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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 18 Function block: Solar d.h.w. 15.03.2011
18.3.3 Minimum running time
When the collector pump is activated, it keeps running for a minimum time of tMin
= 20 seconds. This minimum on time applies to all functions that activate the col-
lector pump.
tMin
fSolar
ON
OFF
fSolar
Solar function
ON/OFF
Collector pump
tMin
Minimum on time
To ensure that the flow pipe from the collector to the storage tank is flushed with
hot water, deactivation of the collector pump after reaching the frost protection limit
at the collector sensor is delayed by the minimum running time.
tMin
ON
OFF
f
Frost
fFROST
Frost protection function solar
ON/OFF
Collector pump
tMin
Minimum running time
18.3.4 Fost protection temperature for the collector
Operating line 203 is used to set the frost protection temperature for the collector.
If there is risk of frost at the collector, the collector pump is activated to prevent the
heat conducting medium from freezing.
ON
OFF
1 K
TKolFrost
TKol
Collector temperature
TKolFrost
Frost protection temperature for collector
ON/OFF
Collector pump
T
Temperature
t
Time
The collector pump is activated when the collector temperature drops below the
frost protection temperature: TKol < TKolFrost
The collector pump is deactivated when the collector temperature rises 1 K abo-
ve the frost protection temperature: TKol > TKolFrost + 1 K
Frost protection as
a special case
84


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