9
EN
Installation instructions
NOTE: The ventilation ducts must be plugged
close until the ventilation system is taken into
use. This is in order to keep warm air from
flowing into the duct. Warm air causes con-
densation if it meets cold outside air or sur-
faces in the duct. Furthermore the plugging
keeps dirt and other unwanted particles from
clogging the system.
Insulating ventilation ducts
Insulate the ventilation ducts appropriately. This is
especially important when the ventilation unit comes
with cooling functionality.
Ventilation ducts must be thermally insulated to pre-
vent water from condensing to the inner or external
duct surfaces in any circumstances. Additionally, the
air temperature must not decrease or increase exces-
sively in the ducts because of external factors. The
ventilation engineer calculates the insulation require-
ments depending on the placement of the ducts and
the air temperatures.
Ventilation duct thermal insulation in heating use
Supply air duct from
the ventilation unit
to the supply valve
The insulation must be
designed and implemented
so that the maximum air tem-
perature change in the duct is
less than 1°C.
Extract air duct from
the extract valve to
the ventilation unit
The insulation must be
designed and implemented
so that the maximum air tem-
perature change in the duct is
less than 1°C.
Ventilation duct thermal insulation in cooling use
Supply air duct from
the ventilation unit
to the supply valve
The insulation must be
designed and implemented
so that the maximum air tem-
perature change in the duct is
less than 1°C. At least 18 mm
of cellular rubber insulation
on the duct surface and suffi-
cient additional insulation.
Extract air duct from
the extract valve to
the ventilation unit
The insulation must be
designed and implemented
so that the maximum air tem-
perature change in the duct is
less than 1°C.
Building the ventilation system
Designing the ventilation system must be done by a
professional ventilation designer. By following closely
the design plan when building the ventilation system,
you ensure the operation of the whole ventilation
system and customer satisfaction. Use the Enervent
Energy Optimizer calculation program at the Enervent
home page to calculate the performance and esti-
mated heating/cooling power of a particular ventila-
tion unit.
• Use type-approved factory made materials when
building the ventilation system.
• Use valves that are suitable for mechanical
ventilation
• Do not cover the outside air grating with mosquito
net. This would make it very difficult to keep clean.
• Prevent rain water and snow from entering the out-
side air and exhaust air duct.
• Install enough inspection hatches in the ventilation
network to enable cleaning of the ventilation ducts.
• To make it easier to find the inspection hatches,
mark their location for example on the rafters.
• Ventilation systems for different fire zones must
be separate. For example garage is one fire zone
whereas living quarters are another fire zone, which
means that they cannot be connected to the same
ventilation system.
• Use a cooker hood with its own fan in the kitchen,
above the stove. The cooker hood should have
its own extract duct directly out. A motorless
cooker hood can be connected to the ventilation
unit only if the ventilation unit has a cooker hood
connection.
• A drying cabinet with its own fan can be indirectly
connected to the outlet valve using the connection
system that comes with the drying cabinet. If this is
done, some of the extract air will be taken from the
living space and some from the drying cabinet. The
extract air must flow through the valve at a speed
of 12 litres / second minimum
• Install silencers at least in the supply and extract
ducts.
• The amount of silencers must be considered case
by case.
• We recommend that automatically closing damp-
ers are installed in outside and exhaust air ducts. In
case of a power failure, the dampers will close and
block out cold air, preventing any water coil from
freezing. If cold air gets into ventilation ducts, it will
create condensate when mixing with warm air.
• Install pressure-difference transmitters in the ducts
if the unit is to be constant duct pressure controlled.
