Metos WD-90GR FLEX User manual

POTWASHER WITH GRANULATE
WD-90GR FLEX & WD-90GR HC
(translation of the original documentation)
Service manual
S/N: Valid from: 15. 05. 2011 Rev.: 2.0
4246124, 4246125

WD-90GR Rev.
1. Safety instructions ........................................................................... 1
1.1 General information ......................................................................................... 1
1.2 Transport .......................................................................................................... 1
1.3 Installation ........................................................................................................ 2
1.4 Detergent and drying agent ............................................................................. 2
1.5 Operation ......................................................................................................... 2
1.5.1 Hot water .................................................................................................. 2
1.5.2 Crushing risk ............................................................................................. 2
1.5.3 Risk of slipping .......................................................................................... 2
1.6 Cleaning ........................................................................................................... 3
1.6.1 Pressure washing ..................................................................................... 3
1.6.2 The outside of the machine ...................................................................... 3
1.6.3 Cleaning the floor ...................................................................................... 3
1.7 Repairing and servicing the dishwasher .......................................................... 4
1.7.1 Safety instructions if the machine is not functioning ................................. 4
1.8 Recycling the machine ..................................................................................... 4
2. Operational description ................................................................... 5
2.1 General information ......................................................................................... 5
2.2 Design .............................................................................................................. 6
2.3 Control panel .................................................................................................... 8
2.4 Operating principle ......................................................................................... 10
2.4.1 Starting the machine ............................................................................... 10
2.4.2 Filling the chemical wash tank ................................................................ 10
2.4.3 Heating the tank ...................................................................................... 10
2.4.4 Wash phase ............................................................................................ 10
2.4.5 Wash cycle for programmes P1, P2 and P3 ........................................... 12
2.4.6 Wash cycle for programmes P4, P5 and P6 ........................................... 12
2.4.7 Guaranteed final rinse ............................................................................ 12
2.5 Controlling the washing process .................................................................... 13
2.6 Display messages .......................................................................................... 13

WD-90GR Rev.
3. Adjustment instructions ................................................................ 14
3.1 Diagnostics function ....................................................................................... 14
3.2 Activating and using the diagnostics function ................................................ 15
3.2.1 REFERENCE VALUES .......................................................................... 16
3.2.2 Other information from the diagnostics system ...................................... 18
3.2.3 DIAGNOSIS ............................................................................................ 18
3.2.4 RELAY TEST .......................................................................................... 18
3.2.5 STATISTICS ........................................................................................... 18
3.2.6 TIME & DATE ......................................................................................... 18
3.2.7 LANGUAGE ............................................................................................ 19
3.2.8 OTHER ................................................................................................... 19
3.2.9 Resetting the filling memory ................................................................... 19
3.3 Setting up the frequency converter ................................................................ 20
3.3.1 Checking and setting the reference values ............................................. 21
3.3.2 Alarm codes frequency converter ........................................................... 22
3.3.3 Changing the frequency converter .......................................................... 22
4. Service ............................................................................................ 23
4.1 Repairs and machine maintenance ............................................................... 23
4.1.1 Periodic maintenance ............................................................................. 23
4.1.2 Machine damage .................................................................................... 23
4.2 Drive motor .................................................................................................... 24
4.2.1 Assembly ................................................................................................ 24
4.2.2 Service .................................................................................................... 24
5. Troubleshooting ............................................................................. 25
5.1 General information ....................................................................................... 25
5.2 Troubleshooting ............................................................................................. 26
5.3 Error messages .............................................................................................. 30

WD-90GR Rev. 2.0 (20110515)
Safety instructions
1
1. Safety instructions
1.1 General information
The machine is CE marked, which means that it complies with the requirements
of the EU machinery directive with regard to product safety. Product safety means
that the design of the machine will prevent personal injury or damage to property.
Modifying the equipment without the approval of the manufacturer invalidates the
manufacturer’s product liability.
To further improve safety during installation, operation and servicing, the operator
and the personnel responsible for installing and servicing the machine should
read the safety instructions carefully.
Switch off the machine immediately in the event of a fault or malfunction. The ma-
chine must only be serviced by trained engineers. The regular checks described
in the manual must be carried out in accordance with the instructions. The ma-
chine must be serviced by a person authorised to do so by the manufacturer. Use
original spare parts. Contact an authorised service company to draw up a pro-
gramme of preventative maintenance. Dangerous situations may arise if the in-
structions above are not followed.
Before using the machine, ensure that personnel are given the necessary training
in operating and maintaining the machine.
1.2 Transport
Handle the machine with care during unloading and transport to avoid the risk of
it tipping over. Never lift or move the machine without using the wooden packag-
ing to support the stand.

WD-90GR Rev. 2.0 (20110515)
Safety instructions
2
1.3 Installation
This symbol on a component is a warning of electrical equipment. The machine
is sensitive to electrostatic discharge (ESD), which is why a static electricity wrist-
band must be used when handling the electronics.
Water and steam pipes must only be connected by authorised personnel.
Water pipes must be connected in a way that complies with the current regula-
tions of the local water supply authority. Check that the water and steam connec-
tions are tight before operating the machine.
Make sure that the mains voltage is the same as that indicated on the machine's
rating plate. The machine should be connected to a lockable mains switch.
1.4 Detergent and drying agent
Only detergent and drying agent intended for industrial dishwashing machines
must be used. Ordinary washing-up liquid must not be used in the machine or for
soaking. Contact your detergent supplier regarding the choice of a suitable deter-
gent.
Be aware of the risk of handling washing and drying agents. Protective gloves and
safety glasses should be used when handling dishwasher detergent. Read the
warning text on the detergent and drying agent containers as well as the deter-
gent supplier's regulations.
1.5 Operation
1.5.1 Hot water
The temperature of the wash and rinse water is 58°C and 85°C. Do not open the
door until the wash and rinse phases have finished.
1.5.2 Crushing risk
Take care when opening and closing the door as there is a risk of body parts be-
ing crushed between the door and the tank, and at the top of the machine be-
tween the door and the cover plate.
1.5.3 Risk of slipping
In order to prevent the risk of people slipping if granulate has been spilled on the
floor, this must be regularly swept up. Keep the floor dry and mop up any water
which has been spilled.

WD-90GR Rev. 2.0 (20110515)
Safety instructions
3
1.6 Cleaning
The temperature of the water in the tank is approx. 58°C and contains detergent.
Be careful when draining and cleaning the tank. Use protective gloves.
1.6.1 Pressure washing
The machine must not be cleaned with a pressure washer. If pressurised water is
directed at the electrical cabinet, the water may penetrate the cabinet and dam-
age the electrical equipment, which may affect the safety of the machine.
In order to satisfy current requirements, electrical components of approved enclo-
sure classes are used. There is no enclosure class capable of withstanding high
pressure.
1.6.2 The outside of the machine
Pressure washers and hoses must not be used to wash the outside of the ma-
chine. Water can penetrate into the electrical cabinet and the control panel and
damage the equipment, which may affect the safety of the machine.
1.6.3 Cleaning the floor
When the floor is being cleaned using a pressure washer, water can splash up
under the machine and damage the components. These have not been designed
to withstand being washed with water. Never use a pressure washer to clean the
floor within 1 metre of the dishwasher without the special protective covers that
are available to prevent splashing. Problems with splashing can also occur when
using ordinary hoses.

WD-90GR Rev. 2.0 (20110515)
Safety instructions
4
1.7 Repairing and servicing the dishwasher
Disconnect the power supply before opening the electrical cabinet. Avoid touch-
ing hot pipes and the booster heater.
1.7.1 Safety instructions if the machine is not functioning
Check the following:
• Has the machine been used according to the instructions?
• Are all the removable parts in the correct place?
• Is the mains switch in the ON position?
• Are the fuses in the electrical cabinet undamaged? Ask the service person-
nel to check the fuses.
If this does not solve the problem, ask authorised service personnel to check the
machine.
1.8 Recycling the machine
When the dishwasher has reached the end of its service life, it must be recycled
in accordance with current regulations. Contact professionals who specialise in
recycling.

WD-90GR Rev. 2.0 (20110515)
Operational description
5
2. Operational description
2.1 General information
The WD-90GR FLEX / WD-90GR HC is a potwasher with granulate primarily in-
tended for washing heavily soiled items which are used for preparing and storing
food.
The machine comes as standard with electric heating but is also available with
steam heating.
The items to be washed can be placed in the cassette which is pulled out through
the door. It is also possible to use two trolleys and two cassettes in order to use
the full capacity of the machine. If a sorting bench is used for scraping off food
residues, the efficiency of the dishwasher can be increased even further.
The cassette is designed to hold items which are the same size as gastronorm
containers. There is a range of accessories for washing other types of items.
The plastic granulate in the washing water subjects the items to a mechanical
cleaning process.
1. Dishwasher
2. Sorting bench
3. Trolley
4. Trolley for dirty items
5. Trolley for clean items
90_02
3
54
1
12

WD-90GR Rev. 2.0 (20110515)
Operational description
6
2.2 Design
The machine is manufactured entirely from non-corrosive materials. The bottom
frame has adjustable feet and attachments for pumps.
The electrical cabinet is at the top edge of the machine and the incoming compo-
nents are clearly labelled. The position of the cabinet helps to prevent water from
penetrating.
The entire machine is insulated against noise and heat and the housing of the ma-
chine is made of polished sheet metal.
The machine’s design
90_03