International comfort products N8MXL Installation Instructions Manual page 40

For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed
on this equipment. Consult your local dealer about proper
frequency of maintenance and the availability of a
maintenance contract.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in
personal injury, death or property damage.
Turn off the gas and electrical supplies to the unit
and install a lock out tag before performing any
maintenance or service. Follow the operating
instructions on the label attached to the furnace.
WARNING
!
CARBON MONOXIDE POISONING AND
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never operate unit without a filter or with filter access
door removed.
CAUTION
!
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.
The minimum maintenance on this furnace is as follows:
1. Check and clean/replace air filter each month or more
frequently if required. Replace if torn.
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 sea-
son for rust, corrosion, soot or excessive dust. If neces-
sary, 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 recom-
mended in the accessory instructions.
CLEANING AND/OR REPLACING AIR FILTER
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.
40
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.
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
4. Remove two 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 two 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 motor, and blower
housing so motor and each arm is positioned at the same
location during reassembly.
a. Disconnect power choke wires (if used) and ground
b. Remove screws securing cutoff plate and remove
c. Loosen set screw holding blower wheel on motor shaft
d. Remove bolts holding motor to blower housing and
e. Remove blower wheel from housing.
f. Clean wheel and housing.
Specifications are subject to change without notice.
WARNING
!
within furnace.
wire attached to blower housing.
cutoff plate from housing.
(160+/−20 in.−lb. when reassembling).
slide motor out of wheel (40+/−10 in.−lb. when reas-
sembling).
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