Utica-Dunkirk 550001625 Control Board

The Utica-Dunkirk 550001625 Control Board is the definitive OEM replacement circuit board for Argo AT Series boilers, specifically configured for 4-element electric boilers with power block. Built for high-performance hydronic management, this microprocessor control board regulates the sequential staging of heating elements to maximize efficiency while minimizing electrical load spikes. It features an adjustable operating temperature range from 90°F to 180°F, a fixed 200°F high-limit safety cut-off, and a field-adjustable temperature differential (+/- 4°F to 20°F) to prevent short-cycling. The onboard diagnostics utilize self-diagnostic LED indicators—including T-T call, safety switch status, and circulator relay energization—to streamline troubleshooting of 120V pump circuits and 240V element firing sequences. For contractors maintaining Argo electric hydronic blocks, this genuine Utica-Dunkirk part ensures seamless integration with existing RTD sensors and power distribution blocks in residential and light commercial 12kW to 24kW applications.

• Precision Staging: Advanced microprocessor logic manages Argo AT Series element staging to balance run-time and reduce energy consumption.
• Onboard Diagnostics: Integrated HVAC self-diagnostic LEDs provide real-time feedback on thermostat calls, fault codes, and circulator operation.
• Adjustable Parameters: Allows technicians to fine-tune the boiler temperature differential and set points to match specific system requirements.
• OEM Reliability: Direct replacement 550001625 board ensures full compatibility with the factory 120Vac circulator relay (rated up to 5A) and 24V safety strings.

Is this board compatible with 2-element Argo boilers?
No, the 550001625 is specifically designed for Argo AT Series 4-element boilers. Using this on a 2-element unit may lead to improper staging and safety faults.

Does this control both the elements and the system pump?
Yes, it functions as the central boiler controller, managing both the heating element contactors and the 120V circulator output based on the thermostat call and water temperature.

What do the red flashing LEDs mean on this board?
A flashing red LED typically indicates a system safety fault or a sensor error. Refer to the diagnostic code chart in the AT Series manual to identify whether the issue is a high-limit trip or an RTD sensor failure.

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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.