Allanson Transformers 421-BT290 Transformer

The Allanson 421-BT290 is a heavy-duty universal ignition transformer engineered for high-performance oil burner service and replacement applications. Operating on a 120Vac supply voltage, this unit delivers a consistent 10,000Vac secondary voltage at 23mA, ensuring reliable arc initiation even in demanding environments. Designed with a mid-point ground and a durable internal junction box, it simplifies field wiring while maintaining electrical stability. The thumb screw HV terminal configuration allows for secure, tool-free high-voltage lead connections, making it a preferred HVAC burner part for technicians requiring a versatile oil burner transformer. This Allanson transformer is built to withstand the rigorous cycling of residential and commercial heating systems, offering a rugged alternative to standard solid-state ignitors. Its universal mounting footprint ensures compatibility across various burner housings, streamlining HVAC equipment maintenance and reducing the need for multiple truck-stock components.

Key Benefits

• 10kV Secondary Output: High-output voltage provides a crisp, reliable arc for consistent ignition.
• Universal Mounting: Designed as a versatile replacement ignition transformer for various burner brands.
• Integrated Junction Box: Protects terminal connections and simplifies 120V line-side wiring.
• Thumb Screw Terminals: Ensures a tight, vibration-resistant connection for high-voltage cables.
• Mid-Point Grounding: Balances electrical load to minimize electromagnetic interference and component wear.

Common Questions

Is the Allanson 421-BT290 compatible with solid-state ignitor applications?
Yes, this iron-core transformer is often used to replace older ignitors or in environments where professional technicians prefer the durability of a traditional transformer over solid-state electronics.

What is the advantage of the internal junction box?
The internal junction box provides a secure enclosure for the primary 120Vac supply voltage connections, protecting against environmental debris and accidental contact in the field.

Can I use this on a burner that requires a 6,000V output?
It is critical to match the secondary voltage requirements of your specific burner. A 10,000V output provides a stronger arc, but you must verify that the electrode spacing and insulation are rated for this higher voltage.

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.