M9220-Bxx-3 On/Off Electric Spring Return Actuators Installation Guide
6
Note:
The actuator requires 27 rotations of the
manual override crank from the fully spring return
position to fully reposition the actuator hub. At the
end of travel, the rotational resistance increases;
do not force the actuator hub past this point.
4. Rotate the manual override crank a half turn in the
opposite direction to lock the actuator hub in place.
Note:
Rotate the manual override crank in the
direction indicated by the arrow on the label to
unlock the actuator hub. The actuator hub
automatically unlocks when power is applied to the
actuator, and returns the actuator to normal drive
and spring return operation.
Mounting the Actuator
To mount the actuator, proceed as follows:
1. See the dimensions in Figure 5 and Table 2 to
ensure the correct positioning of the anti-rotation
bracket.
2. Bend or cut the anti-rotation bracket to fit the
damper frame or duct as illustrated in Figure 6.
Note:
The anti-rotation bracket can be bent 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.
Table 2: Dimensions from Anti-Rotation Bracket
to Shaft Center
Shaft Diameter Dim. A,
in. (mm)
Dim. B,
in. (mm)
1/2 to 9/16 in.
(12 to 14 mm)
8-9/32
(210)
7
(178)
5/8 to 3/4 in.
(16 to 19 mm)
8-5/32
(207)
6-29/32 (175)
IMPORTANT:
The tab on the anti-rotation bracket
must fit midpoint in the actuator slot. Positioning the
tab midpoint in the slot prevents actuator binding
and premature wear, and makes actuator removal
easier.
Figure 5: Positioning the Anti-Rotation
A
Dimension
B
A
F
IG
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po
s
Dimension
A
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
FI
G
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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)
