Greenheck MA Installation Manual
17
20
9
7
19
8
14
13
15
14
6
3
11
6
10
12
13
8
7 9
6
4
5
Ref.
1
2
6
3.00
2.25
16
Rotate as
Req'd (typ.)
C
o
ntr
o
l S
h
a
ft
T
o
Da
m
p
e
r
Jackshafted
Direct Drive
Spring
3.000 in.
Ref.
These parts are for
use with a 1 in. shaft.
14
Part Number 454199
Invensys MA & MC Series
UL Listed Electric Actuators with Two Position Control
INSTALLATION INSTRUCTIONS
These instructions apply to the external field installation of Invensys actuators on Greenheck model VCD Control Dampers when
they are duct mounted or sleeved.
Invensys actuators rotate to their energized position when power is applied and spring return to their fail position when power is
interrupted, except for the MC-431 which drives under power in both directions.
Part No. Qty Description
1 1 Actuator
2 1 Mounting Bracket
3 1 Mounting Plate
4 4
5 3
1
/4- 20 x 1/2 in. Threadstud
1
/4- 20 x 3/4 in. Threadcutting
Screw
6 10
7 3
8 3
9 3
10 1
11 1
1
/4- 20 Spinlock Nut
1
/2 in. Crankarm
5
/16- 18 x 11/2 in. Bolt
5
/16- 18 Spinlock Nut
1 in. Crankarm
3
/8- 16 x 21/2 in. Carriage Bolt
Part No. Qty Description
12 1
13 2
14 2
15 1
16 1
17 4
18 1
19 1
20 4
21 2
3
/8- 16 Spinlock Nut
Linkage Adjustment Pin
1
/4 in. E-ring
Drive Link
Stand Off Bracket
1
/4- 20 x 1/2 in. Thread Cutting Screw
Ball Bearing
1
/4 x 1/2 in. Knurl Pin
1
/4- 20 x 1/2 in. Hex Bolt
#10 Tek Screw
Instructions
A
A
Power
Position
Fail
Position
Power
Return
Damper
Shaft
2 1/4 in.
Tools Required:
Wrenches:
(1) 3/8 in., (2) 1/2 in., (1) 7/16 in.,
and (1) 9/16 in. and (1) Hammer
1. Install the stand off bracket to the damper.
Dampers with a jackshaft
1a. Mount the stand off bracket onto the jackshaft bracket
with (4) 1/4- 20 X 1/2 in. thread cutting screws. Use the
orientation shown on this page.
Dampers without a jackshaft (Shaft Extension)
1b. Mount the stand off bracket spanning across the damper
frame flanges positioned over the control shaft. Use the
orientation shown to the right. The damper shaft must be
centered in the stand off bracket. Fasten to the damper
frame with (4) #14 Tek screws or equal, supplied by
others. Be sure not to run the screws into the damper
linkage which is between the flanges.
2. Fasten the mounting plate to the mounting bracket using
(4) 1/4- 20 x 1/2 in. thread studs and (4) 1/4- 20 spinlock
nuts through the matching four hole pattern on the
mounting bracket labeled “A” on the illustration. Note
that the mounting plate has only one pattern that will
match the mounting plate pattern.
3. Mount the mounting bracket to the stand off bracket
using (4)1/4- 20 x 1/2 in. bolts and (4) 1/4- 20 Spinlock nuts
included with this kit. Use the outer four holes of the
mounting bracket for jackshafted models and the inner
four holes for directly driven models.
Orientation of Stand Off
Bracket for a jackshaft
driven damper
Mounting Plate
Orientation of Stand Off
Bracket for a directly driven
damper
Damper
4. If the damper has a 1/2 in. dia. damper shaft, mount the
ball bearing into the mounting bracket with two #10 Tek
screws. The Tek screws are required to keep the thrust
forces from pushing the bearing out of the mounting
bracket. If the damper shaft is 1 in. in diameter, then no
ball bearing is required.
5. Mount the actuator to the mounting plate in the
corresponding holes using (3)1/4- 20 x 3/4 in. thread
cutting screws. Note that the actuator must be mounted
with the shaft in the horizontal position.
Counterclockwise to Fail Position
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