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47Operating manual for the auroMATIC 620 0020094404_00 Controller
Optimisation by the operator
As the operator, you can optimise the solar gain by the
following measures:
optimise the time windows for water heating,
reduce the hot water target temperature.
Optimising the time windows for hot water genera-
tion
Time windows can be programmed for the hot water
generation. Within a time window, the hot water is hea-
ted by the boiler if its temperature falls below the target
value by 5°. This post-heating function guarantees a hot
water temperature that will provide you with appropri-
ate comfort.
Outside this time window, free solar energy is used
exclusively (provided there is sufficient sunshine) to
heat the water.
i
The collector supplies most solar energy
under direct sunlight. Less sunlight falls on
the collectors when it is cloudy. As a result,
the solar gain is somewhat less.
Optimise the time windows.
You can make all the necessary settings in display
menu
3, "Hot water timer programmes"
(see Chapter 5.6).
When a circulation pump is used, hot water is always
sent from the cylinder to the individual draw-off points
during the preset timer programme in order to ensure
that the hot water is provided as quickly as possible.
The water cools down, even with a well insulated
secondary return. Consequently the drinking water
cylinder also cools down. To prevent this, the time win-
dows should be set as short as possible.
A more elegant solution is to use a button to provide
single-shot operation of the circulation pump.
After the button is pressed the circulation pump runs
for 5 minutes, pumping hot water to all the hot water
draw-off points. Thus the circulation pump can also be
used outside the time window.
Ask the heating engineer who installed your
circulation pump about this.
i
Potential loss of comfort.
If the circulation pump is not in operation, it
will take longer for the hot water to reach the
draw-off point, depending on the length of
the pipe from the tank.
>
>
Use the special one-time cylinder charging mode
The DHW cylinder can be heated once outside the time
window by using the special One-time cylinder
charging mode. Thus hot water is quickly available on
demand, even outside the time window.
Reducing the hot water target temperature
If the hot water temperature falls below the target
value by 5°C during the programmed time window, the
boiler will be switched on to heat the drinking water.
When the hot water target temperature has been rea-
ched, the boiler switches off again.
Set the hot water target value on the controller to
match your requirements (¬ Chapter 5.8).
Set the hot water target temperature as low as pos-
sible.
The lower the target temperature is, the less the boi-
ler has to reheat. More solar energy is used.
i
The lower the target temperature is, the less
often the boiler will be used for reheating.
Free solar energy can be used more often.
Optimisation by the heating engineer
Optimising the maximum temperature of the solar
cylinder
i
Have your heating engineer adjust the maxi-
mum temperature of the solar cylinder to
produce an optimum solar gain. A maximum
value for the solar cylinder temperature can
be set to ensure the highest possible returns
from the solar cylinder heating, while at the
same time ensuring that limescale protection
is active. If the set maximum temperature is
exceeded, the solar pump is switched off.
>
>
Energy saving tips 9
49


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