M9216 Series Electric Spring Return Actuators Installation Instructions 3
2. Bend or cut the anti-rotation bracket to fit the
damper frame or duct as shown in Figure 4.
No. 12-24 Sheet
Metal Screws (2)
Slot for Bracket
Anti-rotation Bracket
Damper
Frame
Tab
Cover Screw
Figure 4: Anti-rotation Bracket Positions
3. Use the anti-rotation bracket as a guide, and drill
the holes in the damper frame or duct for the
bracket (based on the measurements obtained in
Table 1 and Figure 3).
Note: When installing the actuator to a
Johnson Controls damper, use the existing holes in the
damper frame.
4. Attach the anti-rotation bracket to the damper
frame or duct with the two self-tapping screws
provided, using a 1/4 in. (7 mm) flat-blade
screwdriver or 5/16 in. (8 mm) nut driver.
IMPORTANT: Do not overtighten the mounting
screws to avoid stripping the threads.
5. Slide the actuator onto the damper shaft,
positioning the anti-rotation bracket tab into the slot
at the bottom of the actuator. (See Figure 4.)
6. Insert the manual crank. Push it in firmly, and turn
it CW four or five turns (position indicator should
be between the 3 and 5° mark on the actuator
scale). Turn the manual crank 1/4 turn CCW to
lock this position.
7. Close the damper tightly.
8. Keeping the actuator flat, evenly hand tighten each
clamp nut onto the U-bolt. Secure the U-bolt to the
damper shaft to achieve a torque of 100 to
125 lb∙in (11 to 14 N∙m).
9. Turn the manual crank CW to release the spring,
and remove the manual crank. (The actuator
spring returns to its starting position.)
10. Verify that the actuator rotates freely throughout
the range. (This may be done by applying a full
stroke control signal or reinserting the manual
crank and turning it CW to rotate the coupler to the
fully open position.)
Rotation Range
The actuator is factory set for 0 to 93° rotation. The
rotation range is changed by adjusting the rotation
limiters. This may be done by using an input signal or
the manual crank. To change the rotation range using
the manual crank:
IMPORTANT: Turn the manual crank in a
CW direction only, unless locking a new position.
1. Push the manual crank firmly into the manual
override gear (shown in Figure 3), and wind in a
CW direction until the position indicator reaches
the 45° position.
2. Lock this position by winding the manual crank
1/4 turn CCW or until a slight resistance is felt.
3. Use a 7 mm nut driver to loosen the screws on the
rotation limiter. (See Figure 5.)
Note: Rotation limiters are shown
factory set in the fully down
position for 90° rotation.
0
3
0
6
0
9
0
0
3
0
Limit Stop
Screws
(2 on Each
Limiter)
Rotation
Limiters (2)
0
10
30
20
(Increments
correspond
to those on
the opposite
side.)
Figure 5: Rotation Limiters
4. Slide the rotation limiter to the desired position,
and retighten the screws to a maximum of
30 lb∙in (3.4 N∙m).
Examples of rotation limiter adjustments:
• For a rotation range of 30°, adjust both limiters
fully up.
• For a range of 45°, adjust one rotation limiter
to 30° and the other to 15°.
• For a range of 60°, adjust one limiter to 30°,
and leave the other at 0°.
5. Reinsert the manual crank into the manual
override gear.
6. Repeat Steps 2 through 5 to set the rotation range
for the second rotation limiter.
7. Release the manual crank spring lock by winding
the crank 1/4 turn in a CW direction.
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