Glow-worm Xtramax - Manual (Page 29)

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17 Routine Cleaning and Inspection
17.8 Burner, refer to diagram 17.3.
• Undo main gas supply nut from under the sealed chamber.
Note: The washer between main burner and main burner gas
supply must be kept for use on reassembly.
• Pull off ignition leads from ignition unit.
• Pull off flame sense lead from flame sense electrode.
• Unscrew and remove burner support bracket securing screw
and remove bracket.
• Remove burner from boiler by lifting up and pulling forwards
easing the leads through the grommet, taking care not to
damage insulation.
• Clean burner by washing in soapy water. Dry thoroughly
before refitting.
• When refitting burner ensure that rear of burner locates into
location slot and the injector locates correctly through the
grommet.
Note: To gain access to injectors for removal, refer to Section,
20.24 in Replacement of Parts.
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Diagram 17.3
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9345
MAIN GAS
SUPPLY NUT
GROMMET
BURNER
SUPPORT
BRACKET
BURNER
LOCATION
SLOT
FLAME
SENSE
LEAD
IGNITION
LEADS
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17.9 Heat exchanger, refer to diagram 17.4.
• Disconnect electrical connections from fan.
• Unscrew and remove two fan retaining screws from the right
hand side edge of fan mounting plate.
• Remove fan with mounting plate attached by pulling forward
and out of boiler.
• Remove air pressure switch sensing tube at rear of flue hood.
• From front of boiler carefully unclip wire spring retainers from
side of flue hood.
• Remove the overheat thermostat by unclipping from the
heating return pipe.
• Lift flue hood clear of heat exchanger and examine for debris.
• Using a soft brush or vacuum clean as required.
DO NOT USE ANY TOOL LIKELY TO DAMAGE PAINTED
FINISH OF HEAT EXCHANGER.
Note: When re-fitting fan, make sure that the two lugs on the fan
mounting plate engage in the flue hood
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Diagram 17.4
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AIR PRESSURE SWITCH
SENSING TUBE
WIRE SPRING
RETAINER
2 OFF
FAN
RETAINING
SLOTS
OVERHEAT
THERMOSTAT
➜
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