Technical information

38
11.3 Burner
Refer to diagrams, 11.2,11.3,11.4 and 11.5.
Isolate the gas supply at the gas service cock.
Disconnect the gas supply at the gas service
cock.
NOTE: DO NOT DISCONNECT AT THE
GAS VALVE.
Remove the two gas pipe bracket securing screws
from underside of inner case, see diagram 11.2.
Drop down the control panel into the service
position.
Remove the four screws from the chassis front,
see diagram 11.3.
Remove the chassis front by pulling it out at the
top from its retaining slots.
NOTE: When replacing chassis front panel ensure
the bottom fits behind lip.
Disconnect the gas valve plug at the gas valve,
see diagram 11.4.
Disconnect the electrical leads from the fan.
Remove the five combustion chamber front
securing nuts, see diagram 11.5.
Gently remove the fan, gas valve and burner
assembly from the combustion chamber complete
with the gas pipe bracket and seal.
Clean the burner with a soft brush taking great
care not to damage the front insulation. DO NOT
use wire or sharp instruments to clean the holes
of the burner.
Inspect the burner for any signs of damage.
Removal of the burner is not necessary during a
normal service.
NOTE: IF THE BURNER HAS TO BE REMOVED
IT WILL REQUIRE A NEW GASKET WHEN
REFITTED.
When replacing the assembly ensure the sealing
grommet is correctly fitted.
SECURING
SCREW
2 OFF
SPARK GAP
3.5 to 4.5
Diagram 11.1
HEAT
EXCHANGER
GASKET
SPARK
ELECTRODE
EARTH
LEAD
12595
Diagram 11.2
12596
CONDENSE TRAP
GAS
SERVICE
COCK
GAS
SUPPLY PIPE IN
GAS PIPE BRACKET
SECURING SCREW
SEALING
GROMMET
UNION
NUT
Diagram 11.3
12597
CONTROL PANEL
SERVICE POSITION
SECURING
SCREW
(4 OFF)
CHASSIS
FRONT