Ferroli Optima 901 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
Fig.
3. Cold water supply
Gas
Cold water
901
Additional expansion vessel C.H.
Filling
point C.H.
Fig. 6
(if required)
Bypass
7
11