Install Instructions

Document No. 129-120
Installation Instructions
Rev. 5, January, 2002
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and
models as design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their
respective owners. © 2002 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
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Document No. 129-120
Printed in the U.S.A.
Page 4 of 4
Figure 6. Frame Mounting Dimensions.
Dimensions in Inches (Millimeters).
4. Attach rocker to blade in proper position for
normally open or normally closed damper
(Figure 6).
5. Attach mounting plate to mounting lug.
a. Normally closed damper: attach plate to lug
(Figure 7). Place pivot post in Hole 5.
Figure 7. No. 4 Actuator Frame Mounting,
Normally Closed Damper.
b. Normally open damper: attach plate to lug
(Figure 8). Place pivot post in Hole 6.
Figure 8. No. 4 Actuator Frame Mounting,
Normally Open Damper.
6. Fasten clevis to rocker. Discard crank and other
parts not used.
7. The actuator mounting plate has a tendency to
pivot at the point where the lug is welded to the
damper frame when the actuator strokes. It is
recommended that some means be devised in
the field to prevent this from happening. A
threaded rod attached to the mounting plate
and duct wall will normally work.
Hesitation Actuator Adjustment
Expected Installation Time:
15 minutes
1. To obtain an initial hesitation point, add air
pressure to actuator until shaft travels the
desired distance.
2. Turn locknuts on cycle adjustment rods until
they contact lower housing and then lock
together. Tighten cycle adjustment nuts evenly
to ensure smooth operation.
The installation is now complete.
References
AP 331-2 Powers™ Controls No. 4 Pneumatic
Damper Actuator Technical Instructions,
(155-032P25)
TB 181, Maximum Thrust Ratings of Pneumatic
Damper Actuators Technical Bulletin, (155-219P25)