Belimo Damper Actuator / AF B24-MFT N4

Belimo Damper Actuator / AF B24-MFT N4
NEMA 4, Modulating, Spring Return, 24 V, Multi-Function Technology®

Technical Data
Power Supply 24 VAC, ±20%, 50/60 Hz, 24 VDC, -10% / +20%
Power consumption in operation 7.5 W
Power consumption in rest position 3 W
Transformer sizing 10 VA (class 2 power source)
Shaft Diameter 1/2…1.05” round, centers on 3/4” with insert, 1.05” without insert
Electrical Connection 18 GA appliance cable, 3 ft [1 m], with 1/2” conduit connector
Overload Protection electronic throughout 0…95° rotation
Electrical Protection actuators are double insulated
Operating Range DC 2…10 V (default), 4…20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor), variable (VDC, on/off, floating point)
Operating range Y variable Start point DC 0.5…30 V
End point DC 2.5…32 V
Input Impedance 100 kΩ for DC 2…10 V (0.1 mA), 500 Ω for 4…20 mA, 1500 Ω for PWM, On/Off and Floating point
Position Feedback DC 2…10 V, Max. 0.5 mA, VDC variable
Angle of rotation 95°, adjustable with mechanical end stop, 35…95°
Torque motor 180 in-lb [20 Nm]
Direction of rotation motor reversible with built-in switch
Direction of motion fail-safe reversible with cw/ccw mounting
Position indication Mechanically, 5…20 mm stroke
Manual override 5 mm hex crank (3/16” Allen), supplied
Running Time (Motor) default 150 s, variable 70…220 s
Running time fail-safe <20 s @ -4…122°F [-20…50°C], <60 s @ -22°F [-30°C]
Angle Of Rotation Adaptation off (default)
Override control min. position = 0% , mid. Position = 50% , max. position = 100% (Default)
Ambient humidity max. 95% r.H., non-condensing
Ambient temperature -22…122°F [-30…50°C]
Storage temperature -40…176°F [-40…80°C]
Degree of Protection IP66, NEMA 4X, UL Enclosure Type 4X
Housing material Polycarbonate
Agency Listing cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC
Noise level, motor 40 dB(A)
Noise level, fail-safe 62 dB(A)
Maintenance maintenance-free
Quality Standard ISO 9001
Weight 9.7 lb [4.4 kg]

Application
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/Configuration
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.

Operation
The AF..24-MFT N4 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 AF..24-MFT N4 is mounted directly to control shafts up to 1.05” diameter by means of its universal clamp and anti-rotation bracket. The spring return system provides minimum specified torque to the application during a power interruption. The AF..24-MFT N4 actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.
Installation Note: Use suitable flexible metallic conduit or its equivalent with the conduit fitting. Not suitable for plenum applications.