Ferroli F24 Installation, Servicing And User Instructions Manual page 24

3.06 Connecting the central heating and domestic hot water circuits
Connect to the relevant connections as indicated in fig. 1.
Connect the pressure relief valve discharge pipe (15mm) to the outside of the building, where possible over a drain.
The discharge must be such that it will not be hazardous to occupants and passers-by or cause damage to external
electric components or wiring. The pipe should be directed towards the wall.
To ensure long life, the heating circuit should be correctly sized and fitted with all the controls necessary to ensure
correct functioning and operation. The differential between the boiler flow and return pipes should not be more
than 20°C. You are advised not to use the boiler with return temperatures of less than 50°C in order to prevent
patches of condensation forming and having a corrosive effect on boiler components.
3.07 Water treatment
If water treatment is used ferroli limited 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: 0870 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 manufacturers instructions.
3.08 Filling
When cold, system pressure should be about 1 bar. If while running venting off of air dissolved in the water causes
the pressure of the central heating system to drop below 0,5 bar, the user must utilise a filling loop to bring it
back to the original value. During operation, water pressure in the boiler when hot should be about 1.5 - 2 bars.
After filling, always close and disconnect the filling loop.
Note - If there is a possibility of air pockets forming in certain points of the central heating system flow and return
pipes, you are recommended to fit an air vent valve at these points.
Note - When the boiler is installed below the level of the central heating a system, single check valve should be
fitted in the flow to prevent gravity circulation around the heating system.
3.09 Gas connection
Gas connection should be carried out using a rigid pipe.
The flow at the gas meter should be sufficient for the simultaneous use at full gas rate of all appliances
connected to it. Connect the gas supply to the boiler according to current regulations. The diameter of
the gas tube leaving the boiler is not the determining factor in choosing the diameter of the pipe between
the appliance and the meter. This must be selected in relation to length and pressure drop and in any
instance should not be less than 22mm.
The whole of the gas installation including the meter should be inspected and tested for soundness and
purged in accordance with BS6891-1988.
N.B. - The filling loop will be fitted by the installer in accordance with water by laws at the time of installing
the system. It is NOT a part of the boiler.
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Sentinel Division
Betz Dearborn LTD
Widnes, Cheshire WA8 8ND
Tel: 0151 424 5351
Ferroli F24