I-30
F-084392_EN • B
P
roduct
I
nstallatIon
Water Quality Requirements to Prevent
Scaling and Corrosion
To prevent the formation of scale and sludge in a
closed heating circuit through the penetration of
oxygen and carbonates, follow the recommenda-
tions below:
î
Before fi lling the system, clean it according to
standard EN14336. Chemical cleaning agents
can be used.
î
If the circuit is in bad condition, or the cleaning
operation was not effi cient, or there is a large
volume of water in the system (e.g. cascade),
it is recommended to separate the appliance
from the heating circuit using a plate-to-plate
heat exchanger or an equivalent accessory. In
that case, it is recommended to install a hydro-
cyclone or magnetic fi lter on the system side.
î
Limit the fi ll operations. To control the quantity
of water added into the system, install a water
meter on the fi lling line of the primary circuit.
No more than 5% of the total content of the
system is allowed annually.
î
Automatic fi lling systems are not recom-
mended unless the fi ll frequency is checked
and the levels of scale and corrosion inhibitor
are maintained at an appropriate level.
î
If the system needs to be refi lled frequently,
check for leaks in the primary circuit.
î
Inhibitors may be used according to stand-
ard EN 14868.
î
An air separator (on the appliance supply
circuit) combined with a dirt separator (up-
stream of the appliance) must be installed
according to the manufacturer’s instructions.
î
Additives can be used to keep the oxygen in
solution in the water.
î
Use the additives in accordance with the in-
structions of the manufacturer of the water
treatment product.
Water Hardness
î
If the hardness of the fi ll water is higher than
20° fH (11,2° dH), soften it. At commission-
ing, the water should be soft.
î
Check the water hardness regularly and en-
ter the values in the maintenance log sheet
(provided at the end of the manual).
Water Parameters
î
In addition to the oxygen and the water hard-
ness, other parameters of the water must be
checked. Treat the water if the measured val-
ues are outside the range of the table below.
î
In case the system operates at low temper-
ature, it may be necessary to use an agent
that inhibits the spread of bacteria.
Water Parameters
Range
Acidity
8.2 < pH < 9.0
Conductivity
< 400 μS/cm (at 25°C)
Chlorides
< 125 mg/l
Iron
< 0,5 mg/l
Copper
< 0,1 mg/l
Water hardness
°fH
°dH
mmolCa(HCO3)2 / l
Very soft
0 - 7
0 - 3.9
0 - 0.7
Soft
7 - 15
3.9 - 8.4
0.7 - 1.5
Fairly hard
15 - 25
8.4 - 14
1.5 - 2.5
Hard
25 - 42
14 - 23.5
2.5 - 4.2
Very hard
> 42
> 23.5
> 4.2
