Belimo AFB24-MFT-S Motor Actuator

The Belimo AFB24-MFT-S is a high-torque spring return actuator engineered for precise control of damper applications and control valves in commercial HVAC systems. Delivering 180 in-lb of torque, this unit supports Proportional (MFT) control, allowing for field-configuration of 4-20mA control signals (via 500 Ohm resistor) and PWM control (via 1500 Ohm resistor), alongside standard Floating Point and On/Off operations. Operating on 24VAC/DC, the AFB24-MFT-S provides reliable mechanical fail-safe positioning upon power loss. This model features integrated auxiliary switches (2 x SPDT) for end-stop feedback and automation logic. The rugged IP54-rated housing and brushless DC motor technology ensure long-term performance under high static pressure conditions. Technicians can utilize the Multi-Function Technology to adjust running time, torque, and feedback signals to meet specific site requirements, making it a versatile solution for building automation systems (BAS) integrations.

Technical Specifications & Key Benefits

• 180 in-lb Torque: Sufficient force for large-scale dampers and high-close-off valve assemblies.
• Multi-Function Technology (MFT): Provides flexible modulating control configurations including 2-10VDC, 4-20mA, and pulse width modulation.
• Mechanical Spring Return: Ensures a reliable fail-safe position for safety and equipment protection during power interruptions.
• Dual Auxiliary Switches: Built-in S2A switches facilitate easy signaling for fan startup or position verification.
• Universal Power Input: Compatible with both 24VAC and 24VDC power supplies for simplified field wiring.

Common Questions

How do I configure the AFB24-MFT-S for a 4-20mA input signal?
To utilize a 4-20mA control signal, a 500 Ohm resistor must be placed in parallel with the input signal, or the MFT parameters must be adjusted using the Belimo PC-Tool or ZTH US handheld device.

Can the direction of the spring return fail-safe be changed?
The direction of the fail-safe return (clockwise or counter-clockwise) is determined by the orientation of the actuator mounting on the shaft. Ensure the "Spring Return" arrow on the housing matches your required safety sequence.

What is the benefit of the brushless DC motor in this actuator?
The brushless DC motor is microprocessor-controlled, providing constant torque and precise speed regulation while protecting the actuator from motor burnout in stall conditions without the need for limit switches.

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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.