AF24-LIN US Damper Linearizing Actuator
Damper actuator, Spring Return, 24 VAC/DC power, 2 to 10 VDC and 4 to 20 mA control signal.
Output signal of 2 to 10 VDC for position indication. Programmable rotation with respect to control signal.
I20652 - 04/-06 - Subject to change. © Belimo Air
controls (USA), INC.
1.97"
3.15" [80]
3.86" [98]
3.10" [78]
2.24"
[57]
[50]
1.93"
[49]
2.64"
[67]
0.26" [6.5]
5.85" [148.5]
10.59" [269]
0.35" [9]
0.39" [10]
0.65" [16.5]
0.19" [5]
Standard:
1/2" to 1.05"
Optional*
3/8" to 3/4"
3/8" to 5/8"
*with K4 US
clamp
®
70635-00001
Torque min. 133 in-lb, for control of air dampers
Application
For proportional modulation of dampers where linear air flow
response with respect to input signal is required..
The concept of the linearizing actuator is based on the need
recognized in problem applications where the non-linearities of
dampers themselves, linkages or jackshafts, or other geomet-
ric effects cause severe modification of flow response.
The actuator operates in response to a 2 to 10 VDC, or with
the addition of a 500
Ω
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 or master-
slave applications.
Operation
The AF24-LIN US series actuators provide true spring return
operation for reliable fail-safe application and positive close-off
on control dampers. The spring return system provides con-
stant torque to the damper with, and without, power applied to
the actuator.
The AF24-LIN US series provides 95° of rotation and is pro-
vided with a graduated position indicator showing 0 to 90°.
The AF24-LIN US has a manual positioning crank arm which
allows the setting of any damper position within its 95° of rota-
tion.
The actuator manual override allows pre-load to provide auto-
matic 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 opera-
tions. The manual override can also be released physically by
the use of a crank supplied with the actuator.
The AF24-LIN US uses a brushless DC motor which is con-
trolled by a microprocessor. The actuator may be stalled any-
where in its normal rotation without damage.
The actuator is programmed using ZIP-RS232 hardware and
the laptop software embedded within an Excel® program. The
damper manufacturer provides a chart with the signal versus
required rotation that provides a linear air flow response with
respect to the signal. Alternately the TAB and control contrac-
tor can field adjust the program.
Dimensions
[All numbers in brackets are in millimeters.]
Technical Data
AF24-LIN 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
Motor
3 ft, 18 GA 4 color leads (24V)
Auxiliary switches
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 k
Ω
(0.1 mA), 500
Ω
for 4-20 mA
Feedback output U
2 to 10 VDC (max. 0.5 mA) for 95°
Angle of rotation
Mechanically limited to 95°
Torque
133 in-lb [15 Nm] constant
Direction of rotation
Spring return reversible with CW/CCW
mounting. The control direction switch
can be used to change the action from
direct to reverse.
Position indication
Visual indicator, 0° to 90° (0° is default
spring return position)
Manual override
3mm hex crank (shipped w/actuator)
Running time
150 sec. constant, independent of load,
spring return 19 seconds nominal
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]
Gears
Permanently lubricated
Housing
NEMA type 2 / IP54
Housing material
Zinc coated metal
Agency listings
cULus listed to UL873 and CAN/CSA C22.2
No. 24, CE
Noise level
Maximum 45 dB (A)
Servicing
Maintenance free
Quality standard
ISO 9001, 5 year Belimo warranty
Weight
6.0 lbs (2.7 kg.)
MFT options
Adjustable rotation per volt signal change
D004
1
