Installer’s Guide
18-CD21D1-12
Bottom Panel
Filter
Rack
Furnace
Cabinet
Side
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Bottom Return
Filter Rack
Installation With
Filter
Rack
Furnace
Cabinet
Side
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Bottom Return
Filter Rack
Installation With
BLOWER
DECK
Filter
Rack
Assembly
Furnace
Blower
Deck
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Return
Filter Rack
Installation With
Side
Furnace
Cabinet
Side
i
p
RETURN AIR FILTERS FOR UPFLOW FURNACE IN
HORIZONTAL CONFIGURATION
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 fur-
nace. See Figure 17.
UPFLOW FILTER CLIP/ BRACKET INSTALLATION
1. Determine the location to be used. The furnace
cabinet has dimples for location of the alter-
nate furnace clips (Side return only). Pre-drill
clearance holes with a 3/16" drill. Bottom
return holes are pre-drilled. See Figure 21.
Attach clip to bottom channel and rear of unit
with screws provided for bottom return.
2. Install the clips in front and rear of the desired
location using the screws provided. The filter
clip with the leaf spring mounts in the
rear of the cabinet.
TYPICAL DOWNFLOW FURNACE RETURN AIR FIL-
TER INSTALLATIONS
These furnaces require high velocity type air filters.
Downflow furnace filters must be located outside the
furnace cabinet. Typical installations are shown in
Figure 22. Tables 5 and 6 provide information for in-
stallation of the filter retaining brackets shipped with
downflow furnaces.
a
s
Airflow
o
SIDE
CUT-OUT
ALTERNATE SIDE
FILTER CLIPS
LOCATIONS
ALTERNATE BOTTOM
FILTER CLIPS LOCATIONS
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