Technical Data
68779
Power Supply 24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10%
Power Consumption Running 1.5 W
Power Consumption Holding 0.2 W
Transformer Sizing 2.5 VA (class 2 power source)
Shaft Diameter 1/4” to 5/8” round, centers on 5/8”, 3/4” clamp
available
Electrical Connection 18 GA plenum rated cable with 1/2” conduit
connector protected NEMA 2 (IP54) 3ft [1m]
10ft [3m] and 16ft [5m]
Overload Protection electronic throughout 0° to 95° rotation
Input Impedance 600 Ω
Angle of Rotation Max. 95°, adjustable with mechanical stop
Torque motor 45 in-lbs [5 Nm]
Direction of Rotation (Motor) reversible with built-in switch
Position Indication reflective visual indicator (snap on)
Manual Override external push button
Running Time (Motor) default 95 sec, variable 35, 45, 60, 150 sec,
constant, independent of load
Ambient Humidity 5 to 95% RH non condensing (EN 60730-1)
Ambient Temperature Range -22...122 °F [-30...50 °C]
Storage Temperature Range -40...176 °F [-40...80 °C]
Housing IP54, NEMA 2, UL Enclosure Type 2
Housing Material UL94-5VA
Agency Listings† cULus acc. to UL60730-1A/-2-14, CAN/CSA
E60730-1:02, CE acc. to 2004/108/EC and
2006/95/EC
Noise Level (Motor) <35 dB (A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 1.1 lb [0.5 kg]
Torque min. 45 in-lb, for control of damper surfaces up to 11 sq. ft.
Application
For On/Off and floating point control 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 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 one 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.
LMB24-3-T
On/Off, Floating Point, Non-Spring Return, 24 V
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 08/30/2018 - Subject to change. © Belimo Aircontrols (USA), Inc.
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