800-543-9038 USA866-805-7089 CANADA203-791-8396 LATIN AMERICA285LMX120-3 On/Off, Floating Point, Non-Spring Return, 100 to 240 VACTorque min. 45 in-lb for control of damper surfaces up to 11 sq ft.ApplicationFor On/Off and floating point control of dampers in HVAC systems. Actuator sizingshould 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 diameterby means of its standard universal clamp. Shafts up to 3/4” diameter can beaccommodated by an accessory clamp.OperationThe actuator is not provided with and does not require any limit switches, but iselectronically protected against overload. The anti-rotation strap supplied with theactuator will prevent lateral movement.The LMX series provides 95° of rotation and a visual indicator which indicates positionof the actuator. When reaching the damper or actuator end position, the actuatorautomatically stops. The gears can be disengaged with manual release on theactuator cover.The LMX120-3 actuators use a sensorless brushless DC motor, which is controlled byan Application Specific Integrated Circuit (ASIC). The ASIC monitors and controls theactuator’s rotation and provides a digital rotation sensing (DRS) function to preventdamage to the actuator in a stall condition. Power consumption is reduced in holdingmode.Add-on auxiliary switches or feedback potentiometers are easily fastened directly ontothe actuator body for signaling and switching functions.Dimensions (Inches [mm])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]To center ofmounting slot.Technical DataLMX120-3Power supplynominal100 to 240 VAC, 50/60 Hztolerance85 to 265 VAC, 50/60 HzPower consumption2 W (0.5 W)Transformer sizing4 VA (Class 2 power source)Electrical connection18 GA appliance rated cable1/2” conduit connectorprotected NEMA 2 (IP54)3 ft [1m] 10 ft [3m] 16 ft [5m]Overload protectionelectronic throughout 0 to 95° rotationControlon/off, floating pointInput impedance600 Angle of rotationmax. 95°, adjustable with mechanical stopTorque45 in-lb [5 Nm]Direction of rotationreversible withswitchPosition indicationreflective visual indicator (snap-on)Manual overrideexternal push buttonRunning time150, 95, 60, 45, or 35 secondsconstant independent of loadHumidity5 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]HousingNEMA 2, IP54, UL enclosure type 2Housing materialUL94-5VAAgency listings†cULus acc. to UL 60730-1A/-2-14, CAN/CSA E60730-1:02,CE acc. to 2004/108/EEC and 2006/95/ECNoise level<35dB(A)Servicingmaintenance freeQuality standardISO 9001Weight1.1 lbs [0.5 kg]†Rated Impulse Voltage 4kV, Type of action 1, Control Pollution Degree 3.40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.800-543-9038 USA866-805-7089 CANADA203-791-8396 LATIN AMERICA28LMX120-3 On/Off, Floating Point, Non-Spring Return, 100 to 240 VACAccessories K-LM203/4” [20 mm] Shaft ClampAV6-20Shaft ExtensionZG-LMSAShaft Adaptor for 1/2” Diameter ShaftsZG-LMSA-1Shaft Adaptor for 3/8” Diameter ShaftsZS-100Weather Shield - SteelZS-150Weather Shield - PolycarbonateTool-068 mm & 10 mm WrenchS1A, S2AAuxiliary Switch(es)P370Shaft Mount Auxiliary Switch…Feedback PotentiometersNOTE: When using LMX120-3 actuators, only use accessories listed on this page.Typical SpecificationFloating point, on/off control damper actuators shall be electronic direct-coupledtype, which require no crank arm and linkage and be capable of direct mounting to ashaft from 1/4” to 5/8”. Actuators shall have brushless DC motor technology and be protected from overload at all angles of rotation. Actuators shall have reversing switchand manual override on the cover. Run time shall be constant and independent of torque. Actuators shall be cULus listed, have a 5-year warranty, and be manufacturedunder ISO 9001 International Quality Control Standards. Actuators shall be asmanufactured by Belimo.Wiring Diagrams1Provide overload protection and disconnect as required.2CAUTION Equipment Damage!Actuators may be connected in parallel.Power consumption must be observed.Meets cULus or UL and CSA Standard requirements without theneed of an electrical ground connection.WARNING Live Electrical Components! During installation, testing, servicing and troubleshooting of this product, it may benecessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical compo-nents could result in death or serious injury.On/Off controlFloating Point or On/Off control M40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.Next >