Samson TROVIS 5431, Mounting And Operating Instructions

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5.5.3 Intermediate heating for drinking water charging (CO2 F10)
This function can be selected for systems 2 and
3. During the heating of drinking water, the
heating circuit is normally deactivated, pro-
vided that you did not configure the controller
for parallel pump operation. To prevent the
heating circuit from cooling down entirely dur-
ing prolonged storage tank charging pro-
cesses, you can set function block CO2 F10-1.
This interrupts the storage tank charging pro-
cess after 20 minutes and initiates the heating
operation for 10 minutes.
For underfloor heating circuits, we recommend
that intermediate heating be deactivated with
CO2 F10-0, since these do not cool down as
quickly as radiator circuits and the storage
tank charging process is completed faster with-
out intermediate heating phases.
5.5.4 Switchover of control for drinking water heating in the storage tank
charging system (CO2 F03)
For this function, you require the flow sensor
FS2. It can only be selected for system 3.
Setting CO2 F03-1 releases the switchover of
control from flow sensor FS1 to FS2. This
allows the flow temperature to be controlled
directly at the heat exchanger for the drink-
ing water heating. One minute after the stor-
age charging pump has been activated, the
control loop’s reference variable is switched
over from flow sensor FS1 to flow sensor
FS2. At the flow sensor FS1, the controller
monitors the ‘Heat exchanger limitation tem-
perature during charging’ (PA2, default
120 °C). When this value is reached, the
switchover of control ends and the value is
used as set point for control. If the tempera-
ture at FS2 now exceeds the charging set
point by more than 5 K, the control is
switched over again.
5.5.5 Build-up of charging temperature via the return flow sensor with
deactivated heating circuit (CO2 F08)
This function requires one return flow sensor.
It can only be selected for system 2. Normal-
ly, the charging temperature for the storage
tank is built up via the heating circuit. If the
heating circuit is deactivated and the function
block CO2 F08-1 is set, the storage tank
charging pump is only activated for the char-
ging of the storage tank when the temperatu-
res at the return flow sensor RfS and at the
storage tank sensor STS1 are identical. This
prevents cold water from entering the tank
when the charging process starts. The return
flow temperature limitation is set to the flow
temperature set point for this time.
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EB 5431 EN
Functional descriptions