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Inspection/Servicing
6 720 644 143 (2010/09)
15.2.7 Diaphragm in mixer unit
B
Open the mixing chamber.
B
Carefully withdraw diaphragm from fan intake tube
and check for soiling and splits.
Fig. 72
B
Carefully refit the diaphragm into the fan connector,
in the correct position.
B
Close the mixing chamber.
15.2.8 Cleaning condensate trap
B
Remove condensate trap and check that the heat
exchanger connection is clear.
Fig. 73
B
Remove and clean the condensate siphon sump.
B
Check condensate hose and clean if necessary.
B
Fill condensation trap with approx. 1/4 l of water and
refit.
15.2.9 Checking the expansion vessel (see also
page 25)
The expansion vessel should be checked annually.
B
Depressurise the appliance.
B
If necessary, adjust charge pre-charge pressure of
expansion vessel to the static head of the heating
system.
CAUTION:
Ensure that the diaphragm is not
damaged during its release and refitting!
The diaphragm flaps must open upwards.
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6 720 644 143-19.1O
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