Ken DW 412 User manual

KEN DW 412
KEN A/S
DK-5672 Broby
Tlf.: [phone], fax: [phone]
internet: www.ken.dk, e-mail: [email protected]
From machine No.:59.480
To machine No.: xx.xxx
INSTRUCTION MANUAL DISH WASHER
GB
0543

KEN DW 412
Subject to alterations 8/10/2014
Changes to Manual
No. Date Changes on page numbers Importance Initials
On 17/09-2013 New software introduced + KEN A/S - AHE
01 10/08-2014 8.2, 8.3 + SJA/SFM
02
03
04
05
06
07
08
09
10

17/9/2013
KEN DW 410
Ret til ændringer forbeholdes
General .............................................................................1
Introduction ..................................................................................................1.1
This instruction manual................................................................................1.1
Safety/environment ...........................................................2
Safety, general.............................................................................................2.1
Personal safety ............................................................................................2.1
-personal safety, continued..........................................................................2.2
The enviroment............................................................................................2.2
Disposal .......................................................................................................2.2
Technical description ........................................................3
Dimensional sketch:.....................................................................................3.1
Technical data ............................................................................................3.2
Installation instructions......................................................4
Receipt/transport/unpacking ........................................................................4.1
Disposal of packaging..................................................................................4.1
Installation/connection .................................................................................4.1
-installation/connection, continued...............................................................4.2
User instructions ...............................................................5
Operation panel ...........................................................................................5.1
Start-up ........................................................................................................5.1
Operation .....................................................................................................5.1
Water change ..............................................................................................5.2
Replacing the detergent can........................................................................5.2
Operating disturbances................................................................................5.2
Wash-up tips................................................................................................5.3
Program built-up................................................................6
Wash programs ...........................................................................................6.1
Wash pressure.............................................................................................6.1
Maintenance......................................................................7
Daily maintenance .......................................................................................7.1
Preventive maintenance ..............................................................................7.1
General information about stainless steel....................................................7.2
-general information about stainless steel, continued..................................7.3
Instructions -keep the good corrosion resistance of the steel......................7.3
Preventive washing with water. ...................................................................7.3
Removal of stains and discoloration on stainless surfaces. ........................7.4
Adjustments by computer control......................................8
Access to computer control .........................................................................8.1
Main Menu ...................................................................................................8.2
Service Menu - detergent consultant menu .................................................8.3
Other adjustments/inspection............................................9
Adjustment of Rinse aid pump.....................................................................9.1
Detergent consultant .........................................................10
Calibrating detergent by conductivity dosing ...............................................10.1
-calibrating detergent by condutivity dosing, continued ...............................10.2
Table of Contents

17/9/2013
KEN DW 410
Ret til ændringer forbeholdes
Exhaustion ........................................................................11
Description...................................................................................................11.1
Improved working environment....................................................................11.1
Ventilation data ............................................................................................11.1
Trouble shooting/error codes ............................................12
General comments concerning error codes.................................................12.1
Error codes short list....................................................................................12.1
Display/error #20 - #35 ................................................................................12.2
Display/error #36 - #54 ................................................................................12.3
Display/error #55 - #”200 .............................................................................12.4
KEN NetCom (Optional equipment) ..................................13
EU Declaration of conformity.............................................14
Warranty/Service...............................................................15
Parameters........................................................................16
Adjustments of the machine ........................................................................16.1
-adjustments of the machine, continued ......................................................16.2
-adjustments of the machine, continued ......................................................16.3
Program parameters....................................................................................16.4
Detergent adjustments.................................................................................16.5
Diagrams...........................................................................17

KEN DW 412 Section/page:1.1
Subject to alterations 17/9/2013
General
Introduction
KEN Machines are developed and tested in cooperation with hospitals and
laboratories to ensure optimal functionability and reliability of operation, as
well as to ensure that personal safety and environmental protection are
given pride of place.
To attain this goal it is important that you follow the factory
instructions concerning installation, start-up and use of the machine.
We therefore ask you to read these instructions carefully before you
start using the machine.
If you contact us concerning the use of the machine, available baskets,
servicing and ordering of spare-parts, please state the following information:
Machine type:
Machine No.:
Information on the EU Declaration of conformity is available in section 13.
This instruction manual
This instruction manual has been made to cover the widest possible range
of combinations, which means that features may be described herein that
are not found on the machine you have acquired; conversely, a few of the
details on your machine may not be described in this manual.
If you need more information about any such detail, please do not hesitate
to contact our service department.

KEN DW 412 Section/page:2.1
Subject to alterations 17/9/2013
Safety/environment
Safety, general
This machine range has been designed in accordance with the prevailing
EU directives. A list of these directives is given on the EU Declaration of
conformity, section 14.
Wherever this manual explains matters that may be of danger to the
staff or others, this icon will be found against the section in question.
Personal safety
This machine range uses electricity, hot water and chemicals for the
cleaning process. In addition to the directives mentioned above, the design
of the machine also ensures that the daily user is not exposed to any danger
if the machine is used normally - or, indeed, if it is used inappropriately.
Below follows a list of situations where danger may arise if the machine is
not used in accordance with the instructions:
Scalding:
The machine offers protection against scalding if the door is opened
unintentionally.
Chemicals/caustic effect:
NB! When chemical canisters are exchanged, precautions must
always be taken against chemicals getting sprayed into eyes or on
skin, protective glasses must be used together with gloves.
In addition, the instructions from the chemical supplier must be
complied with at all times.
Electrical shock:
All live components that may represent a danger are placed behind screens
that can only be removed by the use of tools.
NB! These screens must only be removed by specially trained
technical staff.
Inhalation of vapours:
If generally recognized chemicals are used for washer/disinfectors, there
will normally be no health problems involved in using the machine.
NB! If chemicals are used for which the manufacturer or the health
authorities state that inhaling the vapours in question may involve a
danger, a direct exhaust system must be established from the
machine, or, if this is not possible, from the room, near the machine.

Section/page:2.2
Safety/environment
KEN DW 412
Subject to alterations 17/9/2013
-personal safety, continued
Transport:
In transit and when the machine is handled, common sense and good
practice must be applied. See also section 4.
Installation/connection:
Installation of the machine must be carried out using the good practice.
See also section 4 - Installation instructions
NB! Connection of the machine to the electricity and water supply and
to the drains must only be carried out by persons duly authorized to
do so.
The enviroment
Environmental protection has been promoted to the greatest possible
extent.
The low water consumption of the machine ensures that also the
consumption of energy and the necessary chemicals for the cleaning
process are kept to a minimum.
The machine is made from materials - mainly stainless steel - which can be
recycled to a very large extent.
Disposal
When the machine is to be disposed, the computer control and the
chemicals canisters with their hoses must be removed and treated as
chemical waste, in accordance with local/national provisions on waste
disposal.
Apart from this it is not necessary to take any special measures when
disposing of the machine.
As stated above the greatest majority of the materials can be recycled, and
the machine contains no hazardous or environmentally toxic substances
that require special treatment.

KEN DW 410 Section/page:3.1
Subject to alterations 17/9/2013
Technical description
Dimensional sketch:

Section/page:3.2
Technical description
KEN DW 410
Subject to alterations 17/9/2013
Technical data
Basket dimensions: Square, max 500 x 500 mm
Round, max. ø540
Washing area (W x D x H): 600x540x450 (inside volume)
Washing and rinsing system: Rotary washing and rising system
Rinse water consumption per wash: 2,4 litres
Nozzle pressure washing system: 5/9 (low/high) mVc
Wash tank capacity: 30 litres
Water intake at refill: 25 litres
Minimum water pressure
(flow pressure):
200 kPa at 15 litres/min
Maximum water pressure: 800 kPa
Electrical connection: Standard 3x400 V-N-earth 50 Hz
Special voltage on assignment
Connecting power / fuse: Standard: 9,9 kW / 16Amp.
Heating elements: Standard: Wash tank 9kW-Rinse tank 9kW.
Water connections: 3/4” pipe thread, temperature: standard 50° C, max.
60°C. Connection to cold water possible
Drain: Ø32 mm
Drainage flow: Max. 0,5 L/sec.
Programs: P1: 1min. 42sek., P2: 2min. 42sek.
P3: 4min. 42sek. P4: 10min. 42sek.
Hood material: Moulded polyurethane integral foam
Colour, standard: RAL 7021 antracite grey
Colour, alternatives: On assignment
Hood lifting: Automatic. Locked during program.
Noise level: 65,5 dB(A) (high wash pressure)
Surface temperature: Hood max. 45°C
Rinse aid dosage: Integrated pump
Automatic detergent dosage: Integrated pump and control for all types of detergent
Solid detergent: Prepared
Steam heating: Optional equipment.
Steam condenser: Optional equipment.
Exhaustion, connecting branch and
electric control:
Standard at right side of machine. Ventilation pipe
ø100 - ø160 mm.
VA-approval: No. VA 3.44 / 17123
Operation panel: Pushbutton panel
Control: Microprocessor :
Program cycle, rinse temperature and error text
appear on the display
Optional customer adapted programs
Height adjustable system Optional equipment
NetCom Optional equipment

KEN DW 412 Section/page:4.1
Subject to alterations 17/9/2013
Installation instructions
Receipt/transport/unpacking
Check immediately whether the machine has been damaged in transit.
If so, complain to the carrier immediately.
The easiest way of transporting the machine is by means of a pallet forklift.
Disposal of packaging
Packaging is separated into: Wood, cardboard and plastic, and is disposed
of in accordance with local/national rules on waste disposal.
Installation/connection
Table connection:
Lead the entry edge on the table into the machine; the table finishes with a
15 mm entry edge to be placed on the machine edge. Install the tables with
a slope towards the machine to allow the water to run into the machine.
If the machine is to be placed in a corner, do not place any underneath
shelves closer than 500 mm to the machine front plate to allow service.
Water connection:
Connect the machine to cold or hot water, min. 5°C and max. 65°C.
It is important to keep the flow pressure at 15 l/min. at min. 200 kPa and to
never let the static pressure exceed 800 kPa.
Measure the pressure at the machine entry hose.
The coupling line to the machine must be fitted with a blocking valve and a
non-return valve, possible combined as a settable non-return valve.
If the machine is equipped with a rinse aid system or a dosage system, this
must be protected against backflow in line with the VA approval of the
equipment concerned.
The machine must be connected to the water installation with the
accompanying hose or another VA-approved hose.
Poss. decalcifying filter/softening system:
See special instructions for installation, but be aware that the filter may be
connected to max. 65°C hot water as regards KEN filter types TB and MB.
Drain:
The machine can be connected to a floor drain, a sink drain or directly to the
downpipe. In the two last-mentioned cases, a ø50 mm watertrap is required.
The drain pipe may be horizontal, but may not be taken more than 5 m away
from the machine. The water must be able to run off the machine of its own
accord. If required, fit a drain pump to the machine. In such case, remember
that the drain pipe must be lifted to the level shown at illustration.
Total machine weight: Excl. packaging Incl. packaging
KEN DW 412 102 kg 116 kg
Drain pipe

Section/page:4.2
Installation instructions
KEN DW 412
Subject to alterations 17/9/2013
-installation/connection, continued
Electricity:
Voltage 3x400V 50Hz. Connect the machine with a 2.5 mm², 5-wire cable
(3 phases, neutral and earth). The fuse size for a 9kW heating element is 16
Amp. Heating elements in wash and rinse tank cannot be engaged at the
same time. For places where a neutral wire does not exist, the machine
must be equipped with a transformer. The machine must be earthed in
accordance with regulations. A main switch must be installed, which is only
to be operated for service. The water connection must be ready before the
power to the machine is turned on.
NB! Check the direction of rotation of the pump before starting up the
machine. If the direction of rotation is wrong, exchange two phases.
Rinse aid:
The integral rinse aid pump has been preset to approx. 2 ml per 10 l.
If this is to be changed, see section 9 - Rinse aid pump, adjustment.
Detergent:
If a detergent dosage unit is built in it has been reset from the factory.
The setting is to be made via computer, see section 8.3 - Detergent
consultant menu.
Front plate.
To loosen the front plate by releasing 2 screws in the bottom of the machine.
The front plate can now be pulled out and released.
Adjustments of leg height:
There are 2 setting options + fine adjustment by adjusting screws.
New height area is obtained by moving the pin (see illustration)
Remember to fasten the screw on the back of the leg.
The indicated measurements are from floor to lead-in edge of the machine.
Adjustment from factory: 890 mm
Adjustment/lower hole: 840-890 mm
Adjustment/upper hole: 890-950 mm
Total adjustment: 840-950 mm.
Aligning of machine:
When the machine is placed and the wanted height is obtained, it must be
aligned to be level by the adjusting screws.
This is measured on the edges.
Adjustment of working height for automatic raise/lower:
From 800 mm to 1000 mm. (option)

KEN DW 412 Section/page:5.1
Subject to alterations 18/9/2013
User instructions
Operation panel
Start-up
1. Check that the filter has been cleaned, the standpipe is in place and
closes tightly.
2. Press the ON/OFF key. Follow the guidelines on the display.
3. When the machine is ready the hood is openening; a program can now be
selected.
Operation
1. Select a program. Settings can be changed with the assistance of a KEN
service technician.
2. Press start. The hood closes and green light indicates the machine is in
operation.
3. When the program is completed the hood opens and the green light turns
off.
Green light = runs
Red flash = alarm
Display
Standby
ON/OFF
Alarm sign off
Select program
UP
Select program
DOWN
Start
(open/close hood)

Section/page:5.2
User instructions
KEN DW 412
Subject to alterations 18/9/2013
Water change
Change the water when required. In the service menu it is possible to set
the machine to give an automatic warning if a change of water has not been
made, for example after 50 wash cycles. The operator must accept the
warning before the machine can be started up again.
Water change without drain pump:
To make a water change without a drain pump, lift up the standpipe and the
water will run out of the machine. When the water is out, clean the filter and
put the standpipe back in.
Water change with drain pump:
To make a water change with a drain pump press both arrow keys
simultaneously when the display shows “SELECT PROGRAM”, to drain
the water from from the machine.
Water change is also possible by using the Main Menu, see section 8.2 -
Adjustments by computer control.
NB! The machine has to be turned off before draining the water.
The start-up procedure is repeated - see page 5.1.
Replacing the detergent can
When the detergent can is empty it must be replaced.
If the detergent can is completely empty, air bubbles possibly arise in the
hoses. To avoid this and to gain correct dosing of detergent at first wash
cycle after replacing the detergent can, use the “MAIN MENU /
DETERG.CONSULT.” to dose the detergent for up to 10 seconds.
See section 8.2 - Adjustments by computer control.
Operating disturbances
In case of operating disturbances, the red lamp at the display will flash and
an error text is shown on the display.
KEN microprocessor control is able to diagnose a number of errors in
machine installation, operation or components errors that have given or are
about to give operating disturbances.
Significant and insignificant errors are distinguished.
In case of a significant error the process stops immediately; the display
shows the cause of the error and the red lamp flashes.
NB! You must sign for the error before the machine can operate again
by pressing the C key.
A detailed overview of error codes and error possibilities is located in
section 12 - Trouble shooting/error codes.
NB! Only try to remedy an error if the cause has been clearly identified
and if no intervention in the technical components of the machine is
required.
OTHERWISE, CALL A TECHNICIAN!

Section/page:5.3
User instructions
KEN DW 412
Subject to alterations 18/9/2013
Wash-up tips
Pre-rinse:
The easiest way to remove large particles and food leftovers from the
tableware is by rinsing it; possibly, a rubber scraper could be used. Use cold
or tepid water, never hot water. If the water is warmer than 35°C, the dirt will
get stuck.
Wash:
If you wash mixed cutlery, you may want to place it in the special holds with
the shaft down; only a handful in each. Put the cutlery in the machine and
press the Start key. If the cutlery is not entirely clean after the wash, choose
a program of longer duration. Place the cutlery in the wash basket. Place
cups, glasses, bowls, etc. with the bottom up.
Dishes are washed most easily in the cup basket. Make sure there is space
between the individual items.
NB! Do not wash items made from regular iron, as it may result in fly
corrosion.
Working Procedure:
While the machine is washing a load, the procedure should be that the pre-
vious load is air-drying for as long as it takes to fill up the machine with the
next load. Glasses and cutlery should be wiped off while still warm.
The machine can wash 20 - 40 cycles depending on the quality of the
pre-rinse, without changing the water.
When the work is finished, lift up the standpipe and the water will run out of
the machine.
NB!! Remember to turn off the machine before the draining the water.
Clean and wipe off the filter and wash tank every day.
It is important to leave the machine overnight with the hood open to ventilate
the machine.
Placement:
To gain optimal washing properties it is important to place the tableware
appropriately in relation to the washing arms. Place plates to ensure that the
washing water from the upper washing arm hits the front of the plates.
See drawing.
FRONT FRONT---- eller ----
OR

KEN DW 412 Section/page:6.1
Subject to alterations 17/9/2013
Program built-up
Wash programs
KEN DW410 has 4 programs.
A program consists of:
The programs can be adjusted individually, see section 3.2 - Technical data.
Adjustment of the programs requires specially trained staff and can only be
carried out by knowledge of the special codes required.
These codes are handed out in connection with courses at KEN.
KEN’s dishwasher’s are adjustet from the factory to wash at 57°C and rinse
at 80°C. If the right temperature has not been reached, the program will be
terminated and a warning is shown on the display.
Wash pressure
KEN DW412 has 2 wash pressures:
- high pressure used for pots and pans.
- low pressure applied to glass, cups and other service.
Wash pressure’s can be set individually for each program and there is a
opportunity to select programs with high pressure, low pressure or high/low
pressure.
Low pressure:
The program can only be startet with low washing pressure.
The display shows “L”.
High pressure
The program can only be startet with high washing pressure.
The display shows “H”.
High/low wash pressure:
Both wash pressure can be selected for the program, the display shows
“ L/H”.
For high pressure press down the start button until the hood starts to go
down - the display change to “H”. For low pressure press down shortly on
the start button - the display change to “L”.
Low/high wash pressure:
Both wash pressure can be selected for the program, the display shows
“ L/H”.
For high pressure press down the start button until the hood starts to go
down - the display change to “H”. For low pressure press down shortly on
the start button - the display change to “L”.
Wash incl. detergent dosage
Pause
Rinse
Pause
Opening
Enclosed a start key which
can be placed on the wall
under a table og similar.

KEN DW 410 Section/page:7.1
Subject to alterations 17/9/2013
Maintenance
Daily maintenance
Regular cleaning:
Clean the outer surfaces of the machine with a moist cloth, possibly using a
polishing agent for stainless steel.
NB! Never use a water hose, pressure rinser or similar.
Chemicals:
Check daily the level of detergent and any other chemicals used in the cans.
Wash and rinse arms:
Check and secure that the wash and rinse arms can rotate freely and that
the nozzles are not clogged.
If a clogged nozzle is unable to be cleaned from the outside, the arms has to
be dismounted and rinsed.
Filter:
Empty the machine for water.
NB!. The machine has to be turned off before draining the water.
Lift up the filter from the wash tank and clean it.
Clean the upper level sensor.
Clean the bottom tank underneath the filter for broken glass, lint, toothpicks
or similar and re-install the filter. Remember to place the standpipe.
NB! Be careful when cleaning the filter and the bottom tank, as there
may be sharp objects.
Preventive maintenance
In addition to the daily maintenance described, it is recommended to carry
out regular inspections to ensure that the machine functions optimally at all
times.
The spindle for the lifting motor must be lubricated after 50.000 washes or
once a year. Use approximately 1 ml of Super Lube (corresponding to 1 cm
on the tube). Do only use the lubricant which is specified by KEN,
Super Lube (spare part No.: 7604545)
NB! All preventive service and maintenance, which require removal of
the machine cladding plates by the use of tools, may only be carried
out by specially trained technical staff.

Section/page:7.2
Maintenance
KEN DW 410
Subject to alterations 17/9/2013
General information about stainless steel
Stainless steel is often chosen because of its attractive appearance more
than on the basis of a wish for long service life and low maintenance costs,
while in fact those are the most prominent qualities of this material.
However, all materials including stainless steel, are discoloured after a time
due to dirt, oil, grease, soap or pollution of the water, etc.
Stainless steel - description
Stainless steel is a general designation covering a large group of materials
which share the property of containing minimum 13% chromium (Cr), which
makes them resistant to rust attack. The chromium in the steel reacts with
the oxygen in humid conditions to form a very thin chromium-oxide film that
protects the material against corrosion.
If this film is attacked, either mechanically or chemically, it is reformed
spontaneously if or when the surface gets into contact with oxygen, even in
such low concentrations as exist in normal water.The higher the chromium
content, the better the corrosion resistance of the steel. This good property
is further reinforced with increased molybdenum content (Mo).
At particularly exposed spots, sheets and pipes with a content as high as
2.7% are used. In addition to chromium and molybdenum, nickel content
has been added, primarily to give the steel a structure (austenitic) that
makes the material easy to shape and weld.
Conventional types of stainless steel have a chromium content of approx.
18 % and a nickel content of approx. 8-9% and are called 18/8 steel or
"ordinary stainless".
These types of steel are used primarily for kitchen utensils, the food industry
and other indoor purposes. In particularly aggressive environments, as in a
dishwasher for industrial purposes, it is necessary to use molybdenum alloy
steel at exposed locations to ensure adequate resistance to corrosion.
The occurrence of chlorine, acid, moisture and high temperature are all
parameters that generate an environment that is aggressive to stainless
steel.
That is why KEN A/S uses stainless steel with molybdenum content at
exposed locations in machines subject to particularly harsh environments.
Warning! In this context, we must warn you against using soap with
high chlorine content (higher than 5%) and a low pH value
(lower than 10). Such a composition is highly aggressive to even the
best steel qualities, like the ones we use.
In special cases, the guarantee against corrosion of the steel may be
lost completely.
Discoloration may occur:
1. If the steel is exposed to an environment that is more aggressive than the
steel is intended to handle, i.e. highly polluted air, saline solutions or large
residue or concentration cleaning agents containing chlorides.
2. If the surface is polluted by iron particles from cleaning sponges,
defective baskets or other iron items from which small particles may "drip"
down into the machine.
3.
If the machine is connected to extraction ducts that are not corrosion-proof.
4. If the water contains a lot of iron and/or silicates.
5. Another kind of discoloration may also occur as a set-off from copper
piping used in connection with the installation connecting the machine.

Section/page:7.3
Maintenance
KEN DW 410
Subject to alterations 17/9/2013
-general information about stainless steel, continued
The risk of harmful corrosion in the first case is considerably reduced or
entirely eliminated if molybdenum alloy stainless steel is used. In case 5, the
surface will become brownish, which does not mean anything to the surface
of the steel apart from the cosmetic appearance. In cases 2, 3 and 4, the
surface of the stainless steel will be discoloured. This occurrence of rust will
occur most frequently on horizontal surfaces in the machine and may often
be felt with the tips of ones fingers. Small particles will set off a small rust
spot that will not normally harm the steel. Larger items (hair needles,
roasting chucks, coins, capsules, etc.) also set off rust colour on the surface
of the plate, but also makes it possible for a very aggressive environment to
develop between the item and the plate. Under these unfavourable
conditions, strong hydrochloric acid forms that is always harmful to the
material. It is thus important to clean the machine every day of deposits of
any type. If necessary, cleaning can be done with a sponge (not one
containing iron) and foam powders, etc.
Instructions -keep the good corrosion resistance of the steel
1. Make sure any water treatment facility is always ok. A defective facility
may segregate salt to the machine and thus harm the machine.
2. Make sure the machine is cleaned daily and aired. Soap residue, food
residue, iron particles, etc., may damage the machine in the longer term.
3. Never wash items soiled with iron particles without cleaning the machine
immediately after.
4. Make sure to make correct soap dosage, particularly if you do it manually.
If the machine has an automatic system, the soap dosage should be
checked regularly. The check should be made by the soap supplier when
he is there anyway, or you can do it yourself by making a simple pH
measurement (litmus paper). Ask your soap supplier.
5. Use only types of soap that are intended for machine washing and
preferably types with material-protecting substances added.
6. Always comply with the dosing regulations and safety rules.
See the soap suppliers datasheet.
7. Never try to decalcify or clean the machine with hydrochloric acid, etc.,
without expert assistance. Use products approved for the purpose.
Ask your soap supplier.
Preventive washing with water.
Daily cleaning with water removes dirt and prevents corrosion attacks from
getting a foothold.Washing is best done with a sponge and hot water or with
a mild cleaning agent, followed by washing with cold water. Remember to
clean the bottom of the wash tank in particular.
The appearance of the surface can be further enhanced if you use a wrung
piece of cloth or chamois at the end.
There are also a number of oil products on the market for surface treatment
of stainless steel. Ask your soap supplier.

Section/page:7.4
Maintenance
KEN DW 410
Subject to alterations 17/9/2013
Removal of stains and discoloration on stainless surfaces.
If the stain or discoloration of the stainless surface is of such a serious
nature that they cannot be removed by normal water wash as previously
described, the following cleaning methods can be recommended.
Fingerprints:
Wash with ethyl alcohol, thinner or acetone, rinse with clean cold water and
wipe off.
Oil and grease:
Wash with an organic solvent of the above-mentioned type, wash again with
soapy water or a mild detergent, rinse with clean cold water and wipe off.
Difficult stains and discoloration:
Wash with an abrasive cleaning agent and rub in the same direction.
Oxidation colours and more serious stains:
Wash with an abrasive cleaning agent or polish with a Scotch-Brite (yellow/
green) sponge along the surface structure, rinse with clean cold water and
wipe off.
Discoloration as a result of corrosion:
If necessary, wash with an abrasive cleaning agent as previously described.
Paint:
Wash with a lacquer remover (or use a soft nylon brush or sponge), rinse
with clean cold water and wipe off.
Scratches on på polished or brushed surfaces:
Polish with a rotating polish disc (also use an iron-free polisher).
Polish along the surface structure; wash with soapy water or a mild
detergent; rinse with clean cold water and wipe off.
Warning!
Use only the methods described above. Follow safety regulations for
such work and wear rubber gloves and protective goggles.
Make sure there is good ventilation.