Maintenance - Lennox ELITE 12GCS Series Unit Information

V−Maintenance
Periodic inspection and maintenance normally consists of
changing or cleaning filters and (under some conditions)
cleaning the coils.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
FILTERS
Inspect once a month. Replace disposable or clean perma-
nent type as necessary. DO NOT replace permanent type
with disposable.
MOTORS
Indoor and outdoor fan motors are permanently lubricated
and require no maintenance.
OUTDOOR COIL
Dirt should not be allowed to accumulate on the outdoor coil
surface or other parts in the air circuit. Cleaning should be
as often as necessary to keep coil clean. Use a brush, vacu-
um cleaner attachment, or other suitable means. If water is
used to clean coil, be sure power to the unit is shut off prior
to cleaning.
NOTE − Care should be used when cleaning the coil so that
the coil fins are not damaged.
TO CLEAN BURNERS (12GCS only)
Remove from the unit as explained in burner description in
GAS COMPONENTS section. Vacuum and/or brush as re-
quired.
VENT OUTLET (12GCS only)
Visually inspect vent outlet periodically to make sure that
the buildup of soot and dirt is not excessive. If necessary,
clean to maintain adequate opening to discharge flue prod-
ucts.
CLEANING FLUE PASSAGES & HEATING ELEMENTS
With proper combustion adjustment the heat exchanger of
a gas fired furnace will seldom need cleaning. If the heat ex-
changer should become sooted, it can be cleaned as fol-
lows:
1 − Remove the burner assembly as outlined in Gas Com-
ponents section.
2 − Remove the combustion blower.
3 − At the bottom of the heat 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 in-
side of each heat exchanger from the burner inlet and
flue outlet ends.
5 − Brush out the inside of the flue collector box.
6 − If soot build−up 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 hous-
ing.
7 − After brushing is complete, blow all brushed areas with
air. Vacuum as needed.
8 − Replace parts in the reverse order they were removed
in steps 1 to 3.
9 − When replacing the flue collector box, be careful not to
tear the adjoining insulation.
10 − 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.
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