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Betriebsempfehlungen
Operating tips
Consigli per la messa in funzione
Recommandations d'emploi
Recomendaciones para el funcionamiento
Flushing and filling
For safety reasons, charging is to be carried out only when there is no direct sunlight or when the collectors are
covered. Especially in areas liable to freezing, an anti-freeze/water mixture of up to 40% must be used. To protect
materials from excessive thermal load, the system should be charged and commissioned as soon as possible, after
4 weeks at the latest. If this is not possible, the flange seals should be renewed before commissioning to prevent
leaks.
Attention:
Antifreeze that is not pre-mixed must be mixed with water prior to filling!
Recommended antifreeze for flat plate collectors: FS
30 % proportion of antifreeze (30%/H20) - freezing point: - 13 ° C / solidification point: - 16 ° C
40 % proportion of antifreeze (60%/H20) - freezing point: - 22 ° C / solidification point: - 26 ° C
50 % proportion of antifreeze (50%/H20) - freezing point: - 32 ° C / solidification point: - 44 ° C
It may not be possible to completely empty collectors once they have been filled. For this reason, collectors exposed
to frost should only be filled with a water/antifreeze mixture, also for pressure and function tests. Alternatively, the
pressure test can also be carried out using compressed air and leak detection spray.
Operating pressure
The maximum operating pressure is 10 bar.
Bleeding
The system must be bled:
- when commissioning the system (after filling the collectors)
- 4 weeks after commissioning
- when necessary, e.g. if there are malfunctions
WARNING:
Risk of scalding due to steam and hot heat transfer fluid
Only operate the bleeding valve if the temperature of the heat transfer fluid is < 60° C.
When bleeding the system, the collectors must not be hot! Cover the collectors and, if possible, bleed the system
in the morning.
Check heat transfer fluid
The heat transfer fluid must be checked every two years with regard to its antifreeze and pH value.
- Check antifreeze using antifreeze tester and replace or refill if necessary!
Target value is ca. - 25° C and - 30° C depending on climatic conditions.
- Check pH value with a pH indicator rod (target value approx. pH 7.5):
If the limit pH value is less than ≤ pH 7, replace the heat transfer fluid.
Maintenance of the collector
The collector or the collector array must be inspected visually, once a year, for any damage, leaks and
contamination. Condensate can form in the collector after commissioning and during times of the year with strong
outdoor temperature fluctuations. This condensate disappears however after a few hours exposure to sunlight.
Additional recommendations on operation and maintenance can be found in SONNENKRAFT'S general
documentation and instructions on commissioning and maintenance.
GB
SOLAR ENERGY MADE BRIGHTER
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