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Water hardness
With reference to the specific system volume (e.g. when using
heating water buffer storage tanks), determine which require-
ments apply regarding total hardness of the fill and top-up
water to VDI directive 2035 and the following table.
If partial softening to 6°dH is insufficient according to the pro-
ject specific water hardness diagram, use either an additive or
use only fully desalinated water (with pH stabiliser).
If a boiler is replaced in an existing system, we recommend
installing a dirt trap or filter in the system return, upstream of
the boiler. Flush the system thoroughly.
Depending on the materials used, determine whether the addi-
tion of inhibitors, partial softening or full desalination is the
best method.
Record the filling process (If an additive is used, note this on
the boiler). To prevent gas pockets and bubbles, it is essential
to fully vent the system at maximum operating
temperature.
After 8 to 12 weeks, check and record the pH value. Offer and
conclude a maintenance contract.
Once a year, check the system is operating correctly with re-
gard to pressure maintenance, pH value and the volume of
top-up water used.
HYDRAULIC RESISTANCE
Pressure
Boiler
Drop (mbar)
@ t 20°C
125
303
304
110
305
160
306
160
307
150
Total Heating Capacity (kW)
≤ 50
50 - 200
200 - 600
> 600
Pressure
Drop (mbar)
@ t 11°C
300
220
360
355
300
WATER TREATMENT
These boilers incorporate Al-Si-Mg alloy heat exchangers.
IMPORTANT. The application of any other treatment to this
product may render the guarantee of Ferroli Ltd INVALID.
Ferroli Ltd recommend Water Treatment in accordance with
Guidance Notes on Water Treatment in Central Heating Sys-
tems.
Ferroli Ltd recommend the use of Fernox or Sentinel inhibi-
tors and associated water treatment products, which must be
used in accordance with the manufacturers' instructions.
For further information contact:
Fernox Manufacturing Co. Ltd.
Cookson Electronics,
Forsyth Road,
Sheerwater, Woking,
Surrey,
GU21 5RZ
Tel: 0870 8700362
Sentinel Performance Solutions.
The Heath Business & Technical Park,
Runcorn,
Cheshire,
WA7 4QX
Tel: 0151 424 5351
It is most important that the correct concentration of the water
treatment products is maintained in accordance with the manu-
facturers' instructions.
If the boiler is installed in an existing system any unsuitable
additives MUST be removed by thorough cleansing.
In hard water areas, treatment to prevent lime scale may be
necessary - In this instance the use of artificially softened wa-
ter may be required.
Under no circumstances should the boiler be fired before the
system has been thoroughly flushed.
Hardness (°F)
None
≤ 20
≤ 15
< 0,2
or
12
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