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Adjusting the MAIN MENU | 39
6.6 Solar settings
Main menu: Solar
For menu structure and setting ranges
Æ page 30.
Use this menu if you want to limit the cylinder
temperature or optimise the set DHW
temperature and the set flow temperature based
on the available solar energy in your geographical
region.
Limiting cylinder temperature
Storing as much solar energy as possible requires
a high cylinder temperature.
Limiting the cylinder temperature prevents
overheating of the DHW. The temperature setting
is transmitted by the ISM module during
commissioning.
T2: Max. solar cylinder temperature: Cylinder
temperature > 60 °C only in systems if the DHW
outlet temperature is limited by thermostatic
DHW mixer.
Solar optimisation
The utilisation of as much solar energy as
possible makes it appropriate to reduce the set
temperatures called for by the heating appliance.
The controller enables this reduction
automatically subject to the available solar
energy with Optimizing influence DHW and with
CH circuit optimizing influence.
For more information for contractors, see
Æ chapter 8.5.3 on page 53.
Optimizing influence DHW: Maximum
reduction of set DHW temperature by effect of
solar thermal system.
Example:
Set DHW temperature = 60 °C
Optimizing influence DHW = 15 K
Set DHW temperature for the heating
appliance = 60 °C – 15 K
Provided there is sufficient solar output
available, the maximum reduction is set
and the heating appliance heats the DHW
to 45 °C, with the remaining 15 K being
provided by the solar yield.
CH circuit optimizing influence: Influence of
solar output on heat input fed into the heating
circuit. At a high value, the heating curve flow
temperature is reduced at a correspondingly
greater rate (further information for
contractors Æ chapter 8.3 from page 47) to
enable greater passive solar energy input
through the building's windows. At the same
time this reduces a temperature overshoot in
the building and increases the comfort level.
Increase CH circuit optimizing influence if
the heating system heats rooms that have
large areas of south-facing windows.
Do not increase CH circuit optimizing
influence if the heating system heats
rooms that have small areas of north-facing
windows.
WARNING: Risk of scalding!If the
cylinder temperature is higher than
60 °C.
B If the cylinder temperature limit
is set to > 60 °C, fit the
thermostatic DHW mixerTWM
20 (accessory) in the DHW line.
B Set TWM 20 to max. 60 °C.
Optimizing influence DHW and CH
circuit optimizing influence do not
start until a calibration phase of at
least 30 days has been completed
after commissioning of the solar
thermal system.
39


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