Lumina 17
Explanation control functions
8
Example
Setpoint Natural
is 20.5 °C (Hysteresis is 0.2).
If the measured house temperature is between 20.3 °C and 20.7 °C, the inlet positions will not be
corrected.
Inlets will be closed if the temperature is equal to or lower than 20.2 °C. Inlets will be opened if the
temperature is equal to or higher than 20.8 °C.
All controls set in the combi-table will be deactivated during natural ventilation.
Depending on the chosen house type the other inlets (
Minimum
and
Extra
) will (not) follow the natural inlets.
2.1.7
Ventilation settings
The control computer can control the fans modulating. Modulating means that a control (linear or relay) is activated
only during a part of the total cycle time. Modulating control allows minimum ventilation to be achieved using, for
example, a large fan.
Fancom differentiates between the following types of modulating control:
•
Modulating control with fixed modulation times
•
Modulating control with optimized modulation times
•
Rotating modulation
These types are explained in the next sections. This explanation is also important with linear controlled fans.
Linear controlled fans have a minimum ventilation level, for example 30%. This determines below what percentage
the ventilation will modulate, and the ventilation level during modulating. If, for example, the calculated output of the
linear part is 10%, ventilation will run for 10/30th of the cycle time at 30%, and not run for the rest of the time.
Modulating control with fixed modulation times
With this type of control enter the fixed cycle time (ON- plus OFF-time). The total cycle is as follows:
Example modulating control with fixed ON-time
Cycle time
:
10 minutes
Modulate below %
:
30%
Control value ventilation
: 15%
If the control value ventilation is lower than 30%, the control computer will use modulating ventilation. The
controllable part will be active for half of the cycle time of 10 minutes, with a ventilation level of 30%. This
means an ON-time of 5 minutes and an OFF-time of 5 minutes. The control computer always controls
based on these times.
