12.11 Important parameters
Heat production - calculating
The indoor temperature is adjusted by changing the heat pump’s heat curve, which is the control computer’s tool for calculating what the
supply temperature should be for water that is sent out in the heating system. The heat curve calculates the supply temperature depend-
ing on the outdoor temperature. The lower the outdoor temperature, the higher the supply temperature. In other words, the supply tem-
perature of the water fed to the heating system will increase exponentially as the outside air temperature falls.
The heat curve will be adjusted in connection with installation. It must be adapted later on, however, to obtain a pleasant indoor tempera-
ture in any weather conditions. A correctly set heat curve reduces maintenance and saves energy.
CURVE
The control computer shows the value for CURVE by means of a graph in the display. You can set the heat curve by adjusting the CURVE value.
The CURVE value indicates the supply temperature of the water to be sent out to the heating system at an outdoor temperature of 0°C.
Graph showing the set value 40 for CURVE.Figure 83:
At outdoor temperatures colder than 0°C, supply water hotter than 40°C is sent out to the heating system and at outdoor temperatures
greater than 0°C, supply water cooler than 40°C is sent out.
Increasing or reducing the CURVE changes the slope of the curveFigure 84:
If you increase the CURVE value, the heat curve will become steeper and when you reduce it, it will become flatter.
The most energy efficient and cost effective setting is achieved by changing the CURVE value to adjust the temperature in the house to an
even and constant temperature. For a temporary increase or reduction, adjust the ROOM value instead.
Value for CURVE is 40...
Outdoor temperature
Supply temperature
...at zero degrees
Maximum supply tem-
perature
Supply temperature
Outdoor temperature
Maximum supply tem-
perature
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