OpenAir Non-Spring Return Rotary Electric Damper Actuator
24 Vac – Modulating Control
For all damper shafts with the exception of the 1/2-inch round shaft: Remove 1/2 Ø inch guide
Siemens Building Technologies, Inc.
The type of actuator required depends on several factors.
1. Obtain damper torque ratings (ft-lb/ft
2. Determine the area of the damper.
3. Calculate the total torque required to move the damper:
Total Torque =
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.
<44 lb-in (5 Nm)
<88 lb-in (10 Nm)
<132 lb-in (15 Nm)
<177 lb-in (20 Nm)
<310 lb-in (35 Nm)
>310 lb-in >620 lb-in
(35 Nm – 70 Nm)
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
The minimum damper drive shaft length is 3/4-inch (20 mm).
Observe the service envelope around the actuator as shown in Figure 22.
Detailed mounting instructions are included with each actuator.
1/2 Ø inch
Use the shaft insert supplied for any
3/8-inch (8 to 10mm) diameter shaft
Figure 17. Damper Shaft Sizes.
(See Technical Instructions 155-542P2)
Use tandem mounting bracket ASK73.2U
with any combination of GIB16x actuators.
3/8 Ø inch
Document Number: 155-187P25
) from the damper
5/8 Ø inch
November 30, 2005