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12 18-CD22D1-8
Installer’s Guide
e
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.
Conversion kits for horizontal filters are BAYFLTR203
for 17 1/2" width cabinets, BAYFLTR204 for 21" width
cabinets, and BAYFLTR205 for 24" width cabinets.
These include filters and brackets necessary for hori-
zontal filters. In addition, optional door kit
BAYFLTR206 is also available. See Figures 17 and 19.
FILTER RACK INSTALLATION FOR SIDE RETURN AIR
ON UPFLOW FURNACES (Left or Right)
The following checklist should be used when installing
a right or left side return filter on an upflow furnace:
a. Remove the filter.
b. Remove the filter rack.
c. Leave the bottom panel in place.
e. Make side cutout by following the directions in
the “Return Air Duct Connections” section on
page 10.
e. Compress the filter rack and reinstall in the
side position on the furnace. Confirm that the
upper retaining pin/screw locks into the engage-
ment hole in the blower deck and the lower pin/
screw rests against the side of the bottom panel.
See Figures 13-16.
f. Reinstall the furnace filter in the side position by
inserting the chamfer end first into the filter
rack.
RETAINING
PIN
(Both Sides)
SPRINGS
SIDE
CUTOUT
FILTER
RACK
RAILS
BOTTOM
PANEL
INSTALLED
Airflow
Airflow
r
Typical Upflow Right Side Return Filter Rack Installation
RETAINING
PIN
(Both Sides)
SPRINGS
SIDE
CUTOUT
FILTER
RACK
RAILS
BOTTOM
PANEL
INSTALLED
Airflow
Airflow
Typical Upflow Left Side Return Filter Rack Installation
e
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
Filter
Rack
Furnace
Cabinet
Side
Filter Rack
Retaining
Screw/Pin
Engagement Hole
For
Bottom Return
Filter Rack
Installation With
u
Typical Horizontal Filter Installation
Airflow
t
y
Optional door kit
BAYFLTR206