![background image](http://html1.mh-extra.com/html/regulus/bio-55-mix-w-pwm-1f-trs6k/bio-55-mix-w-pwm-1f-trs6k_installation-and-operation-manual_1434428046.webp)
│
46
5.1.5. Heating curve
The weather compensating curve is used to control the heat dissipation of the heating circuit
relative to the outdoor temperature. The curve can be set either as simple, or as split that
is divided by a slope change point into two parts. The simple curve can be set using one
parameter. The split one needs to be set in 3 steps.
Setting a split curve is more precise but also more complicated. First, a standard slope is
set, then the slope change point and finally the slope after the slope change point. When
setting the curve, the slope and calculated flow temperatures are shown for -12 °C outdoor
temperature.
The graph shows the influence of the selected slope of a simple curve (in the form of a
straight line) on the calculated reference flow temperature. The correct curve is determined
by defining the intersection point of the calculated max. flow temperature and min. outdoor
temperature.
The right selection of a heating curve has a principal influence on a comfortable and efficient
operation of a heating circuit. Its setting shall be done exclusively by an expert and based on
the parameters of the specific heating system and its designed temperature drop.
Example:
Max. designed flow temperature is 60 °C for
-12 °C outdoor temperature.
Then, the curve with 1.2 slope shall be selected
in the controller.
The following settings (5.1.6. to 5.1.8.) can be used to apply a parallel shift of
the heating curve for Day, Night and Comfort Temperature Boost modes.
5.1.6. Day correction
The Day correction causes a parallel shift of the heating curve during daytime operating
hours. The value represents “by how many °C” the heating circuit will be hotter/colder in the
Day mode. Positive values mean a higher temperature, negative values a lower temperature.
5.1.7. Night correction
The Night correction causes a parallel shift of the heating curve during nighttime operating
hours. The value represents “by how many °C” the heating circuit will be hotter/colder in the
Night mode. Positive values mean a higher temperature, negative values a lower temperature.
5.1.8. Comfort boost
The comfort temperature boost is a value added to / subtracted from the set day correction
following a separate time schedule (3.4. Heating Circuit Comfort). The value of temperature
increase / reduction is independent of the periods and Day/Night corrections.
In this manner it is possible to carry out e.g. quick heating up after night operating hours
through a steeper heating water temperature rise, or on the contrary, a quicker temperature
drop during a faster transition to night operating hours.
5.1.9. Minimum flow (Tmin)
The minimum flow temperature kept while the heating circuit is on. In addition to that, the
minimal flow temperature is the reference flow temperature for the frost protection function
(6.2.) when the heating circuit is off.