McDonnell & Miller 194-7B Controller

The McDonnell & Miller 194-7B (Part Number 167200) is a rugged, industrial-grade Combination Low Water Cut-Off and Pump Controller designed for high-pressure steam applications. Built to manage steam boilers with a maximum pressure of 250 psi, this unit utilizes No. 7B proportional control via a built-in potentiometer switch. This configuration is essential for modulating feed valves, ensuring precise water level maintenance and preventing dry-fire conditions. The 194-7B controller features a heavy-duty float mechanism and a manual reset option to comply with safety protocols for commercial and industrial boiler water level control. For technicians replacing older 194 series legacy units, the 167200 pump controller offers a direct-fit solution that maintains system integrity under high-heat and high-vibration environments. Its mechanical float operation remains a reliable standard for contractors seeking to optimize steam boiler safety and feedwater efficiency without the complexity of purely electronic probes.

Key Benefits:

• High-Pressure Rating: Engineered for 250 psi steam boiler systems, providing reliable performance in demanding utility and process steam environments.
• Precision Feedwater Modulation: The integrated potentiometer switch allows for proportional control of the water feeder, reducing hunting and thermal shock.
• Dual Functionality: Serves as both a low water cut-off safety and a primary pump controller, streamlining the mechanical footprint on the boiler.
• Field-Proven Reliability: The robust float-and-bellows construction stands up to sediment and scale better than sensitive electronic alternatives.

Common Questions:

Can the 194-7B be used on hot water boilers?
This specific model is designed for steam boiler applications. For hot water systems, refer to the manufacturer's specific flow-sensing or probe-style LWCO units.

What is the purpose of the potentiometer in the 167200?
The potentiometer provides a variable signal to a modulating feedwater valve, allowing the system to maintain a steady water level rather than simple on/off cycling.

How do I verify compatibility with my existing piping?
The McDonnell & Miller 194-7B typically utilizes 1-1/4 inch NPT connections. Always verify the center-to-center dimensions of your existing water column before installation.

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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.