Biasi Riva Plus Combi Installation & Operation Instructions page 33

Wall hung gas boiler for central heating supply
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14. Piping Cont.
14.2
Primary – Secondary Piping with Zone Valves:
All external piping components are to be supplied by the installer.
It is very important to use a hydraulic separator before secondary circulators.
Figure 14.4
RIVA PLUS COMBI MANUAL
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