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18 Replacement of Parts
18.9 Burner injector assembly, refer to diagram
18.6.
Before starting refer to the front of
Section 18 Important
information.
• Remove the front panel
, refer to Section 15.3.
• Lower the control panel
, refer to Section 15.4.
•
Remove the sealed chamber cover
, refer to Section 15.5.
•
Remove the combustion chamber cover
, refer to Section
15.7.
• Remove burner from boiler,
refer to Section 15.9.
• Undo the gas supply union nut from under the sealed chamber.
Note: The fibre washer between the burner injector assembly
and gas supply must be kept for use on reassembly.
• Undo and remove the sense and ignition electrode assemblies.
• Remove the burner injector assembly securing screws.
• Remove the burner injector assembly by lifting up, easing the
gas connection through the grommet in the sealing chamber.
Note: Take care not to damage the insulation.
• When refitting burner injector assembly ensure the gas
connection locates correctly through the grommet.
Note: Make sure that injector size, marked on each injector, is
the same as that given in ‘
Section 1 Technical Data
’ for the type
of gas being used.
18.10 Overheat thermostat
Before starting refer to the front of
Section 18 Important
information.
• Remove the front panel
, refer to Section 15.3.
•
Remove the sealed chamber cover
, refer to Section 15.5.
• Locate overheat thermostat on heating flow pipe on right hand
side of boiler,
see part of diagram 18.7
.
• Disconnect electrical connections from thermostat
• Remove the thermostat and bracket assembly from heating
flow pipe by unclipping at the side of the bracket. Remove the
thermostat, fit new thermostat and replace assembly.
• When refitting electrical connections to replacement thermostat
the polarity is not important.
18.11 Ignition electrode
Before starting refer to the front of
Section 18 Important
information.
• Remove the front panel
, refer to Section 15.3.
• Lower the control panel
, refer to Section 15.4.
•
Remove the sealed chamber cover
, refer to Section 15.5.
•
Remove the combustion chamber cover
, refer to Section
15.7.
• Remove burner from boiler,
refer to Section 15.9.
• Remove the left hand side panel
, refer to Section 15.6.
• Undo and remove screw securing electrode assembly to the
burner injector assembly
, see diagram 18.6.
• Disconnect the electrical connections at the ignition unit
, see
diagram 18.22.
Note the routing of the cables.
18.12 Flame sense electrode
Before starting refer to the front of
Section 18 Important
information.
• Remove the front panel
, refer to Section 15.3.
• Lower the control panel
, refer to Section 15.4.
•
Remove the sealed chamber cover
, refer to Section 15.5.
•
Remove the combustion chamber cover
, refer to Section 15.7.
• Remove burner,
refer to Section 15.9
.
• Remove the right hand side panel
, refer to Section 15.6.
• Undo and remove screw securing sense assembly to the
burner injector assembly
, see diagram 18.6.
• Disconnect the electrical connection from the inline connector
,
Note the routing of the cable.
Diagram 18.7
Diagram 18.6
GAS SUPPLY
PIPE
GROMMET
IGNITION ELECTRODE
ASSEMBLY
SENSE ELECTRODE
ASSEMBLY
9813
9820
Diagram 18.5
BURNER INJECTOR
BAR
9819a
9749
PIPE
SECURING
CLIP 2 OFF
ELECTRICAL
LEADS
OVERHEAT
THERMOSTAT
HEAT EXCHANGER
9750
RESET
BUTTON
CLIP
9813
