200
J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.
Technical Data
LMB24-3… on/off-floating
Power Supply
24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power Consumption
1.5 W (0.2 W)
Transformer Sizing
3 VA (Class 2 power source)
Electrical Connection 3 ft, 18 GA plenum rated cable
3 ft, 18 GA appliance rated cable (-S)
1/2” conduit connector
Overload Protection
electronic throughout 0 to 95° rotation
Control
on/off, floating point
Input Impedance
600
Ω
Angle of Rotation
max. 95°, adjust. with mechanical stop
Torque
45 in-lb [5 Nm]
Direction of Rotation
reversible with switch
Position Indication
reflective visual indicator (snap-on)
Manual Override
external push button
Running Time
95 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 UL60730-1A/-2-14,
CAN/CSA E60730-1, CSA C22.2
No. 24-93, CE acc. to 89/336/EEC
(and 2006/95/EC for -S versions)
Noise Level
<35dB(A)
Servicing
maintenance free
Quality Standard
ISO 9001
Weight
1.1lbs [0.5 Kg],
LMB24-3-S
Auxiliary switch
Adj. 0° to 100°, SPDT 3 A (0.5A) @ 250 VAC
Weight
1.4lbs [0.6 Kg]
LMB24-3-P10-T
Electrical connection Screw terminal (for 26 to 14 GA wire)
Feedback
10 k
Ω
, 1W potentiometer
LMB24-3-P5-T bulk pack only)
Feedback
5 k
Ω
, 1W potentiometer
Housing NEMA
1/IP20
LMB24-3-T
Electrical connection Screw terminal (for 26 to 14 GA wire)
Housing NEMA
1/IP20
†Rated Impulse Voltage 800V, Type of action 1,
(1.B for -S version), Control Pollution Degree 3.
1.85
”
[47]
2.34
”
[59.4]
2.6
”
[66]
4.57” [116]
3.47” [88]
3.7” [94]
0.86” [22]
2” [50.8]
1/4” to 3/4” [6 to 20]
5/16” to 3/4” [8 to 26]
LMB24-3 (-S)(-T)
On/Off-Floating Point Control, Non-Spring Return, Direct Coupled, 24 V
Torque min. 45 in-lb for control of damper
surfaces up to 11 sq ft.
LMB24-3
LMB24-3.1
(bulk)
LMB24-3-P10-T
LMB24-3-T
LMB24-3-T.1
(bulk)
LMB24-3-S
LMB24-3-P5-T
LMB24-3-P5-T.1
(bulk)
Application
For on-off and floating point control of dampers in HVAC sys-
tems. Actuator sizing should be done in accordance with the
damper manufacturer’s specifications.
The actuator is mounted directly to a damper shaft from 1/4”
up to 5/8” in diameter by means of its standard universal
clamp. Shafts up to 3/4” diameter can be accommodated by
an accessory clamp.
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 LMB series provides 95° of rotation and a visual indicator
which indicates position of the actuator. When reaching the
damper or actuator end position, the actuator automatically
stops. The gears can be disengaged with manual release on
the actuator cover.
The LMB24-3… 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.
The LMB24-3-S version is provided with 1 built-in auxiliary
switch. This SPDT switch is provided for safety interfacing or
signaling, for example, for fan start-up. The switching function
is adjustable 0 to 95°. The auxiliary switch is double insulated
so an electrical ground connection is not necessary.
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.)
D120
©
H
A
LOM
O
B
r
u
s
hle
s s D C
M
o
to
r
®