Specifications are subject to change without notice.
37
441 01 4200 01
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
lockout 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.
!
WARNING
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
!
The minimum maintenance on this furnace is as follows:
1. Check and clean/replace air filter each month or more fre-
quently if required. Replace if torn.
2. Check burner inlet elbow opening for cleanliness and any
visible debris. Burner assembly removal should only be
performed for troubleshooting and diagnosis of opera-
tional issues. Refer to troubleshooting and service guide.
3. Check blower motor and wheel for cleanliness each
heating and cooling season. Clean as necessary.
4. Check electrical connections for tightness and controls for
proper operation each heating season. Service as
necessary.
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 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.
Table 18 – Filter Size Information (In. / mm)
FURNACE
CASING
WIDTH
In. (mm)
FILTER SIZE (In. / mm)
FILTER TYPE
Side Return
Bottom Return
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*
* Recommended
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. Remove two screws from blower access door and remove
blower access door.
4. All factory wires can be left connected, but field thermo-
stat connections may need to be disconnected depending
on their length and routing.
5. Remove two screws holding blower assembly to blower
deck and slide blower assembly out of furnace.
6. 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.
7. Vacuum any loose dust from blower housing, wheel and
motor.
8. If a greasy residue is present on blower wheel, remove
wheel from the blower housing and wash it with an appro-
priate 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.
9. Reassemble motor and blower by reversing steps 9d
finishing with 9a. Be sure to reattach ground wire to the
blower housing.
a. Disconnect power choke wires (if used) 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.
10. 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 neces-
sary.
11. Spin the blower wheel by hand to verify that the wheel
does not rub on the housing.
12. Reinstall blower assembly in furnace.
