Belimo NFX24-MFT Actuator

The Belimo NFX24-MFT Actuator is a high-torque, 90 in-lb spring return fail-safe actuator engineered for precise control of dampers in commercial HVAC systems. Utilizing Multi-Function Technology (MFT), this unit supports a wide range of control signals including 4-20mA modulating (via 500 Ohm resistor), PWM (1500 Ohm), floating point, and standard On/Off 24Vac/Vdc operations. The brushless DC motor is managed by an Application Specific Integrated Circuit (ASIC) and a microprocessor to ensure constant runtime and overload protection throughout its 95-degree rotation. Designed for direct-coupled mounting on shafts up to 1.05 inches, it features a manual override crank for testing and a 2-10 VDC position feedback signal for remote monitoring. This robust HVAC damper motor provides reliable mechanical fail-safe operation, ensuring dampers return to a defined position during power loss, making it an essential component for air handling units and zone control.

• Versatile MFT Control: Supports 2-10 VDC, 4-20 mA, PWM, and floating point signals for advanced HVAC automation.
• Fail-Safe Reliability: Mechanical spring return ensures positive close-off or open-air safety during power interruptions.
• Brushless DC Technology: Delivers energy-efficient performance and stall protection without the need for end switches.
• Universal Compatibility: Direct-couples to various shaft sizes (1/2" to 1.05") with a universal clamp and anti-rotation bracket.
• Precision Feedback: Provides accurate 2-10 VDC feedback for real-time position auditing in BAS systems.

How do I wire this for a 4-20mA signal?
To utilize a 4-20mA control signal, you must install a 500 Ohm resistor (typically the ZG-R01) across the input wires to convert the current signal to the required 2-10 VDC range.

Can the fail-safe direction be changed?
Yes. The spring return direction (CW or CCW) is determined by the side of the actuator facing the shaft. Reversing the mounting side effectively changes the fail-safe orientation.

Does this require an external limit switch?
No. The microprocessor-controlled motor detects a stall condition at any point in its rotation, providing overload protection without secondary end switches.

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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.