4 Commissioning [specialist]
2020/10
997655810x-mub-en – V08
11
4
Commissioning [specialist]
Please observe the following safety instructions regarding the commissioning of the station:
WARNING
Risk of burning and scalding!
The valves and fittings may heat up to more than 100 °C. Therefore, do not clean
or fill the system when the collectors are hot (intense sunshine). Please note that
hot solar fluid leaks from the pressure relief valves in case of too high system
pressure! During venting the solar fluid may escape as vapour and result in
scalding!
Flush and fill the system only when the collector temperatures are
below 70 °C.
ATTENTION
Risk of frost!
It often happens that solar systems cannot be completely drained after flushing. Thus, there is
a risk of frost damage later on when flushing with water. Therefore, only use the solar fluid
used later on for flushing and filling the solar installation.
Use a water/propylene glycol mixture with max. 50% of propylene glycol as solar fluid.
ATTENTION
Note regarding the commissioning sequence
During commissioning, fill the heating circuit first and the solar circuit afterwards.
This guarantees that the heat possibly absorbed by the collectors during commissioning can
be dissipated.
ATTENTION
Note regarding the expansion tank
To prevent any dirt particles contained in the solar installation from being flushed into the
expansion tank, some manufacturers recommend disconnecting the expansion tank from the
solar circuit during flushing and filling. Please observe the instructions of the manufacturer.
