Miele G 7825 Manual

							General notes
Problem How to resolve it
If seals, hoses and plastics in the
washer-disinfector suffer damage they
will not be water-tight and will not
function correctly.–Establish the cause of the damage
and rectify it.
See information regarding "Chemical
agents“, "Soiling“ and "Reaction
between chemical agents and soiling“.
Heavy foaming during a programme
affects cleaning and rinsing results.
Foam escaping from the wash cabinet
can cause damage to the
washer-disinfector.
Cleaning processes cannot be
regulated and validated where there
has been a build-up of foam..–Establish the cause of the foam and
rectify it.
–Check the process used regularly to
monitor foaming levels.
See information regarding "Chemical
agents“, "Soiling“ and "Reaction
between chemical agents and soiling“.
Corrosion to stainless steel in the wash
cabinet and to accessories can give
them a different appearance:
– Rust (red marks / discolouration),
– black marks / discolouration,
– white marks / discolouration (etched
surface).
Corrosive pitting can lead to the
washer-disinfector not being
water-tight. Depending on application
corrosion can influence cleaning and
rinsing results (laboratory analysis) or
cause corrosion to stainless steel items
in the cabinet.– Establish the cause of the corrosion
and rectify it.
See information regarding "Chemical
agents“, "Soiling“ and "Reaction
between chemical agents and soiling“.
Chemical processes and technology
31 
						

							Chemical agents
Problem How to resolve it
The ingredients in chemical agents
have a strong influence on the longevity
and functionality (throughput) of the
dispensing system. The dispensing
system (hoses and pumps) should be
set up for a particular type of chemical
agent.
General types:
–Alkaline to pH neutral products,
–acidic to pH neutral products,
–hydrogen peroxide.–Use Miele approved chemical agents
in this machine.
–Carry out a regular visual check of
the dispensing system for any
damage.
–Regularly check the flow rate of the
dispensing system.
Chemical agents can damage
elastomers and plastics in the
washer-disinfector and accessories.– Use Miele approved chemical agents
in this machine.
– Carry out a regular visual check of
any accessible elastomers and
plastics for damage.
The following oxidising chemical agents
can damage elastomers (hoses and
seals) and plastics in the
washer-disinfector:
–
Nitric acid,
–
peracetic acid,
–
products containing active chlorine.The wash temperature should be
limited to:
– 50 °C Nitric acid,
– 35 °C with peracetic acid,
–
80 °C with products containing
active chlorine.
The following chemical agents can
release large amounts of oxygen:
–
Hydrogen peroxide,
–
peracetic acid.–
Only use approved processes such
as OXIVARIO or OXIVARIO PLUS.
–
The wash temperature must be less
than 70 °C when using hydrogen
peroxide.
–
Please contact Miele Service or your
Miele Application Professional for
advice.
Chemical processes and technology
32 
						

							Chemical agents
Problem How to resolve it
The following chemical agents can
cause large amounts of foam to build
up:
–Cleaning agents and rinsing agents
containing tensides,
–emulsifiers.
Foam can occur:
–in the programme block in which the
chemical agent is dispensed,
–in the following programme block if it
has been spilt,
– in the following programme with
rinsing agent if it has been spilt.–Process parameters in the wash
programme, such as dispensing
temperature, dosage concentration
etc. must be set to ensure the whole
process is foam free or very low
foaming.
–Please observe chemical agent
manufacturer's instructions.
De-foaming agents, especially silicone
based ones can cause the following:
– Deposits to build up in the cabinet,
– deposits to build up on the load,
– damage to elastomers and plastics
in the washer-disinfector,
– damage to certain plastics (e.g.
polycarbonate and plexiglass) in the
load being processed.– De-foaming agents should be used
in exceptional cases only, for
instance when absolutely essential
for the process.
– The wash cabinet and accessories
should be periodically cleaned
without a load and without
de-foaming agent using the
ORGANICA programme.
–
Please contact Miele Service or your
Miele Application Professional for
advice.
Chemical processes and technology
33 
						

							Soiling
Problem How to resolve it
The following substances can damage
elastomers (hoses and seals) and
plastics in the washer-disinfector:
–Oil, wax, aromatic and unsaturated
hydrocarbons,
–emollients,
–cosmetics, hygiene and care
products such as creams (analytical
applications).–Refit the washer-disinfector with oil
resistant elastomeres.
–Depending on usage wipe the lower
door seal on the washer-disinfector
periodically with a lint-free cloth or
sponge.
Clean the wash cabinet and
accessories without a load using the
ORGANICA programme.
–Prepare the load
using the "OIL" programme (where
this is available) or use a special
programme that dispenses
emulsifiers.
The following substances can lead to a
heavy build-up of foam during washing
and rinsing:
– Some disinfecting agents and
dishwashing detergents,
– reagents for analysis e.g. for
microtiter plates,
–
cosmetics, hygiene and care
products such as shampoos and
creams (analytical applications),
–
active foaming agents such as
tensides.– Thoroughly rinse items in water
beforehand.
– Select a cleaning programme with at
least one short pre-rinse in cold or
hot water.
– Depending on application use
de-foaming agents that do not
contain silicone oils.
The following substances cause
corrosion to stainless steel in the wash
cabinet on accessories:
–
Hydrochloric acid,
–
other substances containing
chlorides such as sodium chloride
etc.,
–
concentrated sulphuric acid,
–
chromic acid,
–
Particles of iron and swarf.–
Thoroughly rinse items in water
beforehand.
–
Place items drip dried into mobile
units, baskets and inserts and then
place these in the wash cabinet.
Chemical processes and technology
34 
						

							Reaction between chemical agents and soiling
Problem How to resolve it
Natural oils and fats can be emulsified
with alkaline chemical agents. This can
lead to a heavy build-up of foam.–Where available use the "OEL“
programme.
–This special programme dispenses
emulsifiers (pH neutral) in the
pre-rinse.
–Depending on application use
de-foaming agents that do not
contain silicone oils.
Soiling containing high protein levels
such as blood can cause a heavy
build-up of foam when processed with
alkaline chemical agents.–Select a cleaning programme with at
least one short pre-rinse in cold
water.
Non-precious metals such aluminium,
magnesium and zinc can release
hydrogen when processed with very
acidic or alkaline chemical agents
(oxyhydrogen reaction).– Please observe chemical agent
manufacturer's instructions.
Chemical processes and technology
35 
						

							Only use agents formulated
specifically for use in
washer-disinfectors and make sure
you follow the manufacturer’s
instructions.
This machine is fitted with 2 dispensers
as standard:
–Dispensing system DOS 1 (blue) to
dispense liquid cleaning agent. It
can dispense up to 120 ml/min.
– Dispensing system DOS 3 (red) to
dispense acid media such as
neutralising agent or rinsing agent. It
can dispense up to 20 ml/min.
Additional optional DOS modules:
– Dispensing system DOS 2 (white) to
dispense acid media such as
neutralising agent / conditioning
agent. It can dispense up to
20 ml/min.
–
Dispensing system DOS 4 (green) for
low-foaming disinfecting agents
suitable for machine use, or for an
additional cleaning agent. It can
dispense up to 120 ml/min.
The correct amount of liquid agent etc.
required for the application chosen will
then be dispensed through these
dispensing systems.OXIVARIO kit:
This washer-disinfector can be set up
or retro-fitted to use the OXIVARIO
programme by adding an additional
dispenser pump and a special buffer
tank for hydrogen peroxide (H
2O2solution) .
The hose for H
2O2solution is marked
with a black sticker.
The DOS 2 dispenser is used for
dispensing the H
2O2solution.
Further information regarding the
OXIVARIO programme and
connection of the H
2O2solution
container can be found at the end of
this booklet under "Special features
OXIVARIO".
Dispensing liquid chemical agents
36 
						

							Preparing the DOS dispensers
The agents can be filled into 10 l plastic
containers, which are colour coded for
the relevant dispensing system.
When first commissioning, or when the
message FILL DOS 1 CONTAINER
and/or FILL DOS 2, 3 or 4 CONTAINER
flashes in the display after switching on
or at the end of a programme, replace
the storage containers with new ones,
or refill them with the relevant agent.
If the message CHECK DISPENSING
SYSTEM 1 and/or CHECK DISPENSING
SYSTEM 2, 3 or 4 flashes in the display,
check the storage containers,
dispensing tubes and hoses. Then
replace the storage containers with new
ones, or refill them with the relevant
agent.
The programme will stop automatically.
When first commissioning or when
the message CHECK DISPENSING
SYSTEM... appears, start the
DOS-FILL Programme to vent the
dispensing system (see "Venting the
dispensing system").
Take great care when handling
liquid agents and additives. These
may contain irritant or corrosive
ingredients.
Please follow the manufacturer’s
safety instructions.
Wear protective gloves and
goggles.Fill the containers with the relevant
agent
Switch the machine off using the
master switch.
Open the service panel out from the
right hand side, and swing it out to
the left.

Take the storage containers out,
open them and fill with the agent
required, (observe the colour code).
Dispensing liquid chemical agents
37 
						

							Insert the siphon tube into the
container and screw on securely
(observe the colour code).
Once the storage containers have been
filled the relevant message goes out.
Please remember to refill containers
in good time. Do not let them get
empty. It is best to refill as soon as
the FILL DOS 1, 2, 3 or 4 message
appears in the display.
If a container is not being used, the
level query for the unused
dispensing system can be turned off
to avoid the error message (see
"Machine functions, container
query..." in the Programming Manual
supplied with the washer-disinfector).
Dispensing liquid chemical agents
38 
						

							Venting the dispensing system
Before the washer-disinfector is first
commissioned, and later on if one or
more containers has been allowed to
run dry, the dispensing system(s) for
liquid media will need to be vented. To
do this:
Press theI-0button.
Select operating level B.
Select as required:
Programme DOS1-FILL
Programme DOS2-FILL
Programme DOS3-FILL
Programme DOS4-FILL.
(See "Operation/B. Free programme
selection).
Press the Start button.
The DOS-FILL Service Programmes
are allocated to programme places
58-61 ex works, but can be
re-allocated to other programme
places, if preferred.
Dispensing system
maintenance
To ensure trouble-free operation, the
following regular maintenance should
be carried out by a Miele approved
service technician.
Every 12-18 months
Replace the hoses in the dispensing
system(s).
External Dispensing systems
If external pumps are to be used for
dispensing liquid agents, please inform
the Miele Service Department. The
instructions given in the Programming
Manual under "Machine functions" will
need to be observed.
Dispensing liquid chemical agents
39 
						

							Master switch
The master switch with "emergency
cut-off function" is set toI-ON.
Switching on
Open the stopcocks (if turned off).
Press theI-0button.
In operating levels A, B and D the most
recently selected PROGRAMME NAME
appears in the display and in operating
level C AUTOMATIC MOBILE UNIT
RECOGNITION is displayed.
Door lock
The door can only be opened if:
– the electricity supply to the machine
is switched on,
– the red (emergency cut out) master
switch is in theI-ONposition,
– theI-0On-Off button is pressed in,
and
–
a cleaning or disinfection programme
is not in progress.
To open the door
Press thedoor button, and holding
onto the door grip open the door.
To open the door on theClean side
(through-feed model), the following
conditions must also be met:
–DESIN (disinfection) programmes
have been correctly completed,
or
–the door locking function is active
(see "Machine function/Door
Interlock" in the Programming
manual).
Do not touch the heating
elements under the wide area filter
during or directly after the end of a
programme. You could burn
yourself. They remain hot for some
time after the programme has
finished.
If the boiler has been programmed
to BOILER READY, be particularly
careful of hot water and steam when
opening the door. Danger of burning
or scalding. The inlet to the wash
cabinet is located, as viewed from
the unclean side, underneath the
basket runner on the left hand side.
To close the door
Lift the door upwards and push until it
clicks shut.
Operation
40