17 Description of function
2022/07 99E13331xx-mub-en - V08 41
17.5 Disinfection
Danger of scalding due to hot water!
If the function is activated, there is the risk of scalding during the defined time window at all
withdrawal points!
Inform user
Make sure to avoid scalding at the installation
Bigger DHW systems are thermally disinfected in order
to kill dangerous germs (such as legionella bacteria) in
the system. For this, the domestic hot water module
can provide higher hot water temperatures.
If the function is activated, the disinfection automatically starts at the selected disinfection day at
the selected disinfection time.
It is also possible to start the disinfection manually.
When the disinfection starts, the circulation pump is actuated with 100 % speed at the same
time and remains switched on for the defined disinfection duration (only when circulation was
activated). If the circulation is deactivated, the nominal temperature is overwritten by the
disinfection temperature during a withdrawal. During the disinfection, the primary pump is
controlled in a way that the defined disinfection temperature is maintained at the hot water
outlet.
The disinfection is logged as "successful" when, during the duration of the disinfection, the
temperature at the cold water sensor (with circulation) or at the hot water sensor (without
circulation) exceeds the temperature (disinfection temperature – 5 K) for the defined time
Disinfection OK after
. A successful disinfection can be automatically stopped before time by
selecting
Disinfection → Stop before time
. At
Disinfection → Disinfection history
can be seen
when a disinfection was carried out and if it was successful or not.
After the end of the disinfection duration, the circulation pump is switched off and the primary
pump controls again to the defined hot water nominal temperature.
By deactivating the function, the disinfection is aborted.
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