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The ability to properly perform maintenance on this equip-
ment requires certain expertise, mechanical skills, tools, and
equipment. If you do not possess these, do not attempt to
perform any maintenance on this equipment other than those
procedures recommended in the User’s Manual. FAILURE
TO FOLLOW THIS WARNING COULD RESULT IN
POSSIBLE DAMAGE TO THIS EQUIPMENT, SERIOUS
PERSONAL INJURY, OR DEATH.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, it is essential that periodic maintenance be performed
on this equipment. Consult your local dealer as to the proper
frequency of maintenance and the availability of a maintenance
contract.
Turn off the gas and electrical supplies to the unit before
performing any maintenance or service. Follow the operating
instructions on the label attached to the furnace. A failure to
follow this warning could result in personal injury.
Never store anything on, near, or in contact with the furnace,
such as:
1. Spray or aerosol cans, rags, brooms, dust mops, vacuum
cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning com-
pounds, plastic or plastic containers, gasoline, kerosene,
cigarette lighter fluid, dry cleaning fluids, or other volatile
fluids.
3. Paint thinners and other painting compounds, paper bags
or other paper products.
A failure to follow this warning could result in corrosion of
the heat exchanger, fire, personal injury, or death.
The minimum maintenance that should be performed on this
equipment is as follows:
1. Check and clean air filter each month or more frequently if
required. Replace if torn.
2. Check blower motor and wheel for cleanliness and lubrication
each heating and cooling season. Clean and lubricate as
necessary.
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as necessary.
As with any mechanical equipment, personal injury can result
from sharp metal edges, etc., therefore, be careful when
removing parts.
AIR FILTER ARRANGEMENT — The air filter arrangement
may vary depending on the application. Refer to Table 1 or 2 for
filter size information.
Table 1—Filter Size Information for Downflow
Furnace (In.)
FURNACE
CASING WIDTH
FILTER QUANTITY
AND SIZE
FILTER
TYPE
14-3/16 (2) 16 X 20 X 1 Cleanable
17-1/2 (2) 16 X 20 X 1 Cleanable
21 (2) 16 X 20 X 1 Cleanable
24-1/2 (2) 16 X 20 X 1 Cleanable
Table 2—Filter Size Information for Upflow
Furnace (In.)
FURNACE
CASING WIDTH
FILTER QUANTITY AND SIZE
FILTER
TYPE
Side Return Bottom Return
14-3/16 (1) 16 X 25 X 1* (1) 14 X 25 X 1 Cleanable
17-1/2 (1) 16 X 25 X 1* (1) 16 X 25 X 1 Cleanable
21 (1) 16 X 25 X 1 (1) 20 X 25 X 1* Cleanable
24-1/2 (2) 16 X 25 X 1* (1) 24 X 25 X 1 Cleanable
* Factory provided with the furnace. Filters may be field modified by cutting as
required.
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
Each furnace requires 2 filters which are installed in the
return-air duct. (See Fig. 3.)
To remove filters for cleaning or replacement, proceed as
follows:
a. Disconnect electrical power before removing blower access
door.
Fig. 3—Filter Positions
A88486
RETURN-AIR
PLENUM
AIRFLOW
ACCESS DOOR
INSTALLATION
POSITION
OF FILTERS
2