3 Mode of operation – Functional description
27
C
ONTROL
OF
THE
SOLAR
HEATING
SYSTEM
Depending on the hydraulic system, three different types of control
for the solar heating system are possible:
•
The solar heating system heats the hot water tank
•
The solar heating system heats the combination accumulator
•
The solar heating system heats both the hot water tank and accu-
mulator
The
Solar heating
selection parameter enables you to choose
between the following:
•
None
•
Domestic hot water tank
•
combination accumulator
•
hot water tank / accumulator and
•
Hot water tank / accumulator / heat exchanger
.
S
OLAR
HEATING
-
NONE
This setting can be selected if a solar heating system is to be installed
at a later point. No commands are sent to the solar heating pump
and sensors are ignored.
S
OLAR
HEATING
-
HOT
WATER
TANK
The solar heating pump is driven at a controlled speed, taking into
account the temperature difference
Collector temp, DHW
bottom
.
The temperature of the solar collector must exceed the
DHW
bottom
temperature by the solar hysteresis value for solar heating
to start. The heating of the hot water by the solar heating system can
be limited by setting a maximum temperature.
S
OLAR
HEATING
-
COMBINATION
ACCUMULATOR
The solar heating pump is driven at a controlled speed, taking into
account the temperature difference
Collector temp, Acc.
bottom
.
The temperature of the solar collector must exceed the
Acc.
bottom
temperature by the amount of the solar hysteresis for solar
heating to start. The heating of the hot water by the solar heating
system can be limited by setting a maximum temperature.
S
OLAR
HEATING
-
HOT
WATER
TANK
/
ACCUMULATOR
If the
DHW bottom
temperature exceeds the maximum, or if the
temperature of the solar collector is not sufficient to heat the hot
water tank, the solar accumulator pump will likewise switch on
(speed-controlled). The accumulator will now be heated and the
sun's energy can be used for heating. If the maximum temperature of
the hot water tank has not yet been reached, the solar accumulator
pump will switch off to establish whether the energy from the sun
would be sufficient to heat up the hot water tank. If this proves to be
the case, the solar pump will switch on again. If not, the solar accu-
mulator pump will switch on again for the preset period.
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