Weil-McLain 511330218 Pilot Assembly, For use with LGB Series 1-2

Weil-McLain Pilot Assembly Kit

Complete pilot ignition assembly kit for Weil-McLain gas boilers and heating systems. This kit provides all the essential components to restore or maintain reliable pilot flame ignition, sensor feedback, and safe operation.

• Kit contents: pilot burner, orifice, sensing lead (thermocouple/thermopile), and ignition cable (spark lead)
• Manufacturer / part reference: Weil-McLain (various part numbers depending on model / fuel type) :contentReference[oaicite:0]{index=0}
• Compatible fuel types: natural gas and/or propane (LP), depending on the specific variant
• Application: used in Weil-McLain boilers to provide pilot flame ignition, flame sensing, and control interface
• Typical included orifice: sized for correct gas flow rate at the operating pressure (specific orifice size depends on boiler model and fuel) :contentReference[oaicite:1]{index=1}
• Electrical / sensing:
  • Sensing lead: thermocouple (or thermopile) that detects pilot flame and provides voltage signal to control valve / gas control
  • Ignition cable (spark lead): provides high-voltage spark to ignite pilot burner
• Physical & dimensional:
  • Weight (example model 511-330-218): ~2 lb :contentReference[oaicite:2]{index=2}
  • Length (example): ~6.13 in :contentReference[oaicite:3]{index=3}
  • Width (example): ~5.0 in :contentReference[oaicite:4]{index=4}
  • Height / thickness: ~0.38 in :contentReference[oaicite:5]{index=5}
• Materials: typically brass, stainless steel, nickel plating, ceramic insulation in leads, high-temperature wire insulation for ignition cable
• Performance & safety:
  • Ensures reliable ignition and maintenance of pilot flame under normal operating conditions
  • Flame sensing must provide sufficient voltage to gas control / valve for proper operation; sensing lead must be properly positioned in flame
  • Orifice design ensures correct flame size / gas flow relative to boiler’s requirements
  • Ignition cable insulation rated for high voltages and heat exposure near burner assembly
• Installation / compatibility:
  • Ensure correct orientation, mounting, and alignment with burner assembly and manifold
  • Select proper orifice size / kit variant per boiler model and fuel type
  • Ensure secure connections and proper insulation of ignition cable and sensing lead
  • Periodic inspection recommended to confirm pilot flame, lead integrity, and secure mounting

Technical & Usage Notes

• Older or degraded pilot assemblies may lead to ignition failure, flame sensing errors, or unreliable operation.
• Replacing the entire pilot assembly (rather than just parts) ensures matched components and optimal performance.
• Use the factory / OEM-recommended variant (orifice size, lead lengths) for your specific Weil-McLain boiler model for best results.
• During servicing, check for carbon buildup, corrosion, or damage on the burner tip, lead insulation, and connection points.
• Double-check fuel pressure and valve settings after installation to confirm that the pilot flame is stable and the sensing lead is well positioned for reliable detection.