Description
The Belimo AFB24-MFT-S is a heavy-duty spring return damper actuator engineered for reliable, fail-safe operation in commercial and industrial HVAC applications. Delivering 180 in-lb of torque, this actuator is built to handle large damper assemblies with ease while providing precise, responsive control across multiple signal types.
Multi-Function Technology (MFT) Signal Compatibility
The AFB24-MFT-S features Belimo’s Multi-Function Technology (MFT), making it one of the most versatile actuators on the market. A single unit supports multiple control signal types, eliminating the need to stock separate models for different applications:
- 500 Ohm input impedance for 4–20 mA proportional control
- 1,500 Ohm input impedance for PWM (Pulse Width Modulation) control
- Floating point (tri-state) control
- On/Off control
Spring Return Fail-Safe Operation
The spring return mechanism ensures the damper returns to its fail-safe position upon loss of power, a critical safety feature for smoke control, ventilation, and building automation systems. This design provides peace of mind in the event of a power interruption or control signal loss.
Power Supply
- 24 Vac (50/60 Hz)
- 24 Vdc
Integrated Auxiliary Switch
The built-in auxiliary switch provides end-position feedback to the building automation or control system, enabling status monitoring, interlock functions, and system verification without the need for additional external components.
Key Specifications
- Brand: Belimo
- Model / SKU: AFB24-MFT-S
- Torque Output: 180 in-lb
- Actuator Type: Spring Return
- Control Signals: 4–20 mA (500 Ohm), PWM (1,500 Ohm), Floating Point, On/Off
- Supply Voltage: 24 Vac / 24 Vdc
- Auxiliary Switch: Included
Ideal Applications
- Large commercial damper control
- Building automation systems (BAS/BMS)
- Variable air volume (VAV) systems
- Smoke and fire/smoke damper control
- Energy management and economizer applications
The Belimo AFB24-MFT-S combines fail-safe spring return reliability with the flexibility of multi-signal MFT control, making it an ideal choice for contractors and engineers who need a single, adaptable actuator solution across a wide range of HVAC control scenarios.
