18-CD20D3-18
9
Installer’s Guide
Remove the filter and lay the furnace on its back. Remove
the two 1/4" hex screws securing the bottom front channel
to the cabinet. Lower the front edge of the bottom front
channel and pull forward to remove the channel. The
bottom return air panel will now easily slide out of the
cabinet. Reinstall the bottom front channel and filter for
upflow bottom return installations.
7. The filter retainer is factory supplied for upflow bottom
return. Use the filter retainer on side or bottom if filter
is to be used within the furnace cabinet on upflow only
installations.
8.
The horizontal installation of the upflow furnace
requires an external filter section. Do NOT use the
bottom return filter within the furnace. Filter kits
are available for horizontal applications.
9. Connect duct work to 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.
RETURN AIR FILTERS
TYPICAL UPFLOW RETURN AIR FILTER INSTALLATIONS
Filters are factory supplied for these furnaces. These fur-
naces require high velocity type air filters. The filters may be
located within the furnace blower compartment for UPFLOW
furnaces in either a BOTTOM or SIDE (left side or right side)
return air inlet. Some filters may need to be trimmed for
side or bottom filter use.
TABLE 3
MODELS
NUMBERS
CABINET
WIDTH
FILTER
QTY & SIZE
*UY060R9V3
*UY080R9V3
17-1/2"
1 - 17" X 25" X 1"
*UY100R9V4
21"
1 - 20" X 25" X 1"
*UY120R9V5
24-1/2"
1 - 24" X 25" X 1"
* First letter may be "A" or "T"
** NOTE - On 5 ton airflow models, if the airflow requirement
exceeds 1800 CFM, these models will require return air openings
and filters on both sides; OR 1 side and the bottom; OR just the
bottom.
NOTE:
On upflow 5 ton airflow models, if the airflow requirement
exceeds 1800 CFM, these models will require return air
openings and filters on both sides; OR 1 side and the
bottom; OR just the bottom.
The upflow furnace blower door has a hinge at the bottom
which allows the door to tilt forward for filter replacement
without the door being removed (See Figure 12). The furnace
filter in the bottom or side configuration can be removed by
simply turning the two latches on the blower door and tilting
the door forward.
The filter rails are spring loaded for automatic adjustment to
allow standard size, locally obtainable replacement filters.
The filter rack itself slides to adjust to the required width
needed for bottom or side return (See Figure 13).
BOTTOM FILTER RACK INSTALLATION
With the filter removed, the filter rack is compressed and
then inserted into the bottom of the furnace. The retaining
screw/pin on each side inserts into engagement holes at the
bottom of the furnace cabinet side.
UPFLOW FURNACE ONLY
*
SEE OUTLINE DRAWING
FRONT
of Furnace
LOCATING
NOTCHES PRO-
VIDED FOR SIDE
RETURN CUTOUT
q
Filter Rack Assembly
e
Blower Door Hinge and Bottom Filter Rack Installation
Airf low
w
CUT OUT FOR
SIDE FILTER