Xylem 42S Low Water Cut-Off and Pump Controller for Steam Boilers

The Xylem McDonnell & Miller 42S is a combination float-operated low water cut-off and pump controller designed for steam boilers that have a separate water column. This control is ideal for residential, commercial, and industrial low and medium pressure steam boiler applications.

Key Features:

• Two 120-volt, bi-metal, two-wire, single pole, single throw snap switches with automatic reset
• Monel bellows construction provides excellent corrosion resistance
• Maximum operating pressure of 50 PSI
• 1-inch FIP tapped connection for easy installation
• Float-operated mechanism ensures reliable water level monitoring
• Dual-function design combines low water cut-off protection with pump control capability

The 42S connects to the boiler using equalizing pipe installation and is designed for boilers of any steaming capacity. This control provides essential safety protection by automatically shutting down the boiler when water levels drop too low, preventing dangerous dry-fire conditions. The integrated pump controller function helps maintain proper water levels by automatically controlling feed pump operation.

McDonnell & Miller, a Xylem brand, has been delivering reliable performance and safety in boiler control products for over 95 years, making the 42S a trusted choice for steam boiler applications.