8
* Factory provided with the furnace. Filters may be field modified by cutting
filter material and support rods (3) in filters. Alternate sizes and additional
filters may be ordered from your dealer.
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 improper performance. Build-
ups on the main burners can cause faulty firing. This “delayed
ignition’’ is characterized by an alarmingly loud sound. If
your furnace makes a loud noise when the main burners are
ignited, shut down the furnace and call your servicing dealer.
Use your flashlight and follow these steps for inspecting the
combustion area and vent system of your furnace:
1. Turn off electrical supply to the furnace and remove
the access doors. (See Fig. 9, and 10 or 11.)
2. Carefully inspect the gas burner for dirt, rust, or scale
(see Fig. 29). Inspect the relief box, flue connection
area, and the vent pipe for rust.
29
NOTE:
If dirt, rust, soot, or scale accumulations are found, call
your servicing dealer. DO NOT OPERATE THE FURNACE.
30
31
32
DOWNFLOW/HORIZONTAL FURNACE FILTER TABLE
FURNACE CAS-
ING WIDTH (IN.) FILTER SIZE (IN)
FILTER
TYPE
14-3/16 (2) 16 x 20 x 1* Cleanable
17-1/2 (2) 16 x 20 x 1* Cleanable
21 (2) 16 x 20 x 1* Cleanable
24-1/2 (2) 16 x 20 x 1* Cleanable
CAUTION
Use care when cutting support rods in filters to
protect against flying pieces and sharp rod ends.
Wear safety glasses, gloves, and appropriate pro-
tective clothing. Failure to follow this caution
could result in personal injury.
!
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