Weil McLain 511-624-510 Switch

The Weil McLain 511-624-510 is a high-precision pressure differential switch engineered specifically for residential and light commercial hydronic heating systems. Designed for use with Weil McLain HE and HE II boilers (Sizes 3, 4, and 5), this SPDT pressure switch is a critical safety component that monitors inductor fan operation by sensing air pressure differentials. This specific model features a factory-calibrated 1.00" W.C. setting and is optimized for installations located at 0 to 4000 ft elevation.

For service technicians and contractors, the Weil McLain 511-624-510 ensures consistent ignition sequences by verifying proper venting and combustion air flow before allowing the burner to fire. Its single-pole double-throw configuration provides versatile circuit control, making it a reliable OEM replacement part for maintaining system integrity. When troubleshooting erratic burner cycles or failing fan prove signals on VHE and HE Series units, this differential air pressure switch is the direct spec-match required to restore safe boiler operation without the risks of using non-calibrated aftermarket alternatives.

• System Compatibility: Purpose-built for Weil McLain HE, HE II, and VHE Series gas-fired boilers.
• Precise Calibration: Fixed 1.00-inch water column trip point ensures exact sensing of blower pressure.
• Elevation Specific: Rated for standard and mid-altitude applications up to 4000 feet.
• Reliable Switching: SPDT (Single Pole Double Throw) electrical interface for standard control board integration.
• OEM Quality: Genuine Weil McLain replacement part guarantees fitment and performance in critical safety circuits.

What happens if the pressure switch fails?
If the switch does not close to prove airflow, the boiler control board will lockout, preventing the ignition sequence as a safety precaution.

Can I use this switch at high altitudes above 4,000 feet?
This specific model is calibrated for 0 to 4000 ft elevation. For higher altitudes, a different pressure switch setting is required to account for lower air density.

Will this work if my old switch was rated at 0.95" W.C.?
The 511-624-510 is often used as the standard replacement for various HE-series switches; however, always verify the boiler's specific required setpoint against the 1.00" W.C. rating of this unit.

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.