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cutters, cut an opening between all four knockouts to
expose the blower assembly. Position the return air duct
over the opening in the side and secure together with
sheet metal screws. The screws must penetrate the duct
and furnace casing.
WARNING:
The solid base of the furnace must be in
place when the furnace is installed with side
return air ducts. Removal of all or part of the
base could cause circulation of combustible
products into the living space and create
potentially hazardous conditions, including
carbon monoxide poisoning that could result
in personal injury or death.
Bottom Return Installations
The bottom panel (Figure 20) must be removed from the
bottom of the furnace for bottom return air. If bottom panel
is still installed, go to page 14 for removal instructions.
Position the furnace over the return air duct and secure
together with sheet metal screws. The screws must
penetrate the duct and furnace casing.
Downfl ow Furnaces
To attach the return air duct to the furnace, bend the
furnace fl anges (Figure 20) upward 90° with a pair of
wide duct pliers. Position the duct on top of the furnace
and secure together with sheet metal screws. The screws
must penetrate the sheet metal casing and furnace fl ange.
Tape or seal all seams if required by local code.
Acoustical Treatments
Damping ducts, fl exible vibration isolators, or pleated
media-style fi lters on the return air inlet of the furnace
may be used to reduce the transmission of equipment
noise eminating from the furnace. These treatments can
produce a quieter installation, particularly in the heated
space. However, they can increase the pressure drop in
the duct system. Care must be taken to maintain the proper
maximum pressure rise across the furnace, temperature
rise and fl ow rate. This may mean increasing the duct size
and/or reducing the blower speed. These treatments must
be constructed and installed in accordance with NFPA and
SMACNA construction standards. Consult with local codes
for special requirements. For best sound performance, be
sure to install all the needed gaskets and grommets around
penetrations into the furnace, such as for electrical wiring.
12
FURNACE INSTALLATION
*TA series gas furnaces are shipped ready for installation in
the upfl ow or horizontal right or left positions. Only the *TK
series gas furnace may be used for downfl ow operation.
General Requirements
• The furnace must be leveled at installation and attached
to a properly installed duct system. See Table 1
(page 5) for the required clearances needed to move
the furnace to its installation point (hallways, doorways,
stairs, etc).
• The furnace must be installed so that all electrical
components are protected from water.
• The furnace must be installed upstream from a
refrigeration system. (If applicable)
• The furnace requires special venting materials and
installation procedures. See pages 11 - 12 for venting
guidelines and specifi cations.
Upfl ow Installation
WARNING:
The furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood fl ooring.
Side Return Air Inlet
*TA series gas furnaces are shipped with the bottom panel
installed (Figure 20). If the upfl ow furnace is installed with
side return air, the bottom panel must not be removed.
Bottom Return Air Inlet
*TA series gas furnaces are shipped with the bottom panel
installed. If the upfl ow furnace is installed with bottom
return air, the bottom panel must be removed (See Bottom
Panel Removal on page 14).
Downfl ow Installation
WARNING:
The furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood fl ooring.
WARNING:
Failure to install the downfl ow sub-base kit may
result in fi re, property damage or personal injury.
To install the furnace on combustible fl ooring, a special
sub-base is required. Downfl ow sub-base kits are factory
supplied accessories and are listed according to the
cabinet letter of the furnace. For 'A' size cabinets use Sub-
Base kit #902974 only. For 'B', 'C', and 'D' size cabinets use
Kit #904911. Please follow the instructions provided
with the kit.
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