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BURNER
9.5
Refer to Figures 38, 39 & 40
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 three torx screws, (T-25), holding the manifold to the
combustion chamber front cover, and remove the manifold; refer to
Figure 38.
d)
Remove the gasket, and withdraw the burner; refer to Figure 39
e)
Fit replacement burner, taking care not to damage the insulation,
and ensure burner is correctly located by lining up the locating tab.
f)
Fit new gasket; refer to Figure 40.
g)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
COMBUSTION CHAMBER
FRONT INSULATION
9.6
The design of the appliance is such that the combustion chamber
insulation should not require replacement unless mechanically
damaged. It is recommended that to prevent dust, the insulation be
dampened prior to removal, and that a protective mask is worn when
changing or handling the insulation material.
Refer to Figure 41
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)
Remove the electrodes; refer to section 9.1.
d)
Remove the burner: refer to section 9.5.
e)
Replace the combustion chamber front insulation.
f)
Re-assemble the burner and electrodes, using new gaskets.
g)
Check the position of the electrodes: refer to section 6.4.
h)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
41
COMBUSTION CHAMBER FRONT INSULATION
FRONT
INSULATION
INNER
SEAL
OUTER
SEAL
COMBUSTION CHAMBER
REAR INSULATION
9.7
Refer to Figure 42
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)
Use an Allen key to undo the central screw holding the rear
insulation in place.
d)
Remove old insulation and fit replacement, ensuring locating
washer is in front.
e)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
42
COMBUSTION CHAMBER REAR INSULATION
HEAT EXCHANGER
9.8
Refer to Figures 15 & 43
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)
Disconnect the electrical leads to the flue sensor, flow sensor and
return sensor.
d)
Drain down the appliance; refer to section 9.24.
e)
Disconnect the flue system from the appliance, 4 screws, and lift up
to disengage the flue from the flue hood; refer to Figure 15.
f)
Remove the retaining clip from the heat exchanger flow outlet, and
undo the nut connecting the flow pipe to the plate-to-plate heat
exchanger. On SBX appliances undo the nut connecting the flow pipe
to the CH flow isolating cock; refer to Figure 43.
g)
Rotate the flow pipe anticlockwise and gently pull down to
disengage the flow pipe from the heat exchanger.
h)
Remove the retaining clip from the heat exchanger return inlet, and
undo the nut connecting the flow pipe to the hydroblock adaptor
fitting.
i)
Rotate the return pipe clockwise and gently pull down to disengage
the return pipe from the heat exchanger.
SCREW
WASHER
REAR
INSULATION
35
751030 MANUAL (NEW) 21/9/10 08:41 Page 23
