Note!
The set point in the heat exchanger circuit which is valid at the end of the charging cycle will
be used again at the beginning of the next cycle.
If times-of-times have been set for DHW heating, the
Set point DHW temperature
adjusted at
the rotary switch is applied during these times-of-use. Outside the times-of-use, the
Sustained
DHW temperature
is used. This does not apply when a storage tank thermostat is used.
Time-controlled switchover of storage tank sensors
By configuring a second storage tank sensor SF2 over the function block CO4 -> F19 -1, it is
possible to determine that the storage tank sensor SF1 is used for day mode in the DHW cir
-
cuit and that the storage tank sensor SF2 is used for night mode. As a result, different stor
-
age tank volumes can be kept at a constant temperature according to a time schedule, and
also to different temperatures if the
DHW set point
and
Sustained DHW temperature
differ
from one another.
Stop storage tank charging
The controller stops charging the storage tank when the water temperature measured at sen-
sor SF2 has reached the temperature T =
DHW temperature
+
hysteresis
. To do so, the
exchanger charging pump is switched off first.
When there is no heating operation or when the flow temperature demand in the system is
lower, the corresponding valve is closed. The storage tank charging pump is switched off af-
ter t =
lag of storage tank charging pump
x
valve transit time
.
Functions
WE Configuration
Storage tank sensor SF1 1 CO4 -> F01 - 1
Storage tank sensor SF2 1 CO4 -> F02 - 1
Flow sensor VF4 0 CO4 -> F05
Time-controlled switchover of storage
sensors
0 CO4 -> F19
Parameter
WE Rotary switch / Range of values
DHW temperature set point or charging tem
-
perature set point with CO4 -> F01 - 0
55 °C Bottom /Min. to max. DHW
temperature
Parameters
WE Parameter level / Range of values
Min. DHW temperature* 40 °C PA4 / 5 to 90 °C
Max. DHW temperature* 60 °C PA4 / 5 to 90 °C
EB 5575 EN 67
Functions of the DHW circuit
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