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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
26.2.10 Collector start function gradient
The pump must periodically be switched on, as the temperature at the collector (primar-
ily vacuum pipes) cannot be measured reliably when the pump is off.
Operating line 208 allows for setting the collector start gradient function.
The pump is switched on if the collector temperature increases by less than the set
gradient. The pump remains on if the required temperature increase at the collector is
reached within one minute.
The pump is again switched off if the collector temperature does not reach the required
level or continues to drop.
The gradient corresponds to the time period required to increase the collector's station-
ary temperature by 1 °C.
T
ON
OFF
t
2541D13
1 K
TKol
t < Grad
TKol Collector temperature
Grad Gradient
ON/OFF Collector pump
T Temperature
t Time
Setting --- switches off the collector start function.
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