Technical Data Af24-Econ-R03 Us - Belimo AF24 US Manual

AF24-ECON-R03 US
Proportional Damper Actuator, Spring Return Safety, 24V for Stand-alone Economizer Damper Control using 3 k
Mixed Air Sensor, Built-in Minimum Position Adjustment. Output Signal of 2 to 10VDC for Position Indication.
Technical Data AF24... US
Power supply 24 VAC ± 20% 50/60 Hz,
24 VDC ± 10%
Power consumption
running 6 W
holding 2.5 W
Transformer sizing 10 VA (class 2 power source)
Electrical connection 3 ft, plenum rated cable
1/2" conduit connector
Overload protection Electronic throughout 0 to 95° rotation
Control Signal Y1 3 k NTC Type 10 thermistor,
3 k @ 77°F (25°C) MA setpoint = 55°F
Input impedance Y1 100 k
Y2 100 k
Feedback output, U 2 to 10 VDC (max. 0.7 mA) for 95°
Angle of rotation Max. 95°, adjust. with mechanical stop
Torque 133 in-lb [15 Nm]
Override function See override control table on opposite page
Direction of rotation
spring reversible with cw/ccw mounting
Position indication Visual indicator, 0° to 95° scaled as
0 to 1 (0° is spring return position)
Running time motor 95 sec constant, independent of load
spring < 20 sec @-4°F to 122°F [-20°C to 50°C]
< 60 sec @-22°F [-30°C]
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 running <45 dB (A)
(max) spring return 62 dB (A)
Servicing Maintenance free
Quality standard ISO 9001
Weight 6.0 lbs (2.7 kg)
800-543-9038 USA
26
Application
For proportional control of mixed air setpoint on economizer 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 crank arm 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 3 k thermistor.
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 AF24-ECON-R03 US provide 95° of rotation and are provided with a
graduated position indicator showing 0° to 95°. The actuators are shipped at
+5° (5° from full fail-safe) to provide automatic compression against damper
gaskets for tight shut-off. When power is first applied, the AF24-ECON-R03 US
will move to 0° (full fail-safe). The actuator will now try to close against the 0°
position during its normal control operations.
The AF24-ECON-R03 US 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 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. Power consumption is reduced in holding mode.
Installation
Refer to AF Section of the Standard Actuation and Accessories, Technical
Documentation.
Dimensions (Inches [mm])
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
866-805-7089 CANADA
0.65" [16.5]
0.19" [5]
10.47" [266]
0.39" [10]
2.64"
5.85" [148.5]
[67]
0.35" [9]
0.26" [6.5]
1.97"
[50]
203-791-8396 LATIN AMERICA