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5.12.5.1. 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 solar thermal system components from overheating. The pump is turned on again
when the collector temperature drops below the value “
AS Toff
”.
With the system protection on, there are increased stagnation temperatures in the solar
collector and therefore an increased pressure in the system. The operating manuals from
the system components must be observed.
5.12.5.2. Collector protection
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 collector temperature drops below “
KS Toff
” or the value “
KS Tmax Sp.
”
(5.12.5.2.3.) on the solar 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. As default, the values from the system protection (depending
on the maximum temperature of the storage or other components) are higher than the
collector protection.
5.12.5.3. Recooling
At the end of a sunny day the temperature in a storage tank may easily reach high values. In
order to prevent further temperature increase the next day, excess energy can be released into
the air via collectors under cloudy conditions or after sunset. If the temperature in the storage
tank exceeds the value “
Return cooling Tref
” and the collector is at least by 20 °C cooler than
the storage tank, the solar pump starts. The storage tank is then cooled down until the “
Return
cooling Tref
” is reached.
Energy is lost through the collector through this function! The recooling should only
be activated in cases of exception, with low heat consumption, for example during
holidays.
5.12.5.4. 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! Regulus solar thermal
system use antifreeze fluid only and the frost protection is off.
5.12.5.5. Collector alarm
If the “Collector Tmax” 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.
5.12.6. Collector sensor
The temperature sensor placed at a solar collector – a higher temperature is expected than
at the storage sensor.
5.12.7. Storage sensor
Temperature sensor for a solar tank (e.g. a thermal store) – a lower temperature is expected
than at the collector sensor.
5.17. Gas boiler (Burner)
The menu is available only if the Burner function is assigned to an output in menu
7. Special functions.
Switching on the boiler when there is a request to charge a thermal store (demanded by
a heating circuit), or to heat up DHW.
