Weil McLain 510-811-476 Retrofit Kit

The Weil-McLain 510-811-476 ignition control retrofit kit is a critical field replacement solution designed to transition older boiler systems from obsolete Fenwal 05-21 or 05-31 series controls to the high-reliability Fenwal 35-655505-011 integrated ignition module. This comprehensive kit addresses the common failure points in legacy spark-to-pilot and direct spark ignition sequences, ensuring stable flame rectification and precise timing for commercial and residential boiler cycles. The 35-65 series module features advanced microprocessor control and diagnostic LED capabilities, allowing technicians to quickly troubleshoot lockout conditions or voltage drops. As a direct OEM Weil-McLain part, it maintains the appliance's UL/CSA listing integrity when installed per factory schematic. The kit is fully inclusive, providing the updated module, a high-durability igniter replacement, a dedicated wiring harness, and the necessary hardware to facilitate a clean swap in tight cabinets without the need for improvised mounting solutions or field-crimping proprietary connectors.

Common Technical Questions

• Can I use this kit to replace a different Fenwal series not listed? This kit is specifically calibrated for the parameters of the Fenwal 05-21 and 05-31 series. Cross-referencing the Weil-McLain part number 510-811-476 is essential to ensure the ignition timing and trial-for-ignition intervals match your specific boiler model's gas valve operation.
• Does this include a new flame sensor? The provided igniter replacement kit serves as the ignition source and, in many localized sensing configurations, the flame feedback component. Replacing this alongside the module ensures the microamp signal remains within the manufacturer's specified range.
• Is the module compatible with intermittent pilot systems? This kit is designed for Fenwal 35-65 series conversions, which are typically utilized in 24VAC atmospheric and power-vented configurations where precise spark ignition control is required.

Key Benefits for Technicians

• Eliminates compatibility issues when upgrading from legacy Fenwal 05-21 or 05-31 controllers to modern 35-65 architecture.
• Includes a comprehensive wiring harness to prevent the need for field-splicing aged or brittle conductor insulation.
• Enhances system reliability by replacing both the control module and the igniter simultaneously, reducing callbacks for nuisance lockouts.
• Supports efficient HVAC troubleshooting through the module’s standardized diagnostic feedback and grounding requirements.

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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.