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EXPERT PN110
6.3.
Air Inlets
6.3.1. Principle of Operation
The controller can control the opening of 1 air
inlet. The opening of this device can either be
defi ned by a potentiometer or with a timer.
Set the operating mode of the air inlet in the
Installation Setup (sec. 4.5).
When using the inlet output, the user has
to associate an inlet opening with the start-up
of each fan stage. As the room temperature
increases and new stages are activated, the
air inlet will open or close accordingly.
Inlet opening in minimum ventilation:
The inlet is at its "Closed" position during the
"Off Time" portion of a minimum ventilation
cycle and opens to its minimum ventilation
position during the "On Time".
Over-opening of the air inlet: A supplemen-
tary stage can be defi ned in order to continue
opening the air inlet beyond the activation
temperature of the last ventilation stage.
This over-opening stage is used to direct the
airfl ow more effi ciently during periods of
warm weather.
The air inlet can either reach its over-opening
position right away when the room tempera-
ture reaches a certain point or it can reach its
over-opening position gradually as the room
temperature departs from the start tempera-
ture of the last fan stage. In either case, the
inlet reaches its full over-opening position at:
On T° of the last fan stage + Over-opening
bandwidth.
Refer to the Installation setup menu to enable
the Over-Opening function for the air inlets
(see section 4.5).
Security function (for potentiometer-based
inlets): If the potentiometer is defective, the
controller will operate in security mode:
the room temperature is 2°F (1.1°C) above
the set point, the inlet opens according to the
following cycle: 5 seconds ON, 120 seconds
OFF. If the room temperature is 2°F (1.1°C)
below the set point, the inlet closes according
to the same cycle.
20
EXPERT PN110 rev.23
Inlet
Opening
Over-opening
(optional)
Last Stage
opening
Stage 3
opening
Stage 2 max
opening
Stage 2
opening
Stage1
opening
Stage 1 min
opening
Min.vent.
opening
Min. Vent.
Closed
6.3.2. Settings
Inlet openings are defi ned as a percent-
age of their total opening time.
1. Select:
» INLET
1. Stage Opening*
»
* This menu is accessible if the inlet is enabled
(section 4.5).
Inlet
Status :
Auto
Position
0 %
Calibration?
No
Minimum
Set
if
Maximum
Set
Test Mode
44.0 °F
Hysteresis
2 %
MinFan Spd
45 %
Closed
0 %
Min Vent.
5 %
Stg.1 Min
5 %
Stage 2
20 %
...
Stage 8
0 %
Overopening settings
Opening
Off
Bandwidth
5.0 °F
Total open
2:00
Under Run T.
2 sec
Air Inlet
Stg 1
Stg 2
Stage 3
Bdw
Bdw
Off T°
Stage 1
Stage 2
ON T°
ON T°
2. Set the following parameters:
Position — This is the current position of the
air inlet. This value cannot be modifi ed.
Test mode — This is the room temperature
that is used in test mode. This value can only
be modifi ed in the "Test Mode" menu (see
section 4.17.7).
Hysteresis — When the actuator isn't moving,
a minimum opening or closing command is
necessary for the actuator to start moving.
This value is called the "hysteresis" and it can
be adjusted from 1 to 15 seconds (timer-
based inlet) or from from 2 to 10% (potenti-
ometer-based inlets). The hysteresis prevents
the actuator from moving constantly. Set it
to the desired value.
Min Fan Speed — Set the fan speed over
which the inlet can start opening.
Closed — This is the position of the air inlet
during the "Off Time" portion of minimum
ventilation cycles. Set this position to the
desired value.
Min Vent — This is the position of the air inlet
during the "On Time" portion of a minimum
ventilation cycle.
Or
Gradual or instant
over-opening
(optional)
Over-
opening
bandwidth
Stage 3
Last Stage
(optional)
ON T°
starts
Room
T°
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