WARNING:
Never operate unit without a filter(s) or
with filter access door removed. A failure to follow this
warning could result in fire, personal injury, or death.
1. Downflow
Each furnace requires 2 filters which are installed in the
return-air duct. (See Fig. 4.) To remove filters for cleaning
or replacement, proceed as follows:
a. Turn off electrical supply before removing blower access
door.
b. Remove blower access door.
c. Reach up behind top plate, tilt filters toward center of
return-air plenum, remove filters. Replace filters if torn
or damaged.
d. Furnaces are equipped with permanent, washable filters.
e. Clean filters by spraying tap water through filter from
opposite direction of airflow.
f. Rinse and let dry. Oiling or coating of filters is not
recommended or required.
g. Reinstall filters.
h. Replace blower access door and turn on electrical supply
to furnace.
2. Upflow/Horizontal.
Each furnace requires 1 or 2 filters which are installed in the
blower compartment. (See Fig. 5.) To remove filters for
cleaning or replacement, proceed as follows:
a. Turn off electrical supply before removing blower and
control access doors.
b. Release filter retainer from clip at front of furnace
casing. (See Fig. 5.) For side return, clips may be used
on either or both sides of the furnace.
c. Slide filter out.
d. Clean filters by spraying tap water through filter from
opposite direction of airflow.
e. Rinse and let dry. Oiling or coating of filter is not
recommended or required.
f. Place filter in furnace.
g. Replace blower and control access doors and turn on
electrical supply to furnace.
B.
Blower Motor and Wheel
For long life, economy, and high efficiency, clean accumulated dirt
and grease from blower wheel and motor annually.
The following steps should be performed by a qualified service
technician:
The motors have prelubricated sealed bearings and require no
lubrication.
Remember to disconnect the electrical supply before removing
access doors.
Clean as follows:
1. Remove blower access door.
2. Disconnect vent pipe on downflow furnace only.
a. Remove vent pipe enclosure.
b. Disconnect vent pipe and remove short piece of pipe
from furnace.
c. Disconnect wires from auxiliary limit on blower housing
(if present).
3. Disconnect blower electrical leads from control. (See Fig. 5
and 6.) Note location of wires for reassembly.
4. Remove control and bracket assembly.
5. Remove screws holding blower assembly to blower deck
and slide blower assembly out of furnace.
6. Loosen a screw in strap holding motor capacitor to blower
housing and slide capacitor out from under strap.
Fig. 4—Downflow Filter Arrangement
A88486
RETURN-AIR
PLENUM
AIRFLOW
ACCESS DOOR
INSTALLATION
POSITION
OF FILTERS
Fig. 5—Model 330JAV Upflow
A95386
MOUNTING
SCREWS
RELIEF
BOX
MAIN
LIMIT
SWITCH
MANUAL
RESET
LIMIT
SWITCHES
CONTROL
FILTER
RETAINER
WASHABLE
FILTER
PRESSURE
SWITCHES
DRAFT
SAFEGUARD
SWITCH
—3—
Summary of Contents for 330JAV
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