TrueZone Direct Drive
Damper Actuator
M847D-Vent
M847D-Zone
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 ARD, EARD and ZD dampers.
INSTALLATION INSTRUCTIONS
SPECIFICATIONS
Electrical Rating: 24 Vac 60 Hz 0.32 Amp., 8 VA
Electrical Connection: Tool-Less insertion of 18-22 AWG
Solid Wire.
Nominal Angular Rotation: 90° (max. 105°)
Torque: 60in. oz (.423 Nm)
Nominal Motor Timing: ( @ 25° C ambient)
Energized at rated load - 30 seconds.
De-energized (spring return) - 10 seconds.
Ambient Temperature Rating: 5 to 60° C (+40 to 140° F)
Direction of Shaft Rotation: clockwise, when energized and viewed from the base or shaft end.
Mounting Means: direct connection to damper shaft.
Mounting Position: Multi-poise.
Dimensions: See Fig. 1.
4-31/32
(126)
4-41/64
(118)
4-1/16
(103)
3-61/64
(100)
Fig. 1. Dimensional Details.
M35186
33-00038-01
TRUEZONE DIRECT DRIVE DAMPER ACTUATOR
INSTALLATION AND
CHECKOUT
CAUTION
1. Read these instructions carefully. Failure to follow them could cause a hazardous condition.
2. Disconnect power supply before beginning of installation and wiring of control to prevent electrical shock or equipment damage.
3. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
4. All wiring must comply with local electrical codes, ordinances, and regulations.
5. Installer must be a trained, experienced service technician.
6. After installation is complete, check out the product operation as provided in these instructions.
WARNING
1. DO NOT install this actuator on a flue damper.
2. DO NOT attempt to rotate the actuator by turning the connection coupling or the damper shaft when it is connected to the actuator or damage to the gear train may occur.
STANDARD MOUNTING (FOR 5/16” DIA. DAMPER SHAFT)
The M847D can be attached directly to the protruding 5/16” diameter damper shaft using the sleeve of the output shaft.
Drill a 5/16” (8 mm) hole 1-5/16” (33.5 mm) directly below the damper shaft opening to accept the anti-rotation shaft protruding from the base of the motor. The length of the damper shaft to which the connection coupling is attached is such as to firmly hold the actuator in a position to adequately
engage the anti-rotation pin in the warm air duct. See Fig. 1
for the critical dimensions.
REPLACING M847D ON A HONEYWELL ARD DAMPER
1. Disconnect the motor wiring.
2. Using a 1/8 in. hex wrench to loosen the motor coupling from the blade shaft, remove the existing motor assembly.
3. Observe that the damper blades are in the normal, spring open or spring closed position.
4. Place the new motor onto the shaft and tighten the coupling.
5. Reconnect the motor wiring.
ALTERNATE MOUNTING (FOR 7/16” DIA. COUPLING
STYLE DAMPERS)
Before installing the M847D actuator to a damper with a 7/16” coupling, insert the drive shaft extension into the drive shaft
and tighten with the set screw provided. See Fig. 2. Also
install the anti-rotation extension to the end of the anti-rotation rod. Install the actuator on the damper and tighten the coupling screw.
M35189
Fig. 2. For 7/16” Coupling Models Only.
REPLACING M847D ON A HONEYWELL ZD DAMPER
1. Disconnect the motor wiring.
2. Using a 3/16 in. hex wrench to loosen the Allen screw located above the faceplate at the motor coupling.
3. Remove the existing motor.
4. Observe that the damper blades are in the open position with the setscrew pointing toward the damper label.
5. Attach the new motor to the coupling. Make sure that the standoff on the motor is positioned in the grommet on the faceplate.
6. Tighten the set screw.
7. Reconnect the motor wiring.
Wiring
See Fig. 3 for typical wiring hook-ups of the M847D.
1
24 VAC
60 HZ
ZONING SWITCH
ORANGE
YELLOW
2
1
OPERATOR
MOTOR
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 NOMINAL CURRENT 0.32 AMP.
M35190
Fig. 3. Typical M847D Hookup.
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).
33-00038—01 2
Air Flow Adjustments
NOTE: The following describes the air flow adjustment position available with the actuator installed in the power closed mode for the M847D-Zone and power open for the M847D-Vent actuators.
2
3
0
1
Table 1. Air Flow Adjustment.
Range Stop Setting Bleed Rate*
0
20%
30%
50%
TRUEZONE DIRECT DRIVE DAMPER ACTUATOR
RANGE STOP
LOCATIONS
M35187
Fig. 4. Air Flow Adjustment.
3 33-00038—01
TRUEZONE DIRECT DRIVE DAMPER ACTUATOR
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422 customer.honeywell.com
® U.S. Registered Trademark
© 2014 Honeywell International Inc.
33-00038—01 M.S. 12-14
Printed in United States
