421-BT-299 Allanson Transformer
Product Overview
The Allanson 421-BT-299 Ignition Transformer is a standard replacement designed for oil burner applications requiring a 120V, 60Hz input and a 10,000V secondary output at 23mA. Built in a large can series with mid-point ground, it ensures safe, efficient, and reliable ignition performance. Its internal wiring compartment provides clean connections, while its robust construction guarantees dependable power in residential, commercial, and industrial heating systems.
Functional Replacement: Replaces Webster 312-25A0202, France LFBV 421BT299.
Key Features & Benefits
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✅ Dependable Ignition Power – Provides a strong, consistent 10,000V secondary output.
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✅ Runs Cooler & Quieter – Designed with high-temperature wiring for safer operation.
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✅ Long-Lasting Reliability – Built for constant duty in demanding heating applications.
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✅ Noise & EMI Protection – Meets American and European noise emission standards.
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✅ Standard Fit – Compatible with multiple OEM burner models and specifications.
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✅ Easy Wiring – Internal wiring compartment keeps connections neat and secure.
Technical Specifications
| Specification | Value |
|---|
| Application |
Oil Burners |
| Input Voltage |
120V AC |
| Frequency |
60Hz |
| Secondary Voltage |
10,000V |
| Current |
23mA |
| Grounding |
Mid-Point Ground |
| Can Size |
Large Can Series |
| HV Terminal |
Zinc Plated Button |
| Poles |
Double |
| Mounting |
Without Base Plate, Internal Wiring Compartment |
Common Symptoms of a Failing Transformer
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⚠️ Weak or No Spark – Burner fails to ignite.
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⚠️ Humming Noise – Excessive vibration or buzzing during operation.
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⚠️ Burner Lockouts – Frequent system resets required.
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⚠️ Overheating – Transformer runs unusually hot.
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⚠️ Intermittent Ignition – Spark not consistent.
Shopping Tips
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🔎 Match Specs Carefully – Always confirm input voltage (120V), frequency (60Hz), and secondary voltage (10,000V) before purchase.
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🔄 Cross-Reference Part Numbers – Directly replaces Webster 312-25A0202 and France LFBV 421BT299.
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🛠 Check Can Size & Terminals – Ensure compatibility with your burner’s large can mount and zinc-plated HV button terminals.
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👨🔧 Professional Installation Recommended – While replacement is straightforward, proper grounding and secure wiring are essential for safety.
FAQ – 421-BT-299 Allanson Transformer
Q1: What burners is this transformer compatible with?
A1: It is a universal replacement for burners requiring a 120V input, 10kV secondary, mid-point ground transformer in a large can format. Directly replaces Webster 312-25A0202 and France LFBV 421BT299.
Q2: Does this transformer include a base plate?
A2: No, this model comes without a base plate, but it features an internal wiring compartment for easy installation.
Q3: How can I test if my transformer is failing?
A3: Signs include weak or no spark, frequent lockouts, or a buzzing noise. A spark tester or Allanson’s Chek-Mate tool can confirm performance.
Q4: Can this transformer run continuously?
A4: Yes, it’s designed for constant duty in oil burner ignition applications.
Q5: What safety precautions should I take?
A5: Always disconnect power before servicing. Ensure proper grounding and follow all manufacturer and HVAC guidelines.
