Ignitor; Burner Orientation; Heat Exchanger Assembly; Combustion Air Inducer (Gas Units) - Lennox KGB024 Installation Instructions Manual

5- Locate the ignitor under the right burner. Check
ignitor spark gap with appropriately sized twist drills
or feeler gauges. See figure 28.

IGNITOR

SPARK GAP
SHOULD BE 1/8"
(3mm)
FIGURE 28
6- Replace burners and screws securing burner. See
figure 29.
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
lighting instructions attached to unit and use
inspection port in access panel to check flame.

BURNER ORIENTATION

150,000 BTUH - 7 BURNERS
SENSOR
108,000 BTUH - 5 BURNERS
SENSOR
65,000 BTUH - 3 BURNERS
SENSOR IGNITOR
FIGURE 29
KG/KC 024, 030, 036, 048, 060, 072, 074, 090
IGNITOR
IGNITOR
Page 54
D-Combustion Air Inducer (Gas Units)
A combustion air proving switch checks combustion air
inducer operation before allowing power to the gas
controller. Gas controller will not operate if inducer is
obstructed.
Under normal operating conditions, the combustion air
inducer wheel should be checked and cleaned prior to the
heating season. However, it should be examined
periodically during the heating season to establish an
ideal cleaning schedule.
Clean combustion air inducer as follows:
1- Shut off power supply and gas to unit.
2- Remove the mullion on the right side of the heat
section.
3- Disconnect pressure
combustion air inducer port.
4- Remove and retain screws securing combustion
air inducer to flue box. Remove vent connector.
See figure 30.

HEAT EXCHANGER ASSEMBLY

HEAT
EXCHANGER
TUBE
COMBUSTION
AIR INDUCER
BURNER
PRIMARY
ROLLOUT
LIMIT
SWITCH
CONNECTOR
FIGURE 30
5- Clean inducer wheel blades with a small brush and
wipe off any dust from housing. Take care not to
damage exposed fan blades. Clean accumulated
dust from front of flue box cover.
6- Return combustion air inducer motor and vent
connector to original location and secure with
retained screws. It is recommended that gaskets be
replaced during reassembly.
7- Replace mullion.
8- Clean combustion air inlet louvers on blower access
panel using a small brush.
switch air tubing from
FLUE BOX
COVER
GAS VALVE
VENT