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Siemens OpenAir GEB Series Technical Instructions

Non-spring return, 24 vac, 132 lb-in rotary electronic damper actuators
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GEB Series Non-spring Return, 24
Vac, 132 lb-in Rotary Electronic
Damper Actuators
Warning/Caution Notations
The OpenAir direct-coupled, 24 Vac, non-spring return electronic actuator is
designed for modulating and floating control of building HVAC dampers.
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
Used in constant or variable air volume installations for the control of HVAC dampers
requiring up to 132 lb-in (15 Nm) torque.
Technical Instructions
Document No. 155-318P25
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
procedure as specified.
May 19, 2014
Siemens Industry, Inc.


Table of Contents

Summary of Contents for Siemens OpenAir GEB Series

  • Page 1 132 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.
  • Page 2: Product Numbers

    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.
  • Page 3 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...
  • Page 4: Actuator Components

    9. Manual override 10. Auxiliary switches A & B 11. Position indicator 12. Self centering shaft adapter Figure 1. Non-Spring Return Actuator Components. 13. 1/2-inch NSPT conduit connection 14. Shaft adapter locking clip 15. Position indicator adapter Page 4 Siemens Industry, Inc.
  • Page 5 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...
  • Page 6: Service Parts

    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.
  • Page 7: Mounting And Installation

    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...
  • Page 8 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.
  • Page 9 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: − − min) ∆ Working angle rotation Siemens Industry, Inc. Page 9...
  • Page 10: Dip Switch Functionality

    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 0-10 0...10 Vdc capability to adjust offset/span. Figure 16. DIP Switches. Page 10 Siemens Industry, Inc.
  • Page 11 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). With Plenum cables only UL-Class 2 voltage (SELV for CE conformance) is NOTE: permitted. Siemens Industry, Inc. Page 11...
  • Page 12 Switch B Common Black/red Switch B N.C. Black/blue Switch B N.O. Black/pink Feedback Potentiometer 0 to 100% P1 - P2 a White/red Potentiometer Feedback Potentiometer Common White/blue Feedback Potentiometer 100 to 0% P3 - P2 c White/pink Page 12 Siemens Industry, Inc.
  • Page 13 Connect wires S4 and S5 to the DMM. The DMM should indicate open circuit or no resistance. 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...
  • Page 14 The DMM should indicate an open circuit or no resistance. 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.
  • Page 15: Troubleshooting

    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...
  • Page 16 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.

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