Protective functions for Solar
The protection functions for Solar are not displayed in the “Protective functions” menu, but rather as a sub-menu in the set-
tings from the solar function, See " Solar " on page 50.
System protection
Priority protection function
The system protection should prevent an overheating of the components installed in the system through the forced shut down of the
solar circulation pump. If the value “AS Ton” on the collector has been exceeded for 1 Min. the pump will be turned off and not turn on
again in order to protect the collector, for example, from steam. The pump will only be switched on again, when the collector tem-
perature falls below “SP Toff”.
With the system protection (on), there are increased standstill temperatures in the solar collector and therefore an increased
pressure in the system. The operating manuals from the system components must be observed.
Collector protection
Priority protection function
The collector protection prevents the collector from overheating. A forced switching of the pump makes sure that the collector is cooled
through the storage. If the value “KS Ton” is exceeded on the collector, the pump will be turned on in order to cool the collector. The
pump is shut down if the value “KS Toff” on the collector is not met or the value “KS Tmax Sp.” on the storage is exceeded.
System protection has priority over collector protection! Even if the switch requirements for the collector protection are
present, the solar circulation pump is turned off once “AS T on” is reached. Normally the values from the system protection
(depending on the maximum temperature of the storage or other components) are higher than the collector protection.
Recooling
In the system hydraulics with solar, excess energy is guided from the storage back to the collector with an activated return cooling func-
tion. This only occurs if the temperature in the storage is greater than the value “Return cooling Tref” and the collector is at least 20 °C
colder than the storage and until the storage temperature has fallen below the value “Return cooling Tref”. For muti-storage systems,
the return cooling applies to all storage.
Energy is lost through the collector through this function! The recooling should only be activated in cases of exception, with
low heat acceptance, for example, during vacation.
Frost Protection
A 2-level frost protection function can be activated. In level 1, the controller turns on the pump every hour for 1 minute if the collector
temperature is below the set value “Frost Level 1”. If the collector temperature continues to decrease to the set value “Frost Level 2”,
the controller will turn on the pump without disruption. If the collector temperature exceeds the value “Frost level 2” by 2 °C, the pump
will turn off again.
Energy is lost through the collector through this function! It is normally not activated for solar systems with antifreeze. The
operating manuals from the other system components must be observed.
Collector alarm
If this temperature at the collector sensor is exceeded when the solar pump is turned on, a warning or error notification is triggered.
There is a corresponding warning in the display.
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