Top View - Lennox KGA Series Service Literature

D-Burners
Periodically examine burner flames for proper appearance
during the heating season. Before each heating season, ex­
amine the burners for any deposits or blockage which may
have occurred.
Clean burners as follows:
1- Turn off both electrical power and gas supply to unit.
2- Remove burner compartment access panel.
3- Remove two screws securing burners to burner sup­
port and lift the burners from the orifices. See figure 11.
Clean as necessary.
4- Locate the ignitor under the left burners. Check ignitor
spark gap with appropriately sized twist drills or feeler
gauges. See figure 13.
5- Replace burners and screws securing gas manifold.
WARNING
Danger of explosion. Can cause injury or
death. Do not overtighten main burner
mounting screws. Snug tighten only.
7- Replace access panel.
8- Restore electrical power and gas supply. Follow light­
ing instructions attached to unit and use inspection port
in access panel to check flame.
E-Combustion Air Inducer
A combustion air proving switch checks combustion air in­
ducer operation before allowing heating sequence to con­
tinue. The sequence will not be allowed to continue if induc­
er is obstructed.
The combustion air inducer wheel should be checked and
cleaned prior to the heating season. It should be examined
periodically during the heating season to establish an ideal
cleaning schedule. With power supply disconnected, the
condition of the inducer wheel can be determined by re­
moving the vent pipe and inspecting the wheel through the
outlet opening.
Clean combustion air inducer as follows:

TOP VIEW

EVAPORATOR COIL
BLOWER
CONDENSER ACCESS PANEL
CLEAN CONDENSER COIL
ENDPLATE IS SECURED
TO MULLION
CONDENSER
COILS
FIGURE 22
Page 30
1- Shut off power supply and gas to unit.
2- Disconnect pressure switch air tubing from combustion
air inducer port.
3- Remove and retain screws securing combustion air in­
ducer to flue box. Remove and retain two screws from
bracket supporting vent connector. See figure 10.
4- Clean inducer wheel blades with a small brush and
wipe off any dust from housing. Clean accumulated
dust from front of flue box cover.
5- Return combustion air inducer motor and vent connec­
tor to original location and secure with retained screws.
It is recommended that the combustion air inducer gas­
ket be replaced during reassembly.
6- Clean combustion air inlet louvers on heat access pan­
el using a small brush.
F-Flue Passageway and Flue Box
1- Remove combustion air inducer assembly as de­
scribed in section D.
2- Remove flue box cover. Clean with a wire brush as re­
quired.
3- Clean tubes with a wire brush.
4- Reassemble the unit. The flue box cover gasket and
combustion air inducer gasket should also be replaced
during reassembly.
G-Condenser Coil
Clean condenser coil annually with detergent or commercial
coil cleaner and inspect monthly during the cooling season.
Condenser coils are made of one, two and three formed
slabs. Dirt and debris may become trapped between the
slabs. To clean between slabs, carefully separate coil slabs
and wash them thoroughly. See figure 22. Flush coils with
water following cleaning.
NOTE - Remove all screws and gaskets prior to cleaning
procedure and replace upon completion.
H-Supply Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove ac­
cess panel or to clean blower wheel.
1- Remove unit top panel and condenser section access
panel.
2- Remove screws securing coil end plate to mullion.
3- Remove clips connecting coils slabs and separate
slabs 3-4" (76-102mm).
4- Clean coils with detergent or commercial coil cleaner.
5- Rinse thoroughly with water and reassemble
.