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y Flush the heat exchanger from the top. Refer to
fig. 51.
y Clean out the condensate collector and trap connec-
tion (with other end of brush).
Fig. 51
y Refit the clean-out cover using a new seal and
tighten screws to torque of approx. 5 Nm.
Burner
y Check that the gas cock is turned off and the master
switch is in the OFF position.
y Remove the clips (1) and unscrew the two bolts (2).
Refer to fig. 52.
y Unscrew and remove the two hexagon screws secur-
ing the fan (3).
y Slacken fully the rear securing bolt (4).
y Remove the burner coverplate.
Fig. 52
6 720 610 596 GB (01.07)
y Remove the burner skin and clean components. Do
not use a wire brush. Refer to fig. 53.
Fig. 53
y Re-assemble burner in reverse order using a new
seal.
y Adjust gas/air ratio. Refer to section 7.2.
Condensation trap
In order to prevent spillage of condensate, the conden-
sation trap should be completely removed, (see
page 34, fig. 48).
y Unscrew condensation trap and check connection to
heat exchanger is clear.
y Remove condensation trap cover and clean.
y Fill condensation trap with approx. 1/4 l of water and
refit.
Electrode assembly
y Switch off the master switch.
y Pull off the leads from the electrodes. Refer to fig. 2.
y Unscrew the two fixing screws and carefully remove
the electrode assembly. Refer to fig. 47.
y Clean the electrodes with a non-metallic brush. (The
spark gap should be 4,5 mm ± 0,5 mm.)
y Replace and re-connect the assembly taking care not
to mislay the inspection window.
Maintenance
35
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