9
440 02 7000 02
Specifications subject to change without notice.
FURNACE CASING WIDTH
IN (MM)
FILTER QUANTITY AND SIZE *
FILTER TYPE*
SIDE RETURN
IN (MM)
BOTTOM RETURN
IN (MM)
17-1/2 (445)
(1) 16 x 25 x
w
(406 x 635 x 19)
(1) 16 x 25 x
w
(406 x 635 x 19)
w
” (19 mm) thick cleanable
21 (533 )
(1) 16 x 25 x
w
(406 x 635 x 19)
(1) 20 x 25 x
w
(508 x 635 x 19)
w
” (19 mm) thick cleanable
24-1/2 (610)
(1) 16 x 25 x
w
(406 x 635 x 19)
(1) 24 x 25 x
w
(610 x 635 x 19)
w
” (19 mm) thick cleanable
*
Filters with a side return
−
air may have a different filter size. Measure the filter to obtain the correct size.
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
!
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
!
Visually inspect the combustion area and vent system before each
heating season. Make sure that all PVC pipes leading into the
combustion area and vent are free from any cracks and sags. 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.
Check the combustion
−
air intake adjacent to the furnace or outside
your home for blockage. Also check the vent pipe on the outside of
your home for blockage.
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
main furnace door. (See Figure 20 and Figure 21)
2. Remove burner enclosure front Figure 27 & Figure 28.
Figure 27
Upflow burner enclosure
Figure 28
Downflow burner enclosure
3. Inspect the combustion
−
air and vent PVC pipes for sags,
holes, cracks, water leaks, blockage or disconnections. Hori-
zontal portions of vent pipe must slope downward toward
the furnace.
Figure 29
Burner Flame
4. Reinstall burner enclosure front.
5. If your furnace is free of the above conditions, replace main
furnace door and turn on electrical and gas supplies to the
furnace.
6. Start your furnace and observe its operation. Watch the
burner flames to see if they are clear blue, almost transpar-
ent. (See Figure 29). If you observe a suspected malfunc-
tion, or the burner flames are not clear blue, call your dealer.
