Specifications are subject to change without notice.
441 01 3700 00
43
CARBON MONOXIDE POISONING AND FIRE
HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never operate furnace 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 air filter each month or more frequently if
required. Replace if torn.
2. Check blower motor and wheel for cleanliness each heat-
ing and cooling season. Clean as necessary.
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as neces-
sary.
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 sea-
son 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 ac-
cessory instructions.
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
!
Media cabinet filter procedures:
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 3/4--in. (19 mm)
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 Ta-
ble 13 for size information.
5. If equipped with factory--specified disposable media filter,
replace only with media filter having the same part num-
ber and size. For expandable replacement media, refer to
the instructions included with the replacement media.
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.
Table 13 – Filter Size Information -- In. (mm)
FURNACE
CASING
WIDTH
FILTER SIZE
FILTER
TYPE
SIDE
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
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 access
door:
a. Disconnect vent connector from furnace vent elbow.
b. Disconnect and remove short piece of vent pipe from
within furnace.
4. Remove screws from blower access door and remove
blower access door.
5. All factory wires can be left connected, but field thermo-
stat connections may need to be disconnected depending
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 appro-
priate 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 cut-
off plate from housing.
c. Loosen set screw holding blower wheel on motor shaft
(160+/--20 in.--lb. when assembling).