within high-efficiency HVAC systems. This 1" WC SPNO (Single Pole Normally Open) switch is engineered to close on fall, ensuring that the inducer motor maintains proper static pressure before the ignition sequence initiates. As a direct OEM replacement part, this unit serves as the updated cross-reference for the older S1-024-27638-001 model, maintaining identical electrical ratings and mounting configurations for a seamless drop-in installation. When troubleshooting furnace pressure switch issues, ensure the sensing line is clear of obstructions. This air pressure switch prevents system operation during venting failures, protecting the hardware from potential rollout conditions. For technicians servicing York, Coleman, or Luxaire units, verifying the 1.00 inch water column set point is essential for maintaining equipment performance and adhering to factory combustion specifications.

• Reliable 1.00" WC set point for accurate inducer fan verification and venting safety.
• Standard SPNO configuration ensures compatibility with modern integrated furnace controls.
• Direct cross-reference for S1-024-27638-001, eliminating the need for field modifications.
• Robust diaphragm construction designed to withstand the high-cycle demands of residential and light commercial HVAC applications.

Can I use this switch for a 'Close on Rise' application?
No, this is a 'Close on Fall' switch calibrated for specific pressure drops; utilizing the wrong hardware logic will prevent the control board from cycling the gas valve correctly.

Will this replace my older S1-024-27638-001?
Yes, this is the official manufacturer-designated replacement part with matching technical parameters and electrical pins.

What causes this air pressure switch to fail most frequently?
Most failures are caused by moisture buildup in the sensing tubing, a ruptured internal diaphragm, or soot accumulation in the collector box which affects the static pressure reading.

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.