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Flushing and charging
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 is pre-mixed, must not be diluted with water prior to filling!
Recommended antifreeze for flat plate collectors: Viridian Solar Fluid (Code: V225)
Pre-mixed 45% proportion of antifreeze (55%/water) - freezing point: -28°
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 the antifreeze mixture, also for pressure and function tests.
Alternatively, the pressure test can also be carried out using compressed air and leak detection spray.
Installing the temperature sensor
The temperature sensor should be installed in the sensor sleeve nearest to the collector array flow. To ensure
optimal contact between the sensor and the surrounding environment, the gap between the sensor sleeve and
the sensor element should be filled with a suitable conducting compound. All materials used for installing
temperature sensors (sensor element, conducting compound, cables, sealing and insulating materials) must be
suitably temperature resistant (up to 250° C).
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
Warranty claim only in conjunction with the supplier's original frost protection and correct installation,
commissioning and maintenance. Installation by qualified personnel with strict adherence to the instructions is a
prerequisite for the justification of claims.
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Betriebsempfehlungen
Consigli per la messa in funzione
Recommandations d'emploi
Recomendaciones para el funcionamiento
Operating tips
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