Mounting and Wiring VMA1200 Series Controllers Technical Bulletin
12
Setting the Damper Position
To set the damper position:
1.
Locate the damper position. The following figure shows
three possible icons on the end of the damper shaft.
damposit
Figure 5: Typical Damper Shaft End Icons
2.
Grasp the damper shaft firmly with a pliers and manually position
it to fully closed (icon perpendicular to airflow) for 90
°
boxes.
(Use the fully open position for 45
°
or 60
°
boxes.)
3.
For
90
°
boxes
, push the VMA gear release lever down and
position the actuator collar against its internal stop corresponding
to the fully closed position. This provides a hard stop for this
position. The hard stop for the open position is provided by the
VMA.
For
45
°
and 60
°
boxes
, push the VMA gear release down and
position the actuator to the fully open damper position. By
installing the VMA at the fully open position, the VMA provides
the open stop for 45° and 60° boxes. The closed damper seal
provides the fully closed stop.
Gear Release
Lever
Damper shaft is in
fully closed position.
Set Screw
Collar is rotated to its
fully closed position.
(CW to close in this example.)
Endstop
LON A
LON B
SHLD
Figure 6: Positioning the End Stop
