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EXPERT LA
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.
Static
Pressure
HI PRESSURE
SET POINT *
LO PRESSURE
SET POINT *
Opening of Static-Pressure-Based
Vent Doors (Inlets)
Vent doors (inlets)
start closing after
the Wind Effect Delay
has elapsed.
EFFECT
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.
Vent doors (inlets)
Vent doors
start opening
(inlets) stop
after the Wind
closing
Effect Delay
has elapsed.
WIND
DELAY
Vent doors
(inlets) stop
opening
WIND
EFFECT
DELAY
Time
EXPERT LA rev.00
55
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