Samson TROVIS 5573 Mounting And Operating Instructions page 60

Functions of the DHW circuit
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 circuit
and that the storage tank sensor SF2 is used 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 differ-
ent temperatures if the DHW set point and Sustained DHW temperature differ from one an-
other.
Stop storage tank charging
The controller stops charging the storage tank when the water temperature measured at sen-
sor SF1 has reached the temperature T = DHW temperature + hysteresis . When there is no heat-
ing 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 t = lag time of storage tank charging
pump x valve transit time .
With the default settings, the temperature in the storage tank is increased by 5 °C to reach
60 °C when the storage tank temperature falls below 55 °C. The charging temperature is calcu-
lated from the DHW temperature (55 °C) plus the Charging temperature boost (10 °C), which
equals 65 °C. When the storage tank has been charged, the heating valve is closed and the
charging pump continues operation for the time t (lag). Outside the times-of-use, the storage
tank is only charged when the temperature falls below 40 °C ( Sustained DHW temperature ). In
this case, the tank is charged with a charging temperature of 50 °C until 45 °C is reached in the
tank.
Functions
Storage tank sensor SF1
Storage tank sensor SF2
SLP ON depending on return flow temperature
Time-controlled switchover of storage tank
sensors
Parameters
DHW temperature set point or charging
temperature set point with CO4 -> F01 - 0
Sustained DHW temperature
Parameters
Min. DHW temperature*
60
EB 5573 EN
WE Configuration
1 CO4 -> F01 - 1
CO4 -> F02 (-1 when CO4 -> F19 - 1)
0 CO4 -> F15
0 CO4 -> F19 (-1 only when CO4 -> F02 - 1)
WE Switch position / Range of values
55.0 °C / Min. to max. DHW temperature
40.0 °C / Min. to max. DHW temperature
WE Parameter level / Range of values
40.0 °C PA4 / 5.0 to 90.0 °C