9
REPLACEMENT OF PARTS
IGNITION & DETECTION ELECTRODES
9.1
Before commencing any service operation, ISOLATE the mains electrical
supply and TURN OFF the gas supply at the main service cock.
Replacement of most parts first requires the removal of the sealed
chamber front panels; refer to section 6.2.
There may be some slight water spillage; so electrical components
should be protected.
It is the law that any service work must be carried out by a registered
person.
Refer to Figure 33
a)
Ensure supply voltage is isolated, and that the gas supply is isolated.
b)
Remove the gas control valve, fan & burner assembly; refer to
section 6.2.
c)
Unscrew the two screws holding the electrode, remove electrode,
and used gasket.
d)
Fit the new electrode, and new gasket.
e)
Check that electrode is aligned as detailed in Figures 29(a) or 29(b).
f)
Re-assemble in reverse order. Ensure that all joints and seals are
correctly re-fitted.
IGNITOR UNIT & IGNITION LEADS
9.2
Refer to Figure 34
a)
Ensure supply voltage is isolated.
b)
Remove the plug and earth lead from the ignition electrode.
c)
Remove the electrical supply leads.
d)
Unscrew the two screws holding the ignitor unit, remove ignitor
unit.
e)
Fit the new ignitor unit.
g)
Re-assemble in reverse order; ensure that the ignitor unit is
orientated as shown in Figure 34, and that the brown electric supply
lead is fitted to position 1 on the igniter unit.
h)
Ensure that all joints and seals are correctly re-fitted.
33
34
IGNITOR UNIT AND IGNITION LEADS
ELECTRODE
PLUG
SCREW
ELECTRODE (IGNITION)
GASKET
ELECTRODE (DETECTION)
SCREW
IGNITION
MODULE
SCREW
IGNITION LEAD
EARTH LEAD
IGNITION ELECTRODE
IGNITION & DETECTION
ELECTRODES
30
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