Description
Weil McLain 511-624-401 Pressure Switch Overview
The Weil McLain 511-624-401 is a factory-specified pressure switch engineered as a direct OEM replacement for Weil McLain boiler systems. Designed to monitor draft or combustion air pressure, this switch provides a critical safety interlock that confirms proper venting and inducer operation before allowing burner ignition — protecting both the appliance and the occupants it serves.
Key Features
- Set-point rating of 1.79″ water column (“wc) for precise pressure sensing
- SPST (Single-Pole, Single-Throw) switching action for straightforward open/close circuit control
- Dual 1/4″ barb port connections for easy hose attachment to the pressure sensing circuit
- OEM Weil McLain replacement part — ensures compatibility and reliable performance
- Compact design for straightforward installation in tight boiler cabinet spaces
Application
This pressure switch is used in Weil McLain gas-fired boilers to verify that the draft inducer is operating at the correct pressure differential before the ignition sequence proceeds. If the required pressure is not achieved — indicating a blocked flue, failed inducer, or venting issue — the switch remains open, preventing unsafe burner operation.
Why Choose OEM Replacement Parts?
Using genuine Weil McLain replacement components ensures the pressure switch meets the exact electrical and mechanical specifications of the original equipment. This maintains system safety certifications, supports warranty compliance, and reduces the risk of nuisance lockouts caused by mismatched aftermarket parts.
Specifications
- Part Number: 511-624-401
- Brand: Weil McLain
- Pressure Set-Point: 1.79″ wc
- Switch Type: SPST (Single-Pole, Single-Throw)
- Port Connection: Dual 1/4″ barb
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