McDonnell & Miller 247-2 Water Feeder

The McDonnell & Miller 247-2 (Part Number 133800) is a heavy-duty mechanical water feeder specifically designed for steam and hot water boilers requiring consistent cold water makeup. This unit features a built-in No. 2 Switch, providing integrated Low Water Cut-Off (LWCO) functionality with two snap-acting SPDT switches. This configuration ensures that if the water level drops below a safe threshold, the burner circuit is interrupted while simultaneously allowing for alarm or auxiliary signaling. Engineered for proportional feed action, the 247-2 maintains a steady water line independent of electrical service for the feeding mechanism itself. The isolated feed valve design is optimized to minimize lime and scale buildup, while the quick-change replaceable cartridge and strainer allow for rapid field servicing without disturbing the piping. With a maximum water supply pressure of 150 psi and a vessel pressure rating of 30 psi, it remains a standard choice for boiler water level control in commercial and residential hydronic systems.

• Dual Functionality: Combines automatic mechanical feeding with an electrical low water cut-off switch for enhanced boiler safety.
• Fail-Safe Feeding: The mechanical side of the McDonnell & Miller 133800 operates without power, ensuring the boiler receives water even during electrical outages.
• Serviceability: Features a replaceable cartridge valve and strainer, reducing downtime for high-scale environments.
• Proportional Response: Delivers water in proportion to the boiler's needs, preventing the "slugging" common with solenoid-based feeders.
• Durable Construction: Built to handle inlet water temperatures up to 120°F and maximum supply pressures of 150 psi.

Is the McDonnell & Miller 247-2 compatible with both steam and hot water systems?
Yes, this mechanical water feeder is rated for both steam and hot water boilers, provided the vessel pressure does not exceed 30 psi.

What is the purpose of the No. 2 Switch in the 133800 model?
The No. 2 switch adds electrical low water cut-off protection. It uses SPDT switches to shut down the burner and trigger an alarm or secondary device if the water level reaches a critical low point.

Can the cartridge be replaced without removing the entire feeder from the boiler?
Yes, the 247-2 is designed with a quick-change replaceable cartridge and strainer assembly specifically to allow for maintenance while the unit remains in-line.

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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.