Xylem 150S Low Water Cut-Off and Pump Controller for Steam Boilers

The Xylem 150S (McDonnell & Miller 171702) is a float-operated combination low water cut-off and pump controller designed for commercial and industrial steam boiler applications. This reliable control device provides critical safety protection against low water conditions while simultaneously managing pump operation for boilers of any steaming capacity.

Key Features:

• Maximum pressure rating of 150 PSI for low or high pressure boiler applications
• Monel bellows construction provides superior corrosion resistance
• Snap-action switches rated for high temperature service environments
• Single pole, single throw (SPST) switch for pump control operation
• Single pole, double throw (SPDT) switch for low water cut-off and alarm actuation
• 1-inch NPT threaded connections for easy installation
• 345 VA pilot duty rating with 7.4A at 120 VAC
• Dual voltage compatibility: 120/240 VAC
• Maximum differential operation prevents nuisance burner shutdowns in low pressure applications

The 150S is engineered for boilers with separate water columns and delivers dependable protection in demanding industrial and commercial heating applications. Optional configurations include manual reset functionality and alternative switch arrangements to meet specific installation requirements.