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6.1.3
M inim um Ventilation Curve
The controller has a curve function which allows
increasing the “On Time” portion of minimum ven-
tilation cycles with time.
A curve is composed of 10 steps. Each step speci-
fies a day number and an “On Time” for that day
(the day number refers to the animal age). Once
the curve is activated, the controller changes the
“On Time” of minimum ventilation cycles in a lin-
ear fashion between consecutive steps of the curve.
When the last step is reached, the controller keeps
using the “On Time” associated to that day.
Minimum Ventilation
On Time Curve
On Time
of Min Vent.
Cycles (sec.)
DAYS
D1
D10
D15
D20
D25
D30
D35
D40
120
105
90
75
60
45
30
Notes
Certain restrictions apply to reduce the
risk of errors:
- The highest possible day number is 450.
- Decreasing day numbers is not allowed.
- All ten steps must be specified. If you don't
need ten different steps, repeat the last “On
Time” for each unnecessary step.
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6.5.2
Static-Pressure-Based Vent
Doors (Inlets)
6.5.2.1 Principle of Operation
Static-pressure-based vent doors (inlets) open or
close as a function of the static pressure level in the
room. They open when the static pressure level ex-
ceeds the high pressure set point or close when the
static pressure level is lower than the low pressure
set point. The graph below illustrates this process.
Refer to chapter 5 to set the static pressure set
points.
Wind Effect Delay
When the pressure level exceeds the high or low
static pressure set point, vent doors (inlets) wait for
the end of the
“Wind Effect Delay”
before moving.
They will only move if the high or low pressure con-
dition is still valid after the delay has elapsed. This
way, vent doors (inlets) do not move if a wind draft
causes fleeting changes in the pressure level.
LO PRESSURE
SET POINT *
Static
Pressure
HI PRESSURE
SET POINT *
T
H
E
A
C
T
U
A
T
O
R
O
P
E
N
S
T
H
E
A
C
T
U
A
T
O
R
D
O
E
S
N
O
T
M
O
V
E
WIND
EFFECT
DELAY
WIND
EFFECT
DELAY
Vent doors (inlets)
start closing after
the Wind Effect Delay
has elapsed.
Vent doors
(inlets) stop
closing
Vent doors
(inlets) stop
opening
Vent doors (inlets)
start opening
after the Wind
Effect Delay
has elapsed.
Time
T
H
E
A
C
T
U
A
T
O
R
C
L
O
S
E
S
Pre-Opening Delay
In minimum ventilation, vent doors (inlets) open dur-
ing the “Pre-opening delay” before the controller
starts the fans.
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.
Opening of Static-Pressure-Based
Vent Doors (Inlets)
