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Here is a snip from Belimo's catalog... For on-off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. Control is on-off from an auxiliary contact, digital output, or a manual switch. 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. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. 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 90°. 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 LF24 US 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 between 0° and 95°. (this posting is the responsibility of the poster) |
Kristieavery@dfwind.com (Kristie Avery) for more information. All emails will be forwarded to the poster's actual email address.
