OpenAir™ Technical Instructions Document No. 155-315P25 EA GMA March 6, 2018 GMA Series,Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Siemens Industry, Inc. Description The OpenAir direct-coupled spring return electronic actuator is designed for modulating, two-position, and floating control of building HVAC dampers. Features• Brushless DC motor technology with stall protection • Bi-directional fail-safe spring return • Models available with dual, independently adjustable auxiliary switches • Unique self-centering shaft coupling • Manual override • Available in 62 lb-in torque • 5° preload as shipped from factory • Mechanical range adjustment capabilities • UL and cUL listed, CE certified • 24 Vac/dc compatible Application Used in constant or variable air volume installations for the control of return air, mixed air, exhaust, and face and bypass dampers requiring up to 62 lb-in (7 Nm) torque. Designed for applications that require the damper to return to a fail-safe position when there is a power failure. Warning/Caution Notations WARNING: Personal injury or 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.Technical InstructionsOpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Document Number 155-315P25 March 6, 2018 Page 2Siemens Industry, Inc. Product Numbers Table 1. Product Number Operating Voltage ControlCables Built-In Control Options 2 4 V a c ± 2 0 % 2 4 V d c ± 1 5 % 1 2 0 V a c ± 1 0 % M o d u l a t i n g 0 t o 1 0 V d c M o d u l a t i n g 2 t o 1 0 V d c F l o a t i n g 2 - p o s i t i o n S t a n d a r d P l e n u m P o s i t i o n F e e d b a c k D u a l A u x i l i a r y S w i t c h e s O f f s e t 0 t o 5 V d c S p a n 2 t o 3 0 V d c I n p u t S i g n a l I n v e r s i o n ( D i r e c t o r I n v e r s e A c t i n g ) F e e d b a c k S i g n a l I n v e r s i o n GMA121.1U● ● ● GMA121.1P● ●● GMA121.1P/B ● ●● GMA126.1U● ● ● ● GMA126.1P● ●● ● GMA221.1U● ● ● GMA226.1U● ● ● ● GMA131.1U● ●● GMA131.1P● ●● GMA132.1U● ●● ● GMA136.1U● ●● ● GMA151.1U● ●● ●● ● GMA151.1P● ●● ●● ● GMA156.1U● ●● ● ●●● GMA156.1P● ●● ● ●●● GMA161.1U●●● ● GMA161.1P●●● ● GMA163.1U●●● ●● GMA163.1P●●● ●● GMA164.1U●●● ● ● ● GMA166.1U●●● ● ● GMA166.1P●●● ● ● Specifications Power Supply 24 Vac/24 Vdc Operating voltage24 Vac ± 20%; 24 Vdc ± 15% Frequency50/60 Hz Power consumption running (GMA 12x, 13x, 15x, 16x)5 VA/3.5W holding (GMA 12x, 13x, 15x, 16x)4 VA/3W Equipment ratingClass 2, in accordance with UL/CSA Class III per EN 60730 Power Supply 120 Vac Operating voltage120 Vac ± 10% Frequency50/60 Hz Power consumption running and holding (GMA 22x)7 VA/5WOpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper ActuatorsTechnical Instructions Document Number 155-315P25 March 6, 2018 Siemens Industry, Inc.Page 3 Control Signal Input signal (wires 8–2) voltage input signal GMA16x0 to 10 Vdc (max. 35 Vdc) voltage input signal GMA15x2 to 10 Vdc (max. 35 Vdc) input resistance>100K ohms Feedback Signal Position output signal (wires 9–2) voltage output signal GMA16x0 to 10 Vdc voltage output signal GMA15x2 to 10 Vdc maximum output current+1 mA, -0.5 mA Function Running/spring return torque62 lb-in (7 Nm) Maximum torque186 lb-in (21 Nm) Runtime for 90° operating with motor90 seconds closing (on power loss) with spring return 15 seconds typical (60 seconds max. at -25°F [-32°C]) Mounting Nominal angle of rotation90° Maximum angular rotation95° Shaft size1/4 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 length3/4-inch (20 mm) Housing EnclosureNEMA 1 IP54 according to EN 60 529 (limited positions; seeOpenAir™ GMA Series Installation Instructions (129-307) MaterialDie-cast aluminum alloy Gear lubricationSilicone-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 UL listed to UL60730 (to replace UL873) cUL certified to Canadian Standard C22.2 No. 24-93 Australian Electromagnetic Compatibility (EMC) per AS/NZS 4251.1/2:1999 (C-tick) Conformity Low voltage directive (LVD)2006/95/EC EN 60 730-2-14 (Type 1) Electromagnetic compatibility (EMC)2004/108/EC Immunity for all models, except GMA132.xxEN61000-6-2 Immunity for GMA132.xxEN61000-6-1 Emissions for all modelsEN61000-6-3Technical InstructionsOpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Document Number 155-315P25 March 6, 2018 Page 4Siemens Industry, Inc. Auxiliary Features Control signal adjustment Offset (start point)Between 0 to 5 Vdc SpanBetween 2 to 30 Vdc Dual auxiliary switches AC rating (standard cable)24 to 250 Vac AC 6A resistive AC 2A general purpose AC rating (Plenum cable)24 Vac AC 4A resistive AC 2A general purpose DC rating (Standard/Plenum cable)12 to 30 Vdc DC 2A Switch Range Switch A0° to 90° with 5° intervals Recommended range usage0° to 45° Factory setting5° Switch B0° to 90° with 5° intervals Recommended range usage45° to 90° Factory setting85° Switching hysteresis2° WARNING: Apply only AC-line voltage from the same phase 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. NOTE:With plenum cables, only UL-Class 2 voltage (SELV for CE) is permitted. Feedback potentiometer(GMA 132.1U) Sliding contact (P2)0 to 1000 ohm <10 mA Load<1W VoltageUL-Class 2 (SELV/PELV for CE) <24 Vac/dc Miscellaneous Pre-cabled connection18 AWG (0.75 mm 2 ) Cable length3 feet (0.9 m) length Noise level40 dBA Life cycleDesigned for over 60,000 full stroke cycles and a minimum of 1.5 million repositions at rated torque and temperature Dimensions8-3/8-in. H × 3-1/4-in. W × 2-2/3-in. D (212 mm H × 83 mm W × 68 mm D) Weight2.9 lbs (1.3 kg) Country of OriginUSAOpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper ActuatorsTechnical Instructions Document Number 155-315P25 March 6, 2018 Siemens Industry, Inc.Page 5 Actuator Components Figure 1. Components of the GMA Spring Return Actuator. Legend 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. Manual override wrench opening and direction of rotation arrow 11. Auxiliary switches A and B 12. Position indicator 13. Self-centering shaft adapter 14. Shaft adapter locking clip 15. Position indicator adapter 16. Key for manual adjustment 17. Adjustment tool for: auxiliary switches (11), offset/span (4 and 5), and lock pin (9) 18. 1/2-inch NSPT conduit connections 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). Figure 2. Floor/Frame Mount Kit. 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. Kit contains: • Crank arm to change the angular rotation into a linear stroke. • Support bearing ring to minimize side loading on the actuator’s output bearing. • Mounting bracket, and required mounting fasteners.Technical InstructionsOpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Document Number 155-315P25 March 6, 2018 Page 6Siemens Industry, Inc. Accessories, Continued 4 6 1 4 Z 1 6 Figure 3. Rotary to Linear Crank Arm Kit. 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 adapter. • Mounting fasteners. Figure 4. Rotary to Linear Crank Arm Kit with Mounting Bracket. 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: • Crank arm to attach to the splined hub of the shaft adapter. • Mounting bracket, and other required mounting fasteners. Figure 5. NEMA 3R Weather Shield. ASK75.3U: GMA 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. See Figure 20 for dimensions. Figure 6. NEMA Type 4X Weather Shield. ASK75.7U:GMA 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 21.OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper ActuatorsTechnical Instructions Document Number 155-315P25 March 6, 2018 Siemens Industry, Inc.Page 7 Accessories, Continued Figure 7. Heater/Weather Shield Assembly. 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 Service Parts 985-094P10 Position indicators (10/pkg.) 985-093 Standard shaft adapter. 985-098 Adjustment Tool. 985-092 Anti-rotation (mounting) bracket. 985-124 499-ohm resistor assembly kit for 4 to 20 mA applications. Figure8. GMA Series Service Parts. OperationGMA16x, GMA15x Apply a continuous 0 to 10 Vdc, or 2 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 or 2 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 or when the operating voltage is shut off, the actuator returns to the "0" position. GMA12x and GMA 22x When power is applied, the actuator coupling moves toward the open position "90°". In the event of a power failure or when the operating voltage is shut off, the actuator returns to the "0" position. GMA13x 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/dc control signal to wire 6 (Y1) causes the actuator coupling to rotate clockwise. A 24 Vac/dc control signal to wire 7 (Y2) causes the actuator coupling to rotate counterclockwise. With no control voltage, the damper actuator holds its position. In the event of a power failure, the actuator spring returns to the "0" position.Technical InstructionsOpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Document Number 155-315P25 March 6, 2018 Page 8Siemens Industry, Inc. 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: 1. Obtain damper torque ratings (lb-in/ft 2 or Nm/m 2 ) from the damper manufacturer. 2. Determine the area of the damper. 3. Calculate the total torque required to move the damper: Total Torque = SF AreaDamperRatingTorque 1 × 4. Select a spring return actuator using Table 2. 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. NOTE:Mechanically coupled actuators must be of the exact same type except for the dual auxiliary switches and feedback potentiometer options. Use the correct mounting bracket. See Table 2. Table 2. DC Power (24 Vdc)AC Power (24 Vac, 120 Vac) Total TorqueActuatorTotal TorqueActuator <62 lb-in (7 Nm) GMA1xx <62 lb-in (7 Nm) GMA >62 lb-in <160 lb-in (>7 Nm <18 Nm) GCA12x, GCA13x, GCA15x* >62 lb-in <160 lb-in (>7 Nm <18 Nm) GCA >160 lb-in <320 lb-in (>18 Nm <36 Nm) Use tandem mounting bracket ASK73.1 with any combination of: • GCA12x actuators • GCA13x actuators Use tandem mounting bracket ASK73.2U with any combination of GCA151 and GCA156 actuators.* >160 lb-in <320 lb-in (>18 Nm <36 Nm) Use tandem mounting bracket ASK73.1 with any combination of: • GCA12x actuators • GCA22x actuators • GCA13x actuators • Use tandem mounting bracket ASK73.2U with any combination of: • GCA151 and GCA156 actuators* • GCA161 and GCA166 actuatorsOpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper ActuatorsTechnical Instructions Document Number 155-315P25 March 6, 2018 Siemens Industry, Inc.Page 9 Mounting and Installation 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. • The shaft adapter and the position indicator can be mounted on either side of the actuator. The actuator mounting orientation and shaft length determine how they will be mounted on the actuator. • The minimum damper drive shaft length is 3/4-inch (20 mm). • SeeSpecifications for the minimum and maximum damper shaft dimensions. • The actuator is shipped from the factory with a 5° preload enabling tight close off of the damper in power-fail- close applications. • 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.Next >