Explanation control functions
Extra fans can only be switched on or off via a relay. They are usually used when the controllable fans are
running at maximum or in combination with controllable fans to achieve a gradual increase in ventilation.
Figure 5: Example of an extra fan switched on and off from the control computer by a relay
The control computer determines the use of air inlets, extra inlets and fans based on the combi-table. Below is an
example of a combi-table. This may differ to your own combi-table, for example, because you use a different
number of extra fans. The combi-table shows the required values at successive positions (M1 thru M10 in the
example). The relay fans will do 20.000 m3 each and the controllable part is 25.000 m3.
The combi-table also contains the ventilation capacity. This is used to determine the ventilation position if control
is based on ventilation capacity per hour per animal (m3/h/animal).
The required pressure in the combi-table is used to control the inlet based on the under pressure in the house.
See Optimisation based on pressure page 10.