Washtech TW User manual
TW
UNDERCOUNTER TRAYWASHER
OPERATOR MANUAL
General Warnings
Non-compliance with warnings or failure to follow the instructions in this
manual can result in loss of life, severe personal injury and / or serious damage to
property.
Before installation, commissioning and / or repair of the machine you must
carefully read the safety instructions and warnings and all warning labels
attached to the machine.
Hazards can include high surface temperatures, hot water, caustic detergent,
sharp edges including broken glass and knives left in the wash chamber, and
dangerous electrical voltages.
All service work must be carried out by qualified personnel only who ensure
compliance with all local codes and standards including AS/NZS 3500.1.
The electrical supply must be turned off at the wall before accessing the
machine for servicing. All electrical terminals must be covered at all times to
prevent access to the terminal. Appropriate electrical tests must be carried out
after any and all service repairs.
Important Information
Failure to comply even partially with the instructions given in this manual will
invalidate the product warranty and relieve the manufacturer of any
responsibility. This includes failure to supply the machine with good quality
water at suitable pressure as specified.
The alteration of machine operation or design or replacement of parts not
approved by the manufacturer may void warranties and approvals.
This machine is intended for commercial use only. It is designed for the cleaning
of fresh food waste from cutlery, crockery, glassware, containers and food
preparation equipment. Consult the manufacturer regarding suitability for other
applications.
No part of the machine is designed to be stepped upon. It is not a waste disposal
unit.
It is essential that operating procedures are followed including adequate pre-
rinsing or scraping loose soil or waste from washware before it is placed in the
machine, and regular cleaning and maintenance of the machine.
The information contained in this document is checked, reviewed and updated regularly to
ensure that it is accurate and relevant to the model described. However discrepancies and
errors can occur. We welcome your feedback.
This 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
Washtech.
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Contents
2. Warning
3. Contents
4. Safety Instructions
5. Installation Diagram
6. Installation Instructions
8. Installation Checklist
9. Installation Troubleshooting
10. Operator Use Guide
11. Operator Troubleshooting
12. Schematic Diagram
13. Accessories
14. Spare Parts List
Installation
•Use qualified, skilled personnel.
•Follow installation instructions.
•Connect to correct voltage and supply current.
•Provide fully accessible Electrical Isolation Switch & water supply valves.
Training and Supervision
•Read and Understand the Operating instructions and train all staff.
•This appliance must not be operated by children or infirm persons.
•Machine panels must only be removed by suitably qualified and trained personnel – internal
hazards include live electrics and very hot surfaces.
•No part of this appliance is intended for use as a stepladder.
Hot Surfaces
•Some surfaces may be hot or very hot.
Chemicals
•Commercial dishwashing detergents are hazardous – handle with care.
•Read and follow the safety information found on the labels of detergent containers and
Material Safety Data Sheets.
•Use protective eyewear and clothing if decanting containers.
Hot Water
•Do not put hands in wash water which may be over 60°C and contain hazardous caustic
detergent.
•Rinse water can be over 90°C.
•Door safety switches are designed for emergency use only.
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.
Warnings
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 and servicing must be carried out by a suitably qualified person in
compliance with all local codes and standards including AS/NZS 3500.1.
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Safety Instructions
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Installation Diagram
TW Installation Diagram
•Part #: TW0020
•Date: 13/06/2018
•Version: 1-A
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Machine Positioning
•Unpack machine, check for damage and complete delivery.
•Install machine on sound waterproof self-draining floor and use adjustable feet to level
machine.
NOTE: Failure to level the machine correctly may result in leaking during the cycle,
overflowing from the door sill, poor hygiene through the wash tank not being able to
drain correctly, and/or visibly uneven door.
•Allow room for detergent to one side of machine or in adjacent cupboard. 20 litre container
requires approximately W 250mm x D 350mm x H 450 mm, but smaller containers are
available from many suppliers.
Inlet Water
Incoming water should be within the following standard requirements:
•Temperature: 65°C.
NOTE: Low temperatures will increase the recovery time between cycles and depending
on the chemical being used, may result in excessive foaming if the machine is started
before the wash water is up to a suitable temperature.
NOTE: Excessively high temperatures may damage the solenoid which can result in
flooding should this component fail. High temperature solenoids are available and can be
retrofitted if necessary.
•Connection: 20 mm (3/4” BSP) male – flexible hose supplied.
NOTE: Flush supply line before connection. Poor quality supply or excessive water
hardness may affect performance or damage machine – filtration and/or softening is
recommended.
•Flow rate: minimum 20 litres per minute.
•Pressure: between 200 and 350 KPa
NOTE: NOTE: If above 350kPa fit pressure limiter valve (LPV). Do not use small diameter
plastic supply lines.
Note: if below 200 KPa fit a rinse booster pump.
•Consumption: Approximately 3.3 litres per cycle.
•Backflow prevention: Atmospheric Vacuum Breaker (AVB) fitted standard.
•Watermark Certification #08603.
Water Quality Requirements
The incoming water should also be within the following parameters:
Hardness ppm pH
min 20 7
max 100 8
Ions Cl- SO4Fe Mn Cu Cl2
Max mg/L 100 400 0.1 0.5 0.05 0.1
NOTE: Levels above or below the stated requirements can be expected to increase
component wear and reduce the expected useful life of the dishwasher. If in doubt, it is
best to consult a water specialist and have the incoming water professionally tested and
treated if necessary.
Power
•Electrical supply required is 1P+N+E, 230V 50Hz 15A per phase via switched outlet adjacent to
machine.
NOTE
: 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 Instructions
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Chemical
•This dishwasher is supplied with Detergent and Rinse Fluid injector pumps
•To connect to chemicals, insert pump inlet hose into container of commercial low foam
detergent and rinse fluid.
•To prime the detergent, press the detergent prime switch on the machine control panel until
supply hose is refilled.
•To prime the rinse fluid, press the rinse fluid prime switch on the machine control panel until
supply hose is refilled.
NOTE: Externally adjustable chemical pumps are fitted and pre-set at an average level,
these need to be calibrated on site according to the chemical being used and site specific
conditions such as the water quality and how the machine is being used. Failure to do so
may result in excessive dosing which can result in foaming and overflowing, or
insufficient dosing which can cause inferior wash results and impact components
through a build up of grease. If in doubt, contact your chemical company for assistance.
NOTE: Commercial detergents can be hazardous – read instructions, store safely and
handle with care. Care needs to be taken when changing chemicals, ensuring that the
detergent is not accidentally connected to the rinse fluid inlet line.
NOTE: If uncertain, please consult a chemical specialist for assistance in selecting the
right chemicals and calibrating machine settings to suit this along with your unique site
conditions and requirements.
Waste
•A drain pump and drain vent loop are fitted standard on this machine.
•The recommended installation of the drain hose is into a standpipe.
•For drain hose installation into a standpipe, the hose should be lifted no higher than 350mm
above the machine base to avoid water returning to the wash tank after draining.
•For drain hose installation into a sink waste connection, the drain hose must be secured to a
point at least 50mm higher than the sink drain connection. This will avoid water potentially
back-flowing from the sink into the dishwasher. For undercounter installed machines with a
sink waste connection a small amount of water will return to the wash tank after draining.
NOTE: Failure to correctly connect the drain hose and ensure correct plumbing is in
place beyond this may result in blockages, backflow from the sink and/or flooding of the
machine.
NOTE: Either copper or P.V.C. may be used for the waste connection – P.V.C. is more
resistant to some harsh detergents. Some authorities however suggest that copper is
required because the machine rinses at up to 90°C. It is important to note that rinse
water mixes with the 65°C wash water before discharge and then flows into the sink
trap where the water is further cooled before entering the drainage plumbing. We
recommend consulting your local authority to ensure your site remains compliant.
Installation Checklist
•Complete attached Installation Checklist to ensure machine is installed and running correctly,
and operator is familiar with operating procedures.
Installation Instructions
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Installation Checklist
Check Notes
DELIVERY
SUPPLIED COMPLETE? CHECK THERE HAS NOT BEEN ANY TRANSIT DAMAGE
POSITION
LEVEL AND STABLE? ON SOUND, WATERPROOF, SELF-DRAINING FLOOR
WATER
ISOLATOR VALVE FITTED? ACCESSIBLE, ALL FITTINGS SOUND, AND NO LEAKS
TEMPERATURE CORRECT? *16 9#6'4+0.'6Ĺ%
PRESSURE CORRECT (200 – 350 kPa)? LIMITER FITTED IF ABOVE RANGE
FLOW RATE CORRECT (≥ 20L PER MIN)? FLOW RATE AT OR ABOVE MINIMUM RANGE
QUALITY WITHIN REQUIREMENTS? FILTER OR SOFTENER IN PLACE IF OUTSIDE REQUIREMENTS
POWER
ISOLATING SWITCH? FITTED, FUNCTIONAL AND ACCESSIBLE
CORRECT SUPPLY (1p/15A 240V 50Hz)? VOLTAGE, CURRENT AND CIRCUIT BREAKER
WASTE
CONNECTION TO STANDPIPE/SINK WASTE? CORRECT CONNECTION TO PLUMBING
SUITABLE AIR GAP? REFER INSTALLATION INSTRUCTIONS - WASTE
CHEMICALS
CHEMICAL NAME CONTAINER NO LEAKS PRIMED CALIBRATED
DETERGENT
RINSE FLUID
MACHINE OPERATION
MACHINE RUNNING CORRECTLY? MULTIPLE CYCLES RUN, NO ISSUES
CHEMICAL DOSAGE CORRECT? CORRECTLY FLOWING INTO MACHINE, NO FOAMING
ALL OPERATIONS CORRECT? FILL LEVEL CORRECT, NO DRAINAGE ISSUES
OPERATOR TRAINING
ENSURE THAT THE CUSTOMER HAS BEEN GIVEN THE OPERATION MANUAL AND WALL CHART. ALSO ENSURE THE CUSTOMER
IS AWARE OF THE IMPORTANCE OF USING AND CLEANING THE MACHINE CORRECTLY.
START UP FOLLOW CORRECT START UP PROCEDURE
PRE-RINSE AND RACKING BETTER TO RINSE PLATES THAN REMOVE WASTE FROM MACHINE
MACHINE USE AND CYCLE SELECTION USE LONG CYCLE WHERE POSSIBLE
DRAINING THE MACHINE DRAIN THE MACHINE DAILY
SHUT-DOWN AND DAILY CLEANING CHECK WASH ELEMENTS HAVE COOLED BEFORE CLEANING
WEEKLY MAINTENANCE FULL MACHINE CLEAN INCLUDING WASH/RINSE ARMS
PLANNED SERVICNG IMPORTANCE OF HAVING MACHINE SERVICED REGULARLY
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Installation Troubleshooting
Door not closing properly
•Level the dishwasher.
Machine not starting or filling
•Ensure water supply to machine is turned on.
•Ensure power supply to machine is turned on.
•Check that the water inlet hose isn’t twisted or kinked.
Cycle taking too long
•Check inlet water temperature is not too low as per our specifications.
•This machine ships with Thermostop enabled, which allows a cycle to be started at any time,
even if the rinse water is not up to required temperature. To ensure a hygienic result, the
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stage washing will stop and the machine will begin rinsing to complete the cycle.
Poor wash results
•Check that there are adequate pre-rinse processes in place and staff use longer cycle options
for more heavily soiled items.
•Ensure high quality non-foaming commercial dishwasher detergent has been connected at
the correct dosage for your site, water quality and application. If uncertain, consult a
chemical specialist.
•Check that the wash arm is spinning freely and is not being obstructed.
•Ensure that the wash temperature is between 60°C and 65°C.
Chemical residue on items after the cycle
•Check that nothing is obstructing the wash/rinse arms from rotating.
•Check the rinse fluid dosage is not too high. If uncertain, please consult a chemical specialist.
•Check detergent dosage is within the requirements.
Dishwasher is foaming
•Ensure there is no other soap being transferred into the machine from the sink.
•Ensure high quality non-foaming commercial dishwasher detergent has been connected at
the correct dosage for your site and application. If uncertain, please consult a chemical
specialist.
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dishwasher chemical will foam at low temperatures.
Other equipment in the kitchen has needed filters or has scale
•Due to the high temperatures in dishwashers, scale will build up in the wash tank, on the arms
and in the rinse tank. The incoming water should be treated. If uncertain, please consult a
water specialist.
•As with combi-ovens, high chloride levels will do irreversible damage to a number of the
components inside a commercial dishwasher. The incoming water should be appropriately
treated. If uncertain, please consult a water specialist.
Cycle times not suitable for items being washed
•Some sites may require longer/shorter cycles depending on the items being washed and the
soil levels. Cycle lengths can be adjusted by a qualified service agent accessing the WI-200
Electronic timer. For adjustment instructions refer to the adjustment section of the Service
Manual for the model or the WI-200 Service Manual.
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Operator Use Guide
START
•Turn on at wall
•Ensure the Drain Filter (3) and Wash Pump Filters (2) are firmly in place.
•Check the Scrap Trays (1) are in place and shut door.
•Press the Power button, the button will glow red and the machine will fill automatically.
OPERATION
•Load items into the machine and shut door.
•Select either Cycle 1 (2 minutes) or Cycle 2 (4 minutes) button to start a cycle.
•Both Cycle buttons glow green while machine operates.
•When Cycle lights go out, the cycle is complete.
NOTE: The machine may be started while the rinse water is being heated – the machine will
continue to run the wash cycle until the rinse water is up to temperature.
SHUT DOWN - EVERY NIGHT
•Open the door and press the Drain button, leave the door open.
•Allow to drain for approximately 1 minute or until the tank is empty.
•Turn the Drain and then the Power buttons off.
•Once the machine has cooled down, clean the wash tank, then remove and rinse Scrap
Trays (1) and Wash Pump Filters (2) before replacing back in machine.
CLEANING – AT LEAST ONCE A WEEK
Remove, rinse and replace when machine has cooled down:
Scrap Trays 1
Wash Pump Filters 2
Drain Filter 3
Wash Arms 4
Rinse Arm 5
Inspect and clear all jets in the upper and lower
Wash/Rinse Arms using a small object such as a
toothpick where necessary to remove any
blockages prior to rinsing.
SUGGESTED BEST PRACTICE
Pre-rinse Scrape and/or rinse trays, plates & glasses in cool water.
Chemical Chemical alarm lights indicate when a chemical drum is empty. Replace
chemical and press the corresponding prime switch until supply pipe is
refilled.
Use a good quality non foaming commercial detergent and drying agent – do
not use domestic detergents which will cause the machine to foam.
Power
Wash
Temp
Drain Rinse
Temp
Cycle 1
Cycle 2
Prime
Switches
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Operator Troubleshooting
Issue Cause
POOR PRE-SCRAPING
CARRY OVER OF SOAP FROM SINK
OVERLOADING RACKS
INADEQUATE CLEANING
DRAIN UPSTAND NOT PLUGGED IN
WASH/RINSE JETS BLOCKED
WASH/RINSE ARMS NOT ROTATING
DETERGENT DOSAGE LOW/HIGH*
RINSE FLUID DOSAGE LOW/HIGH*
POOR WATER QUALITY**
DISHES NOT CLEAN
STAINING
FOAMING
PROTEIN BLOOM
DIRTY MACHINE
FOOD RESIDUE ON WARE
FILM/SPOTS ON WARE
DETERGENT RESIDUE
GREASY FILM/NO FIZZ
HIGH DETERGENT USE
HIGH RINSE FLUID USE
WET WASHWARE
SCALE BUILD UP IN MACHINE
Likely cause Possible cause
* For issues most likely due to incorrect chemical dosages or other chemical issues we
recommend you consult your chemical supplier and/or a local chemical expert prior to calling
in a dishwasher technician.
** For issues that are likely due to poor water quality (scale building up, filters being required
on other kitchen equipment etc.) we recommend you consult a local water specialist prior to
calling in a dishwasher technician.
IF PROBLEMS PERSIST CONTACT MOFFAT SERVICE ON 1300 264 217
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Schematic Diagram
TW ET Schematic Diagram
•Part #: 160106
•Date: 13/03/2019
•Version: 1-C
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Accessories
TW Accessories
•Part #: TW ACW
•Date: 10/07/2018
•Version: 1-A
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DESCRIPTION PART NO REC. STOCK
Cabinet & Door
•Circlip External 7.6 mm 600 80082 1
•Circlip External 13 mm 600 80083 1
•Door Stop Bracket 278 20066 2
•Door Stay 361 20054 2
•Rear Wheels Assembly Kit 400 10219 1
•Front Cover 361 20016 1
•Rear Panel 361 20072 1
•Removable Rear panel 361 20071 1
Controls & Indicators
•Detergent Prime Button 600 30568 2
•Detergent/Rinse Aid Level Sensor 600 30294 2
•Door Reed Switch 600 30183 1
•Power Button 600 30567 1
•Start fast button 600 30564 1
•Start run button 600 30565 1
•Relay 12V 2 Pole 600 30444 1
•Pressure Switch 600 30079 1
•Relay Base 600 30081 1
•Electronic Timer 600 30546 1
•Drain Switch 600 30517 1
•Temperature Gauge 600 30515 2
Heating Components
•Over Temperature Thermostat 600 30088 1
•Rinse Element 3KW 600 30495 1
•Rinse Tank Assembly 400 10208 1
•Rinse Thermostat 3020 1
•Wash Element 2.5KW 600 30159 1
Hoses
•Detergent Squeeze Tube 600 30134 1
•Rinse Aid Squeeze Tube 600 30119 1
•Rinse Hose 600 60073 2000mm
•Upper Wash Hose 400 90012 1
•Lower Wash Hose 400 90012 1
•Pressure Switch Hose 3067 200mm
•Drain Hose 400 90012 1
•Wash Pump Inlet Hose 1262 1
•Wash Pump Outlet Hose 6196 40mm
•Wash Pump Tee Hose 6195 40mm
Spare Parts
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DESCRIPTION PART NO REC. STOCK
Pumps and Solenoids
•Detergent Pump 600 30526 1
•Rinse Aid Pump 600 30480 1
•Drain Pump 600 60102 1
•AVB 600 60053 1
•Solenoid Valve 3341 1
•Wash Pump 3888 1
Wash Tank Components
•Drain Cover 361 20085 1
•Wash Inlet Filter 361 10021 1
•Scrap Tray 361 10020 1
•Capscrew 400 30344 1
•Capscrew Securing Bracket 400 20191 1
•Rinse Arm End Plug 400 30200 2
•Rinse Arm Jet 600 20013 2
•Split Ring Acetal 400 30190 1
•Wash Arm End Plug 600 80072 2
•Wash / Rinse Arm Assembly 400 10311 1
•Wash / Rinse Arm Bush 400 30365 2
•Wash / Rinse Arm Spindle 400 30356 1
Spare Parts
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
Distributed in Australia by Moffat Pty Limited
740 Springvale Road
Mulgrave 3170
Victoria
Australia
24HR Service 1300 264 217
Parts 1300 263 107
Tel 03 9518 3888
Fax 03 9518 3818
E-mail [email protected]
web www.moffat.com.au
ISO9001
All Washtech products are designed and
manufactured by Washtech using the
internationally recognised ISO9001 quality
management system, covering design,
manufacture and final inspection, ensuring
consistent high quality at all times.
In line with policy to continually develop and
improve its products, Washtech Ltd reserves the
right to change specifications and design without
prior notice.
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