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Flushing and filling
Flushing and filling
For safety reasons, you should only fill the collectors when the sun is not shining (or cover the collectors).
For safety reasons, you should only fill the collectors when the sun is not shining (or cover the collectors).
In regions subject to frost, you should use a mixture of (FS) antifreeze with water (40% antifreeze) for flat plate
In regions subject to frost, you should use a mixture of (FS) antifreeze with water (40% antifreeze) for flat plate
collectors. With evacuated tube collectors, you should use non-mixable, pre-mixed antifreeze (FSV).
collectors. With evacuated tube collectors, you should use non-mixable, pre-mixed antifreeze (FSV).
Caution:
Caution:
FS antifreeze must be mixed with water before filling!
FS antifreeze must be mixed with water before filling!
Recommended antifreeze for flat plate collectors: FS
Recommended antifreeze for flat plate collectors: FS
Recommended antifreeze for evacuated plate collectors: FSV
Recommended antifreeze for evacuated plate collectors: FSV
It may not be possible to completely empty collectors once they have been filled. For this reason, collectors
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, even for pressure and function tests.
exposed to frost should only be filled with a water/antifreeze mixture, even for pressure and function tests.
Installing the sensor
Installing the sensor
The temperature sensor should be installed in the sensor sleeve nearest to the collector array feed. In order to
The temperature sensor should be installed in the sensor sleeve nearest to the collector array feed. In order to
guarantee optimal contact, the gap between the sensor sleeve and sensor element should be filled with a suitable
guarantee optimal contact, the gap between the sensor sleeve and sensor element should be filled with a suitable
conducting compound. All materials used for installing the sensor (sensor element, conducting compound, cables,
conducting compound. All materials used for installing the sensor (sensor element, conducting compound, cables,
sealing and insulating materials) must be suitably temperature resistant (up to 250° C).
sealing and insulating materials) must be suitably temperature resistant (up to 250° C).
Operating pressure
Operating pressure
The maximum operating pressure is 10 bar.
The maximum operating pressure is 10 bar.
Bleeding
Bleeding
The system must be bled:
The system must be bled:
- on commissioning (after filling)
- on commissioning (after filling)
- 4 weeks after commissioning
- 4 weeks after commissioning
- when necessary, e.g. if there are malfunctions.
- when necessary, e.g. if there are malfunctions.
Warning:
Warning:
Risk of scalding due to hot heat transfer fluid!
Risk of scalding due to hot heat transfer fluid!
Do not operate the bleeding valve unless the temperature of the heat transfer fluid is < 60° C.
Do not operate the bleeding valve unless the temperature of the heat transfer fluid is < 60° C.
The collectors may not be hot when you bleed the system! Cover the collectors and bleed the system in the
The collectors may not be hot when you bleed the system! Cover the collectors and bleed the system in the
morning if possible.
morning if possible.
Checking the heat transfer fluid
Checking the heat transfer fluid
The heat transfer fluid should be checked every two years for antifreeze and pH value.
The heat transfer fluid should be checked every two years for antifreeze and pH value.
- Check antifreeze using antifreeze tester (target value approx. - 30° C): If the
- Check antifreeze using antifreeze tester (target value approx. - 30° C): If the
limit value of ≥ - 26° C is exceeded, replace/replenish the heat transfer fluid.
limit value of ≥ - 26° C is exceeded, replace/replenish the heat transfer fluid.
- Check the pH value with a pH indicator rod (target value approx. pH 7.5): If the pH value is ≤ pH 7, replace
- Check the pH value with a pH indicator rod (target value approx. pH 7.5): If the pH value is ≤ pH 7, replace
the heat transfer fluid.
the heat transfer fluid.
Maintenance of the collector
Maintenance of the collector
The collector or the collector array must be inspected visually, once a year, for any damage, leaks and
The collector or the collector array must be inspected visually, once a year, for any damage, leaks and
contamination.
contamination.
Additional recommendations on operation and maintenance can be found in the manufacturer's general
Additional recommendations on operation and maintenance can be found in the manufacturer's general
documentation and instructions on commissioning and maintenance.
documentation and instructions on commissioning and maintenance.
14
Betriebsempfehlungen
Consigli per la messa in funzione
Recommandations d'emploi
Recomendaciones para el funcionamiento
Operating tips
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