M9220-GGx-3 Proportional Electric Spring Return Actuators Installation Guide
7
Note:
You can bend the anti-rotation bracket to fit
a round damper.
3. Drill mounting holes in the damper frame or duct
using the anti-rotation bracket as a guide (based
on the measurements obtained in Table 2 and
Figure 5).
4. Secure the anti-rotation bracket to the damper
frame or duct using the two M3 x 9.5 mm
self-drilling sheet metal screws provided and a
1/4 in. (6 mm) blade screwdriver or 5/16 in. (8 mm)
nut driver.
5. Slide the actuator onto the damper shaft, and
position the tab of the anti-rotation bracket into the
slot at the bottom of the actuator as illustrated in
Figure 6.
6. Rotate the damper blades to the desired position if
the power is lost. To ensure a tight seal, insert the
manual override crank and turn it in the direction
indicated by the arrow on the label five turns; the
position indicator should be near the 0° position on
the scale. Quickly rotate the manual override crank
a half turn in the opposite direction to temporarily
lock the actuator hub in place.
7. Evenly hand tighten each clamp nut onto the
U-bolt, keeping the actuator flat. Secure the U-bolt
to the damper shaft and tighten to a torque of 100
to 125 lb·in (11 to 14 N·m).
8. To release the spring, turn the manual override
crank in the direction indicated on the label; the
actuator spring returns to its starting position. If this
step is omitted, the spring releases automatically
when power is applied to the actuator.
9. Remove the manual override crank and store it in
an unused mounting hole.
10. Apply power long enough for the actuator to travel
a full stroke, and verify that the actuator rotates
freely throughout the range.
Note:
If electric power is not available, complete
this verification by reinserting the manual override
crank and turning it in the direction indicated to
rotate the coupler to the fully open position.
Rotation Range Using Optional
M9220-603 Adjustable Stop Kit
The actuator is factory set for 90° rotation, and its
rotation range is limited in 5° increments to a minimum
of 30°. Stroke limiting stops are attached in the field to
the shaft coupler side of the actuator to reduce the
rotation range. Attaching a stroke limiting stop in the
furthest mounting position reduces the rotation range of
the actuator by 5°. Each progressive mounting position
reduces the rotation range an additional 5°.
1. Check that the damper blade is accessible or that
its position is permanently marked on the end of
the damper shaft as illustrated in Figure 7.
Note:
Two stops are stacked on top of each other
and assembled with a single screw.
IMPORTANT:
Do not overtighten the mounting
screws to avoid stripping the threads. Be certain that
the tab on the anti-rotation bracket remains properly
positioned in the slot on the actuator, and that the
actuator remains parallel to the mounting surface.
Figure 6: Fitting the Anti-Rotation Bracket on
the Damper Frame or Duct
Anti-rotation Bracket
Anti-rotation Bracket
Slot for Mounting the
Anti-rotation Bracket
Anti-rotation Bracket
Damper Frame
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Actuator Shown with Anti-rotation Bracket
Assembled to Both the Top and Bottom
Anti-rotation Slots
M3 x 9.5 mm
Self-Drilling
Sheet Metal Screws
(Two Locations)
Figure 7: Damper Position Icons
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