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166753-UIM-C-0706
RESIDENTIAL AND NON HUD MODULAR HOME
RESIDENTIAL AND NON HUD MODULAR HOME
RESIDENTIAL AND NON HUD MODULAR HOME
RESIDENTIAL AND NON HUD MODULAR HOME
UPFLOW RETURN PLENUM CONNECTION
UPFLOW RETURN PLENUM CONNECTION
UPFLOW RETURN PLENUM CONNECTION
UPFLOW RETURN PLENUM CONNECTION
Return air may enter the furnace through the side(s) or bottom depend-
ing on the type of application. Return air may not be connected into the
rear panel of the unit. In order to achieve the airflow indicated, it is rec-
ommended those applications over 1800 CFM (57 m³/min) use return
air from two sides, one side and the bottom or bottom only. For single
return application, see data and notes on blower performance data
tables in this manual.
BOTTOM RETURN AND ATTIC INSTALLATIONS
BOTTOM RETURN AND ATTIC INSTALLATIONS
BOTTOM RETURN AND ATTIC INSTALLATIONS
BOTTOM RETURN AND ATTIC INSTALLATIONS
Bottom return applications normally pull return air through a base plat-
form or return air plenum. Be sure the return platform structure or return
air plenum is suitable to support the weight of the furnace.
The furnace base is equipped with a rectangular panel that can be
removed by performing the following steps:
1.
Lay the furnace on its back.
2.
Remove the screws from the toe plate.
3.
Remove the toe plate.
4.
Pull the base plate out of the furnace base.
5.
Reinstall the toe plate and secure with the screws that were
removed.
Attic installations must meet all minimum clearances to combustibles
and have floor support with required service accessibility.
IMPORTANT: If an external mounted filter rack is being used see the
instructions provided with that accessory for proper hole cut size.
HORIZONTAL MODELS
HORIZONTAL
MODELS
HORIZONTAL
HORIZONTAL
MODELS
MODELS
Horizontal Installations With a Cooling Coil Cabinet
The furnace should be installed with coil cabinet part number specifi-
cally intended for Horizontal application. If a matching cooling coil is
used, it may be placed directly on the furnace outlet and sealed to pre-
vent leakage. Follow the coil instructions for installing the supply ple-
num. For details of the coil cabinet dimensions and installation
requirements, refer to the installation instructions supplied with the coil
cabinet
Attach the supply plenum to the air conditioning coil cabinet outlet duct
flanges through the use of S cleat material when a metal plenum is
used. The use of an approved flexible duct connector is recommended
on all installations. The connection to the furnace, air conditioning coil
cabinet and the supply plenum should be sealed to prevent air leakage.
The sheet metal should be crosshatched to eliminate any popping of
the sheet metal when the indoor fan is energized.
The minimum plenum height is 12" (30.5 cm). If the plenum is shorter
than 12" (30.5 cm) the turbulent air flow may cause the limit controls not
to operate as designed, or the limit controls may not operate at all. Also
the plastic drain pan in the air conditioning coil can overheat and melt.
Refer to the installation instructions supplied with the air conditioning
coil for additional information.
6
Horizontal Installations Without a Cooling Coil Cabinet
When installing this appliance, the furnace must be installed so as to
create a closed duct system, the supply duct system must be con-
nected to the furnace outlet and the supply duct system must terminate
outside the space containing the furnace. When replacing an existing
furnace, if the existing plenum is not the same size as the new furnace
then the existing plenum must be removed and a new plenum installed
that is the proper size for the new furnace.
Attach the supply plenum to the furnace outlet duct flanges through the
use of S cleat material when a metal plenum is used. The use of an
approved flexible duct connector is recommended on all installations.
This connection should be sealed to prevent air leakage. The sheet
metal should be crosshatched to eliminate any popping of the sheet
metal when the indoor fan is energized. On all installations without a
coil, a removable access panel is recommended in the outlet duct such
that smoke or reflected light would be observable inside the casing to
indicate the presence of leaks in the heat exchanger. This access cover
shall be attached in such a manner as to prevent leaks.
Residential and Non Hud Modular Home Horizontal Return
Plenum Connections
The return duct system must be connected to the furnace inlet and the
return duct system must terminate outside the space containing the fur-
nace. When replacing an existing furnace, if the existing plenum is not
the same size as the new furnace then the existing plenum must be
removed and a new plenum installed that is the proper size for the new
furnace.
Attach the return plenum to the furnace inlet duct flanges. This is typi-
cally through the use of S cleat material when a metal plenum is used.
The use of an approved flexible duct connector is recommended on all
installations. The connection of the plenum to the furnace and all the
ducts connecting to the plenum must be sealed to prevent air leakage.
The sheet metal should be crosshatched to eliminate any popping of
the sheet metal when the indoor fan is energized.
The duct system is a very important part of the installation. If the duct
system is improperly sized the furnace will not operate properly. The
ducts attached to the furnace must be of sufficient size so that the fur-
nace operates at the specified external static pressure and within the air
temperature rise specified on the nameplate.
Attic installations must meet all minimum clearances to combustibles
and have floor support with required service accessibility.
IMPORTANT: if an external mounted filter rack is being used see the
instructions provided with that accessory for proper hole cut size.
ATTIC INSTALLATION
ATTIC INSTALLATION
ATTIC INSTALLATION
ATTIC INSTALLATION
LINE CONTACT ONLY PERMISSIBLE
BETWEEN LINES FORMED BY THE
INTERSECTION OF FURNACE TOP
AND TWO SIDES AND BUILDING
JOISTS, STUDS OR FRAMING
FILTER RACK
MUST BE A MINIMUM
GAS PIPING
DISTANCE
OF 18" (45.7 cm)
FROM THE
FURNACE
RETURN AIR
SEDIMENT
TRAP
FIGURE 2: Typical Attic Installation
SUPPLY AIR
VENT (Maintain
required clearances
to combustibles)
SHEET METAL
IN FRONT OF
FURNACE
COMBUSTION AIR
OPENINGS IS
RECOMMENDED
30" MIN.
WORK AREA
12"
Unitary Products Group
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