Utica-Dunkirk 240008782 transformer

For veteran HVAC contractors servicing hydronic systems, the Utica-Dunkirk 240008782 transformer is a precise OEM replacement designed for high-demand residential and light commercial boilder applications. This step-down unit features a 120V primary input and a reliable 24V secondary output, delivering a robust 50VA power rating. Optimized for the Utica MGC Series and Dunkirk XEB Series II, this 60Hz transformer provides the necessary VA capacity to power modern control boards, zone valves, and smart thermostats without the risk of nuisance trips often associated with undersized 40VA components. The 50VA HVAC transformer construction ensures stable voltage regulation and thermal efficiency, maintaining secondary circuit integrity even under peak inductive loads from multiple relay coils or zone controllers. Utilizing genuine Utica-Dunkirk boiler parts like the 240008782 maintains the original equipment’s engineering specifications, ensuring seamless physical mounting and electrical frequency compatibility across compatible hydronic heating systems.

• 50VA High-Capacity Output: Provides 25% more overhead than standard 40VA units, effectively supporting additional low-voltage accessories and smart controls.
• Broad Series Compatibility: Directly replaces failed units in Dunkirk XEB and Utica MGC boiler systems with zero field modifications required.
• OEM Electrical Precision: Precision-wound coils ensure a consistent 24V secondary voltage, preventing "chattering" contactors and control board communication errors.
• Industrial-Grade Thermal Performance: Built to withstand the high ambient temperatures of a boiler cabinet while maintaining efficient power transfer.

Is the 240008782 transformer compatible with non-Utica systems?
While designed primarily for Utica-Dunkirk boilers, this is a standard 120V to 24V step-down transformer. It can be used in any 24V control circuit requiring up to 50VA, provided the physical footprint and mounting configuration align with your housing.

Why would my 50VA transformer keep blowing after installation?
Persistent failure usually indicates a short circuit on the secondary side, such as compromised thermostat wiring or a failing zone valve coil. Always verify total VA draw; if your combined load exceeds 50VA, you may need to isolate accessories with an additional transformer.

Does this unit hum or vibrate during operation?
Minimal humming is normal due to electromagnetic induction in the iron core. However, excessive noise often signals loose mounting or an overloaded circuit that is stressing the transformer’s windings.

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.