Unical PK 300 X 2S Instruction Manual download pdf (Page 24)

Instructions for the installer

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3.15 - 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

substantially 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

maintenance 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

range, 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

protective 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 DOWNSTREAM 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 INVALIDATE 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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Unical PK 300 X 2S Instruction Manual Page 24

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