Belimo AFB24-SR-S Damper Actuator 180 In-lb Spring Return 24V

Product Description

The BELIMO AFB24-SR-S is a spring-return damper actuator rated at 180 in-lb of torque, designed for modulating control of HVAC dampers in commercial and industrial air-handling systems. It operates on a 24 VAC or 24 VDC power supply, drawing 8.5 VA, and accepts an analog control signal for precise positioning across the full damper stroke. The zinc-coated metal and plastic housing carries a NEMA 2 and IP54 enclosure rating, making it suitable for indoor installations where limited moisture exposure is a concern. Licensed HVAC technicians and building automation contractors are the primary installers of this actuator.

The AFB24-SR-S is applied in commercial HVAC systems where modulating damper control is required, such as variable air volume (VAV) boxes, mixed-air plenums, and outdoor air intake dampers. The spring-return function drives the damper to its fail-safe position on loss of power, which is a common code requirement in smoke-control and fresh-air applications. This actuator is suited for both new construction and retrofit installations where a direct-coupled, spring-return design is specified.

Key Features

• 180 in-lb rated torque for reliable damper authority across a range of duct sizes and blade configurations
• Spring-return mechanism provides fail-safe damper positioning on power loss
• Accepts 24 VAC or 24 VDC power supply for flexible system integration
• Analog modulating control signal for continuous, proportional damper positioning
• NEMA 2 and IP54 enclosure rating provides protection against dripping water and dust ingress
• Zinc-coated metal and plastic casing for durability in mechanical room environments

Compatibility

Designed as an OEM-style direct-coupled replacement actuator for commercial HVAC damper assemblies requiring a spring-return, modulating, 24-volt actuator with 180 in-lb of torque.

Installation Notes

Installation should be performed by a licensed HVAC technician or building automation controls contractor. Disconnect and lock out all power to the air-handling unit and control panel before mounting or wiring the actuator. The actuator mounts directly to the damper shaft without a crank arm; verify shaft size and clamp engagement before applying power. Control wiring should comply with applicable local codes and NEMA standards for low-voltage wiring.