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.
6.10 Thermal disinfection of the DHW storage tank
In all systems with DHW heating, the DHW storage tank is thermally disinfected on a se
-
lected
Day of the week
or every day.
4
In systems with DHW storage tank, it is heated up, taking into account the
Charging tem
-
perature boost
parameter (or
Set point boost
, depending on the system) to the adjusted
Disinfection temperature
. Disinfection begins at the adjusted
Start time
and, at the latest,
ends at the specified
Stop time
.
4
In systems with DHW heating in instantaneous heating system, the function remains active
taking into account the
Set point boost
parameter until the circulation pipe, measured at
SF1, has reached the adjusted
Disinfection temperature,
provided disinfection has not
been terminated because the
Stop time
has been reached.
If the
Start time
and
Stop time
are set to the identical time, the process is controlled accord-
ing to the programmed time schedule depending on the switching state of a binary input (ter-
minal 03/12, only possible without SF2/RF2). A break contact (bE = 0) or optionally also a
make contact (bE = 1) of the binary input starts the thermal disinfection. It stops at the latest
when the switching state of the binary input next changes.
When the
Disinfection temperature
has not been reached before the end of the thermal disin
-
fection cycle, “Err 3“ alarm is generated. The alarm is automatically reset when the
Disinfec
-
tion temperature
is properly reached during the following thermal disinfection cycle.
Thermal disinfection for preventing legionella infection causes
4
excessively high return flow temperatures during the disinfection cycle (return flow tempe
-
rature limitation suspended),
4
excessively high DHW temperatures after thermal disinfection has been concluded,
4
lime scale (possibly), which can have a negative effect on heat exchanger performance.
72 EB 5575 EN
Appendix
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