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To prevent condensation
in the limlace
and vent system, the
flHlowing precautions must be observed:
1. Tile return-air temperature must be at least 60°F db except lot
brief periods of time during warn>up fi'om setback at no lower
than 55°F 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 li_rnace and/or venting
system. Derating is permitted only Xoraltitudes above 2(}(}(} It.
3. Adjust the air temperature rise to the uddpoint of the rise range
or slightly above. Low air temperature rise can cause low vent
gas temperature and potential lot condensation problems.
4. Set the thermostat heat anticipator or cycle rate to reduce short
cycling.
Air lot combustion
ulnst not be contaminated
by halogen com-
pounds which include chlorides, fluorides, bromides, and iodides.
These compounds are Xkmndin many common home products such
as detergent, paint, glue, aerosol spray, bleach, cleaning solvent,
salt, and air freshener, and can cause corrosion of limmces 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 lurnace or venting system due to corrosion.
Vent dampers on any appliance connected to the common vent can
cause condensation
and corrosion ilk the venting system. Do not
use vent dampers on appliances common vented with this fl_rnace.
ADDITIONAL
VENTING REQUIREMENTS
A 4" round vent elbow is supplied with the lilrnace. A 5-inch or 6-
inch vent connector may be required Xk_r s ome model furnaces. A
field-supplied
4-inch-to-5-inch
or 4-inch-to-6-inch
sheet metal
increaser fitting is required when 5-inch or 6-inch vent connector
is used. See Fig. 34 46 Venting Orientation
lot approved vent
configurations.
NOTE:
Vent connector
length fl_r connector
sizing starts at
furnace vent elbow. The 4-inch vent elbow is shipped Xi_rupflow
configuration and may be rotated liar other positions. Remove the
3 screws that secure vent elbow to lurnace, 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 tlmmgh one of 5 locations on
the door.
1. Attach the single wall vent connector
to the lilrnace vent
elbow, and fasten the vent connector to the vent elbow with at
least two field-supplied_
corrosion-resistant,
sheet
metal
screws located 18()° apart.
NOTE:
An accessory flue extension KGAFE0112UPH
is avail-
able to extend l]'om 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 18()° apart. Fasten the vent connector to
the flue extension
with at least two lield-supplied,
corrosion-
resistant sheet metal screws located 18()° apart.
2. Vent the furnace with the appropriate connector as shown in
Fig. 34_/-6.
CUT HAZARD
Failure to ff_llow this caution may result ilk personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear
appropriate
protective
clothing,
sali:ty glasses
and
gloves when handling parts and servicing furnaces.
3. Orient the door to determine the correct location of the door
cn{out to be removed.
4. Use aviation-type
tin snips to remove the correct U-shaped
cut-out in door.
NOTE:
Xfthis furnace
is equipped
with knockouts
in the door lk)r
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 IXanging 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
ilk the other
locations
on the door
(top
and
sides),
tin snips can also be used along
the door edges;
however,
the preXi_rred 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 lelX corner of the desired
knockout.
(See
Fig. 51.) Remove
all burrs
and sharp edges.
BURN HAZARD
Failure to XkHlowthis caution may cause personal injury. Hot
vent pipe is within reach of small children when installed in
downflow position.
See the flHlowing instruction.
An accessory Vent Guard Kit, KGAVG01(I1DFG
is REQUXRED
Xk}r d ownlXow applications Xk}r u se where the vent exits through the
lower portion of the furnace casing door. Reli:r to the Vent Guard
Kit lnstructions Xi}rcomplete details.
The horizontal portion of the venting system shall slope upwards
not less than l/4-in, per linear 1i (21 mm/m) from the furnace to the
vent and shall be rigidly supported every 5 IXor less with metal
hangers or straps to ensure there is no movement after installation.
SIDEWALL VENTING
This furnace is not approved Xi_r d irect sidewall horizontal venting.
In the U.S.: Per section 1(}.3.4of the NFGC, any listed mechanical
renter
may be used, when approved by the authority having
jurisdiction.
In Canada:
Per section 7.24.2 of the NSCNGPXC, any listed
renters
may be used, when approved by the authority having
jurisdiction.
Select the listed mechanical renter to match the Btuh input of the
furnace being vented. Follow all manufacturer's
installation
re-
quirements
Xi_rventing and termination
included with the listed
mechanical renter.
29
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