OpenAir™ GCA Series Spring Return 160 lb-in Electronic Damper Actuator
Technical Instructions
Document No. 155-173P25
May 19, 2014
Siemens Industry, Inc.
Page 7
Accessories,
Continued
Figure 7. Tandem Mount
Bracket.
ASK73.2U:
Bracket provides an extended anti-
rotation pin allowing two OpenAir modulating
actuators to directly drive a single damper shaft.
Tandem mounting bracket for two GCA16x
(standard to 10 Vdc modulating control) Series
Actuators mounted on the same side of the
damper shaft.
NOTE:
For applications requiring single
damper shaft operation by up to four
GCA modulating control signal
actuators mounted on each side of
the damper shaft, use the GCA15x
Series Actuator with Master/Slave
mode operation selected.
Figure 8. Special Shaft Adapter.
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.
•
Shaft adapter is 13/16-inches (20 mm)
shorter than the height of the self-
centering shaft adapter.
Figure 9. NEMA 3R Weather
Shield.
ASK75.1U:
GCA 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 ASK75.1U Weather Shield and
outdoor-rated conduit fittings in the vertical
position.
For dimensions, see Figure 29.
Figure 10. NEMA Type 4X
Weather Shield.
ASK75.7U:
GCA 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 30.
