Remeha Water Quality, P SERIES Water Quality Instructions

Water quality instructions

125488-AA

LTALPER000153a

Contents

1 Preface ........................................................................................................2

1.1 General ..................................................................2

1.2 General points to consider about water

quality ....................................................................2

1.2.1 New installations .....................................................2

1.2.2 Existing installations ................................................3

2 Application ..................................................................................................4

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

3 Values ..........................................................................................................5

3.1 Limiting values for heating water ........................5

3.1.1 Aluminium heat exchangers ....................................5

3.1.2 Stainless steel heat exchangers .............................5

4 General regulations ....................................................................................6

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

051110 - 125488-AA

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

1. Preface

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

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.

051110 - 125488-AA

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