2
M9216 Series Electric Spring Return Actuators Installation Instructions
3. Insert the sleeve into the back of the actuator with
the smooth half of the sleeve inserted first. Make
sure the gap in the sleeve rim aligns with the
two guide marks on the back of the actuator shown
in Figure 2.
Note:
The drive direction of the actuator is reversed
when the sleeve is changed from the front to the back
of the actuator.
CCW Spring Return Direction
CW Spring Return Direction
Guide Marks
Front
0
0
90
90
30
30
60
60
Guide Marks
Back
Triangle on Each Scale to Mark Scale Selection
Gap in Sleeve Rim
Smooth Side of Sleeve
Figure 2: Location of Guide Marks
4. Align the tab on the coupler with the gap in the
sleeve rim, and insert the coupler into the front of
the actuator.
5. Replace the locking clip to secure the coupler and
sleeve in the actuator.
6. Fill in the triangle on the actuator cover with a
marking pen to indicate the scale being used.
Counterclockwise
For the actuator to spring return in a CCW direction,
refer to Figure 3 and proceed as follows:
1. Turn the actuator over. Use a flat-blade
screwdriver to release the locking clip, and remove
it from the coupler.
2. Remove the coupler from the front of the actuator
and the sleeve from the back of the actuator.
3. Insert the sleeve into the front of the actuator with
the smooth half of the sleeve inserted first.
(See Figure 2.)
Note:
Make sure the gap in the sleeve rim aligns with
the two guide marks on the front of the actuator.
4. Repeat Steps 4, 5, and 6 of the previous section.
Mounting
IMPORTANT:
Make sure the space between the
back of the actuator and the mounting surface is at
least 5/32 in. (4 mm).
M9216 actuators may be mounted in any convenient
orientation. They may be installed on a 3/8 to 3/4 in.
(9.5 to 19 mm) round or a 3/8 to 5/8 in. (9.5 to 16 mm)
square shaft, 3 in. (76 mm) or longer. If the shaft is
less than 3 in. (76 mm) long, install an extension
recommended by the damper or valve manufacturer.
For 1 in. (25.4 mm) outside diameter shafts, use the
M9000-154 1 in. Jackshaft Coupler.
To mount the actuator, proceed as follows:
IMPORTANT:
The tab on the anti-rotation bracket
must fit midpoint in the actuator slot to prevent
actuator binding and premature wear.
1. Refer to the “A” Dimensions in Table 1 and
Figure 3 to ensure the tab on the anti-rotation
bracket fits midway in the actuator slot.
Table 1: Shaft Sizes and Distances from
the Anti-rotation Bracket to Shaft Center
Shaft Diameter
5/8 in.
1/2 in.
3/8 in.
“A” Dimensions
8-1/4 in.
8-5/16 in.
8-3/8 in.
(See Figure 3.)
209 mm
211 mm
213 mm
0
U-bolt
with
Clamp
Nuts (2)
Anti-rotation
Bracket
Note: “A” is the distance from the center of
the holes in the anti-rotation bracket to
the center of the shaft. (See Table 1.)
Shaft
Center
A
Manual
Crank
Inserted in
the Override
Gear
Coupler
Position
Indicator
90
90
60
60
30
30
0
0
Figure 3: Mounting Positions
