Belimo FSNF24 Actuator

The Belimo FSNF24 is a fire and smoke damper actuator engineered for UL555 and UL555S applications. This spring-return actuator provides 70 in-lb of torque, ensuring reliable fail-safe operation in life safety systems. Operating on 24 VAC, the unit utilizes a brushless DC motor controlled by an Application Specific Integrated Circuit (ASIC) to maintain constant torque and speed regardless of load variations. Designed for quick-response smoke control, it features a running time of <15 seconds for both motor and spring. The rugged NEMA 2 housing and universal clamp accommodate standard damper shafts, making it a reliable choice for HVAC life safety installations. This model includes a 1m appliance cable for simplified wiring in tight mechanical spaces. Proper actuator mounting and alignment are critical to ensuring the damper reaches its fully closed position during high-temperature events.

• Ensures code compliance for UL555S leakage rated dampers in commercial HVAC systems.
• Delivers consistent 70 in-lb torque for reliable operation under high static pressure.
• Features a failsafe spring return mechanism that triggers upon power loss or thermal link activation.
• Maintains low power consumption during holding, optimizing energy efficiency in large-scale BAS/BMS integrations.
• Compatible with various damper shaft sizes for versatile field replacement or new construction.

What is the maximum square footage this actuator can drive?

The Belimo FSNF24 typically drives dampers up to 12 sq. ft. at 350°F, depending on the damper's torque requirements and air velocity ratings.

Can this actuator be used in manual reset smoke control systems?

Yes, it is designed for use in smoke control sequences, but it must be wired to a thermal sensor or smoke detector per local mechanical codes.

What is the difference between FSNF24 and FSTF24?

The FSNF series provides higher torque (70 in-lb) compared to the smaller FSTF series (18 in-lb), making it suitable for larger fire and smoke dampers.

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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.