48
2. Check blower motor and wheel for cleanliness each heating
and cooling season. Clean as necessary.
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as necessary.
4. Inspect burner compartment before each heating season for
rust, corrosion, soot or excessive dust. If necessary, have furnace
and burner serviced by a qualified service agency.
5. Inspect the vent pipe/vent system before each heating season
for rust, corrosion, water leakage, sagging pipes or broken
fittings. Have vent pipes/vent system serviced by a qualified
service agency.
6. Inspect any accessories attached to the furnace such as a
humidifier or electronic air cleaner . Perform any service or
maintenance to the accessories as recommended in the accessory
instructions.
CLEANING AND/OR REPLACING AIR FIL
TER
The air filter arrangement will vary depending on the application.
The filter is exterior to the furnace casing.
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
!
Media cabinet filter procedures:
NOTE: Media cabinet or 1 in. filter rack are accessories and are
not included from the factory with standard furnace model.
1. Turn off electrical supply to furnace before removing filter
access door.
2. Remove filter cabinet door.
3. Slide filter out of cabinet.
4. If equipped with permanent, washable 1--inch filter, clean filter
by spraying cold tap water through filter in opposite direction of
airflow. Rinse filter and let dry. Oiling or coating of the filter is
not recommended. See Table 11 for size information.
5. If equipped with factory--specified disposable media filter ,
replace only with media filter having the same part number and
size. For expandable replacement media, refer to the instructions
included with the replacement media. If equipped with accessory
KGAFR0301ALL external filter rack, See Table 11.
6. Slide filter into cabinet.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.
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. Loosen the thumbscrew on outer door and remove outer
door.
3. For downflow or horizontal furnaces having vent pipes
within the furnace that pass in front of the blower access
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 remove
blower access door.
5. Disconnect blower leads from furnace control. Record
wire color and location for reassembly . All other factory
wires can be left connected, but field thermostat
connections may need to be disconnected depending on
their length and routing.
6. Remove 2 screws holding control box to blower shelf.
7. Hang control box from front of furnace casing and away
from blower compartment.
8. Remove 2 screws holding blower assembly to blower
deck and slide blower assembly out of furnace.
9. 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.
10. Vacuum any loose dust from blower housing, wheel and
motor.
11. If a greasy residue is present on blower wheel, remove
wheel from the blower housing and wash it with an
appropriate degreaser. To remove wheel:
NOTE: Before disassembly, mark blower motor, and blower
housing so motor and each arm is positioned at the same location
during reassembly.
a. Disconnect capacitor wires and 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 reassembling).
d. Remove bolts holding motor to blower housing and
slide motor out of wheel (40+/--10 in.-- lb. when
reassembling).
e. Remove blower wheel from housing.
f. Clean wheel and housing.
12. Reassemble motor and blower by reversing steps 11f
through 11a, finishing with 11a. Be sure to reattach
ground wire to the blower housing.
13. 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 reposition if
necessary.
14. Spin the blower wheel by hand to verify that the wheel
does not rub on the housing.
15. Reinstall blower assembly in furnace.
58ST
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