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Downflow Furnaces
WARNING:
The furnace must not be installed directly on
carpeting,tile,or any combustible material other
than wood flooring.
WARNING:
Failure to install the downflow sub-base kit may
result in fi , property damage or personal injury.
To install the furnace on combustible flooring, a special
sub-base is required. Downflow sub-base kits are factory
supplied accessories and are listed according to the cabinet
letter of the furnace. For 'B', 'C', and 'D' size cabinets use
Kit #904911. Please follow the instructions provided
with the kit.
A downflow sub-base kit is not necessary if the furnace
is installed on a factory or site-built cased air conditioning
coil. However, the plenum attached to the coil casing
must be installed so that its surfaces are at least 1" from
combustible construction.
Installation on a concrete slab
1. Create an opening in the fl
dimensions in
Table
3.
2. Position the plenum and the furnace as shown in
Figure
13.
Inducer & Venting Options
To increase installation flexibility, the inducer assembly
can be rotated to 2 different positions. Each variation has
slightly different requirements with regard to condensate
disposal and, in some cases, the need to seal the furnace
cabinet.
IMPORTANT NOTE
The Inducer Assembly must never be positioned to
vent downwards on horizontal installs.
Before using
Table 4,
the number of pipes (1-pipe or 2-pipe)
connected to the furnace must be known. Find the proper
furnace style (upflow, horizontal, or downflow) and then
the side that the pipes will exit from the furnace. Finally
select the option that properly matches your installation
type from
Figure 37 (page
or
Figure 39 (page
48).
NOTE: It is important that Direct Vent (2-pipe) systems
maintain an airtight flow path from the air inlet to the flue
gas outlet. The furnace ships from the factory with two
holes in the cabinet for the air inlet and flue gas outlet.
In certain configurations, it is necessary to remove and
relocate a plastic cap in the furnace cabinet. If changing
the position of the air inlet and flue gas outlet, it is required
that the previous hole be closed off with the plastic cap to
maintain air tightness in the furnace. The hole locations for
*TC & *TL furnaces are shown in
according to the
46),
Figure 38 (page
47),
Figure 28 (page
32).
Opening in concrete floor
"B"
Cabinet Size
B
C
D
NOTE: Dimensions shown in Inches.
Table 3. Cutout Dimensions
Con
crete
Fl
oor
Figure 13. Furnace on a Concrete Slab
Conventional (1 Pipe)
Vent
Upflow
Horiz. Right
Right
Option 1
N/A
Up
N/A
Option 5
Left
Option 2
N/A
Direct Vent (2-pipe)
Vent
Upflow
Horiz. Right
Right
Option 3
N/A
Up
N/A
Option 7
Left
Option 4
N/A
Table 4. Vent & Inducer Blower Options
Inducer Assembly Rotation
WARNING:
Inducer rotation must be completed before
the furnace is connected to gas and electric. If
both utilities have been connected, follow the
shutdown procedures printed on the furnace
label and disconnect the electrical supply.
"A"
Dim. "A"
Dim. "B"
16 5/8
19 1/4
20 1/8
19 1/4
23 5/8
19 1/4
Furnace
Sheet
Metal
Plenum
Horiz. Left
Downflow
N/A
Option 9
Option 6
Option 10
N/A
Option 11
Horiz. Left
Downflow
N/A
Option 12
Option 8
Option 13
N/A
Option 14
17
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