20
6.8
a) Carefully remove the heat exchanger flue way baffles and
check for signs of damage or deterioration. Replace if
necessary.
HEAT EXCHANGER
6.9
a) Before re-assembly clean out any debris from the inside of the
sealed chamber using a soft brush or (preferably) a vacuum
cleaner.
b) Re-assemble all components in reverse order with the
exception of the right hand side-casing panel, which should
not be replaced until after the re-commissioning procedure.
c) Check all joints and seals are correctly fitted and in good
condition.
d) Ensure correct location of the burner assembly cradle on the
top runners and tie rods (refer to Fig 36) and push firmly to
the rear of the appliance ensuring correct engagement of the
insulating panels.
e) Ensure the fan assembly engages correctly in the rear locating
slots and the flue duct.
f) Ensure air pressure tubes are replaced correctly. Note that fan
wire polarity is immaterial.
g) Check the condition of the outer casing panel seal(s) and
replace if necessary.
RE-ASSEMBLY
6.10
a) Slacken the burner pressure test point screw on the gas valve
(Fig 28) and connect a suitable pressure gauge.
b) Turn on the gas supply at the isolation valve and turn on the
electricity supply.
c) Carry out the procedures detailed in section 5.1 (d) to (j)
inclusive.
d) Refit the right hand side casing panel and secure with the two
screws.
e) Refit the appliance hinged front door panel (if applicable) and
adjust the appliance control bezel to the desired setting.
RE-COMMISSIONING
6.6
a) With the main burner assembly removed from the appliance,
check that the injector is clean and free from dirt and debris.
b) If necessary clean the orifice using a soft brush or vacuum
cleaner. Under no circumstances shall a wire brush
or any other abrasive materials be used for
cleaning the burner.
c) It should not be necessary to remove the injector unless there
is evidence of debris within the orifice.
INJECTOR
6.7
a) Check the condition of the air pressure switch pipes and all
connections are sound. Ensure both ‘T’-pieces are fitted with
the appropriate sealing caps.
b) Replace any damaged tube using only genuine spare parts
from the manufacturer.
c) Check that all tubes are free from blockage.
AIR PRESSURE SWITCH TUBES
a) Remove the four screws and two wing nuts securing the
combustion chamber front panel.
b) Carefully withdraw the combustion chamber front panel and
check the condition of the front insulation material. Replace
the insulating material if there are any signs of damage,
cracking or deterioration.
c) Withdraw the burner assembly cradle from the appliance and
detach the ignition and earth connections. See Fig 36
d) Check the condition of the two side insulation panels located
in the cradle. Also check the condition of the rear-insulating
panel. Replace insulating panels where necessary.
e) Inspect the burner assembly and check that all ports are clear
from obstruction. If necessary clean using a soft brush or
vacuum cleaner. Under no circumstances shall a wire
brush or any other abrasive materials be used for
cleaning the burner.
6.5
a) With the burner assembly removed from the appliance check
the condition of the ignition / detection electrode.
b) If there are any signs of damage (i.e. ceramic cracking)
replace the electrode in accordance with section 7.9.
c) Check that the electrode is correctly positioned in relation to
the burner. See Fig 37
d) Check that both ignition and earth wires are intact and fit
correctly onto the tabs.
IGNITION AND DETECTION
ELECTRODE INSULATION
6.4
MAIN BURNER ASSEMBLY &
COMBUSTION CHAMBER
INSULATION
b) Inspect the heat exchanger from both above and below (use
of a mirror could be an advantage) and brush out any debris
between the fins using a suitable brush.
c) Check for any signs of water leakage at both ends of the heat
exchanger.
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