Utica-Dunkirk 550002258 Pressure Switch

The Utica-Dunkirk 550002258 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high-efficiency gas furnaces and boilers. This SPDT air pressure switch is factory-calibrated to a 0.4" WC set point, ensuring the inducer motor generates sufficient static pressure before allowing the ignition sequence to proceed. It features a standard 1/4" barbed connection for secure pneumatic tubing attachment and provides reliable HVAC differential pressure sensing under varying thermal loads. As a direct OEM replacement pressure switch for Utica and Dunkirk heating systems, it maintains the structural integrity and safety certifications of the original equipment. Integrating this condensing boiler pressure switch helps resolve common ignition failures and pressure switch lockout codes, ensuring the system operates within specific manufacturer tolerances for venting and airflow. This robust control is essential for preventing hazardous operation during flue obstructions or mechanical inducer failure.

Key Benefits

• Precise Calibration: Factory-set at 0.4" WC to ensure exact triggering of the furnace control board.
• OEM Compatibility: Specifically engineered for a drop-in fit for Utica-Dunkirk 550002258 applications.
• Versatile Wiring: Single Pole Double Throw (SPDT) configuration allows for varied control logic integration.
• Secure Pneumatic Seal: 1/4" barbed fittings prevent vacuum leaks that lead to intermittent cycling.

Common Questions

What causes a Utica 550002258 pressure switch to fail?
Failure is typically caused by moisture in the sensing lines, a cracked diaphragm, or carbon buildup in the inducer port. Always verify the venting is clear before replacing the switch.

Can I use a switch with a different WC rating?
No. The 0.4" WC rating is specific to the blower performance and venting requirements of the appliance. Deviating from the factory set point can result in unsafe combustion or frequent lockouts.

How do I verify if this SPDT switch is functioning?
Use a manometer to check if the inducer is pulling at least 0.4" WC and a multimeter to verify continuity across the terminals when the set point is reached.

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.