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When the furnace is used in connection with a cooling unit, the
furnace should be installed in parallel with or on the upstream
side of the cooling unit to avoid condensation in the heating ele-
ment. With a parallel flow arrangement, the dampers or other
means used to control the flow of air must be adequate to prevent
chilled air from entering the furnace and, if manually operated,
must be equipped with means to prevent operation of either unit
unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is recom-
mended that a removable access panel be provided in the outlet
air duct. This opening shall be accessible when the furnace is
installed and shall be of such a size that the heat exchanger can
be viewed for visual light inspection or such that a sampling probe
can be inserted into the airstream. The access panel must be
made to prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return air
entering the furnace must be between 55°F and 100°F.
FILTERS - READ THIS SECTION BEFORE INSTALLING THE
RETURN AIR DUCT WORK
Filters must be used with this furnace. Discuss filter maintenance
with the building owner. Filters do not ship with this furnace, but
must be provided, sized and installed externally by the installer.
Filters must comply with UL900 or CAN/ULCS111 standards. If
the furnace is installed without filters, the warranty will be voided.
On upflow units, guide dimples locate the side return cutout loca-
tions. Use a straight edge to scribe lines connecting the dimples.
Cut out the opening on these lines. NOTE: An undersized open-
ing will cause reduced airflow.
Refer to Minimum Filter Area tables to determine filter area re-
quirements.
600 800 1000 1200 1400 1600 1800 2000
0453__X* 207* 207* 240 288 --- --- --- ---
0704__X* --- --- 318* 318* 336 384 --- ---
0905__X* --- --- --- 413* 413* 413* 432 480
1155__X* --- --- --- 437* 437* 437* 432 480
600 800 1000 1200 1400 1600 1800 2000
0714__X* --- --- 316* 316* 336 384 --- ---
0915__X* --- --- --- 409* 409* 409* 432 480
1155__X* --- --- --- 430* 430* 430* 432 480
Input__Airflow
UPFLOW
COOLING AIRFLOW REQUIREMENT (CFM)
COUNTERFLOW
COOLING AIRFLOW REQUIREMENT (CFM)
Input Airflow
*Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (sq. in)
[Based on a 600 ft/min filter face velocity]
600 800 1000 1200 1400 1600 1800 2000
0453__X* 415* 415* 480 576 --- --- --- ---
0704__X* --- --- 636* 636* 672 768 --- ---
0905__X* --- --- --- 826* 826* 826* 864 960
1155__X* --- --- --- 875* 875* 875* 875* 960
600 800 1000 1200 1400 1600 1800 2000
0714__X* --- --- 634* 634* 672 768 --- ---
0915__X* --- --- --- 819* 819* 819* 864 960
1155__X* --- --- --- 860* 860* 860* 864 960
Input__Airflow
UPFLOW
COOLING AIRFLOW REQUIREMENT (CFM)
COUNTERFLOW
COOLING AIRFLOW REQUIREMENT (CFM)
Input Airflow
*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter area (sq. in)
[Based on 300 ft/min filter face velocity]
UPRIGHT INSTALLATIONS
Depending on the installation and/or customer preference, dif-
fering filter arrangements can be applied. Filters can be in-
stalled in the central return register or a side panel external filter
rack kit (upflows). As an alternative a media air filter or elec-
tronic air cleaner can be used as the requested filter.
The following figure shows possible filter locations.
FILTER
AIR FLOW
CENTRAL
RETURN
GRILLE
FILTER
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
Possible Upright Upflow
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