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12.0 Servicing the Boiler - Page 28
12.1 Annual Servicing (Cont)
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. 41).
b) Loosen the screw retaining the gas injector pipe at the
venturi (Fig. 41).
c) Undo the two wing nuts to disconnect the fan (Fig. 41).
d) Remove the fan and disconnect the electrical supply to it
(Fig. 41).
e) Remove the gas injector pipe from the gas valve (push-
fit) (Fig. 41).
f) Undo the condensate trap securing nut, lock nut and the
condensate drain pipe. Remove the condensate trap and
disconnect the sensor leads (Fig. 42).
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. 43) (see
note, page 26).
h) Loosen the two screws retaining the heat exchanger
support bracket and slide to the left to remove (Fig. 43).
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. 43). Replace the lower insulation pad if necessary.
k) Ensure the heat exchanger fins are clear of any
obstruction.
I) Check condition of all 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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