Washtech 3 Series User manual

M1 Series 3
PASSTHROUGH DISHWASHER
ServiceManual

WARNING
Before installation and commissioning, you must read the safety instructions and
warnings carefully and all the warning labels attached to the equipment.
IMPORTANT
Failure to comply (even partially) with the instructions given in this manual will
invalidate the product warranty and relieves the manufacturer of any responsibility.
IMPORTANT
The alteration of machine operation, design or the replacement of parts not
approved by the manufacturer may void warranties and approvals.
We have checked that the contents of this document correspond to the model described. There may be
discrepancies nevertheless, and no guarantee can be given that they are completely identical. The information
contained in this document is reviewed regularly and any necessary changes will be included in the next
edition. We welcome suggestions for improvement.
Document subject to change without prior notice.
Information supplied in this manual is copyright. No part of this work may be reproduced or copied in any
form or by any means, electronic or mechanical without the express permission of the author / publisher.
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Service Manual M1-3 (W) 2 Revision 1B

Contents
Safety Instructions ...........................................................................................................................................................................4
Installation ...........................................................................................................................................................................................5
Installation Diagram ............................................................................................................6
Bench Work Details ............................................................................................................7
Operating Instructions..................................................................................................................................................................8
Dishwashing Procedures .............................................................................................................................................................9
Troubleshooting Chart............................................................................................................................................................... 11
Components .................................................................................................................................................................................... 13
Location and Access..........................................................................................................13
Timer....................................................................................................................................14
Rinse Thermostat...............................................................................................................15
Wash Thermostat...............................................................................................................16
Solenoid Valve....................................................................................................................17
Pressure Switch ..................................................................................................................18
Wash Pump.........................................................................................................................19
Rinse Aid Injector (Optional) ..........................................................................................20
Electrical Diagrams ..................................................................................................................................................................... 21
Schematic Diagram............................................................................................................21
Wiring Diagram..................................................................................................................22
Assembly Diagrams..................................................................................................................................................................... 23
Wiring Tray Assembly.......................................................................................................23
Control Panel Assembly ...................................................................................................24
Wash Assembly ..................................................................................................................25
Rinse Assembly ..................................................................................................................26
Rinse Tank Assembly ........................................................................................................27
Door Link Assembly .........................................................................................................28
Spare Parts ........................................................................................................................................................................................ 29
Accessories ....................................................................................................................................................................................... 31
Appendices....................................................................................................................................................................................... 32
Rinse Aid Injector Retrofit......................................................................................................................... 32
Rinse Pump Retrofit ................................................................................................................................ 33
Detergent Pump Retrofit ........................................................................................................................... 34
Revisions............................................................................................................................................................................................ 35
Service Manual M1-3 (W) 3 Revision 1B

Safety Instructions
WARNING
Equipment contains dangerous voltages and can be hazardous if installed or
operated incorrectly. Non-compliance with Warnings or failure to follow the
instructions contained in this manual can result in loss of life, severe personal
injury or serious damage to property.
Installation
♦Use qualified, skilled personnel
♦Follow installation instructions
♦Connect to correct voltage and supply current
♦Provide fully accessible Electrical Isolation Switch
Training and Supervision
♦Read and Understand the Operating instructions
♦Train all staff
♦This appliance is not intended for use by young children, who must be
supervised to ensure they do not play with the appliance
♦This appliance is not intended for use by infirm persons without supervision
♦This appliance is not intended for use as a stepladder
Hot Surfaces
♦Be aware some surfaces can be hot
Chemicals
♦Commercial dishwashing detergents are hazardous
♦Read and follow the safety information found on the labels of detergent
containers and Material Safety Data Sheets
♦Handle with care
♦Use protective eyewear and clothing if decanting containers
Hot Water
♦Door safety switches are designed for emergency use only
♦Wait for the green cycle light to go out before opening the door
♦Wash water is 60°C and contains caustic detergent so DO NOT put hands
in wash water
Cleaning
♦DO NOT hose down the machine or splash water over the exterior
♦Watch for broken glass etc when cleaning the inside of the machine
Power Cord Replacement
♦If the supply cord is damaged, it must be replaced by the manufacturer or its
service agent or a similar qualified person in order to avoid a hazard
Service Manual M1-3 (W) 4 Revision 1B

Installation
WARNING
Installation personnel must be suitably qualified and ensure compliance with all
codes and standards.
IMPORTANT
Failure to comply (even partially) with the instructions given in this manual will
invalidate the product warranty and relieves the manufacturer of any responsibility.
Install machine on sound waterproof self-draining floor and use adjustable feet to
level machine.
Recommended bench depth = 600 mm, height = 900 mm – see Bench Details
diagram.
In corner installations the front of the machine must face to the left of the corner.
Allow room for detergent to one side of machine or in adjacent cupboard. 20litre
container requires about 450H x 250W x 350D, but smaller containers are available
from many suppliers.
Water Supply Temperature 65°C ± 5°C
Pressure 100-200 KPa (15-30 Psi) with rinse pump
200-400 KPa (30-60 Psi) without rinse pump
Flow rate minimum 20 litres per minute
Consumption 3 litres per cycle approximately
Connection 20 mm (3/4"BSP Male)
IMPORTANT
Installation shall comply with requirements of AS 3500.1.
Flush supply line before connection.
Do not use small diameter plastic supply lines.
Line strainer is recommended.
Booster pump is available option for low pressure.
Pressure limiter is required over 400 KPa
Waste 40 mm – refer point B on the Installation Diagram on the next page. Directly
behind the machine, through knock outs in side panels or through hole in base.
Power Electrical supply required is 15A 240V 50Hz via switched outlet adjacent to
machine, which is supplied with cord set including 15A plug.
Troubleshooting
If the machine doesn’t fill after switching on the power, check and ensure that the
hot water supply tap is open, water supply pressure is not below specification and
Dual Check Valve is not faulty and correctly installed (arrows on the dual check
valve’s body specify water flow direction).
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Service Manual M1-3 (W) 5 Revision 1B

Service Manual M1-3 (W) 6 Revision 1B

Service Manual M1-3 (W) 7 Revision 1B

Operating Instructions
Start up
Fit drain upstand, wash pump filter,
scrap tray and shut door.
Turn wall and machine power
switches on.
Power light glows red and machine
fills automatically.
Wash Ready light glows amber when
wash tank is ready.
Rinse Ready light glows amber when
the machine is up to required
temperature and ready to run.
Operation
Load rack into machine and close
door to start the machine.
Cycle light glows green while
machine operates.
When Cycle light goes out, cycle is
complete.
Open door and remove rack.
After removing rack from
machine, DO NOT shut door as
machine will start up again.
NOTE: Machine will not operate unless Ready lights are on.
Shut down every night
Turn machine and wall power switches off.
Remove drain upstand to drain wash tank.
Remove scrap tray and wash pump filter and rinse clean.
Replace drain upstand, filter and scrap tray.
Service Manual M1-3 (W) 8 Revision 1B

Dishwashing Procedures forbest results
Installation
Read Operator manual. Correct installation, including an adequate supply of water
at the correct temperature and pressure is essential for effective operation of your
machine. Refer installation instructions for details. Water softening is
recommended in hard water areas - especially for glasswashing.
Pre-rinsing
Pre-scraping of dishes is required by Food Hygiene
Regulations. The best method is to pre-rinse with a Fisher
Pre-rinse Unit - or alternatively by scraping or dunking in
water.
Cutlery Procedures
Pre-soak cutlery in warm water, preferably containing cutlery
pre-soak compound - refer your chemical supplier.
Do not overfill cutlery containers. Cutlery should be loose with
handles down. Sort after washing rather than before. Cutlery
of only one type nests together and obscures wash water.
Racking Procedures
Do not overload racks, minimize the overlap
of crockery. Cycle times are short and water
consumption per cycle low - so there is no
advantage in overloading racks.
Cycle Times
For multi-cycle machine use the longest
cycle whenever possible. Note that water
consumption does not increase with
longer cycles. Only choose faster cycles
when necessary.
Detergent
Use of correct type and quantity of detergent is essential to the
performance of the machine. Low foam specialty products are
recommended. We strongly recommend that you use a
professional dishmachine chemical supplier - and will be pleased
to recommend a supplier in your region. Discuss with them the
use of cutlery pre soak solution, detergent and drying agent.
Service Manual M1-3 (W) 9 Revision 1B

Dishwashing Procedures forbest results
Drying
Single tank commercial dishwashers do not have a drying
cycle. However, the machines do rinse at high temperatures
which promote fast drying particularly when drying agents are
used. We recommend prompt removal of the rack from the
machine - leave the rack on the bench for 2 to 3 minutes
before emptying. This time will be reduced with correct use
of drying agent (rinse fluid) which reduces water surface
tension and allows water to drain quickly from wash ware.
For advice on drying agents and injectors refer to your
chemical supplier.
Daily Cleaning
It is essential that the machine is drained and cleaned at the end of each day. Drain
the machine then remove, clean and replace filters as per the operating
instructions. Regularly check the wash and rinse jets and clean them if necessary –
see Regular Cleaning.
Regular Cleaning
1. Remove scrap trays1and wash pump inlet filter2, and
rinse or brush clean.
2. Remove wash and rinse arms by undoing the central
thumbscrews3. Remove the end cap screws4from the
wash arms and the end screws5from the rinse arms and
flush the arms with water. Use a toothpick or paperclip, if
necessary, to clear jets.
Regular Servicing
Regular servicing of the dishwasher is essential to keep the
machine in top working condition and get the best
performance results.
Please contact your Authorised Service Provider to organize
regular servicing of the dishwasher.
Service Manual M1-3 (W) 10 Revision 1B

Troubleshooting Chart
PROBLEM POSSIBLE CAUSES REMEDY (Check/Adjust/Replace)
Heating
Rinse not heating Over-temp thermostat tripped Over-temp thermostat
Rinse thermostat settings or fault Rinse thermostat
Rinse element failed Rinse element
Overheating Thermostat adjustment Thermostat
Thermostat probe out of pocket Insert & secure probe
Wash water cold Wash thermostat setting Wash thermostat
Wash element faulty Wash element
Delays
At start or Rinse element faulty Rinse element
between Water supply cold Supply hot water
cycles Water supply pressure excessive Restrict supply pressure
Rinse cycle too long Timer
Rinse element faulty Rinse element
Leaks
Leak from pumps Seal failure Pump seal
Leak from hoses Hose damage Hoses
Hose clamp loose Hose clamps
Splash from door Wash arm end caps missing End caps
Wash jets blocked Jets
Wash jets missing Jets
Arms not rotating Arms and bushes
Arms not level Arms
Filling
Not filling Fill/rinse solenoid faulty Solenoid valve
Supply valve shut Water supply valve
Rinse lines blocked Rinse pump, solenoid valve filter
Door switch faulty Door switch
Pressure switch faulty Pressure switch
Won't stop filling Solenoid valve faulty Solenoid valve
Pressure switch set too high or
faulty
Pressure switch
Pressure bell or hose damaged Pressure bell or hose
Drainage
Flooding Drain waste blocked Drain waste
Wash Arms
Not rotating Wash jets not clean Wash jets
Arm bushes worn Bushes
Wash pump not working Wash pump
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Troubleshooting Chart
PROBLEM POSSIBLE CAUSES REMEDY (Check/Adjust/Replace)
Rinse Arms
Not rotating Rinse jets not clean Rinse jets
Arm bushes worn Bushes
Water supply pressure low Water supply
Rinse pump not working (if fitted) Rinse pump (if fitted)
Cycle start
Does not start Not up to temperature Give machine reasonable time initially
Rinse thermostat faulty Rinse thermostat
Door switch faulty Door switch
Cycle finish
Rinse doesn’t stop Solenoid jammed open Solenoid valve
Timer stuck Timer
Pressure switch faulty Pressure switch
Wash continues Timer jammed Timer / Timer motors
Noise
Noisy rinse cycle Rinse pump squeals Low pressure / blocked water supply
Noisy wash cycle Wash pump noisy Wash pump including inlet filter
Cycle
Cycle too long Timer faulty Timer / Timer motors
Performance
Poor wash result Detergent not used Use quality low foam product
Detergent pump faulty Detergent pump
Overloading racks Do not overload racks
Not pre-rinsing Use Fisher pre-rinse
Wash arms not rotating Remove and clean arms/check
bushes
Wash jets blocked Remove arms and clean jets
Wash temperature low Check wash heating
Excessive soiling Pre-rinse / use long cycle
Unrealistic expectation E.g. baked on soiling requires pre-
soaking
Poor rinse results Rinse jets blocked Remove arms and clean jets
Rinse arms not turning Remove arms, clean jets, check
bushes
Poor racking procedures Do not overload racks
Excessive wash tank soil build up Pre-rinse, change wash water
regularly
Not drying Poor wash/rinse performance Refer above
Low temperatures Check heating systems
Drying agent not used Use quality drying agent/rinse fluid
Service Manual M1-3 (W) 12 Revision 1B

Components
WARNING
All service/repair work must be carried out by qualified personnel only.
Location and Access
1. Wiring Tray
2. Power/Chemical Terminal
3. Timer
4. Rinse Thermostat
5. Door Switch Relay
6. Test Switch
7. Fill/Heat Contactor
8. Rinse Element
9. Over Temperature Thermostats
10. Fill/Rinse Solenoid with DCV
11. Wash Pump
12. Wash Element
13. Door Switch
14. Pressure Switch
15. Power Switch
16. Cycle Light
17. Rinse Ready Light
18. Wash Ready Light
19. Power Light
Service Manual M1-3 (W) 13 Revision 1B

Timer
Part Number 32661 001
Function Provides an automatic timing sequence of the wash, rinse, detergent and rinse aid injection
stages in a dishwashing cycle.
Description The electro-mechanical timer has five cams and a drive motor. The timer cams, rotated by
the motor, operate individual changeover switches in a set timing sequence. The drive
motor is rated at 120 sec per full turn and it is controlled by cam T1 (the cams are counted
from the motor side). Cam T1 is built-in with a rapid start fitting, which provides a quick
actuation of the T1 changeover switch after the power to the drive motor was applied. Cam
T2 controls the wash pump, T3 – the hot rinse solenoid/rinse pump, T4 – detergent
injection time. Cam T5 is for control of rinse aid injection time if an optional rinse aid
pump is fitted.
Diagram
Replacement To replace the timer take note of the position of each connection, preferably on paper.
Disconnect all wires and remove the timer from the tray. Compare the cam setting of the
old and new timer to ensure that special settings are duplicated. Fit new timer taking care to
locate cam T1 in the same relative position. Reconnect the wires ensuring that no
termination is under strain. Test the machine to confirm correct operation.
Adjustment The timer cams T4 and T5 are adjustable. The time settings on these cams can be increased
by making the gap in a cam wider, or reduced by reducing the gap. Use a timer adjusting
tool, supplied with a machine to modify a gap in the timer cams.
Service Manual M1-3 (W) 14 Revision 1B

Rinse Thermostat
Part Number 3020
Function Controls the rinse heating elements and prevents operation of machine if the rinse
temperature is below that required.
Description The rinse thermostat is a specially calibrated 3 pole capillary type temperature operated
device. The thermostat does not have a control knob and it is factory set to the
temperatures required by Hygiene Regulations. The first pole’s LTCO changeover contact
is set to operate at 83 ±3°C, the other two poles HTCO contacts are set to 90±3°C.
Switching capacity: 16(4) A 380 V.
Diagrams
LTCO – Low Temp Cut Out
HTCO – High Temp Cut Out
Replacement Take note of the connections to the wiring loom before disconnecting. Remove the
capillary bulb from the rinse tank pocket. Select a new thermostat and carefully unwind
enough capillary to reach from the pocket to the thermostat mounting position. Carefully
position the tube with no kink or stress on the tube, also have due regard for the protection
of the tube against contact with live electrical terminals – secure or insulate as appropriate.
Adjustment
IMPORTANT
To make adjustments to the thermostat you will need a good quality thermometer
fitted with a “type K” thermo junction. The use of a stainless steel probe is not
permitted as slow response time in the device will cause inaccurate settings.
Insert the thermo junction into the rinse tank pocket for the machine’s temperature gauge.
Energize the elements and check all temperatures on temperature rise. Remove the grey
tape covering three adjusting screws and adjust LTCO and HTCO settings if required (one
or both HTCO poles are used depends on model – check which HTCO terminals are
wired before making adjustments). Clockwise rotation of the screws increases the setting,
anticlockwise – decreases it.
IMPORTANT
Do not break the seal or attempt to adjust the central MULTI POLE
ADJUSTING SCREW that is sealed with red compound.
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Service Manual M1-3 (W) 15 Revision 1B

Wash Thermostat
Part Number 30201
Function Controls the wash element
Description The wash thermostat is a single pole capillary type device. It has a single changeover contact
and a rotating shaft for a manual temperature adjustment.
Factory default setting is 65°C.
Contact switching capacity: 16(4) A 380 V.
Diagram
Replacement Drain the wash tank. Take note of the connections to the wiring loom before
disconnecting. Release thermostat’s gland nut, move the capillary bulb out of the mounting
bracket inside the tank and remove the bulb from the wash tank (remove the probe from
the pocket in the wash tank on the models supplied with a pocket for the thermostat
probe). Replace in reverse order.
Adjustment Insert the probe of a digital thermometer into the wash tank. Check the thermostat settings
on a temperature rise. Adjustment is performed by rotating the adjustment shaft of the
thermostat. Clockwise rotation of the shaft increases the setting, anticlockwise– decreases it.
NOTE: the adjustment shaft in a flat horizontal position is a factory default setting
corresponding to 65°C (see the diagram).
Service Manual M1-3 (W) 16 Revision 1B

Solenoid Valve
Part Number 3342
Function Controls flow of water into machine during filling of wash tank and final
rinsing.
Description Electromagnetically operating water valve for use with cold and hot water.
Diagram
Replacement Disconnect the wires from the solenoid connectors.
Remove hot water supply hose.
Release a hose clamp on the outlet solenoid hose and remove the hose.
Slide the solenoid valve up off the mounting bracket.
Replace in reverse order.
Adjustment Remove the flow restrictor for installations with flow rate of hot water supply below 20
litres per minute.
Service Manual M1-3 (W) 17 Revision 1B

Pressure Switch
Part Number 600 30252
Function Controls filling of wash tank and protects wash elements.
Description The pressure switch is attached to the pressure bell. As the water level in the wash tank
rises air is trapped in the bell and increasing pressure is transmitted to the pressure switch.
When the tank is full the pressure switch shuts off the fill solenoid valve and switches on
the wash element. It allows a water level differential so that the tank level may drop with
the operation of the wash pump, without causing refilling of the machine.
Diagram
LEVEL ADJUSTING SCREW
CW rotation increases upper level
setting
DIFFERENTIAL SCREW
CW rotation increases
differential and reduces lower
level settings
Adjustment Before making any adjustments drain wash tank, remove pressure tube from pressure bell,
blow gently into tube to check switching of pressure switch and then fit tube back.
Turn the power switch on, machine should start to fill. The machine should cease filling
when the water attains a level about 10mm below an overflow level of the upstand. Adjust
fill level if necessary by Level adjusting screw on the pressure switch.
Remove drain upstand to begin draining the wash tank. Fit back the upstand when Wash
Ready light goes off and measure the refill water level. A refill level should be set 15-25mm
above the wash element. Adjust if necessary by Differential screw on the pressure switch.
Close door to refill the wash tank and re-check the fill level.
Replacement To remove the switch take note of the electrical connections and remove the wires. Slide
the switch from the mounting bracket and remove the rubber tube from the switch
connector. Replace in reverse order. Whilst in the process of replacing the pressure switch,
ensure that the pressure tube is in good order and clear of obstruction.
IMPORTANT
Ensure the tube from the air bell always goes up to the pressure switch.
Do not use thin wall vacuum tube for replacement.
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Service Manual M1-3 (W) 18 Revision 1B

Wash Pump
Part Number 3888
Function Pumps water from the wash tank to the wash arms providing a recirculating wash
cycle.
Description Electric Pump FIR
Power: HP 0.5 Kw 0.37
Voltage: 220 V
Frequency: 50 Hz
Speed: 2800 rpm
Amperes: 2.6 A
Capacitor: 12.5 uF/400 V
Diagram
Replacement Drain the wash tank and switch off the power.
Disconnect the wires from the pump connectors and the pump capacitor.
Remove M6 bolt that fastens the pump to the floor of the machine.
Release the hose clamps on the inlet and outlet pump hoses and remove the pump.
Replace in reverse order.
ITEM DESCRIPTION PART NO: ITEM DESCRIPTION PART NO:
1 Housing 9 Seal C630510
2 Compensation Ring 10 Impeller 38882
3 Ball Bearing 6201 11 Volute 38884
4 Rotor 12 Gasket 38886
5 Ball Bearing 6201 13 Pump Housing Screw
6 Stator 14 Tie Rod
7 Pump Support 38885 15 Impeller Nut
8 Water Protect.Ring
Service Manual M1-3 (W) 19 Revision 1B

Rinse Aid Injector (Optional)
Part Number C620120
Function Adjustable flow rate hydraulic rinse pump for rinse-aid chemical dosing
Description The injector works by using the water pressure in the rinse line. The pressure in
the input line causes the suction of a determined amount of chemical for each
cycle. At the end of the cycle a spring injects the chemical in the rinse pipeline.
The flow rate is adjustable from 0 to 5cc/pulse.
Diagram
Replacement Disconnect input and output tubes. Release M6 bolt, fastening the pump to a
mounting bracket and remove the pump.
Replace in reverse order.
Adjustment Insert injector inlet pipe into the rinse aid fluid container. Run the machine. Check
the amount of the fluid rising up inside the pipe during the pulse at the start of the
rinse cycle - a 25mm rise within the pipe with 5mm internal diameter will
approximately correspond to the volume of 5 mls of rinse aid fluid per cycle.
The required amount of rinse aid fluid depends on factors such as product type,
water hardness etc. Rotate Adjusting screw clockwise to reduce flow and
anticlockwise to increase flow.
ITEM DESCRIPTION ITEM DESCRIPTION
1 Adjusting Screw 11 Gasket
2 O-ring 12 Piston
3 Cover 13 Suction Valve
4 Spring 14 Plug
5 Nut M6 15 Filter Holder
6 Tab Washer D6 16 Filter
7 Diaphragm Disk 17 Filter
8 Diaphragm 18 O-ring
9 O-ring 19 Lock Nut
10 Gasket Ring 20 Hose Barb
Service Manual M1-3 (W) 20 Revision 1B