Air quality
If heat pump is subject to any of the following substances
in the air its‟ life span will be shortened and the guarantee
may not be valid. If the air contains any of the following,
please contact Dimplex for further information:
Sulphur i.e. Near a busy congested road.
Oil i.e. a workshop.
Ammonia i.e. animal stables
Salt i.e. near the sea.
The above conditions will affect all the exposed
components within the heat pump, but especially the
evaporator. Dimplex offer an extra service to coat the
evaporator with a protective coating. This additional
service adds a week to the delivery times. For more
details contact the Dimplex technical team.
Local planning regulation
MCS Planning Standard
The MCS planning standard sets out the method by which
to calculate if the installation would meet the noise limit of
42bB. If the assessed noise level is greater than 42dB the
installation may only still go ahead if planning permission
is granted by the local authority. The value of the noise
level at the assessment position is affected by:
The A weighted sound power level of the heat
pump as given in the technical information
The directivity Q factor as determined by the
number of walls as shown in Figure 10.
The effect of solid barriers between the heat
pump and the assessment position.
The back ground noise level.
Figure 10: Q factors for different surfaces within 1 meter of
the LA MI.
Table 10 and Table 11 show the minimum distance to
achieve the 42bB at the assessment position in the MCS
020 calculation.
A weighted
sound power
level
Table 10: Minimum distances to achieve 42dB if there is a
wall between the heat pump and assessment position
A weighted
sound power
level
Table 11: Minimum distances to achieve 42dB if there is NOT
a wall between the heat pump and assessment position
Compliance with the MCS Planning Standard on its own
does not bestow permitted development rights – there are
a number of other conditions and limitations which must
be complied with for an installation to be permitted
development, some of which are detailed below.
Town and Country planning, England
The following is a summary of the main points for an Air
source heat pump under the Town and country planning
act. The installer should consult the original document for
further clarification and a full list of points. The act states
that planning permission would be required if the:
Installation doesn‟t comply with the MCS
planning standard.
Installation would result in more than one air
source heat pump on or within the grounds of
the building.
Site already has a wind turbine.
For further information see the MCS document
020, “MCS Planning Standards For permitted
development installations of wind turbines and
air source heat pumps on domestic premises.”
Every effort has been made to give accurate
advice on local planning regulations for
England, Wales and Scotland. The following
information is provided with the intension of
making the installer aware that such
regulations exist rather than a definitive guide.
It is essential that the installer verifies the
regulations with the local planning office
before proceeding with the installation.
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