Siemens RVL481 - Minimum Charging Temperature

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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
T
ON
OFF
TSp
t
TKol
2541D14
SD
OFF
SD
ON
TLmin
TKol Collector temperature
ON/OFF Collector pump
SD
ON
Temperature differential ON
SD
OFF
Temperature differential OFF
TSp Storage tank temperature
TLmin Minimum charging temperature
T Temperature
t Time
• The storage tank is charged if the collector temperature exceeds the current storage
temperature by the switch-on differential:
TKol > TSp + SD
ON
• Storage tank charging is stopped if the collector temperature drops below the tempera-
ture differential:
TKol < TSp + SD
OFF
26.2.2 Minimum charging temperature
The collector pump is commissioned only if the collector has a minimum temperature of
30 °C and the required temperature differential is reached.
T
ON
OFF
TLmin 30 °C
SD
ON
- SD
OFF
t
TKol
2541D06
TKol Collector temperature
ON/OFF Collector pump
SD
ON
Temperature differential ON
SD
OFF
Temperature differential OFF
TLmin Minimum charging temperature
T Temperature
t Time
• Charging is stopped (even if the switch-on differential is reached) if the collector tem-
perature is below the charging temperature:
TKol < TLmin
• Charging takes place if the collector temperature exceeds the minimum charging tem-
perature (and if the required switch-on differential is reached) by the switch-on differen-
tial (SD
ON
– SD
OFF
):
TKol > TLmin + (SD
ON
– SD
OFF
)