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INTER 2V4SA, rev.02
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III. Adjusting the Compensation
Speed
This is the percentage of increase in minimum
speed for a relative humidity equal to the
humidity set point + 10%. The value ranges
from 0 to 100%.
• Select the
STAGE 1 RH COMPENSATION
menu.
• Press the Other Functions button. The
minimum speed compensation is displayed,
alternating with the letters "
SPEEd
".
• Use the adjustment buttons to set it to the
desired value.
IV. Activating/Deactivating Humid-
ity Compensation
• Select the
STAGE 1 RH COMPENSATION
menu.
• Press the Other Functions button twice. The
current on/off state of humidity compensa-
tion flashes on the display.
• Use the adjustment buttons to enable or
disable this function.
8.4. Minimum Ventilation
Speed Ramp
The controller can automatically adjust the
minimum ventilation speed of stage 1 fans
with time. The minimum ventilation curve is
composed of 10 steps and each step associ-
ates a speed with a day number. Once the
curve is enabled, the controller changes the
minimum ventilation speed of stage 1 fans
every hour in a linear fashion between con-
secutive steps of the curve. When it reaches
the last step, the controller keeps using the
last minimum ventilation speed associated
with that day.
Speed 10
Speed 9
Speed 8
Speed 7
Speed 6
Speed 5
Speed 4
Speed 3
Speed 2
Speed 1
Min. Ventilation
Ramp
1 2 3 4 5 6 7 8 10 11 12
DAYS
Min.Vent
Speed
(stage 1)
Notes:
Certain restrictions apply to reduce
the risk of errors:
i) Decreasing minimum speeds are not al-
lowed.
ii) All ten steps must be specified. If you don’t
need 10 different steps, repeat the last mini-
mum speed for each unnecessary step.
iii) The minimum speed ramp must be deac-
tivated before specifying the steps on the
ramp (see below).
iv) The min. speed variation cannot exceed
10% per day.
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7.1.1. Merging Fan Stages 1 & 2
The transition from Stage 1 to Stage 2 can
create jumps in the volume of displaced air.
To prevent this, Stage 1 fans automatically go
to their Override Minimum Speed when stage
2 starts. As the room temperature increases,
fan Stages 1 & 2 both increase in speed to
create a smooth progression and both reach
their maximum speed at the end of Stage 2
Bandwidth. Refer to 7.2 on page 20 to set the
Override Minimum Speed for stage 1.
Merge between Stages 1 and 2
(with positive Stage 2 Offset)
100%
Stage1 Override
Min speed
Stage 1
Min speed
100%
Variable
Stage 2 speed
Variable
Stage 1 speed
Off
Stage 2
Min speed
Off
Room T°
Room T°
Set Point
Stage 1 Bandwidth
Stage 2 Bandwidth
Stage 2 Bandwidth
S2 Offset
S2 Offset
Stage 1 Bandwidth
Set Point
