Ferroli XIGNAL CE Technical Information Installation And Service Instructions page 13

Cold water
NOTE: A bypass must be fitted as far as possible from the boiler if thermostatic radiator valves are fitted
throughout.
Key
1. Filling point C.H.
2. Temporary connection
3. Cold water supply
Gas
Filling
point C.H.
Fig. 6
Fig. 7
Additional expansion vessel C.H.
(if required)
Bypass
13