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5.4. Air duct
The air duct on the inlet side must always be led
through the wall. The air duct on the outlet side can
either be led directly through the wall, or via an air
hose (see accessories). The wall openings have to
be performed as described later on in this document.
Only if the appropriately dimensioned connection
elements are used, can an effi cient and error-free
operation be guaranteed.
Air inlet and air outlet can be performed via an air
hose in various diff erent ways. The following list con-
tains rules and regulations for the confi guration:
- The air inlet side and the air outlet side should, if
possible, be performed on two diff erent sides of the
building.
- If the air intake side and the air outlet side are
designed on the same side of the building, an air
short-circuit must be prevented by a structural
separation.
- Wall openings have to be protected against foreign
matters (foliage, small animals) from penetrating.
Mesh grilles and protective grating must be installed
in light shafts and on visible walls. The mesh size of
these grids is 12 mm.
- The wall openings must be insulated according
to specifi cations using a closed porous insulating
material (density 50 mm) to prevent a penetration
of humidity.
- If the light shafts are too small that will increase the
pressure loss in the air duct. It is therefore necessary
to ensure that they are suffi ciently dimensioned!
- Light shafts must be equipped with a rainwater run-
off !
- On the air outlet exists an increased risk of frost.
Rain pipes, water-carrying pipes or water-carrying
containers must not be located next to the outlet
side.
(C) IDM Energiesysteme GmbH
5.5. Acoustic evaluation
So u n d -p o we r-l ev e l
The sound power is the sound energy per second
emitted of a noise source. The sound power level is
specifi c to the source of sound, independent of dis-
tance and direction and enables an easy comparison
of diff erent sound emitting devices. The sound power
can only be determined via mathematical calculation
according to international standards of the series
ISO 3740 - based on sound pressure level measure-
ments - as well as ISO 9614, which is based on the
measurement of sound intensity. The sound power
level of the heat pumps can be found in the technical
specifi cations.
So u n d -p r es s u re -l ev el
In contrast to the sound power level, the sound pres-
sure level, which is caused by a noise source can be
measured. The measured sound pressure is depen-
dent on the distance from the noise source and the
receiver location (geometrical divergence) as well as
the local conditions. As the sound pressure level is a
measure of the loudness of noise sensed by humans,
the legislation defi nes limit values, that must not be
exceeded.
So u n d -p r o p a g a tio n -o u td o o r
With increasing distance from a point noise source,
the sound power is distributed on an increasing area
due to spherical spreading. Therefore, the sound
pressure level is continuously decreasing with in-
creasing distance from the noise source to receiver
location. Doubling the distance leads to a reduction of
the sound pressure level of 6 dB(A). Besides the di-
stance from the installation site of the heat pump the
sound, the installation situation and local conditions
also have signifi cant impact on the resulting sound
pressure level at the relevant place of immission.
Installation instructions AERO ILM
Installation
21
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