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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 heating system and the mains water supply. The use of mains water to
charge and pressurise the system directly, is conditional upon the Local Water Byelaws. Again any
such connection must be disconnected after use. The supplied temporary filling loop is shown in fig.
4. Ensure the filling point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and
certain water undertakings will not accept their use above ground.
Key
1. Filling point C.H.
2. Temporary connection
3. Cold water supply
4. Double check valve
Water treatment
if water treatment is used Ferroli Ltd recommend only the use of Fernox or Sentinel water
treatment products, which must be used in accordance with the manufacturers instructions. For
further information contact:
Fernox Manufacturing Co. LTD.
Tandern house, Marlowe Way
Croydon, surrey, CRO 4YS
Tel. 02870 5601 5000
Note - If the boiler is installed in an existing system any unsuitable additives must be removed
by thorough cleansing.
All systems should be cleansed according to B.S. 7593.
Note - In hard water areas treatment to prevent lime scale may be necessary.
Note - It is important that the correct concentration of the water treatment product is maintained in
accordance with the manufactures instructions.
Filling the boiler and the system
The filling pressure, when the system is cold, must be around 1 bar (at least 0.5 bar). If the pressure
drops during operation to a value lower than the minimum described above, the User must restore
the initial value using the filling loop. For correct boiler operation, the pressure, when hot, must
be around 1,5-2 bar. Once the operation is completed, always close the filling loop. This device
is fitted to the system by the installer.
10
4
3
Sentinel Division
Betz Dearborn LTD
Widnes, Cheshire WA8 5351
Tel. 0151 424 5351
SYS 10-23
2
Fig. 5
1
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