Shapes of Heating Curves
You can control the shape of the heating curve by adjusting the "Minimum Exponent" and "Maximum Exponent" parameters. The best way to understand their effect is to visualize example curves with different values for these parameters.
When both the "Minimum Exponent" and "Maximum Exponent" parameters are set to values close to unity, the resulting relationship becomes nearly linear.
Setting both the "Minimum Exponent" and "Maximum Exponent" parameters to values less than 1 will result in a concave curve. The lower both values are, the more pronounced the concavity becomes.
With the default values for "Minimum Exponent" and "Maximum Exponent", the resulting curve is slightly convex. This means the temperature rises more steeply at the beginning and more gradually toward the end.
Increasing the difference between the "Minimum Exponent" and "Maximum Exponent" parameters, along with raising their overall values, enhances the convexity of the curve. The change in the curve's shape can be observed in the following graphs:
Based on your experience with manual heating system adjustments, you need to select 5-6 reference points. For each point, note the outdoor temperature and the corresponding heating system temperature you would typically set. The goal is to adjust the curve number and shape so that the calculated curve aligns with these reference points. This method serves as an excellent starting configuration.