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421-331 ALLANSON LENNOX TRANSFORMER

Manufacturer: Allanson
SKU: ALLANSON:421-331
Product Availability: 1
$100.42
This product must be purchased in increments of 1
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421-331 Allanson Lennox Ignition Transformer

The Allanson 421-331 ignition transformer is a high-reliability, double pole unit designed specifically for Lennox oil burners. With a powerful 10,000V secondary and 120V primary input, this transformer ensures consistent ignition performance under demanding operating conditions. Built with high-temperature wire and designed to manufacturer specifications, the 421-331 provides long service life, quieter operation, and dependable ignition power.


βœ… Key Features

  • Built with high-temperature wire for durability and extended service life

  • Runs cooler, quieter, and safer on oil burners

  • Manufactured to Lennox OEM specifications for guaranteed fit and performance

  • Meets American & European EMI/RFI noise emission standards

  • Single porcelain design for durability and stability

  • Provides dependable ignition source for commercial and residential oil burner applications


πŸ“Š Technical Specifications

SpecificationDetail
Application OIL
Burner Manufacturer Lennox
Burner Type Lennox
Input Voltage 120V
Current 23mA
Grounding Mid-Point Ground
Secondary Voltage 10,000V
Input Frequency 60Hz
Can Size Large Can Series
HV Terminal Zinc Plated Button
Hinge Location End Hinge
Poles Double

⚠️ Common Symptoms of a Failing Ignition Transformer

  • Burner fails to ignite or takes multiple attempts

  • Intermittent ignition or weak spark

  • Sparking noise but no flame established

  • Soot buildup from incomplete combustion

  • Repeated lockouts requiring manual resets

  • Visible cracks, burns, or arcing on transformer casing or terminals


πŸ›’ Shopping Tips – How to Choose the Right Replacement

  1. Match the Primary Voltage β†’ This model is 120V input; check your burner’s rating.

  2. Secondary Voltage & Current β†’ Ensure compatibility with 10,000V @ 23mA ignition requirements.

  3. Grounding Type β†’ The 421-331 uses mid-point ground; incorrect grounding may prevent proper ignition.

  4. HV Terminal & Mounting β†’ Designed with a zinc plated button terminal and end hinge mount.

  5. OEM Compatibility β†’ Built for Lennox oil burners; verify burner type for proper fit.

  6. Replace Proactively β†’ If your transformer shows signs of wear, replacing early helps avoid downtime.


❓ Frequently Asked Questions (FAQ)

Q1: Is this transformer specific to Lennox burners?
Yes, it is designed to Lennox OEM specifications but may also fit other burners requiring the same electrical ratings.

Q2: What is the output voltage?
The secondary output delivers 10,000V at 23mA for reliable ignition.

Q3: Can I use this as a universal replacement?
It is best suited for Lennox applications, but if the specs match (voltage, grounding, and terminal type), it can be used as a replacement.

Q4: Does it reduce electrical noise?
Yes β€” it meets EMI and RFI standards, preventing interference with nearby equipment.

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Products specifications
Voltage 120 Volt AC
Secondary Voltage 10,000 Volts
Hertz 60 Hz
Burner Manufacturer LENNOX