OpenAir GEB Non-Spring Return, 24 Vac, 132 lb-in, Rotary Electronic Damper Actuators
Technical Instructions
Document Number 155-318P25
May 19, 2014
Siemens Industry, Inc.
Page 7
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
Area
Damper
Rating
Torque
1
×
1
Safety Factor: When calculating the total torque 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.
4. Select the non-spring return actuator type using Table 2.
Table 2.
Total Torque
Actuator
<44lb-in
(5Nm)
GDE
>44lb-in <88lb-in
(>5Nm <10Nm)
GLB
>88lb-in <132lb-in
(>10Nm <15Nm)
GEB
>132lb-in <177lb-in
(>15Nm <20 Nm)
GBB
>177lb-in <310lb-in
(>20Nm <35Nm)
GIB
>310lb-in <620lb-in
(>35Nm <70Nm)
Use tandem-mounting bracket ASK73.2U with any combination of
GIB161 AND GIB166 actuators or use Master/Slave Actuators.
See
OpenAir™ Electronic Damper ActuatorsTechnical Instructions
(155-
542P25).
Mounting and
Installation
•
Place the actuator on the damper shaft so that the front of the actuator is accessible.
(The label and the manual override button are on the front side.)
•
The minimum damper drive shaft is 3/4-inches (20mm). The shaft length determines
whether the shaft adapter will be mounted on the front or back of the actuator.
•
Refer to Specifications for minimum and maximum damper shaft dimensions.
•
Set auxiliary switches, DIP switches, and Offset/Span as required by your
application. (See following sections for details.)
•
The position indicator can be mounted to show either the clockwise or
counterclockwise 0 to 90 scale.
•
A mounting bracket is included with the actuator.
•
The shaft adapter and mounting parts are shipped in a separate container with the
actuator.
•
The actuator is shipped from the factory with a 5° pre-load to ensure tight damper
close off.
•
Detailed mounting instructions are included with each actuator.
