40
EXPERT LA rev.00
EXPERT LA
6.2
Fan Stages
6.2.1
Principle of Operation
The controller has 12 fan stages which operate in
a sequence to increase the level of ventilation as
the room temperature increases. Each stage can
activate on/off outputs and a combination of timer
relays for cooling purposes. A fan stage is acti-
vated when the room temperature reaches its start
temperature and is disabled when the room tem-
perature decreases to its stop temperature.
Start temperatures of fan stages are defined with
respect to the set point and with respect to each
other. This means that when one of these values is
adjusted, all the consecutive values are adjusted
by the same amount. For example, if the set point
is increased by 1°F, the start temperature of all
fan stages will be increased by the same amount.
Timer-based relays in fan stages
Fan stages can activate relays that operate fol-
lowing a timer (On and Off Times). This is useful to
activate misting units in timer mode while a spe-
cific fan stage is active. Refer to section 4.8 to
enable timer-based relays.
Operating Diagram
of Fan Stages
VENTILATION
LEVEL
ROOM T°
STAGE X
STAGE Y
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EXPERT LA rev.00
EXPERT LA
6.5.1.2 Timer-based Vent Door (Inlet) Settings
Select:
Main menu
Vent/Inlet*
Vent door / Inlet 1 is already displayed; press
Vent door / Inlet 2 to display parameter set-
tings of the second inlet.
*
Accessible if at least one vent door (inlet) output enabled in
the Installation Setup (section 4.5). A password may also
be required to access this menu (section 4.2).
Make sure you have selected a timer-
based vent door (inlet). Refer to sec-
tion 4.5 to set vent door (inlet) func-
tions.
Vent door (inlet) openings are defined
as a percentage of their total opening
time.
Position
This is the current position of the selected
vent door (inlet). This value cannot be modi-
fied.
Test mode
This is the room temperature that is used in
test mode. This value can only be modified
in the “Test Mode” menu (see section 4.11).
Closed
This is the position of the vent door (inlet)
during the Off Time portion of minimum ven-
tilation cycles. Set this position to the de-
sired value.
Stage #x
Assign a vent door (inlet) opening to each
fan stage in use (in %).
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) gradually opens
from the position associated with the
last fan stage towards the over-
opening position (see previous graphic).
Total opening time
Enter the
exact time
that is required to reach
the actuator's maximum limit switch. The
controller will limit the opening of the vent
door (inlet) according to this parameter
value.
* Accessible if at least one timer-based vent door
(inlet) is enabled in the Installation Setup (sec. 4.5).
[This parameter is common to all programs].
Main menu
Vent/Inlet
Vent Door/
Inlet 2
Auto Reset
Vent Door /Inlet 1 Settings
Use to navigate
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
Total Opening Time
2:00 m:s
