44
441 01 2121 01
Table 16 – Filter Size Information − In. (mm)
FURNACE CASING WIDTH
FILTER SIZE
FILTER TYPESIDE
RETURN
BOTTOM
RETURN
14−1/2 (368)
16 X 25 X 3/4
(406 X 635 X 19)
14 X 25 X 3/4
(356 X 635 X 19)
Washable*
17−1/2 (445)
16 X 25 X 3/4
(406 X 635 X 19)
16 X 25 X 3/4
(406 X 635 X 19)
Washable*
21 (533)
16 X 25 X 3/4
(406 X 635 X 19)
20 X 25 X 3/4
(508 X 635 X 19)
Washable*
24 (610)
16 X 25 X 3/4
(406 X 635 X 19)
24 X 25 X 3/4
(610 X 635 X 19)
Washable*
* Recommended
Cleaning and/or Replacing Air Filter
The air filter arrangement will vary depending on the
application.
NOTE: If the filter has an airflow direction arrow, the arrow
must point towards the blower.
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
CAUTION
!
Blower Motor and Wheel
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Blower access door switch opens 115−v power to
control. No component operation can occur unless
switch is closed. Caution must be taken when
manually closing this switch for service purposes.
!
WARNING
NOTE: The blower wheel should not be dropped or bent as
balance will be affected.
The following steps should be performed by a qualified
service agency.
To ensure long life and high efficiency, clean accumulated dirt
and grease from blower wheel and motor annually.
The inducer and blower motors are pre−lubricated and
require no additional lubrication. These motors can be
identified by the absence of oil ports on each end of the
motor.
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove outer door.
3. For downflow or horizontal furnaces having vent pipes
within the furnace that pass in front of the blower ac-
cess door:
a. Disconnect vent connector from furnace vent elbow.
b. Disconnect and remove short piece of vent pipe
from within furnace.
4. Remove 2 screws from blower access door and re-
move blower access door.
5. All factory wires can be left connected, but field thermo-
stat connections may need to be disconnected de-
pending on their length and routing.
6. Remove 2 screws holding blower assembly to blower
deck and slide blower assembly out of furnace.
7. Clean blower wheel and motor using a vacuum with
soft brush attachment. Blower wheel blades may be
cleaned with a small paint or flux brush. Do not remove
or disturb balance weights (clips) on blower wheel
blades.
8. Vacuum any loose dust from blower housing, wheel
and motor.
9. If a greasy residue is present on blower wheel, remove
wheel from the blower housing and wash it with an ap-
propriate degreaser. To remove wheel:
NOTE: Before disassembly, mark blower mounting arms,
motor, and blower housing so motor and each arm is
positioned at the same location during reassembly.
a. Disconnect ground wire attached to blower housing.
b. Remove screws securing cutoff plate and remove
cutoff plate from housing.
c. Loosen set screw holding blower wheel on motor
shaft (160+/−20 in.−lb. when assembling).
d. Remove bolts holding motor to blower housing and
slide motor out of wheel (40+/−10 in.−lb. when reas-
sembling).
e. Remove blower wheel from housing.
f. Clean wheel and housing.
10. Reassemble motor and blower by reversing steps 9a,
through 9e. Be sure to reattach ground wire to the
blower housing.
11. Verify that blower wheel is centered in blower housing
and set screw contacts the flat portion of the motor
shaft. Loosen set screw on blower wheel and reposi-
tion if necessary.
12. Spin the blower wheel by hand to verify that the wheel
does not rub on the housing.
13. Reinstall blower assembly in furnace.
14. Reinstall 2 screws securing blower assembly to blower
deck.
15. Reconnect blower leads to furnace control. Refer to fur-
nace wiring diagram, and connect thermostat leads if
previously disconnected.
16. To check blower for proper rotation:
a. Turn on electrical supply.
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