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PRESSURE CONTROL
The under pressure can
automatically be adjusted to the
current outside temperature:
•
Outside temperature is low
=> higher under pressure.
•
Outside temperature is high
=> lower under pressure (cold
air is heavier than warm air)
Start outside temperature Absolute
Start outside temperature Relative
Absolute
The setting from where the pressure is compensated is a fixed temperature setting.
Relative
The setting from which pressure is compensated increases/decreases “run along” with the house temperature.
“From outside temperature” = temperature difference relative to the house temperature.
U
n
d
er
p
re
ss
u
re
[
P
a]
Outside temperature [°C]
15
30
25
10
20
Max.
30
Min.
5
20
Fixed setting (absolute)
U
n
d
er
p
res
su
re
[P
a]
Outside temperature [°C]
15
30
25
10
20
Max.
30
Min.
5
20
House temperature (25,0°C)
ΔT
-5.0°C
Setting follows the house temperature
(relative)
The compensated pressure is limited by the set
minimum
and
maximum pressure
.
RH
The ventilation / flap position and set house temperature can be controlled based on relative humidity.
Absolute RH = the water vapour content per cubic metre.
Cold air can contain less water vapour than hot air. If the air temperature is 10°C, the air can hold approx. 9.8g
of water vapour per m³ and at a temperature of 20°C this can be approx. 18.6g/m³.
Example
If the relative humidity is 70%
Air of a temperature of 10 °C can contain approx. 6.9 g/m³ (0.7*9.8)
Air of a temperature of 20 °C can contain approx. 13.0 g/m³ (0.7*18.6).
RH compensation without RH outside air
RH compensation only influences ventilation. This means that the ventilation effort will be greater if the value
measured is higher than the value set for “RH compensation”.
The corrected ventilation is limited
by the pre-set maximum (Max.).
Compensation = ((current RH – RH
compensation) * factor.
Compensation ventilation
Factor 0.0 = RH compensation does not affect the ventilation.
Factor 9.9 = RH compensation has a maximum effect on the ventilation.