Description
The Weil McLain 511-624-405 is an OEM replacement pressure switch designed to maintain safe and efficient operation in Weil McLain boiler systems. Set to a 0.75″ water column (“wc) trip point, this switch monitors combustion air pressure to verify proper draft inducer or venting performance before allowing the burner to fire — a critical safety function in today’s high-efficiency heating equipment.
Engineered to Weil McLain’s exact specifications, this direct-replacement switch installs quickly and restores your boiler to factory-correct operation without the guesswork of aftermarket alternatives. It is the ideal solution for HVAC technicians and service professionals performing routine maintenance or troubleshooting pressure-related lockouts on compatible Weil McLain boiler models.
Key Features
- OEM Weil McLain replacement pressure switch
- 0.75″ water column (“wc) setpoint for precise draft pressure sensing
- Monitors inducer/venting pressure to confirm safe combustion conditions
- Direct drop-in replacement — no field modifications required
- Designed for use with compatible Weil McLain boiler models
- Supports safe boiler lockout if proper pressure is not established
Specifications
- Brand: Weil McLain
- Part Number: 511-624-405
- Pressure Setpoint: 0.75″ wc
- Type: Combustion Air / Draft Pressure Switch
- Application: Weil McLain Boilers
Application
This pressure switch is a key safety component in the boiler control sequence. It confirms that the draft inducer is operating correctly and that adequate negative pressure has been established in the flue/venting system before the ignition sequence proceeds. Replacing a faulty pressure switch with a genuine Weil McLain OEM part ensures continued compliance with the original equipment design and maintains system warranty integrity.
Reviews
There are no reviews yet.