Miele Heat pump dryer Operating Instructions Manual page 10

Warning and Safety instructions
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Heat pump technology and refrigerant:
The heat pump in this tumble dryer uses a refrigerant which is
condensed by the compressor and led in a closed circuit through
the heat exchanger unit where heat exchange with the circulating
drying air takes place.
– The humming noises caused by the heat pump are normal and do
not impair the efficient functioning of the dryer.
– The refrigerant is not flammable or explosive.
– In general it is not necessary to leave the dryer standing for any
length of time before it is connected to the mains provided it has
been transported and installed correctly (see "Installation and
connection").
If it has not been transported as described, ensure that the
recommended standing time prior to first operation is observed.
Otherwise the heat pump can be damaged.
– This tumble dryer contains fluorinated greenhouse gases. They
are hermetically sealed.
Designation: R 134a
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