Viessmann VITODENS 200 WB2A, Installation & Servicing Instructions Manual

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a)
Gain access by following step 9.1(b).
b)
Remove the plate heat exchanger as in 9.16 above. Refer to section 6.7.
c)
Uncouple the pipe couplings immediately below the flow switch body and
above the DHW inlet isolation valve.
d)
Lift the flow switch body slightly and remove the section of pipe between the
flow switch and the isolation valve.
e)
Remove the flow regulator from the inlet of the flow switch.
f)
Replace (or clean) the water flow regulator.
g)
Reassemble in reverse order. Check for water soundness.
h)
Replace the DHW heat exchanger using new gaskets with lubricant and
reassemble in reverse order.
9 Replacement of Parts
9.17 DHW Flow Regulator (to replace or clean)
Figure 9/B: DHW Heat Exchanger
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