18-DE01D1-8 5
Installer’s Guide
AIR FOR COMBUSTION AND VENTILATION
CAUTION
!
VENTILATION REQUIRED!
Relief openings in the front or top of the furnace cas-
ing should not be obstructed or blocked. These open-
ings supply combustion and ventilation air to the fur-
nace.
C
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n
c
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s
of
80
%
o
r
g
r
e
a
t
e
r
.
1
) When the
f
urnace is installed in the hori
z
on-
tal con
f
iguration,
t
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o
il
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off
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(
1
)
of
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.
See
Figure 3.
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S
ee
F
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3.
2
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[
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o
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(
3
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5
/
16
i
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. b
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3
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d
.
WARNING
!
POSSIBLE OVERHEATING!
When converting to horizontal, the high limit and fan
control may have to be moved.
Failure to do so may result in an overheating condition
leading to property damage, or loss of life.
4
) When the
f
urnace is installed in the hori
z
on-
tal con
f
iguration,
t
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h
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F
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4.
I
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.
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.
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p
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w
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.
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p
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a
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co
v
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r
of
t
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.
A
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fo
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co
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t
r
o
l
,
i
n
t
h
e
c
a
b
i
n
e
t
.
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