VALLOX 75/95
4
VENTILATION SYSTEM
WARNING
Shutting down ventilation in the
dwelling also prevents the inflow of
new fresh outdoor air to the dwelling
and the outflow of dirty air and
impurities emanating from human
bodies, structures and the soil, such as
carbon dioxide, humidity, odours,
formaldehyde, dust and radon.
These impurities quickly spoil indoor
air and cause health problems,
whereas excessive humidity may spoil
structures and cause mould and fungus
growth. Therefore, the building
regulations require ventilation to be
continually in operation and the level
of ventilation to be adjusted as needed
by the user.
!
As the name says, a dwelling-specific ventilation system (blocks of flats, terraced houses,
small detached houses) is meant for only one dwelling.
The system includes two sides. The extract air side takes dirty and humid air out, while the
supply air side brings a corresponding amount of outdoor air in.
Ventilation in the rooms is continual and can be regulated as needed. Outdoor air is mainly
brought to the bedrooms, sitting room, fireplace room, dining room and sauna. From these
rooms supply air can flow freely, for instance through door vents, to the bathroom, sauna,
toilet, walk-in closet, kitchen and other rooms with air vents. If cold outside air can be let in
to the sauna, only use it when it is needed as combustion air for a wood-heated sauna oven.
The resident may regulate the power of ventilation (air circulation) as needed.
Filtering
Outdoor air is filtered before taking it in to the dwelling. A coarse filter first removes the
biggest litter particles, thereby preventing the system from getting dirty. After that air passes
through a fine filter, which catches finer dust and even the smallest pollen particles.
Filter guard (option)
An optional filter guard for the unit monitors the cleanliness of the unit and the filters. The
setpoint of the filter guard is set individually for each dwelling so that the filter guard indicator
lights up at fan speed 3 or 4 when the filters are clean .
Heating of outdoor air
During the heating season, heat included in extract air is used to heat air coming from the
outside. Heat is transferred in the heat recovery cell through laminas, and extract air never
mixes with air coming inside. This may provide all the heating needed. The ventilation units
are, however, equipped with a post-heating radiator, which can be used to warm air if more
heating is needed.
Warm
extract air
+22
°
C
Fresh
outdoor air
-5
°
C
Preheated
fresh air coming in
+13
°
C
Cooled
extract air going out
+12
°
C
HEAT RECOVERY UNIT
Winter and frosts
When temperature in winter falls below –10…–20
°
C, the intake of outdoor air is limited
by stopping the supply air fan. This prevents the water condensing in the unit from extract
air from freezing.
For indoor air to stay healthy and beneficial also for the structures of the dwelling, ventilation
has to be in operation continually. It is not advisable to stop ventilation even for longer
holidays, because it makes indoor air stuffy. Also, during the heating season indoor air
humidity may condense in the ducts and structures and therefore cause humidity damage.
Filter guard indicator lamp
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