McDonnell & Miller 93-HD Pump Controller

The McDonnell & Miller 93-HD Pump Controller (Part Number 162400) is a heavy-duty combination low water cut-off and pump controller engineered specifically for commercial and industrial steam boiler systems. This unit features a specialized head mechanism designed for seamless integration into existing Model 93 or Model 193 float chambers. By utilizing two snap-acting SPDT switches, it provides precise boiler feed pump control while ensuring critical burner cutout protection during low water conditions. Built to withstand high-demand environments, this replacement head mechanism supports a maximum steam pressure of 150 PSI (10.5 kg/cm²), making it a standard choice for technicians maintaining high-pressure steam applications.

Technical Benefits for Contractors:

• Direct Swap Compatibility: Engineered as a drop-in replacement head mechanism for McDonnell & Miller Series 93 and 193 controls, allowing for rapid service without breaking system piping.
• Reliable Switch Action: Dual SPDT switches provide independent circuits for pump activation and low-level alarm/cut-out, reducing the risk of boiler dry firing.
• High Pressure Threshold: Rated for up to 150 PSI max pressure, ensuring durability in demanding industrial steam loops and large-scale HVAC systems.
• Efficient Field Service: The bolt-on design allows technicians to replace the internal workings and switches at the float chamber, significantly reducing downtime.

Common Questions:

Can the 93-HD be used on hot water boilers?
This specific controller is designed for steam boiler applications. While McDonnell & Miller offers various level controls, the 93-HD is optimized for the logic and pressure requirements of steam systems.

Does this unit include the float chamber?
No, the 162400 is the head mechanism only. It is designed to be installed onto your existing 93 or 193 series float housing to restore pump control and low water cut-off functionality.

What are the electrical requirements for the SPDT switches?
The snap-acting switches are designed for standard industrial voltages; however, technicians should always verify the specific boiler feed pump amp draw against the switch ratings found in the technical datasheet.

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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.