First Choice Metos MM-5 User manual

SPARE PARTS DIAGRAM FOR
First Choice Group
Blakeney Way, Kingswood Lakeside
Cannock, Staffs, WS11 8LD
TEL: [phone] FAX: [phone]
Email: [email protected]
Web: www.firstchoice-cs.co.uk
Dishwasher
MM-5 / MM-5A
(Valid from 2003)

DISHWASHER
INSULATED MODEL
TYPE: MM5, MM5A
Accessories
BOOSTER PUMP
DRAIN PUMP
DETERGENT DISPENSER
Service Manual
S/N: Rev.: 2.4

25.3.2003 Rev. 2.4
Dear Customer,
Congratulations on deciding to choose a Metos equipment for your kitchen activities. You
made an excellent choice. We will do our best to make also you a satisfied Metos custom-
er like thousands and thousands of others all over the world.
Please read this manual carefully. You will learn many right, safe and efficient working
methods in order to get the best possible benefit from the equipment. The instructions and
hints in this manual will give you a quick and easy start in using this equipment. You will
note very quickly how nice it is to use the Metos equipment.
All rights are reserved for technical changes.
You will find all the main technical data on the rating plate fixed to the equipment. When
you need service or technical help, please let us know the serial number of the equipment.
This will make it easier to provide you with the correct service. Please write the contact
information of your local Metos service in advance on the lines below.
METOS TEAM
Metos service phone number:...............................................................................................
Contact person:....................................................................................................................

25.3.2003 Rev.
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 Safety instructions in case of malfunction ..................................................................... 2
2.2 Disposal of the appliance ............................................................................................... 2
2.3 Installation ..................................................................................................................... 2
2.4 Detergent and rinse aid .................................................................................................. 2
2.5 Washing and cleaning of the machine ........................................................................... 3
2.5.1 High pressure cleaning of the dishwasher ............................................................. 3
2.5.2 Inside of the machine ............................................................................................. 3
2.5.3 Outside of the machine .......................................................................................... 3
2.6 Floors ............................................................................................................................. 3
2.7 Repairs and maintenance of the machine ...................................................................... 3
3. Functional Description ................................................................................. 4
3.1 Application of the appliance .......................................................................................... 4
3.1.1 Prohibited use/Use for other purposes ................................................................... 4
3.2 Construction [MM5] ...................................................................................................... 4
3.2.1 Operating switches and signal lights ..................................................................... 5
4. Operation ....................................................................................................... 6
4.1 General .......................................................................................................................... 6
4.2 Operation procedures ..................................................................................................... 6
4.2.1 To fill with water [MM5] ....................................................................................... 6
4.2.2 Washing [MM5] .................................................................................................... 6
4.2.3 Hygiene warranty [MM5] ...................................................................................... 7
4.3 After operation ............................................................................................................... 7
4.3.1 Emptying, internal machine rinse [MM5] ............................................................. 7
5. Installation ..................................................................................................... 8
5.1 General .......................................................................................................................... 8
5.2 Operating conditions ..................................................................................................... 8
5.2.1 Lighting .................................................................................................................. 8
5.2.2 Ventilation ............................................................................................................. 8
5.3 Installation procedures ................................................................................................... 8
5.3.1 Electrical connections ............................................................................................ 8

25.3.2003 Rev.
5.3.2 Water connections [MM5] ..................................................................................... 8
5.3.3 Drain connection [MM5] ....................................................................................... 9
5.4 After installation ............................................................................................................ 9
5.4.1 First-run ............................................................................................................... 10
5.5 Staff training ................................................................................................................ 10
6. Adjustment instructions ............................................................................. 11
6.1 Setting the rinse aid dosing pump ............................................................................... 11
6.2 Setting the detergent dispenser [MM5] ....................................................................... 12
6.2.1 Control of the detergent dispensing ..................................................................... 12
6.3 Setting the temperatures [MM5] ................................................................................. 12
6.3.1 Energy saving in stand by period [E/S short circuit piece switched to ON position]
12
6.3.2 Temperature sensors [NTC] ................................................................................. 12
7. Service .......................................................................................................... 13
7.1 Service by authorized personnel .................................................................................. 13
7.1.1 Periodic service .................................................................................................... 13
7.1.2 Annual maintenance ............................................................................................ 13
7.1.3 Control circuit board function description [MM5] .............................................. 14
8. Troubleshooting .......................................................................................... 16
8.1 Temperature alarms [MM5] ........................................................................................ 16
8.2 Error alarms (the signal light of the wash cycle is blinking in the cycle) [MM5] ...... 17
9. Spare parts .................................................................................................. 19
9.1 Voltage codes .............................................................................................................. 21
9.2 Product codes ............................................................................................................... 21
10. Technical specifications ............................................................................ 35

25.3.2003 Rev. 2.4
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 and water 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 case of failure or malfunction. The periodical function checks
requested in the manual must be carried out according to the instructions. Have the appli-
ance 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.

25.3.2003 Rev. 2.4
Safety
2
2. Safety
2.1 Safety instructions in case of malfunction
Check the following:
• Has the appliance been used according to instructions?
• Are all possibly removable parts refitted?
• Is the main switch in the ON position?
• Are the circuit breakers (fuses) of the appliance in the electrical supply central in
working order? Ask an authorized person to check the circuit breakers.
• If this does not help, contact an authorized service person.
2.2 Disposal of the appliance
The disposal of the appliance when its economical lifetime has been reached must be car-
ried out in accordance with local rules and regulations. Contact professional personnel
specializing in recycling.
2.3 Installation
Electrical and water connections must be carried out by authorized personnel only.
Make sure that the mains voltage is the same as that indicated on the data plate of the ap-
pliance. The machine shall be connected to the main switch.
Water connection must be carried out in a manner that complies with the regulations of
the local water supply authority. Check the tightness at the connection point before start-
ing up. See also “Water connections” in Chapter “Installation”.
2.4 Detergent and rinse aid
Only detergent and rinse aid which are ment for dishwashing machines are allowed. Hand
dishwashing detergent must not be used because it results in excessive foam and poor
dishwashing result. Contact your dishwashing detergent supplier for the choice of a suit-
able detergent and rinse aid. Pay attention to the risks involved in the handling of machine
dishwashing detergents and rinse aids (see safety instructions of the detergent).
Protective gloves and coggles should be used when handling machine dishwashing deter-
gent and rinse aid. Read warning text on the detergent and rinse aid container.

25.3.2003 Rev. 2.4
Safety
3
2.5 Washing and cleaning of the machine
The machine performs final rinse with 85° C hot water. The hood must not be opened
until the final rinse is finished.
If the machine is equipped with automatic hood lift be careful not to get steam on your
face when the hood is lifting.
The temperature of the dishwater in the tank is approx. 60° C and mixed with detergent.
Be careful when emptying and cleaning the machine. Use protective gloves.
2.5.1 High pressure cleaning of the dishwasher
High pressure cleaning of the machine is forbidden.
In order to satisfy official requirements concerning the safety standards of Metos dish-
washers, electrical components of approved sealing classes are used.
There is no sealing class capable of withstanding high pressure.
2.5.2 Inside of the machine
Don’t use steelwool and for cleaning of the machine.
Don’t use foaming detergents for cleaning the machine.
2.5.3 Outside of the machine
It is recommended to use a damp cloth only.
2.6 Floors
When rinsing floors, water can splash up under the machine and damage the electrical
components. These have not been designed to withstand rinsing with water. Do not spray
the floor closer than 1 meter from the dishwasher. Special protecting covers are available
for high pressure washers to prevent splash.
NOTE! Splash from underneath can also arise when using ordinary water hoses.
2.7 Repairs and maintenance of the machine
Switch off the power before removing the front panel. Avoid contact with hot pipes and
booster heaters.

25.3.2003 Rev. 2.4
Functional Description
4
3. Functional Description
3.1 Application of the appliance
The machine is intended for washing items used for the preparation and serving of food,
including various types of items used for the storage of food. Washing must therefore be
carried out with a machine dishwashing detergent and rinse aid suitable for this purpose.
3.1.1 Prohibited use/Use for other purposes
Use of the machine for applications other than what it was designed for must always be
checked in advance with the manufacturer.
3.2 Construction [MM5]
1. Strainer box
2. Tank strainer
3. Rinse arm
4. Wash arm
5. Overflow pipe
6. Pump strainer

25.3.2003 Rev. 2.4
Functional Description
5
3.2.1 Operating switches and signal lights
1. On/Off switch
2. Wash program position
(0) only tank filling position
(1) 60 seconds program position
(2) 120 seconds program position
(3) 180 seconds program
3. Cycle indicator light
4. Tank thermometer
5. Boiler thermometer
6. Drain switch (only in types with drain pump)

25.3.2003 Rev. 2.4
Operation
6
4. Operation
4.1 General
Before using the dishwasher, see also “After installation” in Chapter “Installation”.
4.2 Operation procedures
4.2.1 To fill with water [MM5]
• Check that the machine is cleaned and that no soil exists in the nozzles of the wash
and rinse arms.
• Put the overflow pipe and tank strainers in place in the machine. Make sure that
there is detergent and rinse aid in the containers.
• Push the switch 0/I. (Keep the wash program selector in position 0).
• Close the hood. The machine is now automatically filled with water.
• When the tank is filled the machine will automatically heat water.
• Do not begin washing until the machine has reached the correct temperature for
wash 60°C (in display 4).
[Tank filling is controlled by a pressure switch. If the contact tip of the pressure switch
does not close within 6 minutes from the beginning of tank filling, the filling has been ob-
structed or the water flow is too low and the error indication is activated.]
4.2.2 Washing [MM5]
• Place the goods to be washed in the rack. Place the dishes correctly in the rack:
deep plates in the rack for deep plates, cups in the cup racks etc. Rinse with a hand
sprayer to remove large food scraps.
• Select the desired washing time using the selector (2).
• Lower the hood. The wash cycle will automatically begin. The cycle will be indi-
cated by the indicator light (3). If the hood is lifted during the cycle, the machine
stops.
• When the dishes are normally soiled, the dish water should be replaced (emptying-
filling) after approx. 40 washing cycles.

25.3.2003 Rev. 2.4
Operation
7
[Hood lift function (only MM5-SA, demands an auxiluary relay card:
5210804]
• [The booster pump of the hood lift is activated after the end of the wash cycle for
1 second, then it keeps a steam exhaust pause of 3 seconds and after that runs con-
tinuously for 7 seconds.]
Detergent for manual dishwashing must not be used in the machine or for soaking purpos-
es as it builds foam and gives poorer wash results.
4.2.3 Hygiene warranty [MM5]
If the right final rinse temperature has not been reached, the machine goes on washing un-
til the temperature setting value has been reached.
4.3 After operation
4.3.1 Emptying, internal machine rinse [MM5]
• Push the switch I/0 to position ‘0’ and remove the tank strainers. Remove the over-
flow pipe and leave the hood open.
• If the machine is equipped with drain pump push the drain push-button (6) until
the tank is empty
• Clean the overflow pipe and strainers.
• Close the hood, internal rinsing starts. The hood may be opened after approx. 30
sec.
• If the machine is equipped with drain pump push the drain push-button (6) until
the tank is empty
• Check that the tank, wash and rinse nozzles are clean. Leave the hood lifted until
next wash.
• Clean the outside of the machine with damp cloth.
[Drain pump function (option, demands an auxiluary relay card:
5210804)]
• [Is activated in rinsing, in boiler cooling function or by pressing the drain push but-
ton.]
• [Starts after 7 seconds from the beginning of rinsing and runs for 20 seconds, i.e.
the pump has an after run of 10 seconds.]
• [The drain pump also runs when the hood is open or when the alarm is on]
Do not use steel wool when cleaning. Steel wool causes rust on the machine.

25.3.2003 Rev. 2.4
Installation
8
5. Installation
5.1 General
See installation drawing in Chapter “Technical specifications”.
When connecting benches, roller conveyors etc., it is not allowed to make any holes in the
machine!
The 'CE'-mark is only valid for machine in original design.
5.2 Operating conditions
5.2.1 Lighting
In order to ensure the best possible working conditions during the operation of the ma-
chine and during service and maintenance, make sure that the machine is placed in a well-
lit room.
5.2.2 Ventilation
A satisfactory working environment requires ventilation in the dishwashing room. The
recommendation of ventilation is 600m3/h.
5.3 Installation procedures
5.3.1 Electrical connections
See details in the drawings of installation instructions and technical specifications tables.
The electrical supply for the machine has to be equipped with circuit breaker. The length
of supply cable has to be such that the machine can be easily moved for the service.
The electrical circuit drawing is inside of the machine, behind the front panel.
5.3.2 Water connections [MM5]
See the installation drawing and technical specifications.

25.3.2003 Rev. 2.4
Installation
9
Make sure that the machine stands horizontally. Adjust, if necessary, with the aid of the
legs of the machine. Connect the warm water. The connection shall be equipped with a
stop cock, vacuum valve and non-return valve.
5.3.3 Drain connection [MM5]
See the installation drawing and technical specifications.
Connect the drain tube to the union elbow which is located under the tank, so that the wa-
ter can flow out freely.
If it is not possible to let water flow freely to the drain, one have to use a drain pump.
A machine with a drain pump is connected to a basin in a pre-wash table or into a drain
pipe over the water lock.
The connection can be located at aheight of max. 0,8 m from the bottom of the machine.
It is not allowed to lengthen the drain hose.
5.4 After installation
See also Chapter “Operation”
Check the following points before using the machine
• the dishwasher has been installed horizontally according to the installation in-
structions.
• all the connections (electricity, water) are tight and correctly made.
0,8
NOTE:
If the machine is not equipped with 
the drain pump, the drain water is 
conveyed straight to the floor drain.
The drain water pipe must be 
installed so that it ends above the 
water level in the water drain.

25.3.2003 Rev. 2.4
Installation
10
5.4.1 First-run
Preparations
Check that the strainers and the overflow pipe are in their correct positions. Check also
that the detergent and rinse aid hoses are connected to their respective containers. The
thicker hose is connected to the detergent container. Open the stop cock.
Rotation direction of the pump motor
The rotation direction can be seen by checking the shaft between the pump and motor,
while the contactor is pressed for a short time. If the motor does not rotate in the direction
indicated by the rotation arrow, alter two of the incoming phases.
Temperatures
When the dishwasher is in operation, the washing temperature should be approx. 60-65°C
and the rinsing temperature approx. 80-85°C.
Controlling the hood magnetic switch
Check that themagnetic switch stops the machine during both the wash and rinse cycle
when the hood is lifted.
5.5 Staff training
Before the machine is used make sure that the personnel receive the requisite information
for handling and maintenance!

25.3.2003 Rev. 2.4
Adjustment instructions
11
6. Adjustment instructions
6.1 Setting the rinse aid dosing pump
1. Rinse aid container
2. Adjusting screw of the rinse aid dispenser
3. Boiler
4. Rinse
• Set the thinner hose into the rinse aid container.
• Check that the adjusting screw on the pump is completely opened.
• Pump so much rinse aid that it reaches the pump (pumping is carried out by press-
ing the adjusting screw in and out). Pump after this 10-15 times.
• Adjust the quantity of rinse aid by turning the adjusting screw. The basic setting is
about 10 cm measured from the pipe. The amount of rinse aid can be regulated be-
tween 0...4 cm3, which is equivalent to 0...30 cm drawn into the suction tube. The
amount of rinse aid can be reduced by screwing clockwise and increased by screw-
ing counter clockwise.

25.3.2003 Rev. 2.4
Adjustment instructions
12
6.2 Setting the detergent dispenser [MM5]
The detergent dispenser is adjusted by turning the pump setting screw to position 6. After
that the potentiometer TR 3 on the relay card is adjusted so that the air bubble in the hose
moves 10-12 cm. The detergent supplier adjusts the pump for the valid detergent.
6.2.1 Control of the detergent dispensing
• When the wash pump runs the setting area is 0...30 seconds.
• During tank filling, the detergent dispensing will automatically become four time
longer, i.e. 0-->120 seconds.
• When the hood is up, the function of the pump is prevented.
6.3 Setting the temperatures [MM5]
The tank and boiler temperatures are adjusted on the relay card. The boiler setting value
is adjusted with potentiometer TR2 and the tank temperature is adjusted with the potenti-
ometer TR1. The boiler setting value is 85 degrees (Norway 93). The tank setting is 62
degrees.
6.3.1 Energy saving in stand by period [E/S short circuit piece switched to ON position]
• 1 min program is chosen; the boiler temperature 10°C below the setting value
• 2 min program is chosen; the boiler temperature 20°C below the setting value
• 3 min program is chosen; the boiler temperature 30°C below the setting value
6.3.2 Temperature sensors [NTC]
• Alarm, if the sensor is in short circuit, broken or if the temperature is below 0°C /
over 125°C

25.3.2003 Rev. 2.4
Service
13
7. Service
7.1 Service by authorized personnel
7.1.1 Periodic service
The rubber hose on the pump’s pressure side should be replaced at least every five years.
The hoses for detergent and rinse aid should be replaced at least every second year.
7.1.2 Annual maintenance
Annual maintenance should be accomplished in accordance with the following list:
Steps carried out will be marked:
• che = check
• cha =change
• a =adjust
• m =measure
• c =cleaning
•t=tighten
•f=fix
Check record: middle and basic service (service time; middleserv. 2h, basic serv. 3,5h)
Work order No.___________________________
Service - ID______________________________
Equipment model__________________________
Item Middle
service
Basic
service
1. Installation and framework check / adjustment che / a che / a
2. Contactors and other electrical components check / connections tightened c / t c / t
3. Door and hinge check / adjustment che / a che / a
4. Door sprigs check / change che cha
5. Temperatures check / adjustment che / a che / a
6. Solenoid valves clean / fix or change c f / cha
7. Signal lights check / change che / cha che / cha
8. Strainers and filters cleaning c c

25.3.2003 Rev. 2.4
Service
14
7.1.3 Control circuit board function description [MM5]
Connections on the control circuit board:
Normal voltage connections:
Low voltage connections:
Adjustments: Rinse and tank temperatures and detergent dosing time can be adjusted with
the 3 potentiometres on the control circuit board.
9. Wash and rinse time check / adjustment che / a che / a
10. Wash and rinse dispenser check c c
11. Wash pump check (pump change in every second basic service) che cha
12. Wash and rinse arms / nozzles check / cleaning che / c che / c
13. Casing tubes, pockets and electrodes cleaning c c
14. Power feed measurement (all phases, neutral and ground) m m
15. Heating elements and motors mega-test measurement m m
16. Heating elements and motors resistance / current measurement m m
17. Heating elements sealing change cha cha
18. Water hoses check / change che cha
19. Water pressure measurement m m
20. Water leaks check and fix che / f che / f
Item Middle
service
Basic
service
PPG Program selector. Choice of wash programs 1min, 2 min or 3 min
PR Wash tank pressure switch
MPM Hood limit switch
IG Control switch
SONDA VASCA Tank sensor
SONDA BOILER Boiler sensor
TLB Boiler contactor: 250V~ 16A
TLV Tank contactor: 250V~ 16A
TLP Wash pump contactor: 250V~ 16A
ELC Rinse/fill solenoid valve: 250V~ 16A. Heating is not on during the fill or rinse cycle
PS Drain pump (option) : 250V~ 10A. Drain pump is running only during the rinse cycle.
SC Program signal light: 12V 1W is activated during the program cycle.
TR2 Rinse water temperature adjustment:Temperature is adjustable between 60°C and
90°C
TR1 Tank temperature adjustment: Temperature is adjustable between 4°C and 70°C
TR3 Detergent dosing time adjustment: Dosing is adjustable from 0 to 120 seconds dur-
ing filling and from 0 to 30 seconds in the following wash cycles
E/S Energy saving function: choice with separate short-circuit piece. Energy saving
function keeps the boiler temperature 20°C lower during the stand-by function.

25.3.2003 Rev. 2.4
Service
15
Wash programs:
TSTOP Wash program temperature control: choise with separate short-circuit piece. Wash
program with temperature control: When the temperature control has been chosen
the wash pump runs until the set value of the rinse temperature is reached. After
this the program continues normally to the rinse.
Wash Wash pump is activated according to the selected wash program or if the TSOP
is selected until the rinse temperature has reached the set value. Detergent dos-
ing pump control is activated when the wash pump is running.
Stand-by func-
tion
There is a “dropping time” of 3 seconds between the wash and rinse cycles.
Rinse The rinse cycle takes 17 seconds. The drain pump runs during the rinse cycle
if the machine is equipped with it.
End of program The wash program signal light goes off to indicate the end of the wash program
cycle.