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Les langues disponibles
FURNACE
OR
BOILER
Fig. 7. Typical location of draft damper operator with
arm.
3. The selection of the appropriate arm mounting holes
in the wheel will depend upon the location of the
operator with respect to the lower edge of the draft
damper. Energize and de-energize the operator and
note the exact angular rotation of the wheel to con-
firm the correct positioning.
4. The actuator arm can be disengaged from the wheel
to manually close the draft damper when the
damper operator is energized, or to prevent opera-
tion of the draft damper as the damper operator
responds to the controller. In this position, the actu-
ator arm can be pivoted so as to be clear of the draft
damper during the operator's rotation. See Fig. 8.
LOCATOR PIN
ACTUATOR WHEEL
TO DISENGAGE: (1) DEPRESS AND (2) PIVOT.
Fig. 8. Disengaging actuator arm from draft damper.
WARNING
1. Do not attempt to simulate operation of the operator
by rotating the wheel, or depressing the actuator
arm so as to rotate the wheel. Abuse of this type can
result in stripping the gears in the drive train of this
operator.
2. When the operator is de-energized and at its
extreme closed position, the actuator arm MUST BE
clear of the damper, or the chain linkage slack.
DRAFT
DOOR
DRAFT
DAMPER
OPERATOR
M32410
1
SPRING
2
M32411
M847A DRAFT DAMPER OPERATOR
WIRING
All wiring must comply with local electrical codes and
ordinances. Low voltage connections between the
operator and thermostat and a Class 2 24 VAC
transformer can be made using the two wire nuts
supplied. See Fig. 9 for typical wiring hookup of the M847.
LIMIT
CONTROL
L1
(HOT)
POWER SUPPLY
1
L2
24 VAC
60 HZ
CLASS 2 TRANSFORMER
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
SET HEAT ANTICIPATOR AT 0.32 AMP.
3
MINIMUM ELETRICAL REQUIREMENT 8 VA
Fig. 9. Typical M847A hookup.
CHECKOUT
Energize the system, set the thermostat to call for heat,
and verify that the actuator wheel rotates in a clockwise
direction to open the draft damper. Lower the thermostat
setting and ensure that the operator fully closes the draft.
Raise the thermostat setting again, allow time for the
operator to fully open the draft damper, carefully note the
setting of the limit control, and then turn the limit control
setting down to its lowest scale value. The operator should
go to the fully closed position. If this checkout is being
performed when there is no fire in the furnace or boiler,
simulate limit control operation by opening the system
disconnect switch, removing one lead to the limit control,
and then closing the disconnect again. If the operator
functions as detailed above, re-connect the wiring, and re-
set the thermostat to the normal setting. Be sure the
LINKAGE IS ADJUSTED TO FULLY CLOSE the draft door
whenever the operator is in the closed position. See
warning note above.
3
2
THERMOSTAT
ORANGE
YELLOW
OPERATOR
MOTOR
3
M32412
95C-10110EF—03
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