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50 | Adjusting the MAIN MENU
6.5 Solar settings
Main menu: Solar
Use this menu if you want to limit the cylinder
temperature or optimise the set DHW and flow
temperatures based on the available solar energy
in your geographical region.
Limiting cylinder temperature
In order to store as much solar energy as
possible, a high cylinder temperature is required.
Limiting the cylinder temperature prevents
overheating of the domestic hot water. The
temperature setting is transmitted by the ISM
module during commissioning.
T2: Max. solar cylinder temperature: Cylinder
temperature > 60 °C in DHW cylinders only if
outlet temperature is limited by thermostatic
DHW mixer.
For menu structure and setting ranges
Æ page 36.
Solar optimisation
In order to use as much solar energy as possible,
the FR 110 heating controller can estimate the
expected solar yield over the course of a day and
take it into account when controlling the DHW.
The heating appliance will then not be required
to produce as much heat and will use less gas.
For more information for heating contractors
Æ chapter 8.5.3 on page 62
Optimizing influence DHW: Maximum
reduction of set DHW temperature by effect of
solar thermal system.
Example:
Set DHW temperature = 60 °C
Optimizing influence DHW =15K
Set DHW temperature for 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 contribution.
For menu structure and setting ranges
Æ page 36.
WARNING: Risk of scalding!
If the cylinder temperature is
higher than 60 °C.
B If the cylinder temperature limit
is set to > 60 °C, install a
thermostatic DHW mixer or the
DHW comfort assembly (WWKG,
accessories Æ Fig. 4 on
page 13) in the DHW line.
B Set the DHW mixer unit to 60 °C
max.
Optimizing influence DHW does not
start until a calibration phase of at
least 30 days has been completed
after commissioning of the solar
thermal system. In that period, the
FR 110 heating controller “learns”
what level of solar yield is possible.
50


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