Submittal Sheet

142
J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.
GMB24-SR
Proportional Control, Non-Spring Return, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20 mA
Technical Data GMB24-SR
Power Supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power Consumption 4.5 W (2W)
Transformer Sizing 6.5 VA (Class 2 power source)
Electrical Connection 3 ft, 18 GA plenum rated 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 (max 0.5 mA)
Angle of Rotation max. 95°, adjust. with mechanical stop
Torque 360 in-lb [40 Nm]
Direction of Rotation
reversible with switch. Actuator will move:
=CCW with decreasing control signal (10➞2V)
=CW with decreasing control signal (10➞2V)
Position Indication reflective visual indicator (snap-on)
Manual Override external push button
Running Time 150 seconds, constant independent of load
Humidity 5 to 95% RH non condensing
(EN 60730-1)
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 2/IP54
Housing Material UL94-5VA
Agency Listings† cULus acc. to UL 60730-1A/-2-14,
CAN/CSA E60730-1, CSA C22.2
No. 24-93, CE acc. to 89/336/EEC
Noise Level <45dB(A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 3.4 lbs [1.55 Kg]
†Rated Impulse Voltage 800V, Type of action 1,
Control Pollution Degree 3.
Torque min. 360 in-lb for control of damper
surfaces up to 90 sq ft.
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, 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.
Operation
The actuator is not provided with and does not require any
limit switches, but is electronically protected against overload.
The anti-rotation strap supplied with the actuator will prevent
lateral movement.
The GMB series provides 95° of rotation and a visual indicator
indicates position of the actuator. When reaching the damper or
actuator end position, the actuator automatically stops. The gears
can be manually disengaged with a button on the actuator cover.
The GMB24-SR… actuators use a sensorless Brushless DC
motor, which is controlled by an Application Specific
Integrated Circuit (ASIC). The ASIC monitors and controls the
actuator’s rotation and provides a digital rotation sensing
(DRS) function to prevent damage to the actuator in a stall
condition. Power consumption is reduced in holding mode.
Add on auxiliary switches or feedback potentiometers are
easily fastened directly onto the actuator body for signaling
and switching functions
Dimensions
(All numbers in brackets are in millimeters.)
2.9” [72.9]
4.55” [115.6]
7.02” [178.4]
5.37” [136.4]
1.42”
[36]
5.6” [142.4]
2” [50.8]
1/2” to 1.05” [12.7 to 26.67]
2/5” to 1.05” [10 to 26.67]
©
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