Allanson Transformers 2721-631A Transformer

The Allanson 2721-631A Ignition Transformer is a heavy-duty power source engineered specifically for ABC and Sunray burners. Designed for high-performance combustion environments, this unit converts a 120Vac supply voltage into a consistent 10,000Vac secondary voltage at 23mA. The midpoint ground configuration ensures electrical stability and reliable arc initiation across the electrodes, which is critical for preventing delayed ignition. Built with a robust internal potting compound, the 2721-631A dissipates heat efficiently, maintaining dielectric strength even during long cycles. This replacement ignition transformer is a direct-fit component, ensuring physical compatibility with existing mounting points on oil burner assemblies. By providing a high-energy spark, it stabilizes the flame and optimizes the fuel-air mixture's ignition, reduces soot buildup, and ensures the HVAC burner system operates within its intended performance parameters.

Key Benefits

• Specifically calibrated for ABC/Sunray burner ignition compatibility.
• Features a high-output 10kV secondary voltage for reliable fuel atomization ignition.
• Midpoint grounding reduces electromagnetic interference and improves safety.
• Compact, durable construction allows for seamless installation in tight burner housings.
• Engineered to withstand the thermal stress common in commercial and residential heating applications.

Common Questions

How do I know if my Allanson transformer is failing?
Technicians should check for cracked bushings, carbon tracking, or a weak spark. If the secondary voltage output drops below nominal levels or fails to sustain an arc across the electrodes, a replacement is necessary.

Does this unit come with mounting hardware?
The 2721-631A utilizes standard mounting patterns for compatible ABC and Sunray housings. Always verify terminal positioning and baseplate dimensions against the existing unit before finalizing the burner repair.

Can I use a 2721-631A for a 240V system?
No, this specific model requires a 120V input. Installing this on a 240V circuit will cause immediate failure of the primary 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.

2721-631A is the cross for France Transformer 28214