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12 MUW216743-2
3.4. DOS Venting
Note: Instruments are NOT to be processed during
DOS venting.
The dispensing system for liquid chemical agents can only
dispense reliably if the system has been purged of air.
The DOS system must be vented:
• if the dispensing system is being used for the rst time
• if the liquid cleaning agent container was not relled or
replaced in time and the DOS system was sucked dry
(giving F518 or F519).
Before venting, ensure that the liquid chemical agent
container is suciently full and the siphons are securely
screwed to the containers. Push the suction tub/oat down
towards the bottom of the container. Only one DOS system
can be vented at a time.
Open the menu as follows:
button
Settings
DOS venting
DOS...(name of dispensing system)
Automatic venting will start when the dispensing system is
selected. Once started, the automatic venting process can no
longer be cancelled.
Select a dispensing system using the UP and DOWN buttons
(∧ ∨).
Press OK to start the venting process.
Automatic venting is successfully completed when the
following message appears in the display:
If the DOS3 system is vented, it is important to run at least
one rinse cycle, otherwise foaming will occur.
Detergent dispensed via dosing system
DOS 1 - Marked blue
Liquid detergent is dispensed from a 5 litre container via
the dosing system (DOS 1). The cap or lines on the tubing
are marked in blue. The 5 litre container is connected to the
machine by screwing on the blue marked suction tube.
Once tted ensure the tube is pushed to the bottom of the
container. When the container is nearly empty the screen
will display ‘DOS rell’ and it is time to replace it with a new
container to the blue suction tube.
If the chemical is renewed immediately there is no need
to vent, but if delayed for more than one cycle venting
becomes necessary.
Place the container on the oor next to the machine or in an
adjacent cupboard. Make sure that the dispensing hose is
not kinked or trapped.
Vent the dispensing system as necessary.
Adding and dispensing chemical agents
49
Neutralising agent
For certain programmes, neutralising agent is dispensed in the interim
rinse phase after washing, to help prevent discolouration and
corrosion spots on the instruments (especially around jointed areas).
Neutralising agent (pH setting: acidic) neutralises any residues of
alkaline cleaning agents on the surface of the load.
Neutralising agent is dispensed automatically in the
Interim rinse
phase after the main wash (see Programme charts). The reservoir
must be filled and the dispensing system vented for this to occur.
Place the neutralising agent container (red marking) on the open
cabinet door or on a surface which is robust and easy to clean.
Unscrew and remove the siphon. Place the siphon on the open
cabinet door.
Replace the empty container with a full one.
Push the siphon into the opening of the container and screw it back
on tightly. Observe the colour coding.
Wipe up any spilled process chemical thoroughly.
Place the container on the floor next to the machine or in an
adjacent cupboard. Make sure that the dispensing hose is not
kinked or trapped.
Vent the dispensing system as necessary (see "Settings / Venting
DOS").
Check consumption regularly by checking the fill levels in the supply
containers and replace containers in good time to avoid the
dispensing system being sucked completely dry.
Refilling
neutralising agent
Checking
consumption
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