Lumina 17
Explanation control functions
7
Transition low ventilation → natural ventilation
At a rising temperature and when the
combi start/stop LOW Natural
is reached, the control computer switches to
natural ventilation. To prevent toggling the system must have been out of the natural phase for a certain time before
system returns to the natural phase again.
The control computer opens the curtain, then switches the fans off. The control computer controls how far the
curtains open based on the minimum natural inlet settings.
Transition natural ventilation → strong ventilation
If the temperature continues to rise the control computer switches over to mechanical ventilation when the air inlet is
fully opened (curtain opened to maximum) and the temperature rises above
combi start/stop HIGH Natural
. The
inlets for natural ventilation (curtains) are closed, if required. The inlets for mechanical ventilation are opened based
on the values in the combi-table. The required fans are activated.
Transition strong ventilation → natural ventilation
With falling temperatures the control computer switches over to natural ventilation when the temperature falls below
the position
combi start/stop HIGH Natural
. The curtains are opened to maximum position. Then the fans are
switched off. To prevent toggling the system must have been out of the natural phase for a certain time before
system returns to the natural phase again.
Transition natural ventilation → low ventilation
With falling temperatures the control computer switches over to low ventilation when the curtains are open minimum
and the temperature falls below
combi start/stop LOW Natural
. The inlets for natural ventilation (curtains) are
closed. The inlets for mechanical ventilation are opened and the required fans are activated according to the values
in the combi-table.
Minimum wait time
Enter a minimum wait time to prevent continuous switching between two ventilation types (yo-yo effect). If a
ventilation transition is required, the control computer will wait this time before making a new transition.
Controlling the air inlets during natural ventilation
The air inlets open or close when the temperature differs from
Setpoint Natural
.
If the temperature is higher than
SN + Hysteresis
, the inlets will open. If the temperature is lower than
SN -
Hysteresis
, the air inlets will close.
The extent of inlet control depends on the difference between measured temperature and
Setpoint Natural
. The
greater the difference, the longer the inlets will be opened or closed. Closing until the inlet position is equal to the
setting
Minimum % (Natural)
. Opening until the inlet position is equal to the setting
Maximum % (Natural)
.
Control speed
Natural
:
•
Slow = 120 sec
•
Moderate = 60 sec
•
Fast = 30 sec
