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EXPERT WW rev.12
EXPERT WW
6.5.2. Potentiometer-based Vent
Doors (Inlets)
6.5.2.1. Principle of Operation
When potentiometer-based vent doors (inlets)
are used, you must associate a vent door
(inlet) opening with the start-up of each fan
stage. As the room temperature increases and
new stages are activated, vent doors (inlets)
will open or close accordingly.
Inlet opening in minimum ventilation:
The
vent door (inlet) is at its
“Closed”
position dur-
ing the
“Off Time”
portion of minimum ventila-
tion cycles; it opens to the position associated
with stage 1 during the
“On Time”
.
Over-opening:
A supplementary stage can
be programmed in order to continue opening
the vent door (inlet) beyond the activation
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 the vent
door (inlet) reaches its over-opening position
(Start T° of the last stage + over-opening
bandwidth).
Closing Vent Doors (Inlets):
Vent doors
(inlets) can either close when the control-
ler 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
6.4.3 to choose at what tunnel stage vent
doors (inlets) must close.
Security function:
If the potentiometer is
defective, the controller will operate in se-
curity mode: if the room temperature is 2°F
(1.1°C) above the set point, the vent door
(inlet) opens according to the following cycle:
8 seconds ON, 60 seconds OFF. If the room
temperature is 2°F (1.1°C) below the set
point, the vent door (inlet) closes according
to the same cycle.
6.5.2.2. Vent Door Settings
1. Select:
Main menu
Vent/Inlet*
Vent door / Inlet 1 is already displayed.
* This menu is accessible if at least one vent door
(inlet) output enabled in the Installation Setup (sec-
tion 4.5). A password may also be required to access
this menu (section 4.2).
Make sure vent door (inlet) output 1 uses
a potentiometer. Refer to section 4.5 to
set the vent door (inlet) mode. (Note
that the second vent door (inlet) output
cannot use a potentiometer).
2. Set the following parameters:
(Refer to the previous section to get further informa-
tion on these parameters)
Position — This is the current position of the selected
vent door (inlet). This value cannot be modified.
Test mode —
This is the room temperature
that is used in test mode. This value can only
be modified when the test mode is enabled
(see section 4.11).
Closed —
This is the position of the vent
door (inlet) during the
“Off Time”
portion of
minimum ventilation cycles. Set this position
to the desired value.
Stage #x —
Assign a vent door (inlet) opening
(in %) with each fan stage in use.
Over-Opening Settings:
Opening —
Assign a vent door (inlet) position
to the over-opening stage.
Bandwidth —
Set the temperature range
over which the vent door (inlet) gradu-
ally opens from the position associated
with the last fan stage towards the over-
opening position).
Operating Diagram of a
Potentiometer-based Vent Door (Inlet)
Min Vent.
Vent door/ Inlet
Opening
(%)
Stage 1
starts
Stage 2
starts
Stage 3
starts
Stage 4
starts
Room T°
Last Stage
starts
Over-opening
bandwidth
Closed
Min.vent.
opening
Stage 2
opening
Stage 1
opening
Stage 3
opening
Stage 4
opening
Last Stage
opening
Over-opening
Vent Door/
Inlet 2
Auto Reset
Calib.
Vent Door /Inlet 1 Settings
Position
0 %
Test Mode
72.3 °F
Openings
Closed
0 %
Stage 1
10 %
Stage 2
20 %
Stage 3
30 %
Stage 4
40 %
Stage 5
50 %
Stage 6
60 %
Stage 7
70 %
Stage 8
80 %
Over Opening settings
Opening
100 %
Bandwidth
5.0 °F
