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Protective functions
To prevent the accumulation of limescale, the circulation pump can continue to rinse
the heat exchanger after a tapping for at least 5 seconds or for longest 30 seconds or
till the VFS sensor drops below Tset.
5.2. - Limescale Protection
If the seizing protection is activated, the controller switches the output in question and
the connected consumer on every day at 12:00 (setting “daily”) or weekly on Sundays
at 12:00 (setting “weekly”) for 5 seconds in order to prevent the pump and/or the valve
from sticking after an extended stationary period.
5.3. - Discharge Protection
If the temperature in the primary circuit is not always guaranteed to su󰀩ce, this function is used.
With this function activated:
When no storage sensor is connected:
If the setpoint temperature is not reached after 60 seconds, the currently measured tempera-
ture -3°C is used as new setpoint temperature. Once the pump in the primary circuit stops, the
setpoint temperature is raised to the set Tset again.
When the storage sensor is connected
If the temperature at the storage sensor is smaller than Tset -5°C, the target temperature is
lowered to the currently measured storage temperature -5°C.
In both cases “Circ Tmin” is lowered to the new setpoint temperature - Circ. hysteresis - 5°C,
where “Circ Tmin is not lower than 0° C and not higher than the set Circ Tmin.
5.4. - Seizing protection
24


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