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1.22 WATER TREATMENT SYSTEM FILLING.
As already mentioned in the previous paragraphs, a
treatment of the thermal and domestic system water
is required, in compliance with the local standards
in force.
The parameters that influence the duration and prop-
er operation of the heat exchanger are the water's PH, total
hardness, conductivity, and oxygen, together with the system's
processing residues (any welding residues), any oil present and
corrosion products that can, in turn, cause damage to the heat
exchanger.
In order to prevent this from happening, you are recommended
to:
- Before installation on new systems as well as old ones, clean the
system with clean water to eliminate solid residues contained
therein
- Clean the system with a chemical treatment:
- Clean the new system with a suitable cleaning device (for
example Sentinel X300, Fernox Cleaner F3 or Jenaqua 300)
combined with thorough washing.
- Clean the old system with a suitable cleaning device (for ex-
ample Sentinel X400 or X800, Fernox Cleaner F3 or Jenaqua
400) combined with thorough washing.
- Check the maximum total hardness and quantity of filling
water referring to the graphics (Fig. 30); if the contents and
hardness of the water are below the indicated curve, no specific
treatment is required; otherwise, to limit the content of calcium
carbonate, you must provide for water-filling treatment.
- Should you be required to provide for water treatment, this
should be carried out by completely desalinating the filling
water. As opposed to the complete softening process, desalinat-
ing the water completely not only removes hardening agents
(Ca, Mg), but also eliminates all other minerals to reduce
water-filling conductivity up to 10 microsiemens/cm. Given its
low conductivity, desalinated water does not only prevent the
formation of lime scale, but also serves as protection against
corrosion.
- Insert a suitable inhibitor / passivator (for example Sentinel
X100, Fernox Protector F1, or Jenaqua 100); if required, also
insert appropriate antifreeze (such as for example Sentinel
X500, Fernox Alphi 11 or Jenaqua 500).
- Check electrical conduction of the water, which should be
higher than 2000 µs/cm in the case of treated water and lower
than 600 µs/cm in the case of non-treated water.
- To prevent corrosion, the water system's PH should be between
6.5 and 8.5.
- Check the maximum content of chlorides, which should be
less than 250 mg/l.
N.B.: for quantities and methods of use of water-treatment
products, refer to the instructions provided by their manu-
facturer.
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Water total hardness °F
N.B.: the graph refers to the entire life cycle of the system. There-
fore, also consider scheduled and unscheduled maintenance,
which involves emptying and filling the said system.
1.23 SYSTEM FILLING.
Once the boiler is connected, proceed with system filling via the
filling cock (Part. 1 Fig. 32). Filling is performed at low speed to
ensure release of air bubbles in the water via the boiler and central
heating system vents.
The boiler has a built-in automatic vent valve on the pump. Check if the
cap is loose. Then open the radiator vent valves.
Close radiator vent valves when only water escapes from them.
Close the filling valve when the boiler pressure gauge indicates
approx. 1.2 bar.
N.B.: during these operations, enable the automatic vent func-
tions on the boiler.
1.24 FILLING THE CONDENSATE DRAIN TRAP.
On first lighting of the boiler, flue gas may come out the conden-
sate drain; after a few minutes' operation check that this no longer
occurs. This means that the drain trap is filled with condensate to
the correct level preventing the passage of flue gas.
1.25 GAS SYSTEM START-UP.
To start up the system, refer to the technical standards in force.
In particular, for new gas systems:
- open windows and doors;
- avoid presence of sparks or naked flames;
- bleed all air from pipelines;
- ensure the internal system is properly sealed according to the
specifications set forth by technical regulations in force.
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