Energy-Efficient Operation; Setting A Heating Curve On The Basis Of The External Temperature - Dimplex WPM EconPlus Installation And Start-Up Instructions For Technicians

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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 flow 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 actually desired room temperatures.
Regulation via return flow temperature
Regulating a heat pump heating system via the return flow
temperature offers the following advantages:

7.1 Setting a heating curve on the basis of the external temperature

The heating curve must be adjusted - separately for heating
circuit 1 and 2 / 3 - to suit the respective building and location
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 1/2/3 – Control via – External
temperature". The desired heating curve can be set in the
following menu item "Heating curve – End point".
1) The maximum required return flow temperature at an
external temperature of -20 °C is entered in the menu
"Settings - Heating curve end point". The aim is to attain an
average constant room temperature even if the external
temperatures vary.
Fig. 7.1: Setting options for the heating curve
EN-24
1) Long runtimes for the heat pump, with all of the circulated
heating volume heated according to need.
2) Measuring disturbance variables in the heating system.
3) A reduction in the temperature spread at a constant return
flow temperature results in lower flow temperatures and thus
in more efficient operation.
NOTE
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 flow 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 1/2/3 – 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).