Flues, Chimneys, Chimney Pots And Terminals; Water Treatment System Filling - Immergas Victrix Tera 28 1 Instructions And Warnings

1.23 FLUES, CHIMNEYS, CHIMNEY POTS AND
TERMINALS.
The flues, chimneys and chimney caps for the evacuation of com-
bustion products must be in compliance with applicable standards.
Chimneys and roof-installed exhaust terminals must comply with
the outlet height and with the distance from technical volumes
set forth by the technical standards in force.
Positioning the wall flue exhaust terminals.
The exhaust terminals must:
- be installed on external perimeter walls of the building;
- be positioned according to the minimum distances specified in
current technical standards.
Combustion products exhaust of natural draught or fan assisted
appliances in open-top closed environments.
In spaces closed on all sides with open tops (ventilation pits,
courtyards etc.), direct combustion product exhaust is allowed for
natural draught or fan assisted gas appliances with a heat input
range from 4 to 35 kW, provided the conditions as per the current
technical standards are respected.
Water total hardness °F
N.B.: the graph refers to the entire life cycle of
the system. Therefore, also consider scheduled
and unscheduled maintenance, which involves
emptying and filling the said system.

1.24 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 proper oper-
ation 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.
To prevent damage, it is recommended to:
- before installation on new systems as well as old ones, clean
the system with clean water to eliminate solid residues con-
tained 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
example 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. 33); if the contents and
hardness of the water are below the indicated curve, no spe-
cific treatment is required; otherwise, to limit the content of
calcium carbonate, you must provide for water-filling treat-
ment.
- 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, desal-
inating 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 be-
tween 7.5 and 9.5, measured at a temperature between 20-
25°C.
- 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 man-
ufacturer.
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