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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 18 Function block: Solar d.h.w. 15.03.2011
18.3.9 Maximum limitation of storage tank temperature
Operating line 207 is used to set the maximum limitation of the storage tank tem-
perature.
The storage tank is never charged to a level above the set maximum temperature
(refer to chapter 18.3.5 "Overtemperature protection for the collector").
Maximum limi
tation of the storage tank temperature is not a safety function!
18.3.10 Collector start function
The controller is supplied with the collector start function deactivated.
Since the temperature at the collector (especially in the case of vacuum pipes)
cannot be reliably acquired when the pump is not running, the pump can be acti-
vated based on an adjustable gradient [min/K].
Operating line 208 is used to set the gradient for the collector start function.
The gradient corresponds to the temperature increase per minute when the collec-
tor is off:
Gradient = 1 [min/K]: Corresponding to a temperature increase of 1 [K/min]
Gradient = 20 [min/K]: Corresponding to a temperature increase of 1/20 [K/min]
If, within 1 minute, the temperature acquired by the collector sensor rises more
than the set gradient, the pump is activated (minimum running time 20 seconds). If
the required collector charging temperature is reached within the period of time the
pump runs, solar d.h.w. charging is started and the pump remains activated.
If the collector temperature does not reach the required level, or drops again, the
pump is again deactivated. The pump remains on for a maximum of 1 minute plus
the minimum running time (20 seconds), if the solar charging function does not
provide control of the pump
.
T
ON
OFF
t
2541D13
1 K
TKol
t < Grad
TKol Collector temperature
Grad Gradient
ON/OFF Collector pump
T Temperature
t Time
Setting --- deactivates the collector start function.
Caution
88


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