Ariston ALTEAS ONE Net Series Installation And Servicing Instructions page 54

MAINTENANCE GUIDE
3.9 D.H.W. Flow switch assembly
Tools
Drain the boiler (see 3.3). Remove the clip and pull the fl ow
switch assembly upward.
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3.10 LEFT HAND HYDRAULIC BLOCK ASSEMBLY
TIME 10 min
Legend:
1 - Safety valve
2 - Central heating fl ow
3 - Domestic hot water outlet
4 - Secondary heat exchanger
3.11 Secondary heat exchanger
Tools
Drain primary and domestic hot water circuits.
Remove the silencer.
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Remove the two screws and remove the heat exchanger
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TIME 10 min