MOUNTING
SCREWS
DRAFT
SAFEGUARD
SWITCH
FLUE
RELIEF
COLLECTOR
BOX
BOX
GAS
VALVE
PILOT
CONTROL
BOX
SPEED
SELECTOR
FILTER
RETAINER
WASHABLE
FILTER
A92178
Fig. 4—Model 394HAD Upflow
b. Remove blower and control access doors.
c. Release filter retainer from clip at front of furnace
casing. (See Fig. 4.) For side return, clips may be used on
either or both sides of the furnace.
d. Slide filter 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.
h. Replace 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).
Remember to disconnect the electrical supply before removing
access doors.
Clean and lubricate as follows:
1. Remove 2 screws from blower access door (downflow
furnace only). Remove blower access door.
2. Remove vent pipe enclosure (downflow furnace only) and
disconnect short piece of vent pipe from relief box.