OpenAir
™ GLB Enhanced Non-Spring Return Rotary Electronic Damper Actuator
Technical Instructions
Document Number 155-785
January 20, 2017
Siemens Industry, Inc.
Page 9
Sizing
The type of actuator required depends on several factors.
1. Obtain damper torque ratings (ft-lb/ft
2
or Nm/m
2
) from the damper
manufacturer.
2. Determine the area of the damper.
3. Calculate the total torque required to move the damper:
Total Torque =
SF
ea
Damper Ar
ing
Torque Rat
1
1
Safety Factor: When determining the torque of an actuator required,
a safety factor should be included for unaccountable variables such as
slight misalignments, aging of the damper, and so on. A suggested
safety factor is 0.80 (or 80% of the rated torque).
4. Select the non-spring return actuator type from Table 3.
Table 2.
Total Torque
Actuator
<44 lb-in (<5 Nm)
GDE
<88 lb-in (<10 Nm)
GLB
<132 lb-in (<15 Nm)
GEB
<221 lb-in (<25 Nm)
GBB
<310 lb-in (<35 Nm)
GIB
>310 lb-in >620 lb-in
(>35 Nm to >70 Nm)
Use tandem mounting bracket ASK73.1 with
any GIB1x actuator.
Mounting and
Installation
Place the actuator on the damper shaft so that the front of the actuator is
accessible. The label is on the front side. A mounting bracket is included with the
actuator.
The minimum damper drive shaft length is 3/4-inch (20 mm).
Observe the service envelope around the actuator as shown in Figure 28.
Detailed mounting instructions are included with each actuator.
1/2-inch Ø
Factory-Installed
Guide
3/8-inch Ø
Use the shaft insert supplied for any
3/8-inch (8 to 10mm) diameter shaft
5/8-inch Ø
Figure 15. Damper Shaft Sizes.
NOTE:
For all damper shafts with the exception of the 1/2-inch round shaft: Remove
the 1/2-inch Ø factory-installed guide before installation.
