Technical Data

1363

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 1/2” and 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

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 0.5...30 V

End point 2.5...32 V

Input Impedance

100 kΩ for 2...10 V (0.1 mA), 500 Ω for

4...20 mA, 1500 Ω for PWM, On/Off and

Floating point

Position Feedback

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 motion motor

selectable with switch 0/1

Direction of motion fail-safe

reversible with cw/ccw mounting

Position indication

Mechanical

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 (minimum position) = 0%

MID (intermediate position) = 50%

MAX (maximum position) = 100%

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

IP54, NEMA 2, UL Enclosure Type 2

Housing material

Galvanized steel and plastic housing

Agency Listing

cULus acc. to UL60730-1A/-2-14, CAN/CSA

E60730-1:02, CE acc. to 2014/30/EU and

2014/35/EU; Listed to UL 2043 - suitable for

use in air plenums per Section 300.22(c) of

the NEC and Section 602.2 of the IMC

Noise level, motor

40 dB(A)

Noise level, fail-safe

62 dB(A)

Servicing

maintenance-free

Quality Standard

ISO 9001

*Variable when configured with MFT options.

†Rated Impulse Voltage 800V, Type of action 1.AA, Control Pollution Degree 3

Torque min. 180 in-lb, Control DC 2...10 V (DEFAULT), Feedback DC

2...10 V (DEFAULT).

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 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.

Dimensions (Inches[mm])

2.31" [58.78]

5.32" [135.01]

1.25" [31.79]

6.77" [172]

0.38" [9.7]

0.26" [6.5]

0.8" [20.38]

0.26" [6.5]

9.69" [246.1]

AFB24-MFT Technical Data Sheet

Modulating, Spring Return, 24 V, Multi-Function Technology®

800-543-9038 USA

866-805-7089 CANADA

203-791-8396 LATIN AMERICA / CARIBBEAN