Asko DW20.1 Service Manual page 14

T E C H N I C A L D A T E C H N I C A L D A T E C H N I C A L D AT T T T T A A A A A T E C H N I C A L D A T E C H N I C A L D A
Wiring
The machine is provided with coded contacts to
prevent faulty connection. The wiring conforms
to the standard for Rast 2.5 and 5.
Water softener
The ion exchanger mass is regenerated by opening
the salt valve and admitting salt-saturated water into
the ion exchanger during the main wash. The ion
exchanger is flushed through at the end of the main
wash.
The quantity of salt, the interval (number of
programmes) between the regenerations and the
pre-wash volume are determined by the set
water hardness and the programmes that are
used. The higher the set water hardness and
programme length, the greater the quantity of
salt, the more frequent the regeneration and the
higher the pre-wash volume.
Certain models have a sensor, a so-called reed
switch, which senses when the salt has run out.
Other models have an optical indicator in the salt
filler cover.
Airbreak
Located on the side of the machine is an anti-
siphonage device which prevents dirty water from
being sucked back into the water mains, for example
in the event of a vacuum in the water mains.
Thermistor
The thermistor is situated on the inner door and
checks the water temperature so that the set
temperature is reached. If the thermistor is short-
circuited or if it becomes detached from the
circuit board, the element is switched off.
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Pressure sensor
The pressure sensor is connected to the pressure
chamber in the sump. It measures the pressure
corresponding to the water level in the machine. In
the event of an excessively high water level in the
machine (continuously under 5 sec), the drain pump
starts and other components are switched off.
When right level is reached the programme will
continue. Is the level not reached within one
minute the programme stops and will show a
faulty indication.
Turbidity sensor
Machines with an automatic programme (Auto
wash,) have a turbidity sensor which senses the
turbidity of the water. The sensor consists of an
LED and a phototransistor. The wash process
water is present between these. The smaller the
quantity of light reaching the phototransistor, the
more turbid the water. The sensor is calibrated in
the automatic programme's final rinse. At diffe-
rent times during the automatic programme, the
turbidity sensor's output signal provides the basis
for how the wash programme will proceed (with/
without prewash, temperature, cycle time,
number of rinses, etc.).
In the event of a fault in the turbidity sensor, the
machine assumes "high turbidity", which gives a
long cycle time with prewash and with extra
rinses, etc.
The turbidity sensor is situated on the front edge
of the sump.
Humidity sensor
The humidity sensor is situated in the fan
housing. It is of the capacitive type and measures
the relative humidity. The humidity sensor
measures the ambient humidity before the start
of the drying process. The drying process then
continues until the humidity sensor senses a level
immediately above the ambient humidity. (Min.
time 30 minutes, max. time 70 minutes).