Siemens OpenAir GCA Series Technical Instructions page 17

OpenAir™ GCA Series Spring Return 160 lb-in Electronic Damper Actuator
Wire Designations
Each wire has the standard symbol printed on it. See Table 4.
Figure 23. GCA15x, GCA16x, Modulating Control.
Figure 25. GCA13x, Floating Control.
Siemens Industry, Inc.
Figure 27. GCA15x.1x for Tandem Application (Master/Slave).
Figure 24. GCA12x, 2-Position Control.
Figure 26. GCA22x, 2-Position Control.
Technical Instructions
Document No. 155-173P25
May 19, 2014
Page 17