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Siemens Heating and D.h.w. Controller RVL481 CE1P2541en
Building Technologies 26 Function block "D.h.w. solar charging" 20.05.2008
26.2.3 Minimum runtime
When the collector pump is switched on, it remains on for min. runtime tMin = 20 s. This
minimum runtime is enabled for all functions activating the collector pump.
2541D07
t
tMin
fSolar
ON
OFF
fSolar Solar function
ON/OFF Collector pump
tMin Minimum runtime
Collector pump switch-off is delayed by the minimum runtime after the frost protection
limit is reached to rinse the flow pipe between collector to storage tank with hot water.
2541D08
tMin
ON
OFF
f
Frost
fFROST Frost protection function solar
ON/OFF Collector pump
tMin Minimum runtime
26.2.4 Collector frost protection temperature
Operating line 203 is used to set the frost protection temperature for the collector.
The collector pump is operated if there is a risk of frost at the collector to prevent the
heat carrier from freezing.
T
ON
OFF
t
TKol
2541D09
1 K
TKolFrost
TKol Collector temperature
TKolFrost Collector frost protection temperature
ON/OFF Collector pump
T Temperature
t Time
• The collector pump switches on if the collector temperature drops below the frost pro-
tection temperature: TKol < TKolFrost
• The collector pump is switched off if the collector pump rises above the frost protection
temperature by 1 K: TKol > TKolFrost + 1K.
• The frost protection function is stopped if d.h.w. storage tank temperature drops below
8 °C.
Setting --- switches off the collector frost protection function.
Special case: Frost pro-
tection
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