5. Protective Functions
The 'Protective functions‘ can be used by specialists to activate and set vari-
ous protective functions.
By no means does the controller replace the safety appliances on
site!
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 is turned on again when the value “AS Toff” on
the collector has not been met.
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 col-
lector. 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 or KS SB
Max on the pool 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 pro-
tection (depending on the maximum temperature of the storage or other components) are higher than the collector pro-
tection.
Recooling
In the system hydraulics with solar, excess energy is guided from the storage back to the collector with an activated return cooling
function. 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 col-
lector 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.
Seizing Protection
If the anti-seizing protection is activated, the controller switches the heat pump and the mixer on/off at 12:00 noon or weekly on
Sundays at 12:00 for 5 seconds to prevent seizing of the pump/valve after long periods of inactivity.
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