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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-use have been programmed for DHW heating, the
DHW temperature set point
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 at 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 tempe hysteresis. To do so, the heat
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 time 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 temper-
ature 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 / 20 to 90 °C
Max. DHW temperature*
60 °C
PA4 / 20 to 90 °C
EB 5576 EN
65
Functions of the DHW circuit