18
■
Typical filter sizes are shown; however, any combination of filters whose area equals or exceeds the minimum area shown is
satisfactory.
If a central return air filter-grille is used, the furnace does not
require a filter.
To install a filter at the furnace only, use the following kits:
■
AFILT524 for side return on upflow installations.
■
AFILT529 for bottom return on upflow furnace installations.
■
WAFILTHA7 for single side return in installations requiring
more than 1,600 CFM nominal air delivery.
Make Electrical Connections
Thermostat
Install a room thermostat according to the instructions furnished
with it. Select a location on an inside wall that is not subject to
drafts, direct sunshine, or other heat sources.
Make the low voltage thermostat connections to the ignition
control board as indicated on the Wiring Connection Diagram in
“Troubleshooting.”
1. Disconnect power.
2. Remove the screw from the furnace electrical connection
box.
3. Remove the cover from the furnace electrical connection box.
4. Route the field supply wires to the furnace electrical
connection box.
5. Using UL listed wire connectors, connect the field supply
wires to the furnace (black to black and white to white).
6. Connect ground wire to green ground screw.
Minimum Filter Requirements Chart
Disposable Filters
Cleanable Filters
Airflow
Descriptor
Minimum Area—
sq. in. (cm
2
)
Size—in. (cm)
Quantity
Minimum Area—
sq. in. (cm
2
)
Size—in. (cm)
Quantity
09
480 (3,096.8)
20 x 25 (50.8 x 63.5)
1
240 (1,548.4)
16 x 20 (40.6 x 50.8)
1
10
480 (3,096.8)
20 x 25 (50.8 x 63.5)
1
240 (1,548.4)
16 x 20 (40.6 x 50.8)
1
12
576 (3,716.1)
16 x 20 (40.6 x 50.8)
2
288 (1,858.1)
16 x 20 (40.6 x 50.8)
1
14
672 (4,335.5)
20 x 20 (50.8 x 50.8)
2
336 (2,167.7)
20 x 20 (50.8 x 50.8)
1
16
768 (4,954.8)
20 x 20 (50.8 x 50.8)
2
384 (2,477.4)
20 x 20 (50.8 x 50.8)
1
20, 22
960 (6,193.5)
20 x 25 (50.8 x 63.5)
2
480 (3,096.8)
20 x 25 (50.8 x 63.5)
1
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
WARNING
Electrical Shock Hazard
Electrically ground furnace.
Connect ground wire to green ground screw.
Failure to do so can result in death or electrical shock.
