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12.0 Servicing the Boiler – page 27
Fig 44
12.1
Annual Servicing (Cont)
NOTE: General cleaning can be undertaken using a
vacuum. However debris should only be gently blown
off the burner skin due to Its fragile nature.
11. If CO/CO
ratio is greater than 0.02 then proceed as
2
follows to allow removal and cleaning of inner and rear
heat exchanger flueways:
a)
Disconnect the electrical leads to the fan component
protection sensor (Fig. 42).
b)
Loosen the screw retaining the gas injector pipe at the
venturi (Fig. 42).
c)
Undo the two wing nuts to disconnect the fan (Fig. 42).
d)
Remove the fan and disconnect the electrical supply to
it (Fig. 42).
e)
Remove the gas injector pipe from the gas valve (push-
fit) (Fig. 42).
f)
Undo the condensate trap securing nut, lock nut and
the condensate drain pipe. Remove the condensate
trap and disconnect the sensor leads (Fig. 43).
g)
Remove the two screws securing the burner and
remove the burner. Visually inspect the internal burner
baffle for obstruction.
NOTE: The burner skin is fragile - handle with care. Clean
and if necessary replace the burner (Fig. 44) (see note
above).
h)
Loosen the two screws retaining the heat exchanger
support bracket and slide to the left to remove (Fig. 44).
i)
Remove the four screws securing the heat
exchanger/combustion box base and withdraw the
base.
j)
Lower the central insulation panel and check condition
(Fig. 44). Replace the lower insulation pad if necessary.
k)
Ensure the heat exchanger fins are clear of any
obstruction.
I)
Check condition of all seals. Important: Pay particular
attention to the condition of the combustion box door
seals.
m)
Reassemble in reverse order.
12. Complete the relevant section of the "Benchmark"
Installation, Commissioning and Service Record Log
Book and hand it back to the user.
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