58300000111195_ARA_en_f.doc – 02.06.09
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4.9
Hot water / steam nozzle
DANGER
Risk of burns!
The nozzle gets very hot.
►
Do not touch the metal parts!
(1) Sleeve with plastic grip
To dispense hot water or to froth
milk, move the sleeve downward
by the plastic grip.
To warm drinks with steam, slide
the sleeve upwards by the plastic
grip.
(2) Tip of nozzle with inlet
Sucks in milk and mixes with air
to make milk froth.
Note:
Every time you froth milk, clean the nozzle immediately
afterwards by dispensing hot water. Dried on milk
residues are difficult to remove.
4.9.1 Function
The steam flows through steam pipe
(A)
and the connected steam nozzle,
thereby creating underpressure
inside the steam nozzle.
This underpressure is balanced out
by fresh air flowing in through
opening
(B)
on the nozzle holder
and
(C)
on the tip of the nozzle.
If the nozzle is immersed in cold milk
to above side opening
(C)
and steam
is dispensed, fresh air flows in
through opening
(B)
on the nozzle
holder. At the same time, milk is
sucked into this air flow through
opening
(C)
, mixed with the flow of
steam and emitted at the tip of the
steam nozzle.
The resulting circulation of sucked
in, mixed and emitted milk, warms
the milk up. The milk froth is created
by the mixing of the milk proteins
with air. The proteins are stable up
to approximately 76 °C.
They are destroyed by higher
temperatures and froth formation is
not possible then.
