Siemens OpenAir GCA Series - Service Parts; Operation

Technical Instructions OpenAir™ GCA Series Spring Return 160 lb-in Electronic Damper Actuator
Document No. 155-173P25
May 19, 2014
Page 8 Siemens Industry, Inc.
Figure 11. Heater/Weather
Shield Assembly.
985-106: Provides protection for GIB, GBB
and GCA OpenAir actuators down to
temperatures of -58°F
(-50°C). Assembly includes:
• Weather Shield
• Heater Kit
Figure 12.
499 Ohm Resistor Assembly Kit.
985-124: Used for converting a 4 to 20 mA
controller output signal into a 2 to 10 Vdc
actuator signal.
Service Parts
985-003
Position Indicators
(10/pkg.)
985-004
Standard Shaft Adapter.
985-006
Anti-rotation (Mounting)
Bracket.
985-008
Conduit Adapter,
1/2-inch (12 mm)
for 1/2-inch NPT
Connector.
Figure 13. Orderable Service Parts.
Operation
GCA12x and GCA22x: 2-Position Control
When power is applied, the actuator coupling moves toward the open position 90°.
GCA13x: Floating 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. A 24 Vac/dc control
signal to Y1 causes the actuator coupling to rotate clockwise. A 24 Vac/dc control
signal to Y2 causes the actuator coupling to rotate counterclockwise.
With no control voltage, the damper actuator holds its position.
GCA16x and GCA15x: Modulating Control
A continuous 0 to 10 Vdc or 2 to 10 Vdc signal from a controller to wire Y operates
the damper actuator. 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.