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Siemens OpenAir GCA Series Technical Instructions
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Siemens OpenAir GCA Series Technical Instructions

Siemens OpenAir GCA Series Technical Instructions

Electronic damper actuators
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OpenAir™
GCA Series Spring Return 160 lb-in
Electronic Damper Actuators
Description
The OpenAir 24 Vac/dc spring return 160 lb-in (18 Nm) electronic actuator is designed for
digital or analog control of building HVAC dampers.
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Features
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Application
These actuators are designed for use in constant or variable air volume installations for the
control of return air, mixed air, exhaust, and face and bypass dampers requiring up to
160 lb-in (18 Nm) torque. They are designed for applications that require the damper to
return to a fail-safe position when there is a power failure.
Brushless DC motor technology with stall protection
Bi-directional fail-safe spring return
Patented self-centering shaft coupling
Manual override
160 lb-in (18 Nm) torque
5° preload as shipped from factory
Offset and span adjustment models available
Models with independently adjustable dual auxiliary switches available
UL and cUL listed;
certified
Technical Instructions
Document No. 155-173P25
Siemens Industry, Inc.
EA GCA-1
May 19, 2014

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Summary of Contents for Siemens OpenAir GCA Series

  • Page 1 160 lb-in (18 Nm) torque. They are designed for applications that require the damper to return to a fail-safe position when there is a power failure. Siemens Industry, Inc.

  • Page 2: Product Numbers

    ● ● GCA166.1P Warning/Caution Notations WARNING: Personal injury/loss of life may occur if you do not perform a procedure as specified. CAUTION: Equipment damage may occur if you do not perform a procedure as specified. Page 2 Siemens Industry, Inc.

  • Page 3: Specifications

    Runtime for 90° operating with motor 90 sec closing (on power loss) with spring return 15 seconds typical NOTE: At -25°F, spring return is 142 lb-in (16 Nm Equipment rating Class 2, in accordance with UL/CSA Siemens Industry, Inc. Page 3...
  • Page 4 90° See Figure 17. NEMA 3R rated when installed with ASK75.1U Weather Shield in the vertical position. See Figure 18. See Accessories, Figure 9. Material Die-cast aluminum alloy Gear lubrication Silicone-free Page 4 Siemens Industry, Inc.

  • Page 5: Actuator Components

    11. Shaft adapter locking clip 12. Position indicator adapter 13. Mounting bracket Figure 1. Modulating GCA Actuator. 14. Connection cables NOTE: Not all features are on all models. Table 1 for a listing of features per model. Siemens Industry, Inc. Page 5...
  • Page 6 OpenAir actuators to directly drive a single damper shaft. Tandem mounting bracket for two GCA 2-position and floating control actuators mounted on the same side of the damper shaft. Figure 6. Tandem Mount Bracket. Page 6 Siemens Industry, Inc.
  • Page 7 ASK75.7U Weather Shield and outdoor-rated conduit fittings. This weather shield may be mounted in any orientation. Figure 10. NEMA Type 4X For dimensions, see Figure 30. Weather Shield. Siemens Industry, Inc. Page 7...

  • Page 8: Service Parts

    The angle of rotation is proportional (or inverse proportional) to the control signal. A 0 to 10 Vdc, or 2 to 10 Vdc position feedback output signal is available between wires U and G0 (system neutral) to monitor the position of the damper actuator. Page 8 Siemens Industry, Inc.
  • Page 9 Figure 14. 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 value of ∆U: − − min) ∆ Working angle rotation Siemens Industry, Inc. Page 9...
  • Page 10 For GCA15x actuators with signal inversion switch set to Inverse Acting, 90° corresponds to either a 0 to 10 Vdc or a 2 to 10 Vdc. Vdc input signal depends on the input signal selection. Page 10 Siemens Industry, Inc.
  • Page 11 GCA15x Series Actuator with Master/Slave mode operation selected. See Figure 22 for master/slave DIP switch settings, and Figure 27 for wiring of this configuration. *Tandem application tested for up to four actuators. Each bracket mounts two actuators. Siemens Industry, Inc. Page 11...

  • Page 12: Mounting And Installation

    • A mounting bracket is included with the actuator. • The shaft adapter and mounting parts are shipped in a separate container with the actuator. • See the detailed mounting instructions included with each actuator. Page 12 Siemens Industry, Inc.
  • Page 13 Flip the actuator to select either clockwise or counterclockwise fail-safe rotation of the damper shaft. Follow steps 1, 2, and 3 of Table 3 to determine the correct actuator mounting orientation. Table 3. Actuator Mounting Orientation and Damper Control. Siemens Industry, Inc. Page 13...

  • Page 14: Manual Override

    Rotate the damper blade shaft to its failed position. Rotate the shaft coupling to the Adjustment desired position. Insert the shaft adapter into the actuator and fasten it with the locking clip. See Figure 20. Figure 20. Mechanical Range Adjustment. Page 14 Siemens Industry, Inc.
  • Page 15 (ESD) at levels of 2kV and above. The position output signal U is not influenced by the self-adapt function. The 0 to 10V feedback signal U is always proportional to 0° to 90° (or 90° to 0°). Siemens Industry, Inc. Page 15...
  • Page 16 • The Output Signal 9 (pink) wire, identified as the Master actuator, needs to be connected to all the Control Signal Wires 8 (gray) of the slave actuators used in the tandem application. Page 16 Siemens Industry, Inc.
  • Page 17 Each wire has the standard symbol printed on it. See Table 4. Figure 23. GCA15x, GCA16x, Modulating Control. Figure 24. GCA12x, 2-Position Control. Figure 25. GCA13x, Floating Control. Figure 26. GCA22x, 2-Position Control. Figure 27. GCA15x.1x for Tandem Application (Master/Slave). Siemens Industry, Inc. Page 17...
  • Page 18 Connect wires S1 and S2 to the DMM. The DMM should indicate open circuit or no resistance. e. Switch off Vac power. The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A. Page 18 Siemens Industry, Inc.
  • Page 19 Connect wires S1 and S2 to the DMM. The DMM should indicate an open circuit or no resistance. Apply a control signal (24 Vac/dc) to wire 7 (orange). The DMM should indicate contact closure as the actuator actuator-shaft coupling reaches the setting of switch A. Siemens Industry, Inc. Page 19...
  • Page 20 Apply the input signal as in Step 1f, to wire 8 (gray). The reading at the DMM should decrease (increase for GCA15x in inverse acting mode) and the actuator shaft coupling returns to the fail "0" position. Page 20 Siemens Industry, Inc.

  • Page 21: Special Application

    985-124 is provided with the GCA15x actuator. Figure 28. Wiring Diagram for Converting 4 to 20 mA into 2 to 10 Vdc. Service WARNING: Do not open the actuator. If the actuator is inoperative, replace the unit. Siemens Industry, Inc. Page 21...

  • Page 22: Troubleshooting

    The actuator should resume normal operating mode. Dimensions Figure 29. Dimensions of the ASK75.1U Weather Shield in Inches (Millimeters). Figure 30. Dimensions of the ASK75.7U Weather Shield in Inches (Millimeters). Page 22 Siemens Industry, Inc.
  • Page 23 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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