EN 50593:2017

SLOVENSKI STANDARD
01-april-2017
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Electric dishwashers for commercial use - Test methods for measuring the performance
Elektrische Geschirrspüler für den gewerblichen - Gebrauch Messverfahren für
Gebrauchseigenschaften
Lave-vaisselle électriques pour usage collectif - Méthodes d’essai pour la mesure de
l'aptitude à la fonction
Ta slovenski standard je istoveten z: EN 50593:2017
ICS:
97.040.40 Pomivalni stroji Dishwashers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50593
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2017
ICS 97.040.40
English Version
Electric dishwashers for commercial use - Test methods for
measuring the performance
Lave-vaisselle électriques pour usage collectif - Méthodes Elektrische Geschirrspüler für den gewerblichen Gebrauch -
d'essai pour la mesure de l'aptitude à la fonction Messverfahren für Gebrauchseigenschaften
This European Standard was approved by CENELEC on 2017-01-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50593:2017 E
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions. 5
4 List of measurements . 8
5 General conditions for measurements . 8
5.1 General . 8
5.2 Conditioning of the machine under test and sequence of test procedures . 8
5.3 Power supply . 9
5.4 Test programme . 9
5.5 Ambient conditions . 9
5.6 Water supply . 9
5.6.1 General . 9
5.6.2 Water supply – Temperature . 9
5.6.3 Hardness . 9
5.6.4 Water Pressure . 9
5.7 Detergent . 9
5.8 Rinse aid . 10
5.9 Load . 10
5.10 Temperature measurement . 10
6 Cleaning and resoiling performance test . 10
6.1 Purpose and general description . 10
6.2 Description of the cleaning performance test procedure . 10
6.2.1 Preparation . 10
6.2.2 Formulation of test soil . 12
6.2.3 Application of test soil . 13
6.3 Evaluation . 14
6.3.1 General . 14
6.3.2 Calculation of performance results . 15
7 Energy, water consumption and time measurement . 15
7.1 General information. 15
7.2 Measurement method . 15
7.2.1 General . 15
7.2.2 Preparation . 15
7.2.3 Initial fill and Start-up time. 16
7.2.4 Energy, water consumption and programme/cycle time . 16
7.2.5 Power consumption – Ready-to-use mode . 17
8 Data to be reported . 18
8.1 Laboratory and test data . 18
8.2 Evaluation sheet for cleaning performance calculation . 20
Annex A (normative) Test materials for laboratories . 22
A.1 Reference Detergent . 22
A.2 Reference rinse aid . 22
A.3 Basic cleaning detergent . 23
A.4 Load . 23
A.5 Test pipette/dispenser . 24
A.6 Stainless steel holder and support . 25
A.7 Sesame seeds . 26
Annex B (informative) Flowchart – Test sequence . 27
Bibliography . 28

European foreword
This document (EN 50593:2017) has been prepared by CLC/TC 59X “Performance of household and similar
electrical appliances”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2018-01-16
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2020-01-16
conflicting with this document have to
be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission and the
European Free Trade Association.
1 Scope
This European Standard applies for manually loaded undercounter one-tank and one-tank hood type electrically
heated dishwashing machines for washing plates, dishes, glassware, cutlery and similar articles.
These machines are used in commercial kitchens, such as restaurants, canteens, hospitals and in businesses such
as bakeries, butcher shops, etc.
This European Standard does not apply to commercial dishwashers with transport systems (flight-type and rack
conveyor dishwashers) and utensil washers.
This European Standard does not apply to undercounter water-change dishwashers.
This European Standard does not apply to appliances designed exclusively for industrial purposes.
The object is to state and define the principal performance characteristics of electric dishwashers for commercial
use and to describe the standard methods of measuring these characteristics.
The characteristics are measured by washing plates.
This European Standard does not address safety requirements.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable
for the application of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 10088 (all parts), Stainless steels
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE The following definitions are related to the appliance.
3.1
commercial dishwasher
electric dishwasher which is specially designed for use in commercial environment and which cleans and rinses
dishes, glasses, cutlery, and, in some cases, cooking utensils by chemical, mechanical, thermal and electrical
treatment
Note 1 to entry: Commercial dishwashers evaluated with a specific drying operation at the end of the programme should be
declared as such in the test report.
3.1.1
under counter one tank dishwasher
manually loaded, programmable, undercounter front loader with one detergent-circulating zone and a fresh water
rinse
Note 1 to entry: The washware is cleaned using a detergent solution that is regenerated. The technical equipment is geared to
the performance that is required in the specific application.
3.1.2
hood-type dishwasher
manually loaded, programmable, hood-type, pass-through machine with typically one detergent-circulating zone
and a fresh water rinse
3.2
operation
event that occurs during the dishwasher programme such as cleaning and rinsing
3.3
programme
series of operations which are pre-defined within the dishwasher and which are declared by the manufacturer as
suitable for cleaning certain washware
3.4
cycle
complete cleaning process, as defined by the programme selected, consisting of a series of operations (washing,
rinsing, drying etc.) and including any operations that occur after the completion of the programme
Note 1 to entry: Examples of operations that may occur after the completion of the programme are refilling of the boiler,
heating, pumps, fans, etc.
3.5
programme time
time which is measured from the initiation of the programme (excluding any user programmed delay) until an end of
programme indicator is showing the end of the programme
Note 1 to entry: If there is no end of programme indicator, the programme time is equal to the cycle time.
3.6
cycle time
time which is measured from the initiation of the programme (excluding any user programmed delay) until all
activity ceases (i.e. the end of the cycle)
3.7
automatic dispenser
device activated automatically which injects or dispenses detergent or rinse agent one or more times into the
dishwasher at predetermined points in the dishwasher cycle
3.8
ready-to-use mode
mode after which the dishwasher has been filled with water, the water has been heated (ready for operation) and
the machine is ready to start the cycle as indicated in the instructions for use
3.9
rack
removable support for holding washware in the dishwasher
3.10
energy consuming element
electrical consumer (e.g. heaters, fans, pumps, etc.) in the dishwasher
Note 1 to entry: The control system is not considered as an energy consuming element.
3.11
washware
materials and utensils that come into contact with foodstuffs and re-usable crates/containers which are cleaned in a
commercial dishwasher
Note 1 to entry: Examples of washware are plates, crockery, cutlery, kitchen equipment, glasses, pots, containers, crates and
trays made of materials such as porcelain, plastic, glass, stainless steel and silver as well as coated materials.
3.12
treating agents
chemical products used to clean or rinse, as rinse aids or descalers, when treating washware in dishwashers
3.12.1
detergent
chemical product used to remove soiling from washware and which counteracts resoiling from the detergent
solution
3.12.2
detergent solution
water mixed with detergent in the detergent circulation tank
3.12.3
rinse aid
chemical agent added to the water in the final rinsing operation which decreases the interfacial tension of the rinse
aid solution
Note 1 to entry: It improves the drying effect and the reduction of water marks.
3.12.4
rinse aid solution
fresh water mixed with rinse aid used for fresh water rinsing
3.13
pre-cleaning
removal of loose waste and leftover food on the washware and emptying of hollow vessels
Note 1 to entry: Pre-cleaning is generally implemented by pushing the residue into waste containers and – if possible – by
rinsing the washware with water. Pre-cleaning reduces the soiling of the dishwasher and improves the cleaning result.
3.14
ballast soil
artificial soil for testing certain machine characteristics
3.15
fresh water rinsing
washing process after cleaning during which the washware is sprayed with a rinse aid solution to remove residues
of detergent solution, dissolved and undissolved dirt particles
3.16
drying
process in which the moisture drips, vaporises or evaporates from the surface of the washware
3.17
cleaning
removal of soiling
3.18
re-soiling
soiling of the washware e.g. on the rear side of the washware by the cleaning process which causes a deterioration
of the cleaning result
3.19
contact time
time during which the detergent solution is in contact with the washware
3.20
cleaning process
process including at least one washing process and one fresh water rinsing process
3.21
operating time
period during which the dishwasher is operational
3.22
spray system
sum of all pipelines, jets and spray pipes required to circulate and spray detergent and rinse aid solutions
3.23
water softener
device which reduces the hardness of water
3.24
start-up time
time needed for the initial fill
3.25
initial fill
first water filling process between activation of the machine and reaching the ready-to-use mode
4 List of measurements
The performance and consumption characteristics are determined as follows:
— cleaning and resoiling performance test according to Clause 6;
— energy, water consumption and time measurement according to Clause 7.
Rinsing performance measurement is under consideration.
5 General conditions for measurements
5.1 General
The dishwasher manufacturer’s instructions regarding installation and use of the commercial dishwasher shall be
followed, except if they stand in conflict. In this case this standard shall prevail.
The cleaning and resoiling performance test according to Clause 6 and the energy and water consumption and
time measurement according to Clause 7 are done together.
Note: deactivate the automatic start for appliances with automatic start cycle when the door/hood is closed.
All testing shall be performed on the same machine.
Before commencing measurements, the commercial dishwasher shall be checked to ensure that it is operating
properly.
All tests shall be started with the appliances at the ambient conditions according to 5.5 .
For all tests, the appliance shall be free-standing in the room without any excess coverage other than originally
equipped. All protective surface cover foils shall be removed.
5.2 Conditioning of the machine under test and sequence of test procedures
Before conducting the performance tests, the dishwasher shall be initially filled and dosed with reference detergent
(specified in 5.7) and reference rinse aid (specified in 5.8). No additional cycles shall be carried out on the machine
under test between the consecutive steps of the following procedures. All parts of the machine shall be inspected
and any residues shall be removed.
5.3 Power supply
In every case the appliance is supplied at 230 V or 400 V and 50 Hz.
The tolerance on power supply shall be ± 1 % for voltage and ± 1 % for frequency.
The voltage and frequency shall be measured and recorded during the test.
5.4 Test programme
The programme to be tested shall be the one which cleans normally soiled washware (standard cleaning cycle).
The manufacturer shall declare the programme to be used for testing.
5.5 Ambient conditions
The following ambient conditions shall be maintained throughout the measurements.
— ambient temperature of the room: (23 ± 2) °C;
— relative humidity: (55 ± 5) % rH;
— air velocity max: 1 m/s.
The limit value for the air velocity shall only apply to the room area where the drying of the soiled plates is carried
out (see 6.2.3).
The ambient temperature and the relative humidity shall be measured and recorded during the test.
5.6 Water supply
5.6.1 General
The actual water temperature and pressure maintained during the tests shall be measured and recorded. The
maintained water hardness shall be measured.
5.6.2 Water supply – Temperature
The temperature of the supply water shall be (15 ± 2) °C.
5.6.3 Hardness
If the dishwasher is fitted with an integrated water softening unit, it shall be deactivated (set to soft water supply).
2+ 2+
During testing, soft water with a water hardness of < 3°dH or a total hardness of (Ca + Mg ) < 0,54 mmol/l shall
be used.
NOTE Procedures to reach a defined hardness of water are described in e.g. EN 60734.
5.6.4 Water Pressure
The flow pressure of the water supply shall be set to 240 kPa and shall be maintained within the range ± 20 kPa.
If it is not possible to maintain the pressure within this range a flow rate of (15 ± 2) l/min shall be maintained.
5.7 Detergent
For the tests solely the reference detergent, shall be used (see A.1).
The concentration shall be (3 ± 0,3) g/l for the tests.
The amount of detergent shall be calculated by the given concentration and the measured water consumption of
the previous operation.
The detergent shall be added by hand directly into the wash chamber.
Detergent from the same batch shall be used for the dishwasher under test.
The detergent manufacturer's specifications regarding storage and handling shall be observed.
5.8 Rinse aid
For the tests solely the reference rinse aid shall be used (see A.2).
The dosing is done according to manufacturer’s instruction
The concentration shall be set according the manufacturer’s instruction.
Rinse aid from the same batch shall be used for the dishwasher under test.
The rinse aid manufacturer's specifications regarding storage and handling shall be observed.
5.9 Load
The load is a rack for the appliance under test defined in A.4.
The rack is loaded in accordance with the manufacturer’s instructions. The washware used for the test purpose are
defined in A.4.
Only washware with no visible damage on the surface, e.g. scratches or similar damages, and free of any residues
shall be used.
5.10 Temperature measurement
The temperature shall be measured every second and recorded during the cycle and reported.
The last rack used in the conditioning cycles with ballast soil (7.2.4) is equipped with a temperature probe
(Accuracy ± 2K) positioned in the centre of the upper surface of stainless steel support fixed on the holder
(see A.6), exact position first row on the left hand side in the front of the rack.
6 Cleaning and resoiling performance test
6.1 Purpose and general description
The purpose of this test is to evaluate the cleaning and resoiling performance and is performed together with the
energy and water consumption and time measurement, as described under 7.2.4.
The procedure consists of the removal of the test soiling, applied in the form of 33 soil dots per plate. After dot
application the plates are air-dried under ambient conditions as defined under 5.5.
To evaluate performance degradation during continuous operation, particles according to 6.2.2.3 are added directly
into the wash tank before the machine cycle starts. For statistical plausibility, in total five cycles shall be done in the
preconditioned dishwasher using the described cleaning solution and standard dishwasher manufacturer settings.
The plates are evaluated by visual inspection at the end of the procedure. The number of not completely removed
soil dots, as well as the number of remaining sesame seed particles on the plates, are counted and statistically
analysed as described in the following procedure.
In case more than one rack is cleaned in one cycle, parameters referring to the number of racks involved shall be
considered accordingly.
6.2 Description of the cleaning performance test procedure
6.2.1 Preparation
6.2.1.1 Basic cleaning of plates (if new plates are used, follow procedure 6.2.1.2)
Before each test, all plates need to be pre-treated with the basic cleaning procedure. Plates are pre-soaked using
the basic cleaning detergent (see A.3) with a dosage of 300 g ± 5 % per 10 l of fresh water at a temperature of
50 °C to 65 °C. The plates shall be pre-soaked for at least 20 min followed by manual pre-scrapping, if needed, so
that the soil or other residues are completely removed from the plate surface. In order to ensure a complete
removal of the basic detergent after basic plate cleaning, all plates shall be rinsed with fresh water and washed in a
dishwasher for two cycles. Only demineralized water (no chemicals) shall be used for the dishwasher.
After basic cleaning, the plates need to be completely air-dried and cooled down to ambient temperature.
An alternative procedure can be applied if the same result is obtained (see 6.2.3).
Only completely dry plates at ambient conditions shall be used for the test.
6.2.1.2 Basic cleaning of new plates
If new plates are used for the test, the following procedure shall be applied: The basic cleaning detergent (see A.3)
with a dosage of 300 g ± 5 % per 10l tank volume shall be used. The detergent is directly added into the wash tank.
The new plates shall then be washed for 10 subsequent cycles in the dishwasher with a wash temperature of 60 °C
to 65°C and a rinse temperature of 80 °C to 85 °C. Load the rack with new plates, put it into the dishwasher and
start the subsequent cycles. When the 10 cycles are finished, drain the dishwasher and refill it with fresh
demineralized water. In order to remove any detergent residues, the dishwasher shall then be run for one complete
cycle with a cycle time ≥ 180 s without the use of any chemicals.
6.2.1.3 Dishwasher
The dishwasher shall be preconditioned according to the standard measuring procedure as described in 7.2.4.
6.2.1.4 Template for dot application
Dimensions
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