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XVI. MAINTENANCE
WARNING
TO AVOID ELECTRICAL SHOCK, INJURY OR DEATH, DISCONNECT ELECTRICAL
POWER BEFORE PERFORMING ANY MAINTENANCE. IF YOU MUST HANDLE THE
IGNITER, HANDLE WITH CARE.
T
OUCHING THE IGNITER ELEMENT WITH BARE
FINGERS, ROUGH HANDLING, OR VIBRATION COULD DAMAGE THE IGNITER
RESULTING IN PREMATURE FAILURE.
O
NLY A QUALIFIED SERVICER SHOULD
EVER HANDLE THE IGNITER.
ANNUAL INSPECTION
The furnace should be inspected by a qualified installer, or service
agency at least once per year. This check should be performed at
the beginning of the heating season. This will ensure that all
furnace components are in proper working order and that the
heating system functions appropriately. Pay particular attention to
the following items. Repair or service as necessary.
• Flue pipe system. Check for blockage and/or leakage.
Check the outside termination and the connections at and
internal to the furnace.
• Heat exchanger. Check for corrosion and/or buildup within
the heat exchanger passageways.
• Burners. Check for proper ignition, burner flame, and flame
sense.
• Wiring. Check electrical connections for tightness and/or
corrosion. Check wires for damage.
• Filters.
FILTERS
WARNING
T
O AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH, DISCONNECT
ELECTRICAL POWER BEFORE REMOVING FILTERS.
N
EVER OPERATE FURNACE
WITHOUT A FILTER INSTALLED BECAUSE DUST AND LINT WILL BUILD UP ON
INTERNAL PARTS RESULTING IN LOSS OF EFFICIENCY, EQUIPMENT DAMAGE
AND POSSIBLE FIRE.
A return air filter is not supplied with this furnace; however, there
must be a means of filtering all of the return air. The installer will
supply filter(s) at the time of installation.
FILTER M AINTENANCE
Improper filter maintenance is the most common cause of
inadequate heating or cooling performance. Filters should be
cleaned (permanent) or replaced (disposable) every two months
or as required. When replacing a filter, it must be replaced with a
filter of the same type and size.
WARNING
T
O PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER TO THE FURNACE
BEFORE REMOVING THE FILTER OR PERFORMING ANY OTHER MAINTENANCE.
Become familiar with filter location and procedures for removal,
cleaning and replacing them. If help is needed, contact the installer
of the furnace or a qualified servicer.
FILTER REMOVAL
Depending on the installation, differing filter arrangements can
be applied. Filters can be installed in either the central return
register or a side panel external filter rack (upflow only). A media
air filter or electronic air cleaner can be used as an alternate filter.
Follow the filter sizes given in the Recommended Minimum Filter
size table to ensure proper unit performance.
To remove filters from an external filter rack in an upright upflow
installation, follow the directions provided with external filter rack
kit. Internal filters are an accessory item and are not included
with your furnace. For further details, see your distributor.
UPRIGHT FILTER REMOVAL
To remove filters from an external filter rack in an upright upflow
installation, follow the directions provided with external filter rack
kit.
Clean, wash and dry a permanent filter. When using a permanent
filter, both sides should be sprayed with a dust adhesive as
recommended on adhesive container. Spray adhesives for use
with permanent filters can be found at some hardware stores. BE
SURE AIRFLOW DIRECTION ARROW POINTS TOWARDS THE
BLOWER.
Inspect filter. If your dirty filter is the disposable type, replace dirty
with the same type and size filter. If your dirty filter is a permanent
filter, clean as follows:
• Wash, rinse, and dry the permanent filters. Both sides
should then be sprayed with a filter adhesive as is
recommended on the adhesive container. Many hardware
stores stock spray adhesives for use with permanent filters.
• If badly torn or uncleanable, these filters must be replaced
by equal size permanent, high velocity filters. Throwaway
filters must not be used as replacement for permanent
filters. Under normal use, permanent filters should last for
several years.
INDUCED D RAFT AND CIRCULATOR B LOWER MOTORS
The bearings in the induced draft blower and circulator blower
motors are permanently lubricated by the manufacturer. No further
lubrication is required. Check motor windings for accumulation
of dust which may cause overheating. Clean as necessary.
FLAME SENSOR (QUALIFIED SERVICER ONLY)
Under some conditions, the fuel or air supply can create a nearly
invisible coating on the flame sensor. This coating acts as an
insulator causing a drop in the flame sense signal. If the flame
sense signal drops too low the furnace will not sense flame and
will lock out. The flame sensor should be carefully cleaned by a
qualified servicer using emery cloth or steel wool. Following
cleaning, the flame sense signal should be 1 to 6 microamps at
115 volts.
IGNITER (QUALIFIED SERVICER ONLY)
If the igniter and the surrounding air are at about 70°F and the
igniter wires are not connected to any other electrical components,
the resistance of the igniter should not exceed 75 ohms. If it does,
the igniter should be replaced.
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