Centrometal CentroPelet ZV16 Instrucciones Técnicas página 47

plant;
• open gradually the system filler tap, checking
that all automatic purging air valves installed, are
operating properly;
• close the radiators venting valves as soon as
water flows;
• check on the manometer placed on the system
that the pressure reaches about 1 bar (applies
only to systems with a closed vessel, to consult
any local regulations or standards that allows it);
for open vessel, the reintegration is automatic
through the vessel itself;
• close the system filler cock and again release
the air through the vent valves of the radiators;
Water Characteristics
The characteristics of the water used to fill
the system are very important to prevent the
build-up of mineral salts and the formation of
incrustations along the pipes, in the boiler and in
the heat exchangers.
Therefore, please get your plumber's advice
concering:
• Hardness of water circulating in the system, to
prevent problems of incrustation and limescale,
especially in the domestic water heat exchanger
(>25° French).
• Installation of a water softener (if water hardness
> 25° French).
• Filling the system with treated water
(demineralised).
If you have very extensive system, with a large
amount of water, or which require frequent
refilling, it is recommended the installation of
water softening system. It 'should be noted that
the encrustations drastically reduce performance
because of their low thermal conductivity.
freshwater (0-12)
water medium (12-20)
hard water (20 - 30)
very hard water (over 30)
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