18-CD19D5-10 9
Installer’s Guide
FRONT
of Furnace
0
w
q
7. 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.
8. 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.
RETURN AIR FILTER
Filters are factory supplied for these furnaces. These furnaces
require high velocity cleanable type air filters which 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. See Figure 11. Some filters may need to be
trimmed for side or bottom filter use.
Downflow furnace filters must be located outside the furnace
cabinet. Typical installations are shown in Figure 13. Table 5
provides information for installation of the filter retaining
brackets shipped with downflow furnaces.
TABLE 4
MODELS
NUMBERS
CABINET
WIDTH
FILTER
QTY & SIZE
*UC040C924
*UC060C936
*UC080C942
17-1/2" 1 - 17" X 25" X 1"
*UC100C948 21" 1 - 20" X 25" X 1"
*UC100C960 ##
*UC120C960 ##
24-1/2" 1 - 24" X 25" X 1"
*DC040C924
*DC060C936
*DC080C942
17-1/2" 2 - 14" X 20" X 1"
*DC100C948 21" 2 - 16" X 20" X 1"
*DC120C960 24-1/2" 2 - 16" X 20" X 1"
* - First letter may be "A" or "T"
## - Requires filters on 2 sides OR 1 side and bottom filte OR just
the bottom
*
SEE OUTLINE DRAWING
LOCATING
NOTCHES
PROVIDED FOR
SIDE RETURN
CUTOUT
*
*
*
*
CUT OUT FOR
SIDE FILTER
TYPICAL UPFLOW FURNACE
RETURN AIR FILTER INSTALLATIONS
FILTER RETAINER BRACKETS FOR
SIDE AIR RETURN ON UPFLOW FURNACES
If side air return is desired, it is necessary to move the 2 filter
retainer brackets from the bottom of the furnace and reinstall
them on the side. The following instructions should be used:
a. Remove the front doors.
b. Remove the filter.
c. Carefully place the unit on its back.
d. Using a 5/16" nut driver, remove the 4 screws holding the
filter retainer brackets.
e. Reinstall the filter retainer brackets on the desired side.
(See Figure 11 “Typical Side Return Filter”).
TYPICAL SIDE RETURN FILTER
TYPICAL BOTTOM RETURN FILTER
Airflow
Airflow
Airflow
TYPICAL FILTERS OF UPFLOW IN HORIZONTAL
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