64
S9V2-SVX001-1A-EN
*
*
*
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UPFLOW FURNACES ONLY
LOCATING
NOTCHES
PROVIDED
FOR SIDE
RETURN
CUTOUT
* SEE OUTLINE DRAWING
FRONT
OF FURNACE
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1. When the upflow furnace is installed in the
horizontal right or left application and a return duct
is attached to the top side, do not install a filter in
the return duct directly above the furnace. Install
the filter in a remote location.
When the upflow furnace is installed in the
horizontal right or left application and a close
coupled (less than 36") return duct is attached to the
bottom side of the furnace as shown above,
securely attach a 1/2" mesh metal hardware cloth
protective screen to the inside bottom of the filter
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Close coupled (less than 36") return (filter directly
beneath bottom side return) is not recommended
due to noise considerations.
2. Connect the duct work to the furnace. See Outline
Drawing for supply and return duct size and
location.
Flexible duct connectors are recommended to
connect both supply and return air ducts to the
furnace.
If only the front of the furnace is accessible, it is
recommended that both supply and return air
plenums are removable.
3. When replacing a furnace, old duct work should be
cleaned out. Thin cloths should be placed over the
registers and the furnace fan should be run for 10
minutes. Don’t forget to remove the cloths before
you start the furnace.
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Figure 3. Horizontal upflow furnace with side return
FILTER
CLOSE COUPLED (LESS THAN 36”)
RETURN (FILTER DIRECTLY BENEATH BOTTOM
SIDE RETURN) NOT RECOMMENDED DUE TO
NOISE CONSIDERATIONS. IF USED, SECURELY
ATTACH 1/2” MESH METAL HARDWARE CLOTH
PROTECTIVE SCREEN TO THE INSIDE BOTTOM
OF THE FILTER GRILL.
LESS THAN 36”
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When the Upflow Furnace is installed in the horizontal
configuration, the return air filters must be installed
exterior to the furnace cabinet. Remote filter grilles
may be used for homeowner convenience or the filters
may be installed in the duct work upstream of the
furnace.
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Filters are not factory supplied for downflow furnaces.
Filter size needed will be dependent on type of filter
and CFM requirement. Filters must be installed
externally to the unit.
Table 26. Downflow Return Air Filters
Furnace Width Filter
Qty and Size
17–1/2” 2 — 14” x 20” x 1”
21” 2 — 16” x 20” x 1”
24–1/2” 2 — 16” x 20” x 1”
FFuurrnnaaccee GGeenneerraall IInnssttaallllaattiioonn
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