800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA
24
Torque min. 133 in-lb, for control of air dampers
Application
For proportional 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. A crankarm and several mounting brackets are
available for applications where the actuator cannot be direct coupled to the
damper shaft.
The actuator operates in response to a 2 to 10 VDC, with the addition of a 5007
resistor, a 4 to 20 mA control input from an electronic controller or positioner.
Operation
The AFA 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 AFA series provides 95° of rotation and is provided with a graduated position
indicator showing 0 to 95°. The AFA has a unique manual positioning mechanism
which allows the setting of any damper position within its 95° of rotation. The
actuator is shipped at +5° position (5° from full fail-safe) to provide automatic
compression against damper gaskets for tight shut-off. When power is applied,
the manual mechanism is released and the actuator drives toward the full fail-
safe position. The actuator will memorize the angle where it stops rotating and
use this point for its zero position for its normal control operations. The manual
override can also be released physically by the use of a crank supplied with the
actuator.
The AFA 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 zero 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.
Dimensions (Inches [mm])
1.97"
3.15" [80]
3.86" [98]
3.25" [82.7]
2.24"
[57]
[50]
1.93"
[49]
2.64"
[67]
0.26" [6.5]
5.85" [148.5]
10.47" [266]
0.35" [9]
0.39" [10]
0.65" [16.5]
0.19" [5]
K4-2 US (supplied)
1/2" Centered
(Default)
3/4" Centered
(Field Selectable)
1.05" Centered
(Field Selectable)
K4-1 US (optional)
3/4" to 1.05"
Adjustable
K4 US (optional)
3/8" to 3/4"
Adjustable
D001
AFA24-SR US
Proportional Damper Actuator, Spring Return Fail-Safe 24V for 2 to 10 VDC and 4 to 20 mA Control Signal.
Technical Data AFA24... US
Power supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power consumption
running 6 W
holding 2 W
Transformer sizing 10 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
Operating range Y 2 to 10 VDC, 4 to 20 mA
Input impedance 100 k7 (0.1 mA), 500 7
Angle of rotation mechanically limited to 95°
Torque 133 in-lb [15 Nm] constant
Direction of rotation
spring reversible with cw/ccw mounting
motor reversible with built-in switch
Position indication visual indicator, 0° to 95°
(0° is spring return position)
Manual override 3mm hex crank (shipped w/actuator)
Running time 150 sec. constant, independent of load,
spring return < 20 sec
Humidity 5 to 95% RH non-condensing
Ambient temperature -22°F to 122°F [-30°C to 50°C]
Storage temperature -40°F to 176°F [-40°C to 80°C]
Housing NEMA type 2 / IP54
Housing material zinc coated metal
Agency listings cULus acc. to UL 873 and
CAN/CSA C22.2 No. 24-93
Noise level max. 45 dB (A)
Servicing maintenance free
Quality standard ISO 9001
Weight 6.0 lbs (2.7 kg.)
K20901 - 01/09 - Subject to change. © Belimo Aircontrols (USA), Inc.
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