Torque min. 35 in-lb, for control of air dampers.
For modulation or On/Off, fail-safe 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 3/8” up to 1/2” in diameter by means of its universal clamp, 1/2” shaft centered at delivery. For shafts up to 3/4” use K6-1 accessory. The ZG-LFC114 universal mounting kit can be used with the LFC24-3-S US actuator for retrofit of the economizer section of the Trane Voyager unit. Control is floating point from a triac or relay, or On/Off from an auxiliary contact from a fan motor contactor, controller or manual switch.
The LF series actuators provide true spring return operation for reliable fail-safe application and positive close-off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. The LF series provides 95° of rotation and is provided with a graduated position indicator showing 0 to 95°.
The LFC24-3-S US uses a brushless DC motor which is controlled by an Application Specific Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the intelligence to the ASIC to provide a constant rotation rate. The ASIC monitors and controls the brushless DC motor’s rotation and provides a digital rotation sensing function to prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode.
The LFC24-3-S US 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 between 0° and 95°. The auxiliary switch in the LFC24-3-S US is double insulated so an electrical ground is not necessary
|Angle of Rotation||95°|
|Direction of Rotation (Fail-Safe)||Reversible with cw/ccw mounting|
|Power Consumption (Holding)||1 W|
|Actuator Type||Spring return|
|Auxiliary Switches||1 SPDT|
|Degree of Protection||
|Power Consumption (Running)||2.5 W|
|Running Time (Fail-safe)||<25 s|
|Running Time (Motor)||90 s|
|Torque||35 in-lb [4 Nm]|
|Voltage AC/DC||AC/DC 24 V|