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16
NOTES:
• Before installing this furnace, consider all
clearances for the installation and future
servicing of the furnace. Refer to Table 1.
• The 2 Wire Relay Control is NOT recom-
mended for upfl ow applications, instead, the
AC/HP Relay Control (4-7 wire) should be used
when converting some models to accept an
air conditioner. See Relay Control installation
instructions for further details.
Figure 17. Over-the-Floor Return Air Sys-
tem with Upfl ow Stand
Upflow Duct
Connector
Furnace
Filter
(one obtained
from furnace)
Upflow Stand
Low Voltage Wire Entrances
Refrigerant
Line Knockouts
Blower Selector
Switch (EH Only)
Tie-Down Tab
(See Inset)
Power
Supply
Wire
Entrances
Power
Supply
Wire
Entrances
Blower Selector
Switch (EH Only)
Refrigerant
Line
Knockouts
Low Voltage
Wire Entrances
Figure 16. Downfl ow and Upfl ow Installations
Tie Down Tab
DOWNFLOW INSTALLATION UPFLOW INSTALLATION
Return Air and Filtering Systems
Furnaces may be installed with unducted or
ducted return air. For unducted systems with
air conditioners or heat pumps, the following
optional equipment is recommended: upfl ow
stand, coil cabinet, upfl ow duct connector, and
wall mount grille. For ducted systems with air
conditioners or heat pumps, the following optional
equipment is recommended: coil cabinet and
upfl ow duct connector.
NOTE: Refer to the instructions supplied with
any additional accessories for further installa-
tion details.
Filtering Methods - Non-Ducted Return Air
1. Without optional upfl ow stand: (see Figure
18)
-install a fi lter with a minimum unrestricted
medium area of 324 square inches below
the coil cabinet/furnace assembly that is
accessible for monthly cleaning or replace-
ment by the homeowner
2. With optional upfl ow stand: (see Figure 17)
Stand must use two fi lters; one is supplied
with the stand and the other MUST be
removed from the furnace and placed in
the stand - see upfl ow stand instructions
for additional details.
Filtering Methods - Ducted Return Air
1. Install a fi lter with a minimum unrestricted
medium area of 324 square inches below
the coil cabinet/furnace assembly that is
accessible for monthly cleaning or replace-
ment by the homeowner