Ferroli BlueHelix HiTech RRT C Instructions For Use, Installation & Maintenance page 20

Make up water
Provision must be made for replacing water lost from the sealed system. Reference should be made to BS6798, for
methods of filling and making up sealed systems. There must be no direct connection between the boiler's central hea-
ting system and the mains water supply. The use of mains water to charge and pressurise the system directly, is con-
ditional upon the Local Water Byelaws. Again any such connection must be disconnected after use. Ensure the filling
point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
Filling Loop in fig. 29 is supplied with boiler.
Key
1. C.H. filling valve
2. Temporary connection
3. Cold water supply valve
4. Double check valve
The maximum domestic water pressure for the inlet supply is 9 bar (130 P.S.I.). If the cold mains supply exceeds 5 bar
(72 P.S.I.), a water governor or pressure reducing valve must be fitted by the installer into the mains supply in an in-
conspicuous but accessible position preferably between 3 and 5 metres (10-16ft) before the appliance. Such a valve
must be approved by WRAS. The fitting of a DHW expansion vessel is also recommended.
Isolation valve kit
The isolation valves supplied (see fig. 30) must be installed between the boiler and heating system to allow the boiler
to be isolated from the system if necessary.
fig. 30 - Isolation valve kit
Frost protection system, antifreeze liquids, additives and inhibitors
If necessary, the use of antifreeze liquids, additives and inhibitors is allowed, only and exclusively if their manufacturer
guarantees that the products are suitable for use and do not cause damage to the boiler's heat exchanger.or other com-
ponents and/or materials of the boiler and system. It is prohibited to use generic antifreeze liquids, additives or inhibitors
that are not expressly suitable for use in heating systems and compatible with the materials of the boiler and system
20
BlueHelix HiTech RRT C
fig. 29 - Filling Loop (supplied with boiler)
A
B
C
D
F
cod. 3541V691 - Rev. 00 - 04/2022
Heating Flow 3/4" (22mm with isolation valve fitted)
DHW outlet elbow 1/2" (15mm with outlet union fitted)
Gas 3/4" (22mm with yellow isolation valve fitted)
Cold water inlet 1/2" (15mm with isolation valve fitted)
Heating Return 3/4" (22mm with isolation valve c/w fil-
ter fitted)
EN