800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA
18
AF24(-S) US
On/Off, Spring Return Fail-Safe, 24V
Torque min. 133 in-lb, for control of air dampers
Application
For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should
be done in accordance with the damper manufacturer’s 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 crankarm and several mounting brackets are
available for applications where the actuator cannot be direct coupled to the
damper shaft.
Operation
The AF 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 consistent torque to the damper with, and without, power applied to the
actuator.
The AF series provide 95° of rotation and are provided with a graduated position
indicator showing 0° to 95°. The AF has a unique manual positioning
mechanism which allows the setting of any damper position within its 95° of
rotation. The AF series actuators are shipped at +5° (5° from full fail-safe) to
provide automatic compression against damper gaskets for tight shut-off. When
power is applied to the AF series, the manual mechanism is released. The
actuators will now try to close against the 0° position during its normal control
operations. The manual override can also be released physically by the use of a
crank supplied with the actuator.
The AF uses a brushless DC motor which is controlled by an Application Specific
Integrated Circuit (ASIC). The ASIC monitors and controls the actuator’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 AF24-S US version is provided with 2 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 +5°, the other
switch function is adjustable between +25° to +85°.
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
Technical Data AF24... US
Power supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power consumption running 5 W
holding 1.5 W
Transformer sizing 10 VA (class 2 power source)
Electrical connection 3 ft, 18 GA appliance cable
1/2” conduit connector
Electrical protection auxiliary switches are double insulated
Overload protection electronic throughout 0° to 95° rotation
Angle of rotation 95°, adjustable 35 to 95° w/ZDB-AF2 US
Torque 133 in-lb [15 Nm] constant
Direction of rotation reversible with CW/CCW mounting
Position indication visual indicator, 0° to 95°
(0° is spring return position)
Manual override 3mm hex crank (shipped w/actuator)
Auxiliary switches 2 x SPDT 7A (2.5A) @ 250 VAC, UL Approved
one set at +5°, one adjustable 25° to 85°
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 steel
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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