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EXPERT LA
6.3
Natural Ventilation Curtains
The controller can control 2 natural ventilation cur-
tains. To operate these curtains, the controller re-
fers to the average temperature reading of the
probes that are assigned to each curtain (see sec.
4.7.3).
6.3.1
Principle of Operation
The controller enters in natural ventilation when the
average temperature of the probes that are associ-
at ed t o a cur t ai n r eaches t he
perature of the curtain. At that moment, the cur-
tain opens during its Initial Opening Time.
When the natural ventilation mode is on, the natural
ventilation curtain moves in timer mode: it opens
according to its opening cycle (Open Time & Off
Time) when the average temperature rises above
its opening temperature; likewise, it closes accord-
ing to its closing cycle (Close Time & Off Time) when
the temperature falls below its closing temperature.
Relation between Fan Stages &
Natural Ventilation Curtains
Curtain
Status
The curtain
timer mode
ON
OFF
Set Point
Natural
Ventilation
Status
ON
OFF
Set Point
44
EXPERT LA rev.00
Initial Opening Tem-
The curtain
closes in
opens in
timer mode
Close at
Open at
5°F
Initial
Stop
Opening
natural
temperature
Natural ventilation is disabled when the average
temperature decreases of 5°F (2.8°C) below the
curtain's closing temperature or when tunnel ven-
tilation starts (see graph below).
Transition from tunnel to natural ventilation
When the temperature decreases below the start
temperature of the first tunnel stage, the control-
ler opens the curtain continuously during the Con-
tinuous Opening Delay. When this delay has
elapsed, it starts controlling the curtain using natu-
ral ventilation settings.
Transition from natural to tunnel ventilation
When the natural ventilation curtain is opened and
the room temperature reaches the start tempera-
ture of the first tunnel stage, the controller waits
for the Tunnel Close Delay then fully closes the
natural ventilation curtain.
Average T°
of the curtain's
probes
Stage
Activation
First
tunnel stage
starts
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