EB 5573-1 EN 97
Functions of the DHW circuit
7.10 Forced charging of DHW storage tank
To provide the full network performance for room heating when the time-of-use of the heat-
ing circuits begins, any storage tanks are charged one hour before the time-of-use of the
heating circuits starts. For the individual controller, this means that storage tank charging is
activated when the water temperature in the storage tank falls below the adjusted deactiva-
tion value of T = 'DHW temperature' + 'Hysteresis'.
The forced charging of the storage tank does not take place when the DHW circuit is not
used at the beginning of the time-of-use set for the heating circuit(s).
Note:
This function is not available when a storage tank thermostat is used.
7.11 Thermal disinfection of DHW storage tank
In all systems with DHW heating, a thermal disinfection is performed on a selected day of
the week or daily.
− In systems with DHW storage tank, it is heated up, taking into account the 'Charging
temperature boost' parameter (or 'Set point boost', depending on the system) to the ad-
justed 'Disinfection temperature'. Disinfection takes place within the adjusted time period
('Time').
− In systems with DHW heating in instantaneous heating system, the function remains ac-
tive taking into account the 'Boost' parameter until the circulation pipe, measured at stor-
age tank sensor 1, has reached the adjusted 'Disinfection temperature', provided disin-
fection has not been terminated prematurely at the end of the adjusted time period
('Time').
The 'Duration' determines how long the disinfection temperature must be maintained within
the adjusted time period to rate the process successful. If the 'Duration' is set to a value other
than 0, no intermediate heating operation takes place during thermal disinfection.
If the time period ('Time') is set to OFF, disinfection is controlled depending on the switching
state of the binary input (terminals 03/12) to be performed daily or on the programmed day
of the week: disinfection starts optionally with a break contact ('Active when BI' = OFF) or a
make contact ('Active when BI' = ON). It stops at the latest when the switching state of the bi-
nary input next changes.
When the 'Disinfection temperature' has not been reached before the end of the thermal dis-
infection cycle, an “Err 3“ error message is generated. This error message can also be gener-
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