160
G20492-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
LM24-SR (-T) US
Proportional control, non-spring return, direct coupled,
24 V, for 2 to 10 VDC and 4 to 20 mA control signal
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. The actuator operates in response to a 2 to 10 VDC
or, with the addition of a 500 Ω resistor, a 4 to 20 mA input sig-
nal from an electronic controller or positioner. A 2 to 10 VDC
feedback signal is provided for position indication or master
slave applications. (Not available on “-T” versions)
The LM24-SR US provides an electronic angle of rotation
adjustment to limit the actuators rotation 20% to 100% while still
using the full input signal and feedback control range. (Not
available on LM24-SR-T US)
Operation
The anti-rotation strap supplied with the actuator will prevent lat-
eral movement of the actuator. The damper actuator is not pro-
vided with and does not require any limit switches, but is pro-
tected electronically against overload. The angle of rotation is
mechanically limited to 95°. When reaching the damper or actu-
ator end position, the actuator automatically stops. The gears
can be manually disengaged by pressing a button on the actua-
tor cover. The position of the actuator is indicated by a visual
pointer.
The LM24-SR US and LM24-SR-T US actuators use a 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.
Accessories
11533 T-type anti-rotation bracket
22065 L-type anti-rotation bracket (included)
ZG-LMSA Short shaft adaptor
Tool-06 8mm and 10 mm wrench
ZG-R01 500Ω resistor for 4 to 20 mA
Dimensions
[All numbers in brackets are in millimeters.]
Torque min. 35 in-lb, for control of damper surfaces up to 8 sq ft.
LM24-SR US
LM24-SR-T US
TEMP. IND &
REG. EQUIP.
Technical Data LM24-SR US
Power supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power consumption running: 2 W; holding: 1 W
Transformer sizing 4 VA (Class 2 power source)
Electrical connection* LM24-SR US: 3 ft, 18 GA, UL CL2P
plenum cable
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. 0.7 mA )
(not available on LM24-SR-T US
Angle of rotation max 95°, electronically adjustable
20 to 100% on LM24-SR US
Torque min 35 in-lb, Independent of load
Direction of rotation reversible with switch CW/CCW
CW = with an increase in voltage
CCW = with an increase in voltage
Position indication clip-on indicator (not on “-T” models)
Running time 95 seconds
Manual override external push button
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 type NEMA type 2 (-T models Nema type1)
Housing material rating UL 94-5V
Noise level less than 35 dB (A)
Servicing maintenance free
Agency listings UL 873 listed, CSA 22..2
No. 24 certified, CE
Quality standard ISO 9001
Weight 1.2 lbs [0.55 kg]
LM24-SR-T.1 US
Electrical connection Screw terminals (for 26 to 14 GA wire)
Angle of rotation max 95°, adjust. with mechanical stops
Housing NEMA type 1
Feedback No feedback with the LM24-SR-T US
*Standard cable length is 3 ft [1m]. Optional cable lengths of
6 ft [200m] or 10 ft [300m] are available at additional list price.
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