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EXPERT WW rev.12
EXPERT WW
6. VENTILATION & COOLING
6.1. Minimum Ventilation
6.1.1. Minimum Ventilation Cycles
Definition:
Minimum ventilation cycles are
activated when the room temperature is
lower than the start temperature of the first
fan stage. Running the fans even though
ventilation is not required for reducing the
room temperature is useful to reduce humidity
levels and supply oxygen to the room. It also
prevents the fans from freezing in winter.
Minimum Ventilation Timer:
The minimum
ventilation timer is composed of an
“On Time”
and of a
“Cycle Time”
. The fans run during
the
“On Time”
and then stop until the end of
the
“Cycle Time”
. This timer is common to all
programs of the controller.
Min.Vent
Fan Status
ON
OFF
Time
ON Time
Cycle Time
Minimum
Ventilation Timer
Minimum Ventilation Fans:
Minimum ventilation is ensured by a user-
defined selection of On/Off fans. Refer to
section 4.8.2 to select these fans.
Automatic Adjustment of the Minimum Ven-
tilation Level:
The controller can automatically increase
minimum ventilation rates over time by in-
creasing the
“On Time”
portion of minimum
ventilation cycles (refer to section 6.1.3).
6.1.2. Minimum Vent. Settings
1. Select:
Main menu
Min Vent.
Minimum Ventilation
Min Vent. Status
On
Minimum Ventilation Timer
On time
15 sec
Cycle time
120 sec
2. Set the following parameters:
Minimum ventilation status —
Select
“On”
to use minimum ventilation cycles or select
“Off”
to disable them.
On Time —
Set the
“On Time”
of the minimum
ventilation timer. Note that if the minimum
ventilation curve is enabled, the controller
automatically defines this value as a function
of the animal age (see section 6.1.3).*
This
parameter can only be modified while the curve is
inactive (sec. 6.1.3).
Cycle —
Set the
“Cycle Time”
of the minimum
ventilation timer. Note that the
“Cycle Time”
must be longer than the
“On Time”
.
6.1.3. Minimum Ventilation Curve
The controller can automatically adjust the
“On Time”
portion of the minimum ventilation
timer with time. The minimum ventilation
curve is composed of 10 steps and each
step associates an
“On Time”
with an animal
age. Once the curve is enabled, the controller
changes
“On Time”
portion of the minimum
ventilation cycles every hour in a linear fash-
ion between consecutive steps of the curve.
When it reaches the last step, the controller
keeps using the last
“On Time”
associated
with that day.
3:05
2:48
2:31
2:14
1:57
1:40
1:23
1:06
0:49
0:33
0:15
Min. Ventilation
On Time Curve
1 2 3 4 5 6 7 8 10 11 12
DAYS
ON TIME
Notes:
Certain restrictions apply to reduce
the risk of errors:
a) The highest possible day number is 450.
b) Decreasing day numbers is not allowed.
c) All ten steps must be specified. If you don’t
need 10 different steps, repeat the last
“On
Time”
for each unnecessary step.
1. Select:
Main menu
Min. Vent.
Vent Curve*
* A password may be required to access this menu.
Cur. Day
0 day
On Time
15 sec
day
1
15 sec
day
10
15 sec
day
15
15 sec
day
20
15 sec
day
25
15 sec
day
30
15 sec
day
35
15 sec
day
40
15 sec
day
45
15 sec
day
50
15 sec
Status
Off
Minimum Vent Curve Program 1
Use to navigate
The following parameters can only be
modified while the curve is off.
2. Set the following parameters:
(Refer to the previous section to get further informa-
tion on these parameters)
Current day —
This is the current age of the
animals. This value may be changed to move
backward or forward on the curve. A change
in the current day also changes the animal
age in the “Age & mortality” menu.
On Time —
The current minimum ventilation
fan
“On Time”
is displayed.
Day numbers —
Set the day at which each
step starts. The day number refers to the
animal age and it is adjustable from -5 to 450
days. Negative values are used to prepare the
house before letting the animals enter. *
This
parameter can only be modified while the curve is
disabled.
On Time —
Assign a minimum ventilation
“On
Time”
to each step of the curve. *
This parameter
can only be modified while the curve is disabled.
Status —
Select
“On”
to activate the curve.
Once the curve is on, the controller automati-
cally adjusts the
“On Time”
of minimum venti-
lation cycles between consecutive points of
the curve; for this reason, curve steps cannot
be modified while the curve is running.
