10
Downflow
Wood
Sub-base
Floor
Furnace
Sheet
Metal
Plenum
Figure 7. Opening in Wood Floor
Figure 8. Furnace on a Wood Floor
SUPPLY AIR PLENUM
INSTALLATION FOR DOWNFLOW
MODELS
A.
Installation on a concrete slab - downflow
models
1. Construct a hole in the floor per the
dimensions in Figure 5.
2. Place the plenum and the furnace as
shown in Figure 6.
B.
Installation on a combustible floor - *TL
1. Cut hole and frame the hole per the
dimensions in Figure 7.
2. Place sub-base for combustible floors
over the hole with its duct collar extended
downward. Attach the supply air plenum
to the base in a manner which will assure
1” clearance to the flooring or other com-
bustible material. Place furnace on the
combustible base as shown in Figure 8.
3. When the furnace is installed on a factory
or site-built cased air conditioning coil,
the sub-base is not necessary. How-
ever, the plenum attached to the coil
casing must be installed such that its
surfaces are at least 1” from combustible
material in Figure 9.
CIRCULATING AIR SUPPLY
Plenums and air ducts must be installed in
accordance with the Standard for the Installa-
tion of Air Conditioning and Ventilating Systems
(NFPA No. 90A) or the Standard for the Instal-
lation of Warm Air Heating and Air Conditioning
Systems (NFPA No. 90B).
Concrete
Floor
Furnace
Sheet
Metal
Plenum
Figure 6. Downflow Furnace
on a Concrete Slab
Figure 5. Opening for Concrete Slab
Figure 9. Downflow Sub-Base Dimensions
1 inc
h
thic
k fiber
glass 3 lb density
28.38"
9.25"
19.63"
3"
19.75"
or 14.25 or 22.50"*
2.0"
1.58"
1.50"
16.75"
or *19.50"
*Larger dimension
for TL110
18.75"
or 13.25 or 21.50
B
A
MODEL
A
B
*TL 060
13.25”
19.25”
*TL 080/100
18.75”
19.25”
*TL 120
21.50”
19.25”
MODEL
A
B
*TL 060
13.25”
19.63”
*TL 080/100
18.75”
19.63”
*TL 120
21.50”
19.63”
B
A
Summary of Contents for TC060
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