Carrier 58GP - Combustion and Vent System Inspection

3. Inspect the filter.
4. If you have a dirty disposable filter, replace it with a
new one. See Furnace Filter Table for replacement fil¬
ter size. If you have a dirty reusable filter, wash it in a
sink or tub; or use an outside garden hose to clean it.
Always use cold water. . . and a mild liquid detergent,
if necessary. Flush the filter from the side opposite of
accumulated dirt. Then, allow the filter to air dry.
After the reusable filter is dry, reinstall it with its
cross-mesh binding side facing the furnace blower.
UPFLOW FURNACE ONLY: Replace the filter
retainer under the flange of the furnace casing.
5. Replace the access door(s) and restore electrical power
to the furnace.
A CAUTION
Never operate your furnace without a filter. An accu¬
mulation of dust or lint on internal parts can cause a
loss of efficiency, and damage to the blower motor and
air conditioning system (when used.)
NOTE: Refer to the unit Installation Instructions for
blower motor oiling information if oil ports are provided.
FURNACE FILTER TABLE
INSPECT COMBUSTION AREA AND VENT SYSTEM
Inspect the combustion area and vent system before each
heating season. An accumulation of dirt, soot, or rust can
mean a loss of efficiency and unsafe performance. Buildups
on the burners can cause faulty firing. This “delayed igni¬
tion” is characterized by an alarmingly loud sound. If your
furnace makes a loud noise when the burners are ignited by
the pilot, shut down the furnace—and call your servicing
dealer. Refer to the lighting/operating instruction label
affixed to your furnace blower access door (See Figs. 1 and 2
for door identification) for shutdown procedures.
Use your flashlight and follow these steps for inspecting the
combustion area and vent system of your furnace:
1. Turn off the electrical supply to the furnace and
remove the access door(s). See Figs. 9 and 10 or 11. The
blower access door must be installed to permit furnace
operation. On downflow furnaces, the blower access
door must be removed before the control access door is
removed, then reinstalled.
2. Carefully inspect the burner and the pilot areas for dirt,
rust, or scale. See Fig. 25. Then, inspect the vent con¬
nection area, and the vent pipe for rust.
NOTE: If dirt, rust, soot, or scale accumulations or other
discrepancies are found, call your servicing agency.
3. I nspect the vent pipe for a sag, holes, obstruction, or a
disconnection. Horizontal vent pipes must slope
upward at least 1/4 inch per linear foot away from the
furnace.
A WARNING
If holes are found—or if the vent pipe is obstructed, or
is not connected—toxic fumes can escape into your
home. DO NOT OPERATE YOUR FURNACE. Call
your service technician immediately.
UPFLOW FURNACE
FILTER SIZE
FILTER
CASING WIDTH (INCHES) TYPE
14-3/16 15-7/8 x 27-3/4 Cleanable
17-1/2
15-7/8 x 27-3/4
Cleanable
21 19-3/8x27-3/4 Cleanable
24-1/2 22-7/8 x 27-3/4 Cleanable
31-1/2 29-7/8 x 27-3/4 Cleanable
DOWNFLOW FURNACE FILTER FILTER
CASING WIDTH (INCHES)
TYPE
14-3/16 & 17-1/2 16 x 20 (two each)
Disposable
21 & 24-1/2 16 x 20 (two each) Cleanable
Refer to the lighting/operating instruction label affixed to
your furnace blower access door for shutdown procedures.
4. Replace the access door and restore electrical power to
the furnace. See Fig. 15 or 16. On downflow furnaces,
remove the blower access door, install the control
access door, then reinstall the blower access door.
5. Start the furnace and observe its operation. If possible,
watch the burner flames. See Fig. 25. Are they burning
bright blue? If not (or if you suspect some other mal¬
function), call your servicing dealer.
Refer to the lighting/operating instruction label affixed to
your furnace blower access door for shutdown procedures.
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