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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 18 Function block: Solar d.h.w. 15.03.2011
18.3.7 Evaporation temperature of heat conducting medium
Operating line 205 is used to set the evaporation temperature of the heat conduct-
ing medium. If there is a risk of evaporation of the heat conducting medium (due to
high collector temperatures), the collector pump is deactivated to prevent it from
overheating. This is a pump protection function.
ON
OFF
TVerd
15 K
TVerd
Evaporation temperature of heat conducting medium
TKol
Collector temperature
ON/OFF
Collector pump
T
Temperature
t
Time
The collector pump is deactivated if the collector temperature exceeds the eva-
poration temperature:
TKol > TVerd
The collector pump is activated again when the collector temperature drops 15 K
below the evaporation temperature:
TKol < TVerd – 15 K
Setting --- deactivates the pump protection function.
Evaporation protection of the heat conducting medium (pump off) has priority over
overtemperature protection which would activate the pump.
18.3.8 Maximum limitation of charging temperature
Operating line 206 is used to set the maximum limitation for the charging tempera-
ture. When the maximum charging temperature in the storage tank is reached, the
collector pump is deactivated.
ON
OFF
1 K
TSp
Storage tank temperature
T
Temperature
TSpMax
Maximum lim value of charging temperature
t
Time
ON/OFF
Collector pump
Charging is aborted if the storage tank temperature exceeds the maximum limit
value:
TSp > TSpMax
Charging is released again when the storage tank temperature drops 1 K below
the maximum limit value:
TSp < TSpMax – 1 K
Overtemperature protection for the collector can again activate the collector pump
until the storage tank temperature reaches its maximum limit value.
Note
87


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