Bosch ZSB 30-2 A Operations Instructions download pdf (Page 62)

62 | 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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Bosch ZSB 30-2 A Operations Instructions Page 62