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M847A DRAFT DAMPER OPERATOR
Fig. 2. Short Bracket Model with arm linkage attached.
Dimensions in mm (inches) are nominal.
INSTALLATION
The M847 can be mounted using the mounting bracket
attached to the operator. The motor should be mounted to
allow convenient connection of the drive linkage involved
with the type of draft damper on the heating appliance.
See Figs. 3 and 4 for typical arrangements of both types of
linkages.
It is essential that the location of the operator is such that
the draft damper is fully closed and the chain linkage
slack or the arm free of engagement when the draft
operator is de-energized. The M847 should be protected
by a shield or remotely located, to protect it from damage
by solid fuel which might be dropped when the furnace or
boiler is being loaded.
Fig. 3. Chain linkage
arrangement.
MOUNTING CHAIN MODEL
1. Select the applicable location for the M847 on a wall,
duct, or furnace which is within the temperature lim-
itations of the operator (See Specifications section).
2. Using the mounting plate as a template, drill two
3 mm (1/8" or .125") diameter holes.
95C-10110EF—03
Fig. 4. Actuator arm
arrangement.
3. Fasten the operator to the surface selected using the
two number 8 sheet metal screws provided.
4. Drill a 5 mm (3/16") hole in the draft damper near
the bottom edge. Fasten the chain to the damper
using the bolt and nuts provided as illustrated in
Fig. 5. Hook the other end of the chain through one
of the holes on the lower segment of the actuator
wheel which will provide the maximum lift, or vertical
chain movement. The exact length of the chain used
must be determined by the location of the damper
operator with respect to the draft damper being con-
trolled, keeping in mind that the draft damper must
be fully closed, and the drive chain slack, when the
operator is de-energized and has returned to its fully
closed position.
Fig. 5. Attachment of chain linkage to draft damper.
ACTUATOR ARM MODEL
1. Assemble the arm as shown in Fig. 6.
Screw to be tightened only enough to seat locator pin arm
into hole in wheel so arm can be disengaged from wheel
by depressing arm. See Fig. 8.
Fig. 6. Assembly of arm to operator wheel.
2. Locate the operator beneath the draft damper as
shown in Fig. 7, positioning it so the extreme rota-
tion of the arm will open (raise) the damper the
required amount. The arm must physically engage
the draft damper when the operator is energized.
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