Xylem 193-A-7B Combination Low Water Cut-Off and Pump Controller with 7B Switch

The Xylem McDonnell & Miller 193-A-7B is a combination float-operated low water cut-off and pump controller designed for commercial and industrial steam boilers with water columns. This control provides dual protection by automatically shutting down the boiler when water levels drop dangerously low while simultaneously maintaining optimal water levels through intelligent pump control.

Key Features:

• Combination low water cut-off (LWCO) and pump controller in one unit
• Includes #7B single pole single throw switch with automatic reset
• 135-ohm potentiometer switch for proportional control to maintain constant boiler water levels
• Magnetic repulsion float design eliminates the need for unreliable bellows
• Alternate tappings with 1/2-inch NPT connections for gauge glass and tri-cock installations
• 1-inch NPT main connections for easy installation
• Maximum working pressure: 150 PSI (10.5 kg/cm²)
• Compatible with 120/240 VAC systems
• Maintains consistent water level regardless of pressure fluctuations

This control is ideal for commercial and industrial low or high pressure steam boilers, providing reliable safety protection and automated water level management. The integrated water column design with tappings simplifies installation and reduces the number of components needed. Manufacturer part number 164500.