Belimo NFX24-SR Damper Actuator 90 In-lb Spring Return 24V

Product Description

The BELIMO NFX24-SR is a spring-return damper actuator designed for modulating control of HVAC dampers in air-handling and ventilation systems. It delivers 90 in-lb of torque and operates on a 24 VAC or 24 VDC power supply, drawing 6 VA. The actuator accepts an analog control signal for proportional positioning, making it suitable for variable air volume, economizer, and mixing damper applications. The housing combines zinc-coated metal and plastic casing, and the unit carries a NEMA 2 and IP54 enclosure rating for protection against dripping water and dust ingress. Licensed HVAC technicians and mechanical contractors handle the installation of this type of actuator.

The NFX24-SR is used in commercial and residential HVAC systems where reliable spring-return failsafe action is required. On a loss of power or control signal, the actuator returns the damper blade to its spring-loaded default position, which is critical for smoke-control, outside-air, and exhaust damper installations. The modulating analog input allows precise damper positioning as directed by a building automation system or standalone controller, supporting tight airflow and pressure regulation across a range of system configurations.

Key Features

• 90 in-lb torque output for positive damper control
• Spring-return failsafe action closes or opens damper on power loss
• Accepts analog modulating control signal for proportional positioning
• Operates on 24 VAC or 24 VDC power supply
• NEMA 2 and IP54 enclosure rating resists dripping water and dust
• Zinc-coated metal and plastic housing for durability

Compatibility

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

Installation Notes

Installation should be performed by a licensed HVAC technician or mechanical contractor in accordance with local mechanical codes and the manufacturer wiring diagram. Disconnect and lock out all power to the air-handling unit before mounting or wiring the actuator. Confirm the damper shaft diameter and required rotation angle are compatible with the actuator before final mounting. Do not exceed the rated torque by forcing a bound or obstructed damper blade.

Technical Specifications

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

Standard Information

• Brand: BELIMO
• Manufacturer Part Number: NFX24-SR