The Belimo AF24-MFT S US actuator is designed for proportional modulation of dampers and control valves in HVAC systems, providing mechanical spring return operation for reliable fail-safe application. Also includes a torque minimum of 133 in-lb, control 2 to 10 VDC, and feedback 2 to 10 VDC.

The AF24-MFT S US uses a brushless DC motor which is controlled by an ASIC and a microprocessor. The microprocessor provides the intelligence to the ASIC to provide a constant rotation rate and to know the actuator’s exact position. The ASIC then monitors and controls the brushless DC motor’s rotation and provides a DRS function to prevent damage to the actuator in a stall condition, and to generate the position feedback signal without the need for mechanical feedback potentiometers. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.

The AF24-MFT S US is mounted directly to control shafts up to1.05" diameter by means of its universal clamp and anti-rotation bracket. A crankarm and several mounting brackets are available for damper applications where the actuator cannot be direct coupled to the damper shaft. The spring return system provides minimum specified torque to the application during a power interruption. The AF24-MFT US actuator is shipped at +5° (5° from full failsafe) to provide automatic compression against damper gaskets for tight shut-off.

Product Specifications