Weil McLain 511-624-302 Pressure Switch

Replace a failing or sticking draft inducer switch with the genuine Weil McLain 511-624-302 Pressure Switch. This OEM vent pressure switch is factory-calibrated to a precise 1.40" WC (Water Column) set point, specifically engineered for Weil McLain CGi-4 Series 2 boilers and size 4 CGi units. As a safety-critical boiler pressure control, this SPST (Single Pole Single Throw) switch ensures the inducer motor is creating sufficient draft for safe combustion before allowing the ignition sequence to proceed.

The unit features a dual 1/4" barb connection for secure vacuum tubing attachment, preventing nuisance pressure switch lockout codes and intermittent cycling. Its compact, rugged design allows for a direct fit in the original mounting location, though some updated Honeywell-style revisions may require verifying terminal lead placement during field installation. Utilizing authentic Weil McLain boiler parts like the 511-624-302 ensures the system operates within exact airflow tolerances, maintaining high-efficiency performance and preventing dangerous exhaust recirculation.

• Precise 1.40" WC Actuation: Ensures safe venting by verifying optimal negative pressure before gas valve ignition.
• Application Specific: Designed exclusively for CGi Series 2 gas-fired boilers, ensuring absolute mechanical and electrical compatibility.
• Dual Barb Configuration: Features standard 1/4" connections for reliable integration with existing silicone pressure tubing.
• OEM Durability: Constructed with high-grade materials to withstand the high-temperature environment of the combustion assembly.

• Will this fix a 'Pressure Switch Did Not Close' error? Yes, if your diagnostic light indicates a pressure fault, this switch replaces the internal diaphragm or contact set that typically fails due to moisture or age.
• Is this compatible with CGi-3 or CGi-5 models? This specific 1.40" WC switch is calibrated for Size 4 units. Always verify the set point on your existing switch's label before ordering.
• Do I need to calibrate the 1.40" WC setting? No, this is a fixed, factory-set component. Tampering with the calibration screw can lead to unsafe boiler operation.

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.