User’s Information Manual
10
441 02 2011 00
1. Turn
OFF
power to furnace.
2. Remove compartment door.
3. Reach up above right side of blower, and lift dirty filters out of
rack at top of furnace.
4. Straighten up filters and pull straight down at side of blower.
Pull out through right side of door opening.
5. Inspect the filter(s) and replace or clean washable types. If
filter is aluminum mesh, it should be recoated with filter coat-
ing spray.
6. Reinstall the filters in the filter rack.
7. Reinstall blower compartment door.
8. Turn
ON
electric power to the furnace.
Downflow Filter Replacement
*8DNL
Right Side
Left Side
Figure 9
25--21--16a
External Filter Rack
A plastic end cap is inserted in the filter rack after the filter is
installed. The end cap keeps air from escaping around the open
end of the filter rack. See
Figure 7
for removal of filter.
Filter racks attached to the furnace are made so the filter simply
slides out one end for removal.
1. Turn
OFF
electric power to furnace.
2. Remove the end cap from the filter rack.
3. Slide the filter out of the filter rack.
4. Inspect the filter(s) and replace or clean washable types. If
filter is aluminum mesh it should be recoated with filter coating
spray.
5. Reinstall the end cap in the filter rack.
6. Turn furnace on.
Internally Mounted Filter
1. Turn
OFF
power to furnace.
2. Remove blower door.
3. Slide filter straight out toward you. (See
Figure 8
.)
4. Inspect the filter(s) and replace or clean washable types. If
filter is aluminum mesh it should be recoated with filter coating
spray.
5. Replace blower door
6. Turn on electric power to furnace.
Lubrication
The blower motor and the combustion air blower are prelubricated
by the manufacturer and
DO NOT
require oiling.
Table 1
Recommended Filter Sizes
furnace Size
Heating Input
Nominal Air Flow
Cubic Feet
Recommended Filter Sizes
Sq. In. Surface Area/Nominal Size (inches)
Heating Input
1000 x Btuh
Cubic Feet
per Minute (CFM)
Disposable Filters
Cleanable Filters
50
800--900
500 or 20 x 25
350 or 14 x 25
50, 75, and 100
1100--1300
350 or 14 x 25 (2Req.)
350 or 14 x 25
50, 75, 100, and 125
1300--1500
400 or 16 x 18 (2Req.)
400 or 16 x 18
80, 100, and 125
1500--1700
500 or 20 x 25 (2 Req.)
500 or 20 x 25
125
1900--2100
600 or 20 x 30 (2 Req.)
500 or 20 x 25
150
2300--2500
600 or 20 x 30 (2 Req.)
720 or 24 x 30
Qualified Service Agency Checks
When the furnace is being inspected for condition and operation
have the Qualified Service Agency check the following items.
1. Check all flue gas passages including main and pilot burners,
heat exchanger, and vent.
2. Check electrical wiring and connections.
3.
Check supply and return air ducts for leakage, blockage and
connections to furnace.
4.
Check circulating air blower wheel and motor. Clean them if
required.
5.
Perform an operational checkout on the furnace to be sure
safety controls function and that furnace operates properly.
For additional information, the Qualified Service Agency can
consult the installation instructions for the furnace.
