98
EQJW146F002 EN
Functions of the DHW circuit
steps of 1 °C. When the set point in the heat exchanger charging circuit reaches the 'Max.
charging temperature', the set point is no longer increased. An “Err 4“ error message is gen-
erated.
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 night set point for 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 2, it is possible to determine by setting the func-
tion block CO4 > F19 - 1 that the storage tank sensor 1 is used for day mode in the DHW
circuit and storage tank sensor 2 for night mode. As a result, different storage tank volumes
can be kept at a constant temperature according to a time schedule and also at different tem-
peratures if the 'DHW temperature set points' for day and night differ from one another.
Stop storage tank charging
The controller stops charging the storage tank when the water temperature measured at stor-
age tank sensor 2 has reached the temperature T = 'DHW temperature' + 'Hysteresis'. To do
so, the heat exchanger charging pump is immediately switched off. 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 after the time has elapsed t =
P06 x valve transit time.
Functions
WE
Configuration
Storage tank sensor 1
CO4 > F01 - 1
Storage tank sensor 2
CO4 > F02 - 1
Flow sensor
0
CO4 > F05
Switchover
0
CO4 > F19
Parameters
WE
Switch position: value range
Day set point for DHW temperature or
charging temperature when CO4 > F01 -
0
60.0 °C
: Min. to max. adjustable DHW set point
Note
