Cumberland Expert-32P, User Manual

Page: 43 / 76

43
Expert-32P rev.11
TUNNEL VENTILATION
The controller can control an endwall curtains for tunnel ventilation. The tunnel
curtain is either controlled using a timer that is associated with the stages'
activation or by the static pressure level in the room. Refer to the Controller
Setup chapter to select the curtain's operation mode (Time/Static Pressure).
A minimum age is defined to prevent tunnel ventilation from being used
when the animals are too young. The user defines the age above which the
tunnel ventilation mode can start. The tunnel curtain will never open until
this age is reached. In addition, it is possible to define an outside tempera-
ture below which the tunnel ventilation mode is never be enabled. This
feature prevents to open the curtain when it is too cold outside. This op-
tion and can only be used if an outside temperature probe is connected to
the controller.
CURTAIN: MOVING TIMES BASED ON THE STAGES'
ACTIVATION
PRINCIPLE OF OPERATION
The user determines when to start tunnel ventilation by defining the start-
ing fan stage and the stage at which the curtain is fully opened. When the
first tunnel stage is reached, the curtains are opened according to the
opening time defined for the first stage. When half of the opening time
has elapsed, the stage's fans are activated. The activation of every con-
secutive fan stage causes the curtain to open further, in accordance with
the stages’ opening times. The same sequence is executed in reverse
order when the temperature decreases. The following diagram sums up
the operation of the first two tunnel stages.
FAN STAGE A
ROOM T°
OFF
TUNNEL
FAN STAGES
FANS OF
STAGE A
TURN OFF
THE CURTAIN STARTS
OPENING THEN THE
FANS OF STAGE A
TURN ON
FANS OF STAGE B
TURN OFF
---------------------
THE CURTAIN CLOSES
DURING STAGE B’S
OPENING TIME
FANS OF STAGE B
TURN ON
---------------------
THE CURTAIN OPENS
DURING STAGE B’S
OPENING TIME
FAN STAGE B