Glow-worm 23c - Manual (Page 36)

36 2000225000B
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 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.
• 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.
• Lower the control panel, refer to Section 15.4.
• Remove the sealed chamber cover, refer to Section 15.5.
• Locate overheat thermostat on left hand side of heat exchanger,
see part of diagram 18.8.
• Disconnect electrical connections from thermostat
• Unclip thermostat from heat exchanger.
• When refitting electrical connections to replacement thermostat
the polarity is not important.
18.11 Domestic hot water thermistor
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.
• Locate domestic hot water thermistor on domestic hot water
pipe to the left of centre of the boiler, see part of diagram 18.7.
• Disconnect electrical connections from thermostat
• Unclip thermostat from flow pipe to the heat exchanger.
• When refitting electrical connections to replacement thermostat
the polarity is not important.
18.12 Ignition electrode
Before starting refer to the front of Section 18 Important
information.
• Remove burner, 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 igniter unit, see
diagram 18.21. Note the routing of the cables.
Diagram 18.6
GAS SUPPLY
PIPE
GROMMET
IGNITION
ELECTRODE
ASSEMBLY
SENSE
ELECTRODE
ASSEMBLY
9993
9992
9991
Diagram 18.7
9996
DOMESTIC HOT WATER
THERMISTOR
➜
➜
18.13 Flame sense electrode
Before starting refer to the front of Section 18 Important
information.
• 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.