Chemical and Physical Treatments, what to do

In addition, we will take care to verify by means

of the HARDNESS KIT the total hardness of the

water used for the loading of the system which,

as required by the UNI 8065 concerning the “Tre-

atment of water in heating systems for civil use”,

should never exceed 15 °f to avoid problems re-

lated to the precipitation of limestone; otherwise

the law requires the installation of a dispenser

of polyphosphates (Series WL-DOSP, which will

protect the sanitary exchanger ) provided DM

26/15. They in fact have a duty to protect metals

from corrosion, as well as prevent the formation

of limescale in systems without a water softener.

Sanitary and

thermal system

6 Descailing/Restoration

and passivation of a bitermic system

Once the restoration (pickling) of the circuit has

been carried out, it shall be drained and refilled with

residual acidity neutralizing agent NEUTRAL by

adding 3 - 5 % in respect to the circulating liquid for

at least a couple of hours.

At this point we are going to drain again the system,

taking care to perform subsequently a good

backwashing with water until this comes out clean.

Later we will take care to protect and preserve the

plant from the built of new corrosion phenomena

during the time by the addition into the circuit water

of the filming product FILMAx+Thermakil in ratio

of 1 - 2 % Even in this case, we recommend the

application of the magnetic filter - dirt separator

MAG- NEx HP Series as a further guarantee of

protection of the boiler and system.

New and not new heating

and sanitary systems

Limestone problems

7 How to prevent and finally solve

such problem with the application of

polyphosphate dispensers prescribed

by DM 26/15

1 - 2 hours

In the case of an old thermal

system (even only in part: eg.

new boiler, old piping) with

important presences of iron

deposits and corrosion residues

created during the years or with

damages of metallic materials

making up the plant, it is always

a good idea to perform pickling,

this means the cleaning by

the oxides and the removal of

sludge.

We recommend to make a

pickling of the circuit through

additing ZINCONEx (powder

product easily dispersible in

water) in the ratio of 3 - 5 %

compared to the total circulating

liquid in the system and leaving

it for a maximum of 2 - 3 hours.

Fresh water

Medium water

Hard water

Very hard water

Extremely hard water

0 - 12 °f

12 - 20 °f

20 - 30 °f

30 - 40 °f

> 40 °f

54

The formation of the limestone is a main problem

not only in our country, particularly rich in calcium

carbonate and magnesium.