d. If equipped with permanent, washable 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.
e. If equipped with factory-specified disposable media filter,
replace only with media filter having the same part number
and size.
f. Slide filter into cabinet.
g. Replace filter cabinet door.
h. Turn on electrical supply to furnace.
2. Filters installed in side(s) and/or bottom of blower compart-
ment (See Fig. 2)
a. Disconnect electrical power before removing access doors.
b. Remove blower and control access doors.
c. Release filter retainer from clip at front of furnace casing.
(See Fig. 2.) For side return, clips may be used on either or
both sides of the furnace.
d. Slide filter(s) out.
e. Furnaces are equipped with permanent, washable filters.
Clean filters with tap water. Spray water through filter in
opposite direction of airflow.
f. Rinse and let dry. Oiling or coating of filter is NOT
recommended or required.
g. Reinstall filter(s)
h. Replace blower and control access doors
i. Restore electrical power to furnace.
Step 2—Blower Motor and Wheel
The following items should be performed by a qualified service
technician:
To ensure long life, economy, and high efficiency, clean accumu-
lated dirt and grease from blower wheel and motor annually.
The inducer and blower motors are prelubricated 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 control and blower access doors.
3. Disconnect blower leads from furnace control. Notice wire
color and location for reassembly.
All other factory wires can be left connected, but field
thermostat connections may need to be disconnected depend-
ing on their length and routing.
4. Remove 2 screws securing control and transformer support to
furnace.
5. Hang control box and transformer support to front of furnace
casing.
6. Remove 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. Do not remove or disturb balance weights (clips)
on blower wheel blades. The blower wheel should not be
dropped or bent as balance will be affected.
8. 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:
a. Mark blower wheel location on shaft before disassembly to
ensure proper reassembly.
b. Loosen setscrew holding blower wheel on motor shaft.
NOTE:
Mark blower mounting arms, motor, and blower housing
so motor and each arm is positioned at the same location during
reassembly.
c. Mark blower wheel orientation and cutoff plate location to
ensure proper reassembly.
d. Remove screws securing cutoff plate and remove cutoff
plate from housing.
e. Remove bolts holding motor mounts to blower housing and
slide motor and mounts out of housing. Disconnect capaci-
tor and ground wire attached to blower housing before
removing motor. Motor mount belly band need not be
removed unless motor is to be replaced.
f. Remove blower wheel from housing.
The blower wheel should not be dropped or bend as balance
will be affected.
9. Reassemble motor and blower by reversing items 9a through
9f. Be sure to reattach ground wire.
10. Reinstall blower assembly in furnace.
11. Reinstall control and transformer support assembly in furnace.
12. Reconnect blower leads to furnace control.
Refer to furnace wiring diagram (See Fig. 6), and connect
thermostat leads if previously disconnected.
NOTE:
Refer to Table 1 for motor speed lead relocation if leads
were not identified before disconnection
Heating speed selection MUST be adjusted to provide proper
temperature rise as specified on the rating plate. Failure to
adjust the heating speed may shorten heat exchanger life.
13. Turn on electrical supply. Manually close blower access door
switch. Use a piece of tape to hold switch closed. Check for
proper rotation and speed changes between heating and
cooling by jumpering R to W and then R to Y on furnace
control thermostat terminals.
Blower access door switch opens 115-v power to control
center. No component operation can occur. Caution must be
taken when manually closing this switch for service purposes.
Failure to follow this warning could result in electrical shock,
personal injury, or death.
NOTE:
If thermostat terminals are jumpered before blower
access door switch is closed, blower will run for 90 sec before
beginning a heating or cooling cycle.
TABLE 1—SPEED SELECTOR
COLOR
SPEED
FACTORY-
ATTACHED
TO
Black
High
Cool
Yellow (When
Present)
Medium High
Spare
Blue
Medium Low
Heat
Red
Low
Spare
White
Common
L2/COM
3
