Weil McLain 511-330-095 Module

The Weil-McLain 511-330-095 is a 24-volt ignition sensing control module specifically engineered for Series 11 gas-fired residential boilers. This OEM replacement part serves as the central logic for spark-to-pilot ignition sequences, integrating a damper Molex plug-in to ensure synchronized operation between the venting system and the gas valve. Designed for drop-in compatibility, this electronic ignition control is the direct substitute for service technicians maintaining Weil-McLain CG, CGx, PFG, EG, and EGH boiler series. By utilizing precise flame rectification sensing, the module monitors the pilot flame continuously, providing an essential safety interlock that prevents the main gas valve from opening during ignition failure scenarios. When troubleshooting Weil-McLain Series 11 ignition issues, contractors should verify the 24V AC power supply and secure the Molex connection to the automatic vent damper. This boiler control board eliminates the complexity of universal conversion kits by maintaining the original wiring footprint and harness positions required for specialized Series 11 configurations.

• Direct OEM Compatibility: Verified for use in Weil-McLain CG-25 and related Series 11 and 12 gas boiler models.
• Integrated Damper Control: Features a factory-terminated damper Molex connection for seamless communication with the vent damper assembly.
• Enhanced Flame Safety: Employs high-sensitivity spark ignition sensing to detect pilot presence before energizing the main burner circuit.
• Technical Reliability: Standard 24V architecture supports integration with existing Honeywell or White-Rodgers gas valves used in residential applications.

Is the 511-330-095 compatible with Series 6 through 10 boilers?
No, this specific module is designated for Series 11 systems only. Older series using White-Rodgers or Johnson Control systems typically require a full spark pilot conversion kit rather than a single module swap.

What does the 'Damper Molex' connection do?
The Molex plug interfaces directly with the automatic vent damper. The boiler cannot complete its ignition sequence unless the damper proves it is in the fully open position, a critical safety protocol managed by this board.

Can I use this module to troubleshoot a "no spark" condition?
Yes. If the boiler has 24V power and the damper is open but no spark is generated at the pilot assembly, this ignition control module is often the primary failure point, provided the high-voltage lead is intact.

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.