Filter
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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 for filter size information.
Table 1—Filter Size Information (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. Each furnace requires 1 or 2 filters which are installed in the
blower compartment. (See Fig. 2.)
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. 2.) 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.
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:
2. Remove control assembly.
3. Remove blower leads from blower assembly. Note location of
wires for reassembly.
4. Remove screws holding blower assembly to blower deck and
slide blower assembly out of furnace.
5. Loosen screw in strap holding motor capacitor to blower
housing and slide capacitor out from under strap.
Fig. 2—Model 58GFA Upflow
A92178
DRAFT
SAFEGUARD
SWITCH
RELIEF
BOX
MOUNTING
SCREWS
FLUE
COLLECTOR
BOX
GAS
VALVE
PILOT
FILTER
RETAINER
WASHABLE
FILTER
CONTROL
BOX
2