14
side) of the furnace or in parallel with the furnace.
furnace, a damper must be installed to prevent chilled
air from entering the furnace and condensing on the heat
it must be designed so that operation of the furnace is
prevented when the damper is in the cooling position
and operation of the cooling system is prevented when
the damper is in the heating position.
Return Air Connections
air to areas outside the space where the furnace is
installed, the return air must be delivered to the furnace
size and without interruption.
opening and return air duct. NOTE: The ductwork must
29)
for return air opening size.
side, right side, or bottom of the furnace. NOTE:
the left or right side of the furnace for return air, the
) must not be removed from the
bottom of the furnace.
WARNING:
Side Return Installations: To attach the return air duct
to the left or right side of the furnace, punch out the 4
29)
. Using sharp metal cutters, cut an opening
Position the return air duct over the opening and secure
to the side with sheet metal screws.
) must
page
16
for removal instructions. Position the furnace over
the return air duct and secure together with sheet metal
screws. Make sure the screws penetrate the duct and
furnace casing.
CIRCULATING AIR REQUIREMENTS
WARNING:
29)
are recommended. NOTE:
furnaces cannot be changed manually by resetting the
dipswitches on the motor control board.
removable access panel. The opening should be
accessible when the furnace is installed in service and
shall be of a size that smoke or reflected light may be
observed inside the casing to indicate the presence of
shall be attached in such a way as to prevent leaks.
must be designed so that the return air is not less than
and outdoor air is used, the ducts and damper system
must be designed so that the return air supply to the
indoor return air applications.
furnace blower to provide airflow over the indoor coil,
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