Belimo NFB24-MFT Actuator

The Belimo NFB24-MFT Actuator is a heavy-duty spring return damper actuator designed for reliable fail-safe operation in commercial HVAC systems. Delivering 90 in-lb of torque, this unit utilizes Multi-Function Technology (MFT) to provide versatile control options, including modulating 2-10 VDC, 4-20mA (via 500 Ohm resistor), PWM (1500 Ohm), and floating point or on/off configurations. Engineered with a brushless DC motor, the NFB24-MFT ensures constant running time regardless of load and incorporates overload protection across its entire 95-degree rotation range. The direct-coupled design allows for easy mounting on jackshafts up to 1.05 inches in diameter using a universal clamp. With a 24VAC/DC power requirement and NEMA 2/IP54 protection, this proportional actuator is the industry standard for economizer units and VAV terminal units where high precision and positive close-off are non-negotiable.

• Universal Compatibility: Programmable MFT technology allows one actuator to adapt to various control signals and applications, reducing inventory requirements.
• Fail-Safe Reliability: True mechanical spring return ensures the damper returns to a safe position during power loss for critical fire, smoke, or ventilation sequences.
• Precision Control: Features Digital Rotation Sensing (DRS) and a microprocessor for accurate positioning and maintenance-free operation without end switches.
• Technician-Friendly Design: Includes a manual override crank for easy setup and testing, plus a clear position indicator for rapid visual verification.

• How do I wire this for 4-20mA signals? To use a 4-20mA control input, you must install a 500 Ohm resistor (such as the ZG-R01) to convert the signal to 2-10 VDC.
• Can this actuator be mounted for clockwise or counter-clockwise fail-safe? Yes, the NFB24-MFT is reversible; the direction of the fail-safe is determined by which side of the actuator is mounted to the shaft.
• What size damper can this 90 in-lb actuator handle? While sizing depends on the damper manufacturer's torque requirements per square foot, this 10 Nm unit is typically suitable for medium-sized air dampers. Always verify the torque requirement of your specific hardware.

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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.