GBB/GIB Series Non-spring Return, 24 Vac, Modulating Control
Technical Instructions
Document Number 155-176P25
June 22, 2015
Siemens Industry, Inc.
Page 11
Mounting and
Installation, continued
•
The direction of rotation switches must be set identically on both actuators
according to the clockwise or counterclockwise rotation of the damper shaft.
The factory setting is clockwise. See Figure 14 for location on the actuators.
•
The tandem actuator pair is intended for use on the same mechanical load.
•
Minimum damper drive shaft length is 4-inches (100 mm).
Tandem Applications
CAUTION:
No more than three actuators are to be used in tandem applications.
Manual override
To move the damper blades when
power is not present:
1. Hold down the
PUSH
button.
2. Make adjustments to the damper
position.
3. Release the
PUSH
button.
NOTE:
If there is no load, the
actuator will hold the new
damper position. If load
conditions exist, the actuator
might not be able to hold.
Once power is restored, the actuator
returns to automated control.
Figure 21. Manual Override.
Mechanical Range
Adjustment
The angular rotation is adjustable
between 0 and 90° at 5-degree
intervals. The range of shaft
movement is limited by mounting the
shaft adapter:
1. Loosen the shaft adapter from the
damper shaft and remove the
actuator from the damper shaft.
2. Remove the clip and shaft adapter
from the actuator.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
