prEN 732

SLOVENSKI STANDARD
01-marec-2025
Specifikacije za plinske aparate na utekočinjeni naftni plin - Absorpcijski hladilniki
Specifications for dedicated liquefied petroleum gas appliances - Absorption refrigerators
Festlegungen für Flüssiggasgeräte - Absorber-Kühlschränke
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés
- Réfrigérateurs à absorption
Ta slovenski standard je istoveten z: prEN 732
ICS:
97.040.30 Hladilni aparati za dom Domestic refrigerating
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2025
ICS 97.040.30 Will supersede EN 732:1998
English Version
Specifications for dedicated liquefied petroleum gas
appliances - Absorption refrigerators
Spécifications pour les appareils fonctionnant Festlegungen für Flüssiggasgeräte - Absorber-
exclusivement aux gaz de pétrole liquéfiés - Kühlschränke
Réfrigérateurs à absorption
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 181.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 732:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Classifications . 14
4.1 Classification of gases . 14
4.2 Classification of appliances . 14
5 Constructional and safety characteristics. 15
5.1 Test methods . 15
5.2 Operating with different gases . 15
5.3 Materials . 15
5.4 Cleaning and maintenance . 16
5.5 Strength of the appliance . 16
5.6 Soundness of the gas circuit assembly . 16
5.7 Connections . 17
5.7.1 Gas supply connection. 17
5.7.2 Flue connection for room sealed appliances . 17
5.8 Fixing the appliance . 17
5.9 Taps and controls . 18
5.9.1 General. 18
5.9.2 Taps . 18
5.9.3 Thermostats . 18
5.9.4 Automatic shut-off valves . 18
5.9.5 Multifunctional controls . 18
5.9.6 Governors . 19
5.10 Control handles . 19
5.11 Injectors and by-pass screws . 19
5.12 Ignition device. 19
5.12.1 General. 19
5.12.2 Electrical/electronic ignition device . 19
5.13 Flame supervision device . 19
5.14 Appliance incorporating a gas cylinder/cartridge . 20
5.15 Verification of the nominal and minimum input . 20
5.16 Resistance to overheating . 20
5.17 Temperature of various parts of the appliance . 21
5.18 Temperature of the support, walls or adjacent surfaces . 21
5.19 Temperature of auxiliary equipment . 21
5.20 Overheating/temperature of the LPG cylinder/cartridge and, if applicable, its
compartment . 21
5.20.1 Temperature of housing walls . 21
5.20.2 Overheating of the liquefied petroleum gas cylinder/cartridge, integrated in the
appliance . 21
5.21 Ignition and cross-lighting of the burner . 22
5.22 Flame stability . 22
5.22.1 Flame lift . 22
5.22.2 Light back . 22
5.22.3 Sooting . 22
5.22.4 Draught resistance . 22
5.23 Combustion . 22
5.24 Electrical safety . 22
5.24.1 Electrical equipment . 22
5.24.2 Operational safety . 23
6 Test methods . 23
6.1 General . 23
6.1.1 Test gases . 23
6.1.2 Test pressures. 23
6.1.3 Test conditions . 24
6.1.4 Test installation . 25
6.2 Operating with different gases . 25
6.3 Materials . 25
6.4 Cleaning and maintenance . 25
6.5 Strength of the appliance . 25
6.5.1 General . 25
6.5.2 Design . 25
6.5.3 Soundness test . 25
6.6 Connections . 27
6.6.1 Gas supply connection . 27
6.6.2 Flue connection for room sealed appliances . 27
6.7 Fixing devices . 27
6.8 Taps and controls . 27
6.8.1 Manual Taps . 27
6.8.2 Plug type taps . 27
6.9 Control handles . 27
6.10 Injectors and by-pass screws. 27
6.11 Ignition devices . 27
6.11.1 General . 27
6.11.2 Electrical/electronic ignition device . 27
6.12 Flame supervision devices . 27
6.12.1 Design . 27
6.12.2 Delay times . 27
6.13 Appliance incorporating a gas cylinder/cartridge . 28
6.14 Verification of the input of the burner . 28
6.14.1 General . 28
6.14.2 Verification of nominal heat input . 28
6.14.3 Verification of the minimum heat input . 28
6.15 Resistance to overheating . 28
6.16 Temperature of various parts of appliance . 28
6.16.1 Test conditions . 28
6.16.2 Test method . 29
6.17 Temperature of support, walls and adjacent surfaces . 29
6.17.1 Test conditions . 29
6.17.2 Test method . 29
6.18 Temperature of auxiliary equipment . 29
6.19 Overheating / temperature of the LPG cylinder/cartridge and, if applicable, its
compartment . 29
6.20 Ignition and cross lighting of the burner . 29
6.21 Flame stability . 30
6.21.1 Flame lift . 30
6.21.2 Light back . 31
6.21.3 Sooting . 31
6.21.4 Draught resistance . 31
6.22 Combustion . 33
6.22.1 Test method . 33
6.22.2 Analysis of combustion gases . 34
6.23 Electrical safety . 34
6.23.1 Electrical equipment. 34
6.23.2 Operational safety . 34
7 Marking and instructions . 35
7.1 Appliance marking . 35
7.2 Instructions for installation, use and maintenance . 35
7.2.1 General. 35
7.2.2 Instructions for installation . 36
7.2.3 Instructions for use and maintenance . 36
7.3 Packaging marking . 37
Annex A (informative) National situations . 38
A.1 General. 38
A.2 Categories marketed in the various countries and corresponding pressures . 38
A.3 Types of connection used in various countries . 40
Annex B (normative) Method of calculation of the nominal heat input . 44
Annex C (normative) Additional requirements for appliances intended to be used on boats . 46
C.1 IP Class . 46
C.2 Pulses . 46
C.3 Vibration . 46
C.4 Resistance to corrosion . 46
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426/EC aimed to be covered . 48
Bibliography . 51

European foreword
This document (prEN 732:2025) has been prepared by Technical Committee CEN/TC 181 “Appliances
and leisure vehicle installations using liquefied petroleum gas and appliances using natural gas for
outdoor use”, the secretariat of which is held by AFNOR.
This document is currently submitted to the Enquiry.
This document will supersede EN 732:1998.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Items relating to quality assurance systems, production testing and particularly certificates of
conformity of auxiliary equipment are not covered by this document.
This document does not deal with the refrigeration aspects of the appliances and contains no specific
requirements or tests for this.
The following main changes have been made compared to EN 732:1998:
— editorial changes;
— adaptation of the scope to the application in practice;
— new definition for boat/small craft, caravan, motor caravan, caravan holiday home, leisure
accommodation vehicle, liquefied petroleum gas (LPG), liquefied petroleum gas cylinder, liquefied
petroleum installation, room sealed appliance, flueless appliance, open deck, dayroom, mobile
refrigerating appliance;
— technical changes: vibration tests for appliances intended to be used on boats;
— new Annex B “Method of calculation of the nominal heat input” former Article 6.14.3;
— new Annex C “Construction of Appliances intended to be used on boats for leisure purposes and on-
board ships”;
— rewording of the Annex ZA according to the Gas Appliance Regulation (EU) 2016/426.
1 Scope
This document specifies the requirements for the constructional features, safety and operation, test
techniques and marking of absorption refrigerators using liquefied petroleum gas (referred to the body
text as “appliances”).
This document is applicable to room sealed (Type C ) and flueless (Type A ) as defined in EN 1749,
11 1
refrigerators using gas equipment fuelled by third family gases (LPG) as classified in 4.2.
This document is applicable for:
— mobile refrigerating appliances;
— refrigerating appliances installed in vehicles, caravan, leisure accommodation vehicles for
habitation purposes, boats;
— refrigerating appliances for household and similar use.
NOTE Boats considered in this document are recreational craft covered by European Directive 2013/53/EU.
The gas consumption of absorption refrigerators is of the same order of magnitude as pilots currently
used on other types of burners, maximum being 60 g/h. Consequently, efficiency measurement is not
considered relevant for these appliances and is not covered by this document.
Energy consumption and efficiency are not covered by this document.
This document does not cover the requirements for LPG cylinder/cartridge and their associated
regulators.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 88-1:2022+A1:2023, Safety and control devices for gas burners and gas burning appliances - Part 1:
Pressure regulators for inlet pressures up to and including 50 kPa
EN 125:2022+A1:2024, Flame supervision devices für gas burning appliances — Thermoelectric flame
supervision device
EN 126:2012, Multifunctional controls for gas burning appliances
EN 161:2022, Automatic shut-off valves for gas burners and gas appliances
EN 257:2022+A1:2023, Mechanical thermostats for gas-burning appliances
EN 298:2022, Automatic burner control systems for burners and appliances burning gaseous or liquid
fuels
EN 331:2015, Manually operated ball valves and closed bottom taper plug valves for gas installations for
buildings
EN 437:2021, Test gases - Test pressures - Appliance categories
EN 549:2019+A2:2024, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 751-1:1996, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family
gases and hot water - Part 1: Anaerobic jointing compounds
EN 751-2:1996, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family
gases and hot water - Part 2: Non-hardening jointing compounds
EN 1057:2006+A1:2010, Copper and copper alloys - Seamless, round copper tubes for water and gas in
sanitary and heating applications
EN 1106:2022+A1:2023, Manually operated taps for gas burning appliances
EN 60068-2-6:2008, Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)
EN 60068-2-27:2009, Environmental testing — Part 2-27: Test — Test Ea and guidance: Shock
EN IEC 60068-2-52:2018, Environmental testing - Part 2-52: Tests - Test Kb: Salt mist, cyclic (sodium
chloride solution)
EN IEC 60335-1:2023, Household and similar electrical appliances — Safety — Part 1: General
requirements
EN IEC 60335-2-24:2022, Household and similar electrical appliances — Safety — Part 2-24: Particular
requirements for refrigerating appliances, ice-cream appliances and ice makers
EN IEC 60335-2-25:2021, Household and similar electrical appliances — Safety — Part 2-25: Particular
requirements for microwave ovens, including combination microwave ovens
EN 60335-2-102:2016, Household and similar electrical appliances - Safety - Part 2-102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections
EN 60730-1:2016, Automatic electrical controls for household and similar use: General requirements
(IEC 60730-1:2013 + COOR1:2014+A1:2015)
EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads - Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 7000:2019, Graphical symbols for use on equipment — Registered symbols

As impacted by EN IEC 60335-1:2023/A11:2023.
As impacted by EN IEC 60335-2-24:2022/A11:2022.
As impacted by EN IEC 60335-2-25:2021/A1:2021.
As impacted by EN 60730-1:2016/A1:2019.
As impacted by ISO 7-1:2007, Technical Corrigendum 1:2007.
3 Terms and definitions
For the purposes of this document, the following terms and definitions.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
auxiliary equipment
all controls and devices that can affect the safety of operation of a gas appliance, for example:
— taps
— flame supervision devices
— thermostats
3.2
appearance of yellow tips
phenomenon characterized by the appearance of yellow colouration at the top of the blue cone on
aerated flames
3.3
built-in-appliance
appliance which is intended for permanent fitting into a cupboard or a kitchen unit in a space cut into a
panel or similar
Note 1 to entry: The appliance does not necessarily have a casing on all sides.
3.4
burner
component that allows the gas to burn
Note 1 to entry: It may be one of two types:
— non aerated burner, in which the air for combustion is entrained entirely at the burner outlet;
— aerated burner, in which part of the air for combustion, termed primary air, is entrained by the gas
flow and mixed before the burner outlet. The remainder of the air, termed secondary air, is drawn in after the
burner outlet.
3.5
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
Note 1 to entry: A distinction is made between:
— the gross calorific value Hs: the water produced by combustion is assumed to be condensed;
— the net calorific value Hi: the water produced by combustion is assumed to be in the vapour state.
Note 2 to entry: 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.
Note 3 to entry: For the purposes of this European Standard only the gross calorific value is used.
[SOURCE: EN 437:2021, term 3.12 modified with additional note 3]
3.6
control handle
component intended for manual use to control the opening and closing, totally or partially, of a valve
3.7
detachable
which can be dismantled without using a tool
3.8
feed piping
piping intended for distribution of gas to the burner
3.9
flame lift
phenomenon characterized by the partial or total movement of the base of the flame away from the
burner port
[SOURCE: EN 497:2022, term 3.28]
3.10
flame supervision device
device which, due to the presence of a flame on the sensing element, keeps open the gas flow to the
burner and pilot and which cuts off the gas supply to the burner and pilot in the case of extinction of the
supervised flame
[SOURCE: EN 497:2022, term 3.7]
3.11
gas rate adjuster
device allowing gas rate to a burner to be set at a predetermined value according to the supply
conditions
Note 1 to entry: The adjustment can be continuous (adjustment screw) or discontinuous (changing the
calibrated orifices, …).
Note 2 to entry: The operation of changing the setting of this device is termed the “adjustment of the gas rate”.
3.12
gas supply pressure
difference between the static pressure measured at the gas inlet to the appliance and the atmospheric
pressure
3.13
heat input
Q
quantity of energy used in unit time corresponding to the volume flow rate or mass flow rate, the
calorific value used being either the net or gross calorific value
Note 1 to entry: The heat input is expressed in kilowatts (kW).
[SOURCE: EN 437:2021]
3.14
ignition device
device to ignite one or more burners directly or indirectly, for instance through a flash tube
Note 1 to entry: It may be: either electric (resistance, spark, etc.) or thermal (flame, pilot, etc.).
[SOURCE: EN 497:2022, term 3.6]
3.15
injector
component par that admits the gas into an aerated and sealed combustion burner
Note 1 to entry Injector considered in this standard are calibrated injectors where the section of the outlet
orifice is fixed.
3.16
light back
phenomenon characterized by the return of the flame inside the body of the burner
[SOURCE: EN 497:2022, term 3.30]
3.17
mass flow rate
M
mass of gas consumed by the appliance in unit time during continuous operation
Note 1 to entry: The mass flow rate is expressed in kilograms per hour (kg/h) or grams per hour (g/h).
[SOURCE: EN 437:2021, terms 3.16]
3.18
means of sealing
any static or dynamic device designed to ensure soundness
Note 1 to entry: For example: flat-faced joints, O-ring joints, conical joints, diaphragms, grease, pastes, putties….
3.19
nominal heat input
Qn
value of the heat input of the appliance declared in the instructions
Note 1 to entry: Adapted from EN 437:2021, term 3.13.
3.20
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
[SOURCE: EN 437:2021, term 3.11]
3.21
removable
which can only be removed with a tool
3.22
restrictor
device having a calibrated orifice which is places in the gas circuit between the inlet of the appliance
and the burner, in such a way to create a pressure loss and thus bring down the gas pressure at the
burner to a pre-determined value
3.23
sealing of an adjuster/governor
any arrangement relating to the adjuster whereby any change to the adjustment causes breaking of the
sealing device and makes interference with the adjuster apparent
Note 1 to entry: The adjuster is said to be sealed in the adjusted position.
Note 2 to entry: A factory-sealed adjuster is regarded as non-existent.
3.24
soft solders
solder for which the lowest temperature of the melting range after application, is less than 450 °C
3.25
stability of flames
condition of flames when the phenomena of flame lift or light back do not occur
3.26
tap
device designed to open or close the gas supply to a burner and eventually to adjust its rate during use
3.27
thermostat
component intended to maintain sensible constant temperatures automatically
3.28
volume flow rate
V
volume of gas passed in unit time expressed in cubic metres per hour or in litres per hour (cubic
decimetres per hour)
3.29
Wobbe index
gross Wobbe index
W ;
s
net Wobbe index
W
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
Note 1 to entry: The Wobbe index is said to be gross (Ws) or net (Wi) according to whether the calorific value
used is the gross or net calorific value, respectively is used.
Note 2 to entry: The Wobbe index 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.
[SOURCE: EN 437:2021, term 3.13 modified to comply with CEN rules for definition wording]
3.30
boat
small craft
recreational boat, and other watercraft using similar equipment, of up to 24 m length of hull (L )
h
Note 1to entry: The measurement methodology for the length of hull (Lh) is defined in ISO 8666:2020.
[SOURCE: ISO 8666:2020, term 3.15, modified – Note 1 to entry has been added]
3.31
caravan
trailer leisure accommodation vehicle that meets the requirements for the construction and use of road
vehicles
[SOURCE: EN 13878:2019, term 3.5]
3.32
motor caravan
self-propelled leisure accommodation vehicle that meets requirements for construction and use of road
vehicles
Note 1 to entry It contains at least:
— seats and table,
— sleeping accommodation which can be converted from the seats,
— cooking facilities and
— storage facilities.
Note 2 to entry Definition adapted from EN 13878:2003.
[SOURCE: EN 13878:2019, term 3.24]
3.33
caravan holiday home
transportable leisure accommodation vehicle that does not meet requirements for construction and use
of road vehicles, that retains means for mobility and is for temporary or seasonal occupation
[SOURCE: EN 13878:2019, term 3.6]
3.34
leisure accommodation vehicle
unit of living accommodation for temporary or seasonal occupation that may meet requirements for
construction and use of road vehicles
3.35
liquefied petroleum gas (LPG)
mixture of light hydrocarbons, gaseous under conditions of normal temperature and pressure and
maintained in the liquid state by increase of pressure or lowering of temperature
Note 1 to entry: The principal components are propane, propene, butane and butene.
[SOURCE: EN 624:2011, term 3.1.7]
3.36
liquefied petroleum gas cylinder
portable container for liquified petroleum gas at above atmospheric pressure
[SOURCE: EN 13878:2019, term 3.21]
3.37
liquefied petroleum gas installation
installation usually consisting of fuel container(s), pressure regulator(s), piping, hose assemblies and
shut-off devices, providing liquefied petroleum gas in gaseous phase to appliances
[SOURCE: EN 1949:2021, term 3.8]
3.38
room-sealed appliances
appliances that hat the combustion system, including the air inlet and products outlets, isolated from
the internal habitation volume
[SOURCE: EN 13878:2019, term 3.33]
3.39
flueless appliances
appliances not intended for connection to flue or to a device for evacuation the combustion product to
the outside of the room in which the appliance is installed
[SOURCE: EN 1749:2020, Type A]
3.40
open deck
area which is exposed to marine environment
[SOURCE: EN IEC 60335-2-25:2021 , term BB 3.1.201]
3.41
dayroom
area that may be exposed to marine environment from time to time, but usually used inside the cabin
[SOURCE: EN IEC 60335-2-25:2021 , term BB 3.202]
3.42
mobile refrigerating appliance
appliance that is intended to be moved while in operation or operated on various areas and that can
also be used where there is no access to the mains electricity grid
4 Classifications
4.1 Classification of gases
Gases are classified into families, groups and ranges in accordance with EN 437:2021.
NOTE According to EN 437:2021, the third family, grouping liquefied petroleum gases, covers Wobbe indexes
3 3
between 72,9 MJ/m and 87,3 MJ/m (Ws at 15 °C and 1 013,25 mbar). It is subdivided into three groups, group P
3 3
which covers the range of Wobbe indexes between 72,9 MJ/m and 76,8 MJ/m , group B/P which covers the range
3 3
of Wobbe indexes between 72,9 MJ/m and 87,3 MJ/m and group B which covers the range of Wobbe indexes
3 3
between 81,8 MJ/m and 87,3 MJ/m .
Groups P, B/P and B are not considered independently by this document.
4.2 Classification of appliances
Appliances are classified into categories in accordance with EN 437:2021.
NOTE 1 However, for each country, only some of the categories mentioned below are applicable, on account of
local gas supply conditions (types of gas and supply pressures).
NOTE 2 The gas supply conditions and types of connection are given in Annex A.
Appliances within the field of application of this standard belong to the following categories:
Category I
3B/P(30)
Appliance capable of using third family gases (propane, butane or their mixtures), without adjustment
at nominal operating at the prescribed gas supply pressure from 28 mbar to 30 mbar;
Category I
3B/P(50)
Appliance capable of using third family gases (propane, butane or their mixtures), without adjustment
at nominal operating at the prescribed gas supply pressure of 50 mbar;
Category l
3+(28-30/37)
Appliance capable of using third family gases (butane and propane) and operating without adjustment
on the appliance using a pressure couple. For butane, appliances in this category may be used without
adjustment at the prescribed gas supply pressure from 28 mbar to 30 mbar, for propane they are used
at a gas supply pressure of 37 mbar;
Category I
3P
Appliance appliances using only gases of group P of the third family (propane) at the prescribed supply
pressure.
5 Constructional and safety characteristics
5.1 Test methods
The test methods for verifying the compliance of the appliance to the requirements of this clause are
indicated in Clause 6.
5.2 Operating with different gases
The appliance shall operate under normal supply conditions (type of gas and corresponding supply
pressure) specified in the instructions for use, without requiring any intervention on the internal gas
circuit or the adjuster of the appliance.
Adjusters and governors, if used, shall be locked and sealed.
5.3 Materials
The quality and thickness of material used in the construction of an appliance and the assembly method
of different components shall be such that the characteristics of construction and performance are not
altered under the normal conditions of installation and use.
In particular, all parts of the appliance shall withstand the mechanical, chemical and thermal conditions
to which they may be submitted during their use when installed in compliance with the technical
documentation.
In intended conditions of use, cleaning and maintenance, the material shall not be liable to any
alterations which might impair their performance or safety.
Sheet metal parts not made of corrosion resistant material shall be covered with an effective protection
against corrosion, or have a minimum thickness of 1 mm.
Feed piping shall be metallic but not of aluminium or brass. Copper tubes shall be internally supported
by a steel insert at the point of connection when an olive compression fitting is used.
Materials containing asbestos shall not be used in the construction of appliance.
If elastomeric materials are use
...