M9203-AGx-2(Z) Series On/Off and Floating Point Electric Spring Return Actuators Installation Guide
5
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. Mark or 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 No. M3.5 x 9.5 mm
self-drilling sheet metal screws provided.
5. Slide the actuator onto the damper shaft, and
position the anti-rotation bracket tab into the slot at
the bottom of the actuator as illustrated in Figure 6.
6. Rotate the damper blade(s) to the desired position
if the power is lost.
7. Hold the actuator perpendicular to the damper
shaft. Evenly hand-tighten each nut on the coupler
U-bolt, then torque the coupler U-bolt nuts to
100 to 125 lb·in. (11 to 14 N·m).
8. Apply power long enough for the actuator to travel
a full stroke. Verify that the actuator rotates freely
throughout the range.
Limiting Rotation Range Using M9203-603
Adjustable Stop Kit
The actuator is factory set for 95° rotation, and its
range is limited in 5° increments to a minimum of 35°. A
stroke-limiting stop can be attached in the field to the
shaft coupler side of the actuator to reduce the rotation
range. Attaching the 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 visible or its
position is permanently marked on the end of the
damper shaft, as illustrated in Figure 7.
2. Position the stroke-limiting stop in the serrated slot
with its leading edge at the scale position matching
the desired stroke.
3. The product label marks hole positions for the
M3-0.5 x 8 mm self-tapping screw provided with
the adjustable stop kit. Drive the screw through the
slot in the adjustable stop and into the actuator
face over a marked hole position. (See Figure 8.)
Note:
The minimum rotation range is 35°.
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.
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: Anti-Rotation Mounting Bracket
F
IG
:M
920
3_
A
nt
i-
R
ot
n_
M
nt
g_Br
kt
_Po
sn
2-1/4
(57.5)
3-1/4
(82.5)
Anti-Rotation Bracket
Damper Frame
Self-Drilling Sheet Metal Screws (2)
Figure 7: Damper Position
FIG
:d
a
m
p
e
rs
FI
G
:d
am
pos
Figure 8: Limiting Rotation Range
F
IG
:s
trk
_lim
it