Allanson Transformers 2721-411 Transformer

The Allanson 2721-411 Ignition Transformer is a heavy-duty oil burner transformer engineered for high-demand residential and commercial heating applications. Specifically designed as a drop-in OEM replacement for ABC and Sunray burner systems, this unit ensures reliable arc stabilization and consistent ignition cycles. Operating on a 120V AC primary supply, it generates a robust 10,000V secondary output at 23mA, providing the high-voltage discharge necessary to bridge electrode gaps in cold-start environments. Its mid-point ground configuration enhances circuit stability, while the 250 VA power rating ensures it handles industrial-grade electrical loads without overheating. For technicians troubleshooting intermittent ignition or weak spark issues, this ferromagnetic transformer delivers a cooler, quieter operation compared to legacy components, utilizing high-temperature wire and a single-porcelain bushing design to mitigate electrical leakage and RFI interference.

Key Benefits:

• Precise Compatibility: Direct replacement transformer for ABC burners and Sunray models, ensuring exact terminal alignment and mounting.
• Superior Insulation: Features a single porcelain design and high-temperature lead wires to prevent arcing and dielectric breakdown.
• Noise Suppression: Advanced EMI and RFI protection meets North American and European standards for reduced electronic interference.
• Enhanced Thermal Profile: Engineered to run at lower ambient temperatures, extending the operational life of surrounding burner controls.
• Optimized Ignition: The 10kV / 23mA output provides a consistent, high-energy spark for efficient fuel combustion.

Common Questions:

Can I use the Allanson 2721-411 to replace a solid-state ignitor?
This is a traditional iron-core transformer. While it provides superior durability in harsh environments, always verify that your burner housing and mounting plate are configured for a standard transformer footprint rather than a low-profile electronic ignitor.

What does the mid-point ground mean for my wiring?
The mid-point ground design balances the electrical secondary across the chassis, which is critical for safety and reducing stress on the insulation. Ensure your burner frame is properly grounded to maintain the integrity of the 10,000V circuit.

Why is my burner failing to ignite despite having 120V at the primary?
If the Allanson 2721-411 has input voltage but no spark, check for cracked porcelain bushings or carbon tracking on the electrodes. Weak sparks often result from secondary winding degradation, which this 23mA unit is designed to eliminate.

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.

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