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 45
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.
45
COMBUSTION CHAMBER FRONT INSULATION
FRONT
INSULATION
INNER
SEAL
OUTER
SEAL
COMBUSTION CHAMBER
REAR INSULATION
9.7
Refer to Figure 46
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.
46
COMBUSTION CHAMBER REAR INSULATION
HEAT EXCHANGER
9.8
Refer to Figures 14 & 47
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.
e)
Disconnect the flue system from the appliance, 4 screws, and lift up
to disengage the flue from the flue hood; refer to Figure 14.
f)
Remove the retaining clip from the heat exchanger flow outlet; refer
to Figure 47.
g)
Gently pull up (or down, depending on installation) to disengage the
flow pipe from the heat exchanger.
h)
Remove the retaining clip from the heat exchanger return inlet.
i)
Rotate the return pipe clockwise and gently pull down to disengage
the return pipe from the heat exchanger.
SCREW
WASHER
REAR
INSULATION
It may be necessary to cut both flow and return pipes
to disengage them from the heat exchanger.
j)
Disconnect the condensate drainpipe from the condensate drainpipe
sump adaptor; refer to section 9.12.
k)
Unscrew the three nuts holding the heat exchanger to the back
panel; refer to Figure 47.
l)
Remove the heat exchanger.
m)
Disconnect the condensate drainpipe sump adaptor from the heat
exchanger.
n)
Remove the flue hood from the heat exchanger, two screws, and fit
the flue hood onto the new heat exchanger, Check integrity of the
flue hood seals and replace as necessary. Remove the manual air
vent and vent tube from the heat exchanger and fit onto to new heat
exchanger; refer to Figure 47.
o)
Fit the condensate drainpipe sump adaptor to the heat exchanger
and flue hood.
p)
Re-assemble in reverse order; check integrity of the flow and return
pipe 'O' rings and fibre washers and replace as necessary. Ensure
that all joints and seals are correctly re-fitted.
34
d)
Remove the gasket, and withdraw the burner; refer to Figure 43.
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 44.
g)
Re-assemble in reverse order; ensure that all joints and seals are
correctly re-fitted.
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