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To remove the vent door:
Access the vent door by removing the Phillips-head
screw securing the cover and removing 2 Phillips-
head shipping screws. Remove the cable from the
door post. Remove the 7 Phillips-head screws from
the vent frame and remove the door.
Note:
To access the 3 Phillips-head screws on
the hinge side of the door it may be necessary to
remove the unit from the case and reposition the
outdoor coil and shroud assembly.
Remove the cable wire retainer from the top of the
vent door, remove the cable wire from the door post,
then raise the cable from the slotted alignment
bracket and pull the assembly outward.
Note:
When reinstalling the vent door cable, insert
the cable in it’s original position in the slotted
alignment bracket. If necessary, reposition cable in
alignment slot for proper operation.
Vent Door and Cable
The vent door is manually operated by a vent
control, which is located at the upper left side of the
unit behind the front cabinet. A cable connects the
vent control to the vent door. The door is factory-
set and locked in the CLOSE position by 2 shipping
screws.
Only the air inside the room is circulated and fi ltered
when the door is in the CLOSE position. When set
to the OPEN position, some outdoor air will be
drawn into the room. This will reduce the heating or
cooling effi ciency. A replaceable screen in the vent
inlet prevents unwanted matter from entering the
plenum.
Vent Door
Vent Control
CN1
- Room Air Thermistor
and Indoor Coil
Thermistor
CN3
- Power Supply Board
CN5
- Transformer
CN1
CN3
CN5
R
C
Shipping Screws
Control Board
Note:
The following information is for units with
AC fan motors. Units with DC fan motors have
connectors CN4 and CN9 that are not shown on the
following photos.
The user controls are located behind a door in the
top right of the room cabinet. The room cabinet
must be removed to remove the control panel and
access the control board.
The control board is located behind the control
panel and mounted inside a triangular metal
bracket. The triangular metal bracket is held in place
by 3 Phillips-head screws.
The control board is held in place by 2 Phillips-head
screws, two 11-mm retainer nuts, and 2 plastic
locking tabs.
To check power to the control board from the low
voltage transformer, check for 24 VAC at the CN5
connecting wire. The control board should read
24 VAC between R and C (see photo).
All manuals and user guides at all-guides.com
