Feed Water Treatment - Immergas VICTRIX PRO 1 I Series Technical Sheet

VICTRIX PRO 1 I
27
Treating the supply water allows you to prevent problems and
maintain the functionality and efficiency of the generator
over time.
Art. 4 of Italian Pres. Decree 59/09 – in force since 25/06/09
and implemented with Italian Lgs. D. 192/05 as amended or
added. – requires all building categories to treat the system's
water, whether they are "new buildings and renovated existing
buildings" or "new installation and renovation of heating sys-
tems or boiler replacement". This requirement is in addition to
the pre-existing one set forth in Italian Pres. Decree 412/93 as
amended and added, for new systems with an overall output
greater than or equal to 350 kW.
According to Italian Pres. Decree 59/09 it is compulsory to treat
the water in the system:
- by more than 25 French degrees, if the system does not produce
domestic hot water,
- by more than 15 French degrees, if the system produces do-
mestic hot water, through chemical conditioning treatment
for outputs of < 100 kW – or softening for outputs between
100 and 350 kW (ref. UNI 8065).
UNI 8065:
- Assumes that, prior to treatment, the water intended to supply
heating systems for civil use has the same characteristics as
drinking water.
- Requires the design phase to include treatment or chemical
conditioning systems to provide the water in the circuit with
the following characteristics:
- clear appearance;
- pH greater than 7 (but less than 8 for systems with alumin-
ium radiators);
- an iron content of less than 0.5 mg/kg;
- a copper content of less than 0.1 mg/kg.
As for hot water central heating systems, according to the
standard:
Example of water treatment unit
1 2 3

FEED WATER TREATMENT

4 5 2
- for all systems, it is necessary to provide chemical condition-
ing. For systems of > 350 kW it is necessary to install a safety
filter (recommended in any case) and, if the water has a total
hardness of more than 15 French degrees, a water softener to
bring the hardness back within the range;
- the filling and topping-up water must be clear and have a total
hardness of 15 French degrees.
N.B.: to maintain optimal characteristics of the water in the
central heating systems over time, we recommend using and
placing specific liquid inhibitors in the circuit.
As for domestic hot water production systems, the standard
requires:
- a safety filter to be installed, to protect the systems;
- based on the characteristics of the water, a water softener
and/or proportional automatic chemical conditioning dosing
system to be installed (food-grade anticorrosive and/or hard-
ness stabilising agents). Treatment systems and points where
conditioning agents are added must all be upstream of the hot
water generator;
- the following characteristics (appearance - hardness) of the
system feed water:
a) up to 25 French degrees, in terms of temporary hardness,
it is possible to use either softening or hardness and/or anti-
corrosive chemical stabilisation conditioning;
b) softening is compulsory when temporary hardness exceeds
25 French degrees;
c) whenever necessary, softening will be integrated with
anticorrosive and/or descaling chemical conditioning.
6 7 1
KEY:
1 - Ball valve
2 - Sampling point
3 - Filling unit
4 - Disconnector
5 - Water treatment unit
6 - Litre counter (recom-
mended)
7 - "Y" strainer
37