Honeywell M847D - Manual

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 - eg. 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 (milli newton meter) [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.

Ambient Temperature Rating:

5 to 60°C (+40 to 140°F)

Finish:

zinc plated steel, anodized aluminium

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 Figure 1.

11-01 © Honeywell Limited. 2001 • Form Number: 95C-10905-1

Direct Drive Damper Actuator

M847D

INSTALLATION AND CHECKOUT

Fig. 1 - Dimensional Details

1. Read these instructions carefully. Failure to follow them could

cause a hazardous condition.

2. Disconnect powersupply 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.

!

CAUTION

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" (8mm) hole 1-5/16"

(33.5mm) 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 Figure 1. for the critical dimensions.

Nominal Device Dimension

mm

60

84.5

88

8.2

31.5

19.3

in

2-3/8

3-3/8

3-1/2

5/16

1-1/4

3/4

A

B

C

D

E

F

mm

15.8

58.6

29.3

33.5

6.4

40.4

in

5/8

2-5/16

1-3/16

1-5/16

1/4

1-9/16

G

H

J

K

L

M