Filter
Top Products
8
9. Replace blower access door and
secure with 2 screws. Turn on
electrical supply to the furnace.
(See Fig. 18.)
* Filter 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. Buildups on
the main burners can cause faulty fir-
ing. This “delayed ignition’’ is charac-
terized 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 the electrical supply to
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.
NOTE:
If dirt, rust, soot, or scale accu-
mulations are found, call your servic-
ing dealer. DO NOT OPERATE THE
FURNACE.
3. Inspect the vent pipe for a sag,
holes, or a disconnection. A hori-
zontal vent pipe must slope
upward. If rusty joints or seams,
or signs of water leakages are
found, call your dealer for service.
29
30
31
32
33
34
UPFLOW FURNACE
AIR FILTER TABLE (IN.)
AIR FILTER LOCATED IN BLOWER
COMPARTMENT
FUR-
NACE
CASING
WIDTH
FILTER SIZE
FILTER
TYPE
Side
Return
Bottom
Return
14-3/16 (1) 16 x 25 x 1* (1) 14 x 25 x 1 Cleanable
17-1/2 (1) 16 x 25 x 1* (1) 16 x 25 x 1* Cleanable
21 (1) 16 x 25 x 1 (1) 20 x 25 x 1* Cleanable
24-1/2 (1 or 2) 16 x 25 x 1(1) 24 x 25 x 1* Cleanable
AIR FILTER LOCATED IN
FILTER CABINET
FILTER
CABINET
HEIGHT (IN)
FILTER
SIZE (IN)
FILTER
TYPE
16
(1) 16 x 25 x 1*
or (1) 16 x 25 x 4-5/16
Cleanable
Disposable
20
(1) 20 x 25 x 1*
or (1) 20 x 25 x 4-5/16
Cleanable
Disposable
24
(1) 24 x 25 x 1*
or (1) 24 x 25 x 4-5/16
Cleanable
Disposable
DOWNFLOW
FURNACE FILTER TABLE (IN.)
FURNACE
CASING
WIDTH
FILTER
SIZE
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 appropri-
ate protective clothing. Failure
to follow this caution could re-
sult in personal injury.
!