Installation Instructions

Document No. 129-404
Installation Instructions
April 13, 2020
Siemens Industry, Inc. Page 5 of 7
Figure 12. Tandem Mounting on Each End
of Damper Shaft.
References
OpenAir™ Spring Return Electric Damper Actuator Modulating
Control Technical Instructions (155-173P25).
OpenAir™ Weather Shield Kits Installation Instructions
(129-261).
Wiring
• All wiring must conform to NEC and local codes and
regulations.
• Use earth ground isolating step-down Class 2
transformers. Do not use autotransformers.
NOTE: 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. It is recommended that not more than
80% of the transformer VA be utilized. The
GCA actuator consumes 8 VA or less.
CAUTION:
Mixed switch operation to the switching
outputs of both auxiliary switches (A and B)
is not permitted.
Either AC line voltage from the same phase
must be applied to all six outputs of the dual
auxiliary switches, or UL-Class 2 voltage
must be applied to all six outputs.
NOTE: With Plenum cables, only UL-Class
2 voltage is permitted.
Actuator
Operating
Voltage
Power
Consumption
Modulating Control
GCA16x
24 Vac
7 VA/5W
GCA15x
24 Vac/dc
7 VA/5W
2-Position and Floating Control
GCA12x,
GCA13x
24 Vac/dc
7 VA/5W
GCA22x
120 Vac
8 VA
Wiring Diagrams
Modulating 0 to 10 Vdc Control, 24 Vac: GCA16x
Modulating 2 to 10 Vdc Control, 24 Vac/dc: GCA15x
2-position Control, 24 Vac/dc: GCA12x
Floating Control, 24 Vac/dc: GCA13x
2-position Control, 120 Vac: GCA22x
Special Application: Modulating 4 to 20 mA
Control with GCA15x and external 500 ohm
resistor