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738.955 | 10.40
EN
energy systems also contain an additional corrosion
inhibitor.
The anti-freeze symbol appears and the display shows
the following message.
7.6 Holiday func
tion
The holiday function is used to cool down a completely
heated storage tank again via the collector. The stor-
age tank can heat up too much, e.g. if no hot water
is extracted from the storage tank over an extended
period of time (holiday) of intense solar irradiance.
A completely heated storage tank subjects the solar
energy system to a higher thermal load.
If the holiday function is activated, the storage tank
is cooled as follows: If the storage tank temperature
rise
s to 10 K below the set maximum storage tank
temperature, the controller attempts to discharge
the lower section of the storage tank to 35 °C (e.g. at
night). To do so, the pump is automatically switched
on once the collector is 8 K colder than the storage
tank. If the temperature difference between the col-
lector and the storage tank is only 4 K, the pump is
switched off again.
The following displayappears:
The holiday symbol is displayed•
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