Lennox KGC Series Unit Information page 40

I G N T I
A
B
C
S D I
1-3/8"
(35mm)
D-Combustion Air Inducer
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. With power supply disconnected,
the condition of the inducer wheel can be determined by
looking through the vent opening.
Clean combustion air inducer as follows:
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 inducer to flue box. Remove and retain two
screws from bracket supporting vent connector.
See FIGURE 27.
IGNITOR AND SENSOR POSITION
O R
E V E I W I G N T I O R
Gas Flow
13/16"
(21mm)
TOP VIEW
S D I
BURNER BOX
FIGURE 26
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
connector to original location and secure with
retained screws.
6 - It is recommended that the combustion air inducer
gasket be replaced during reassembly.
HEAT EXCHANGER ASSEMBLY
HEAT
EXCHANGER
TUBE
COMBUSTION
AIR INDUCER
GAS VALVE
Page 40
S E N S O R
A
B
C
E V E I W S E N S O R
Gas Flow
3/8"
(10mm)
CONNECTOR
BURNER
FIGURE 27
1-3/4"
(45mm)
VENT