Utica-Dunkirk 550001266 Pressure Switch

The Utica-Dunkirk 550001266 Pressure Switch is a critical safety component designed for precise differential pressure monitoring in high-efficiency boilers and HVAC systems. Featuring a Single Pole Double Throw (SPDT) configuration, this switch provides reliable 0.4" WC (water column) set-point detection to ensure proper venting and combustion airflow. As a genuine OEM replacement part, it is engineered to meet the strict tolerances required by Utica and Dunkirk hydronic heating units, effectively preventing the burner from firing if a blocked vent condition or inducer failure is detected. The industrial-grade construction is built to withstand the high-temperature environments of an equipment cabinet, maintaining accuracy across long-term duty cycles.

Technicians rely on the 550001266 switch for its seamless integration with existing control boards and wiring harnesses. Its dual-state output allows for flexible diagnostic feedback, making it an essential part for HVAC system troubleshooting and routine safety maintenance. By ensuring the pressure set-points remain stable, this switch optimizes combustion efficiency and protects the heat exchanger from potential damage caused by improper air-to-fuel ratios.

Key Benefits:

• High-Precision Monitoring: Calibrated specifically for a 0.4" WC trip point to ensure accurate safety lockouts.
• SPDT Versatility: The Single Pole Double Throw design allows for both "normally open" and "normally closed" circuit configurations.
• OEM Compatibility: Designed as a direct drop-in for Utica and Dunkirk boiler components, ensuring a perfect fit without field modifications.
• Vibration Resistance: Robust housing protects the internal diaphragm from mechanical shock and resonance during inducer motor operation.

Common Questions:

• What causes a pressure switch to fail in a Utica boiler? Most failures result from moisture in the sensing lines, a cracked diaphragm, or carbon buildup in the heat exchanger causing pressure fluctuations.
• Can this switch be used in place of an SPST model? Yes, since this is an SPDT pressure switch, you can use only the terminals required for your specific wiring diagram (Com/NO or Com/NC).
• Are the terminals compatible with standard HVAC wiring? Yes, it utilizes standard 3/16" or 1/4" spade connectors typically found on combustion safety circuits.

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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.