11.
AIR INLET & CHIM-
NEY DAMPERS
11.1. Principle of Operation
The controller can control the opening of 1 air
inlet and of a 0-10V chimney damper.
When using the inlet or chimney output,
the user must associate an actuator position
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 (step 0) during
the
“Time Off”
portion of a minimum ventilation
cycle and opens to its minimum ventilation
position (step 1) during the
“Time On”.
Over-opening of the air inlet:
A supplemen-
tary stage can be defined 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
airflow more efficiently 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 User Setup Menu to
enable the Over-Opening function.
Low Temperature Override —
The
low tem-
perature override function allows bypassing
the inlet's normal operation when the room
temperature is too cold. When this override
function is enabled, the inlet directly goes
to a user-defined position when the room
temperature falls below a user-defined tem-
perature limit (Low Override Temperature).
Refer to the User Setup Menu to activate this
function and to set the low temperature limit.
Opening of the Air Inlets &
Chimney Dampers
Actuator Position
Room T°
Step 1
Hi
Step 1
Step 0
Step 2
Step 2
Hi
Step 3
Last Stage
Opening
Over-
Opening
(opt.)
Stage 2 start T°
Set Point
S3 Start T°
Last stage
Stop T°
S3 Stop T°
Last stage Start T°
# degrees
to full
speed
of stg1
# degrees
to full
speed
of stg2
over-open.
bandw.
Min.V.
or
Gradual or
instant
over-opening
(opt.)
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EXPERT 2V3SA, rev.10
EXPERT 2V3SA
6.4.3. Nbr of Degrees to 100% of
Stage 3
1. From the main menu, select:
STAGES 3-.
2. Use the navigation keys to select this
parameter:
Degrees to 100%
2.0°F
(This parameter is accessible if the merge be-
tween stages 2 and 3 is enabled in the User Setup
Menu.)
3. Set the number of degrees required to
reach 100% of Stage 3. This value rep-
resents range of temperature over which
stage 2 fans increase or decrease in speed
proportionally to the temperature once
stage 3 fans are activated (see previous
graph). This parameter ranges from 0.5°F
to 20.0°F (0.3°C to 11.1°C).
6.5.
De-icing Stage 2 Fans
Stage 2 fans can automatically be de-iced
in cold weather conditions (or in any condi-
tions if the controller does not use an outside
temperature sensor).
When a de-icing cycle starts, Stage 1 fans are
stopped then stage 2 fans start running at full
speed for 2 seconds. Stage 2 fans then run at
their minimum speed during the de-icing time.
Once the de-icing time has elapsed, stage 2
fans stop running and the regular ventilation
process is resumed.
De-icing
Status
ON
OFF
Time
De-icing
time
Cycle
Time
De-icing Timer
The de-icing cycles are only activated
when the outside temperature falls
below a user-defined temperature
unless the controller has no outside
temperature sensor. In that case, the
de-icing cycles are always active.
Settings
1. From the main menu, select:
STAGE 2.
2. Use the navigation keys to select these
parameters:
De-icing out T°
41.0°F
*
On: 20sec
Cycle: 720min
**
3. Set the following parameters:
(The parameter adjustment process is explained
in section 3.2 on page 8).
De-icing out T° —
Set the outside tempera-
ture below which the de-icing cycles must
start. *
This parameter is only accessible if the
de-icing function and the outside temperature
sensor are enabled in the User Setup Menu.
On —
Set the Time On portion of the
de-icing cycles. It ranges from 0 to 900
seconds. *
*This parameter is only accessible
if the de-icing function is enabled in the User
Setup Menu.)
Cycle —
Set the amount of time that sepa-
rates two consecutive de-icing cycles. The
cycle time ranges from 1 to 720 minutes
and must be greater than the Time On.
*
*This parameter is only accessible if the de-ic-
ing function is enabled in the User Setup Menu.)
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EXPERT 2V3SA