AFB24-SR-S N4H | Damper Actuator | 180 in-lb | Spg Rtn | 24V | Modulating | SW | NEMA 4H | WITH HEATER OPTION | Belimo (OBSOLETE)
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Brand: BelimoSKU: AFB24-SR-S N4H
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AFB24-SR-S N4H | Damper Actuator | 180 in-lb | Spg Rtn | 24V | Modulating | SW | NEMA 4H | WITH HEATER OPTION | Belimo (OBSOLETE)

Belimo | AFB24-SR-S N4H
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Details for AFB24-SR-S N4H


Damper Actuator | 180 in-lb | Spg Rtn | 24V | Modulating | SW | NEMA 4H | WITH HEATER OPTION

Damper Actuator | 180 in-lb | Spg Rtn | 24V | Modulating | SW | NEMA 4H


For modulation of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. The actuator is mounted directly to a damper shaft up to 1.05” in diameter by means of its universal clamp. The actuator operates in response to a 2 to 10 VDC, with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication. Not to be used for a master-slave application. Heater must remain powered at all times to ensure proper actuator operation at colder temperatures


The AF..24-SR-S N4 series actuators provide true spring return operation for reliable fail-safe application and positive close off on air tight dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator. The AF..24-SR-S N4 series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The AF..24-SR-S N4 uses a brushless DC motor which is controlled by an Application Specific Integrated Circuit (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 fail-safe position. The ASIC monitors and controls the brushless DC motor’s rotation and provides a digital rotation sensing function to prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. The AF..24-SR-S N4 versions are provided with two built-in auxiliary switches. These SPDT switches provide safety interfacing or signaling, for example, for fan start-up. The switching function at the fail-safe position is fixed at 10°, the other switch function is adjustable between 10° to 90°. The AF..24-SR-S N4 actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

ATTENTION: AF..24-SR-S N4 cannot be tandem mounted on the same damper or valve shaft. Only On/Off and MFT AF.. models can be used for tandem mount applications.

Installation Note: Use suitable flexible metallic conduit or its equivalent with the conduit fitting. Not suitable for plenum applications


Item Number AFB24-SR-S N4H
Brand Belimo
Actuator Type Damper
Control Input Modulating
End Switch Yes
Housing NEMA 4H
Spring Return Spring Return
Torque 180 in-lb
Voltage 24V

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