Belimo NFB24-SR Damper Actuator 90 In-lb Spring Return 24V

Product Description

The BELIMO NFB24-SR is a spring-return damper actuator rated at 90 in-lb of torque, designed for modulating control of HVAC dampers in commercial and residential air-handling applications. It accepts an analog control signal and operates on 24 VAC or 24 VDC power at a draw of 6 VA. The zinc-coated metal and plastic casing carries a NEMA 2 and IP54 enclosure rating, providing reliable protection against drip and dust ingress in typical mechanical room and air-handling unit environments. Licensed HVAC technicians and building automation controls specialists are the primary installers of this device.

The NFB24-SR is suited for use on variable-air-volume (VAV) boxes, mixing boxes, outside-air dampers, and exhaust dampers where a modulating analog signal is required. The spring-return function drives the damper to its fail-safe position on loss of power, making it appropriate for applications with life-safety or energy-management requirements. It is commonly installed in light commercial and commercial HVAC systems where 24-volt control wiring is standard.

Key Features

• 90 in-lb rated torque for reliable damper positioning across a range of blade sizes
• Spring-return mechanism provides fail-safe damper positioning on power loss
• Analog modulating control signal for precise airflow regulation
• Accepts 24 VAC or 24 VDC power supply for flexible integration
• NEMA 2 and IP54 enclosure rating resists drip and dust ingress
• Zinc-coated metal and plastic casing for durable, corrosion-resistant construction

Compatibility

Designed as an OEM-style replacement or new-installation actuator for commercial and residential HVAC damper assemblies requiring a 24-volt, spring-return, modulating actuator with a 90 in-lb torque rating.

Installation Notes

Installation should be performed by a licensed HVAC or controls technician. De-energize the control panel and disconnect power to the actuator circuit before mounting or wiring. Verify that the damper shaft size and actuator mounting bracket are compatible before installation. Follow applicable mechanical and electrical codes, including NEC low-voltage wiring requirements, for all field wiring connections.

Technical Specifications

• Torque: 90 in-lb
• Control Signal: Analog (Modulating)
• Power Supply: 24 VAC or 24 VDC
• Supply VA: 6 VA
• Nominal Supply Voltage: 24 VAC
• Enclosure Rating: NEMA 2, IP54
• Housing Material: Zinc Coated Metal and Plastic Casing

Standard Information

• Brand: BELIMO
• Manufacturer Part Number: NFB24-SR