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EXPERT LA
6.5.1
Timer-based Vent Doors (Inlets)
6.5.1.1 Principle of Operation
When timer-based vent doors (inlets) are used, you
must first specify the total time that is required to
open each actuator. Then, you must associate an
opening with the start-up of each fan stage (open-
ings are defined as a percentage of the total open-
ing time). As the room temperature increases and
new stages are activated, vent doors (inlets) will
open or close accordingly.
Vent door (inlet) opening in minimum ventilation
Vent doors (inlets) are at their "Closed" position
during the Off Time portion of minimum ventilation
cycles; during the On Time portion, they open to
the position associated with stage 1.
Vent Door (Inlet)
Opening
(% of the Total
Opening Time)
Total Opening
Time
Over
opening
Last stage
opening
Stage 4
opening
Stage 3
opening
Stage 2
opening
Stage 1
opening
Minimum
Ventilation
CLOSED
52
EXPERT LA rev.00
Operating Diagram of a
Timer-based Vent Door (Inlet)
Stage 1
Stage 2
Stage 3
starts
starts
starts
Over-opening
A supplementary stage can be defined in order to
continue opening vent doors (inlets) beyond the ac-
tivation temperature of the last ventilation stage.
This over-opening stage is used to direct the airflow
more efficiently during periods of warm weather.
When all reference points of ventilation stages are
defined, the user can specify the temperature at
which vent doors (inlets) reach their over-opening
position (Start T° of the last stage + over-opening
bandwidth).
Closing Vent Doors (Inlets)
Vent doors (inlets) can either close when the con-
troller enters in natural ventilation or when the
controller reaches a user-defined tunnel ventilation
stage. Refer to the Installation Setup chapter to
close vent doors in natural ventilation (section 4.5)
or refer to section 6.4.4 to choose at what tunnel
stage vent doors (inlets) must close.
Over-opening
bandwidth
Stage 4
Last stage
starts
starts
ROOM
TEMP.
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