Bedienungsanleitung Unical MODULEX EXT 100 (Seite 7 von 56) (Englisch)

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General Information

1.8 - WATER TREATMENT

The chemical-physical characteristics of the ﬁlling water and

reinstatement water in heating systems are of fundamental

importance for guaranteeing correct and safe boiler operation.

Before ﬁlling the CH circuit with water, it is necessary to analyse

the water and decide for a proper treatment.

The purpose of this treatment is ﬁnalized to eliminate or sub-

stantially reduce the following problems:

- lime scale deposit

- corrosions

- deposits

- biological growths (moulds, bacteria, algae, fungi, etc)

The chemical treatment of the network water enables the

prevention of these problems and guarantees safe boiler

operation and economical advantages, in terms of mainte-

nance and global thermal efﬁciency.

The chemical analysis of the water enables us to obtain a lot

of information on the system’s condition and state of “health”.

It is essential to avoid any problems with the boiler.

The pH is a measure of the acidity or alkalinity of a solution.

The pH scale has a range of 0-14, where 7 is neutral.

Values inferior to 7 indicate acidity, values above 7 indicate

alkalinity.

The ideal pH value for water in heating systems ﬁtted with

aluminium boilers is between 6,5 and 8, with a hardness

of 15°F.

In heating systems where the water has a value outside this ran-

ge, this considerably accelerates the destruction of the protective

oxidized layer which naturally develops inside the aluminium

bodies: if the pH is below 6, acidity is present, if it is above 8,

the water is alkaline or it is caused by an alkaline treatment (for

example phosphate or glycol used as an antifreeze) or in several

cases it is due to the natural formation of alkaline in the system.

Vice versa, if the pH value is between 6,5 and 8, the aluminium

surfaces of the boiler body are passivated and protected from

further corrosive attacks.

To minimize corrosion it is essential to use a scale inhibitor,

however in order for this to function correctly, the metallic

surfaces have to be clean.

The best corrosion inhibitors on sale also contain a pro-

tective system for aluminium which acts by stabilizing the

water’s pH value, preventing unforeseen variations.

We recommend that the heating system’s water pH value is

systematically controlled (minimum twice a year). In order

to do this, it is not necessary to run a chemical analysis in a

laboratory, but it is sufﬁcient to use a simple analytical ‘kit’

contained in portable cases, easily found on sale.

Therefore, prior to ﬁlling the heating system with water it will be

necessary to ﬁt the devices indicated in the ﬁgure below.

THE CONNECTION MUST BE FITTED ON THE

PRIMARY CIRCUIT’S RETURN PIPE DOWN-

STREAM OF THE CIRCULATING PUMP

All the necessary precautions must be taken in order to avoid

the formation and localization of oxygen in the system’s water.

For this reason, the plastic pipes used in underﬂoor heating

systems must be impermeable to oxygen.

If any antifreeze solutions are used ensure yourself that they are

compatible with aluminium and with any other components and

materials ﬁtted on the system.

WARNING!

ANY DAMAGE CAUSED BY THE BOILER,

DUE TO THE FORMATION OF LIME SCALE

OR DUE TO CORROSIVE WATER WILL INVA-

LIDATE THE APPLIANCE WARRANTY.

1. Ball valve

2. Inspection pocket

3. Filling-up group

4. Disconnector

5. Scale reducing device

6. Litrecounter

(recommended)

7. “Y” ﬁlter

EXAMPLE OF SCALE REDUCING DEVICE CONNECTION FOR WATER TREATMENT

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