27
CONTROL 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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