Product Overview

Technical Instructions GBB/GIB Series NSR Rotary 24 Vac - Modulating Control
Document Number 155-176P25
December 15, 2004
Mounting and
Installation, continued
Tandem Applications
•
•
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 13 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).
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.
EA0360R1
PUSH
PUSH
1
3
2
PUSH
L > 3 in.
77mm
L < 3 in.
77mm
3
2
PUSH
Figure 20. 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.
EA0305R2
1
2
PUSH
Figure 21.
90
90
EA0648R1
PUSH
90
90
EA0649R1
PUSH
90
90
EA0650R1
PUSH
Figure 22. Figure 23. Figure 24.
Page 10 Siemens Building Technologies, Inc.