Belimo AF24-S US - Technical Data AF24-MFT95 US

800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA
32
AF24-MFT95 US
Proportional Damper Actuator, Spring Return Fail-Safe, 24 V for Use with
Honeywell® Electronic Series 90, or a 0 to 135 7 input
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Application
For proportional modulation of dampers and control valves in HVAC systems.
The AF24-MFT95 US provides mechanical spring return operation for reliable fail-
safe application.
Default/Configuration
Default parameters for 0 to 135 7 Input applications of the AF24-MFT95 US
actuator are assigned during manufacturing. If required, custom versions of the
actuator can be ordered. However the control input cannot be modified via MFT
PC tool software. The parameters noted in the Technical Data table are variable.
These parameters can be changed by three means:
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application.
Operation
The AF24-MFT95 US actuator provides 95° of rotation and is provided with a
graduated position indicator showing 0° to 95°. The actuator will synchronize the
0° mechanical stop or the physical damper or valve mechanical stop and use this
point for its zero position during normal control operations. A unique manual
override allows the setting of any actuator position within its 95° of rotation with
no power applied.This mechanism can be released physically by the use of a
crank supplied with the actuator. When power is applied the manual override is
released and the actuator drives toward the fail-safe position.
The actuator 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 (DRS)
function to prevent damage to the actuator in a stall condition. The position
feedback signal is generated without the need for mechanical feedback
potentiometers using DRS. The actuator may be stalled anywhere in its normal
rotation without the need of mechanical end switches.
The AF24-MFT95 US is mounted directly to control shafts up to 1.05" diameter by
means of its universal clamp and anti-rotation bracket. A crankarm and several
mounting brackets are available for damper applications where the actuator
cannot be direct coupled to the damper shaft. The spring return system provides
minimum specified torque to the application during a power interruption. The
AF24-MFT95 US actuator is shipped at +5° (5° from full fail-safe) to provide
automatic compression against damper gaskets for tight shut-off.
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
(Not selectable via MFT)
Technical Data AF24-MFT95 US
Power supply 24 VAC ± 20% 50/60 Hz
Power consumption
running 6 W
holding 2 W
Transformer sizing 10 VA (class 2 power source)
Electrical connection 3 ft, 18 GA appliance cable
Overload protection electronic throughout 0 to 95° rotation
Operating range WRB 0 to 135 7 Honeywell electronic series 90,
or a 0 to 135 7 input
Feedback output U* 2 to 10 VDC, 0.5 mA max
Mechanical
angle of rotation*
95°, adjustable 35° to 95° w/ZDB-AF2 US
Torque 133 in-lb [15 Nm] constant
Direction of rotation* spring: reversible with cw/ccw mounting
Direction of rotation*
spring 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)
Running time motor* 150 seconds constant
spring <20 sec spring return fail safe position
Angle of Rotation
Adaptation*
Off (Default)
Override control* Min. (Min Position) = 0%
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)
* Variable when configured with MFT options
K20901 - 01/09 - Subject to change. © Belimo Aircontrols (USA), Inc.