Pag. 34 di 69
4.9 BY-PASS
The boiler has an automatic by-pass and, therefore no regulation is required. In the case of load losses in
the system caused for example by the intervention of thermostat or area valves, the by-pass guarantees a
flow in the condensing main exchanger of at least 350l/h (on the combi boiler this circulation is done through
the DHW plate heat exchanger).
The by-pass is therefore designed to protect the condensing main exchanger from overheating in the case of
poor or insufficient water circulation.
If this condition occurs, the system regulates the power normally and then switches off the main burner when
the set-point temperature is reached.
In the combi boiler the by-pass is positioned in the return group and behind the 3 way valve.
In the system boiler the by-pass is positioned in the delivery unit in le left side of the 3 bar safety valve.
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