EN 15502-2-3:2023
(Main)Gas-fired central heating boilers - Part 2-3: Specific standard for hybrid units combining a gas-fired boiler and an electrical heat pump in a product
Gas-fired central heating boilers - Part 2-3: Specific standard for hybrid units combining a gas-fired boiler and an electrical heat pump in a product
This document specifies the requirements and tests methods concerning the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of hybrid units.
A hybrid unit is composed of:
- a gas boiler as a heat generator which is able to supply the heat demand in all operating conditions;
- an electrical air-to-water heat pump, as a heat generator, which does not have to meet the heat demand in all operating conditions;
- a control unit (see definition 3.1.10).
A hybrid unit can include the facility to produce hot water, either by the instantaneous or storage principle, the whole being marketed as a single unit.
A gas boiler as part of a hybrid unit covered by this document is a gas-fired central heating boiler from the types C1 up to C9 and the types B2, B3 and B5, according to the classification in EN 1749:2020:
a) that have a nominal heat input (on the basis of gross calorific value) not exceeding 400 kW;
b) that use one or more combustible gases of the three gas families at the pressures stated in EN 437:2021;
c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the water circuit does not exceed 6 bar;
e) which are classified as a gas-fired central heating boiler;
f) which are intended to be installed either indoors or outdoors in a partially protected place;
g) which are designed for either sealed water systems or for open water systems.
This document provides requirements for boilers with known constructions.
NOTE 1 For boilers with any alternative constructions, which might not fully be covered by this document, the risk associated with this alternative construction needs to be assessed.
NOTE 2 An example of an assessment methodology, based upon risk assessment and which covers the essential requirements of the Gas Appliance Regulation UE/426/2016, is given in Clause 11.
This document does not cover all the requirements for:
aa) appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see EN 15502-1:2021, Annex AB);
ab) appliances using flue dampers;
ac) appliances of the types B21, B31, B51, C21, C41, C51, C61, C71 and C81;
ad) appliances incorporating flexible plastic flue liners;
ae) appliances designed to become connected to a combined flue duct system.
af) appliances of the types C(10),C(11), C(12) and C(13);
ag) C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
ah) appliances intended to be connected to a flue having mechanical extraction;
ai) surface temperatures of external parts particular to children and elderly people;
aj) appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas;
ak) appliances equipped with an adaptive combustion control function (ACCF);
al) boilers intended to be installed in areas accessible to elderly people and children.
This document specifies minimum operating requirements which ensure that the products are fit for the use designated by the technical instructions when used for space heating and/or DHW production.
This document is intended to be used in conjunction with:
ba) the gas-fired boiler, the generic part EN 15502-1:2021 and specific parts FprEN 15502-2-1:2022 and FprEN 15502-2-2:2022;
bb) the electrical heat pump, EN 14511-4:2018, EN 378-1:2016+A1:2020, EN 378-2:2016 and EN 14825:2022;
bc) electrical safety, EN 60335-1:2012 , EN 60335-2-102:2016 and IEC 60335-2-40:2018;
bd) for domestic hot water production, EN 13203-5:2022.
Heizkessel für gasförmige Brennstoffe - Teil 2-3: Spezifische Norm für Hybrid-Raumheizgeräte, die gasbefeuerte Geräte mit Wärmepumpen in einem Produkt kombinieren
Dieses Dokument legt die Anforderungen und Prüfverfahren für Hybridgeräte bezüglich des Aufbaus, der Sicherheit, der Gebrauchstauglichkeit und der rationellen Energienutzung, sowie hinsichtlich ihrer Klassifizierung und Kennzeichnung fest.
Ein Hybridgerät besteht aus:
- einem Gasheizkessel als Wärmeerzeuger, der dazu in der Lage ist, den Wärmebedarf unter allen Betriebsbedingungen zu decken;
- einer elektrischen Luft-Wasser-Wärmepumpe als Wärmeerzeuger, die den Wärmebedarf nicht unter allen Betriebsbedingungen zu erfüllen braucht;
- einem Steuergerät (siehe Begriff in 3.1.10).
Ein Hybridgerät kann die Möglichkeit der Warmwasserbereitung einschließen, entweder nach dem Durchlaufprinzip oder nach dem Speicherprinzip, wobei das Ganze als eine Einheit vertrieben wird.
Bei einem Gasheizkessel als Teil des in diesem Dokument behandelten Hybridgeräts handelt es sich um gasbefeuerte Zentralheizungskessel der Bauart C1 bis C9 sowie B2, B3 und B5 nach der Klassifizierung in EN 1749:2020:
a) die eine Nennwärmebelastung (auf Basis des Brennwerts) von nicht mehr als 400 kW haben;
b) die mit einem oder mehreren brennbaren Gasen der drei Gasfamilien mit den in EN 437:2021 genannten Drücken betrieben werden;
c) bei denen die Temperatur des Wärmeträgermediums unter normalen Betriebsbedingungen 105 °C nicht überschreitet;
d) deren wasserseitiger Betriebsdruck höchstens 6 bar beträgt;
e) die als gasbefeuerte Zentralheizungskessel klassifiziert werden;
f) die dafür vorgesehen sind, entweder im Gebäude oder an einer teilweise geschützten Stelle im Freien aufgestellt zu werden;
g) die für entweder geschlossene oder für offene Wassersysteme ausgelegt sind.
Dieses Dokument legt Anforderungen an Kessel mit bekannter Bauweise fest.
ANMERKUNG 1 Für Kessel mit alternativer Bauweise, die nicht vollständig durch dieses Dokument abgedeckt sein könnten, muss das Risiko, das mit dieser alternativen Bauweise verbunden ist, bewertet werden.
ANMERKUNG 2 Ein Beispiel für eine auf einer Risikobewertung beruhende Bewertungsmethodik, die die wesentlichen Anforderungen der Gasgeräteverordnung (EU) 2016/426 abdeckt, ist in Abschnitt 11 angegeben.
Dieses Dokument deckt nicht alle Anforderungen ab für:
aa) Geräte, die für den Anschluss an Gasversorgungsnetze vorgesehen sind, bei denen die Qualität des verteilten Gases wahrscheinlich über die Lebensdauer des Geräts stark schwankt (siehe EN 15502 1:2021, Anhang AB);
ab) Geräte, die Abgasklappen nutzen;
ac) Geräte der Bauarten B21, B31, B51, C21, C41, C51, C61, C71 und C81;
ad) Geräte, die flexible Kunststoffabzüge beinhalten;
ae) Geräte, die für den Anschluss an ein kombiniertes Abgasabführungssystem ausgelegt sind;
af) Geräte der Bauarten C(10), C(11), C(12) und C(13);
ag) Geräte der Bauart C7, die eine Nennwärmebelastung (auf Basis des Brennwerts) von mehr als 70 kW haben;
ah) Geräte, die für den Anschluss an eine mechanische Abführung der Abgase vorgesehen sind;
ai) Oberflächentemperaturen von Außenteilen, insbesondere für Kinder und ältere Menschen;
aj) Geräte, die für die Verbrennung von Erdgas der zweiten Familie bestimmt sind, wenn dem Erdgas Wasserstoff zugesetzt wird;
ak) Geräte, die mit einer adaptiven Verbrennungsregelungsfunktion (ACCF, en: adaptive combustion control function) ausgestattet sind;
al) Kessel, die für die Aufstellung in Bereichen vorgesehen sind, die für ältere Menschen und Kinder zugänglich sind.
Dieses Dokument legt Mindestbetriebsanforderungen fest, die sicherstellen, dass die Produkte bei Nutzung zur Raumheizung und/oder Brauchwarmwasserbereitung entsprechend der in den technischen Anleitungen ausgewiesenen Verwendung gebrauchstauglich sind.
Chaudières de chauffage central utilisant les combustibles gazeux - Partie 2-3 : Norme spécifique pour les appareils de chauffage hybrides combinant appareil à combustible gazeux et pompe à chaleur dans un même produit
Le présent document spécifie les exigences et les méthodes d’essai applicables aux appareils hybrides et concernant en particulier leur conception, leur sécurité, leur aptitude à la fonction, leur utilisation rationnelle de l’énergie ainsi que leur classification et leur marquage.
L’appareil hybride est composé :
— d’une chaudière à gaz comme générateur de chaleur, qui peut répondre à la demande de chaleur dans toutes les conditions de fonctionnement ;
— d’une pompe à chaleur électrique comme générateur de chaleur, qui n’a pas à répondre à la demande de chaleur dans toutes les conditions de fonctionnement ;
— d’un dispositif de commande (voir la définition en 3.1.10).
L’appareil hybride peut comporter la possibilité de produire de l’eau chaude, soit par le principe instantané, soit par stockage, l’ensemble étant commercialisé comme une seule unité.
Une chaudière à gaz dans un appareil hybride couvert par le présent document appartient aux chaudières de chauffage central à combustibles gazeux des types C1 à C9 et B2, B3 et B5, conformément à la classification de l’EN 1749:2020 :
a) dont le débit calorifique nominal (basé sur le pouvoir calorifique supérieur) est inférieur ou égal à 400 kW ;
b) utilisant un ou plusieurs combustibles gazeux appartenant aux trois familles de gaz et aux pressions indiquées dans l’EN 437:2021 ;
c) dont la température du fluide caloporteur ne dépasse pas 105 °C en fonctionnement normal ;
d) dont la pression maximale de service dans le circuit d’eau ne dépasse pas 6 bar ;
e) devant être classées comme chaudière à gaz ;
f) destinées à être installées en intérieur ou en extérieur à un emplacement partiellement protégé ;
g) conçues pour des circuits d’eau fermés ou ouverts.
Le présent document fournit des exigences pour les chaudières dont la construction est connue.
NOTE 1 Pour les chaudières de construction différente susceptibles de ne pas être couvertes par le présent document, le risque associé à cette construction différente nécessite d’être évalué.
NOTE 2 L’Article 11 donne un exemple de méthodologie d’évaluation basée sur l’évaluation des risques et couvrant les exigences essentielles du Règlement UE/426/2016 concernant les appareils brûlant des combustibles gazeux.
[…]
Plinski kotli za centralno ogrevanje - 2-3. del: Poseben standard za hibridne naprave, pri katerih je v enem izdelku plinski kotel kombiniran z električno toplotno črpalko
Ta dokument določa zahteve in preskusne metode zlasti v zvezi s konstrukcijo, varnostjo, ustreznostjo za predviden namen in smiselno porabo energije ter z razvrstitvijo in označevanjem hibridnih izdelkov.
Hibridni izdelek je sestavljen iz:
– plinskega kotla, ki deluje kot generator toplote in lahko zadosti potrebam po toploti v vseh obratovalnih pogojih;
– električne toplotne črpalke, ki deluje kot generator toplote, vendar v tem primeru ni treba zadostiti potrebam po toploti v vseh obratovalnih pogojih;
– krmilne enote (glej definicijo v točki 3.10).
Plinski kotel kot del hibridnega izdelka, zajet v tem dokumentu, je plinski kotel za centralno ogrevanje tipov od C1 do C9 ter tipov B2, B3 in B5 v skladu z razvrstitvijo v standardu EN 1749:2020, kar vključuje naprave:
a) z nazivno grelno močjo, ki ne presega 400 kW (glede na bruto kalorično vrednost);
b) ki uporabljajo enega ali več gorljivih plinov iz treh družin plinov pri tlakih, navedenih v standardu EN 437;
c) pri katerih temperatura tekočine za prenos toplote pri običajnem obratovanju ne presega 105 °C;
d) pri katerih najvišji obratovalni tlak v vodnem omrežju ne presega 6 barov;
e) ki morajo biti razvrščene kot plinski kotel;
f) ki so predvidene za notranjo ali zunanjo namestitev v delno zaščitenem prostoru;
g) ki lahko vključujejo tudi funkcijo ogrevanja vode po načelu pretočnosti ali načelu shranjevanja, pri čemer se naprava trži kot ena enota;
h) ki so izdelane za zaprte vodne sisteme ali odprte vodne sisteme.
Ta dokument določa zahteve za kotle z znanimi konstrukcijami. V zvezi s kotli z drugačnimi konstrukcijami, ki morda niso v celoti zajeti v tem dokumentu, je treba oceniti tveganje, povezano z drugačno konstrukcijo.
Primer metodologije ocenjevanja, ki temelji na oceni tveganja in zajema osnovne zahteve direktive o plinskih napravah UE/426/2016, je podan v točki 11.
Ta dokument ne obravnava vseh zahtev za:
naprave za povezavo s plinskimi omrežji, v katerih bo kakovost distribuiranega plina med življenjsko dobo naprave verjetno znatno nihala (glej dodatek DD);
a) naprave, ki uporabljajo dimniške lopute;
b) naprave tipov B21, B31, B51, C21, C41, C51, C61, C71 in C81;
c) naprave z gibljivimi plastičnimi izpušnimi tuljavami;
d) naprave, namenjene povezavi s sistemom kombiniranih izpušnih vodov za delovanje pod nadtlakom (na primer Ca).
Ta dokument določa minimalne operativne zahteve, ki zagotavljajo, da so izdelki primerni za uporabo, ki jo določi proizvajalec, kadar se uporabljajo za ogrevanje prostora in/ali proizvodnjo gospodinjske tople vode (DHW).
Ta del določa splošne zahteve in preskusne metode zlasti v zvezi s konstrukcijo, varnostjo, ustreznostjo za predviden namen in smiselno porabo energije.
Ta dokument je treba uporabljati v povezavi z naslednjimi standardi:
a) splošni del standarda EN 15502-1 ter posebna dela 2-1 in 2-2 (plinski kotli);
b) EN 14511-4:2018, od EN 378-1:2016 do EN 378-4:2016+A1:2019 in FprEN 14825:2020 (električna toplotna črpalka);
c) EN 60335-1:2019, EN 60335-2-102:2016, EN 60335-2-40:2012, EN 60335-2-40/A2:2009 in EN 60204-1 (električna varnost);
d) EN 13203-5 (proizvodnja gospodinjske tople vode).
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2024
Plinski kotli za centralno ogrevanje - 2-3. del: Poseben standard za hibridne
naprave, pri katerih je v enem izdelku plinski kotel kombiniran z električno
toplotno črpalko
Gas-fired central heating boilers - Part 2-3: Specific standard for hybrid units combining a
gas fired boiler and an electrical heat pump in a product
Heizkessel für gasförmige Brennstoffe - Teil 2-3: Spezifische Norm für Hybrid
Raumheizgeräte, die gasbefeuerte Geräte mit Wärmepumpen in einem Produkt
kombinieren
Chaudières de chauffage central utilisant les combustibles gazeux - Partie 2-3 : Norme
spécifique pour les appareils de chauffage hybrides combinant appareil à combustible
gazeux et pompe à chaleur dans un même produit
Ta slovenski standard je istoveten z: EN 15502-2-3:2023
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.20 Plinski grelniki Gas heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 15502-2-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2023
EUROPÄISCHE NORM
ICS 27.060.30; 91.140.10
English Version
Gas-fired central heating boilers - Part 2-3: Specific
standard for hybrid units combining a gas-fired boiler and
an electrical heat pump in a product
Chaudières de chauffage central utilisant les Heizkessel für gasförmige Brennstoffe - Teil 2-3:
combustibles gazeux - Partie 2-3 : Norme spécifique Spezifische Norm für Hybrid-Raumheizgeräte, die
pour les appareils de chauffage hybrides combinant gasbefeuerte Geräte mit Wärmepumpen in einem
appareil à combustible gazeux et pompe à chaleur dans Produkt kombinieren
un même produit
This European Standard was approved by CEN on 26 June 2023.
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 CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15502-2-3:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and symbols . 9
3.1 Terms and definitions . 9
3.2 Symbols. 10
4 Classification . 10
5 Construction . 10
5.1 General . 10
5.2 Conversion to different gases . 10
5.3 Materials . 10
5.4 Method of construction . 11
5.4.1 Design . 11
5.4.2 Checking the state of operation . 11
5.4.3 Use and service . 11
5.4.4 Connections to the gas and water pipes . 11
5.4.5 Soundness . 11
5.4.6 Supply of combustion air and evacuation of the combustion products . 11
5.4.7 Dampers . 11
5.4.8 Air proving . 12
5.4.9 Gas/air ration controls . 12
5.4.10 Fan . 12
5.4.11 Drainage . 12
5.4.12 Operational safety in the event of failure of the auxiliary energy . 12
5.4.13 Special provision for Low Temperature Boilers and Condensing Boilers . 12
5.5 Burners . 12
5.6 Pressure test points . 12
5.7 Requirements for the application of control and safety devices . 12
5.8 Additional requirements for modular boilers . 12
6 Electrical safety . 12
7 Controls . 12
8 Operational requirements . 13
8.1 General . 13
8.2 Soundness . 13
8.3 Hydraulic resistance . 14
8.4 Heat inputs and heat outputs . 14
8.5 Limiting temperatures . 14
8.6 Ignition, cross lighting, flame stability . 14
8.7 Reduction of the gas pressure . 14
8.8 Defective closure of the gas valve immediately upstream of the main burner . 14
8.9 Pre-purge . 15
8.10 Functioning of a permanent ignition burner when a fan stops during the standby time
............................................................................................................................................................................. 15
8.11 Adjustment, control and safety devices . 15
8.12 Carbon monoxide. 15
8.13 NOx . 15
8.14 Special provisions for boilers intended to be installed in a partially protected place. 16
8.15 Formation of combustion products . 16
8.16 Temperature of combustion products . 16
8.17 Sound power level . 16
9 Useful efficiencies . 17
10 Electric auxiliary energy . 19
11 Risk assessment . 19
12 Marking and instructions . 19
12.1 Boiler marking . 19
12.2 Instructions . 19
12.3 Presentation . 20
Annex XA (normative) Test apparatus for type C boilers . 22
Annex XB (normative) Test methods to determine the effects of long-term thermal load,
long-term condensate exposure, condensing/non condensing cycling resistance to UV
radiation . 23
Annex XC (informative) This annex is empty on purpose . 24
Annex XD (informative) Example on calculation of common duct system for type C
(11)
boilers . 25
Annex ZB (informative) Clauses of this European Standard addressing the methods for the
verification of the efficiency of the EU Directive 92/42/EEC, relating to the efficiency
of new hot boilers with an output of (4 – 400) kW . 26
Annex ZC (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 813/2013 L 239/136 aimed to be
covered . 27
Annex ZD (informative) Relationship between this European Standard and the energy
labelling requirements of Commission Delegated Regulation (EU) No 811/2013 L
239/1 aimed to be covered . 28
Annex ZE (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426 of the European Parliament and of the
Council of 9 March 2016 on appliances burning gaseous fuels and repealing Directive
2009/142/EC aimed to be covered . 30
Bibliography . 42
European foreword
This document (EN 15502-2-3:2023) has been prepared by Technical Committee CEN/TC 109 “Central
heating boilers using gaseous fuels”, the secretariat of which is held by NEN.
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 March 2024, and conflicting national standards shall be
withdrawn at the latest by March 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
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 Annexes ZB, ZC, ZD and ZE, which are an integral
part of this document.
Relation between this document and EN 15502-2-1:2022 and EN 15502-1:2021:
a) This document is intended to be used in conjunction with EN 15502-2-1:2022, while
EN 15502-2-1:2022 is intended to be used in conjunction with EN 15502-1:2021. This means that
this document is intended to be used in conjunction with both EN 15502-2-1:2022 and
EN 15502-1:2021 and that all information in EN 15502-2-1:2022 and EN 15502-1:2021 applies
as well, unless stated otherwise (see under b) and c)).
b) This document follows the numbering structure of EN 15502-2-1:2022 and expands on it, while
EN 15502-2-1:2022 follows the numbering structure of EN 15502-1:2021 and expands on it.
c) Where this document states: “Shall be according to EN 15502-2-1:2022, [clause number]”, the
numbering, title and text of that clause of EN 15502-2-1:2022 is intended to be used. This is
including its subclauses and subclause numbering, tables and table numbering, equations and
equation numbering, figures and figure numbering, lists and list numbering.
NOTE This document and its annexes can refer to (sub)clause numbers that are to be found either in
this document, in EN 15502-2-1:2022 or in EN 15502-1:2021.
d) This document refers to clauses of EN 15502-2-1:2022 or adapts its clauses by stating in the
corresponding clause:
— “shall be according to EN 15502-2-1:2022, [clause number] with the following modification”;
— “shall be according to EN 15502-2-1:2022, [clause number] with the following modification
of [sub clause number(s)]”;
— “shall be according to EN 15502-2-1:2022, [clause number] with the following addition”;
— “shall be according to EN 15502-2-1:2022, [clause number] with the addition of [subclause
number(s)] at the end”;
— “EN 15502-2-1:2022, [clause number] is replaced by the following”;
— “the title of EN 15502-2-1:2022 [clause number] is replaced by the following”;
— “EN 15502-2-1:2022, [clause number] is not applicable”.
e) Clauses or subclauses in this document that are additional to the structure of EN 15502-2-1:2022
are numbered “20x” (e.g. 3.1.201, 8.4.201, Table 201, Formula 201, Figure 201) or designated as
Annex “Y” (e.g Annex YA, YB, YC, etc.). These additional (sub)clauses provide requirements and
information that is specific for the appliances that are covered in the scope of this document.
NOTE The additional (sub)clauses in this docuement are not indicated as an addition to
EN 15502-2-1:2022.
The following standards can be applicable to the product(s) identified in the scope:
a) the electrical heat pump, EN 14511-4:2018, EN 378-1:2016+A1:2020, EN 378-2:2016 and
EN 14825:2022;
1 2
b) electrical safety, EN 60335-1:2012 , EN 60335-2-102:2016 and EN IEC 60335-2-40:2023 ;
c) for domestic hot water production, EN 13203-5:2022.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
As impacted by EN 60335-1:2012/AC:2014, EN 60335-1:2012/A11:2014, EN 60335-1:2012/A1:2019,
EN 60335-1:2012/A2:2019, EN 60335-1:2012/A13:2017, EN 60335-1:2012/A14:2019 and
EN 60335-1:2012/A15:2021.
As impacted by EN IEC 60335 2 40:2023/A11:2023.
Introduction
Hybrid heat pump using gas as fossil energy (called “hybrid unit” in this document) is intended to
combine renewable source heat generators and gas-fired heat generators. Most of these renewable
sources have a climate dependent efficiency and capacity, such as air-to-water heat pumps relying on the
inlet air conditions. Therefore, the seasonal efficiency of hybrid units cannot be assessed in the same way
as the seasonal efficiency of gas-fired heaters, where the climate effect on efficiency is not noticeable.
A hybrid unit using gas as fossil energy cannot be considered as a heat pump nor fully as a gas-fired
appliance.
The standard rating conditions and methods are given in the EN 15502-1:2021 and EN 15502-2-1:2022
for gas-fired appliances and EN 14511-2:2018 and EN 14511-3:2018 for heat pumps.
This document deals with safety aspects especially coming from coexistence of gas and refrigerant fluid.
This document provides a method to define the seasonal efficiency of hybrid units. The method is based
on a set of part load conditions in different climatic conditions weighted to represent the space heating
demand over a year.
1 Scope
This document specifies the requirements and tests methods concerning the construction, safety, fitness
for purpose, and rational use of energy, as well as the classification and marking of hybrid units.
A hybrid unit is composed of:
— a gas boiler as a heat generator which is able to supply the heat demand in all operating conditions;
— an electrical air-to-water heat pump, as a heat generator, which does not have to meet the heat
demand in all operating conditions;
— a control unit (see definition in 3.1.10).
A hybrid unit can include the facility to produce hot water, either by the instantaneous or storage
principle, the whole being marketed as a single unit.
A gas boiler as part of a hybrid unit covered by this document is a gas-fired central heating boiler from
the types C up to C and the types B , B and B , according to the classification in EN 1749:2020:
1 9 2 3 5
a) that have a nominal heat input (on the basis of gross calorific value) not exceeding 400 kW;
b) that use one or more combustible gases of the three gas families at the pressures stated in
EN 437:2021;
c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the water circuit does not exceed 6 bar;
e) which are classified as a gas-fired central heating boiler;
f) which are intended to be installed either indoors or outdoors in a partially protected place;
g) which are designed for either sealed water systems or for open water systems.
This document provides requirements for boilers with known constructions.
NOTE 1 For boilers with any alternative constructions, which might not fully be covered by this document, the
risk associated with this alternative construction needs to be assessed.
NOTE 2 An example of an assessment methodology, based upon risk assessment and which covers the essential
requirements of the Gas Appliance Regulation UE/426/2016, is given in Clause 11.
This document does not cover all the requirements for:
aa) appliances that are intended to be connected to gas grids where the quality of the distributed gas is
likely to vary to a large extent over the lifetime of the appliance (see EN 15502-1:2021, Annex AB);
ab) appliances using flue dampers;
ac) appliances of the types B , B , B , C , C , C , C , C and C ;
21 31 51 21 41 51 61 71 81
ad) appliances incorporating flexible plastic flue liners;
ae) appliances designed to become connected to a combined flue duct system.
af) appliances of the types C ,C , C and C ;
(10) (11) (12) (13)
ag) C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
ah) appliances intended to be connected to a flue having mechanical extraction;
ai) surface temperatures of external parts particular to children and elderly people;
aj) appliances that are intended to burn natural gases of the second family where hydrogen is added to
the natural gas;
ak) appliances equipped with an adaptive combustion control function (ACCF);
al) boilers intended to be installed in areas accessible to elderly people and children.
This document specifies minimum operating requirements which ensure that the products are fit for the
use designated by the technical instructions when used for space heating and/or DHW production.
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 378-1:2016+A1:2020, Refrigerating systems and heat pumps - Safety and environmental requirements
- Part 1: Basic requirements, definitions, classification and selection criteria
EN 378-2:2016, Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2:
Design, construction, testing, marking and documentation
EN 14511-1:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling
and process chillers, with electrically driven compressors — Part 1: Terms and definitions
EN 14511-3:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling
and process chillers, with electrically driven compressors — Part 3: Test methods
EN 14511-4:2018, Air conditioners, liquid chilling packages and heat pumps for space heating and cooling
and process chillers, with electrically driven compressors — Part 4: Requirements
EN 14825:2022, Air conditioners, liquid chilling packages and heat pumps, with electrically driven
compressors, for space heating and cooling, commercial and process cooling - Testing and rating at part
load conditions and calculation of seasonal performance
EN 15502-1:2021, Gas-fired heating boilers - Part 1: General requirements and tests
EN 15502-2-1:2022, Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and
type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW
, Gas-fired central heating boilers — Part 2-2: Specific standard for type B1 appliances
EN 15502-2-2:—
EN IEC 60335-2-40:2023 , Household and similar electrical appliances - Safety - Part 2-40: Particular
requirements for electrical heat pumps, air-conditioners and dehumidifiers
To be published. Stage at the time of publication: prEN 15502-2-2:2023.
ISO 817:2014 , Refrigerants — Designation and safety classification
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 15502-1:2021,
EN 15502-2-1:2022, EN 15502-2-2:— , EN 14511-1:2018, EN 378-1:2016+A1:2020 to
EN 378-4:2016+A1:2019, EN 14825:2022 and the following apply.
3.1.1
hybrid unit
encased assembly or assemblies designed as a complete unit consisting of the combination of an
electrically driven air-to-water heat pump and a gas-fired heat generator, managed by a common
controller providing an optimized operation of the unit for space heating
Note 1 to entry: The hybrid units may also provide domestic hot water and/or space cooling.
3.1.2
product
product placed on the market as a one reference. It could be one or several packages of one or several
casings
3.1.3
design load
P
designh
space heating load (P ) provided by the technical instructions at T conditions respectively
designh designh
Note 1 to entry: It is possible to calculate the SCOP/SCOP /SCOP of a unit for more than one P value.
on net design
Note 2 to entry: Expressed in kW.
3.1.4
reference design conditions for space heating
T
designh
temperature conditions for average, colder and warmer climates
[SOURCE: EN 14825:2022, 3.1.74]
3.1.5
very high temperature application
application where the hybrid unit delivers its declared heating capacity at water outlet temperature of
80 °C, at standard conditions given by 8.4.4 of EN 15502-2-1:2022
3.1.6
flammable refrigerant
refrigerant with a classification of class A2, A3 or A2L in compliance with ISO 817:2014 classification
As impacted by ISO 817:2014/A1:2017 and ISO 817:2014/A2:2021.
3.1.7
refrigerating system
combination of interconnected refrigerant containing parts constituting one closed refrigerant circuit in
which refrigerant is circulated for the purpose of extracting heat at the low temperature side to reject
heat at the high temperature side by changing the state of the refrigerant
3.1.8
switch temperature boiler off
T
fb,off
for a hybrid unit, lowest outdoor air temperature at which the gas or liquid fuel boiler is not providing
any heating capacity as it is switched off by the controls and heat is only provided by the heat pump
[SOURCE: EN 14825:2022, 3.1.86]
3.1.9
switch temperature heat pump on
T
hp,on
for a hybrid unit, lowest outdoor air temperature at which the heat pump starts providing heating
capacity and below which the heat capacity is only provided by the gas or liquid fuel boiler
[SOURCE: EN 14825:2022, 3.1.87]
3.1.10
control unit
device part of the unit which optimises the operation of the heat generators in terms of use of renewable
source and seasonal space heating efficiency
3.2 Symbols
Shall be according to EN 15502-1:2021, 3.2 with the following addition:
“EN 14825:2022, Table 1 applies.”.
4 Classification
Shall be according to EN 15502-2-1:2022, Clause 4.
5 Construction
5.1 General
Shall be according to EN 15502-2-1:2022, 5.1, for boilers, with the following addition for the heat pumps, to
be placed after the first alinea, as follows:
“The heat pump shall be according to the construction requirements of EN 378-2:2016, Clause 6.”.
5.2 Conversion to different gases
Shall be according to EN 15502-2-1:2022, 5.2.
5.3 Materials
Shall be according to EN 15502-2-1:2022, 5.3, with the following addition, to be placed after the first line:
“Shall be according to EN 15502-2-1:2022, 5.3.1 (for boilers) as well as EN 378-2:2016, 5.3.1 (for heat
pumps) with the following considerations.
Special care should be taken regarding material suitability for the temperature range. Some components
may be subject to a wider range of temperature conditions due to proximity of heat pump elements and
gas boiler elements.
Depending on the technology and design used for the hybrid unit, the manufacturer shall provide list of
pieces which are impacted with the temperature measurement results and shall document it in the risk
assessment following Clause 11.
For the temperature measurement, the gas boiler is set at maximal nominal calorific value as defined in
EN 15502-2-1:2022, 3.1.12.102. If for operational reason the heat pump of the hybrid unit has to run,
operating conditions shall be in line with EN 14511-4:2018, 4.2.1.2. Special care should be taken
regarding possible exposure of heat pump element to flue gases or condensate.
All parts likely to come into contact with flue gases or combustion condensate shall be constructed of
sufficiently corrosion resistant materials in line with the requirements of 5.4.13.1 of EN 15502-1:2021.
If condensate, due to contact with cold part of the hybrid unit, takes place inside the casing, this shall not:
a) affect the operational safety and the integrity of materials;
b) drop outside the hybrid unit.
In case of such condensate, a disposal system shall be adopted.”.
5.4 Method of construction
5.4.1 Design
Shall be according to EN 15502-2-1:2022, 5.4.1.
5.4.2 Checking the state of operation
Shall be according to EN 15502-2-1:2022, 5.4.2.
5.4.3 Use and service
Shall be according to EN 15502-2-1:2022, 5.4.3.
5.4.4 Connections to the gas and water pipes
Shall be according to EN 15502-2-1:2022, 5.4.4.
5.4.5 Soundness
Shall be according to EN 15502-2-1:2022, 5.4.5, with the addition of 5.4.5.201 at the end:
“5.4.5.201 Soundness of the refrigerant circuit
Any leakage of the refrigerant fluid shall not create dangerous situation for people or damage part of the
machine.
For all types of refrigerants, the combustion of the leaked refrigerant gas shall be avoided. It shall be
demonstrated by the tests defined in EN IEC 60335-2-40:2023, 22.116.”
5.4.6 Supply of combustion air and evacuation of the combustion products
Shall be according to EN 15502-2-1:2022, 5.4.6.
5.4.7 Dampers
Shall be according to EN 15502-2-1:2022, 5.4.7.
5.4.8 Air proving
Shall be according to EN 15502-2-1:2022, 5.4.8.
5.4.9 Gas/air ration controls
Shall be according to EN 15502-2-1:2022, 5.4.9.
5.4.10 Fan
Shall be according to EN 15502-2-1:2022, 5.4.10.
5.4.11 Drainage
Shall be according to EN 15502-2-1:2022, 5.4.11.
5.4.12 Operational safety in the event of failure of the auxiliary energy
Shall be according to EN 15502-2-1:2022, 5.4.12.
5.4.13 Special provision for Low Temperature Boilers and Condensing Boilers
Shall be according to EN 15502-2-1:2022, 5.4.13.
5.5 Burners
Shall be according to EN 15502-2-1:2022, 5.5.
5.6 Pressure test points
Shall be according to EN 15502-2-1:2022, 5.6.
5.7 Requirements for the application of control and safety devices
Shall be according to EN 15502-2-1:2022, 5.7.
5.8 Additional requirements for modular boilers
Shall be according to EN 15502-2-1:2022, 5.8.
6 Electrical safety
Shall be according to EN 15502-2-1:2022, Clause 6, for boilers, with the following addition for electrical heat
pumps:
“Shall be according to EN IEC 60335-2-40:2023, for the electrical heat pumps, with the following specific
conditions:
— EN IEC 60335-2-40:2023, 21.2, applies: the transport tests shall be only performed on the packaging
where the refrigerant system is included.”
7 Controls
Shall be according to EN 15502-2-1:2022, Clause 7 with the addition of 7.201 at the end:
“7.201 Optimization of primary energy consumption
Controls shall be designed to optimize the seasonal primary energy consumption (see Figure 201).
Controls shall monitor both efficiency of the gas boiler and the heat pump to select the optimum hybrid
unit operational mode.
The operational modes are defined as follows as given in Figure 201:
— Zone A: the efficiency of the heat pump is greater than the efficiency of the boiler and the output of
the heat pump is sufficient to cover the heat demand. The heat pump is used alone.
— Zone B: the efficiency of the heat pump is greater than the efficiency of the boiler and the output of
the heat pump is not sufficient to cover the heat demand. The heat pump and the boiler are used
together.
— Zone C: the efficiency of the boiler is greater than the efficiency of the heat pump. The boiler is used
alone.
Figure 201 — Boiler and heat pump range of operation – Principle of optimization of primary
energy consumption”
8 Operational requirements
8.1 General
Shall be according to EN 15502-2-1:2022, 8.1.
8.1.2.101 Pressure differences at different operational situations for type C boilers
(10)
EN 15502-2-1:2022, 8.1.2.101 is not applicable.
8.1.2.102 Pressure differences at different operational situations for type C boilers
(11)
EN 15502-2-1:2022, 8.1.2.102 is not applicable.
8.2 Soundness
Shall be according to EN 15502-2-1:2022, 8.2.
8.2.2.102 General
Shall be according to EN 15502-2-1:2022, 8.2.2.102.
8.2.2.103 Soundness of the combustion circuit of type B boilers
Shall be according to EN 15502-2-1:2022, 8.2.2.103.
8.2.3 Soundness of the water circuit
Shall be according to EN 15502-2-1:2022, 8.2.3.
8.3 Hydraulic resistance
Shall be according to EN 15502-2-1:2022, 8.3.
8.4 Heat inputs and heat outputs
Shall be according to EN 15502-2-1:2022, 8.4.
8.4.101 Additional operational requirements for type C and C boiler modules
(10) (11)
EN 15502-2-1:2022, 8.4.104 is not applicable.
8.5 Limiting temperatures
Shall be according to EN 15502-2-1:2022, 8.5.
8.5.101 External temperature of the ducts where the ducts are in contact with and or passing
through a wall
Shall be according to EN 15502-2-1:2022, 8.5.101.
8.6 Ignition, cross lighting, flame stability
Shall be according to EN 15502-2-1:2022, 8.6.
8.6.1 General
Shall be according to EN 15502-2-1:2022, 8.6.1.
8.6.2 Limit conditions
Shall be according to EN 15502-2-1:2022, 8.6.2.
8.6.2.101 Additional requirements for type C and C boiler modules
(10) (11)
EN 15502-2-1:2022, 8.6.2.101 is not applicable.
8.6.3 Special flue conditions
Shall be according to EN 15502-2-1:2022, 8.6.3.
8.6.4 Reduction of the gas rate of the ignition burner
Shall be according to EN 15502-2-1:2022, 8.6.4.
8.6.101 Resistance to draught for type B boilers
Shall be according to EN 15502-2-1:2022, 8.6.101.
8.7 Reduction of the gas pressure
Shall be according to EN 15502-2-1:2022, 8.6.3.
8.8 Defective closure of the gas valve immediately upstream of the main burner
Shall be according to EN 15502-2-1:2022, 8.8.
8.9 Pre-purge
Shall be according to EN 15502-2-1:2022, 8.9.
8.9.101 General
Shall be according to EN 15502-2-1:2022, 8.9.101.
8.9.102 Tests and test conditions for pre-purging
Shall be according to EN 15502-2-1:2022, 8.9.102.
8.9.103 Requirements for verification of the protected nature of a combustion chamber
Shall be according to EN 15502-2-1:2022, 8.9.103.
8.9.104 Test conditions for verification of the protected nature of a combustion chamber
Shall be according to EN 15502-2-1:2022, 8.9.104.
8.9.105 Requirements for verification of normal ignition in a combustible air/gas mixture for
type C boilers incorporating a fan
Shall be according to EN 15502-2-1:2022, 8.9.105.
8.9.106 Test conditions for verification of normal ignition in a combustible air/gas mixture for
type C boilers incorporating a fan
Shall be according to EN 15502-2-1:20228.9.106.
8.10 Functioning of a permanent ignition burner when a fan stops during the standby
time
Shall be according to EN 15502-2-1:2022, 8.10.
8.11 Adjustment, control and safety devices
Shall be according to EN 15502-2-1:2022, 8.11, but subclauses 8.11.6.2.101 and 8.11.6.2.102 are not
applicable.
8.11.7 Gas pressure regulator
Shall be according to EN 15502-2-1:2022, 8.11.7.
8.11.8 Thermostats ans water temperature limiting devices
Shall be according to EN 15502-2-1:2022, 8.11.8.
8.11.101 Air proving
Shall be according to EN 15502-2-1:2022, 8.11.101.
8.12 Carbon monoxide
Shall be according to EN 15502-2-1:2022, 8.12.
8.13 NOx
Shall be according to EN 15502-2-1:2022, 8.13, with the following addition for the hybrid unit:
“
The NOx emission of the hybrid unit is calculated according to the sharing between electrical heat pump
and gas boiler as defined by the related test conditions according to 9, and given by the following formula:
annual fossil energy consumption according to EN 14825:2022, 7.3.4
( )
NOx,, hybrid unit= NOx 0 gas boiler
reference annual heating demand QH according to EN 14825:2022, 3.15
( )
.”
8.14 Special provisions for boilers intended to be installed in a partially protected place
Shall be according to EN 15502-2-1:2022, 8.14.
8.15 Formation of combustion products
Shall be according to EN 15502-2-1:2022, 8.15.
8.16 Temperature of combustion products
Shall be according to EN 15502-2-1:2022, 8.16.
8.17 Sound power level
Shall be according to EN 15502-2-1:2022, 8.17, with the following addition:
“The technical documentation shall provide sound power level of the hybrid unit measured at the test
conditions given in Table 201, as follows:
1) for a hybrid unit installed indoors and ducted on the outdoor air side, both indoors and outdoors
sound power levels shall be provided;
2) for a hybrid unit with parts installed indoors and outdoors, both indoors and outdoors sound power
levels shall be provided;
3) for a hybrid unit installed outdoors, only one value for the sound power level outdoors shall be
provided.
Table 201 — Acoustic testing conditions for hybrid unit
Heat source temperature Water supply temperature Heat pump with compressor(s)
and fan(s) settings from
EN 14825:2022
a
Medium temperature application as declared at condition F (outdoor
7(6)°C
(55 °C) or Low temperature temperature T )
fb,off
application (35 °C)
a
In case the settings declared at T condition cannot be achieved at +7(6)°C, the manufacturer shall provide the
fb,off
maximum outdoor temperature at which declared settings of T can occur. The boiler shall remain off during the test,
fb,off
whatever the outdoor temperature condition.
The technical documentation may refer to EN 12102-1:2017 for identifying the sound power levels to be
measured as well as for the installation of the outdoor part and/or for the duct end correction for ducted
units.”.
8.101 Mechanical resistance and stability of ducts, terminal and fitting pieces
Shall be according to EN 15502-2-1:2022, 8.101.
8.102 Requirements for plastic in the combustion product evacuation ducts, terminals and
fitting pieces of the boilers
Shall be according to EN 15502-2-1:2022, 8.102.
8.103 Requirements for elastomeric seals and elastomeric sealants in the combustion product
evacuation ducts, terminals and fitting pieces
Shall be according to EN 15502-2-1:2022, 8.103.
8.104 Additional requirements for non-return valve for type C boilers and C boiler
(10) (11)
modules
EN 15502-2-1:2022, 8.104 is not applicable.
8.105 Additional requirements for the evaluation of the maximum heat input of the common
duct system of type C boilers
(11)
EN 15502-2-1:2022, 8.105 is not applicable.
9 Useful efficiencies
Shall be according to EN 15502-2-1:2022, Clause 9, for boilers, with the following addition:
“For the individual test conditions of the heat pumps, calculation and testing performances,
EN 14511-3:2018 including the defrosting cycle handling, shall apply.
For the calculation of the seasonal space heating efficiency, EN 14825:2022 shall apply with the following
additional tests conditions when applicable:
— temperature application (very high temperature application) as defined in Table 202.
Table 202 — Part load conditions for air-to-water (brine) units in temperature application for
the reference heating seasons
Outdoor heat
Indoor heat exchanger
exchanger
Part Load Ratio
Inlet dry (wet) bulb
Fixed
d
Variable outlet
in %
temperature
outlet
°C
°C
°C
Outdoor All
Formula A W C Exhaust air A W C
air climates
(−7 - 16) /
a a a
A 88 n/a 61 −7(−8) 20(12) n/a
/ 80 / 75 / 59
(T −16)
designh
(+2 - 16) /
a a a a
B 54 100 37 2(1) 20(12) / 80 / 59 / 80 / 47
(T −16)
designh
(+7 - 16) /
a a a a
C 35 64 24 7(6) 20(12)
/ 80 / 48 / 64 / 41
(T −16)
designh
(+12 - 16) /
a a a a
D 15 29 11 12(11) 20(12) / 80 / 35 / 46 / 33
(T −16)
designh
a a b a b a b
(T - 16) / (T −16) T
E 20(12)
/ 80 / / /
hp,off designh hp,off
a a c a c a c
(T - 16) / (T - 16) T
F 20(12)
/ 80 / / /
fb,off designh fb,off
(−15 - 16) /
a a
G n/a n/a 82 −15 20(12) / 80 n/a n/a / 69
(T −16)
designh
a
With the flow rate as determ
...
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