Technical Instructions OpenAir GEB Series Enhanced Rotary Non-Spring Return Damper Actuators
Document Number A6V12029156
December 16, 2021
Page 6 Siemens Industry, Inc.
Figure 6. NEMA Type 4X
Weather Shield.
ASK75.7U: GEB Actuators are UL listed to
meet NEMA Type 4X requirements (a degree
of protection against falling dirt, rain, sleet,
snow, windblown dust, splashing water, hose-
directed water, corrosion, and damage from
external ice formation) when installed with an
ASK75.7U Weather Shield and outdoor-rated
conduit fittings. This weather shield may be
mounted in any orientation.
For dimensions, see Figure 22.
985-094P10
Position indicators (10/pkg.)
985-092
Anti-rotation (mounting) bracket.
Figure 7. Miscellaneous Service Parts.
GEB16x
Apply a 0 (2) to 10 Vdc control signal between wire 8 (Y) and wire 2 (G0) to operate the
damper actuator. The angle of rotation is proportional to the control signal. A 0 to 10 Vdc
position feedback output signal is available between wire 9 (U) and wire 2 (G0) to monitor the
position of the damper motor.
In the event of a power failure, the actuator holds its position. In the event that only the control
signal is lost, the actuator returns to the "0" position.
GEB14x
A floating control signal controls the damper actuator. The actuator’s angle of rotation is
proportional to the length of time the signal is applied. A 24 Vac control signal to wire 6 (Y1)
causes the actuator coupling to rotate clockwise. A 24 Vac control signal to wire 7 (Y2)
causes the actuator coupling to rotate counterclockwise.
To reverse the direction of rotation, wires 6 (Y1) and 7 (Y2) can be interchanged.
With no control voltage, the damper actuator holds its position.
In the event of a blockage in the damper, the actuator is overload protected over the full range
to prevent damage to the actuator.
An improperly tuned loop will cause excessive repositioning that will shorten the life of the
actuator.
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