173_58300000002379_ara_en_j.doc – 29.04.14
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To 3.)
For the calculation of a refrigerator‘s declaration value according to
IEC 60704 at least 3 or up to 6 compressor runtimes have to be
recorded and time-averaged in the correct way. Smartphone apps
cannot do such post processing. Usually only real time values are
given or short time averages are calculated. But averaging of several
compressor runtimes requires measurement of up to several hours. In
this time no disturbing noise may occur in the test environment. This is
hardly to fulfill at home.
To 4.)
Often applications are not created by professional programmers by
the help of acoustic experts. Thus it must be expected that the
correctness of such an app is not certified and approved. Therefore it
is not guaranteed that the right algorithms have been applied to give
the correct sound pressure level. Most likely the results are not
conform to international standards and thus cannot be compared with
the manufactures declaration value.
(At trials by the acoustic experts of B/S/H differences of up to 40dB
between the different apps and smartphones have been observed.
This shows how unreliable the given results can be.)
To 5.)
Regular apartments do not give an appropriate test environment for
comparable noise tests to verify the declared noise value. Apartments
or houses are very different to each other regarding dimensions,
surfaces and furniture. This means many individual parameter have a
significant influence on the acoustical behavior and thus on the test
results. This is another reason why a customer cannot verify a noise
declaration value at home. It needs specially designed noise
chambers meeting the requirements of international standards.
2.11 Odours
Our appliances are manufactured from plastics which conform to the
Lebensmittel-Bedarfs-Gegenstands-Gesetz (Ordinance on Food
Products and Articles for Domestic Use) (suitable for food, non-toxic,
etc.).
However, when an appliance is delivered (in a warm condition), it has
a typically plastic odour which disappears when the appliance is
switched on. If the complaint does not occur as soon as the appliance
has been switched on, the offensive odour and flavour cannot be
caused by the appliance.
2.11.1 Complaints about odours
Appliance switched off and the appliance door closed
If the appliance is switched off for a prolonged period (e.g. during the
annual vacation). The door kept closed and not or only partially
cleaned, a musty odour develops in the appliance.
Information in the operating instructions:
Switch off, disconnect the appliance
►
If the appliance is not to be used for a prolonged period:
Switch off appliance, defrost freezer compartment (if
featured), clean entire appliance, keep all doors open.
Remedial action:
Clean appliance thoroughly and ventilate. When the appliance is
switched on, the odour can no longer be detected in the cold
appliance.
Produce stored open (unwrapped) in the appliance
Especially critical is the storage of citrus fruits. Citrus fruits which have
been treated with chemicals may produce a “chemical” odour inside
