507640-05
Page 23 of 25
Issue 2245
Maintenance
Periodic inspection and maintenance normally consists of
changing or cleaning the filters and cleaning the evaporator
coil. On occasion, other components of the furnace may
also require cleaning.
Shut off all electrical power to the unit before conducting
any maintenance procedures. Failure to do so could
cause personal injury.
WARNING
Filters
Filters are not supplied with the unit. Inspect once a month.
Replace disposable or clean permanent type as necessary.
Do not replace permanent type with disposable.
Motors
Indoor and outdoor fan and vent motors are permanently
lubricated and require no maintenance.
Evaporator Coil
Dirt and debris should not be allowed to accumulate on
the evaporator coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil
clean. Use a brush, vacuum cleaner attachment, or other
suitable means. If water is used to clean the coil, be sure
the power to unit is shut off prior to cleaning.
Care should
be used when cleaning the coil so that the coil fins are
not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
Condenser Coil
Clean condenser coil annually with water and inspect
monthly during the cooling season.
Condenser coil may need to be cleaned at startup in
case oil from the manufacturing process is found on the
condenser coil.
Burners
To clean the burners, first remove them from the furnace
as explained in Burner and Burner Orifice Instructions on
Page 17. Vacuum and/or brush as required.
Vent Outlet
Visually inspect vent outlet periodically to make sure that
there is no buildup of soot or dirt. If necessary, clean to
maintain adequate opening to discharge flue products.
Heat Exchanger
With proper combustion adjustment, the heat exchanger
of a gas-fired furnace will seldom need cleaning. Sooting
of a gas appliance is highly irregular and once cleaned,
the cause of the sooting must be determined. If the heat
exchanger should become sooted, it can be cleaned as
follows:
1. Remove the burner assembly as outlined in Burner
and Burner Orifice Instructions on Page 17.
2. Remove the combustion blower.
3. At the bottom of the heating section, remove the screws
holding the flue collector box. Carefully remove the flue
collector box without ripping the adjacent insulation.
4.
Using a wire brush on a flexible wand, brush out the
inside of each heat exchanger from the burner inlet
and flue outlet ends.
5.
Brush out the inside of the flue collector box.
6. Run the wire brush down the heat exchanger tubes
from the flue collector end.
7. If soot buildup is excessive, remove the vent motor and
clean the wheel and housing. Run the wire brush down
the flue extension at the outlet of the vent housing.
8. After brushing is complete, blow all brushed areas with
air. Vacuum as needed.
9. Replace parts in the reverse order they were removed
in steps 1 through 3.
10.
When replacing the flue collector box, be careful so as
not to tear the adjoining insulation.
11. Assure that all joints on the vent side of the combustion
system are air tight. Apply a high temperature (+500°F)
sealing compound where needed.
