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Additional Venting Requirements - Kenmore N8MSL0701412A1 Installation Instructions Manual

80% single stage psc motor category i, gas furnace
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APPLIANCE APPLICATION
REQUIREMENTS
Appliance
operation
has
a
significant
impact
on
the
performance
of the venting system.
If the appliances
are
sized, installed, adjusted, and operated properly, the venting
system
and/or
the
appliances
should
not
suffer
from
condensation
and corrosion.
The venting
system
and all
appliances
shall be installed
in accordance
with applicable
listings, standards, and codes.
The furnace should be sized to provide 100 percent of the
design heating load requirement plus any margin that occurs
because of furnace model size capacity increments. Heating
load estimates
can be made
using
approved
methods
available
from
Air
Conditioning
Contractors
of America
(Manual J); American Society of Heating, Refrigerating,
and
Air-Conditioning
Engineers;
or other approved
engineering
methods.
Excessive
oversizing
of the furnace could cause
the furnace and/or vent to fail prematurely.
When a metal vent or metal liner is used, the vent must be in
good condition and be installed in accordance
with the vent
manufacturer's
instructions.
To prevent condensation
in the furnace and vent system, the
following precautions must be observed:
1. The return-air
temperature
must be at least 60°F
(16°0) db except for brief periods of time during warm-
up from setback at no lower than 55°F
(13°O) db or
during initial start-up from a standby condition.
2. Adjust the gas input rate per the installation
instruc-
tions. Low gas input rate causes low vent gas temper-
atures, causing condensation
and corrosion in the fur-
nace and/or venting system. Derating is permitted only
for altitudes above 2000 ft. (610 M).
3. Adjust the air temperature
rise to the midpoint of the
rise range or slightly above. Low air temperature
rise
can cause low vent gas temperature
and potential for
condensation
problems.
4. Set thermostat heat anticipator or cycle rate to reduce
short cycling.
Table 8_ EXTERIOR MASONRY CHIMNEY FAN + NAT
INSTALLATIONS
WITH TYPE-B
DOUBLE WALL VENT
CONNECTORS
©NFPA & AGA Combined Appliance
Maximum Input
Rating in Thousands of Btuh per Hour
INTERNAL AREA OF CHIMNEY
VENT HEIGHT
FT, (i)
6 (1.8)
8 (2.4)
10 (3.0)
15 (4.5)
20 (6.0)
30 (9.1)
12
(7741)
74
80
84
NR
NR
NR
SQ. IN. (SQ. MM)
19
28
(12258)
(18064)
119
178
130
193
138
207
152
233
N R
250
NR
NR
38
(24516)
257
279
299
334
368
404
Table 9--Minimum
Allowable Input Rating of Space-Heat-
ing Appliance in Thousands of Btuh per Hour
VENT HEIGHT
INTERNAL AREA OF CHIMNEY
SQ, IN. (SQ, MM)
FT. (M)
12
19
28
38
(7741)
(12258)
18064)
(24516)
Local 99% Winter Design Temperature:
17 to 26 degrees F
6
0
55
99
141
8
52
74
111
154
10
NR
90
125
169
15
NR
NR
167
212
20
NR
NR
212
258
30
NR
NR
NR
362
Local 99% Winter Design Temperature:
5 to 16 degrees F*
6
NR
78
121
166
8
NR
94
135
182
10
NR
111
149
198
15
NR
NR
193
247
20
NR
NR
NR
293
30
NR
NR
NR
377
Local 99% Winter Design Temperature:
-10 to 4 degrees F*
6
NR
NR
145
196
8
NR
NR
159
213
10
NR
NR
175
231
15
NR
NR
NR
283
20
NR
NR
NR
333
30
NR
NR
NR
NR
Local 99% Winter Design Temperature:
-11 °F (ld°C)
or
lower
Not recommended
for any vent configuration.
*The 99.6% heating db temperatures
found in the 1997 or 2001 ASHRAE
Fundamentals
Handbook,
Climatic
Design Information
chapter, Table 1A
(United States) and 2A (Canada) or the 2005 ASHRAE Fundamentals
hand-
book, Climatic Design Information
chapter, and the CD-ROM
included with
the 2005 ASHRAE Fundamentals
Handbook.
Air for combustion
must not be contaminated
by halogen
compounds
which include chlorides, fluorides, bromides, and
iodides. These compounds are found in many common home
products
such
as detergent,
paint,
glue,
aerosol
spray,
bleach, cleaning solvent,
salt, and air freshener,
and can
cause corrosion
of furnaces
and vents. Avoid using such
products in the combustion-air
supply. Furnace use during
construction
of the building could cause the furnace to be
exposed to halogen compounds,
causing premature failure of
the furnace or venting system due to corrosion.
Vent dampers on any appliance
connected to the common
vent can cause condensation
and corrosion
in the venting
system.
Do not use vent dampers
on appliances
common
vented with this furnace.
ADDITIONAL VENTING REQUIREMENTS
A 4-in.
(102 mm) round vent elbow is supplied with the
furnace. A 5-in.
(127 mm) or 6-in. (152 mm) vent connector
may be required for some model furnaces. A field-supplied
4-in. (102 mm) to 5-in. (127 mm) or 4-in.
(102 mm) to 6-in.
(152 mm) sheet metal increaser fitting is required when 5-in.
(127 mm) or 6-in.
(152 mm) vent connector
is used. See
Figure 28 - Figure 40 Venting Orientation
for approved vent
configurations.
NOTE:
Vent connector
length for connector sizing starts at
furnace
vent elbow. The 4-in.
(102 mm) vent
elbow
is
shipped for upflow configuration and may be rotated for other
positions. Remove the 3 screws that secure vent elbow to
furnace,
rotate
furnace
vent
elbow
to position
desired,
reinstall screws. The factory-supplied
vent elbow does NOT
count as part of the number of vent connector elbows.
26
441 01 1402 02

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