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Instructions for the installer
3.15 -
WATER TREATMENT
The chemical/physical features of the heating system's water
are fundamental for the boiler's correct operation and safety.
Among the inconvenients caused by the bad quality of the
feeding water, the most frequent and the most serious is the
incrustation of the boiler thermal exchange surfaces.
Less frequent, but also serious, is the hydraulic circuit
surfaces.
It is ascertained that the boiler incrustations, due to their low
thermal conductivity, highly reduce the thermal exchange,
if with a thickness of some millimetres and provoque a very
dangerous localised overheating.
We suggest to make the water treatment of the heating circuit
in the following cases:
a) When the hardness of the water is higher than 9 grains
(15°f);
b) For C.H. installations with large water content;
c) Renewal of the water system due to uncontrolled leakages;
d) Subsequent refilling of the system due to maintenance
works on the installation;
e) Presence of different metals in the hydraulic circuit.
The scope of this treatment is finalized for eliminating or
substantially reducing the following problems:
-
lime scale deposit
-
corrosion sludge
-
deposits
-
microbiological growths (moulds, bacteria etc.)
24
An appropriate treatment of the supply water will prevent
the above stated problems and will maintain the correct
operation and efficiency of the generator in time.
For this purpose it will be necessary to fix the following
chemical-physical characteristics of the water:
PH include between 6,5 and 8
Hardness 6 ÷ 9 grains (9 ÷ 15 fr)
even
Water hardness
When there is a water hardness of more than 6 to 9 grains
hardness a water softener must be installed.
Sediment
If there is sediment in your domestic water supply sediment
filter or other suitable device should be used to remove it.
THE INSTALLATION MUST BE FORESEEN ON THE RETURN
PIPE OF THE PRIMARY CIRCUIT DOWNSTREAM OF THE
CIRCULATING PUMP.
WARNING!
All necessary precautions must be taken for
preventing the formation and localization of
oxygen in the system's water. For this reason,
ensure yourself that the plastic piping used in
underfloor heating systems is impermeable
to oxygen.
If any anti-freeze solutions are used ensure that they are
compatible with aluminium and any other boiler
components and materials.
WARNING!
Any damage caused to the boiler due to the
formation of lime scale or by corrosive water
will not be covered by the warranty.
WARNING
Appropriate steps must be taken to ensure
the indirect tank water heater does not be-
come plugged by scale caused by hard wa-
ter or sediment.
If the indirect tank water heater becomes
plugged by either scaling from hard water of
sediment it is not the responsibility of LATT-
NER.
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