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. 32–44.
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.
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. 27 through 31. 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. 27.) A sharp blow to the
rounded end of the knockout (See Fig. 28.) will separate more tie
points and allow the knockout to be pulled loose. (See Fig. 29.)
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. 30.) directly to the knockout tie points or
use a hammer in the upper left corner of the desired knockout. (See
Fig. 31.) Remove all burrs and sharp edges.
BURN HAZARD
Failure to follow this caution 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.
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.
START-UP, ADJUSTMENT, AND SAFETY CHECK
Step 1—General
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
This furnace is equipped with manual reset limit switches in
the gas control area. The switches open and shut off power to
the gas valve if a flame rollout or overheating condition
occurs in the gas control area. DO NOT bypass the switches.
Correct inadequate combustion air supply problem before
resetting the switches.
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.
1. Maintain 115-v wiring and ground. Improper polarity will
result in rapid flashing LED and no furnace operation.
2. Make thermostat wire connections at the 24-v terminal block
on the furnace control. Failure to make proper connections
will result in improper operation. (See Fig. 25.)
3. Gas supply pressure to the furnace must be greater than 4.5-in.
wc (0.16 psig ) but not exceed 14-in. wc (0.5 psig ).
4. Check all manual-reset switches for continuity.
5. Install blower compartment door. Door must be in place to
operate furnace.
6. Replace outer door.
Fig. 30—Hammer and Screwdriver Used for Knock-
out
A04130
Fig. 31—Remove Knockout with Hammer
A04131
27
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