Torque min. 266 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 mounts directly to the damper operating shaft
with a universal V-bolt clamp assembly.
Operation
The actuator operates in response to a 2 to 10 VDC or, 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.
The anti-rotation strap supplied with the actuator will prevent lat-
eral movement of the actuator. The angle of rotation is mechan-
ically limited to 95°. When reaching the damper or actuator end
position, the motor stops automatically. The gears can be man-
ually disengaged by simply pressing down the spring loaded but-
ton on the actuator cover. When this button is pressed down,
the damper blades can be adjusted by hand. The position of the
actuator is indicated by means of a scale reading 0 to 1.
The GM uses a brushless DC motor which is controlled by an
Application Specific Integrated Circuit (ASIC). The ASIC moni-
tors and controls the actuator’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 nor-
mal rotation without the need of mechanical end switches.
Dimensions
[All numbers in brackets are in millimeters.]
Technical Data GM24-SR US
Power supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power consumption running: 3 W; holding: 2W
Transformer sizing 7 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 100 kΩ (0.1 mA), 500Ω
Feedback output U 2 to 10 VDC, 0.5 mA max
Angle of rotation mechanically limited to 95°
Torque min 266 in-lb [30 Nm]
Direction of rotation reversible with switch A/B
A = CW with an increase in voltage
B = CCW with an increase in voltage
Position indication 0 to 1 and reversible indicator
Running time 135 sec. independent of load
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
Housing rating UL94V-0 (flammability rating)
Agency listings UL 873 listed, CSA C22.2 No.24 certified, CE
Noise level max. 45 dB (A)
Servicing maintenance free
Quality standard ISO 9001
Weight 4.2 lbs (1.9 kg.)
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