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EXPERT LA
6.4
Tunnel Doors
The controller can control the opening of 2 tunnel
doors as a function of the static pressure level or
as a function of the average temperature in the
room. Refer to section 4.5 of this manual to choose
the proper operating mode.
6.4.1
Pressure-based Tunnel Doors
Beginning of tunnel ventilation
The activation of tunnel ventilation is linked with
the activation of a user-defined fan stage: when
the start temperature of that fan stage is reached,
the controller starts controlling tunnel doors accord-
ing to the static pressure level. It opens the doors
when the pressure level exceeds the high pressure
set point and closes them when the pressure level
is lower than the low pressure set point. Refer to
the chapter 5 to set the static pressure set points.
Minimum outside temperature
A minimum outside temperature can be specified
to avoid entering in tunnel ventilation when it is
too cold outside. This feature is optional and can
only be used if an outside temperature probe is
enabled (sec. 4.7.1).
Static
Pressure
The tunnel door
starts closing after
the Wind Effect
Delay has elapsed.
HI PRESSURE
SET POINT *
LO PRESSURE
SET POINT *
48
EXPERT LA rev.00
Minimum age
A minimum age can be specified to avoid entering
in tunnel ventilation when the animals are too
young. This feature is optional and can only be used
if age-based functions are enabled in the Installa-
tion Setup (section 4.5).
Pre-opening
The pre-opening delay is used to slightly open tun-
nel doors before the activation of tunnel fans. The
pre-opening is performed at the start-up of tunnel
ventilation (i.e., when the fan stage which activates
tunnel ventilation starts).
Wind effect delay
When the pressure level exceeds the high or low
static pressure set point, tunnel doors wait for the
end of the "Wind Effect Delay" before moving. Tun-
nel doors will only move if the high or low pressure
condition is still valid after the delay has elapsed.
This way, tunnel doors do not move if a wind draft
causes fleeting changes in the pressure level.
Closing vent doors (inlets) in tunnel ventilation
If vent doors (inlets) remain opened in natural ven-
tilation, you must define the tunnel stage at which
they must close.
Opening of Tunnel Doors
as a Function of Static Pressure
The tunnel
door stops
closing
WIND
EFFECT
DELAY
The tunnel door
The tunnel
starts opening
door stops
after the Wind
opening
Effect Delay
has elapsed.
WIND
EFFECT
DELAY
Time
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