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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 db except for
brief periods of time during warm-up from 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 furnace and/or venting
system. Derating is permitted only for altitudes above 2000 ft.
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 com-
pounds 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" round vent elbow is supplied with the furnace. A 5-inch or 6-
inch vent connector may be required for some 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 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.
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NOTE: An accessory flue extension KGAFE0112UPH is avail-
able 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.
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CUT HAZARD
Failure to follow this caution may result in personal injury.
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 U-shaped
cut-out in door.
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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.
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BURN HAZARD
Vent pipe is HOT and may cause personal injury. 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 1/4-in. per linear ft (21 mm/m) from the furnace to the
vent and shall be rigidly supported every 5 ft 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 10.3.4 of the NFGC, any listed mechanical
venter may be used, when approved by the authority having
jurisdiction.
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In Canada: Per section 7.24.2 of the NSCNGPIC, 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 re-
quirements for venting and termination included with the listed
mechanical venter.
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