Metos RN 20 User manual

MIXER
RN 20
Service Manual
S/N: Valid from: Rev.: 2.0

5.10.2004 Rev. 1.0
1
Dear Customer,
Congratulations on deciding to choose a Metos appliance for your kitchen activities. You
made an excellent choice. We will do our best to make you a satisfied Metos customer
like thousands of customers we have around the world.
Please read this manual carefully. You will learn correct, safe and efficient working meth-
ods in order to get the best possible benefit from the appliance. The instructions and hints
in this manual will give you a quick and easy start, and you will soon note how nice it is
to use the Metos equipment.
All rights are reserved for technical changes.
You willfind the main technical data on therating plate fixed to theequipment. When you
need service or technical help, please let us know the serial number shown on the rating
plate. This will make it easier to provide you with correct service.
For your convenience, space is provided below for you to record your local Metos service
contact information.
METOS TEAM
Metos service phone number:...............................................................................................
Contact person:....................................................................................................................

5.10.2004 Rev. 1.0
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5.10.2004 Rev.
1
1. General .......................................................................................................... 1
1.1 Symbols used in the manual .......................................................................................... 1
1.2 Symbols used on the appliance ...................................................................................... 1
1.3 Checking the relation of the appliance and the manual ................................................. 1
2. Safety .............................................................................................................. 2
2.1 Safe use of the appliance ............................................................................................... 2
3. Functional description .................................................................................. 3
3.1 Application of the appliance .......................................................................................... 3
4. Operation instructions ................................................................................. 4
4.1 Operation procedures ..................................................................................................... 4
4.2 After use ........................................................................................................................ 7
4.2.1 Cleaning ................................................................................................................ 7
4.2.2 Lubrication and Maintenance ................................................................................ 8
5. Installation ..................................................................................................... 9
5.1 Installation ..................................................................................................................... 9
6. Service .......................................................................................................... 10
6.1 Service instructions ..................................................................................................... 10
6.1.1 Lubrication and Maintenance .............................................................................. 15
7. Spare parts .................................................................................................. 17
7.1 Voltage codes .............................................................................................................. 19
7.2 Product codes ............................................................................................................... 19
8. Technical specifications .............................................................................. 47

5.10.2004 Rev.
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5.10.2004 Rev. 1.0
General
1
1. General
Carefully read the instructions in this manual as they contain important information re-
garding proper, efficient and safe installation, use and maintenance of the appliance.
Keep this manual in a safe place for eventual use by other operators of the appliance.
The installation of this appliance must be carried out in accordance with the manufactur-
er’s instructions and following local regulations. The connection of the appliance to the
electric supply must be carried out by qualified persons only.
Persons using this appliance should be specifically trained in its operation.
Switch off the appliance in the case of failure or malfunction. The periodical function
checks requested in the manual must be carried out according to the instructions. Have the
appliance serviced by a technically qualified person authorized by the manufacturer and
using original spare parts.
Not complying with the above may put the safety of the appliance in danger.
1.1 Symbols used in the manual
This symbol informs about a situation where a safety risk might be at hand. Given instruc-
tions are mandatory in order to prevent injury.
This symbol informs about the right way to perform in order to prevent bad results, appli-
ance damages or hazardous situations.
This symbol informs about recommendations and hints that help to get the best perform-
ance out of the appliance.
1.2 Symbols used on the appliance
This symbol on a part informs about electrical terminals behind the part. The removal of
the part must be carried out by qualified persons only.
1.3 Checking the relation of the appliance and the manual
The rating plate of the appliance indicates the serial number of the appliance. If the man-
uals are missing, it is possible to order new ones from the manufacturer or the local rep-
resentative. When ordering new manuals it is essential to quote the serial number shown
on the rating plate.

5.10.2004 Rev. 1.0
Safety
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2. Safety
2.1 Safe use of the appliance
Check that the bowl is in working position before starting the mixer.
Do not put your fingers in the bowl while the mixer is running.
To the attachment drive must be connected original attachments only.

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Functional description
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3. Functional description
3.1 Application of the appliance
The mixer is meant for producing masses and doughs which will not release reactions or
liberate material which can harm the user.

5.10.2004 Rev. 1.0
Operation instructions
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4. Operation instructions
4.1 Operation procedures
Place the bowl in the bowl arms. Ensure that the bowl is placed correctly.
Place the mixingtool in the bayonet shaft. The pinof the tool must be turned into the bay-
onet hole.

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Operation instructions
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Raise the bowl to working position by pulling the handle forward.Ensure that the bowl is
placed correctly while the bowl is lifted.
If the mixer is equipped with a timer, set the mixing time by turning the timer to the right.
The mixer will stop automatically, when the time runs out. Set the timer on HOLD when
not used, as otherwise the mixer will not start.
Start the mixer by pressing the green start button >START<.
The mixer must only be started when the bowl is in working position and safety guard, if
mounted, is closed.

5.10.2004 Rev. 1.0
Operation instructions
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Push the speed selector lever to obtain the required speed.
The speed must be changed only when the mixer is running.
Recommended maximum speeds
Before the mixer is stopped, the speed selectorlever should be moved to the lowest speed.
The mixer must not be started when loaded in high speed position.

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Operation instructions
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Stop the mixer by pressing the red stop button >STOP<.
Take care not to overload the mixer.Tough and heavy doughs might reduce the working
capacity of the mixer by 75%. The capacity willbe further reduced if the speed of the tool
is increased beyond what is recommended or if a wrong tool is used. Big lumps of grease
or cooled ingfidients must be divided into fine particles before placed into the bowl. A
long period of overloading will make the thermal overload relay stop the mixer. Let the
mixer rest for approx. 3 minutes and press the red stop button before pressing the green
start button.
Please mind the following ingredients capacities not to overload the mixer:
The AR figure is stating the percentage of liquid in the solids, i.e. a high figure will result
in a light dough and a low figure will result in a heavy dough.
If the mixer is stopped in high speed when loaded, the bowl is to be removed from the
mixer and the speed set to low speed before the bowl is placed in the mixer again.
4.2 After use
4.2.1 Cleaning
The mixer should be cleaned daily or after use. Wash by means of a soft brush and pure
water. Synthetic detergents should be used with care, as they destroy the lubricants of the
mixer.
Washing with a hose is not recommended.
Bowls and mixing tools should be washed in detergents which do not attack aluminum.
Consult suppliers for the right type of detergents.
Egg white 1L=30eggs 2 L
Whipped cream 4 L
Mayonnaise (L Oil) 9 L
Mashed potatoes 10 kg
Biscuit bottom 8-10
Dough L liquid AR 60% 3.75 L
Dough L liquid AR 50% 2.0 L
Dough L liquid AR 40% 1.25 L
Sponge cake 12 kg

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Operation instructions
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4.2.2 Lubrication and Maintenance
When the mixer is used regularly, the varispeed system must be lubricated approx. once
per month.
When the mixer is used intensively or often used without changes in speed ,the lubrication
intervals should be shortened.

5.10.2004 Rev. 1.0
Installation
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5. Installation
5.1 Installation
The mixer can be placed direct on the floor. Foundation bolts in the floor are only neces-
sary under special conditions, e.g. in ships. If the 20 L mixer is placed on a bench stand,
it must be fastened with the enclosed bolts.
If the floor isnot level, the position ofthemixer can be corrected by loosening the screws
placed at the bottom of the outer left side of the mixer, whereafter the legs can be turned.
When the mixer is placed corrrecly, the screws are tightened again.
Ensure that the voltage, phase and hertz printed on the identification plate of the mixer
are correct compared with that of the place of installation.
The identification plate is located at the top of the right side of the mixer.
Be sure the mixer is properly connected to the incoming power supply and that the ground
or earth connection is made.
If the mixer is provided with a five core cable, the mixer must also be connected to 0.
The arrow on the front of the planetary head is showing the direction of rotation of the
planetary head.
On 3-phase motors the direction of rotation can be changed by interchanging 2 phases of
the connecting cable or of the motor.

5.10.2004 Rev. 1.0
Service
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6. Service
6.1 Service instructions
Before servicing the mixer must be disconnected
Remove the top cover 1of the mixer and the plastic cover 43 by removing the two screws
2.
The attachment engagement hub 3 is taken out by removing the plastic cover 4 and the
four bolts 5.
The control box 6 is taken off by removing the two screws 55.

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Service
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The special V-belt 7 is exchanged in the following way:
• remove the top cover 1 of the mixer and the plastic cover 43
• press the speed selector lever 8 back towards the back of the mixerso that the spe-
cial V-belt is loosened, and take off the special V-belt
• the special V-belt is mounted by first placing it on the rear pulley set 9 (the motor
pulley set) and open the pulleys by pulling the special V-belt
• turn the speed selector lever 8 back towards the back of the mixer (high speed)
and mount the special V-belt on the front pulley set 10.
• adjust the speed
The motor pulley 9 set is taken off in the following way:
• remove the top cover 1 of the mixer, the plastic cover 43 and the special V-belt 7
• the motor pulley set can now be taken off by loosening the two screws 40
• the upper half of the pulley set can be taken off by removing the circlip 41
The legs 17 of the mixer are taken off by removing the screws 18.
Relay and thermal 21 overload relay are taken out in the following way:
• remove the top cover 1, the plastic cover 43, the special V-belt 7,and the control
box 6
• the screws 22 are loosened
• if the relay is to be exchanged, the screw 57 is removed
Before relay and thermal overload relay are taken out, the mixer must for safety reasons
be disconnected on the main switch, or the connecting cable disconnected.
The indicator 23 on the side of the thermal over-
load relay is adjusted to the rated current of the
motor +10%.
The motor 42 is taken out in the following way:
• the voltage to the mixer is switched off or the connecting cable disconnected
• remove the top cover 1of the mixer, the plastic cover 43, the special V-belt, and
the motor pulley set 9
• the motor cable is removed from the connecting box 44 of the motor
• put down the mixer on its back
• take off the legs 17 and the bottom plate 19
• by removing the four bolts 16 the motor can be pulled out backwards
The planetary head 24 is taken off in the following way:

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Service
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• the top cover 1 of the mixer, the attachment engagement hub 3, the special V-belt
7, and the control box 6 are removed
• the plastic ring 26 can be taken off by knocking it gently on the front edge, and
then press a screwdriver in between the plastic ring and the metal plate at the top
of the plastic ring
• take off the rubber ring 27
• the stainless headcap 28 can now be taken off by knocking it gently on the front
edge with a plastic hammer, turn the planetary head 180 degree, and knock again
gently on the front edge.
• if only the lower part of the planetary head is to be repaired, the planetary head
can be separated by removing the three bolts 29
• take off the grease nipple andwasher 30 and put off the upper half of the pulley set
31 with an extractor
• take off the movable part 32 of the pulley set
• take off the four screws 33
• the spring 34 is taken off as follows: the nuts 11 and 12 are removed. The lower
fork 15, the toothed rack 35 and the spring 34 will come up too when the nut 12 is
removed. If the toothed rack 35 is to be exchanged, this can be done now when the
lower fork 15 is free. Take out the bolt 38 and the toothed rack can be exchanged.
• the counter nut and the pointed screw 36 are removed, whereafter the speed selec-
tor lever 8 can be taken out
• take off the pin bolt 37 by loosening the counter nut
• by loosening and taking out the four bolts 25, the planetary head can be lowered.
•
Mounting of the planetary head 24 should be done in reverse order:

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Service
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When the lower fork 15 and the spring 34 are
mounted, the speed selector lever 8 is turned
counter clockwise, so that it points horizontally
backwards, at the same time as the lower fork is
pressed gently down. When the speed selector
lever 8 is now turned clockwise, it will catch the
toothed rack 35 and pull down the lower fork.
Screw on the nuts 11 and 12.
Be aware that the pin 39 on the lower part 32 of
the pulley set is to be placed as shown in the
above mentioned drawing.
When everything has been mounted, the speed has to be adjusted.
Adjustment of speed:
• control and if necessary adjust the distance B=318+/-3mm, by loosening the four
bolts 16 and move the motor backwards and forwards. The tolerance of the dis-
tance B can be used in cases when there are problems in adjusting the speed cor-
rectly, as the distance B is dependent on the tolerance of the special V-belt
• the counter nut 11 and the adjusting nut 12 are loosened
• start the mixer and adjust the lowest speed so that the special V-belt 7 is approx.
1-2mm C from the pulley edge
• stop the mixer and tighten loosely the adjusting nut 12, and thereafter the counter
nut 11
• the counter nut 13 and the adjusting screw 14 are loosened
• start the mixer and adjust the highest speed so that the special V-belt 7 is approx.
1-2mm C from the pulley edge of the motor pulley set 9
• stop the mixer and tighten loosely the adjusting screw 14, and thereafter the coun-
ter nut 13

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Service
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• start the mixer and control the measure C on both pulley sets at high and low speed
resp.
• be aware that the pin 39 0n the lower part 32 of the pulley set is to be placed as
shown on the drawing opposite.
Tolerances in the transmission can cause that the special V-belt 7 is hitting the pins of the
pulley sets when thespeed has been adjusted.In these cases thedistance B is to bereduced
and the speed to be adjusted again.
Bowl arms 45 are to be exchange in the following way:
• a) disconnect the mixer on the main switch or disconnect the connecting cable
• b) lower the bowl arms
• c) put the mixer down on its back and take off the legs of the mixer 17 by removing
the screws 18
• d) the bottom plate 19 is taken off by removing the nuts 20
• e) take out the cutter pin 51 securing the lifting bolt 46 and the lifting nut 47
• f) take out the lifting bolt 46 and the lifting nut 47
• g) the two circlips 48 are removed from the two bowl arm guide rods 49 whereafter
thebowl guide rods 49 can be knocked back so that the bowl arms are free and can
be taken out
The lifting lever 50 is exchanged in the following way:
• a) start as described above from a) to f) incl.
• g) the crank shaft 52 is taken off by removing thecirclip 56
• h) ensure that the key 53 ha sbeen removed too
• i) the lifting lever 50 can now be taken out