Install Instructions

M9208-GGx-x Series Proportional Electric Spring Return Actuators Installation Instructions6
6. Rotate the damper blade(s) 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. The position indicator
should be near the 0° position on the scale. While
holding the manual crank in the wound position,
rotate and hold the red lock shaft approximately
10° then release the manual crank to temporarily
lock the actuator hub in place.
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. To manually unlock the actuator hub, rotate the
manual override crank slightly in the direction
indicated by the arrow and remove it. Alternately,
the hub automatically unlocks when power is
applied to the actuator.
9. Store the manual override crank by applying the
3M® Dual Lock® adhesive-backed strip to the
manual crank and a convenient surface of the
actuator.
10. Apply power long enough for the actuator to travel
a full stroke. 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 hub to the fully open position.
Limiting Rotation Range Using M9208-603
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°.
Figure 6: Anti-Rotation Mounting Bracket Positions
FIG:M9208_ Anti-Rotn_Mntg_Brkt_Po sn
2-1/4
(57.5)
3-9/32
(83.5)
Anti-Rotation Bracket
Damper Frame
Self-Drilling Sheet Metal Screws (2)
Figure 7: Damper Position Icons
FIG:dampers
FIG
:dampos
Figure 8: Limiting Rotation Range
FIG:M9208-Strk_Lmtg_Stop_Opaq_Brkt