If the heating is properly filled, no deposits can form and the corrosion is reduced to a minimum. Should damage nevertheless occur, there are various reasons. The causes of heating damage can be: Too much oxygen in the water, mud has formed or/and the ph is in the acidic range.
The VDI guideline published by the Association of German Engineers VDI 2035 places demands on the fill water, both the scale formation as well as (the oxygen as well) affect electrical conductivity. A Pure water softening is therefore not sufficient.
|electric conductivity at 25° C||µS/cm||< 100|
|german hardness at 25° C||°dH||< 3|
|pH value at 25 ° C||8,2 - 10 / 8,2 - 8,5 (aluminium)|
Fill in cleaner and leave it in there for at least one week. Skip this step if corrosion products can be flushed out.
New since 2020: Existing systems often have to deal with silting and magnetite deposits. To remove these, the heating engineer often only has the option of rinsing the system several times and completely changing the fill water. This complex process primarily takes time. In addition, despite multiple flushing, there is always some dirt left in the pipes. The mobile filter station from Magnetic, with which dirt is filtered out of the system water, offers a reliable and clean alternative.
*Step 1&2 are not nescessary if system is filled for the first time
Fill system with demineralized water in case it is a new system or a refilling after cleaning and flushing. Circulation demineralization in case system water is not too contaminated. To comply with the German standard, we recommend only using demineralized water. Magnetic has developed special tools with which they can easily produce demineralized water.
Values should be <100 μS/ cm and pH around 7. During the following weeks the self-alkalization process will bring the pH up to the desired 8,2-8,5. The pH value and the conductivity of the heating water should be checked again after 6 months to observe the development of the alkalization.
Source: magnetic GmbH & Co. KG