EN 203-1:2005

SIST EN 203-1
SLOVENSKI
STANDARD
februar 2006
Plinske naprave za gostinstvo – 1. del: Splošna varnostna pravila

(istoveten z EN 203-1:2005)
Gas heated catering equipment – Part 1: General safety rules

Appareils de cuisine professionnelle utilisant les
combustibles gazeux – Partie 1: Règles générales de
sécurité
Großküchengeräte für gasförmige Brennstoffe – Teil 1:
Allgemeine Sicherheitsanforderungen

Referenčna oznaka
ICS 97.040.20 SIST EN 203-1:2006 ((sl),en)

Nadaljevanje na straneh II do IV in od 1 do 75

© 2006-02: Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 203-1: 2006
NACIONALNI UVOD
Standard SIST EN 203-1:2006 ((sl),en), Plinske naprave za gostinstvo – 1. del: Splošna varnostna
pravila, ima status slovenskega standarda in je z metodo ponatisa z nacionalnim dodatkom privzet
evropski standard EN 203-1:2005.
Ta slovenski nacionalni standard zamenjuje slovenski nacionalni standard SIST EN 203-1:1997 in
dopolnili SIST EN 203-1:1997/A1:1997 in SIST EN 203-1:1997/A2:2001.
NACIONALNI PREDGOVOR
Evropski standard EN 203-1:2005 je pripravil tehnični odbor Evropskega komiteja za standardizacijo
CEN/TC 106 Plinski aparati za gostinstvo.
Pripravo tega standarda sta Evropska komisija in Evropsko združenje za prosto trgovino poverila
CEN. Povezave z direktivo (-ami) EU so razvidne iz dodatka ZA, ki je sestavni del tega standarda.
Slovenski standard SIST EN 203-1:2006 je dne 31. januarja 2006 po pooblastilu Strokovnega sveta
za splošno področje sprejel tehnični odbor SIST/TC PLN Plinske naprave za dom.
NACIONALNI DODATEK
Nacionalni dodatek, ki dodatek A Nacionalne razmere dopolnjuje s parametri, ki veljajo v Sloveniji, je
za Slovenijo normativen, za ostale države pa informativen.
Dodatek A: Nacionalne razmere
Naslednje tabele se dopolnijo s parametri, ki veljajo v Sloveniji:
Tabela A.1: Vrste priključkov, ki se uporabljajo v posameznih državah
Oznaka Kategorije I I I Druge kategorije
3B/P, 3+, 3P
države
Z navojem Drugi Z navojem Drugi
priključki iz priključki -
ISO 7-1 EN ISO 228-1 ISO 7-1 EN ISO 228-1
5.1.4 priključek z
olivo
SI da da da da da da
Tabela A.2: Premeri dimniških priključkov, ki se uporabljajo v posameznih državah
Oznaka države Zunanji premeri dimniških priključkov
mm
int. 60 – 70 – 80 – 90 – 100 – 110 – 120 – 130 – 140 – 150 – 160 – 180 – 200
SI
Dodatek B: Uporaba simbolov na aparatih in embalaži
Nacionalni dodatek dopolnjuje dodatek B Uporaba simbolov na aparatih in embalaži z oznako za
Slovenijo.
B.5 Ciljna država
Skladno s SIST EN ISO 3166-1 Kode za predstavljanje imen držav in njihovih podrejenih enot – 1. del:
Kode držav, velja za Slovenijo naslednja koda:
Slovenia SI.
II
SIST EN 203-1 : 2006
ZVEZE S STANDARDI
S privzemom tega evropskega standarda veljajo za omejeni namen referenčnih standardov naslednji
standardi:
SIST EN 88 (en) Tlačni regulator za plinske aparate za vstopne tlake do 200 mbar
SIST EN 125 (en) Naprave za nadzor plamena pri plinskih aparatih –
Termoelektrična varovala
SIST EN 126 (en;de;fr) Večopravilni krmilniki za plinske aparate
SIST EN 161 (en) Samodejni zaporni ventili za plinske gorilnike in plinske aparate
SIST EN 257 (en) Mehanski termostati za plinske aparate
SIST EN 297 (en) Plinski kotli za centralno gretje – Tipa B in B z atmosferskimi
11 11BS
gorilniki z imensko močjo do vključno 70 kW
SIST EN 298 (en;de;fr) Naprave za samodejni nadzor plinskih gorilnikov in plinskih
aparatov z ali brez ventilatorja (gorilniški avtomati)
SIST EN 437:2005 ((sl),en;de;fr) Preskusni plini – Preskusni tlaki – Kategorije naprav
SIST EN 1106 (en) Ročne pipe za plinske aparate
SIST EN 12067-1 (en) Regulatorji razmerja plina in zraka za plinske gorilnike in plinske
aparate – 1. del: Pnevmatski tip
SIST EN 50165 (en) Electrical equipment of non-electric appliances for household and
similar purposes - Safety requirements
SIST EN 60335-1:2003 (en) Household and similar electrical appliances – Safety – Part 1:
General requirements (IEC 60335-1:2001, modified)
SIST EN 60730-2-1 (en) Automatic electrical controls for household and similar use
– Part 2-1: Particular requirements for electrical controls for
electrical household appliances (IEC 60730-2-1:1989, modified)
SIST EN 60730-2-9 (en) Automatic electrical controls for household and similar use – Part
2: Particular requirements for temperatur sensing controls
(IEC 60730-2-9:1992, modified)
SIST EN ISO 228-1 (en) Cevni navoji za zveze, ki ne tesnijo z navoji – 1. del: Mere,
odstopki in oznake (ISO 228-1:2000)
SIST EN ISO 3166-1 (en;fr) Kode za predstavljanje imen držav in njihovih podrejenih enot
– 1. del: Kode držav (ISO 3166-1:1997)
SIST ISO 7-1 (en) Cevni navoji, pri katerih je tesnjenje izvedeno z navojem
– 1. del: Mere, tolerance in označevanje
ISO 301 (en;fr) Zinc alloy ingots intended for casting
PREDHODNE IZDAJE
SIST EN 203-1:1997 ((sl),en)  Plinske naprave za gostinstvo - 1. del: Varnostne zahteve
SIST EN 203-1:1997/A1:1997 ((sl),en) Plinske naprave za gostinstvo - 1. del: Varnostne zahteve –
Dopolnilo A1
SIST EN 203-1:1997/A2:2001 (en) Plinske naprave za gostinstvo - 1. del: Varnostne zahteve –
Dopolnilo A2
III
SIST EN 203-1: 2006
OPOMBI
– Povsod, kjer se v besedilu standarda uporablja izraz “evropski standard”, v
SIST EN 203-1:2005 to pomeni “slovenski standard”.
– Nacionalni uvod in nacionalni predgovor nista sestavni del evropskega standarda.
IV
EUROPEAN STANDARD
EN 203-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2005
ICS 97.040.20 Supersedes EN 203-1:1992
English Version
Gas heated catering equipment - Part 1: General safety rules
Appareils de cuisine professionnelle utilisant les Großküchengeräte für gasförmige Brennstoffe - Teil 1:
combustibles gazeux - Partie 1: Règles générales de Allgemeine Sicherheitsanforderungen
sécurité
This European Standard was approved by CEN on 21 April 2005.
CEN 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 Central Secretariat or to any CEN 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 CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 203-1:2005: E
worldwide for CEN national Members.

Contents
Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions.6
3.1 General .6
3.2 Terminology referring to gases and pressures .6
3.3 General terminology referring to appliance design.7
3.4 Terminology referring to appliance operation.12
4 Classification.14
5 Constructional requirements .15
5.1 General .15
5.2 Particular requirements for components in the gas circuit.20
5.3 Particular requirements.25
6 Performance requirements.26
6.1 Soundness.26
6.2 Obtaining the gas rate .26
6.3 Safety of operation.27
6.4 Influence of burners on each other .29
6.5 Auxiliary equipment.29
6.6 Air proving device.31
6.7 Combustion.31
6.8 Particular requirements.32
6.9 Auxiliary energy .32
6.10 Rational use of energy.33
7 Test conditions .33
7.1 General .33

7.2 Soundness.35
7.3 Obtaining gas rates.36
7.4 Operational safety.39
7.5 Auxiliary equipment.44
7.6 Combustion.46
7.7 Air-proving device.49
7.8 Special tests .50
8 Designation .50
9 Marking and instructions.51
9.1 General .51
9.2 Marking on the appliance .51
9.3 Instructions .52
9.4 Packaging.54
Annex A (informative) National situations.62
Annex B (normative) Use of symbols on appliances and packaging .64
Annex C (informative) Trilingual list of appliances in the scope of EN 203-1 and corresponding Part 2.66
Annex D (normative)  Non pneumatic air/gas control devices.67
Annex E (informative) Composition of the gas circuit.70
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or
other provisions of EU Directives.72

Bibliography.75

Foreword
This document (EN 203-1:2005) has been prepared by Technical Committee CEN/TC 106 “Gas heated catering
equipment”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn at the latest
by December 2008.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
This document supersedes EN 203-1:1992.
Questions relating to quality assurance systems, manufacturing tests and certificates of conformity of ancillary
devices in particular, are not covered by this document.
This European Standard constitutes Part 1 of EN 203 "Gas heated catering equipment". It states the definitions, the
requirements of construction and performance, the test requirements, the requirements of marking applicable to all
professional catering equipment mainly on matters of safety. The particular requirements relative to safety and
rational use of energy for each specific type of appliance is the subject of Part 2: Rational use of energy.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom
1 Scope
This document specifies the general requirements and the constructional and operating characteristics relating to
1)
safety , marking, and the associated test methods for gas heated commercial catering and bakery appliances.
The specific requirements are given in Part 2.
Only appliances of types A , A , A , B and B , as defined in Clause 4, are considered in this document.
1 2 3 1 2
This document applies to all professional cooking and bakery appliances using gas for preparing food and drink.
This document covers type tests only, and only the net calorific value (H ) and net Wobbe number (W ) are used.
i i
Annex C, informative, lists the main types of equipment entering into the field of application of this document.
NOTE This document does not really deal with rational use of energy. This aspect is mentioned in 6.10 only for the
coherency with associated Part 2 (clauses numbering) and to remind that in case of not any Part 2 exist for a specific product,
rational use of energy has however to be considered.
2 Normative references
The following referenced documents 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 88, Pressure governors for gas appliances for inlet pressures up to 200 mbar
EN 125, Flame supervision devices for gas burning appliances – Thermo-electric flame supervision devices.
EN 126, Multifunctional controls for gas burning appliances
EN 161, Automatic shut off devices for gas burners and gas appliances
EN 257, Mechanical thermostats for gas burning appliances
EN 297, Gas-fired central heating boilers – Type B and B boilers fitted with atmospheric burners of nominal
11 11BS
heat input not exceeding 70 kW
EN 298, Automatic gas burner control systems for gas burners and gas appliances with or without fans
EN 437:2003, Test gases – Test pressures – Appliance categories
EN 1106, Manually operated taps for gas burning appliances
EN 12067-1, Gas/air ratio controls for gas burners and gas burning appliances - Part 1: Pneumatic types
EN 50165, Electrical equipment of non-electric appliances for household and similar purposes – Safety
requirements
EN 60335-1:2002, Safety of household and similar electrical appliances – Part 1: General requirements (IEC
60335-1:2001, modified)
EN 60730-2-1, Automatic electrical controls for household and similar use – Part 2-1: Particular requirements for
electrical controls for electrical household appliances (IEC 60730-2-1:1989, modified)

1)
The term "safety" includes not only the safety of the appliance gas line but also that of the overall cooking appliance during

its normal use in catering.
EN 60730-2-9, Automatic electrical controls for household and similar use – Part 2-9: Particular requirements for
temperature sensing controls (IEC 60730-2-9:2000, modified)
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads – Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000)
EN ISO 3166-1, Codes for the representation of names of countries and their subdivision – Part 1: Country codes
(ISO 3166-1:1997)
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads – Part 1: Dimensions, tolerances and
designation
ISO 301, Zinc alloy ingots intended for casting
3 Terms and definitions
3.1 General
For the purposes of this document, the following terms and definitions apply.
3.2 Terminology referring to gases and pressures
3.2.1
reference conditions
15 °C, 1 013,25 mbar
3.2.2
units
calorific value and Wobbe number: (MJ/m );
test pressures: 1 mbar = 10 Pa
3.2.3
gas supply pressure
p
difference between the static pressure measured at the inlet connection of the appliance, with the appliance in
operation, and atmospheric pressure
NOTE Gas supply pressure is expressed in millibars (mbar).
3.2.4
relative density
d
ratio of the masses of equal volumes of dry gas and dry air under the same conditions of temperature and
pressure: 15 °C or 0 °C and 1 013,25 mbar
[EN 437:2003]
3.2.5
calorific value
quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar, of a unit
volume or mass of gas, the constituents of the combustible mixture being taken at reference conditions and the
products of combustion being brought back to the same conditions.
A distinction is made between:
− the gross calorific value H : the water produced by combustion is assumed to be condensed;
s
− the net calorific value H : the water produced by combustion is assumed to be in the vapour state
i
NOTE The calorific value is expressed:
− either in megajoules per cubic metre (MJ/m ) of dry gas under the reference conditions;
− or in megajoules per kilogram (MJ/kg) of dry gas
[EN 437:2003]
3.2.6
Wobbe index
gross Wobbe index W ; net Wobbe index W
s i
ratio of the calorific value of a gas per unit volume and the square root of its relative density under the same
reference conditions. The Wobbe index is said to be gross or net according to whether the calorific value used is
the gross or net calorific value
NOTE The Wobbe indices are expressed:
− either in megajoules per cubic metre (MJ/m ) of dry gas under the reference conditions
− or in megajoules per kilogram (MJ/kg) of dry gas
[EN 437:2003]
3.3 General terminology referring to appliance design
3.3.1 Terminology referring to the gas circuit

3.3.1.1
gas circuit
part of an appliance between the gas inlet connection and the burner(s) which conveys or contains the gas
3.3.1.2
inlet connection
part of the appliance which is intended to be connected to the gas supply
3.3.1.3
mechanical soundness joint (or mechanical means of obtaining soundness)
assembly of several parts, generally metallic, which achieves soundness by use of mechanical means such as
metal-to-metal joints, toroidal sealing rings (O rings) or flat joints
3.3.1.4
restrictor or calibrated orifice
device with one or more orifices that is placed in the path of the gas flow between the appliance inlet connection
and the burner so as to create a pressure drop, and thus reduce the gas pressure at the burner to a predetermined
value for a given supply pressure and rate
3.3.1.5
gas rate adjuster
component which allows the gas input to each burner to be set at a predetermined value according to supply
conditions.
Adjustment may be continuous (screw adjuster) or discontinuous (changing restrictors).
The adjusting device of an adjustable governor is regarded as a gas rate adjuster.
The operation of setting this device is known as “setting the gas rate”
3.3.1.6
gas rate control
tap or equivalent component which allows the gas supply to one or more burners to be opened or closed, and
possibly, the burner or burners to be adjusted to a gas input lower than the nominal rate
3.3.1.7
touch control
indirect manual burner control resulting from finger contact or light touch, with or without movement of the contact
surface
3.3.1.8
indirect control
control that commands a shut-off or gas regulating device via some auxiliary energy (e.g. electric, pneumatic, etc.)
3.3.1.9
primary aeration adjuster
device which allows the aeration of a burner to be set at a desired value, according to the supply conditions.
The operation of changing the setting of the device is called “adjusting the primary aeration”
3.3.1.10
injector
component which admits gas into an atmospheric burner
3.3.1.11
heat bearing fluid
intermediary fluid that directly or indirectly conveys the heat from a burner to the food or cooking container
3.3.2 Terminology referring to the burner

3.3.2.1
atmospheric induction burner
burner in which part of the air necessary for combustion, called primary air, is entrained by the gas flow and is
mixed upstream of the burner. The remainder of the air, called secondary air, is taken up downstream of the burner
3.3.2.2
main burner
burner which affects the heating function of the appliance and is often called simply a “burner”
3.3.2.3
auxiliary burner
burner which allows, by means of an ignition burner or pilot, ignition of a main burner
3.3.2.4
ignition burner or pilot
burner intended to ignite the main burner. If a burner operates independently of the main burners, it is called a
“pilot”
3.3.2.5
alternating ignition burner
ignition burner which goes off as soon as the main burner is ignited and is ignited from the main burner just before
the main burner is extinguished
3.3.2.6
forced draught burner
burner in which the combustion air is introduced by means of a fan
3.3.2.7
pre-mixed burner
burner in which the gas and at least the quantity of air necessary for complete combustion is pre-mixed before the
burner ports
3.3.3
purging
act of forcing air into the combustion circuit to expel any remaining gas/air mixture or products of combustion
Pre-purging is a purging that takes place between the starting demand and the activation of the ignition device
3.3.4
control device for aeration or evacuation of combustion products
device which causes shut-down in the event of abnormal aeration or combustion products evacuation conditions
3.3.5
air/gas ratio device
device which automatically adjusts the combustion air flow to the gas flow and vice versa
3.3.6 Terminology referring to the combustion circuit

3.3.6.1
combustion circuit
circuit including the air supply duct, if it exists, the combustion chamber, the heat exchanger and the combustion
products evacuation duct, if it exists
3.3.6.2
combustion products circuit
circuit including the combustion chamber, the heat exchanger and the combustion products evacuation duct if
exists
3.3.6.3
combustion chamber
enclosure in which the air/gas mixture burns
3.3.6.4
flue outlet
part of an appliance intended to be connected to a combustion products evacuation duct
3.3.6.5
draught diverter
device placed in the combustion products circuit of type B appliances, which is intended to reduce the influence of
the flue pull and down draught on the burner performance and combustion
3.3.6.6
combustion products outlet or flueway extension
part of an appliance not connected to a flue, through which products of combustion are discharged into a room
3.3.6.7
combustion products discharge safety device
device that at least shuts off the main burner when there is an unacceptable spillage of combustion products at the
draught diverter of type B appliances
11BS
3.3.7
auxiliary equipment
all the accessory devices of an appliance which act directly or indirectly on the gas rate: e.g. gas rate control, flame
supervision device, governor, thermostat, etc.
3.3.7.1
ignition device
means used to light gas admitted to the ignition burner or main burner
This can be intermittent or permanent
3.3.7.1.1
intermittent ignition device
means, which may or may not be fixed to the appliance, to assure ignition of the initial flow of gas only to the
ignition burner or main burner
3.3.7.1.2
permanent ignition device
means which, at any time when the gas rate controls are open, assures ignition or re-ignition of the gas admitted to
ignition burners or main burners
3.3.7.2
flame supervision device
device which, on the disappearance of the supervised flame, shuts off the gas supply.
It is described as having “simple control” if it shuts off the gas supply to the main burner only.
It is described as having “complete control" if it shuts off the gas supply to the main burner and to the ignition
burner
3.3.7.2.1
ignition time
time interval between the ignition of the supervised flame and the moment when the force thus produced is
sufficient to keep the valve open
3.3.7.2.2
ignition safety times
3.3.7.2.2.1
ignition safety time (TSA)
time that elapses between the order to open the gas supply to the burner and the gas supply being shut off in the
event no flame has been detected
[EN 297:1994]
3.3.7.2.2.2
maximum ignition safety time (TSA )
MAX
ignition safety time measured under the least favourable conditions of ambient temperature and variation in supply
voltage
[EN 297:1994]
3.3.7.2.3
extinction safety time (TSE)
time that elapses between extinction of the supervised flame and the order to shut off the gas supply to the burner
[EN 297:1994]
3.3.7.2.4
closing time
time interval between the interruption of the auxiliary energy or the voltage and the achievement of the closed
position
[EN 297:1994]
3.3.7.2.5
ignition rate
(Q )
ign
average heat input during the safety time, expressed as a percentage of the nominal heat input
[EN 297:1994]
3.3.7.2.6
spark restoration
automatic process by which, following flame failure, the ignition device is switched on again without total
interruption of the gas supply
[EN 297:1994]
3.3.7.2.7
recycling
automatic process by which, after loss of flame during operation, the gas supply is interrupted and the full start
procedure is re-initiated automatically
[EN 297:1994]
3.3.7.2.8
flame supervision burner
burner which acts on a flame detector
3.3.7.2.9
flame detector
part of the flame supervision device sensing element on which the supervised flame acts directly and transforms
the flame effect into a signal which is transmitted directly or indirectly to a shut off valve
3.3.7.2.10
non-volatile lockout (of the system)
safety shut-down of the system, such that a restart can only be accomplished by manual reset of the system and
by no other means
3.3.7.2.11
volatile lock-out (of the system)
safety shut-down of the system, such that a restart can only be accomplished by either the manual reset of the
system, or an interruption of the electrical supply and its subsequent restoration
3.3.7.2.12
non volatile lock-out (of the burner)
safety shut-down of the burner, such that a restart can only be accomplished by a manual reset of the burner and
by no other means
3.3.7.2.13
volatile lock-out (of the burner)
safety shut-down of the burner, such that a restart can only be accomplished by either a manual reset of the
burner, or an interruption of the electrical supply and its subsequent restoration
3.3.7.3
pressure governor
device which maintains a constant downstream pressure within a fixed range, independent of the upstream
pressure and/or the gas rate
3.3.7.4
temperature regulator (thermostat)
device which controls performance of the appliance (by on/off, on/low or modulating control), maintaining a
predetermined temperature within the given limits of operation
3.3.7.5
overheat limit device
manually reset device which enables temperature to be limited to a predetermined safe value
3.3.7.6
control knob
component which is moved by hand and operates an appliance control (e.g. tap, thermostat, etc.)
3.3.8
working surface
part of the appliance which has to be hot in order for the appliance to fulfil its function.
For specific appliance, this definition is completed in Part 2.
3.3.9
marking
permanent indication on the appliance
3.3.10
display
dynamic indication on the appliance
3.4 Terminology referring to appliance operation
3.4.1 Terminology referring to gas rates

3.4.1.1
heat input,
Q
quantity of energy used in unit time corresponding to the volumetric or mass gas flow rates, the calorific value to be
considered in this document being the net calorific value
NOTE Heat input is expressed in kilowatts (kW).
3.4.1.2
nominal heat input
Q
n
value of the heat input declared by the manufacturer
NOTE Nominal heat input is expressed in kilowatts (kW).
3.4.1.3
mass flow rate
M
mass of gas consumed by the appliance divided by the operating time
NOTE The mass flow rate is expressed in kilograms per hour (kg/h) or grams per hour (g/h).
3.4.1.4
volumetric flow rate
V
volume of the gas consumed by the appliance divided by the operating time, the gas being taken under reference
conditions
NOTE Volumetric flow rate is expressed in cubic metres per hour (m /h), litres per minute (l/m), cubic decimetres per
3 3
hour (dm /h) or cubic decimetres per second (dm /s).
3.4.2 Terminology referring to gas combustion

3.4.2.1
combustion
oxidation phenomena of combustible gases by the oxygen of air, taking place throughout the burners
The combustion may be:
complete; in this case only traces of combustible constituents (hydrogen, carbon monoxide, carbon etc.) remain in
the products of combustion.
or
incomplete; in this case at least one combustible constituent is present in significant proportions in the products of
combustion.
It is the amount of carbon monoxide (CO) in the dry air-free products of combustion which is used as the criterion to
distinguish between complete and incomplete combustion.
The maximum CO limits according to the circumstances of the test are defined in 6.7. In each case, combustion is
regarded as complete (or hygienic) if the CO concentration is below the maximum allowed; if not, it is regarded as
incomplete (or non hygienic).
3.4.2.2
aerated flame
flame produced by the combustion of gas previously mixed with air
3.4.2.3
non-aerated flame
flame produced by the combustion of gas which comes into contact with air at the moment of its combustion
3.4.2.4
flame stability
condition of the flame firmly attached to the burner ports or the contact area provided by the design, with no risk of
flame lift or light back
3.4.2.5
flame lift
phenomenon characterized by the total or partial lifting of the base of the flame from the burner port or the flame
contact area provided by the design. Flame lift may cause the extinction of the flame
3.4.2.6
light back
phenomenon characterized by the return of the flame into the body of the burner
3.4.2.7
light back at the injector
phenomenon characterized by the ignition of the gas at the injector, either as a result of the flame returning into the
burner or by the propagation of a flame around the outside of the burner
3.4.2.8
sooting
phenomenon appearing with incomplete combustion and characterized by the deposit of soot on the surfaces or
parts of the appliance in contact with the products of combustion or with the flame
3.4.2.9
aeration rate
ratio of the air rate entrained at the burner to the minimum air rate necessary for complete combustion
3.4.3
putting an adjuster or control device out of action
procedure by which a control (of temperature, pressure, etc.) is put out of action and sealed in this position. The
appliance then functions as if this device had been removed
3.4.4
sealing an adjuster
procedure by which after setting an adjuster, this one is immobilised by a mean such that any attempt to alter the
adjustment setting is apparent.
A factory sealed pre-set adjuster is considered to be non-existent.
A pressure governor is considered to be non-existent if it has been factory sealed in the fully opened position
3.4.5
nominal vapour pressure
maximum vapour pressure indicated by the manufacturer for the safe use of pressurized parts of the equipment
4 Classification
Appliances are divided:
a) into categories defined according to the nature of the gases and pressures for which they are designed. The
definitions of these categories are given in EN 437. For the national situations see A.3 of this document;
b) into types, according to the method of evacuation of products of combustion and admission of combustion
air.
Only the types of appliances listed after are considered in the scope of this document and are defined as follows
according to CR 1749:
Type A
An appliance not intended for connection to a flue or to a device for evacuating the products of combustion to the
outside of the room in which the appliance is installed.
These appliances shall be installed with sufficient ventilation to prevent the formation of unacceptable
concentrations of substances harmful to health in the room in which they are installed.
This requirement shall be stated in the installation instructions.
Type A : An appliance without a fan.
Type A : An appliance with a fan downstream of the combustion chamber/heat exchanger.
Type A : An appliance with a fan upstream of the combustion chamber/heat exchanger.
Type B
An appliance intended to be connected to a flue that evacuates the products of combustion to the outside of the
room containing the appliance. The combustion air is drawn directly from the room.
Type B : A type B appliance incorporating a draught diverter in the combustion products circuit.
Type B : A natural draught type B appliance.
11 1
Type B : A type B appliance designed for a natural draught flue incorporating a fan downstream of the
12 1
combustion chamber / heat exchanger and upstream of the draught diverter.
Type B : A type B appliance designed for a natural draught flue incorporating a fan upstream of the
13 1
combustion chamber / heat exchanger.
Type B : A type B appliance having an integral fan downstream of both the combustion chamber / heat
14 1
exchanger and the draught diverter.
Type B : A type B appliance without a draught diverter.
Type B : A type B appliance incorporating a fan downstream of the combustion chamber / heat
22 2
exchanger.
Type B : A type B appliance incorporating a fan upstream of the combustion chamber / heat exchanger.
23 2
A supplementary classification for type B appliances is used to clarify the identification of such appliances when
fitted with particular safety devices. The subscript letters “BS” (blocked safety) refer to a combustion products
discharge safety device, which reacts to blockage or restriction of the flue system.
Example:
Type B : A type B appliance fitted with a combustion products discharge safety device.
11BS 11
A type B appliance intended to operate with a pressurized flue duct shall be identified by an extra subscript “P”.
This subscript “P” is only used when installation in accordance with the appliance manufacturer’s instructions on a
flue specified by the appliance manufacturer results in the flue operating at a positive pressure.
5 Constructional requirements
5.1 General
5.1.1 Conversion to different gases
5.1.1.1 General
The only acceptable operations for converting from the gas of one group or family and/or for adapting to the
different supply pressures of a gas are given below for each category.
5.1.1.2 Category I
a) categories I2H, I2L, I2E, I2E+: no adjustment to the appliance may be made;
b) category I3B/P: no adjustment to the appliance may be made;
c) category I3+: change of injectors or restrictors may be made but only to convert from one pressure couple
to another (e.g. 28-30/37 mbar to/from 50/67 mbar). Adjustment of the primary aeration to convert from one
pressure couple to another or to convert from one pressure couple to another within the same pressure
couple can be made;
d) category I3P: for a change of pressure, only a change of injectors, adjustment of gas rates and adjustment
of the primary aeration may be made.
5.1.1.3 Category II
5.1.1.3.1 Categories of appliance designed for use with gases of the first and second families
a) change of injectors or restrictors;
b) adjustment of reduced rate;
c) adjustment of gas rate for first family gases;
d) adjustment of primary aeration;
e) change of complete pilots or some of their parts;
f) adjustment of the governor downstream pressure if exists or putting the governor out of service in
accordance with 5.2.3.3;
g) putting the gas rate adjuster out of service for second family gases.
These adjustments are only permitted for converting from a first family gas to a second family gas or vice versa.
5.1.1.3.2 Categories of appliance designed for use with second and third family gases
a) change of injectors or restrictors;
b) adjustment of reduced rate;
c) adjustment of primary aeration;
d) adjustment of the governor downstream pressure if exists or putting the governor out of service, in
accordance with 5.2.3.3.
e) These adjustments or component changes are only permitted:
f) for converting from a gas of one family to a gas of another family;
g) within the third family, for converting from one gas to another within a pressure couple (e.g. 28-30/37 mbar
to/from 50/67 mbar).
For third family gases, when converting from one gas to another within a pressure couple, only adjustment of
primary aeration is permitted.
5.1.1.4 Category III
The adjustments or component changes permitted for converting from a gas of one family to a gas of another
family, or from converting from one butane/propane pressure couple to another, are as follows:
a) change of injectors or restrictors;
b) adjustment of reduced rate;
c) adjustment of the gas rate for first family gases;
d) adjustment of primary aeration;
e) change of complete pilots or some of their parts;
f) adjustment of pressure downstream of the governor, if it exists, or putting the governor out of service in
accordance with 5.2.3.3;
g) putting the gas rate adjuster out of service for third family gases;
h) within the third family, for converting from one gas to another within a pressure couple (e.g. 28-30/37 mbar
to/from 50/67 mbar).
For third family gases, when converting from one gas to another within a pressure couple, adjustment of primary
aeration only is permitted.
5.1.2 Materials and methods of construction
The materials shall withstand the chemical conditions to which they will foreseeable be subjected.
All the materials used shall withstand the technical, chemical and thermal conditions and be appropriate for their
intended purpose that they do not alter during normal use.
The quality and thickness of the materials used in the construction of the appliance shall be such that the
constructional and operational characteristics are not altered with use (particularly for parts in contact with
combustion products). All parts of the appliance, when installed in accordance with the instructions and accepted
practice, shall withstand the mechanical and thermal actions to which they may be exposed during operation, and
in particular:
- condensation produced at start-up and/or during operation of the appliance shall not affect the safety;
- any corrosion shall not give rise to a disturbance which might affect safety.
In addition, the parts shall be constructed and assembled in such a way that the constructional characteristics are
not altered in the course of normal use and under normal conditions of installation and maintenance.
All pressurized parts of the appliance shall be designed and constructed so that they withstand the mechanical and
thermal conditions to which they are subjected, without this affecting safety.
Materials containing asbestos shall not be used in the construction of the appli
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