McDonnell & Miller FPC-1000-P Control

The McDonnell & Miller FPC-1000-P Control (Xylem 144705) is a heavy-duty, field-configurable electronic low water cut-off (LWCO) engineered for both steam and hot water boilers. As a universal replacement for the 751P-MT-120, 750, and PSE-800 series, this unit offers the versatility required for residential, commercial, and industrial hydronic systems. This model includes a standard-sized "P" probe and operates at either 24V or 120V, featuring a patented self-cleaning probe that effectively minimizes scale buildup to maintain high-accuracy conductivity monitoring. Designed to comply with ASME CSD-1 safety standards, the FPC-1000-P prevents burner operation during low-water conditions via sophisticated resistance sensing that significantly reduces nuisance trips. The Tri-Function button allows for immediate push-to-test diagnostics, manual reset, and configuration, ensuring the control is properly calibrated as a primary or secondary safety device.

Key Benefits for HVACR Contractors

• Universal Compatibility: Field-configurable to replace virtually any electronic LWCO on the market, supporting both 24V and 120V setups.
• Advanced Conductivity Technology: Patented logic monitors water resistance variability to ensure the burner only shuts down during a verified low-water event.
• Reduced Maintenance: The self-cleaning probe extends the necessary cleaning intervals up to every five years, outperforming standard probes in high-mineral environments.
• Clear System Status: Integrated multi-function LED indicators provide instant visual feedback: Green (Power/Auto), Yellow (Manual Mode), and Red (Low Water Condition).
• Rugged Reliability: Features brass threads for a metal-to-metal seal and a NEMA 1 enclosure to withstand demanding boiler room conditions.

Common Questions & Technical Support

Can I use the FPC-1000-P for both steam and hot water applications?
Yes. The control is field-configurable via internal DIP switches to adjust sensitivity for steam (7,500 ohms) or hot water (20,000 ohms). It must be set during initial installation.

What is the difference between the FPC-1000-P and the 751P-MT-120?
The FPC-1000-P is a universal electronic LWCO that replaces the 751P-MT-120. It offers more flexibility, including dual-voltage support (24V/120V) and configurable reset modes in a single SKU.

How does the self-cleaning probe function?
The probe uses a proprietary design that shed scale and mineral deposits through thermal and electrical variance, ensuring consistent conductivity monitoring without the need for annual manual scrubbing in most systems.

Does this unit lock out if power is lost?
No. The FPC-1000-P is designed to prevent nuisance lockouts during power interruptions as long as the probe remains submerged in water when power is restored.

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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.