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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 ° C)db except for brief periods
of time during
warm-up
from setback
at no lower than 55°F (13°C)
db or during
initial start-up
from a standby
condition.
2. Adjust
the gas input
rate per the installation
instructions.
Low
gas
input
rate
causes
low
vent
gas temperatures,
causing
condensation
and corrosion
in the furnace
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 the thermostat
heat anticipator
or cycle rate to reduce
short cycling.
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" (101 mm) round vent elbow
is supplied
with the furnace.
A
5-inch
(127 mm) or 6- inch (152 mm) vent connector
may be
required
for
some
model
furnaces.
A
field-supplied
4-inch-to-5-inch
(101 - 127 mm) or 4-inch-to-6-inch
(101 -
152 mm)
sheet
metal
increaser
fitting
is required
when
5-inch
(127 mm) or 6-inch
(152 mm) vent connector
is used.
See Fig.
34-46
Venting
Orientation
for approved
vent configurations.
NOTE:
Vent
connector
length
for connector
sizing
starts
at
furnace vent elbow. The 4-inch
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.
The vent connector
can exit the door through
one of 5 locations
on the door.
1. Attach
the single wall vent connector
to the furnace
vent
elbow,
and fasten
the vent
connector
to the vent
elbow
with at least two field-supplied,
corrosion-resistant,
sheet
metal screws located
180 ° apart.
NOTE:
An
accessory
flue
extension
KGAFE0112UPH
is
available
to extend from the furnace
elbow to outside
the furnace
casing.
If flue extension
is used,
fasten the flue extension
to the
vent elbow
with
at least two field-supplied,
corrosion-resistant,
sheet metal screws
located
180 ° apart. Fasten
the vent connector
to the flue extension
with
at least two field-supplied,
corrosion
resistant
sheet metal screws
located
180 ° apart.
2. Vent the furnace
with the appropriate
connector
as shown
in Fig. 34-46,
CUT HAZARD
Failure to follow this caution may result in personal iniury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
3. Orient
the door to determine
the correct
location
of the
door cutout
to be removed.
4. Use
aviation-type
tin
snips
to
remove
the
correct
[]-shaped
cut-out
in door.
NOTE:
If this furnace
is equipped
with
knockouts
in the door
for the vent, a number
of techniques
can be used to remove
these
knockouts
as seen in Fig. 47 through
51. The knockout
in the
bottom
of the door is unique
due to its flanging
and is not easily
removed
by first cutting
the two tie points at the edge of the door,
using aviation-type
tin snips. (See Fig. 47.) A sharp blow to the
rounded
end of the knockout
(See Fig. 48.) will separate
more tie
points
and allow the knockout
to be pulled
loose.
(See Fig. 49.)
Remove
all burrs and sharp edges. For the knockouts
in the other
locations
on the door (top and sides),
tin snips
can also be used
along
the door edges;
however,
the preferred
method
is to use a
hammer
and screwdriver
to strike
a sharp
blow
(See
Fig. 50.)
directly
to the knockout
tie points
or use a hammer
in the upper
left corner
of the desired
knockout.
(See
Fig. 51.) Remove
all
burrs and sharp edges.
BURN
HAZARD
Failure to follow this caution may cause personal iniury.
Hot vent pipe is within reach of small children when
installed
in
downflow
position.
See
the
following
instruction.
An accessory
Vent Guard
Kit, KGAVG0101DFG
is REQUIRED
for downflow
applications
for use where
the vent exits through
the lower
portion
of the furnace
casing
door.
Refer
to the Vent
Guard
Kit Instructions
for complete
details.
The horizontal
portion
of the venting
system
shall slope upwards
not less than l/4-in,
per linear ft. (21 mm/M)
from the furnace
to
the vent and shall be rigidly
supported
every
5 ft. (2 M) or less
with metal hangers
or straps to ensure
there is no movement
after
installation.
SIDEWALL
VENTING
This
furnace
is not
approved
for
direct
sidewall
horizontal
venting.
In
the
U.S.:
Per
section
12.4.3.1
of
the
NFPA54/ANSI
Z223.1-2006,
any listed
mechanical
venter
may be used,
when
approved
by the authority
having jurisdiction.
In Canada:
Per
section
8.24.2
of the CAN/CSA-BI49.1-05,
any listed venters
may be used, when
approved
by the authority
having jurisdiction.
Select the listed mechanical
venter
to match the Btuh input of the
furnace
being
vented.
Follow
all
manufacturer's
installation
requirements
for venting
and termination
included
with the listed
mechanical
venter.
30
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