Lumina 17
Explanation control functions
9
Modulating control with optimised modulation times
With optimal modulating control the control computer aims for an optimal ON-time and an optimal OFF-time entered
by the installer. The diagram below shows that the switch off moment and cycle time can vary:
Example - Optimum modulating control (1)
Optimum ON-time
:
2 minutes
Maximum 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
control computer assumes an optimum ON-time of 2 minutes and a ventilation level of 30%. This means
that the optimum ON-time of 2 minutes must be half of the total cycle time. The control computer
calculates a cycle time of 2 x 2 = 4 minutes (2 minutes on and 2 minutes off). In this example the OFF-time
will also be 2 minutes.
Example - Optimum modulating control (2)
Modulate below %
:
30%
Control value ventilation
: 3%
The control computer assumes an optimum ON-time of 2 minutes. This means that the optimum ON-time
of 2 minutes must be a tenth (=3/30) of the total cycle time. The control computer calculates a cycle time
of 10 x 2 minutes = 20 minutes (2 minutes on and 18 minutes off). However, this is longer than the
maximum cycle time of 10 minutes.
The control computer will calculate new ON- and OFF-times based on the maximum cycle time as
follows: 1/10 of 10 minutes means an ON-time of 1 minute. The rest of the time the control remains
switched off.
Rotating modulation
The fans which must activate at a certain ventilation position have been set in the relay or combi-table. However,
this means that the same fans will always be active. Using rotating the control computer will activate the number of
assigned fans, but in a different sequence each time. This creates an optimal spread of air in the house. In addition,
all fans are evenly used.
Rotating the sequence is impossible if all combi-relays (assigned for rotation) are activated.
2.2
Heating
The control computer has various heating controls that can be assigned independently.
Temperature zones in the house
A heater (blower) often only warms part of the house. It is better to divide the house into zones, and link certain
temperature sensors to the heater for this zone.
Separate setpoint heating
Usually one setpoint house temperature is used for ventilation and heating. The heating can also be given a
separate setpoint, the so-called ‘extra temperature’. The extra temperature must be entered in the curve.
This may be necessary if floor heating is controlled based on temperature. In this case, the sensor measures a
different temperature to the actual house temperature.
