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OpenAir™

Technical Instructions

Document No. 155-173P25

EA GCA-1

March 17, 2006

GCA Series Spring Return 142 lb-in

Electronic Damper Actuators

Siemens Building Technologies, Inc.

Description

The OpenAir 24 Vac/dc spring return 142 lb-in electronic actuator is designed for digital

or analog control of building HVAC dampers.

Features

• Brushless DC motor technology with stall protection

• Bi-directional fail-safe spring return

• Patented self-centering shaft coupling

• Manual override

• 142 lb-in (16 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

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 142 lb-in (16 Nm) torque. They are designed for applications that require the damper

to return to a fail-safe position when there is a power failure.

Summary of content (21 pages)

PAGE 1
Technical Instructions Document No. 155-173P25 EA GCA-1 March 17, 2006 OpenAir™ GCA Series Spring Return 142 lb-in Electronic Damper Actuators Description Features Application The OpenAir 24 Vac/dc spring return 142 lb-in electronic actuator is designed for digital or analog control of building HVAC dampers.
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Technical Instructions Document No. 155-173P25 March 17, 2006 OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Product Numbers Table 1. ● GCA126.1P ● ● ● ● ● GCA226.1U ● ● ● GCA131.1U ● ● ● GCA131.1P ● ● ● GCA132.1U ● ● ● GCA132.1P ● ● ● GCA136.1U ● ● ● GCA136.1P ● ● ● GCA151.1U ● ● ● GCA151.1P ● ● ● GCA156.1U ● ● ● GCA156.1P ● GCA161.1U ● ● ● GCA161.1P ● ● GCA163.1U ● GCA163.1P Offset 0 to 5 Vdc Span 2 to 30 Vdc GCA126.
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Technical Instructions Document No. 155-173P25 March 17, 2006 Specifications Ambient conditions Ambient temperature operation storage and transport Ambient humidity (non-condensing) -25°F to 130°F (-32°C to 55°C) -40°F to 158°F (-40°C to 70°C) 95% rh UL listed to UL60730 (to replace UL873) cUL certified to Canadian Standard C22.2 No.
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Technical Instructions Document No.
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Technical Instructions Document No. 155-173P25 March 17, 2006 Enclosure Specifications, continued NEMA 2 in vertical to horizontal 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.
PAGE 6
Technical Instructions Document No. 155-173P25 March 17, 2006 NOTE: The control signal adjustment cannot be added in the field. Order the product number that includes the option(s). EA0477R2 Accessories OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator (4 each) EA0476R2 Figure 2. Floor Mount Kit. EA0495R1 Figure 3. Frame Mount Kit. EA0494R1 Figure 4. Crank Arm Kit. Figure 5. Crank Arm Kit with Mounting Bracket. ASK71.1U: Allows foot mounting of OpenAir actuators.
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator EA0497R1 Accessories, Continued Figure 8. Special Shaft Adapter. Technical Instructions Document No. 155-173P25 March 17, 2006 ASK74.1U: Shaft adapter will attach to a 1.05-inch (26.6 mm) diameter shaft; the standard self-centering adapter will accept up to a one-inch (25.4 mm) diameter shaft. • Adapter can be used for coupling to slightly oversized one-inch (25.4 mm) jackshafts.
PAGE 8
Technical Instructions Document No. 155-173P25 March 17, 2006 OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Operation GCA12x and GCA22x: 2-Position Control When power is applied, the actuator coupling moves toward the open position 90°. GCA13x: 3-Position Control 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.
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Control Signal Adjustment Technical Instructions Document No. 155-173P25 March 17, 2006 GCA 163 and GCA164 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, ΔU, can be adjusted between 2 to 30 Vdc. YS (%) 100 1) 3) 2) Control Signals EA0411R1 2 Span, U 5 10 15 0 2 5 UO 10 35 YU (v) ΔU (max.
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Technical Instructions Document No. 155-173P25 March 17, 2006 Dual Auxiliary Switch OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator GCAxx4, GCAxx6 -5° 0° 10° 20° 30° 70° 80° 90° Actuator rotary range with the shaft adapter mounted at position "0". EA0413R2 Setting range for switches A and B 0° 10° 20° 30° 70° 80° A 90° Setting interval: 5° B Switching hysteresis: 2° To change the settings of A and B: 1. Make sure the actuator is in the "0", failsafe position.
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Technical Instructions Document No. 155-173P25 March 17, 2006 Table 2. Sizing Total Torque Actuator <62 lb-in (7 Nm) GMA >62 lb-in <142 lb-in (>7 Nm <16 Nm) GCA >142 lb-in <284 lb-in (>16 Nm <32 Nm) ASK73.2U*: Tandem mounting bracket with any combination of GCA16x. ASK73.1U*: Tandem mounting bracket for all other GCAx actuators. Used for tandem applications up to four actuators.
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Technical Instructions Document No. 155-173P25 March 17, 2006 OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator 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.
PAGE 13
OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Manual override Technical Instructions Document No. 155-173P25 March 17, 2006 90˚ 90˚ 90˚ 3 x 7-3/4 = 90˚ 2 Manual Override HOLD 1 Manual Override TRAIN GEAR PIN LOCK Manual Override 5 TRAIN GEAR PIN LOCK h EA0374R3 3 mm 6 7 8 TRAIN GEAR PIN LOCK 4 Rotating Locking in place Releasing when power is absent Figure 19. Manual Override. Always turn the key in the direction of the arrow.
PAGE 14
Technical Instructions Document No. 155-173P25 March 17, 2006 Wiring OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator 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 other components used.
PAGE 15
OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Technical Instructions Document No. 155-173P25 March 17, 2006 Wire Designations Each wire has the standard symbol printed on it. See Table 4. INPUT 8 OUTPUT 9 DUAL AUXILIARY SWITCHES SUPPLY 1 COMMON COMMON S1 S4 SWITCH A SWITCH B DUAL AUXILIARY SWITCHES COMMON COMMON S1 S4 SWITCH A M SWITCH B S2 1 2 S3 N.C. N.O. S5 S6 N.C. N.O. EA0864R1 EA0867R1 M SUPPLY NEUTRAL Figure 22. GCA15x, GCA16x, Modulating Control.
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Technical Instructions Document No. 155-173P25 March 17, 2006 OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuator Table 4. Wire Designations.
PAGE 17
OpenAir GCA Series Spring Return 142 lb-in Electric Damper Actuators Start-Up/ Commissioning GCA12x (24 Vac) GCA22x (120 Vac) Technical Instructions Document Number 155-173P25 March 17, 2006 1. Check Operation: a. Switch on 24 Vac/dc power (or 120 Vac GCA22x). b. Allow the actuator shaft coupling to rotate from 0 to 90°. c. Switch off 24 Vac/dc power (or 120 Vac GCA22x). The actuator shaft coupling will return to the "0" position. 2. Check Spring Return: a. Switch on 120 Vac power. b.
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Technical Instructions Document Number 155-173P25 March 17, 2006 Start-Up/ Commissioning, Continued — GCA13x 1. 2. 3. OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuators Check Operation: a. Connect wires 1 (red) and 2 (black) to 24 Vdc power supply. b. Apply a control signal (24 Vac/dc) to wire 6 (violet). c. Allow the actuator shaft coupling to rotate from 0 to 90°. d. Stop applying a control signal to wire 6 (violet). e.
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuators Start-Up/ Commissioning, Continued— GCA15x GCA16x 1. Technical Instructions Document Number 155-173P25 March 17, 2006 Check Operation: a. Connect wires 1 (red) and 2 (black) to the 24 Vac or 24 Vdc power supply. NOTE: With no input signal present, the GCA15x actuator with signal inversion switch set to Inverse Acting will start driving towards 90°. b.
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Technical Instructions Document Number 155-173P25 March 17, 2006 OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuators 5. Check the Auxiliary Switch B: Start-Up a. Set the DMM dial to ohms (resistance) or continuity check. Commissioning, GCA15X b. Connect wires S4 and S6 to the DMM. The DMM should indicate open circuit or no resistance. GCA16X c. Apply the input signal as in Step 1d, to wire 8 (gray).
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OpenAir GCA Series Spring Return 142 lb-in Electronic Damper Actuators Dimensions Technical Instructions Document Number 155-173P25 March 17, 2006 4-3/16 (106) OPENING FOR STANDARD 1/2" CONDUIT CONNECTOR (2) ∅ 1.04 (26.5) EA0846R1 8-1/4 (210) 15-3/8 (390) 1-3/8 (35) 4-1/16 (103) Figure 28. Dimensions of the ASK75.1U Weather Shield in Inches (Millimeters). min. 4 in. 100 mm 3-1/16 in. 78 mm MAX 3/4 in. 20 mm 1-1/8 in. 28 mm 11-13/16 in. 300 mm 3-3/8 in. 86 mm min. 8 in. min. 1/4 in.