Ferroli Optima 801 Installation Instructions Manual page 11

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
Cold water
801
Additional expansion vessel C.H.
Filling
point C.H.
Fig. 6
Fig. 7
(if required)
Bypass
11