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7
7 Energy-efficient Operation
If heating operation is carried out on the basis of the external
temperature, the heating controller calculates a return set
temperature from the set heating characteristic curve and the
current external temperature.
The heating curve should be set to the maximum calculated
return temperature of the heating system. By using the buttons
Hotter (⇑) and Colder (⇓), the heating curve can be shifted
upwards or downwards in parallel, according to customer
requirements, to attain the desired room temperatures.
7.1 Setting a heating curve on the basis of the external temperature
The heating curve must be adjusted (separately for heating
circuits 1 and 2) to suit the respective building and local
conditions so that the desired room temperature is also attained
when the external temperatures vary. If the external temperature
rises, the return set temperature is lowered, thus ensuring
energy-efficient operation of the heating system.
Make selections in the menu "Settings – Heating circuit 1/2 –
Control by – External temperature". The desired heating curve
can be set in the following menu item "Heating curve – End
point".
1)
In the menu "Settings - Heating curve end point", enter the
maximum required return temperature at an external
temperature of -20 °C. The aim is to attain an average
constant
room
temperature
temperatures vary.
Fig. 7.1:
Setting options for the heating curve
E-12
even
if
the
external
Regulation via return temperature
Regulating a heat pump heating system via the return
temperature offers the following advantages:
1)
Long runtimes for the heat pump, with all of the circulated
heating volume heated according to need.
2)
Measuring of disturbance variables in the heating system
(e.g. passive solar gain).
3)
A reduction in the temperature spread at a constant return
temperature results in lower flow temperatures and thus in
more efficient operation.
4)
The heating curve should be set as high as necessary but as
low as possible!
2)
All heating characteristic curves intersect at an external
temperature of +20 °C and a return temperature of +20 °C.
This means that at this operating point no more heat output
is required. The indicator bar (Hotter ⇑ and Colder buttons⇓)
can be used to shift the operating point between 5 °C and
30 °C along the axis marked by a slope. This shifts the entire
heating curve upwards or downwards in parallel, by a
consistent amount of 1 K per indicator bar unit. The user can
make this setting according to his/her individual temperature
requirements.
3)
Each heating curve is limited in an upward direction by the
value set in "Settings – Heating circuit 1/2 – Heating curve
maximum". In the downward direction, each heating curve is
limited by the value 15 °C (air HP) or 18 °C (brine or water
HP).
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