Technical Instructions
OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014
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 19.
Service Parts
985-094P10
Position indicators (10/pkg.)
985-093
Standard shaft adapter
985-098
Adjustment Tool
985-092
Anti-rotation (mounting) bracket.
Figure 7. Miscellaneous Service Parts.
Operation
GEB16x
Apply a 0 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.
GEB13x
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.
Overload protection
In the event of a blockage in the damper, the actuator is overload protected over the full range
to prevent damage to the actuator.
Life expectancy
An improperly tuned loop will cause excessive repositioning that will shorten the life of the
actuator.
