User Guide

Technical Instructions OpenAir™ Non-Spring Return Rotary Electric Damper Actuator
Document Number 155-187P25 24 Vac – Modulating Control
May 19, 2014
Page 10 Siemens Industry, Inc.
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 Aring 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, etc. A suggested safety
factor is 0.80 (or 80% of the rated torque).
4. Select the actuator type from Table 3.
Table 3.
Total Torque Actuator
<44 lb-in (5 Nm) GDE16x
<88 lb-in (10 Nm) GLB16x
<132 lb-in (15 Nm)
GEB16x
<221 lb-in (25 Nm) GBB16x
<310 lb-in (35 Nm) GIB16x
>310 lb-in >620 lb-in
(35 Nm – 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 33.
• 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 21. Damper Shaft Sizes.
NOTE: For all damper shafts with the exception of the 1/2-inch round shaft: Remove
1/2-inch Ø guide before installation.