Description
The Weil McLain 511-624-450 is an OEM differential pressure switch designed to provide reliable safety and operational control for compatible Weil McLain boilers. Calibrated to a precise setpoint of 1.18″ WC (inches of water column), this switch monitors pressure differential across the inducer or venting system and interrupts the ignition sequence if proper airflow and draft conditions are not confirmed — helping protect the appliance and occupants from unsafe combustion conditions.
Key Features
- OEM Weil McLain replacement differential pressure switch
- Calibrated setpoint: 1.18″ WC (inches of water column)
- Monitors inducer/draft pressure to verify safe venting conditions before ignition
- Designed as a direct drop-in replacement for compatible Weil McLain boiler models
- Helps prevent unsafe boiler operation due to blocked flue, failed inducer, or inadequate draft
- Supports proper boiler lockout and fault protection sequences
Application
This differential pressure switch is a critical safety component in Weil McLain boiler systems. It is wired into the boiler control circuit and must prove a minimum pressure differential — confirming that the draft inducer is operating correctly — before the control board allows the burner to fire. If the required pressure differential is not achieved, the switch remains open and the boiler will not ignite, preventing hazardous conditions.
Why Choose OEM Parts?
- Ensures correct setpoint calibration for your specific Weil McLain boiler model
- Maintains manufacturer warranty compliance
- Guarantees proper fit and reliable electrical connection
- Reduces callback risk associated with aftermarket substitutions
Specifications
- SKU: 511-624-450
- Brand: Weil McLain
- Switch Type: Differential Pressure Switch
- Pressure Setpoint: 1.18″ WC
- Application: Boiler inducer/draft proving
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