Belimo NFB24-SR Actuator

The Belimo NFB24-SR is a high-torque spring return damper actuator designed for reliable proportional control in HVAC systems. Operating on a 24VAC/DC power supply, it delivers 90 in-lb of torque, making it suitable for larger air handling units and control dampers. This modulating actuator accepts a 2-10VDC control signal, providing precise positioning and feedback for optimized airflow management. Built with a rugged NEMA 2 housing, it ensures fail-safe operation by returning the damper to its original position during power interruptions. The brushless DC motor technology eliminates the need for limit switches, reducing mechanical wear and enhancing long-term performance in demanding commercial environments. Its universal spindle clamp simplifies installation on various shaft sizes, ensuring a secure fit for contractors performing field replacements or new installations.

• High Torque Output: Provides 90 in-lb (10 Nm) to handle increased mechanical resistance in large dampers.
• Precision Control: Utilizes a 2-10VDC input for accurate proportional airflow regulation and monitoring.
• Fail-Safe Reliability: Mechanical spring return ensures the system defaults to a safe state during power loss.
• Simplified Commissioning: Automatic stroke adaptation and a manual override crank streamline the setup process.
• Robust Construction: Overload-protected motor increases operational life without requiring maintenance-heavy limit switches.

What is the typical runtime for the NFB24-SR?
The motor drive time is approximately 95 seconds, while the spring return fail-safe reacts in less than 20 seconds to ensure rapid closure or opening during a power event.

Can this actuator be mounted in any orientation?
Yes, it supports universal mounting, but installers should ensure the spindle clamp is properly torqued to prevent slippage on the damper shaft.

Is the feedback signal compatible with most BMS controllers?
The 2-10VDC feedback signal is a standard industry protocol, allowing seamless integration with most Building Management Systems for real-time position verification.

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.