Remeha Avanta Plus Water Quality Instructions

Remeha-Avanta-Plus-P-Series-Water-Quality-Instructions-724365 remeha-avanta-plus-p-series-water-quality-instructions-724365

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Water quality instructions

LTALPER000153a

125488-AA

Contents
1

Preface ........................................................................................................2
1.1

General ..................................................................2

1.2

General points to consider about water
quality ....................................................................2
1.2.1
1.2.2

2

Application ..................................................................................................4
2.1

3

Water treatment ....................................................4

Values ..........................................................................................................5
3.1

Limiting values for heating water ........................5
3.1.1
3.1.2

4

Aluminium heat exchangers ....................................5
Stainless steel heat exchangers .............................5

General regulations ....................................................................................6
4.1

1

New installations .....................................................2
Existing installations ................................................3

Additional note ......................................................6

051110 - 125488-AA

1. Preface

Water quality instructions

1

Preface

1.1

General
In most cases, the boiler and the central heating installation can be
filled with normal tap water and no water treatment will be
necessary. To avoid problems with the boiler and installation, the
limiting values in the tables below must be used for the composition
of the heating water. If one or more conditions cannot be met, we
recommend that you treat the heating water. Any installation must
also be thoroughly flushed before it can be filled and used. If an
installation is not flushed and/or if the water is not of the right quality,
it may invalidate the guarantee.

1.2

General points to consider about water quality
Our boilers are most efficient with clean, good quality tap water. The
most prevalent factors with a negative impact on the quality of heating
water are: oxygen, calcium, sludge, chlorides, minerals and acidity.
The quality of the heating water is measurable through the acidity,
hardness, conductivity, chloride content, iron content, iron oxide
content and content of other components. For example, residue of a
water treatment product used in the past. Apart from the quality of the
heating water, the installation also plays a significant role. When using
materials that are sensitive to oxygen diffusion (such as certain floor
heating hoses, connection hoses, etc.), quite a lot of oxygen may end
up in the heating water during operation. This must be prevented at
all times. Even when the installation is regularly topped up with fresh
tap water, more oxygen and other components (including calcium)
end up in the heating water. So avoid the system being topped up
with fresh tap water without checking. Do not top up with more than
5% of the installation's water content in any one year. A water meter
and a log book for recording information will be needed for this.

1.2.1.

New installations

For new installations, the entire installation (without the central
heating boiler) must be thoroughly flushed before the central heating
installation can be commissioned. This is absolutely crucial. The
flushing helps to remove residue from the installation process (weld
slag, fixing products, etc.) and preservatives (such as mineral oil).
The flushing process can be boosted, if required, by using a cleansing
agent (only to be used by an appropriately trained professional). Do
not soften the water to below 0,5ºdH (1ºf), since decreased softness
is bad for the installation. Water softeners must be used in
combination with an inhibitor.

051110 - 125488-AA

2

1. Preface

Water quality instructions

1.2.2.

Existing installations

Take appropriate measures if the quality of the central heating water
in an existing installation turns out to be inadequate. Installing a filter
is one option to remove the pollution. Several types of filters are
available for the purpose. Use a screen filter to trap larger dirt
particles. This filter is usually installed in the full flow. Use a cloth filter
to filter out finer pollution. This type of filter is installed in a partial flow,
with an additional pump to provide the circulation over the filter.
Another option to remove the dirt is to flush the entire installation
thoroughly. An existing installation can be flushed before a new boiler
is installed. The flushing procedure must be carried out by a trained
professional, since the procedure carries some risk if it is not
performed with due care. Loose dirt can only be removed provided
the flow is strong enough. Each section will need to be tackled
separately. Complications may occur if there is no guarantee that the
sections to be cleaned are sufficiently circulated. The user influences
before and after the cleaning operation must also be properly
controlled. "Special attention must also be paid to ""blind spots"",
where there is only a small amount of flow and a greater amount of
dirt can accumulate.". When the installation is flushed with the aid of
chemicals, these become even more crucial. Any chemicals left
behind can also have negative consequences.
Dirt deposits or limescale are by far most likely to settle at
the warmest point of the installation, which is in the central
heating boiler.
In those cases, the central heating boiler must be cleaned
by an expert with a product that is especially designed for
the purpose.

3

051110 - 125488-AA

Water quality instructions

2

Application

2.1

Water treatment

2. Application

Any water treatment product must be appropriate for all the materials
used in the central heating installation. Consult the supplier of the
water treatment product for further details. Always comply strictly with
the guidelines and operating instructions provided by the supplier of
the water treatment product. This may involve periodic checks and
periodic replacements. Since different water treatment products are
available, it is impossible for us to examine every single product
available in the market. Reputable manufacturers and their products
include:
4 Fernox
4 Sentinel Performance Solution Ltd
Products from other manufacturers may also be used, provided that
the relevant manufacturer guarantees that they are suitable for all
materials used and corrosion-resistant..
WARNING
Applying water treatments requires great care and
attention. If the instructions for the water treatment product
are not followed in full, are interpreted incorrectly and/or if
the product is not dosed properly, this may result in health
risks, or damage to the environment, the central heating
boiler or the central.

051110 - 125488-AA

4

3. Values

Water quality instructions

3

Values

3.1

Limiting values for heating water

3.1.1.

Aluminium heat exchangers

Acidity level (water non-treated)

7 - 9 pH

Acidity level (water treated)

7 - 8,5 pH

Conductivity

≤ 800 µS/cm (25 ℃)

Chlorides

≤ 150 mg/l

Other components

< 1 mg/l

Water hardness

Maximum total water hardness of the installation water and the top-up water(1)

Total installed heat output kW(2) mmol/l

°dH

°f

≤ 70

0,1 - 3,5

0,5 - 20

1 - 35

70 - 200

0,1 - 2,0

0,5 - 11,2

1 - 20

200 - 550

0,1 - 1,5

0,5 - 8,4

1 - 15

> 550

0,1 - 0,5

0,5 - 2,8

1-5

(1) Up to a maximum annual top-up of 5% of the water content of the installation
(2) For installations that are heated at constant high temperatures with a total installed heat output; up to 200 kW a maximum total water hardness
of 8,4°dH (1,5 mmol/l, 15°f) applies and for above 200 kW a maximum total water hardness of 2,8°dH (0,5 mmol/l, 5°f). applies

3.1.2.

Stainless steel heat exchangers

Acidity level (water non-treated)

7 - 9 pH

Acidity level (water treated)

7 - 8,5 pH

Conductivity

≤ 800 µS/cm (25 ℃)

Chlorides

≤ 150 mg/l

Other components

< 1 mg/l

Water hardness

Maximum total water hardness of the installation water and the top-up water(1)

Total installed heat output kW(2) mmol/l

°dH

°f

≤ 70

0,1 - 2,0 (3)

0,5 - 11,2 (3)

1 - 20(3)

> 70

0,1 - 0,5

0,5 - 2,8

1-5

(1) Up to a maximum annual top-up of 5% of the water content of the installation
(2) For installations that are heated at constant high temperatures, a maximum total water hardness of 2,8°dH (0,5 mmol/l, 5°f) applies.
(3) Up to a maximum water content of the installation of 6 litres per kW of potential heat output. For higher water content, the maximum total
hardness is 8,4ºdH (1,5 mmol/l, 15ºf)

5

051110 - 125488-AA

Water quality instructions

4. General regulations

4

General regulations

4.1

Additional note
The water quality of a central heating installation must be checked
regularly, particularly if it is regularly topped up. With treated water,
assistance can be sought from the supplier of the water treatment
product. The user of the installation is responsible for insuring that the
installation water is always of a high quality. If the user wishes to
obtain the required water quality by using water treatment products,
he must take responsibility for the treatment. We would advise the
user to record all water treatments carried out in a good log book. Any
work that was started or completed on the central heating boiler and
installation should also be recorded in the log book.

051110 - 125488-AA

6

4. General regulations

7

Water quality instructions

051110 - 125488-AA

Water quality instructions

051110 - 125488-AA

4. General regulations

8

© Copyright
All technical and technological information contained in these technical instructions,
as well as any drawings and technical descriptions supplied, remain our property
and shall not be multiplied without our prior consent in writing.
051110

125488



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