Weil McLain 511-330-221 Burner Assembly

The Weil McLain 511-330-221 is a Natural Gas Pilot Burner Assembly designed specifically for heavy-duty commercial and residential atmospheric boilers. This OEM ignition component is engineered for compatibility with Weil McLain LGB, EGH, and PFG series boilers, specifically targeting unit sizes 13 through 23. Technicians will recognize this as a critical intermittent pilot ignition replacement part that ensures stable flame rectification and consistent main burner light-off. The assembly comes pre-configured with a natural gas orifice, a precision ignition-sensing electrode (flame rod), and a high-temperature ignition cable. Its robust construction is built to withstand the rigorous heat cycles inherent in large-scale cast iron boiler operation. When troubleshooting Weil McLain boiler ignition failure, replacing the entire pilot burner assembly is often preferred to ensure factory-spec alignment and reliable signal feedback to the control module.

• Direct OEM Compatibility: Ensures exact fit for Weil McLain LGB Series 2 and PFG Series 3-7 boilers without field modifications.
• Integrated Sensing: Features a built-in flame rod and electrode for accurate flame proving, reducing nuisance lockouts.
• Complete Kit: Includes the pilot burner, orifice, and sensing lead, allowing for a comprehensive replacement of the pilot assembly.
• High-Temperature Durability: Engineered with materials designed for the high-ambient environments of commercial combustion chambers.

Which boiler models use the 511-330-221 assembly?
This assembly is primarily used in Weil McLain LGB, EGH, and PFG boilers ranging from sizes 13 to 23. Always verify your specific series number before installation.

Does this assembly include the ignition cable?
Yes, it includes the factory-attached ignition-sensing cable and the necessary natural gas orifice for immediate connection to the pilot gas line.

What are the signs of a failing pilot burner?
Technicians should look for weak rectification signals, delayed ignition, or cracked ceramic insulators on the ignition electrode, which typically indicate it is time to replace the burner assembly.

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.