Direct Drive Damper Actuator
M847D
INSTALLATION INSTRUCTIONS
APPLICATION
The M847D is a two position, 24 Vac spring return damper
actuator designed to operate directly driven zone dampers,
used to control air flow in ducts. The synchronous motor
actuator can be driven open (or closed) using any 24 volt
rated two position switch - e.g. a wall switch or a thermostat
subbase switch.
The M847D replaces the RDMH and RDMZ damper actuators
for use on Trol-A-Temp® ARD and ZD dampers.
SPECIFICATIONS
Electrical Rating: 24 Vac 60 Hz 0.32 Amp., 8 VA
Electrical Connection: 1/2” conduit
Nominal Angular Rotation: 90° (max. 105°)
Torque: Min. 423 mNm* (60 in. oz) output torque available
when motor is energized and device is at the spring
returned initial start position.
Nominal Motor Timing: ( @ 25° C ambient)
Energized at rated load - 30 seconds.
De-energized (spring return) - 10 seconds.
Table 1. Nominal Device Dimension
Ambient Temperature Rating: 5 to 60° C (+40 to 140° F)
Finish: zinc plated steel, anodized aluminium
A
60
B
C
88
D
E
F
84.5
3-3/8
8.2
31.5
1-1/4
19.3
3/4
mm
in
Direction of Shaft Rotation: clockwise, when energized and
2-3/8
3-1/2
5/16
viewed from the base or shaft end.
Mounting Means: direct connection to damper shaft.
Mounting Position: Multi-poise.
Dimensions: See Figure 1.
G
H
J
K
L
M
15.8
5/8
58.6
29.3
33.5
6.4
1/4
40.4
mm
in
2-5/16
1-3/16
1-5/16
1-9/16
*mNm = milli newton meter.
95C-10905-02
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DIRECT DRIVE DAMPER ACTUATOR M847D
1. When viewed on end, the lower lever is normally posi-
tioned to the extreme left (See Fig. 4). This position
allows the damper to fully open 90° when de-energized.
2. To restrict the air flow in the open position, loosen (do
not removed) the wing nut and move the lower lever to
the right until the desired position is reached. Tighten
the wing nut. In the extreme right position the damper
should open approx. 50° with the power off.
3. The upper lever is normally positioned to the right to
provide complete shut off when the actuator is ener-
gized (See Fig. 4).
4. If desired, to prevent complete closure of the damper,
loosen (do not remove) the wing nut on the bottom of
the unit and move the upper lever to the left until the
desired position is achieved. Tighten the wing nut. In the
extreme left position the damper should close to approx.
40° with the power on.
Wiring
See Figure 3 for typical wiring hook-ups of the M847D.
ZONING SWITCH
ORANGE
YELLOW
1
2
24 VAC
60 HZ
OPERATOR
MOTOR
1
2
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
NOMINAL CURRENT 0.32 AMP.
M32381
Fig. 3. Typical M847D Hookup.
5. If additional rotation is required beyond 90°, an addi-
tional 15° may be obtained by removing the Upper
Lever. To do this, first remove the actuator from the
damper. Remove the wing nut and retaining ring then
remove the levers. Reassemble and install.
CHECKOUT
After completing the installation, check that the equipment
operates correctly as follows:
1. When 24 Vac is applied to the motor leads, the motor
powers to the closed or open position.
2. When power is removed, the motor releases and spring
returns to the normal position.
If full opening and closing is not achieved, check the lower
adjustment lever is to the extreme left and the upper lever is to
the extreme right. See Fig. 4 (Air Flow Adjustments).
Air Flow Adjustments
NOTE: The following describes the adjustments available
with the actuator installed in the power closed
mode. If the damper you are installing is to operate in
the power open mode, the function of the upper and
lower levers is reversed.
Fig. 4. Air Flow Adjustment
3
95C-10905—02
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DIRECT DRIVE DAMPER ACTUATOR M847D
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 2010 Honeywell International Inc.
95C-10905—02 T.D. Rev. 12-10
Printed in U.S.A.
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