EN 50465:2008

SLOVENSKI STANDARD
01-januar-2009
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Gas appliances - Fuel cell gas heating appliance - Fuel cell gas heating appliance of
nominal heat input inferior or equal to 70 kW
Gasgeräte - Brennstoffzellen-Gasheizgerät - Brennstoffzellen-Gasheizgerät mit einer
Nennwärmebelastung kleiner oder gleich 70 kW
Appareils fonctionnant au gaz - Appareil à gaz produisant de la chaleur au moyen d'une
pile à combustible - Appareil de chauffage produisant de la chaleur au moyen d'une pile
à combustible dont le débit calorifique nominal est inférieur ou égal à 70 kW
Ta slovenski standard je istoveten z: EN 50465:2008
ICS:
27.070 Gorilne celice Fuel cells
97.100.20 Plinski grelniki Gas heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50465
NORME EUROPÉENNE
October 2008
EUROPÄISCHE NORM
ICS 27.070; 97.100.99
English version
Gas appliances -
Fuel cell gas heating appliances -
Fuel cell gas heating appliance of nominal heat input
inferior or equal to 70 kW
Appareils fonctionnant au gaz -  Gasgeräte -
Appareils à gaz produisant de la chaleur Brennstoffzellen-Gasheizgeräte -
au moyen d'une pile à combustible - Brennstoffzellen-Gasheizgerät
Appareil de chauffage produisant mit einer Nennwärmebelastung
de la chaleur au moyen d'une pile kleiner oder gleich 70 kW
à combustible dont le débit calorifique
nominal est inférieur ou égal à 70 kW

This European Standard was approved by CENELEC on 2008-05-01.

CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CENELEC Central Secretariat or to any CEN or 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 or CENELEC member into its own language and
notified to the CENELEC Central Secretariat has the same status as the official versions.

CEN and CENELEC members are the national standards bodies and national electrotechnical committees,
respectively, of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands,
Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

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© 2008 CEN/CENELEC - All rights of exploitation in any form and by any means reserved
worldwide for CEN national members and for CENELEC members.
Ref. No. EN 50465:2008 E
Foreword
This European Standard was prepared by the CEN/CLC/JWG FCGA, “Fuel cell gas appliances”.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50465 on
2008-05-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-05-01
This European Standard has been prepared under Mandate M/349 given to CEN and CENELEC by the
European Commission and the European Free Trade Association and covers essential requirements of
EC Directive 90/396/EEC (see Annex ZZ, which is an integral part of this document).
The essential requirement of EC Directive 90/396/EEC relating to "rational use of energy" is defined by the
maximum quantity of energy recovered (thermal and electrical energy output) from the gas energy input.
This European Standard deals with a very early state of new technology. The requirements of this European
Standard are not intended to constrain innovations. When considering materials, designs or constructions not
specifically dealt with in this European Standard the alternatives shall be evaluated as to their ability to yield
levels of safety and performance equivalent to those prescribed by this European Standard. This can be done
by a risk assessment. Furthermore not all requirements could be described in detail up to now. This is valid both
for the requirements and the test procedures. This will be done in later revisions of this European Standard.
Guidance to fuel cell stacks and their performance may be found in EN 62282-2.
Due to the development of new technology other solutions than those described in this standard are possible if
these solutions provide at least an equivalent level of safety.
Matters related to quality assurance systems, tests during production, and certificates of conformity of auxiliary
devices are not dealt with in this European Standard.
__________
– 3 – EN 50465:2008
Contents
1 Scope . 6
2 Normative references . 6
3 Definitions . 8
4 Classification . 23
4.1 Gases / Category. 23
4.2 Mode of air supply and evacuation of combustion products . 24
4.3 Maximum water side operating pressure . 25
5 Constructional requirements . 26
5.1 General construction (method of construction) . 26
5.2 Conversion to different gases . 29
5.3 Materials and thicknesses . 29
5.4 Gas circuit . 40
5.5 Cooling circuit / Water circuit . 42
5.6 Electrical equipment . 42
5.7 Requirements for adjusting, control and safety devices (if applicable) . 43
5.8 Pressure test points . 47
6 Operational requirements . 48
6.1 General requirem ents . 48
6.2 Soundness . 48
6.3 Heat inputs and heat output . 50
6.4 Safety of operation (Temperatures / Limit gas) . 50
6.5 Start / Release of adjusting, control and safety devices (if applicable) . 54
6.6 Overall efficiency at the nominal heat input . 58
6.7 Operation . 58
6.8 Combustion . 58
6.9 Resistance of the materials to pressure . 59
6.10 Hydraulic resistance . 60
7 Test methods . 60
7.1 General test conditions . 60
7.2 Soundness . 68
7.3 Heat input and heat output . 71
7.4 Safety of operation . 73
7.5 Start / Release (if applicable) . 87
7.6 Overall efficiency at the nominal heat input . 91
7.7 Operation . 92
7.8 Combustion . 92
7.9 Resistance of the materials to pressure . 96
7.10 Hydraulic resistance . 97
8 EMC / Electrical requirements . 98
9 Marking, installation and operating instructions . 99
9.1 Fuel cell gas heating appliance marking . 99
9.2 Fuel cell heating appliance installation instructions . 102
9.3 Fuel cell gas heating appliance operating instructions (users instruction) . 104
9.4 Conversion instructions . 105
9.5 Presentation . 105
Annex A (informative) National situations . 106
A.1 Categories marketed in the various countries . 106
A.2 FCGHA supply pressures . 108
A.3 Gas connections conditions in common use in the various countries . 109
Annex B (informative) Particular national conditions . 110
B.1 Gas groups distributed locally . 110
B.2 Special categories marketed nationally or locally . 110
B.3 Particular conditions . 110

Annex C (informative) Classification of type B and type C fuel cell gas heating appliances . 111
Annex D (informative) Composition of the gas circuit . 115
D.1 Minimum requirements for fuel cell gas heating appliance with fan, with ignition burner or
prepurge . 115
D.2 Minimum requirements for fuel cell gas heating appliances with fan, without permanent or
alternating ignition burner and without prepurge . 116
Annex E (informative) Practical method of calibrating the test rig to enable the heat loss D to be
p
determined . 117
Annex F (informative) A-deviations . 118
Annex G (informative) Main symbols and abbreviations used. 119
Annex H (informative) Examples for marking . 120
H.1 Data-plate (see 9.1.2) . 120
H.2 Additional data-plate (see 9.1.3) . 120
Annex I (informative) Calculation of conversions of NO . 121
x
Annex J (informative) Requirements and test methods for separate air supply and combustion
products evacuation ducts of type C appliances . 122
J.1 Requirements . 122
J.2 Test methods . 123
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives . 126
Bibliography . 129

Figures
Figure 1 – Typical set-up of a fuel cell gas heating appliance (all-in-one type) . 11
Figure 2 – Fuel cell gas heating appliance with external thermal conditioning system . 12
Figure 3 – Example for a sampling probe for the measurement of the products of combustion . 62
Figure 4 – Example for the location of the probe at a C type appliance . 63
Figure 5 – Test rig for the determination of the efficiency . 65
Figure 6 – Test rig for the soundness of the gas circuit . 67
Figure 7 – Test rig for the soundness of components (pressure drop method) . 68
Figure 8 – Test rig for thermostats: short cut circulation . 75
Figure 9 – Test rig for thermostats with heat exchanger . 76
Figure 10 – Test rig for type C appliances, equipped with horizontal wind protection device at a vertical wall . 80
Figure 11 – Test rig for type C appliances for installation in buildings with tilted roof . 81
Figure 12 – Test rig for type C appliances for installation in flat roofed buildings . 82
Figure 13 – Test rig for type C appliances for installation in buildings with tilted roof . 83
Figure 14 – Test rig for the determination of water losses . 98
Figure C.1 – Type B . 111
Figure C.2 – Type B . 111
Figure C.3 – Type C . 112
Figure C.4 – Type C . 112
Figure C.5 – Type C . 113
Figure C.6 – Type C . 113
Figure C.7 – Type C . 114
Figure C.8 – Type C . 114
Figure D.1 – Automatic gas shut off valves in the gas supply line for burners . 115
Figure D.2 – Automatic gas shut off valves in the gas supply line for permanent or alternating burners . 116
Figure J.1 – Maximum permitted recirculation of the combustion products . 122
Figure J.2 – Set up for pressure loss test in still air . 124
Figure J.3 – Set up for wind test . 125

– 5 – EN 50465:2008
Tables
Table 1 – Mechanical and chemical compositions of carbon and stainless steels . 32
Table 2 – Minimum requirements for cast iron . 33
Table 3 – Parts in aluminium and aluminium alloys . 33
Table 4 – Parts in copper or copper alloys . 33
Table 5 – Minimum thicknesses for rolled parts . 33
Table 6 – Nominal minimum thicknesses of fuel cell gas heating appliance sections . 33
Table 7 – Weld joints and welding processes . 34
Table 8 – Maximum admissible leakage rates . 49
Table 9 – NO classes . 59
x
Table 8 – (CO ) concentration of the combustion products, in percent . 93
2 N
Table 9 – Supplementary markings. 101

Table A.1 – Simple categories marketed . 106
Table A.1 – Double categories marketed . 107
Table A.2 – Normal supply pressures . 108
Table A.3 – Gas connections conditions in common use in the various countries . 109
Table B.1 – Locally distributed gas groups . 110
Table H.1 – Category(ies), direct and indirect country(ies) of destination . 120
Table H.2 – Example 1: Possibilities for the second gas family . 120
Table H.3 – Example 2: Possibilities for the third gas family . 120
Table I.1 – Conversion of the emission value of NO for second family gases . 121
x
Table I.2 – Conversion of the emission value of NO for third family gases . 121
x
Table ZZ.1 – Clauses of this European Standard addressing essential requirements or other provisions of
EC Directives . 126

1 Scope
This European Standard applies to the construction, the safety, the functional requirements and the test
methods, as well as the classification and the marking of a fuel cell gas heating appliance, which will be
operated predominantly heat followed, meeting the following boundary conditions:
– maximum heat load (gas input): 70 kW
– maximum electrical output: 11 kW.
NOTE  Due to the fact, that there are national deviations on the maximum electrical output in Europe, this maximum
electrical output is independent referring the number of connected phases to the public low voltage grid.
– fuel: combustion gas in accordance with EN 437
– maximum heating water temperature: 95 °C (under normal operational conditions)
– process pressures in the fuel cell gas appliance:
– heating water: max. 6 bar
– domestic hot water (if installed): max. 10 bar
– device construction: According to the expositions in accordance with CEN/TR 1749, EN 483 or EN 297
1)
(B , B , B , B , C , C , C , C , C , C , C , C , C , C , C , C ) .
22 23 32 33 12 13 32 33 42 43 52 53 62 63 82 83
This European Standard applies to type testing only.
This European Standard does not contain the requirements necessary for appliances for producing electrical
energy without thermal energy.
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 mbars
EN 125 Flame failure devices
EN 126 Multifunctional controls for gas burning appliances
EN 161 Automatic shut-off valves for gas burners and gas appliances
EN 297 Heating boilers operated with gaseous fuels – Type B + B boilers of nominal heat input
11 11BS
not exceeding 70 kW
EN 298 Automatic gas burner control systems for gas burners and gas burning appliances with or
without fans
1)
The classification used in this European Standard is based on upon the classification of CEN/TR 1749.

– 7 – EN 50465:2008
EN 437:1993 Test gases, test pressures and categories of appliance, for gas appliances
+ A1:1997
EN 483:1999 Gas-fired central heating boilers – Type C boilers of nominal heat input not exceeding 70 kW
+ A2:2001
EN 549 Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 677:1998 Gas fired central heating boilers Specific requirements for condensing boilers with a nominal
heat input not exceeding 70 kW
EN 1057 Copper and copper alloys – Seamless, round copper tubes for water and gas in sanitary and
heating applications
EN 1443 Chimneys – General requirements
CEN/TR 1749 European scheme for the classification of gas appliances according to the method of
evacuation of the products of combustion (types)
EN 1856-1 Chimneys – Requirements for metal chimneys – Part 1: System chimney products
EN 1856-2 Chimneys – Requirements for metal chimneys – Part 2: Metal liners and connecting flue
pipes
EN 1859 Chimneys – Metal chimneys – Test methods
EN 10029 Hot rolled steel plates 3 mm thick or above; tolerances on dimensions, shape and mass
EN 12067-1 Gas/air ratio controls for gas burners and gas burning appliances – Part 1: Pneumatic types
EN 12067-2 Gas/air ratio controls for gas burners and gas burning appliances – Part 2: Electronic types
EN 13611 Safety and control devices for gas burners and gas-burning appliances – General
requirements
EN 14459 Methods of risk analysis for the use of electronics in systems and control functions for gas
burners and gas burning appliances
EN 50438 Requirements for the connection of micro-generators in parallel with public low-voltage
distribution networks
EN 60335-1 Household and similar electric appliances – Safety – Part 1: General requirements
(IEC 60335-1, modified)
EN 60335-2-102 Household and similar electrical appliances – Safety – Part 2-102: Particular requirements
for gas, oil and solid-fuel burning appliances having electrical connections (IEC 60335-2-102,
modified)
EN 60529 Degrees of protection provided by enclosures (IEC 60529)
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, modified)
EN 61000-3-2 Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic current
emissions (equipment input current ≤ 16 A per phase) (IEC 61000-3-2)

EN 61000-3-3 Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes,
voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated
current ≤ 16 A per phase and not subject to conditional connection (IEC 61000-3-3)
EN 61000-6-1 Electromagnetic compatibility (EMC) – Part 6-1: Generic standards – Immunity for residential,
commercial and light-industrial environments (IEC 61000-6-1)
EN 61000-6-2 Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity for industrial
environments (IEC 61000-6-2)
EN 61000-6-3 Electromagnetic compatibility (EMC) – Part 6-3: Generic standards – Emission standard for
residential, commercial and light-industrial environments (IEC 61000-6-3)
EN 61000-6-4 Electromagnetic compatibility (EMC) – Part 6-4: Generic standards – Emission standard for
industrial environments (IEC 61000-6-4)
IEC/TS 62282-1 Fuel cell technologies – Part 1: Terminology
EN 62282-2:2004 Fuel cell technologies – Part 2: Fuel cell modules (IEC 62282-2:2004)
EN ISO 3166-1 Codes for the representation of names of countries and their subdivisions – Part 1: Country
codes (ISO 3166-1)
EN ISO 4063 Welding and allied processes – Nomenclature of processes and reference numbers
(ISO 4063)
CR 1404 Determination of emissions from appliances burning gaseous fuels during type-testing
ISO 7-1 Pipe threads where pressure-tight joints are made on the threads – Part 1: Designation,
dimensions and tolerances
ISO 228-1 Pipe threads where pressure-tight joints are not made on the threads – Part 1: Designation,
dimensions and tolerances
ISO 262 ISO general purpose metric screw threads – Selected sizes for screws, bolts and nuts
ISO 301 Zinc alloy ingots intended for casting
ISO 857 Welding, brazing and soldering processes – Vocabulary
ISO 2553 Welded brazed and soldered joints – Symbolic representation on drawings
ISO 7005-1 Metallic flanges – Part 1: Steel flanges
3 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
reference conditions
these correspond to 15 °C and 1 013,25 mbar, unless otherwise specified
[3.9 of EN 437:1993, modified]
NOTE 1 mbar = 10 Pa.
– 9 – EN 50465:2008
3.2
combustible gases
3.2.1
test gases
gases intended for the verification of the operational characteristics of appliances using combustible gases
[3.2 of EN 437:1993, modified]
In each gas family or group, test gases are defined
3.2.2
reference gas
test gas on which appliances operate under nominal conditions, when they are supplied at the corresponding
normal pressure condensed
[3.3 of EN 437:1993]
3.2.3
limit gases
test gas representative of the extreme variations in the characteristics of the gases for which appliances have
been designed
[3.4 of EN 437:1993]
3.2.4
calorific value
quantity of heat produced by the complete combustion, at a constant pressure of 1 013,25 mbar of unit volume
or mass of gas, the constituents of the combustible mixture being taken at reference conditions and the
combustion products being brought to the same conditions
A distinction is made between
– gross calorific value in which the water produced by combustion is assumed to be condensed

– symbol: H
s
– net calorific value in which the water produced by combustion is assumed to be in the vapour state
– symbol: H
i
– unit: either megajoule per cubic metre (MJ/m ) of dry gas brought to reference conditions,
or megajoule per kilogram (MJ/kg) of dry gas
[3.11 of EN 437:1993/A1:1997, modified]
3.2.5
relative density
ratio of the masses of equal volumes of dry gas and dry air under the same conditions of temperature and
pressure: 15 °C and 1 013,25 mbar
Symbol: d
[3.10 of EN 437:1993, modified]

3.2.6
Wobbe index
ratio of the calorific value of a gas per unit volume to 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
Symbol: gross Wobbe index: W
s
net Wobbe index: W
i
Unit: either megajoule per cubic meter (MJ/m³) of dry gas at the reference conditions,
or megajoule per kilogram (MJ/kg) of dry gas
[3.12 of EN 437:1993/A1:1997, modified]
3.2.7
gas pressure
3.2.7.1
general
all the pressures are static pressures of the moving gas, relative to the atmospheric pressure, measured at right
angles to the direction of flow of the gas
Symbol: p
Unit: millibar (mbar)
3.2.7.2
test pressures
gas pressures used to verify the operational characteristics of appliances using combustible gases. They
consist of normal and limit pressures
Unit: millibar (mbar)
[3.5 of EN 437:1993]
3.2.7.3
normal pressure
pressure under which the appliances operate in nominal conditions when they are supplied with the
corresponding reference gas
Symbol: p
n
[3.6 of EN 437:1993]
3.2.7.4
limit pressures
pressures representative of the extreme variations in the appliance supply conditions
Symbols:
– maximum pressure: p
max
– minimum pressure: p
min
[3.7 of EN 437:1993]
– 11 – EN 50465:2008
3.2.7.5
pressure couple
combination of two distinct gas distribution pressures applied by reason of the significant difference existing
between the Wobbe indices within a single gas family or group in which
– the higher pressure corresponds only to gases of low Wobbe index,
– the lower pressure corresponds to gases of high Wobbe index
[3.8 of EN 437:1993]
3.3
fuel cell gas heating appliance
appliance which produces simultaneous thermal energy and electrical energy (electrochemical reaction) from
only one primary energy source
The fuel cell gas heating appliance consists typically of distinct parts (see Figure 1):
1. the fuel processing system: chemical processing equipment including any associated heat exchangers
and controls required to convert input fuel to a composition suitable for the fuel cell stacks
[3.24 of IEC/TS 62282-1];
2. the fuel cell module: assembly including a fuel cell stack(s) which electrochemically converts chemical
energy to electric energy and thermal energy intended to be integrated into the fuel cell gas heating
appliance
[3.21 of IEC/TS 62282-1, modified];
3. the power conditioning system: equipment which is used to change the magnitude or waveform of the
voltage, or otherwise alter or regulate the output of a power source
[3.50 of IEC/TS 62282-1];
4. the internal thermal management and the thermal conditioning system: the internal thermal
management system provides cooling and heat rejection to maintain equilibrium within the fuel cell gas
heating system, assists in heating the power train during start up and supplies heat to the thermal
conditioning system.
This module can be divided in two parts if the thermal conditioning system is external (see Figure 2).

Exhaust gas
Water
Fuel Fuel cell Power conditioning
Electricity Electricity
processing module system
system
Inert gas
Thermal management
Air
and thermal
Heat
conditioning system
Fuel
Water
Figure 1 – Typical set-up of a fuel cell gas heating appliance (all-in-one type)

Exhaust gas
Water
Fuel Fuel Power conditioning
Electricity
Electricity
processing cell system
system module
Inert gas
Thermal
Air
management
Fuel
Thermal conditioning
Heat
system
(auxiliary heater)
Water
Figure 2 – Fuel cell gas heating appliance with external thermal conditioning system

3.4
constituent parts of the fuel cell gas heating appliance
3.4.1
supplied gas
gaseous fuel in vapour phase at 15 °C, 1 013,25 mbar, which supplies the fuel cell gas appliance to be
transformed in a process gas and to supply a burner if necessary.
It is represented by the tests gases described in EN 437 and is called “gas” in this standard
3.4.1.1
gas inlet connection
part of the fuel cell gas heating appliance intended to be connected to the gas supply
3.4.1.2
gas circuit
assembly of parts of the fuel cell gas heating appliance that carry or contain the combustible gas between the
fuel cell gas heating appliance gas inlet connection and the point at which air is admitted or the point at which
the supplied gas is reformed into process gas
3.4.1.3
process gas circuit
assembly of parts of the fuel cell gas heating appliance that carry or contain the process gas between the fuel
processing system, the fuel cell module and the after burning unit (if available)
3.4.1.4
restrictor
device, which is placed in the gas circuit so as to create a pressure drop and thus bring the gas pressure at the
burner to a predetermined value for a given supply pressure and a given rate

– 13 – EN 50465:2008
3.4.1.5
injector
component that admits gas into a burner
3.4.1.6
gas rate adjuster
component allowing the gas rate of a burner to be brought to a predetermined value according to the supply
conditions.
The action of operating this device is called “adjustment of the gas rate”
3.4.1.7
range-rating device
component on the fuel cell gas heating appliance intended to be used by the installer to adjust the nominal heat
input of the fuel cell gas heating appliance within the range of maximum and minimum heat inputs stated by the
manufacturer, to suit the actual heat requirements of the installation
3.4.1.8
primary aeration adjuster
device enabling the primary aeration of a burner to be set to the desired value according to the supply
conditions
3.4.1.9
sealing an adjuster or control device
arrangements made to make evident any attempt to change its adjustment (e.g. breakage of a device or a
sealing material).
A sealed adjuster or control device is considered to be non-existent
3.4.1.10
putting an adjuster or control device out of service
action intended to put an adjuster or control (rate, pressure, etc.) out of service
3.4.1.11
burners
3.4.1.11.1
main burner
burner that is intended to assure the thermal function of the fuel cell gas heating appliance and is generally
called “the burner”
3.4.1.11.2
premixed burner
burner in which the gas and a quantity of air at least equal to that theoretically necessary for complete
combustion are mixed before the flame ports
3.4.1.11.3
catalytic burner
burner (oxidizer) in which the gas and a quantity of air at least equal to that theoretically necessary for complete
combustion are mixed before the reaction zone, with a flameless combustion taking place in the reaction zone
which is supported by catalysts

3.4.1.11.4
ignition device
3.4.1.11.4.1
general
any means (flame, electrical ignition device or other device) used to ignite the gas admitted to the ignition burner
or the main burner
3.4.1.11.4.2
manual ignition device
device by means of which the ignition burner is ignited following manual intervention
3.4.1.11.4.3
automatic ignition device
automatic device which ignites the ignition burner or the main burner directly
3.4.1.11.5
ignition burner
burner intended to ignite a main burner. Those recognised are respectively
– permanent ignition burner: ignition burner that operates continuously throughout the whole period that the
fuel cell gas heating appliance is in use,
– intermittent ignition burner: ignition burner that is ignited before and extinguished at the same time as the
main burner,
– alternating ignition burner: ignition burner that is extinguished as soon as ignition of the main burner is
effected. It re-ignites at the main burner flame just before the latter goes out,
– interrupted ignition burner: ignition burner that operates only during the ignition sequence
3.4.2
process gas
gas, containing predominantly hydrogen, issued by the transformation of the supply gas
3.4.3
fuel cell
electro chemical devices that convert process gas and oxygen, usually from the air, into DC power, heat water
and other by-products
3.4.3.1
anode
fuel electrode, at which fuel oxidation takes place, by the removal of electrons from the fuel to the electric load,
followed by the release of oxidized fuel products
[3.4 of IEC/TS 62282-1]
3.4.3.2
cathode
air/oxidant electrode at which reduction takes place,by the donation of electrons from the electric load to the
oxidant, followed by the release of reduced oxidant products
[3.7 of IEC/TS 62282-1]
3.4.3.3
fuel cell stack
assembly of two or more fuel cells which are electrically connected
[3.23 of IEC/TS 62282-1]
– 15 – EN 50465:2008
3.4.3.4
PEM (Proton Exchange Membrane) fuel cell
fuel cell that employs proton exchange membrane as the electrolyte
[3.51 of IEC/TS 62282-1]
3.4.3.5
SO (Solid Oxide) fuel cell
fuel cell that employs an oxide ion-conducting electrolyte
[3.58 of IEC/TS 62282-1]
3.4.4
air supply and combustion products evacuation
3.4.4.1
combustion circuit
circuit including the air supply duct, the combustion chamber, the heat exchanger, the combustion products
evacuation duct and either the fitting piece or the connection to the terminal, if any
3.4.4.2
combustion products circuit
circuit including the combustion chamber, the combustion products evacuation duct and either the fitting piece
or the connection to the terminal, if any
3.4.4.3
combustion chamber
enclosure inside which combustion of the air-gas mixture takes place
3.4.4.4
air supply and combustion products evacuation ducts
means for air transporting combustion air to the burner and combustion products to the terminal or fitting piece.
It is necessary to distinguish between
– completely surrounded ducts: the combustion products evacuation duct is surrounded by combustion air
throughout its length,
– separate ducts: the combustion products evacuation duct and the combustion air supply duct are neither
concentric nor completely surrounded ducts
3.4.4.5
terminal
device fitted to the outside of the building, to which are connected
– the air supply and combustion products evacuation ducts for type C and C fuel cell gas heating appliance
1 3
(one or two devices),
– the air supply duct on the one hand and the combustion products evacuation duct on the other hand for type
C fuel cell gas heating appliance (two devices),
– the air supply duct for type C fuel cell gas heating appliance (one device)
NOTE Sometimes, the expression 'terminal' is also used for electric connectors.
3.4.4.6
terminal guard
device that protects the terminal from mechanical damage from outside influences

3.4.4.7
fitting piece
device which allows the fitting of
– the air supply and combustion products evacuation ducts to two ducts of a shared duct system for type C
fuel cell gas heating appliance,
– type C fuel cell gas heating appliance to a system for air supply and combustion products evacuation that is
approved and marketed independently from the fuel cell gas heating appliance,
– the combustion products evacuation duct to a chimney that is part of the building for type C fuel cell gas
heating appliance.
The fitting piece may be part of the fuel cell gas heating appliance or of the air supply and/or combustion
products evacuation system
3.4.5
monitoring and safety devices
3.4.5.1
pressure governor
device which maintains the downstream pressure constant to within fixed limits independent of variations, within
a given range, of the upstream pressure and the gas rate
3.4.5.2
...