Technical Instructions Document No. 155-315P25 EA GMA March 6, 2018 OpenAir™ GMA Series, Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Description The OpenAir direct-coupled spring return electronic actuator is designed for modulating, two-position, and floating control of building HVAC dampers.
Technical Instructions Document Number 155-315P25 March 6, 2018 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Product Numbers Table 1. Specifications Power Supply 24 Vac/24 Vdc Power Supply 120 Vac Page 2 ● GMA126.1U ● ● GMA126.1P ● ● Feedback Signal Inversion ● Input Signal Inversion (Direct or Inverse Acting) GMA121.1P/B Offset 0 to 5 Vdc Span 2 to 30 Vdc ● ● Dual Auxiliary Switches ● ● Position Feedback ● GMA121.1P Plenum Standard GMA121.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Control Signal Feedback Signal Function Mounting Housing Ambient Conditions Input signal (wires 8–2) voltage input signal GMA16x voltage input signal GMA15x input resistance Position output signal (wires 9–2) voltage output signal GMA16x voltage output signal GMA15x maximum output current Running/spring return torque Maximum torque Runtime for 90° operating with motor closing (on power loss) with spring return Nominal ang
Technical Instructions Document Number 155-315P25 March 6, 2018 Auxiliary Features OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Control signal adjustment Offset (start point) Span Dual auxiliary switches AC rating (standard cable) Between 0 to 5 Vdc Between 2 to 30 Vdc AC rating (Plenum cable) DC rating (Standard/Plenum cable) 24 to 250 Vac AC 6A resistive AC 2A general purpose 24 Vac AC 4A resistive AC 2A general purpose 12 to 30 Vdc DC 2A Switch Range Switch A Re
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions Document Number 155-315P25 March 6, 2018 Legend Actuator 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. Gear train lock pin 10.
Technical Instructions Document Number 155-315P25 March 6, 2018 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 hub of the shaft Figure 3. Rotary to Linear Crank adapter. Arm Kit. • Mounting fasteners. 4614Z16 Accessories, Continued OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators ASK71.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Accessories, Continued Technical Instructions Document Number 155-315P25 March 6, 2018 985-108: Provides protection for 24 Vac/dc OpenAir GMA1xx actuators down to temperatures of -58°F (-50°C). Assembly includes: • Weather Shield • Heater Kit Figure 7. Heater/Weather Shield Assembly. Service Parts 985-094P10 Position indicators (10/pkg.) 985-092 Anti-rotation (mounting) bracket. 985-093 Standard shaft adapter.
Technical Instructions Document Number 155-315P25 March 6, 2018 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators 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. Sizing The type of actuator required depends on several factors: 2 2 1.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Mounting and Installation Technical Instructions Document Number 155-315P25 March 6, 2018 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.
Technical Instructions Document Number 155-315P25 March 6, 2018 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Manual Override Rotating Locking in place Releasing when power is absent Figure 9. Manual Override. NOTE: Always turn the key in the direction of the arrow. CAUTION: When engaging the gear train lock pin, carefully turn only about 5 degrees until you meet slight resistance. Turning too far will strip the lock pin.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Control Signal Adjustment Technical Instructions Document Number 155-315P25 March 6, 2018 The offset (start point) and span of the control signal can be adjusted. The offset, Uo, can be adjusted between 0 to 5 Vdc. The span, ∆U, can be adjusted between 2 to 30 Vdc. (Offset and Span) GMA163 GMA164 Ys Yu Uo ∆U Mechanical positioning range (100% = angle of rotation 90°) Control signal Offset (start point) Span 1.
Technical Instructions Document Number 155-315P25 March 6, 2018 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Dual Auxiliary Switch Actuator rotary range with the shaft adapter mounted at position "0". GMA126 GMA226 GMA136 GMA156 GMA164 GMA166 Setting range for switches A and B Setting interval: 5° Switching hysteresis: 2° To change the settings of A and B: • Make sure the actuator is in the "0", failsafe position. The scale is valid only in the "0" position.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions Document Number 155-315P25 March 6, 2018 All wiring must conform to NEC and local codes and regulations. Wiring 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.
Technical Instructions Document Number 155-315P25 March 6, 2018 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Wiring Diagrams GMA12x 24 Vac/dc 2-Position Control Class 2 Figure 15. GMA22x 120 Vac 2-Position Control Figure 16. GMA13x 24 Vac/dc Floating Control Class 2 Figure 17. GMA15x GMA16x 24 Vac/dc Modulating control Class 2 Figure 18. Page 14 Siemens Industry, Inc.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions Document Number 155-315P25 March 6, 2018 Special Applications 4 to 20 mA GMA15x Figure 19. GMA 151 and GMA156, 4 to 20 mA Applications. Siemens Industry, Inc.
Technical Instructions Document Number 155-315P25 March 6, 2018 Start-Up/ Commissioning 1. OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Check Operation: a. Connect wires 1 (red) and 2 (black) to the 24 Vac/dc power supply. NOTE: With no input signal present, the GMA15x actuator with input signal inversion switch set to Inverse Acting will start driving towards 90°. GMA16x, GMA15x Spring Return Modulating Control 24 Vac/dc b.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Start-Up/ Commissioning, Continued 5. Technical Instructions Document Number 155-315P25 March 6, 2018 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 the input signal as in Step 1d, to wire 8 (gray).
Technical Instructions Document Number 155-315P25 March 6, 2018 Start-Up/ Commissioning, Continued GMA22x Spring Return 2-Position 120 Vac GMA13x Spring Return Floating 24 Vac/dc Page 18 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators WARNING: Switch off 120 Vac power before connecting wires 3 (black) and 4 (white). 1. Check Operation: a. Switch on 120 Vac power. Allow the actuator shaft coupling to rotate from 0 to 90°. b.
OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Start-Up/ Commissioning, Continued GMA13x Spring Return Floating 24 Vac/dc Technical Instructions Document Number 155-315P25 March 6, 2018 2. Check Spring Return: a. Apply a control signal (24 Vac/dc) to wire 6 (violet). Allow the actuator shaft coupling to rotate half way. b. Disconnect wire 1 (red). The spring returns the actuator shaft coupling to the fail "0" position. c. Connect wire 1 (red).
Technical Instructions Document Number 155-315P25 March 6, 2018 OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electric Damper Actuators 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 (For example, 120 Vac) when performing checks. • Check that the wires are connected correctly.
OpenAir Spring Return, GMA Series, 62 lb-in Rotary, Electronic Damper Actuators Technical Instructions Document Number 155-315P25 March 6, 2018 Dimensions, Continued Inches (mm) Figure 22. GMA Actuator and Mounting Bracket Dimensions. 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.
