Chapter 3 Functional descriptions
66 SMSO-2-02.03- 15.07.03
 Make sure that sufficient air can circulate around the
cooler and clean the cooling ribs periodically.
 Iced up evaporators reduce cooling efficiency and
consume more power. Defrost the appliance once the
layer of ice exceeds 3 mm in thickness. To defrost,
switch the appliance off (set the controller to zero).
Never use a sharp object, such as a knife, to remove
the layer of ice mechanically.
 When no longer required, the refrigerator must be
disposed of in accordance with local waste disposal
regulations.
 The start-up relay becomes warm when the motor
starts. It must be allowed to cool down before restart-
ing. For this reason do not switch the refrigerator on
and off at frequent intervals.
Pipe system
The processes for serving milk and milk foam differ from one
another. For this reason the entire milk pipe system and dos-
ing system from the milk container or from the steam valve to
the foamer head in the coffee outlet is designed as a dual
system. From the outside the systems are differentiated by the
colours of the tubes:
blue: milk
white: milk foam
Valve system
A special valve system ensures that on one hand no water
reaches the milk container while the pipe is being rinsed, and
on the other hand, that during the serving of the product the
pipes are fully siphoned out before they are rinsed. This re-
quires two valves: The pinch valve closes the suction pipe to
the milk container during the rinsing process. When the milk
serving has finished the ventilation valve opens the suction
pipe directly after the pinch valve. In this way the milk pipe to
the foamer head is always siphoned off completely before the
next product is served or before a rinse procedure. In this way
no milk is lost during the rinse procedure.
The pinch valve is activated with a (water) hydraulic cylinder,
the ventilation valve is driven electro-magnetically.
The solenoid valves for the rinse process and to control the
pinch valve cylinder are fitted to the rear of the refrigerator.
Rinse systems
For hygiene reasons the milk pipes are automatically rinsed
with water a certain time after the last milk serving. This is
intended to prevent colonies of bacteria from forming in the
pipe systems.
There are two different rinsing systems and the length of time
within which a rinse operation is carried out differs accord-
ingly.
 Cold water rinse
This rinsing system was incorporated as standard until April
2002. Because only cold water is used to rinse, a brief pipe
rinse operation is carried out automatically approximately 2
minutes after the last milk serving.
 Hot water rinse (hotflush)
This rinsing system has been incorporated as standard since
April 2002. Because the rinsing operation is much more effi-
cient, the time from the last milk serving until the automatic
rinse operation can be extended to up to 30 minutes. During
an operating period, if milk is served regularly, there is barely
a need to carry out the rinse operation, which reduces hot
water consumption and also machine availability.
Foamer head
The foamer head is the most important element in the produc-
tion of milk products. It acts simultaneously as the means of
conveyance for the milk, and as the element that heats and
foams the milk. The driving force here is the steam that flows
through one of the two pipes from the steam generator to the
foamer head, depending on the product selected.
It has a nozzle in each of the steam pipes in the foamer head,
which produces an under-pressure in its surrounding area as
the steam flows out, and thus sucks up milk from the milk
container in the refrigerator. The steam heats up this milk and
it flows through the outlet base of the foamer head into the
cup.
Hot milk / milk foam
The regulation process for the quantity of milk flowing to the
foamer head specifies whether hot milk or milk foam is pro-
duced. In principle the flow of milk is reduced in order to pro-
duce milk foam. There are two elements in the milk foam pipe
to regulate the flow of milk. On one hand it is a baffle, and on
the other an expander (ventilation valve), by means of which a
very precise measure of air is mixed into the milk pipe.
Level sensor (optional feature)
The level of milk in the refrigerator is monitored without con-
tact by means of an ultrasound level sensor.
Drawing symbol
Illustration
Drawing symbol
Illustration
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