47
MAIN MENU settings
6 720 617 763 (2008/09)
6.5 Solar settings
Main menu: Solar
Use this menu if you want to limit the cylinder
temperature or optimise the specified domestic
hot water temperature and specified flow tem-
peratures based on the available solar energy in
your geographical region.
Limiting cylinder temperature(s)
In order to store as much solar energy as possi-
ble, a high cylinder temperature is required.
Limiting the cylinder temperature prevents over-
heating of the domestic hot water. The tempera-
ture setting is transmitted by the ISM module
during commissioning.
•
T2: Max. solar cylinder temperature
: Set cyl-
inder temperature > 60 °C in systems with
domestic hot water cylinders only if hot water
outlet temperature is limited by a thermo-
static mixing valve.
When using solar buffer cylinders, e.g. in solar
preheat systems (solar system 3 and 4),
T2:
Max. solar cylinder temperature
can be set
higher.
For menu structure and adjustment ranges
Æ
page 35.
Solar optimisation
In order to use as much solar energy as possible,
the FW 100 heating controller can estimate the
expected solar yield during the course of the day
and take this into account in controlling the
boiler. The boiler will then not be required to pro-
duce as much heat and will use less gas.
For more information for installers
Æ
•
Optimizing influence DHW
: Maximum reduc-
tion of specified domestic hot water tempera-
ture through solar input.
Example:
–
Specified domestic hot water temperature
= 60 °C
–
Optimizing influence DHW
= 15 K
–
Specified domestic hot water temperature
for the boiler = 60 °C – 15 K
–
Provided there is sufficient solar output
available, the maximum reduction is set
and the boiler heats the domestic hot
water to 45 °C, with the remaining 15 K
being provided by the solar contribution.
•
CH circuit optimizing influence
: Influence of
solar output on heat output that feeds into the
heating circuit. At a high value, the preheat
temperature of the heating curve is reduced at
a correspondingly greater rate (further infor-
mation for heating engineers
Æ
from page 56) 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.
–
CH circuit optimizing influence
if the heat-
ing circuit heats rooms that have large
areas of south-facing windows.
–
CH circuit optimizing influence
if the heat-
ing circuit heats rooms that have small
areas of north-facing windows.
Warning:
Risk of scalding if the cyl-
inder temperature is higher than
60 °C.
B
If the cylinder temperature limit
is set to > 60 °C, fit a thermo-
static mixing valve in the hot wa-
ter supply pipe.
B
Set the thermostatic mixing
valve to 60 °C max.
