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Belimo AFB24
MSRP: $735.00
Price: $334.43
You Save: $400.57 (54 %)


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Belimo Part: AFB24
Torque min. 180 in-lb, for control of air dampers
Control Damper Actuator for HVAC Temperature Control
Control Valve Actuator for HVAC Temperature Control
For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturers specifications. Control is On/Off from an auxiliary contact, or a manual switch.
The actuator is mounted directly to a damper shaft up to 1.05 in diameter by means of its universal clamp. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft.
The AFB and AFX series actuators provide true spring return operation for reliable failsafe 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 AFB and AFX series provides 95 of rotation and is provided with a graduated position indicator showing 0 to 95.
The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.
The AFB24-S and AFX24-S versions are provided with two built-in auxiliary switches. These SPDT switches are provided for 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 AFB24, AFB24-S, AFX24 and AFX24-S actuator is shipped at +5 (5 from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.
Technical Attributes
Product: AFB24
180 in-lb [20 Nm]
Control Input
Input Impedance
Position Feedback
Running Time (motor)
<75 seconds
Running Time (fail-safe)
20 sec @ -4F to +122F [-20C to +50C], <60 sec @ -22F [-30C]
Auxiliary Switch
Power Supply
24 VAC 20%, 50/60 Hz, 24 VDC +20% / -10%
Power Consumption
Running: 5 W; Holding: 2.5 W
Transformer Sizing
7.5 VA (Class 2 power source)
Electrical Connection
3 ft, 18 GA appliance cable, 1/2" conduit connector
Overload Protection
Electronic throughout 0 to 95 rotation
Shaft Diameter
Standard: 1/2" to 1.05" round, centers on 1/2" and 3/4" with insert, 1.05" without insert
Angle of Rotation
95 (adjustable with mechanical end stop, 35 to 95)
Direction of Rotation (motor)
Reversible with CW/CCW mounting
Direction of Rotation (fail-safe)
Reversible with CW/CCW mounting
Position Indication
Visual indicator, 0 to 95 (0 is spring return position)
Manual Override
5 mm hex crank (3/16" Allen), supplied
Max. 95% RH non-condensing
Ambient Temperature
-22F to +122F [-30C TO +50C]
Ambient Temperature (safety)
Storage Temperature
-40F to +176F [-40C TO +80C]
Noise Level
<50dB(A) motor @ 75 seconds, <62dB(A) spring return
Housing Material
zinc coated metal and plastic casing
NEMA 2, IP54, Enclosure Type 2
Agency Listing
cULus acc. To UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. To 2004/108/EC & 2006/95/EC
Quality Standards
ISO 9001
4.6 lbs (2.1 kg.); 4.9 lbs (2.25 kg.) with switches
Item Number: AFB24
Manufacturer: Belimo
Manufacturer Part No: AFB24

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