Shut-off damper with spring return motor – LF 24 or LF 230
Consists of a DTU damper with a 24 or 230 V electric motor added.
The motor is controlled by a single-pole breaking contact. The motor has overload protection and stops automatically when the blade has reached its end stop. Although the current is connected, the motor is not damaged if blocked.
When system voltage is connected, the motor starts and tensions the return spring at the same time. The motor stops at its end position and is not damaged by blockage, although system voltage remains.
When the power is cut, the damper closes when the drive motor freewheels and the return spring pulls the blade back to its original position.
If you want the damper to open instead of close, you can undo the two nuts on the spindle clamp, turn the spindle 90° and tighten the nuts again.
In outdoor installation, the motor should be protected from direct UV radiation.
The motor is installed at a distance from the damper, which makes it easy to insulate the ventilation duct.
There is a separate assembly, measuring, balancing and maintenance instruction for this product.
Ø 250–315 fullfills pressure class C in closed position.