Allanson Transformers 2721-629 Transformer

The Allanson 2721-629 Ferromagnetic Ignition Transformer is a field-proven high-voltage solution designed for constant-duty performance in oil-fired heating systems. This 120V ignition transformer features a 10,000V secondary output and a 23mA current rating, providing the necessary spark energy for reliable combustion in Carlin 200, 201, and 500 CRD burners. Built with a double-pole configuration and midpoint ground, this unit ensures superior voltage stability and safety across the secondary circuit. As a direct replacement for Carlin 28220, the 2721-629 integrates seamlessly into existing burner housings, utilizing high-temperature internal windings and single porcelain designs to run cooler and quieter than standard aftermarket units. The ferromagnetic core is engineered to meet stringent EMI and RFI noise emission standards, protecting sensitive electronic controls from interference while maintaining consistent ignition in residential and commercial HVAC oil burner services.

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• Direct Cross-Reference: Optimized as an exact fit for Carlin 28220, minimizing labor time during field replacements.
• Constant Duty Design: Ferromagnetic construction ensures the transformer operates reliably under continuous ignition cycles.
• Enhanced Thermal Regulation: Manufactured with high-temperature wire and porcelain insulators to extend the service life of internal components.
• EMI/RFI Suppression: Built-in noise protection prevents electrical interference with modern primary controls and burner circuitry.
• Technician-Preferred Reliability: Delivers a consistent 10,000V arc for cleaner light-offs and reduced soot accumulation.

Is the Allanson 2721-629 compatible with other burner brands?
While specifically engineered for Carlin CRD series burners, it can be used on any system requiring a 120V primary, 10,000V secondary, and a midpoint ground configuration, provided the physical mounting matches.

What does 'Mid Point Ground' mean for my installation?
In a midpoint ground transformer, the center of the secondary winding is grounded to the case. This reduces the voltage stress on the insulation by half relative to the ground, increasing safety and transformer longevity.

How do I know if I need to replace my current ignition transformer?
Technicians should check for a weak or intermittent spark, cracked porcelain bushings, or carbon tracking on the casing. If the burner is failing to ignite despite receiving fuel and power, the transformer may be nearing the end of its functional life.

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.