Torque min. 180 in-lb, Control DC 2...10 V (DEFAULT), Feedback DC 2...10 V (DEFAULT).
For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. A feedback signal is provided for position indication for master-slave applications. Two AF’s can be piggybacked for torque loads to max. 360 in-lb. Minimum 3/4” diameter shaft. OR Maximum of three AF’s can be piggybacked for torque loads to max. 432 in-lb. Minimum 3/4” diameter shaft. Master-Slave wiring for either configuration. Actuators must be mechanically linked.
When not mechanically linked, actuators must be wired in parallel.
Default parameters for 2 to 10 VDC applications of the AF..-MFT actuator are assigned during manufacturing. If required, custom versions of the actuator can be ordered. The parameters are variable and can be changed by three means: Factory pre-set or custom configuration, set by the customer using PC-Tool software or the handheld ZTH US.
The AF..24-MFT 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 actuators’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 AF..24- MFT is mounted directly to control shafts up to 1.05” diameter by means of its universal clamp and anti-rotation bracket. A crank arm 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 AF..24- MFT actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.
|Product Type||Damper Actuator|
|Actuator Type||Spring Return|
|Torque||minimum 180 in·lbminimum 20 N·m|
|Input Impedance||100 kΩ for 2 to 10 VDC (0.1 mA), 500 Ω for 4 to 20 mA, 1500 Ω for PWM, floating point and On/Off|
|Position Feedback||2 to 10 VDC, 0.5 mA max, VDC variable|
|Running Time (Motor)||150 seconds (default), variable (70 to 220 seconds)|
|Running Time (Spring)||< 20 seconds at -4 ºF to +122 ºF [-20 ºC to +50 ºC], < 60 seconds at -22 ºF [-30 ºC]|
|Auxiliary Switch||2 x SPDT, 3 A (0.5 A) at 250 VAC, UL approved, one set at +10º, one adjustable 10º to 90º|
|Power Supply||24 VAC ±20%, 50/60 Hz, 24 VDC +20% / -10%|
|Power Consumption||7.5 W, 3 W|
|Transformer Sizing||10 VA (class 2 power source)|
|Electrical Connection||(2) 3 ft, 18 GA appliance cables with 1/2" conduit connectors|
|Overload Protection||Electronic throughout 0º to 95º rotation|
|Shaft Diameter||Standard: 1/2" to 1.05" round, centers on 1/2" and 3/4" with insert, 1.05" without insert|
|Angle of Rotation||95º (adjustable with mechanical end stop, 35º to 95º)|
|Direction of Rotation (Motor)||Reversible with built-in switch|
|Direction of Rotation (Fail-Safe)||Reversible with CW/CCW mounting|
|Position Indication||Visual indicator, 0º to 95º (0º is full spring return position)|
|Manual Override||5 mm hex crank (3/16" Allen), supplied|
|Humidity||Max. 95% RH non-condensing|
|Ambient Temperature||-22 to +122 ºF-30 to +50 ºC|
|Storage Temperature||-40 to +176 ºF-40 to +80 ºC|
|Noise Level||< 40 dB (A) motor @ 150 seconds, run time dependent, < 62 dB (A) spring return|
|Housing||NEMA 2, IP54, UL Enclosure Type 2|
|Agency Listing||cULus acc. To UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. To 2004/108/EC & 2006/95/EC|
|Quality Standards||ISO 9001|
|Weight||4.90 lb2.25 kg|