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lower area of the storage tank (T2) reaches the set
maximum storage tank temperature (factory setting
of 60 °C), charging is stopped. A temperature of 3 K
below the maximum storage tank temperature must
first be reached before charging can be resumed.
The following displays appear:
The pump symbol does not move
The sun symbol is displayed
The "max" indication flashes in the storage tank
symbol
7.3 Maximum coll
ector temperature
During periods of high solar irradiance, the tempera-
ture (T1) of the heat transfer fluid can exceed 130 °C.
The heat transfer fluid evaporates. In this case, the
pump is stopped for protection purposes until the
temp
erature drops below 127 °C.
The following displays appear:
The pump symbol does not move
The sun symbol is displayed
The vapour symbol flashes
7.4 Tube coll
ector function
Due to its construction, the collector temperature (T1)
can only be inaccurately recorded with vacuum tube
collectors (in some cases there are no immersion sen-
sors; or the sensor is outside the collector pipe). In
these cases, the solar circuit must be briefly activated
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