Instructions
These installation instructions assume the damper is already
mounted in a duct or sleeve with the damper shaft extending
beyond the duct or sleeve a minimum of 6 inches (152mm).
1. INSTALL THE STANDOFF BRACKET
Dampers with a jackshaft
Jackshaft supplied is typically 1 inch (25mm) diameter.
For these applications the bearing must be removed
from stand-off bracket (item #6). Mount the stand-off
bracket with [4] thread studs (item #8) and [4] 1⁄4-20
splinlock nut (item #2). Orient the stand-off bracket so
the hole is centered on the jackshaft.
Dampers without jackshaft (Shaft Extension)
Mount the stand-off bracket (item #6) spanning across
the damper frame flanges. Fasten to the damper frame
with [4] #14 x 3⁄4Tek screws (item #3). Be sure not to run
the screws into the damper linkage, which is between
the flanges.
2. MOUNT ACTUATOR BRACKET
Mount actuator bracket (item #7) using [4] thread studs
(item #8) and [4] 1⁄4- 20 nuts (item #2).
NOTE: The mounting bracket may be attached in three
positions: parallel with the duct, perpendicular up
from the duct, or perpendicular down from the duct.
Choose a position that offers the most clearance for the
application.
3. ACTUATOR ROTATION
If the fail rotation of the damper is counter clockwise the
universal clamp should be on the side of the actuator
showing the power direction as clockwise rotation
(usually shipped in this orientation).
To change the universal clamp to the other side, remove
the retaining clip and then the universal clamp from the
actuator. Move the universal clamp onto the actuator.
When the clamp is installed, then lock in place using the
retaining clip.
NOTE: All fail rotations refer to the damper shaft rotation
needed to achieve the desire blade fail position. If fail
position is closed, make sure damper blades are fully
close and ensure blade seals are compressed prior to
tightening the actuator clamp to the damper extension
pin or jackshaft. Inspect the damper blades and the
damper shaft to determine the proper damper shaft
rotation for the desired fail position.
4. MOUNTING ACTUATOR
Slide the actuator (item #1) over damper drive shaft.
Install thread stud through the mounting lug on the back
of the actuator and through the corresponding hole of
the actuator bracket (item #7).
Secure the thread stud to actuator bracket with #10-
24 nut. Verify that the damper is in its fail position.
Secure actuator to the damper shaft by torquing the
screw on the actuator universal clamp to 88 in. lbs. .
5. The wiring illustration below identifies actuator electrical
requirements and connections. Wiring must comply
with all applicable electrical codes.
6. Apply power to the actuator. The damper blades
should fully open or close and return to the fail
position when power is disconnected.
Orientation of Stand-off
Bracket for a jackshaft
driven dampers
Orientation of Stand-off
bracket for a directly
driven damper
24 volt
M
Wiring Illustration
Wiring Illustration
Important
A break in power of less than one second can cause the
actuator to spring-return 5 degrees or less and remain in
place until a break in power of longer duration.
Model Volts Running Holding
MS4120F1006
120 VAC 35W 10W
MS4120F1204
MS4620F1005
230 VAC 35W 10W
MS4620F1203
MS7510A2008
24 VAC/VDC
14W
5W
MS7510A2206 14W
MS7520A2007 16W
MS7520A2015 22W
MS7520A2205 16W
MS7520A2213 22W
MS8110A1206 24 VAC/VDC 30W 8W
MS8120F1002
24 VAC 45W 10W
MS8120F1200
464287 • MS4120 MS4620 MS8120, Rev. 9, January 2019 Copyright 2019 © Greenheck Fan Corporation2
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
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