Miele TWB 120 WP Operating Instructions Manual page 11

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Heat-pump technology and refrigerant:
The heat pump in this tumble dryer uses a gaseous refrigerant which
is condensed by the compressor. The refrigerant, which is brought to
a higher temperature level and liquified by condensing, is 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 during the drying
process are normal. This does not impair the efficient functioning
of the dryer.
– The refrigerant is not flammable or explosive.
– This tumble dryer contains fluorinated greenhouse gases.
Hermetically sealed.
Designation of refrigerant: R134a
Amount of refrigerant: 16.6 oz (0.47) kg
Global warming potential of refrigerant: 1430 kg CO
Global warming potential of appliance: 672 kg CO
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This product may contain chemicals known to the state of
California to cause cancer or birth defects or other reproductive
harm.
IMPORTANT SAFETY INSTRUCTIONS
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