t.a.c. MS-83010 Series General Instructions Manual page 3

Mounting Tips
1. Select a convenient position to mount the damper actuator
that will provide the desired normal position of the damper,
see Figure 3.
2. The damper should be linked for angular rotation of less
than 90° that will provide the required flow. This will
provide the optimum close-off and controllability.
Typically 60° rotation of the damper will provide almost
maximum flow.
3. Damper rod that is too long is not rigid enough for good
control and damper rod that is too short makes it difficult
to adjust the linkage.
4. The best position for the actuator is with the actuator
crank arm and the damper crank arm at 90° angle to the
damper push rod when actuator is in mid-stroke, see
Figure 3.
Figure-2 Dimensions for MS-8304X Series.
Mounting Instructions (Refer to Figure 3)
1. Hold the actuator up to the duct in an appropriate position
and mark the four (4) mounting hole positions.
2. With an appropriate drill or punch, pierce the mounting
holes marked in step1.
3. Using four (4) screws or bolts (not provided) mount the
actuator to the duct.
4. Attach a ball joint to the slot in the damper crank arm at a
position from the centerline of the shaft hole in the crank
arm; position equal approximately 1-1/2" (38.1 mm) for
90° damper rotation and 2" (50.8 mm) for 60° damper
rotation.
5. Rotate the damper to its normal position. Attach and
secure the damper crank arm to the damper shaft at an
angle (30° for 60° rotation damper and 45° for 90° rotation
damper) from the mid-stroke position of the crank arm
and pointing toward the actuator.
6. Slide the damper rod through the ball joint on the damper
crank arm and into the connector on the actuator. Tighten
the nut on the connector on the actuator. Cut off
excessive damper rod.
F-19449-5
Figure-3 Typical Mounting for MS-8304X Series.
For normally open dampers , tighten the nut on the ball
joint. When the damper is closed the actuator should be
1/16" (1.6 mm) from the extend end of stroke (verify in
step 8).
For normally closed dampers , push the damper closed
using the crank arm and tighten the nut on the ball joint
while holding the damper closed. This adjustment should
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