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5. Check for blockages in combustion-air and vent pipes annu-
WASHABLE
FILTER
ally.
IN FURNACE
6. Check burners for cleanliness annually.
FILTER
RETAINER
Personal injury could result from sharp metal edges, etc. Use
care when removing parts.
Step 1—Cleaning and/or Replacing Air Filter
The air filter arrangement may vary depending on the application
or orientation.
WASHABLE FILTER OR
Never operate unit without a filter or with the blower access
DISPOSABLE MEDIA
panel removed. Failure to follow this warning could result in
FILTER IN FILTER CABINET
a fire or personal injury.
A00233
NOTE: If the filter has an airflow direction arrow, the arrow must
Fig. 4—Filter Installed for Side Inlet
point toward the blower.
To clean or replace filters, proceed as follows:
4. Slide filter out of furnace.
If filter is installed in filter cabinet adjacent to furnace:
5. Furnaces are equipped with permanent, washable filter(s).
Clean filter by spraying cold tap water through filter in
1. Turn off electrical supply to furnace.
opposite direction of airflow.
2. Remove filter cabinet door.
6. Rinse filter and let dry. Oiling or coating filter is not
3. Slide filter out of cabinet.
recommended.
4. If equipped with permanent, washable filter, clean filter by
7. Slide filter into furnace.
spraying cold tap water through filter in opposite direction of
8. Recapture filter retaining wire.
airflow. Rinse filter and let dry. Oiling or coating of the filter
is not recommended.
9. Replace blower access panel and main furnace door.
5. If equipped with factory specified disposable media filter,
10. Turn on electrical supply to furnace.
replace only with media filter having the same part number
and size.
Step 2—Blower Motor and Wheel Maintenance
6. Slide filter into cabinet.
To ensure long life, economy, and high efficiency, clean accumu-
lated dirt and grease from blower wheel and motor annually.
7. Replace filter cabinet door.
The inducer and blower motors are pre-lubricated and require no
8. Turn on electrical supply to furnace.
additional lubrication. These motors can be identified by the
If filter is installed in furnace blower compartment:
absence of oil ports on each end of the motor.
1. Turn off electrical supply to furnace.
The following items should be performed by a qualified service
2. Remove main furnace door and blower access panel.
technician.
3. Release filter retainer wire. (See Figs. 3 and 4.)
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
3. Disconnect wires
a. Disconnect motor wiring harness plug on blower housing.
b. Disconnect auxiliary limit switch leads at switch.
WASHABLE
c. Disconnect field thermostat connections depending on their
FILTER
length and routing.
4. Position control box, transformer, and door switch assembly to
FILTER
SUPPORT
right side of furnace casing.
5. If condensate trap is located in left- or right-hand side of
FILTER
RETAINER
furnace casing, proceed to item 6. Otherwise remove trap and
tubing as described below:
a. Disconnect field drain connection from condensate trap.
WASHABLE FILTER OR
b. Disconnect drain and relief port tubes from condensate
DISPOSABLE MEDIA FILTER
trap.
IN FILTER CABINET
c. Remove condensate trap from blower shelf.
A00232
6. Remove screws securing blower assembly to blower shelf and
Fig. 3—Bottom Filter Arrangement
slide blower assembly out of furnace.
3

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