Damper Rotation Limiting; Mechanical Minimum Damper Position - Belimo AF24 US Manual

Rotation Limitation
The angle of rotation limiter, ZDB-AF2 US, is used in conjunction with the tab on
the universal clamp or IND-AF2 position indicator which comes with the ZDB-AF2
US. In order to function properly, the clamp or indicator must be mounted
correctly.
See Figure A.
The ZDB-AF2 US may not work in certain mounting orientations using the
ZG-106 or ZG-107 mounting brackets. It will not work with the ZG-108
mounting bracket. Limiting the damper rotation must be accomplished by
adjusting the crankarm linkage.
The ZDB-AF2 US may be used in 2 ways to control the rotational output of the
AF series actuator. One use is in the application where a damper has a
designed rotation less than 90°. An example would be a 45° or 60° rotating
damper. The other application would be to set a minimum damper position
which can be easily set or changed without having to remove the actuator from
the damper.

Damper Rotation Limiting

1. Determine the amount of damper rotation required.
2. Locate the Angle of Rotation Limiter (ZDB-AF2 US) on the actuator so that
its edge lines up with the degree graduation on the actuator face which
corresponds with the required rotation. See Figure C.
3. Find the appropriate cross-hair location through the slot of the limiter. This
is the screw mounting location.
4. Pierce through the label material to allow easy fastening of the retaining
screw.
5. Position the limiter back to the desired position, making sure the locating
"teeth" on the limiter are engaged into the locating holes on the actuator.
6. Fasten the limiter to the actuator using the self tapping screw provided.
7. Test the damper rotation either manually with the manual crank or apply
power and if required, a control signal. Re-adjust if necessary.

Mechanical Minimum Damper Position

In order to use this procedure, the actuator must be mounted for short shaft
mounting. See pages 8 & 10.
1. Position the damper to its minimum position by using the manual crank or
by providing the appropriate control signal to the AF24... modulating type
actuator.
2. Place the indicator on to the actuator spline in the approximate position
shown in Figure D. Fasten it with the retaining clip. Note that the mounting
orientation is different than the mounting used for Damper Rotation
Limiting.
3. Place the ZDB-AF2 US rotation limiter on the actuator so that it either makes
contact with, or is as close as possible to, the edge of the indicator. See
Figure E. Make sure that the locating teeth are engaged into the locating
holes on the actuator. If all of the mounting teeth do not align with the
holes, the mounting location of the indicator to the spline may have to be
moved. The limiter would then be remounted to get the best position match
of both parts.
4. Find the cross-hair location through the slot of the limiter. This is the screw
mounting location.
5. Pierce through the label material to allow easy fastening of the retaining
screw.
6. Fasten the limiter to the actuator using the self tapping screw provided.
7. Test the damper operation either manually with the manual crank or apply
power and if required, a control signal. Re-adjust if necessary.
This method should not be used for outside air damper applications. The
damper will never go to the full close-off position. This may cause coils to
freeze or other system problems. The AF24-SR (-S) US wired to either the
SGA24 or SGF24 can be used for minimum position setting and still provide full
close-off.
800-543-9038 USA
Screw secured at
these cross hairs
FIGURE C – ZDB-AF2 US, Securing the Angle of Rotation Limiter
30
CCW
FIGURE D
30
CCW
FIGURE E
866-805-7089 CANADA
Installation Instructions
Mechanical Installation
Secure angle-of-
rotation limiter
Philips screwdriver
Angle of rotation
is now set at 40 .
203-791-8396 LATIN AMERICA
Screw
CW
CW
37