Data Sheet for Product

OpenAir
®
GQD Series, Spring Return, 20 lb-in, Rotary Electronic Damper Actuators Technical Instructions
Document Number 155-760
June 5, 2019
Siemens Industry, Inc. Page 5
Sizing
The type of actuator required depends on several factors:
1. Obtain damper torque ratings (lb-in/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
AreaDamper Rating Torque
1

4. Select a spring return actuator using Table 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.
Table 2. Sizing.
Total Torque
Actuator
20 lb-in (2Nm)
GQD
>35 lb-in  62 lb-in
(>4 Nm  7 Nm)
GMA
>62 lb-in  160 lb-in
(7 Nm  18 Nm)
GCA
>160 lb-in  320 lb-in
(>18 Nm  36 Nm)
Tandem GCA
ASK73.2U*: Tandem mounting bracket with any combination of GCA16x.
ASK73.1U*: Tandem mounting bracket for all other GCAx actuators.
*NOTE: Mechanically coupled actuators must be of the exact same type. Use the correct mounting bracket.
Mounting and
Installation
• The shaft adapter can be mounted on either side of the actuator. The actuator
mounting orientation and shaft length determine how they will be mounted on the
actuator.
• The minimum damper drive shaft length is 3/4-inch (20 mm).
• See Specifications for the minimum and maximum damper shaft dimensions.
• A mounting bracket is included with the actuator.
• See the detailed installation instructions included with each actuator.
Auxiliary Switches
Actuator
Position
Switch A
Common S1
Connected to
Switch B
Common S4
Connected to
0° to 5°
S3
S6
5° to 85°
S2
S6
85° to 90°
S2
S5