Frequently Asked Questions
Frequently Asked Questions
Regarding the installation and general operation of Washtech Dishwashers.
Please refer to the Operator Manual for full installation and operating instructions including tips to optimize the performance of your machine. Contact us for access to our on-line KnowledgeBase for complete technical information including comprehensive Service Manuals for all units.
Back Flow Prevention
All Washtech machines are fitted with atmospheric vacuum breakers and appropriate internal plumbing and chemical injection systems for backflow prevention – except the GE – contact us if you are considering installing this model.
Blockages
Wash and Rinse arms and all filters in the wash chamber must be inspected regularly and removed for cleaning if necessary. Refer machine operator manual
Chemicals
Refer sections on Detergent and Rinse Aid.
Commissioning
Commissioning is part of the correct installation of the machine as explained in the operator manual. We strongly recommend that you use an Authorised Service Provider for installation.
Detergent
Use low-foaming caustic based products from a reputable supplier with good representation – we can recommend one in your area. The machines use approximately 5 – 8 ml of detergent per cycle, depending on detergent strength, water consumption of the machine model, washware soil loadings, and the number of cycles between draining of the wash tank. New Zealand Hygiene Regulations require the use of liquid detergents and automatic injectors.
Note that all dishwashing machine detergents – domestic and commercial – are hazardous and must be handled with care. If commercial liquid detergent is unavailable there is no technical problem using domestic powders – put a capful of product into the machine at start up and add a little when performance declines e.g. every five to ten cycles.
Detergent Consumption
Detergent consumption depends on water used per rack times detergent concentration which is commonly about 3 ml per litre. So an M2 using 2.6 litres per cycle would use about 8 ml of detergent per cycle and wash about 125 racks per litre of detergent, plus a little more for machine filling each day.
Detergent Injection
Washtech machines are supplied standard with a peristaltic detergent pump injector. The pump is inside the machine cabinet and has an inlet hose with a weight and filter on the end. Take this hose through the rear or floor of the machine and insert it into your detergent container. The amount of detergent injected into the machine depends on the time that the injector operates, which is controlled by the cam timer which controls all machine functions. Adjustment of this timer should be by the detergent company representative or authorised service provider.
Dimensions
Machine dimensions are shown on our product brochures. Bench detail is shown in Operator and Service Manuals – available on the KnowledgeBase or on request.
Shipping Dimensions
|
Model |
Uncrated Weight |
Crated Width |
Crated Depth |
Crated Height |
Crated Volm3 |
Crated Weight kg |
|
GM |
48 |
0.59 |
0.65 |
0.87 |
0.33 |
68 |
|
GL |
49 |
0.59 |
0.65 |
0.87 |
0.33 |
69 |
|
GLV |
66 |
0.64 |
0.65 |
0.96 |
0.39 |
81 |
|
UD |
68 |
0.71 |
0.69 |
0.97 |
0.47 |
86 |
|
M1 |
85 |
0.68 |
0.74 |
1.45 |
0.72 |
107 |
|
M2 |
94 |
0.76 |
0.83 |
1.45 |
0.91 |
125 |
|
AL |
116 |
0.79 |
0.95 |
1.45 |
1.08 |
151 |
|
AL8 |
150 |
1000 |
910 |
1650 |
1.50 |
176 |
|
PW1 |
125 |
850 |
850 |
1790 |
1.29 |
165 |
|
PW2 |
230 |
1310 |
910 |
1830 |
2.18 |
275 |
|
PW3 |
220 |
1450 |
1050 |
1730 |
2.63 |
276 |
|
CD100 |
184 |
1700 |
875 |
1510 |
2.25 |
262 |
|
CD150 |
265 |
2300 |
875 |
1510 |
3.04 |
350 |
|
CD200 |
340 |
2905 |
840 |
1905 |
4.65 |
440 |
Drain pumps
Drain pumps are standard on GLV and UD models and available as an option on most models. We recommend gravity connection wherever possible, but the optional drain pumps will lift waste water to bench height when required. Read the installation instructions when installing a machine with a drain pump to ensure correct operation.
Draining the machine daily
It is absolutely vital to drain the machine at least once daily and any time that the machine is left idle for more than a few hours. Drain the machine while it is still hot to drain all dirty wash water and oils etc. in the water. Failure to drain the machine daily will cause faults such as the machine running the rinse system continually even though it is full. If this occurs drain the machine and allow it to sit for a few minutes before refilling.
Electrical Requirements
Typically 25 amp single phase for most models except the AL which is 15 amp per phase, 3 phase, 5 wire supply, that is 3 phase, neutral and earth . If there is difficulty with these current loadings we can reduce the heating capacity – refer below. Note we can supply machines in special voltages including marine requirements. Potwashers and Conveyor machines are all 3 phase, neutral and earth.
Electric Supply Current Reduced to 15 amps
Typically our machines are fitted with 5kW of rinse heating. We can reduce this to 2.5kW. Note that reduced supply current may cause delays between operating cycles, particularly if the hot water supply is poor.
Electrical Ratings
|
kW |
phase |
amps/ph |
minimum |
|
|
GM |
5 |
1 |
22 |
14 |
|
GL |
5 |
1 |
22 |
12 |
|
GLV |
5 |
1 |
22 |
15 |
|
UD |
5 |
1 |
22 |
15 |
|
M1 |
5 |
1 |
22 |
15 |
|
M2(1) |
6 |
1 |
25 |
15 |
|
M2(3) |
8 |
3 |
11 |
11 |
|
AL |
9 |
3 |
15 |
|
|
AL8 |
17 |
3 |
25 |
|
|
PW1 |
9 |
3 |
15 |
|
|
PW2 |
18 |
3 |
30 |
|
|
PW3 |
18 |
3 |
30 |
|
|
CD100 |
16 |
3 |
25 |
|
|
CD1006D |
23 |
3 |
35 |
|
|
CD10012D |
29 |
3 |
40 |
|
|
CD150 |
18 |
3 |
30 |
|
|
CD1506D |
25 |
3 |
35 |
|
|
CD15012D |
30 |
3 |
45 |
|
|
CD200 |
25 |
3 |
40 |
|
|
CD2006D |
32 |
3 |
50 |
|
|
CD20012D |
38 |
3 |
55 |
Fisher
Refer section Pre-Rinsing.
Installation
Refer the Operator Manual for complete installation instructions. We recommend you use Washtech authorised Service Providers for assurance of correct installation. Faulty installation may void warranty. Refer also FAQ’s on Electrical, Waste and Water Supply.
Maintenance
Hard working machinery needs regular maintenance and the dishwasher is one of the hardest working machines in the kitchen. We provide maintenance programs to protect the investment in your machine, reduce downtime and provide a report confirming that your machine is sanitising dishes as it should – a useful hygiene assurance tool.
Moving machines for cleaning
The UD and GLV models are designed to be moved for cleaning. Wheels are fitted to the rear of these machines – drain the machine, close the door and use the door handle to lift the front of the machine slightly and gently pull the machine from the recess. Be sure to check that the drain hose is in place before pushing the machine back. Other models stand on 150mm legs to provide cleaning access beneath the machine.
Overflow
If your machine is overflowing onto the floor this is usually caused by a blocked drain which a plumber can remedy. GLV and UD models are fitted with drain pumps as standard and failure of these pumps can cause the machine to overflow.
Pre-Rinsing
Food Hygiene Regulations require scraping of plates – removal of food scraps from plates before they are machine washed. This can be done scraping, dunking in water or – most easily – by spraying with a Fisher Pre-Rinse Spray unit. These units have low water consumption and are very effective using only cold water. Unless dishes are very heavily soiled with baked or dried on food, do not pre-wash them before placing in the machine. If you do any soaking or pre-treatment of dishes, do not use a sink detergent as even small quantities can causing foaming in the machine which significantly reduces effectiveness.
Quality Assurance
Washtech is an ISO 9001 Quality Assured Supplier – audited regularly by BVQI to confirm compliance with this prestigious standard.
Rack Sizes – glassracks and dishracks
|
AL, AL8, CD, UE, M2, UD |
500mm |
|
GLV, M1 |
450mm |
|
GM, GL |
435mm |
Regulations
Washtech machines comply with all local codes and requirements
Rinse Aid
Also known as Rinse Fluid, or Drying Agent – injectors are generally not fitted as standard but are available as an option, or from your chemical supplier. About 5 ml of rinse fluid is used per cycle, depending on factors such as product type, water hardness etc. Rinse Aid promotes faster drying of washware.
Rinse Pump requirement
Rinse pumps are available with our machines, but they are not generally required, as water supply pressure normally exceeds 2 bar = 200kpA = 30 psi. Water flow rate of 20 litres per minute is required. Rule of thumb is that if you can stop the flow of hot water out of a tap on your premises with your thumb, then you do need a rinse booster..
Serial Number
The serial number of your machine is normally found in the label on the lower right corner of the front of the machine, preceded by the model e.g. GLV123456.
Service calls – Machine not working
Before calling for service first check that the power and water supply are turned on and the drain upstand and all filters are in place. If the machine is full of water remove the drain upstand, drain the machine and then try refilling it. Check that the door is properly closed. Note which control lights on the panel are lit up and also note the model and serial number from the label – usually lower right corner of the front of the machine.
Service Providers
Contact us for detail on your local authorised Washtech Service Provider.
Sterilisation / Sanitisation
Our machines do not sterilise – this requires temperatures over 100oC. They do sanitise as defined by Food Hygiene Regulations i.e the machine will not operate unless it can deliver rinse water over 83oC to the washware for ten seconds. Pre-washing of dishes is not required. Read the Operator Manual, ensure that you have good quality detergent connected and adjusted to correct levels, follow operating procedures and you will get excellent wash performance from your Washtech dishwasher.
Temperature Compliance Food Hygiene Regulations
Washtech machines are guaranteed to comply with food hygiene regulations. If there is any question about a machine complying please contact us.
Temperature Adjustment
Must be carried out by a qualified technician who can adjust wash and / or rinse thermostats.
Ventilation / Extraction
Refer local codes and local authorities for their interpretation of codes. Conveyor machines typically require around 200 litres per second extraction if connected directly. Where canopies are installed full consideration must be given of the size and characteristics of the room – consult ventilation expert.
Warranty
Standard warranty is 12 months parts & labour new machines. Extended warranties and preventative maintenance contracts are available on request.
EXTENT OF WARRANTY
Washtech shall repair or, at its discretion, replace any part of the machine found to be defective.
The labour for the repairing or the replacement of defective parts shall be provided during normal office hours at no cost to the user.
Washtech shall not otherwise be liable for any other loss or damage arising out of any person’s use or inability to use the machine.
Washtech shall not be liable for the cost of work done outside normal office hours, and for travel costs outside regional centres.
Washtech shall not be liable for detergent related issues, including detergent pump adjustment or squeeze tube replacement, drain pump blockages and other related damages.
CONDITIONS OF WARRANTY
This warranty shall not be binding on Washtech unless the warranty registration card is completed and received by Washtech within 30 days from the date of purchase.
This warranty shall be void if:
The equipment has not been properly installed by an authorised Washtech Service Provider.
Persons other than Washtech Service Providers have undertaken repairs or attempts at repair.
The equipment has not been operated and maintained in accordance with the Operator Manual.
Damage has resulted from shipment, handling, fire, water, accident, abuse, detergent equipment fitted by others or any other event beyond the control of Washtech.
Any defect must be notified to Washtech or its authorised dealer within 30 days of the discovery of the defect.
IF YOU WISH TO MAKE A WARRANTY CLAIM
First check the things you can do for yourself. Refer to the Operator Manual provided to ensure that the machine is correctly installed and that you are familiar with its operation. If a service technician calls and determines that the equipment is not defective you will be charged with the cost of the call-out.
If you need service during the warranty period, first contact the dealer from whom you purchased the equipment. The Dealer will arrange service by Washtech or an authorised Washtech Service Provider.
If you have a problem contacting your dealer or if your dealer is unable to assist, then please contact the Service Department, Washtech, telephone 09 829 0923.
When you write or call you will need to provide your name and address, the model and serial number (refer lower front cover) and the date of purchase so that your warranty claim may be validated.
Wash Performance
Read the Operator Manual, check that you have good quality detergent being injected at correct levels, follow operating procedures and you will get excellent wash performance from your Washtech dishwasher. Pre-rinsing is recommended but pre-washing is not required except for heavy soiling with baked or dried on foods. If you are not pleased with wash performance – contact us.
Wash Tank Capacities
Approximate wash tank capacities in litres are as follows:
|
GLV, UD |
10 |
|
GM |
15 |
|
GL |
15 |
|
UE, M1 |
20 |
|
M2, AL, PW1 |
30 |
|
AL8 |
40 |
|
CD100, PW2 , PW3 |
80 |
Waste Requirements – Copper or P.V.C.
PVC is less expensive, easier to install and more resistant to some harsh detergents. Some authorities sometimes suggest that copper is required because the machine rinses at up to 90oC. Please note however that the rinse water mixes with the 65oC wash water before discharge, and then flows into the trap, where the water is cooled further, before entering the drainage plumbing. We have thousands of machines installed on PVC waste systems and provided the PVC is properly installed, and supported as specified then there are no problems with it, but if in doubt contact your local authority.
Water Consumption
Most models use less than 3 litres per cycle except the GE which uses about 6. Note that on multicycle machines, no more water is consumed on long cycles than on short – so use the long cycle whenever possible to ensure the best results.
Water Flow Rate
Flow rate required is 20 litres per minute. 3 litres delivered in 12 seconds equates to 15 litres per minute minimum, so your water system should be capable of more than this – say 20 litres per minute. This means that many instantaneous hot water systems are NOT suitable. Talk to your plumber, but make sure that they understand that although the consumption is around 3 litres per cycle, this amount must be delivered within the time of 12 seconds. Provided the unit has a flow rate better than 15 litres per minute it should be okay.
Water Supply Instantaneous Heaters
Provided they have a flow rate of more than 15 litres per minute these units can be an acceptable option for hot water supply – refer Water Flow Rate. However if the kitchen is not busy and the heater is some distance from the machine there can be issues. Usually it takes a few seconds of water flow for the heater to come to temperature – the first water discharged is not hot. By the time the water is hot the machine cycle may be finished. This water cools in the lines before the next cycle, etc. so the machine never receives hot water, resulting in delays between cycles. No problem if the kitchen is busy and the lines are kept filled with hot water. Check the water in a tap adjacent to the machine – if it is not hot, then the machine is not getting hot water.
Water Supply Specification
We recommend soft potable hot water supply of 65oC , 200 – 350 kPa pressure, 20 litres per minute flow rate. When pressure and flow are below this range a rinse booster pump is required. Above the specified pressure range a pressure limiter must be fitted. Temperature below specification may cause delays between machine operating cycles.
Cold water supply is not recommended, but possible for all models except the GE. Contact us if you are in a situation where there is difficulty meeting our water supply specification for hot water supply.
Our full water quality specification is:
|
Hardness |
fH |
dH |
ppm |
gr/gal |
pH |
|
min |
2 |
1 |
20 |
1 |
7 |
|
max |
10 |
6 |
100 |
6 |
8 |
|
Ions |
CI- |
SO4 |
Fe |
Mn |
Cu |
CL2 |
|
max mg/l |
100 |
400 |
0.1 |
0.05 |
0.05 |
0.1 |
Water Supply – Hot Water Cylinder Sizing
Failure to provide adequate hot water supply will result in delays between dishwasher operating cycles, so correct hot water cylinder sizing is important. This obviously depends on how much you use the machine. Most models use 3 litres or less per cycle – multiply this by the number of cycle per hour you expect to use the machine. The heat rise required is about 50oC, that is you need to heat the water from about 15oC to 65oC. 1kW of heating will recover about 15 litres of hot water in one hour for a 50oC rise. So for every 5 dishwasher cycles per hour you need 1kW of heating element for continuous use. With a common 3kW element, you can do 15 cycles per hour, which would be about 270 plates in an M2 model dishwasher. Storage capacity does help to even out peak usage so you could probably get 25 cycles out of a 180 litre electric cylinder with a 3kW element in the first hour, but would experience delays between cycles after that time. Gas cylinders generally provide much faster recovery than electric and are recommended for this reason. A standard gas cylinder has an equivalent of about 7.5kW rating, so you should get more than 35 cycles per hour – continuous use – out of a standard gas cylinder – which is a high use rate. Caution – consider all the other uses you have for hot water in addition to the dishwasher. We strongly recommend pre-rinsing with a Fisher pre-rinse gun and cold water is entirely appropriate for pre-rinsing – if hot is used this is obviously an additional use. Note also that if your water temperature is kept below 55oC, to prevent scalding, that this is lower than the supply temperature specified for the dishwashers and can result in delays between cycles.
Wet Dishes
Commercial Dishwashers do not incorporate a drying cycle – they wash and then rinse with very hot water and dishracks should then be removed and placed on the bench for a few minutes for dishes to dry. Provided correct detergent and rinse fluids are used most items – other than plastics – will dry rapidly. If the rack is left in the machine with the door closed at the end of the cycle, the dishes will not dry.