18
INTER 2V4SA, rev.02
INTER 2V4SA
Merge between Stages 1 and 2
(with negative 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°
Stage 2
Bandwidth
Stage 1 Bandwidth
Stage 1 Bandwidth
Stage 2
Bandwidth
S2 Offset
S2 Offset
23
INTER 2V4SA, rev.02
INTER 2V4SA
8.3. RH Compensation on
the Min. Ventilation
Speed
The minimum speed of stage 1 can automati-
cally be adjusted as a function of relative hu-
midity. As humidity increases, the minimum
speed increases proportionally to compensate
for the change. At humidity levels at or below
the humidity set point, the minimum speed is
equal to the normal uncompensated speed.
The user specifies the percentage increase in
minimum speed for a relative humidity equal to
the humidity set point + 10%. For example, if
the minimum speed is 40% and the compensa-
tion adjustment is 30%, the minimum speed
will be adjusted to 70% of full speed when
the humidity rises 10% above the humidity
set point. In addition to adjusting the minimum
speed, the humidity compensation feature
also changes the operation of the minimum
ventilation cycle: if the controller is operating
in minimum ventilation mode when the relative
humidity exceeds the humidity set point, the
minimum ventilation fans are operated continu-
ously rather than cycled.
RH Comp. on the Min
Ventilation Speed
RH Level
(%)
10%
RH Set Point
Compensat-
ed speed
Regular
speed
Min. Vent.
speed of
stage 1
When a compensation is applied on the
minimum speed, the "Compensation" status
LED turns on.
I. Viewing the Relative Humidity
Level (%)
• Select the
RELATIVE HUMIDITY MIN/
MAX
menu. The current relative humidity
is displayed.
• Press the up-arrow adjustment button. The
maximum humidity flashes on the display,
alternating with the letters "
rH Hi
".
• Press the down-arrow adjustment but-
ton. The relative humidity is displayed once
again. Press the down-arrow adjustment
button once again. The minimum humidity
flashes on the display, alternating with the
letters "
rH Lo
".
If you let the display flash for more
than 10 seconds when the maximum
or minimum humidity is displayed,
the controller resets the minimum and
maximum humidity values currently in
memory (the display stops flashing to
indicate that the reset has been done).
II. Adjusting the Relative Humidity
Set Point
When the relative humidity level exceeds
the humidity set point, the minimum speed
of stage 1 starts increasing in linear fashion
proportionally to the humidity level to com-
pensate.
• Select the
STAGE 1 RH COMPENSATION
menu. The relative humidity set point is dis-
played alternating with the letters "
Set
".
• Use the adjustment buttons to set it to the
desired value.
