Page 22
C−Burners
1− Periodically examine burner flames for proper
appearance
during
the
heating
season.
Use
inspection port in the front of the burner compartment
access panel.
2− Before each heating season examine the burners for
any deposits or blockage which may have occurred.
3− Clean burners as follows:
a−Turn off both electrical power and gas supply to
unit.
b−Remove access panel to burner compartment.
c−Remove burner mounting screws and lift burners
from orifice.
d−Clean as necessary and replace burners and secure
with mounting screws. Make sure that burner heads
line up correctly. Spark gaps on ignitor and flame
sensing electrode must be properly set. Refer to
Heating Adjustment section. Replace access panel.
WARNING
Danger of explosion. Can cause injury or
death. Do not overtighten main burner
mounting screws. Snug tighten only.
e− Restore electrical power and gas supply. Follow
lighting instructions located on inside panel. Use
inspection port in access panel to check flame.
D−Combustion Air Inducer
A combustion air blower motor proving switch, S18,
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.
Cleaning Combustion Air Inducer and Vent Cap
1− Shut off power supply and gas to unit.
2− Remove the heat access panel. Disconnect motor
wires & three motor mounting screws.
3− Clean inducer wheel with a small brush and wipe off
any dust from housing. See figure 23. Clean
accumulated dust from front of flue box cover. Inspect
flue passageway and flue box when removing the
combustion air inducer. If cleaning is necessary use
wire brush.
CLEAN INDUCER WHEEL WITH BRUSH
FIGURE 23
4− Replace combustion air inducer motor by reversing
this
procedure.
It
is
recommended
that
the
combustion air inducer gasket be replaced during
reassembly.
5− Clean combustion air supply (hood located on heat
access panel) using a small brush.
E−Evaporator Coil
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
disconnect switch(es). Unit may have
multiple power supplies.
Inspect and clean coil at beginning of each cooling and
heating
season.
Clean
using
mild
detergent
or
commercial coil cleanser. Flush coil and condensate
drain with water taking care not to get insulation, filters,
return air ducts wet.
