Technical Instructions

Document No. 155-318P25

EA GEB-1
May 19, 2014

OpenAir™
GEB Series Non-spring Return, 24
Vac, 132 lb-in Rotary Electronic
Damper Actuators

Description The OpenAir direct-coupled, 24 Vac, non-spring return electronic actuator is

designed for modulating and floating control of building HVAC dampers.

Features • Brushless motor technology with stall protection

• Unique self-centering shaft coupling
• Manual override
• 132 lb-in (15 Nm) torque
• 5° preload as shipped from factory
• Mechanical range adjustment capabilities
• Offset and span adjustment models available
• Models with independently adjustable, dual auxiliary switches available
• Built-in 1/2-inch conduit connection
• UL and cUL listed, CE certified

Application Used in constant or variable air volume installations for the control of HVAC dampers
requiring up to 132 lb-in (15 Nm) torque.

Warning/Caution Notations

WARNING: Personal injury/loss of life may occur if you do not follow a

procedure as specified.

Equipment damage may occur if you do not follow a

CAUTION:
procedure as specified.

Siemens Industry, Inc.

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

Product Numbers
Table 1.

Operating Built-in Control

Control Cable
Voltage Options

Modulating (0 to 10 Vdc)

Dual Auxiliary Switches

Input Signal Selectable

0 – 10 Vdc or 2-10 Vdc
Position Feedback

Offset and Span

Product
Number

24 Vac ±20%

Standard
Floating

Plenum
GEB131.1P ● – ● ● – – – – –
GEB131.1U ● – ● – ● – – – –
GEB132.1U ● – ● – ● ● – – –
GEB136.1U ● – ● – ● – ● – –
GEB161.1P ● ● – ● – ● – – ●
GEB161.1U ● ● – – ● ● – – ●
GEB164.1U ● ● – – ● ● ● ● –

Specifications Operating voltage 24 Vac ±20%

Frequency 50/60 Hz
Power Supply
Power consumption
24 Vac
Running:
GEB16x 5 VA/4W
GEB13x 3 VA/3W
Holding:
GEB 16x 1 VA/1W
Equipment rating Class 2, in accordance with UL/CSA
Class III per EN 60730
Control Signal Input signal (wires 8-2) GEB16x
Voltage-input 0 to 10 Vdc (max. 35 Vdc)
Input resistance >100K ohms
Feedback signal Position output signal (wires 9-2) GEB16x
Voltage-output 0 to 10 Vdc
Maximum output current ±1 mA
Function Running torque 132 lb-in (15 Nm)
Maximum torque 265 lb-in (30 Nm)
Runtime for 90° opening or closing
60 Hz 125 seconds
50 Hz 150 seconds
Nominal angle of rotation 90°
Maximum angular rotation 95°

Page 2 Siemens Industry, Inc.

OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

Mounting Shaft size 1/4 to 3/4-inch (6.4 to 20.5 mm) dia.

1/4 to 1/2-inch (6.4 to 13 mm) square
Minimum shaft length 3/4-inch (20 mm)
Housing Enclosure NEMA 1
IP54 according to EN 60 529
Material Die cast aluminum alloy
Gear lubrication Silicone free
Ambient conditions Ambient temperature
Operation -25°F to 130°F (-32°C to 55°C)
Storage and transport -40°F to 158°F (-40°C to 70°C)
Ambient humidity (non-condensing) 95% rh
Agency certification UL60730 (to replace UL873)
cUL certified to Canadian Standard
C22.2 No. 24-93
Conformity Low voltage directive 2006/95/EC
Product safety: Automatic electrical controls EN 60 730-2-14
for household and similar use (Type 1)

Electromagnetic compatibility (EMC) 2004/108/EC

Immunity for all models, except GEB132.xx EN61000-6-2
Immunity for GEB132.xx EN61000-6-1
Emissions for all models EN61000-6-3
Auxiliary features
Control signal adjustment
Offset (start point) Between 0 to 5V
Span Between 2 to 30V

Dual auxiliary switches

AC rating 24 to 250 Vac
AC 6A resistive,
AC 2A general purpose

DC rating 12 to 30 Vdc
DC 2A

Switch Range
Switch A 0 to 90° with 5° intervals
Recommended range usage 0 to 45°
Factory setting 5°
Switch B 0 to 90° with 5° intervals
Recommended range usage 45 to 90°
Factory setting 85°

Switching hysteresis 2°
Feedback potentiometer (GEB 132.1U) 0 to 1000 ohm <10 mA
Voltage UL-Class 2 (SELV/PELV for CE)

Siemens Industry, Inc. Page 3

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

Auxiliary features,
Continued WARNING:
Apply only AC line voltage or only UL-Class 2 voltage (SELV for CE conformance) to
the switching outputs of both auxiliary switches A and B. Mixed operation is not
permissible. See Wiring for details.

NOTE: With plenum cables, only UL-Class 2 (SELV for CE) is permitted).
Miscellaneous Pre-cabled connection 18 AWG
Cable length 3 feet (0.9m) length

Life cycle Designed for over 50,000 full strokes

at rated torque and temperature

Dimensions: Inches (mm) 8-3/8 H × 3-1/4 W × 2-2/3 D

(212 H × 83 W × 68 D)
Weight 2.2 lbs. (1 kg)
Country of Origin USA

Actuator Legend
Components
1. Actuator housing
2. Positioning scale for angle of
rotation
3. DIP switches and cover
4. Span adjustment
5. Offset (start point) adjustment
6. Mounting bracket
7. Connection cable for power
and control signals
8. Connection cable for auxiliary
switches or feedback
potentiometer
9. Manual override
10. Auxiliary switches A & B
11. Position indicator

Figure 1. Non-Spring Return Actuator 12. Self centering shaft adapter

Components. 13. 1/2-inch NSPT conduit
connection
14. Shaft adapter locking clip
15. Position indicator adapter

Page 4 Siemens Industry, Inc.

OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

Accessories NOTE: The auxiliary switches, control signal adjustment, and feedback potentiometer
cannot be added in the field. Order the product number that includes the option(s).

ASK71.11: For in-the-air-stream

applications: Anywhere a foot-mounted
actuator can be mounted. Can also be
directly mounted to a damper frame with
louvers and vents and in applications where
use of the floor mount is not possible.

4614Z19
Kit contains:
• Crank arm to change the angular
Figure 2. Floor /Frame Mount Kit. rotation into a linear stroke.
• Support bearing ring to minimize side
loading on the actuator’s output
bearing.
• Mounting bracket.
• Required mounting fasteners.

ASK71.13: Allows a direct-coupled actuator

to provide an auxiliary linear drive. Can be
used to simultaneously drive a set of
opposing or adjacent dampers with a single
actuator.
Kit contains:
• Crank arm to attach to the splined
4614Z16

hub of the shaft adapter.

Figure 3. Rotary to Linear Crank Arm Kit. • Mounting fasteners.

ASK71.14: Allows economical mounting of

an OpenAir actuator to a variety of surfaces.
Should be used in applications where the
actuator can be rigid-surface mounted and a
linear stroke output is required.
Kit contains:
4614Z18

• Crank arm to attach to the splined

Figure 4. Rotary to Linear Crank Arm Kit
hub of the shaft adapter.
with Mounting Bracket.
• Mounting bracket.
• Required mounting fasteners.

ASK75.3U: GEB actuators are UL listed to

meet NEMA 3R requirements (a degree of
protection against rain, sleet, snow, and
damage from external ice formation) when
installed with ASK75.3U Weather Shield and
outdoor-rated conduit fittings in the vertical
position.

Figure 5. NEMA 3RWeather Shield.

Siemens Industry, Inc. Page 5

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

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.

Figure 6. NEMA Type 4X For dimensions, see Figure 19.

Weather Shield.

Service Parts

985-094P10 985-093 985-098

Position indicators (10/pkg.) Standard shaft adapter 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.

Page 6 Siemens Industry, Inc.

OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

Sizing
The type of actuator required depends on several factors:
2 2
1. Obtain damper torque ratings (ft-lb/ft or Nm/m ) from the damper manufacturer.
2. Determine the area of the damper.
3. Calculate the total torque required to move the damper:

Torque Rating × Damper Area

Total Torque =
SF 1
1
Safety Factor: When calculating the total torque required, a safety factor should be included
for unaccountable variables such as slight misalignments, aging of the damper, etc. A
suggested safety factor is 0.80.

4. Select the non-spring return actuator type using Table 2.

Table 2.
Total Torque Actuator
<44lb-in (5Nm) GDE
>44lb-in <88lb-in (>5Nm <10Nm) GLB
>88lb-in <132lb-in (>10Nm <15Nm) GEB
>132lb-in <177lb-in (>15Nm <20 Nm) GBB
>177lb-in <310lb-in (>20Nm <35Nm) GIB
>310lb-in <620lb-in (>35Nm <70Nm) Use tandem-mounting bracket ASK73.2U with any combination of
GIB161 AND GIB166 actuators or use Master/Slave Actuators.
See OpenAir™ Electronic Damper ActuatorsTechnical Instructions (155-
542P25).
Mounting and • Place the actuator on the damper shaft so that the front of the actuator is accessible.
Installation (The label and the manual override button are on the front side.)
• The minimum damper drive shaft is 3/4-inches (20mm). The shaft length determines
whether the shaft adapter will be mounted on the front or back of the actuator.
• Refer to Specifications for minimum and maximum damper shaft dimensions.
• Set auxiliary switches, DIP switches, and Offset/Span as required by your
application. (See following sections for details.)
• The position indicator can be mounted to show either the clockwise or
counterclockwise 0 to 90 scale.
• A mounting bracket is included with the actuator.
• The shaft adapter and mounting parts are shipped in a separate container with the
actuator.
• The actuator is shipped from the factory with a 5° pre-load to ensure tight damper
close off.
• Detailed mounting instructions are included with each actuator.

Siemens Industry, Inc. Page 7

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

Manual Override To move the damper blades

and lock the position without
power present:

1. Hold down the PUSH

button.
2. Make adjustments to the
damper position.
3. Release the PUSH button.

Once power is restored, the

actuator returns to automated
control.
Figure 8. Manual Override.
Mechanical Range The angular rotation is adjustable between 0
and 90° at 5-degree intervals. The range of
Adjustment shaft movement is limited by mounting the shaft
adapter:
1. Loosen the shaft adapter from the damper
shaft and remove the actuator from the
damper shaft.
2. Remove the clip and shaft adapter from the
actuator.
Figure 9.

Figure 10. Figure 11 Figure 12.

3. Return the actuator gear train to the “0” position using the steps that follow for the
clockwise or counterclockwise damper shaft rotation.
Clockwise to open:
a. Insert the shaft adapter to the right as close as possible to the raised stop. See
Figure 10.
b. Hold down the PUSH button and rotate the shaft adapter to the left until it stops.
See Figure 11.
c. Release the PUSH button.
d. If the shaft adapter is not resting against the left raised stop, remove the adapter
and insert it against the left stop.
e. Place the position indicator to the “0” position on the outside scale.
See Figure 12.
Counterclockwise to open:
a. Insert the shaft adapter to the left as close as possible to the raised stop.
b. Hold down the PUSH button and rotate the shaft adapter to the right until it
stops.
c. Release the PUSH button.
d. If the shaft adapter is not resting against the right raised stop, remove the
adapter and insert it against the right stop.
e. Place the position indicator to “0” on the inside scale.
Page 8 Siemens Industry, Inc.
OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

4. Determine the angle of rotation for the damper blade shaft. Subtract that amount
from 90°.
5. Remove the shaft adapter and insert it with the position indicator pointing to the mark
on the scale calculated in the previous step. See Figure 12.
6. Attach the clip.
7. Rotate the damper blade shaft to its “0” position.
8. Return the actuator to the damper shaft and tighten the shaft adapter to the damper
shaft.
Control signal The offset (start point) and span of the control signal can be adjusted. The offset, Uo, can
adjustment be adjusted between 0 to 5 Vdc. The span, ∆U, can be adjusted between 2 to 30 Vdc.

GEB164.1U
(Offset and Span)

Factory setting:
Ys Mechanical positioning range (100% = angle of rotation 90°) 30V span
Yu Control signal 0 offset
Uo Offset (start point)
∆U Span
NOTE: When the mechanical limitation of the angle of rotation and
self-adaptive function are ON, 100% does not equal 90°.
1. Uo = 0V, ∆U = 2V: The minimum working range for
Ys = 100%
2. Uo = 5V, ∆U = 30V: The maximum working range for
Ys = 100%
3. Uo = 0V, ∆U = 30V: Factory setting

Figure 13. The Minimum and Maximum Control Signal Adjustment.

Example:
Open the actuator from 0 to 50% (45°) using a control signal of:
Umin= 2V to Umax= 10V.

Calculating the valve of ∆U:

100 [ %] (U max − U min) 100 x (10 − 2)

∆U = = = 16V
Working angle of rotation in % 50

Siemens Industry, Inc. Page 9

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

Control Signal Uo = 2; ∆U = 16V

Adjustment,
Continued Umin = minimum control signal
Umax = maximum control signal

Figure 14. Example.

Dual auxiliary switch ← Actuator scale: Clockwise
GEB164.1U,
GEB136.1U Adjustment range for switches A and B:
Setting interval: 5°
Switching hysteresis: 2°

← Actuator Scale: counterclockwise

To change the settings of A and B:

NOTE: The scale is only valid when the

actuator is in the "0" position on
clockwise motion.

• Use the adjustment tool provided

with the actuator to turn the
switch adjustment dials to the
desired signal setting.
Factory setting: Figure 15. Dual Auxiliary Switch Dials.
Switch A 5°
Switch B 85°
.
NOTE: Use the long arm of the "†" to point to the position of switch A. Use the
narrower tab on the red ring to point to the position of switch B.

DIP Switch
Functionality Description Label Description Function
GEB161
Counterclockwise Clockwise Rotary angle direction
GEB164
Self-adaptation to
Active 0 Off
mechanical range
GEB161: Positioning
2-10 Vdc 2-10 0-10 0…10 Vdc control signal
2-10 or 0-10
GEB164: Positioning
Offset 0-5V
signal. Turn on or off
Span 2-30V ADJ 0-10 0...10 Vdc
capability to adjust
offset/span.
Figure 16. DIP Switches.

Page 10 Siemens Industry, Inc.

OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

DIP Switch
Functionality,
Continued Rotary direction
• The arrow direction must match the rotational direction of
the actuator.
• Factory setting:

Self-adapting
• Alternative switch-on/off for self-adaptation.
0
: ON
0: OFF
• Factory setting: 0

CAUTION: When turning the self-adaptive feature on, or after a

software reset with the feature on, the actuator will
enter a five-minute calibration cycle as the actuator
adjusts to the rotation limits of the system.
A software reset happens after power on, or may be
caused by electrostatic discharge (ESD) at levels of
2kV and above.
Positioning Control Signal: (GEB161)
• Alternative settings:
2-10 0-10
2-10 Vdc
0-10 Vdc
• Factory setting: 0-10 Vdc

Positioning Control Signal: (GEB164)

• Alternative settings:
ADJ 0-10
ADJ: Allows offset/span adjustment capability

0-10V: Ignores offset/span capability and provides

0-10 Vdc input signal only
• Factory setting: ADJ

Wiring All wiring must conform to NEC and local codes and regulations.
Use earth ground isolating step-down Class 2 transformers. Do not use autotransformers.

The maximum rating for a Class 2 step-down transformer is 100 VA. Determine the supply transformer
rating by summing the VA ratings of all actuators and all other components used. It is recommended
that one transformer power no more than 10 actuators (or 80% of its VA).

WARNING:
Mixed switch operation is not permitted to the switching outputs of both auxiliary switches
(A and B).

Either all six outputs of the dual auxiliary switches must be connected to the AC line
voltage, or all six outputs must be connected to UL-Class 2 voltage (SELV for CE
conformance).

NOTE: With Plenum cables only UL-Class 2 voltage (SELV for CE conformance) is
permitted.

Siemens Industry, Inc. Page 11

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

WARNINGS:
Installations requiring Conformance:
• Except for the auxiliary switches (See Warning above) all wiring for actuators must
be safety extra-low voltage (SELV) or protective extra-low voltage (PELV) per
HD384.
• Use safety transformers per EN61558 with double isolation, designed for 100%
duty-cycle for supplying SELV or PELV circuits.
• Over-current protection for supply lines is maximum 10A.

CAUTION:
Do not parallel GEB13x actuators with any other type of actuator.

Wire Designations Each wire has the standard symbol printed on it. See Table 3.

Figure 17. Modulating 0 to 10 Vdc Control. Figure 18. Floating Control.

24 Vac Power Supply. 24 Vac Power Supply.
Table 3.
Terminal
Actuators Symbol Function Designations Color
1 Supply (SP) G Red
2 Neutral (SN) G0 Black

24 Vac 6 Control signal clockwise Y1 Violet

Power Supply 7 Control signal counterclockwise Y2 Orange
8 0 to 10 Vdc input signal Y Gray
9 Output for 0 to 10 Vdc position indication U Pink
S1 Switch A Common Q11 Gray/red
S2 Switch A N.C. Q12 Gray/blue
Auxiliary S3 Switch A N.O. Q14 Gray/pink
Switches S4 Switch B Common Q21 Black/red
S5 Switch B N.C. Q22 Black/blue
S6 Switch B N.O. Q24 Black/pink
P1 Feedback Potentiometer 0 to 100% P1 - P2 a White/red
Potentiometer P2 Feedback Potentiometer Common b White/blue
P3 Feedback Potentiometer 100 to 0% P3 - P2 c White/pink

Page 12 Siemens Industry, Inc.

OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

Start-Up/ 1. Check Operation:

a. Connect wires 1 (red) and 2 (black) to the 24 Vac power supply.
Commissioning
b. Set the Digital Multimeter (DMM) dial to Vdc for the actuator input signal.
c. Connect wires 2 (black) and 8 (gray) to a Digital Multimeter (DMM).
Non-spring Return
d. Apply a full-scale input signal (10 Vdc) to wire 8 (gray).
Modulating Control
(0-10 Vdc) e. Allow the actuator shaft coupling to rotate from 0 to 90°.
24 Vac
f. Stop the signal to wire 8 (gray).
The shaft coupling returns to the "0" position.
2. Check Feedback:
a. Set the DMM dial to Vdc.
b. Attach wires 2 (black) and 9 (pink) to the DMM.
c. Apply a full-scale input signal to wire 8 (gray).
The reading at the DMM should increase.
d. Remove the signal from wire 8 (gray).
The reading at the DMM should decrease and the actuator shaft coupling returns to the
“0” position.
3. Check the Auxiliary Switch A:
a. Set the DMM dial to ohms (resistance) or continuity check.
b. Connect wires S1 and S3 to the DMM.
The DMM should indicate open circuit or no resistance.
c. Apply a full-scale input signal to wire 8 (gray).
The DMM should indicate contact closure as the actuator shaft coupling reaches the
setting of switch A.
d. Connect wires S1 and S2 to the DMM.
The DMM should indicate open circuit or no resistance.
e. Stop the signal to wire 8 (gray).
The DMM should indicate contact closure as the actuator shaft coupling reaches the
setting of switch A.
4. Check the Auxiliary Switch B:
a. Set the DMM dial to ohms (resistance) or continuity check.
b. Connect wires S4 and S6 to the DMM.
The DMM should indicate open circuit or no resistance.
c. Apply a full-scale input signal to wire 8 (gray).
The DMM should indicate contact closure as the actuator shaft coupling reaches the
setting of switch B.
d. Connect wires S4 and S5 to the DMM.
The DMM should indicate open circuit or no resistance.
e. Stop the signal to wire 8 (gray).
The DMM should indicate contact closure as the actuator shaft coupling reaches the
setting of switch B.

Siemens Industry, Inc. Page 13

Technical Instructions OpenAir GEB Non-Spring Return, 24 Vac,132 lb-in, Rotary Electronic Damper Actuators
Document Number 155-318P25
May 19, 2014

Non-spring Return 1. Check Operation:

Floating a. Apply a control signal (24 Vac) to wires 1 (red) and 6 (violet).
24 Vac b. Allow the actuator shaft coupling to rotate from 0 to 90°.
c. Stop applying a control signal to wires 1 (red) and 6 (violet).
d. Apply a control signal (24 Vac) to wires 1 (red) and 7 (orange).
e. Allow the actuator shaft coupling to rotate from 90° to 0°.
2. Check Feedback:
a. Set the DMM dial to ohms.
b. Connect wires P1 and P2 to the DMM.
The DMM should indicate a resistive value.
c. Apply a control signal (24 Vac) to wires 1 (red) and 6 (violet).
The reading of the DMM should increase.
d. Stop applying a control signal to wires 1 (red) and 6 (violet).
e. Connect wires P2 and P3 to the DMM. The DMM should indicate a resistive value.
f. Apply a control signal (24 Vac) to wires 1 (red) and 7 (orange).
The reading of the DMM should increase.
3. Check the Auxiliary Switch A:
a. Set the DMM dial to ohms (resistance) or continuity check.
b. Connect wires S1 and S3 to the DMM.
The DMM should indicate an open circuit or no resistance.
c. Apply a control signal (24 Vac) to wires 1 (red) and 6 (violet).
The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of
switch A.
d. Stop applying a control signal to wires 1 (red) and 6 (violet).
e. Connect wires S1 and S2 to the DMM.
The DMM should indicate an open circuit or no resistance.
f. Apply a control signal (24 Vac) to wires 1 (red) and 7 (orange).
The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of
switch A.
4. Check the Auxiliary Switch B:
a. Set the DMM dial to ohms (resistance) or continuity check.
b. Connect wires S4 and S6 to the DMM.
The DMM should indicate an open circuit or no resistance.
c. Apply a control signal to wires 1 (red) and 6 (violet).
The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of
switch B.
d. Stop applying a control signal to wires 1 (red) and 6 (violet).
e. Connect wires S4 and S5 to the DMM.
The DMM should indicate an open circuit or no resistance.
f. Apply a control signal (24 Vac) to wires 1 (red) and 7 (orange).
DMM should indicate contact closure as the actuator shaft coupling reaches setting for
switch B.

Page 14 Siemens Industry, Inc.

OpenAir™ GEB Non-spring Return Rotary Electric Damper Actuators Technical Instructions
Document Number 155-318P25
May 19, 2014

Service WARNING:
Do not open the actuator.
If the actuator is inoperative, replace the unit.

Troubleshooting WARNING:
To avoid injury or loss of life, pay attention to any hazardous voltage
(Example: 120 Vac) when performing checks.

• Check that the wires are connected correctly.

• Check that auxiliary switches, DIP-switches, and Offset/Span are set correctly.
• Set the DMM dial to Vac and verify that the operating voltage is within range.
• If the actuator is not working, check the damper for blockage. If blocked,
remove the obstacle and cycle the actuator power off and on. The actuator
should resume normal operating mode.

Dimensions

Figure 19. Dimensions of the ASK75.7U Weather Shield in Inches (Millimeters).

Siemens Building Technologies, Inc. Page 15

Technical Instructions OpenAir™ GEB Non-spring Return Rotary Electric Damper Actuators
Document Number 155-318P25
May 19, 2014

Dimensions

Figure 20. Dimensions of the GEB Actuator and Mounting Bracket in inches (mm).

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. OpenAir is a trademark of Siemens Schweiz AG. Other product or company names mentioned herein may be
the trademarks of their respective owners. © 2014 Siemens Industry, Inc.
Siemens Industry, Inc. Your feedback is important to us. If you have Document No. 155-318P25
Building Technologies Division comments about this document, please send Printed in the USA
1000 Deerfield Parkway them to technical.editor@sbt.siemens.com Page 16
Buffalo Grove, IL 60089-4513
USA
+1 847-215-1000