MAINTENANCE
MAINTENANCE
The furnace owner should have a NOTE: Some filters must be resized
2. 21" - 100,000 BTUH units
professional service company check to fit certain units and applications. require removal of 3-1 /2"
the performance and operation of the {See Figure 42 and Table 25)
segment of filter and frame for
furnace every year. This ensures the
1. 14" - 45,000 and 50,000 BTUH
proper width for a side filter.
furnace owner of receiving the best
units require removal of
3. 24-1/2" -125,000 and 150,000
possible performance and comfort
3-1 /2" segment of filter and
BTUH units require removal of 7"
from the equipment.
A WARNING: DISCONNECT
frame for proper width for a
bottom filter.
segment of filter and frame for
proper width for a side filter.
MAIN ELECTRICAL POWER TO
THE UNIT BEFORE ATTEMPTING
ANY MAINTENANCE. FAILURE TO
TURN OFF ELECTRICAL POWER
FIGURE42
MAY RESULT IN SHOCK CAUSING
RESIZING FIL TEAS & FRAME
PERSONAL INJURY OR DEATH.
FILTERS
0
1. Keep the air filters clean. A new
home may require more frequent
filter attention until dust from
construction is removed.
REMOVE SEGMENT TO SIZE
2. How to clean filters:
AS REQUIRED
Plastic filters - vacuum clean;
UPFLOWFILTERSIZES
wash with detergent and water.
Air dry thoroughly and reinstall.
FURNACE
WIDTH
INPUT
BTUH
SIZE
BOTTOM
SIDE
QTY.
Cardboard and fiberglass -
14"
45&50 12¼' x25" 15¾"
X 25"
1
discard when dirty and replace
17½'
21·
67, 75 & 100
100
15¾"x25"
19¼" x25"
15¾" x25"
15¾" x25"
1
1
with a like-sized similar filter.
24½"
125& 150 22¾" x25' 15¾" x25'
1
3. If using an electronic air filter,
DOWNFLOWFILTERSIZES
remove the filter furnished with
the furnace and follow the main-
FURNACE
WIDTH
INPUT
BTUH
SIZE
QTY.
tenance instructions furnished
14" 45&50 14' X 20"
1
with the electronic air filter.
17½"
21"
67, 75 & 100
100
12"
X 20"
12• x20"
2
2
NOTE: Filters are not
supplied with horizontal
IMPORTANT: DO NOT OPERATE
24½"
125 & 150 14" x20"
2
"only" models.
THE FURNACE WITHOUT
FIL TEAS. Dust entrained with the air
can lodge in the blower wheel, in the
cooling coil fins, in furnace controls,
in air ducts and at the supply
registers. Any recirculated dust
TABLE25
UPFLOW UNIT FILTER SIZE ADJUSTMENT
particles are heated and charred by
FILTERROD LENGTH
APPLICATION
contact with the heat exchanger. This
UNIT
SIZE
UNIT
WIDTH
20-3/4"
AE-61659-02
24-1/4"
AE-61659-03
BOTTOM SIDE
residue soils ceilings, walls, drapes,
45,000
14"
1
- Cutoff3½"
As Is
carpets, and other household articles.
50,000
14"
1
- Cutoff3½" As Is
67,500
17½"
1
- Cutoff 3½" Asls
75,000
17½"
1
- Cutoff 3½" Asls
100,000 17½"
1
- Cutoff 3½" As Is
100,000 21"
1
-
As Is
Cutoff3½'
125,000 24½"
- 1 As Is Cutoff?"
150,000
24½"
-
1 As Is Cutoff?"
51
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