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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 18 Function block: Solar d.h.w. 15.03.2011
The frost protection function is aborted when the d.h.w. storage tank tempera-
ture drops below 8 °C
Setting --- deactivates the frost protection function for the collector
18.3.5 Overtemperature protection for the collector
Operating line 204 is used to set the temperature that protects the collector against
overheating.
If there is a risk of collector overtemperature, storage tank charging is continued
beyond maximum limitation of the charging temperature (setting on operating line
206) until maximum limitation of the storage tank temperature is reached (setting
on operating line 207), aimed at reducing the amount of surplus heat.
When maximum limitation of the storage tank temperature is reached, overtem-
perature protection for the collector is no longer possible, and the collector pump is
deactivated.
ON
OFF
1 K
5 K
TSpSi
Maximum limitation of storage tank temperature
TSp
Storage tank temperature
TKolUe
Overtemperature protection for collector
TSpMax
Maximum limitation of charging temperature
TKol
Collector temperature
ON/OFF
Collector pump
T
Temperature
t
Time
If the collector temperature exceeds the overtemperature protection level and
maximum limitation of the storage tank temperature is not yet reached, the col-
lector pump is activated: TKol > TKolUe and TSp < TSpSi.
If the collector temperature drops 5 K below the overtemperature protection
level, the collector pump is deactivated: TKol < TKolUe – 5 K
If the storage tank temperature rises to the maximum limit value, the collector
pump is deactivated:
TSp > TSpSi
If the storage tank temperature drops 1 K below maximum limitation of the d.h.w.
storage tank temperature, the collector pump is activated again:
TSp < TSpSi – 1 K
If 2 storage tank sensors are used, the sensor acquiring the highest temperature is
considered.
Setting --- deactivates overtemperature protection for the collector.
85


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