AIRFLOW
Fig. 4ÐHorizontal Filter Arrangement
AIRFLOW 
INSTALLATION
POSITION
OF FILTERS
PLENUM
ACCESS DOOR
A88486
Fig. 5ÐDownflow Filter Arrangement
1.Downflow/Horizontal
Each furnace requires 2 filters which are installed in the
a.Disconnect electrical power before removing blower access door.
b.Remove screw from front of door and remove blower access door.
c.Reach up behind top plate, tilt filters toward center of
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.
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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.
B. 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 screw 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 (when used on 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 reas- sembly.
9.Loosen setscrew(s) holding blower wheel on motor shaft.
10.Remove bolts holding motor mount to blower housing and slide motor and mount out of housing. Disconnect ground wire attached to blower housing before removing motor.
11.Lubricate motor (when oil ports are provided).