Filter
Top Products
Never operate unit without a filter or with filter access door
removed. A failure to follow this warning could result in fire,
personal injury, or death.
1. Downflow/Horizontal
Each furnace requires 2 filters which are installed in the
return-air duct. (See Fig. 4 and 5.) To remove filters for
cleaning or replacement, proceed as follows:
a. Disconnect electrical power before removing blower access
door.
b. Remove 2 screws from front of door and remove blower
access door.
c. Reach up behind top plate, tilt filters toward center of
return-air plenum, remove filters, and clean as needed.
Replace if torn.
d. Furnaces are equipped with permanent, washable filters.
Clean filters with tap water. Spray water through filter in
opposite direction of airflow.
e. Rinse and let dry. Oiling or coating of filters is not
recommended or required.
f. Reinstall filters.
g. Replace blower access door.
h. Restore electrical power to furnace.
2. Upflow
Each furnace requires 1 or 2 filters which are installed in the
blower compartment. (See Fig. 6.) To remove filters for
cleaning or replacement, proceed as follows:
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. 6.) 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.
BLOWER MOTOR AND WHEEL
For long life, economy, and high efficiency, clean accumulated dirt
and grease from the blower wheel and motor annually.
The following steps should be performed by a qualified service
technician.
Some motors have prelubricated sealed bearings and require no
lubrication. These motors can be identified by the absence of oil
ports on each end of the motor. For those motors with oil ports,
lubricate motor every 5 years if motor is used on intermittent
operation (thermostat FAN switch in AUTO position), or every 2
years if motor is in continuous operation (thermostat FAN switch
in ON position).
NOTE: Remember to disconnect the electrical supply before
removing access doors.
Clean and lubricate as follows:
1. Remove 2 screws from blower access door
(downflow/horizontal furnace only) and remove blower access
door.
2. Remove vent pipe enclosure (downflow/horizontal furnace
only) and disconnect short piece of vent pipe from relief box.
3. Disconnect wires from auxiliary limit on blower housing
(downflow/horizontal furnace only).
4. Remove control.
5. Disconnect electrical leads from control. (See Fig. 6 or 7.)
Note location of wires for reassembly.
6. Remove screws holding blower assembly to blower deck and
slide blower assembly out of furnace.
7. Loosen screw in strap holding motor capacitor to blower
housing and slide capacitor out from under strap.
8. Mark blower wheel, motor, and motor support in relation to
blower housing before disassembly to ensure proper reassem-
bly.
Fig. 4—Horizontal Filter Arrangement
A94307
AIRFLOW
Fig. 5—Downflow Filter Arrangement
A88486
RETURN-AIR
PLENUM
AIRFLOW
ACCESS DOOR
INSTALLATION
POSITION
OF FILTERS
3