Belimo NFBUP-S Actuator

The Belimo NFBUP-S is a high-performance spring return actuator designed for On/Off control in HVAC systems. Providing 90 in-lb of torque, this unit ensures reliable fail-safe operation for large dampers and control valves. Operating on a universal supply voltage of 24 to 240 VAC or 24 to 125 VDC, the NFBUP-S eliminates the need for site-specific power converters, simplifying field installations. It features a built-in auxiliary switch for position signaling and feedback, enhancing system automation and safety monitoring. Built with a rugged NEMA 2 (IP54) housing, this damper actuator is engineered for longevity in demanding environments. The dual-direction mounting and manual override crank provide contractors with necessary flexibility during commissioning. By utilizing a mechanical spring return mechanism, it guarantees a positive close-off during power loss, protecting critical infrastructure from air leakage or freezing conditions.

• Universal Power Compatibility: Runs on any voltage from 24V to 240V, reducing stock requirements and installation errors.
• Integrated Auxiliary Switch: One SPDT switch provides adjustable 0 to 95° signaling for precise end-stop confirmation.
• Fail-Safe Reliability: Robust mechanical spring return ensures the HVAC damper returns to its safety position during power interruptions.
• High Torque Output: Delivers 90 in-lb (10 Nm) to effectively manage high-pressure air handlers and large-scale louvers.
• Fast Installation: Simple clamp design for direct mounting on shafts, saving time on the job site.

What is the typical run time for the NFBUP-S?
The motor drive time is approximately 75 seconds, while the spring return fail-safe closes the damper in less than 20 seconds upon power loss.

Can the NFBUP-S be used in outdoor applications?
The unit features a NEMA 2/IP54 rating; for full outdoor exposure, a protective weather shield should be utilized to prevent moisture ingress.

How do I adjust the auxiliary switch on this actuator?
The internal switch is field-adjustable via a calibrated scale, allowing technicians to set the trigger point anywhere along the 95-degree rotation.

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.