Technical data

INSTALLATION & SERVICING INSTRUCTIONS
If the electrode is damaged, replace (see Section 9.2)
9.1.7 Inspect the Heat Exchanger
a Inspect the heat exchanger for deposits. If these are evident, remove the attic fixing screw, and
remove the attic by pulling forward. Remove the two attic insulation pieces.
b Remove the two combustion chamber side insulation retaining brackets (see
Figure 13) by pulling
forward, remove the two side insulation pieces by easing down, then forward.
c Brush the heat exchanger from above and below, using a stiff brush. The brush motion should be
from front to back, NOT from side to side. Remove all deposits from base of boiler.
9.1.8 Reassembly
Reassemble the components in reverse order, noting:
a The main burner must be correctly located on the injector.
b The pilot injector must be repositioned on the pilot tube.
c The electrode nut must not be overtightened.
d Any damaged insulation must be replaced.
e All combustion chamber door fixing screws must be fully tightened, checking that a good seal is
made.
9.1.9 Final Checks
Restore the gas and electricity supply to the boiler and check:
a For gas soundness. The pilot tube nut at the pilot assembly should be checked before the
combustion chamber door is refitted.
b That the burner pressure is set to give the correct output for the system. The data badge showing
the correct burner pressure is located on the lower right hand corner of the wallplate.
c For the correct operation of the flame failure device. Check that the thermocouple output is 6-10mV
closed circuit.
d For the correct operation of the system controls.
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