6
FURNACE CASING WIDTH
IN (MM)
FILTER QUANTITY AND SIZE *
**
FILTER TYPE*
SIDE RETURN
IN (MM)
BOTTOM RETURN
IN (MM)
14---1/2 (368)
(1) 16 x 25
(406 x 635)
(1) 14 x 25
(356 x 635)
3/4” (19 mm) thick washable or
4---5/16” (110 mm) thick
media---type
17---1/2 (445)
(1) 16 x 25
(406 x 635)
(1) 16 x 25
(406 x 635)
3/4” (19 mm) thick washable or
4---5/16” (110 mm) thick
media---type
21 (533 )
(1) 16 x 25
(406 x 635)
(1) 20 x 25
(508 x 635)
3/4” (19 mm) thick washable
or 4---5/16” (100 mm) thick
media---type
24 (610)
(1) 16 x 25
(406 x 635)
(1) 24 x 25
(610 x 635)
3/4” (19 mm) thick washable or
4---5/16” (100 mm) thick
media---type
*Recommended
**Some furnaces may have 2 filters
d. a washable filter, wash filter (if dirty) in sink, bathtub,
or outside with a garden hose. Always use cold tap
water. A mild liquid detergent may be used if necessary.
Spray water through filter in the opposite direction of
airflow. Allow filter to dry.
5. Reinstall clean air filter.
6. Replace filter cabinet door.
7. Turn on electrical supply to furnace (See Fig. 10).
NOTE
: If side return ducts are used, 2 filters may be required in
some models. The procedure listed above may be used to remove
side filters.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Use care when cutting support rods in filters to protect against
flying pieces and sharp rod ends. Wear safety glasses, gloves,
and appropriate protective clothing.
CAUTION
!
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
UNIT OPERATION HAZARD
Failure to follow this caution may result in personal injury.
Failure to follow this warning could result in personal injury
or death.
For proper and safe operation the furnace needs air for
combustion and ventilation. Do not block or obstruct air
openings on the furnace, air opening to the area in which the
furnace is installed, and the space around the furnace.
CAUTION
!
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 firing. This “delayed ignition” is
characterized by an alarmingly loud sound.
NOTE
: 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 door. (See Fig. 5 and 6.)
2. Carefully inspect the gas burner for dirt, rust, or scale.
Inspect the elbow, flue connection area, and the vent pipe
for rust.
A92330
Fig. 13 -- Burner Flame
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
If dirt, rust, soot, or scale accumulations are found, call
your dealer. Do not operate your furnace.
!
WARNING
3. Inspect the vent pipe for a sag, holes, or a disconnection. A
horizontal vent pipe must slope upward away from furnace.
If rusty joints or seams, or signs of water leakages are
found, call your dealer for service.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death.
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 dealer for service.
!
WARNING
