I20683 - Subject to change.
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 500Ω 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 TAF 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 TAF series provides 95° of rotation and is provided with a
graduated position indicator showing 0 to 95°. The TAF has a
unique manual positioning mechanism which allows the set-
ting 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 TAF 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.
For all accessories, see pages 110 and 132.
Dimensions
[All numbers in brackets are in millimeters.]
TAF24-SR
Proportional Damper Actuator, Spring Return Fail-Safe, 24 V for 2 to 10 VDC and
4 to 20 mA Control Signal. Output Signal of 2 to 10 VDC for Position Indication
Technical Data TAF24-SR
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 100kΩ (0.1 mA), 500Ω
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: 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 UL 873 listed, CSA C22.2 No. 24 certified
Noise level max. 45 dB (A)
Servicing maintenance free
Quality standard ISO 9001
Weight 6.0 lbs (2.7 kg.)
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