Bsi bs en 01596 1998 (2004)

Unknown BRITISH STANDARD BS EN 1596 1998 Incorporating Amendment No 1 Specification for dedicated liquefied petroleum gas appliances — Mobile and portable non domestic forced convection direct fired a[.]

The European Standard EN 1596:1998, with the incorporation of

amendment A1:2004, has the status of a British Standard

ICS 91.140.20

This British Standard, having

been prepared under the

direction of the Engineering

Sector Committee, was

published under the authority

of the Standards Committee

and comes into effect on

The British Standards which implement international or European

publications referred to in this document may be found in the BSI Catalogue

under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of British

— aid enquirers to understand the text;

— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the

Amendments issued since publication

Amd No Date Comments

14916 12 May 2004 See national foreword

Descriptors: heaters, gas appliances, pressure equipment, liquefied petroleum gases, mobile equipment, portable equipment, definitions,

classifications, safety, specifications, tests, marking, technical notices, name plates

English version

Specification for dedicated liquefied petroleum gas appliances — Mobile and portable non-domestic forced

convection direct fired air heaters

(including amendment A1:2004)

Spécifications pour les appareils fonctionnant

exclusivement aux gaz de pétrole liquéfiés —

Générateurs d'air chaud à gaz, non domestiques,

à chauffage direct et convection forcée, mobiles et

portatifs

(inclut l'amendement A1:2004)

Festlegungen für Flüssiggasgeräte — Ortsveränderliche und tragbare, nicht für den Hausgebrauch bestimmte Warmlufterzeuger ohne Warmeaustausher mit erzwungener Konvektion (enthält Änderung A1:2004)

This European Standard was approved by CEN on 23 May 1998, and amendment A1 was approved by

CEN on 24 December 2003

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 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 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

E ur op ea n Co mmitt ee fo r Standard ization

Co mité Eur o p éen d e Nor malisatio n

E ur op ä i sc he s Ko mi t e e für N or mu ng

Central Secrétariat: rue de Stassart, 36, B-1050 Brussels

Foreword

This European Standard has been prepared by Technical Committee CEN/TC 181, Dedicated liquefied

petroleum gas appliances, the Secretariat of which is held by NSAI

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 1998, and conflicting national standards shall be withdrawn at the latest by December 1998

This European Standard 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 standard

Particular attention should be paid to the suitability of non-metallic materials used in the construction

of these appliances A European Standard for “Flexible hose, tubing and assemblies for use with propane and butane in the vapour phase” is being prepared by CEN/TC 218 These standards will be applicable to these types of appliances

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,

Portugal, Spain, Sweden, Switzerland and the United Kingdom

Foreword to amendment A1

This document (EN 1596:1998/A1:2004) has been prepared by Technical Committee CEN/TC 181,

Dedicated liquefied petroleum gas appliances, 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 September 2004, and conflicting national standards shall be withdrawn at the latest by September 2004

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

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 the United Kingdom

Contents Page

Foreword 2

1 Scope 6

2 Normative references 7

3 Definitions 8

4 Classification 13

4.1 Classification of gases 13

4.2 Classification of low pressure appliances 14

4.3 Classification of medium pressure appliances 15

5 Safety and constructional requirements 15

5.1 General 15

5.2 Conversion to different gases 16

5.3 Materials 16

5.4 Cleaning and maintenance 16

5.5 Strength of assembly 16

5.6 Soundness of the gas circuit assembly 17

5.7 Connections 17

5.8 Appliance stability, transport and mobility devices 18

5.9 Taps and controls 18

5.10 Control handles 19

5.11 Injectors 20

5.12 Ignition devices 20

5.13 Safety devices 21

5.14 Facility for remote control 25

5.15 Thermostats and control of air temperature 25

5.16 Electrical equipment 26

5.17 Operational safety in the event of failure of auxiliary energy 26

5.18 Motors and fans 26

5.19 Heat inputs 26

5.20 Overheating of the LPG cylinder and, where applicable, its compartment 27

5.21 Temperature of various parts of the appliance 27

5.22 Floor temperatures 28

5.23 Temperature of taps and components 28

5.24 Air delivery temperatures 28

5.25 Ignition 28

5.26 Crosslighting 30

5.27 Flame stability 30

5.28 Flame length 31

5.29 Combustion 31

5.30 Operation safety 31

6 Test conditions and methods 31

6.1 General 31

6.2 Conversion to different gases 35

6.3 Materials 35

6.4 Cleaning and maintenance 36

6.5 Strength of assembly 36

6.6 Soundness of the gas circuit assembly 36

6.7 Connections 37

6.8 Appliance stability, transport and mobility devices 37

6.9 Taps and controls 37

6.10 Control handles 37

6.11 Injectors 37

6.12 Ignition devices 37

6.13 Safety devices 37

6.14 Facility for remote control 40

6.15 Thermostats and control of air temperatures 41

6.16 Electrical equipment 41

6.17 Operational safety in the event of failure of auxiliary energy 41

6.18 Motors and fans 41

6.19 Heat inputs 41

6.20 Overheating of the LPG cylinder, and where applicable, its compartment 44

6.21 Temperatures of various parts of the appliance 44

6.22 Floor temperatures 45

6.23 Temperatures of taps and components 45

6.24 Air delivery temperatures 45

6.25 Ignition 46

6.26 Crosslighting 47

6.27 Flame stability 48

6.28 Flame length 48

6.29 Combustion 48

6.30 Operational safety 49

7 Marking and instruction literature 49

7.1 General 49

7.2 Data plate 50

7.3 Other markings 50

7.4 Instructions for use and user maintenance 51

7.5 Servicing instructions 52

7.6 Packaging 53

Figure 1 — Apparatus for the measurement of the increase of vapour pressure 54

Figure 2 — Measurement of air delivery temperatures 55

Figure 3 — Sample probe 56

Figure B.1 — Nozzles 59

Figure B 2 — Threaded union connector 62

Table 1 — Classification of gases 14

Table 2 — Maximum allowable pressure increase inside the LPG cylinder 27

Table 3 — Test gases corresponding to the categories of appliances 32

Table 4 — Characteristics of test gases 33

Table 5 — Test pressures (low pressure appliances) 34

Table 6 — Test pressures (medium pressure appliances) 35

Table 7 — Test gases and pressures for ignition tests 46

Table 8 — Test gases and pressures for crosslighting tests 47

Table 9 — Carbon dioxide produced by test gases 49

Annex A (informative) Air supply and ventilation 57

Annex B (normative) Special national conditions 58

Annex ZA (informative) Correspondence between this standard and EC Directive 90/396/EEC 61

1 Scope

This standard defines, for the purpose of type examination, the construction, the safety

characteristics, the test methods and the marking of mobile and portable non-domestic forced

burning third family gases, referred to in the body of the text as “appliances”

This standard covers the following type of mobile and portable non-domestic forced

convection direct fired air heaters of type A3 (see CR 1749) fitted with an integral burner intended for use in other than residential dwellings:

a) low gas pressure appliances operating at pressures up to and including 50 mbar burning commercial butane and/or commercial propane;

b) medium gas pressure appliances operating at pressures above 50 mbar and up to

!2 bar" burning commercial butane and/or commercial propane

It does not apply to appliances which are intended to be fixed or permanently installed, or to appliances which incorporate liquid feed burners

Requirements for appliances given in this standard assume that the supply of gas from the gas cylinder will be governed by a pressure regulator These appliances are not equipped with an appliance governor

2 Normative references

This European Standard incorporates, by dated or undated reference, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions

of any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies

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 valves for gas burners and gas appliances

EN 257, Mechanical thermostats for gas-burning appliance

EN 298, Automatic gas burner control systems for gas burners and gas burning appliances

with or without fans

EN 437, Test gases — Test pressures — Appliance categories

prEN 1106, Manually operated taps for gas burning appliances

EN 50165, Electrical equipment of non-electric appliances for household and similar

purposes — Safety requirements

EN 60529, Degrees of protection provided by enclosures (IP Code)

(IEC 60529:1989)

EN 60335-1, Safety of household and similar electrical appliances — Part 1: General

requirements

(IEC 60335-1:1991, modified)

EN 60730-2-1, Automatic electrical controls for household and similar use —

Part 2: Particular requirements for electrical controls for electrical household appliances

(IEC 60730-2-1:1989, modified)

EN 60730-2-9, Automatic electrical controls for household and similar use —

Part 2: Particular requirements for temperature sensing controls

(IEC 60730-2-9:1992, modified)

IEC 34-5, Rotating machines — Part 5: Classification of degrees of protection provided by

enclosures of rotating electrical machines

CR 1749, European scheme for the classification of gas appliances according to the method of

evacuation of the products of combustion (types)

3 Definitions

For the purpose of this standard the following definitions apply

3.1

air proving device

device which monitors and proves the existence of an adequate flow of air for combustion and, where appropriate, for dilution

3.2

automatic burner control system

system that comprises a programming unit and all the elements of a flame detector All the functions of an automatic burner control system may be assembled in one or more housings

3.3

auxiliary equipment

auxiliary equipment includes timers, thermostats etc

3.4

air delivery temperature

maximum temperature of outlet air measured in an arc of 1,5 m from the appliance outlet

3.4.1

space heating appliance

appliance whose air delivery temperature does not exceed the ambient by more than 80 K

3.4.2

commercial drying appliance

appliance whose air delivery temperature may exceed the ambient by more than 80 K These appliances are intended for purposes other than space heating

appliance in which the necessary steps to achieve ignition and operation are controlled

separately by the operator

gross calorific value (Hs)

quantity of heat produced by the combustion, at constant pressure, of unit volume or mass of the considered gas, the water produced by the combustion being condensed It is expressed in

to 1 kg of dry gas

3.10

cold condition

condition of the appliance required for some tests and obtained by allowing the unlit appliance

to attain equilibrium at room temperature

direct fired air heater

air heater in which the products of combustion mix with the heated air being supplied to the space

3.14

extinction delay time

for a thermoelectric flame supervision device, the time that elapses between disappearance of the supervised flame and the interruption of the gas supply

3.15

extinction safety time

for automatic burner control units, the time that elapses between extinction of the supervised flame and the signal to shut-off the gas supply to the burner

flame supervision device

device including a sensing element which causes the gas supply to a burner to be opened or closed according to the presence or absence of the flame which activates the sensing element

3.18

gas circuit

assembly of parts of the appliance that carry or contain the combustion gas between the

appliance gas inlet connection and the burner

3.19

gas inlet connection

part of the appliance intended to be connected to the gas supply

3.21

gas rate adjuster

device allowing the gas rate to a burner to be set at a predetermined value according to the supply conditions It often consists of a screw, termed a “throttle screw” or an “adjustment screw” The operation of changing the setting of this device is termed the “adjustment of the gas rate” The adjustment screw of a variable regulator is regarded as a gas rate adjuster

!In this case the data plate and the instructions should state the limits of the range rate"

3.22

gas supply pressure

difference between the static pressure measured at the inlet connection of the appliance and the atmospheric pressure

condition of the appliance required for some tests and obtained by heating to thermal

equilibrium at the nominal heat input specified by the manufacturer, any thermostat remaining fully open

3.25

ignition device

any means (flame, electrical ignition device or other device) used to ignite the gas at the

ignition burner or at the main burner This device can operate intermittently or permanently

3.26

ignition opening time

for thermoelectric flame supervision devices, the time that elapses

between ignition of the supervised flame and the moment when the closure element is held open by the flame signal

ignition safety time

for automatic burner control units, the time that elapses between the signal to open and the order to close the gas supply in the burner in the event of ignition not taking place

3.29

injector

component that admits the gas into an aerated burner

self-contained heater for connection to a gas supply by means of flexible tubing and designed

to be moved without lifting

3.34

nominal heat input of burner

value of the heat input of the burner, as declared by the manufacturer at the nominal operating pressure

Unit: kilowatt

3.35

overheat cut-off device

device that causes safety shutdown and non-volatile lockout so as to prevent the air

temperature exceeding a preset limit

3.39

primary air adjuster

device allowing the aeration of a burner to be set at a predetermined value according to the supply conditions The operation of changing the setting of this device is termed the

“adjustment of primary air”

3.40

putting a control out of service

action whereby a control (of temperature, pressure, etc.) is put out of action and then sealed in this position The appliance then functions as if this device had been removed

ratio of the mass of a volume of dry gas to an equal volume of dry air under the same

temperature and pressure conditions

3.45

restrictor

device with a calibrated orifice which is placed in the gas circuit to create a pressure loss and thus reduce the gas pressure at the burner to a predetermined value, for a given supply pressure and rate

3.47

sealing an adjuster

action whereby the locking of an adjuster is achieved by a means such that any attempt to change the adjustment makes the interference with the adjuster apparent (e.g breaking of a sealing material)

3.48

setting and locking an adjuster

action whereby an adjuster, after having been set by the manufacturer is immobilized in this position by an effective means (screw, plug etc.)

sound mechanical joint

connection device assuring gas soundness in an assembly made up of several parts, generally of metal

It may be:

a conical joint;

an O-ring joint;

a flat-faced joint;

a nut and olive joint;

a cone seated union;

a flat-faced washered union

where Hs is the gross calorific value of a gas expressed in megajoules per cubic metre, and d is

its relative density

direct country of destination

country for which the appliance has been certified and which is specified by the manufacturer

as the intended country of destination At the time of putting the appliance on the market and/or installation, the appliance shall be capable of operating, without adjustment or

modification, with one of the gases distributed in the country concerned, at the appropriate supply pressure More than one country can be specified if the appliance, in its current state of adjustment, can be used in each of these countries

3.58.2

indirect country of destination

country for which the appliance has been certified, but for which, in its present state of

adjustment, is not suitable Subsequent modifications or adjustments are essential in order that

it can be utilized safely and correctly in that country

self-contained heater for connection to a gas supply by means of flexible tubing and designed

to be moved by using special equipment

4 Classification

4.1 Classification of gases

Gases are classified in families according to the value of their Wobbe number, in accordance with EN 437, as shown in Table 1

Table 1 — Classification of gases

MJ/m3 (Hs)

4.2 Classification of low pressure appliances

Low pressure appliances are classified into categories according to the gases that they are designed to use, in accordance with EN 437 However, for each country, only some of the categories defined hereafter are applicable, on account of local gas distribution conditions (types of gas and supply pressures) For these categories, requirements different from those defined in this standard shall not be specified

NOTE Table B.1, Table B.2 and Table B.3 identify the gas distribution conditions and types of connection applicable to each country

This specification only covers appliances of the following categories

to 30 mbar, for propane they are used at a normal supply pressure of 37 mbar

d) Category I3P(30)

An appliance capable of using third family gases in group P (propane), without adjustment,

at a normal supply pressure of 30 mbar

e) Category I3P(37)

An appliance capable of using third family gases in group P (propane), without adjustment at

a normal supply pressure of 37 mbar

f) Category I3P(50)

An appliance capable of using third family gases in group P (propane), without adjustment at

a normal supply pressure of 50 mbar

4.3 Classification of medium pressure appliances

Medium pressure appliances are classified into categories according to the gases that they are designed to use i.e I3 B/P, I3P

NOTE For the purposes of this standard, a similar method of classification as used in 4.2 has been applied to

medium pressure appliances

5 Safety and constructional requirements

5.1 General

Except where otherwise stated the construction requirements shall be verified by the inspection

of the appliance and its instruction literature The safety requirements shall be checked in

accordance with Clause 6

There shall be no provision for adjustment of parts of the appliance which have been set by the manufacturer

Primary air and gas rate adjusters shall be preset by the manufacturer and shall not be capable

of being changed

5.2 Conversion to different gases

The appliance shall be supplied for a single gas category and for a single operating pressure or pressure couple or pressure range Conversion to another category or pressure or pressure couple shall not be possible

Materials containing asbestos shall not be used

Copper tubing shall not be used where it would be exposed to temperatures in excess

of 100 C

Any thermal or acoustic insulation shall be securely located and shall be protected against mechanical damage and shall be non-combustible

5.4 Cleaning and maintenance

Any part of the appliance requiring cleaning by the user shall be easily accessible without having to move the appliance or use a tool for dismantling It shall be possible to replace such parts correctly and without difficulty, and shall be difficult to reassemble such parts incorrectly Sharp borders and edges which could give rise to injury, for example during cleaning and maintenance, shall be avoided

Any control placed in the gas circuit shall be arranged so that any adjustment or maintenance

by a competent person is easy and so that its exchange by him is possible

5.5 Strength of assembly

The construction of an appliance shall be such that, during normal conditions of use,

maintenance or movement, any displacement, distortion or deterioration of parts likely to impair its safety will not occur

5.6 Soundness of the gas circuit assembly

5.6.1 General

Holes for screws, pins, etc intended for the assembly of components shall not open into the gas ways The wall thickness between drillings and gas ways shall be at least 1 mm This does not apply to orifices for measurement purposes

The soundness of assemblies connected to the gas circuit shall be assured, by means of

metal-to-metal joints or joints with seals (e.g washers, O-rings or gaskets)

For parts that do not require to be dismantled during normal maintenance, for example taps and injectors, the use of thread sealing compounds is permitted

Soft solder shall not be used to ensure the soundness of the connections of the gas circuit Removable components or the threaded parts of the pipe work which may be dismantled during normal maintenance are considered to be sound if they stay sound after five disconnections, if necessary after changing a gasket, where such exists

5.6.2 Soundness test

5.6.2.1 Low pressure appliances

Under the test condition specified in 6.6.2.1, the leak detected shall not exceed 0,10 dm3/h

5.6.2.2 Medium pressure appliances

Under the test condition specified in 6.6.2.2 the leak detected shall not exceed 0,10 dm3/h These requirements shall also be satisfied after all the appliance tests have been carried out but before any of the components used in the soundness tests have been removed

b) with a cone seated union, or a flat-faced washered union, or threaded union,

attached to a flexible tube

The special “national conditions” for connections are given in Table B.3

5.8 Appliance stability, transport and mobility devices

5.8.1 Transportable appliances

The appliance shall be so constructed as to allow for safe transportation To ensure this

transport handles, hooks or rings shall be part of the appliance Any transport rings shall have a minimum inner diameter of at least 60 mm

5.8.2 Mobile and portable appliances

When tested in accordance with 6.8.2 the appliance shall not tip over when inclined in all

directions at an angle of 158 to the horizontal

When the appliance incorporates a gas cylinder the test shall be carried out in turn with all of the manufacturer's recommended sizes of gas cylinder fitted The test is carried out with the gas cylinder both empty and full

5.8.3 Mobility devices

Appliances incorporating wheels or castors shall have means to prevent accidental movement when in use Wheels, castors and their mountings shall be sufficiently robust to support the mass of the appliance and a full gas cylinder if incorporated

5.9 Taps and controls

5.9.1 General

The appliance shall be fitted with such taps and controls as are essential for the normal

operation of the appliance by the user and shall be in an easily accessible position

Taps and controls shall be placed in such a way that their strength, operation, manipulation and accessibility undergo no damage from actions to which they are subjected in normal use, and they shall be protected against external clogging

Taps shall be mounted in such a way that no accidental movement relative to the gas supply connection is possible Taps shall be individually replaceable

It shall be possible to dismantle the parts of a tap as far as necessary for its maintenance

Control handles shall be so designed that they can neither be fitted in the wrong position nor move by themselves The shape of a handle shall be such that its grip makes manipulation easy

If control handles operate by turning, the closing direction shall be clockwise

The manipulation of control handles shall not cause inadvertent movement of the appliance

5.10.2 Marking

5.10.2.1 Taps with fixed positions

The closed, open and, if applicable, reduced rate positions shall be marked in a visible, legible and durable fashion

The closed position of the tap shall be marked by a full disc at least 3 mm in diameter It shall

be the same for all the taps on a single appliance

The identification of the closed position of each tap shall not give rise to any possibility of confusion with the identification of an open position

Any special position of the tap intended for ignition, and/or any special button that has to be operated to cause ignition shall be clearly marked (e.g by a star)

The positions shall be identified unambiguously preferably using the following symbols:

— reduced rate position: a small flame

Additional markings are permitted provided that they do not create confusion for the appliance user

5.10.2.2 Taps with variable positions

For taps with variable positions, the closing direction shall be marked by an arrow whose tip points to a full disc For example:

Additional markings are permitted provided that they do not create confusion for the appliance user

5.11 Injectors

Injectors shall be removable

Injectors shall carry an indelible means of identification preferably the diameter of the orifice expressed in hundredths of a millimetre

Adjustable injectors shall not be used

5.12 Ignition devices

An ignition device shall be fitted It shall ensure rapid and smooth ignition

All the components of the ignition device shall be designed to avoid damage or accidental displacement in use The relative positions of the ignition device and the burner shall be

sufficiently well defined to ensure satisfactory operation of the assembly

5.13 Safety devices

5.13.1 General

The functioning of any internally or externally fitted control device shall not override the action

of any safety device

5.13.2 Flame supervision devices

A flame supervision device shall be fitted to all appliances

The presence of a flame shall be detected by either:

— a thermoelectric flame supervision device; or

— a flame detector of an automatic burner control system

At least one flame detector is required

If the main burner is ignited by an ignition burner the presence of a flame at the ignition burner shall be detected before gas is allowed to pass to the main burner

5.13.2.1 Manual appliances

The thermoelectric flame supervision device shall comply with EN 125 It shall only be fitted

to manual appliances with a rated heat input of less than 120 kW It shall be so mounted as to ensure satisfactory performance The sensing element of a flame supervision device shall control a single burner only

The device shall cause non-volatile lock-out of the appliance in the event of flame failure, or in the event of damage to the sensing element or the connection between the sensing element and the device responding to its signal

The device shall incorporate either an ignition interlock or a restart interlock

The appliance shall not incorporate any device that allows the flame supervision device to be over-ridden, however during the lighting operation, a temporary supply of gas, in the absence

of flame, is allowed under the conditions of test described in 6.13.2.1.1

5.13.2.1.1 Ignition opening time

Under the test conditions of 6.13.2.1.1 the ignition opening time of a thermoelectric flame

supervision device shall not exceed 20 s

5.13.2.1.2 Extinction delay time

Under the test conditions of 6.13.2.1.2 the extinction delay time of a thermoelectric flame

supervision device shall not exceed !25 s"

5.13.2.2 Automatic appliances

The automatic burner control system shall comply with EN 298, except for the degree of

electrical protection, endurance, marking and instructions

Automatic shut-off valves shall comply with EN 161

Upon flame failure the flame supervision device shall cause non-volatile lock-out There shall

be no attempt to at re-ignition by spark restoration, automatic recycling or other means

A restart cycle shall occur only after manual reset

5.13.2.2.1 Ignition safety time

The maximum ignition safety time is specified by the manufacturer

If the nominal heat input of the ignition burner is not greater than 0,25 kW, there are no

requirements

If the nominal heat input of the ignition burner is greater than 0,25 kW or in the case of direct ignition of the main burner, the ignition safety time is chosen by the manufacturer such that the

ignition complies with the requirements of 5.25

This requirements is deemed to be met when the maximum ignition safety time determined

under the test conditions of 6.13.2.2.1 complies with the following requirements:

The ignition safety time shall not exceed

5.13.2.2.2 Extinction safety time

The extinction safety time of the ignition burner and the main burner shall not be greater

than 1 s

5.13.2.2.3 Purge

For automatic appliances a pre-purge period shall occur before each ignition of the main burner (a single attempt or several consecutive automatic ignition attempts) unless one of the

following conditions is met:

— the appliance is fitted with a permanent or alternating ignition burner;

— if the heat input is greater than 0,25 kW and the gas circuit is fitted with two valves which are at least class C or, class B and D closing simultaneously

Under the test conditions of 6.13.2.2.3 the duration shall be at least:

— for appliances where the pre-purge is induced over the whole cross-section of the

combustion chamber inlet at least 5 s at the air rate corresponding with the nominal heat input;

— for other appliances at least 15 s

5.13.3 Composition of the gas circuit

5.13.3.1 Manual appliances

5.13.3.1.1 Low pressure appliances

Appliances incorporating manual ignition shall be under the control of two shut-off valves in series which are at least class C and class D, or by a gas tap and flame supervision device

A thermoelectric flame supervision is considered to be a class C valve

5.13.3.1.2 Medium pressure appliances

Appliances incorporating manual ignition shall be under the control of two safety shut-off

valves in series one of which shall be of at least class B and one of which shall be of at least class C A heat sensitive flame supervision device is considered to be class C

5.13.4 Air proving devices

!When a forced air draught automatic burner is used, it shall be fitted with a device for

proving adequate air flow during ignition and operation of the air draft burner." Air flow failure at any time during ignition or operation of the burner shall cause safety shutdown The air proving device shall be proved in the no air position prior to start up or cause lockout

Proof of adequate air flow may be achieved as follows:

a) by differential pressure sensing where it can be shown that it provides satisfactory and reliable proof of air flow during the pre-purge, ignition and operation of the burner;

b) by flow sensing;

c) by any other means

Under the conditions of test defined in 6.13.4 the appropriate requirements of 5.13.4.1

and 5.13.4.2 shall be met, depending on the principle of air proving

5.13.4.1 Supervision of the combustion air pressure

Either:

— when the fan supply voltage is progressively reduced, the gas supply shall be shut off before the CO content exceeds 0,2 %; or

— for a voltage corresponding to a CO content greater than 0,1 % at equilibrium, restart

shall not be possible from cold

5.13.4.2 Supervision of the combustion air flow

5.14 Facility for remote control

Where the appliance is capable of being controlled by means of thermostats or a time control, electrical connections of these controls shall be possible without disturbing any internal

connections in the appliance other than a purpose designed link

5.15 Thermostats and control of air temperature

5.15.1 Control thermostats

Integral mechanical thermostats shall comply with EN 257

5.15.2 Air temperature control (room thermostat)

If an air temperature control is fitted it can be either an integral part of the appliance or it shall

be stated in the manufacturer's instructions how to install such a device

5.15.3 Overheat cut-off device

An overheat cut-off device shall be fitted to the appliance to cause shutdown and non-volatile lock-out in the event of an overheat condition occurring Failure of the overheat cut-off device shall cause safety shutdown and lock-out

The operating temperature of the overheat device shall be set and sealed by the manufacturer Where flame detection is achieved other than by means of a direct acting thermoelectric heat sensitive device, the non-volatile lock-out action shall not rely on the operation of the flame detection circuits In particular, the overheat cut-off device shall not be wired in series with the flame sensor or the line supply from a programming unit to any automatic shut-off valve and shall not operate during the normal cyclic action of the appliance, e.g as a consequence of room thermostat or clock control

The overheat device shall be so installed such that when tested in accordance with 6.16.3 the

gas supply to the burner shall be cut off so as to prevent:

a) the surface temperatures, as determined in 6.21, from exceeding those specified in 5.21,

by more than 30 K;

b) any damage to the appliance;

c) the air delivery temperature as determined in 6.24 increasing by more than 50 K;

d) a hazardous condition

5.16 Electrical equipment

The electrical equipment of the appliance shall comply with the relevant requirements of

EN 50165, except for the exclusions given below

If automatic control and safety devices form part of the electrical equipment, their safety shall comply with the relevant requirements of EN 60730-2-1 or EN 60730-2-9

If the appliance is fitted with electronic components or electronic systems providing a safety function, these shall comply with the relevant requirements of EN 60730-2-1 Part 2, with regard to electromagnetic compatibility immunity levels fixed by EN 298

The minimum degree of protection provided for electrical enclosures and electrical motors shall conform to IP 44 of IEC 34-5

5.17 Operational safety in the event of failure of auxiliary energy

Interruption and subsequent restoration of the electricity supply at any time during the starting

up or operation of the appliance shall result in:

a) for manual appliances, continued safe operation or safety shutdown;

b) for automatic appliances, volatile lock-out or safety shutdown

Interruption and subsequent restoration of the electricity supply shall not override any

“lock-out” condition

5.18 Motors and fans

The direction of rotation of motors and fans shall be clearly marked They shall be so mounted

as to minimize noise and vibration Lubrication points, if provided, shall be readily accessible Means shall be provided to prevent large objects from entering the fan, to minimize the risk of blockage and to prevent accidental injury to personnel This requirement shall be deemed to be met if entry of the standard test fingers specified in EN 60335-1 is prevented

5.19 Heat inputs

5.19.1 Verification of the nominal heat input

Under the conditions of test specified in 6.19.1 the heat input shall be within 5 % of the

nominal heat input stated by the manufacturer

5.19.2 Verification of the start gas heat input

Under the conditions of test specified in 6.19.2 the start gas shall be within 5 % of the start gas

heat input stated by the manufacturer

5.20 Overheating of the LPG cylinder and, where applicable, its compartment

When tested in accordance with 6.20, there shall be no overheating that will produce an

increase of vapour pressure greater than that defined in Table 2:

a) after 1 h with all burners alight at full rate;

b) during the 30 min following complete extinction of the appliance

Table 2 — Maximum allowable pressure increase inside the LPG cylinder

1,10 1,17 1,28

NOTE This increase in pressure corresponds to a temperature rise of 5 K starting from the appropriate ambient temperature

The temperature rise above ambient of the compartment walls shall not exceed 30 K at any point that is likely to come in contact with the flexible tube or hose

5.21 Temperature of various parts of the appliance

Under the conditions given in 6.21 the surface temperature of the various parts of the appliance

indicated below shall not exceed the specified limits

The temperature of those parts that are intended to be touched and surfaces within 25 mm of such parts shall not exceed the ambient by more than:

35 K for metals or equivalent materials;

45 K for porcelain or equivalent materials;

60 K for plastics or equivalent materials

The temperature of other surfaces of the appliance shall not exceed the ambient by more than

80 K Guards, and convected air outlet grills and surfaces within 20 mm of these are excluded from this requirement

The gas inlet shall be so positioned that its temperature does not exceed the ambient

temperature by more than 30 K

5.22 Floor temperatures

Under the conditions defined in 6.22, the appliance shall not cause the temperature of the floor

to exceed the ambient by more than 50 K

5.23 Temperature of taps and components

Under the conditions defined in 6.23, the temperature of tap bodies and components shall not

exceed the value recommended by the manufacturer for an ambient temperature of 20 8C

5.24 Air delivery temperatures

!Under the conditions of test defined in 6.24, the air delivery temperature of a space heating device shall not exceed the ambient temperature by more than 70 K The temperature of the ventilated air for a commercial drying appliance is not limited."

5.25 Ignition

5.25.1 General

Ignition of the ignition burner (or main burner if there is no ignition burner) shall be from an easily accessible position and shall be obtained by means of an ignition device incorporated in the appliance

Ignition burners and ignition devices shall be protected by design or position against

diminution or extinction of the flame resulting from, for example, draughts, products of

combustion, overheating, condensation or corrosion

Ignition burners and ignition devices and their mountings shall be so designed that they can only be located rigidly and correctly in relation to every component and burner with which they are designed to operate

When the ignition device incorporates a repetitive high voltage generator that provides more than 20 sparks at each output during a 3 s energization period, all the high voltage outputs shall

be regarded as electrically live and suitable protection against electric shock equivalent to that given in EN 60335-1 shall be provided

For automatic appliances, the ignition spark (or other means of ignition) shall not be energized before the completion of the purge period and shall be de-energized at or before the end of the burner ignition period The gas valve(s) shall not be energized before the ignition spark

(or other means of ignition) is energized

It shall be possible to determine readily that the ignition burner (or main burner if there is no ignition burner) is alight

Under the test conditions defined in 6.25, and in a still atmosphere, ignition shall be smooth,

flames shall carry across to all ports or jets, flames shall not light back or cause excessive noise and flames shall not leave the confines of the appliance

A slight tendency to flame lift is permitted at the moment of ignition, but the flame shall be stable under full working conditions

When tested in accordance with 6.25.2.3 any condensation on start up shall not affect the safe

operation of the appliance

5.25.2 Ignition performance

5.25.2.1 Ignition in the cold condition

When the appliance is operated in accordance with the manufacturer's instructions, and tested

in accordance with 6.25.2.1 ignition shall be in accordance with 5.25.1

5.25.2.2 Ignition in the hot condition

Ignition shall be in accordance with 5.25.1 when tested in accordance with the method

in 6.25.2.2 Ignition shall also take place at any thermostat setting down to the minimum rate

5.25.2.3 Ignition at low temperature

When the appliance is operated in accordance with the manufacturer's instructions, and tested

in accordance with 6.25.2.3, ignition shall be in accordance with 5.25.1

5.26 Crosslighting

Under the conditions defined in 6.26 and in a still atmosphere, crosslighting shall be ensured

correctly The flames shall be stable A slight tendency to flame lift is permitted at the moment

of ignition, but the flame shall be stable under full working conditions

5.26.1 Crosslighting in the cold condition

The crosslighting of an appliance having burners subdivided into sections (e.g duplex burners) and between ignition burner and main burners shall be smooth, flames shall carry across to all ports or jets and not light back when the appliance is tested in accordance with the method

given in 6.26.1

5.26.2 Crosslighting in the hot condition

The crosslighting of appliances having burners subdivided into sections (e.g duplex burners) and between ignition burners and main burners shall be smooth, flames shall carry across to all ports or jets and not light back when the appliance is tested in accordance with the method

given in 6.26.2

5.26.3 Crosslighting at low temperature

The crosslighting of appliances having burners subdivided into sections (e.g duplex burners) and between ignition burners and main burners shall be smooth, flames shall carry across to all ports or jets and not light back when the appliance is tested in accordance with the method

given in 6.26.3

5.26.4 Conditions of shortening of the flame of the ignition burner

On an appliance that incorporates a permanent ignition burner, that is, one where the control allows the selection of an “ignition burner only” position, ignition in the cold condition shall take place and shall not be violent when the rate of the ignition burner is reduced to two-thirds

of its normal rate

The arrangement of any flame supervision device shall be such that, in the event of ignition burner shortening, the valve in the device shall close the supply of gas to the main burner before ignition becomes violent, or the burner fails to ignite

5.27 Flame stability

5.27.1 Lift

After the burner has been alight for 1 min the flames shall not lift or be extinguished when

tested in accordance with the method given in 6.27.1

Burners that are sub-divided into sections under separate control (e.g duplex burners) shall also meet this requirement at all control settings

5.27.2 Light back

When tested in accordance with the methods given in 6.27.2, the appliance shall not light back

5.28 Flame length

Under the conditions of test in 6.28 there shall be no visible flame extending beyond the plane

of the appliance outlet

5.29 Combustion

When tested in accordance with the method given in 6.29 the CO content of the dry air free

combustion products shall not exceed 0,1 %

5.30 Operation safety

5.30.1 Operational safety in the event of normal fluctuations of auxiliary energy

When tested in accordance with the requirements of 6.30.1 the ignition shall be satisfactory

5.30.2 Operational safety in the event of abnormal fluctuations of auxiliary energy

When tested in accordance with the requirements of 6.30.2 the appliance shall either continue

to operate safely or cause safety shutdown

6 Test conditions and methods

This clause describes the methods of test which enable the requirements of Clause 5 to be

verified

6.1 General

6.1.1 Reference and limit gases

6.1.1.1 Definition of test gases

The test gases used shall be as required by EN 437

The burners are tested with the gases indicated in Table 3 according to the category of the

appliance (see 4.2 and 4.3)

Table 3 — Test gases corresponding to the categories of appliances

Category I3+, I3B/P(30), I3B/P(50), I3B/P I3P(30),I3P (37), I3P(50), I3P

Incomplete

The characteristics of the test gases are given in Table 4

The characteristics of the gases used for the tests shall be as near as possible to those given in Table 4 The constitution of these gases shall be in accordance with the following rules:

— the Wobbe number of the gas used shall be within 2% of the value indicated in Table 4 for the corresponding test gas;

— the gases used in the mixture shall have the following minimum percentage purity: