FprEN 16905-2
(Main)Gas-fired endothermic engine driven heat pumps - Part 2: Safety
Gas-fired endothermic engine driven heat pumps - Part 2: Safety
This part of FprEN 16905 specifies the safety requirements, the safety test conditions and the safety test methods of gas-fired endothermic engine driven heat pumps for heating and/or cooling mode including the engine heat recovery, to be used outdoors.
This document specifies minimum operating requirements which ensure that the products are fit for the use designated by the manufacturer when used for space heating and/or cooling.
This document is used in conjunction with:
a) the terms and conditions, EN 16905-1:2023;
b) the test conditions, EN 16905-3:2024
c) the test methods, FprEN 16905-4:2025;
d) the calculation of seasonal performances in heating and cooling mode, EN 16905-5:2022;
e) the heat pump, EN 14511-4:2022, EN 378-1:2016+A1:2020, EN 378-2:2016, EN 378 3:2016+A1:2020, EN 378-4:2016+A1:2019 and EN 14825:2018;
f) electrical safety, EN 60335-1:2012, EN 60335-2-102:2016, EN 60335-2-40:2003 and EN 60204 1:2019.
This document only applies to GEHP appliances with a maximum heat input (based on net calorific value) not exceeding 70 kW at standard rating conditions.
This document only applies to GEHP appliances under categories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P and II2Er3P according to EN 437:2021.
This document only applies to GEHP appliances:
g) that have gas fired endothermic engines under the control of fully automatic control systems;
h) that have closed system refrigerant circuits in which the refrigerant does not come into direct contact with the fluid to be cooled or heated;
i) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does not exceed 105 °C during normal operation;
j) where the maximum operating pressure in the:
1) heating water circuit (if installed) does not exceed 6 bar;
2) domestic hot water circuit (if installed) does not exceed 10 bar.
This document is applicable to GEHP appliances only when used for space heating or space cooling or for refrigeration, with or without heat recovery.
NOTE This document provides requirements for GEHP appliances with known constructions. For GEHP appliances with any alternative constructions, which are not fully be covered by this standard, the risk associated with this alternative construction needs to be assessed.
Gasbefeuerte endothermische Motor-Wärmepumpen - Teil 2: Sicherheit
Dieser Teil von prEN 16905 legt die Sicherheitsanforderungen, die Sicherheitsprüfbedingungen und die Sicherheitsprüfverfahren von gasbefeuerten endothermischen Motor Wärmepumpen für den Heiz und/oder Kühlbetrieb einschließlich der Wärmerückgewinnung des Motors fest, die im Freien zu verwenden sind.
Dieses Dokument legt Mindestbetriebsanforderungen fest, die sicherstellen, dass die Produkte bei Verwen¬dung für die Raumheizung/ kühlung für die vom Hersteller ausgewiesene Nutzung geeignet sind.
Dieses Dokument ist anzuwenden in Verbindung mit:
a) den Begriffen und Bedingungen nach EN 16905 1:2017;
b) den Prüfbedingungen nach EN 16905 3:2017;
c) den Prüfverfahren nach EN 16905 4:2017;
d) der Berechnung der saisonalen Effizienzkennzahlen im Heiz und Kühlbetrieb nach EN 16905 5:2017;
e) der Wärmepumpe nach prEN 14511 4:2021, EN 378 1:2016+A1:2020, EN 378 2:2016, EN 378 3:2016+A1:2020, EN 378 4:2016+A1:2019 und EN 14825:2018;
f) der elektrischen Sicherheit nach EN 60335 1:2012, EN 60335 2 102:2016, EN 60335 2 40:20032 und EN 60204 1:2018.
Dieses Dokument gilt ausschließlich für GEHP Systeme mit einer Höchst Wärmebelastung von 70 kW (bezogen auf den Heizwert, en: net calorific value) bei Norm Nennbedingungen.
Dieses Dokument gilt ausschließlich für GEHP Geräte der Kategorien I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P und II2Er3P nach EN 437:2021.
Dieses Dokument gilt ausschließlich für GEHP Systeme:
a) die über gasbefeuerte endothermischen Motoren verfügen, die durch vollständig automatisierte Rege¬lungen gesteuert werden;
b) die über geschlossene Kühlkreislaufsysteme verfügen, in denen das Kühlmittel nicht direkt mit dem zu kühlenden oder zu erwärmenden Fluid in Berührung kommt;
c) bei denen die Temperatur des Wärmeübertragungsmediums im Heizsystem (Heizungswasserkreislauf) im Normalbetrieb 105 °C nicht überschreitet;
d) bei denen der höchste Betriebsdruck im:
1) Heizungswasserkreislauf (falls installiert) 6 bar nicht überschreitet;
2) Warmwasserbereitungskreislauf für Nutzwasser (falls installiert) 10 bar nicht überschreitet.
Dieses Dokument gilt ausschließlich für GEHP Systeme, die zur Raumbeheizung oder kühlung oder zur Kälteerzeugung mit oder ohne Wärmerückgewinnung angewendet werden.
Dieses Dokument gilt für GEHP Systeme, die für eine Typprüfung vorgesehen sind. Anforderungen an nicht typgeprüfte GEHP Systeme wären ein Thema für weitere Überlegungen.
Pompes à chaleur à moteur endothermique alimenté au gaz - Partie 2 : Sécurité
La présente partie de la prEN 16905 spécifie les exigences de sécurité, les conditions d'essai de sécurité et les méthodes d'essai de sécurité des pompes à chaleur à moteur endothermique alimenté en gaz pour le mode chauffage et/ou refroidissement, y compris la récupération de la chaleur du moteur, destinées à être utilisées à l'extérieur.
Le présent document spécifie les exigences minimales de fonctionnement qui permettent d'assurer que les produits sont adaptés à l'usage prévu par le fabricant en cas d'utilisation pour le chauffage et/ou le refroidissement de locaux.
Le présent document est à être utilisé conjointement avec :
a) les termes et définitions, EN 16905-1:2017 ;
b) les conditions d'essai, EN 16905-3:2017 ;
c) les méthodes d'essai, EN 16905-4:2017 ;
d) le calcul des performances saisonnières en modes chauffage et refroidissement, EN 16905-5:2017 ;
e) la pompe à chaleur, prEN 14511-4:2021, EN 378-1:2016+A1:2020, EN 378-2:2016, EN 378 3:2016+A1:2020, EN 378-4:2016+A1:2019 et EN 14825:2018 ;
f) la sécurité électrique, EN 60335-1:2012, EN 60335-2-102:2016, EN 60335-2-40:20032 et EN 60204 1:2018.
Le présent document s'applique uniquement aux appareils GEHP dont le débit calorifique maximal (dérivé du pouvoir calorifique inférieur) ne dépasse pas 70 kW dans les conditions de performance nominale.
Le présent document s'applique uniquement aux appareils GEHP des catégories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P et II2Er3P de l'EN 437:2021.
Le présent document s'applique uniquement aux appareils GEHP :
a) qui sont équipés de moteurs endothermiques alimentés au gaz régulés par des systèmes de régulation entièrement automatisés ;
b) qui comportent des circuits fermés de réfrigérant dans lesquels le réfrigérant n'entre pas en contact direct avec le fluide à refroidir ou à chauffer ;
c) dans lesquels la température du fluide caloporteur du système de chauffage (circuit d'eau de chauffage) ne dépasse pas 105 °C dans les conditions normales de fonctionnement ;
d) dans lesquels la pression maximale de fonctionnement :
1) ne dépasse pas 6 bar dans le circuit d'eau de chauffage (le cas échéant) ;
2) ne dépasse pas 10 bar dans le circuit d'eau chaude sanitaire (le cas échéant).
Le présent document s'applique aux appareils GEHP uniquement en cas d'utilisation pour le chauffage ou le refroidissement de locaux ou pour la réfrigération, avec ou sans récupération de chaleur.
Le présent document s'applique aux appareils GEHP qui sont destinés aux essais de type. Les exigences relatives aux appareils GEHP non soumis à des essais de type pourraient appeler des considérations supplémentaires.
Toplotna črpalka s plinsko gnanim motorjem z notranjim zgorevanjem - 2. del: Varnost
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2022
Toplotna črpalka s plinsko gnanim motorjem z notranjim zgorevanjem - 2. del:
Varnost
Gas-fired endothermic engine driven heat pumps - Part 2: Safety
Gasbefeuerte endothermische Motor-Wärmepumpen - Teil 2: Sicherheit
Pompes à chaleur à moteur endothermique alimenté au gaz - Partie 2: Sécurité
Ta slovenski standard je istoveten z: prEN 16905-2
ICS:
27.080 Toplotne črpalke Heat pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 16905-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021
ICS 27.080 Will supersede EN 16905-2:2020
English Version
Gas-fired endothermic engine driven heat pumps - Part 2:
Safety
Pompes à chaleur à moteur endothermique alimenté Gasbefeuerte endothermische Motor-Wärmepumpen -
au gaz - Partie 2: Sécurité Teil 2: Sicherheit
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 299.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16905-2:2021 E
worldwide for CEN national Members.
prEN 16905-2:2021 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 9
4 Classification . 9
4.1 General . 9
4.2 Classification of GEHP appliances . 9
4.3 GEHP appliance classification according to the maximum water side operating
pressure (PMS): . 10
5 Design requirements . 10
5.1 Structure . 10
5.2 Material . 13
5.3 EMC / Electrical requirements . 20
6 Operational requirements . 20
6.1 General requirements . 20
6.2 Soundness . 21
6.3 Heat input at standard rating conditions . 22
6.4 Limit temperatures . 22
6.5 Limit operating conditions . 24
6.6 Insulation resistance . 24
6.7 Transient overvoltage . 24
6.8 Withstand voltage . 24
6.9 Waterproof performance . 24
6.10 Sound power level . 25
6.11 Engine perform . 25
6.12 Power failure . 26
6.13 Abnormalities . 27
6.14 Starting current . 27
7 Test methods . 27
7.1 General test conditions . 27
7.2 Soundness . 29
7.3 Heat input at standard rating conditions . 31
7.4 Limit temperatures . 31
7.5 Limit operating conditions . 32
7.6 Insulation resistance test . 33
7.7 Transient overvoltage test . 33
7.8 Withstand voltage test . 34
7.9 Waterproof performance test . 34
7.10 Sound power level test . 34
7.11 Engine performance . 34
7.12 Power failure test . 35
7.13 Abnormalities test . 35
7.14 Starting current test . 35
prEN 16905-2:2021 (E)
8 Risk assessment . 35
9 Marking and instructions . 36
9.1 GEHP appliance marking . 36
9.2 Instructions . 38
9.3 Presentation . 40
Annex A (informative) Calculation of conversion of NO . 41
x
A.1 General . 41
Annex B (normative) Engine startup test method . 42
B.1 General . 42
B.2 Test condition . 42
B.3 Test method . 42
Annex C (normative) CO concentration test method . 43
C.1 General . 43
C.2 Test condition . 43
Annex D (normative) NO concentration test method . 46
x
D.1 General . 46
D.2 Engine rpm equivalent method . 46
D.3 Test condition . 46
D.4 Conversion . 47
D.5 Accuracies of measurement . 48
Annex E (normative) Power failure test method. 49
E.1 General . 49
E.2 Test method . 49
Annex F (informative) Examples for marking . 50
F.1 Data-plate (see 9.1.1) . 50
F.2 Additional data-plate (see 9.1.2). 50
Annex G (informative) Examples for NO calculation . 51
x
G.1 E calculation . 51
rpm equivalvent
ppm to mg/kWh conversation . 51
G.2 NOx
G.3 Temperature and humidity correction formula calculation . 51
Annex ZA (informative) Relationship between this European Standard and the
requirements of Commission Regulation (EU) No 2016/426 aimed to be covered . 52
Annex ZB (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 813/2013 aimed to be covered . 55
Annex ZC (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 2016/2281 aimed to be covered. 56
Bibliography . 57
prEN 16905-2:2021 (E)
European foreword
This document (prEN 16905-2:2021) has been prepared by Technical Committee CEN/TC 299 “Gas-
fired sorption appliances, indirect fired sorption appliances, gas-fired endothermic engine heat pumps
and domestic gas-fired washing and drying appliances”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 16905-2:2020.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, ZB and ZC, which are
an integral part of this document.
In comparison with the previous edition, the following technical modifications have been made:
— Editorial and technical changes throughout the draft and in Annex ZA, ZB and ZC in order to align
the text to the Ecodesign Requirements stated in Commission Regulation (EU) No 2016/426.
EN 16905 comprises the following parts under the general title, Gas-fired endothermic engine driven
heat pumps:
— Part 1: Terms and definitions;
— Part 2: Safety;
— Part 3: Tests conditions;
— Part 4: Tests methods;
— Part 5: Calculation of seasonal performances in heating and cooling mode.
prEN 16905-2:2021 (E)
Introduction
The GEHP appliances having their condenser cooled by air and by the evaporation of external additional
water are not covered by this European Standard.
Single split and multisplit systems are covered by this European Standard.
The GEHP appliances can have one or more primary or secondary functions.
This European Standard specifies the requirements, test methods and test conditions concerning, in
particular, the construction, safety, fitness for purpose, and rational use of energy, for the rating and
performance calculation of air conditioners and heat pumps using either air, water or brine as heat
transfer media, with gas-fired endothermic engine driven compressors when used for space heating,
cooling and refrigeration, hereafter referred to as "GEHP appliance".
EN 16905-2:2020 has been prepared to address the essential requirements of the European Regulation
(EU) 2016/426 relating to appliances burning gaseous fuels and repealing Directive 2009/142/EC (see
EN 16905-2:2020, Annex ZA).
EN 16905-1:2017, EN 16905-2:2020, EN 16905-3:2017, EN 16905-4:2017 and EN 16905-5:2017 are
linked to the Energy Related Products Directive (2009/125/EC) in terms of tests conditions, tests
methods and seasonal performances calculation methods under Mandate M/535; (see
EN 16905-3:2017, Annex ZA, EN 16905-4:2017, Annex ZA, EN 16905-5:2017, Annex ZA and
EN 16905-2:2020, Annexes ZB and ZC).
These documents will be reviewed whenever new mandates could apply.
prEN 16905-2:2021 (E)
1 Scope
This part of prEN 16905 specifies the safety requirements, the safety test conditions and the safety test
methods of gas-fired endothermic engine driven heat pumps for heating and/or cooling mode including
the engine heat recovery, to be used outdoors.
This document specifies minimum operating requirements which ensure that the products are fit for
the use designated by the manufacturer when used for space heating and/or cooling.
This document is to be used in conjunction with:
a) the terms and conditions, EN 16905-1:2017;
b) the test conditions, EN 16905-3:2017;
c) the test methods, EN 16905-4:2017;
d) the calculation of seasonal performances in heating and cooling mode, EN 16905-5:2017;
e) the heat pump, prEN 14511-4:2021, EN 378-1:2016+A1:2020, EN 378-2:2016,
EN 378-3:2016+A1:2020, EN 378-4:2016+A1:2019 and EN 14825:2018;
f) electrical safety, EN 60335-1:2012, EN 60335-2-102:2016, EN 60335-2-40:2003 and
EN 60204-1:2018.
This document only applies to GEHP appliances with a maximum heat input (based on net calorific
value) not exceeding 70 kW at standard rating conditions.
This document only applies to GEHP appliances under categories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL,
I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P,
II2ELL3B/P, II2L3P, II2H3P, II2E3P and II2Er3P according to EN 437:2021.
This document only applies to GEHP appliances:
a) that have gas fired endothermic engines under the control of fully automatic control systems;
b) that have closed system refrigerant circuits in which the refrigerant does not come into direct
contact with the fluid to be cooled or heated;
c) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does
not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the:
1) heating water circuit (if installed) does not exceed 6 bar;
2) domestic hot water circuit (if installed) does not exceed 10 bar.
This document applies to GEHP appliances only when used for space heating or space cooling or for
refrigeration, with or without heat recovery.
This document is applicable to GEHP appliances that are intended to be type tested. Requirements for
GEHP appliances that are not type tested would need to be subject to further consideration.
prEN 16905-2:2021 (E)
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 161:2011+A3:2013, Automatic shut-off valves for gas burners and gas appliances
EN 378-2:2016, Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2:
Design, construction, testing, marking and documentation
EN 437:2021, Test gases - Test pressures - Appliance categories
EN 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas equipment
CR 1404:1994, Determination of emissions from appliances burning gaseous fuels during type-testing
EN 1561:2011, Founding - Grey cast irons
EN 10029:2010, Hot-rolled steel plates 3 mm thick or above - Tolerances on dimensions and shape
EN 10226-1:2004, Pipe threads where pressure tight joints are made on the threads - Part 1: Taper
external threads and parallel internal threads - Dimensions, tolerances and designation
EN 10226-2:2005, Pipe threads where pressure tight joints are made on the threads - Part 2: Taper
external threads and taper internal threads - Dimensions, tolerances and designation
EN 12102-1:2017, Air conditioners, liquid chilling packages, heat pumps, process chillers and
dehumidifiers with electrically driven compressors - Determination of the sound power level - Part 1: Air
conditioners, liquid chilling packages, heat pumps for space heating and cooling, dehumidifiers and
process chillers
EN 12102-2:2019, Air conditioners, liquid chilling packages, heat pumps, process chillers and
dehumidifiers with electrically driven compressors - Determination of the sound power level - Part 2: Heat
pump water heaters
EN 14800:2007, Corrugated safety metal hose assemblies for the connection of domestic appliances using
gaseous fuels
EN 16436-1:2014+A3:2020, Rubber and plastics hoses, tubing and assemblies for use with propane and
butane and their mixtures in the vapour phase - Part 1: Hoses and tubings
EN 16905-1:2017, Gas-fired endothermic engine driven heat pumps - Part 1: Terms and definitions
EN 16905-3:2017, Gas-fired endothermic engine driven heat pumps - Part 3: Test conditions
EN 16905-4:2017, Gas-fired endothermic engine driven heat pumps - Part 4: Test methods
EN 16905-5:2017, Gas-fired endothermic engine driven heat pumps - Part 5: Calculation of seasonal
performances in heating and cooling mode
EN IEC 55014-1:2021, Electromagnetic compatibility - Requirements for household appliances, electric
tools and similar apparatus - Part 1: Emission
prEN 16905-2:2021 (E)
EN IEC 55014-2:2021, Electromagnetic compatibility - Requirements for household appliances, electric
tools and similar apparatus - Part 2: Immunity - Product family standard
EN 60335-1:2012 , Household and similar electrical appliances – Safety – Part 1: General requirements
EN 60335-2-40:2003 , Household and similar electrical appliances - Safety - Part 2-40: Particular
requirements for electrical heat pumps, air-conditioners and dehumidifiers
EN 60335-2-102:2016, Household and similar electrical appliances - Safety - Part 2-102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections
EN 60529:1991 , Degrees of protection provided by enclosures (IP Code)
EN 61000-3-2:2014, Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A per phase)
EN 61000-3-3:2013, 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
EN IEC 61000-3-11:2019, Electromagnetic compatibility (EMC) - Part 3-11: Limits - Limitation of voltage
changes, voltage fluctuations and flicker in public low-voltage supply systems - Equipment with rated
current ≤ 75 A and subject to conditional connection
EN 61000-3-12:2011, Electromagnetic compatibility (EMC) - Part 3-12: Limits - Limits for harmonic
currents produced by equipment connected to public low-voltage systems with input current > 16 A and <=
75 A per phase
EN IEC 61000-6-1:2019, Electromagnetic compatibility (EMC) - Part 6-1: Generic standards - Immunity
standard for residential, commercial and light-industrial environments
EN 61000-6-3:2007, Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
standard for residential, commercial and light-industrial environments
EN ISO 2553:2019, Welding and allied processes - Symbolic representation on drawings - Welded joints
(ISO 2553:2019, Corrected version 2021-09)
EN ISO 3166-1:2020, Codes for the representation of names of countries and their subdivisions - Part 1:
Country code (ISO 3166-1:2020)
EN ISO 4063:2010, Welding and allied processes - Nomenclature of processes and reference numbers (ISO
4063:2009, Corrected version 2010-03-01)
As impacted by EN 60335-1:2012/A11:2014, EN 60335-1:2012/AC:2014, EN 60335-1:2012/A13:2017,
EN 60335-1:2012/A1:2019, EN 60335-1:2012/A2:2019, EN 60335-1:2012/A14:2019 and
EN 60335-1:2012/A15:2021.
As impacted by EN 60335-2-40:2003/A11:2004, EN 60335-2-40:2003/A12:2005,
EN 60335-2-40:2003/A1:2006, EN 60335-2-40:2003/Cor.:2006, EN 60335-2-40:2003/A2:2009,
EN 60335-2-40:2003/Cor.:2010, EN 60335-2-40:2003/A13:2012 and EN 60335-2-40:2003/A13:2012/AC:2013.
As impacted by EN 60529:1991/A1:2000 and EN 60529:1991/A2:2013.
prEN 16905-2:2021 (E)
EN ISO 7010:2020, Graphical symbols - Safety colours and safety signs - Registered safety signs (ISO
7010:2019, Corrected version 2020-06)
ISO 857-2:2005, Welding and allied processes - Vocabulary - Part 2: Soldering and brazing processes and
related terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16905-1:2017 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
maximun water operating pressure
PMS
maximum water operating pressure at which the GEHP appliance can be used, in bars given by the
symbol “PMS”, followed by the equals sign, the numerical value and the unit “bar
3.2
Ignition Safety Time
TSA
time elapsing between the start and the stop of the gas supply to internal combustion engine in the
event of ignition not taking place
3.3
Maximum Ignition Safety Time
TSA max
ignition safety time measured under the least favourable conditions of ambient temperature and
variation in supply voltage
4 Classification
4.1 General
GEHP appliances can be classified according to:
— the gases they use;
— the unit structure;
— air blowing system.
4.2 Classification of GEHP appliances
4.2.1 Classification of gases
Gases are classified into three families, possibly divided into groups according to the value of the Wobbe
index. Families and groups of gas used in this standard are in accordance with those of the
nd rd
EN 437:2021. This standard is for GEHP appliances working with 2 and 3 gas family only.
prEN 16905-2:2021 (E)
4.2.2 Classification according to the unit structure
4.2.2.1 Single split
Single GEHP appliance in combination with single heating/cooling device to form a discrete matched
functional unit.
4.2.2.2 Multi split
Single GEHP appliance with a single refrigerant circuit in combination with multiple heating/cooling
devices.
4.2.3 Classification according to the air blowing system
4.2.3.1 Non ducted type
Air introduced from the space containing the unit and discharged within the same space.
4.2.3.2 Ducted type
Air introduced from the space containing the unit and discharged outside this space.
4.3 GEHP appliance classification according to the maximum water side operating
pressure (PMS):
— pressure class 1: PMS = 1 bar
— pressure class 2: PMS = 3 bar
— pressure class 3: 3 bar < PMS ≤ 6 bar
NOTE Internal cooling circuits in GEHP appliances are not considered under this classification, e.g. internal
cooling circuits for internal combustion engine in GEHP appliances.
5 Design requirements
5.1 Structure
5.1.1 General
The structure of the equipment shall satisfy the following requirements in consideration of safety and
durability:
a) The edge of the part which people touch with hands in service or in the case of maintenance and
checking shall be sufficiently smooth.
b) The control section and electric section shall not be influenced by the weather condition.
c) The thermal insulation material, etc. shall not produce detachment or omission in normal use.
d) The movable parts of the blower, etc. shall not easily come into contact with a human body in
normal use.
e) The thermal insulation material, etc. used near (less than 50 mm) the electric component section
shall be fire-resistant, except in cases where there is no possibility that danger such as electric
shock, fire arises if the thermal insulation material, etc. burns.
f) The confirmation of drain of the condensed water can be easily performed.
prEN 16905-2:2021 (E)
g) The connecting port, etc. for refrigerant collection shall be provided.
h) The refrigerant circuit shall be safe for an abnormal pressure rise.
i) The GEHP appliance shall be equipped with control and safety devices for start, operation and
control of the gas supply.
j) These devices shall ensure the automatic start and the automatic monitoring for the operating
functions of the engine and the GEHP appliance as well as the gas supply.
k) In case of failure of the normal operating functions (malfunctions), the gas supply shall be cut off, if
need be, with lock-out in accordance with the operating programme.
l) The functional safety specification for control and supervision as well as for the automatic restart
shall be part of the design documents.
m) The design of the control and safety system shall be such that it is not possible to perform two or
more actions which are unacceptable in combination. The order of the actions shall be fixed in such
a manner that it is not possible to change it.
n) Any parts of a GEHP appliance which are not intended to be altered by the user or the installer shall
be protected in an appropriate manner. Paint may be used for this purpose provided that it
withstands the temperature to which it is subjected during normal operation of the GEHP
appliance.
o) GEHP appliances shall be so designed and constructed that gas release at any state of operation is
limited in order to avoid a dangerous accumulation of unburned gas in the GEHP appliance.
5.1.2 Structure of each part
5.1.2.1 Gas inlet connection
The gas inlet connection shall be as follows:
a) The gas inlet connection portshall be exposed to the outside or shall be located so that it is able to
be easily identified visually.
b) For the screw threads of the gas connecting port, those specified in EN 10226-1:2004 or
EN 10226-2:2005 shall be used.
5.1.2.2 Automatic shut-off valve
The automatic shut-off valve shall be as follows.
a) The gas passage to an engine shall be closed by two or more automatic shut-off valves provided in
series at the time of engine stop.
b) Each automatic shut-off valve shall have the independent function.
c) Each automatic shut-off valve shall comply with the requirement of EN 161:2011+A3:2013.
d) Composition of the automatic shut-off valves shall be, at least, C+C or B+J.
e) For non-volatile lockout two or more valves shall be closed simultaneously.
prEN 16905-2:2021 (E)
In response to a control device, if the delay between the signals to close the two valves is not greater
than 1 s, the signals are considered to be simultaneous.
5.1.2.3 Gas carrying circuit
The gas carrying circuit shall be as follows:
a) The gas carrying circuit used for the part which becomes negative pressure shall have sufficient
strength to negative pressure. Under the normal operation condition, each part of the gas carrying
circuit shall be free from abnormalities such as deformation during the period from the close of the
gas shut off valve in the gas inlet side to the stop of the engine.
b) The surface treatment such as a tinning shall be given to the inner surface of the copper pipe of 2
mm or less in inner diameter used for a gas carrying circuit.
c) The gas carrying circuit used for the part which becomes positive pressure shall have sufficient
strength to positive pressure.
d) When there is leakage of fuel gas from the gas carrying circuit used for the part which becomes
positive pressure, the GEHP appliance shall be structured so that the leaked fuel gas shall comply
with the requirements of the soundness gas carrying circuit specified in 6.2.1.
e) Gas carrying circuit shall be sound so that at any state of operation unburned gas in the GEHP
appliance does not accumulate.
5.1.2.4 Soundness of the engine
Soundness of the engine shall be ensured according to the following items:
The leakage of the engine shall
a) be ignited immediately with the mixture designed to be burned in the engine, or
b) be contained by the entire engine being surrounded by combustion air or cooling water, or
c) be released easily outside into atmosphere, or
d) lead to non-operation of the engine under such leakage conditions.
5.1.2.5 Combustion products circuit
The combustion products circuit shall be as follows:
a) The combustion products circuit shall have the structure to endure the temperature of combustion
products and vibration of an engine;
b) The ducts, bends, if any, and the terminal or fitting piece shall fit together correctly and shall form a
stable assembly. Parts intended to be dismantled for periodic servicing shall be designed and
arranged so that soundness is assured after reassembly. Any fitting piece shall allow a sound
connection to be made to the system intended for the evacuation of combustion products and
supply of air;
c) The opening of combustion products exhaust outlet shall be structured so that a steel ball of 16 mm
in diameter by applying a force of 5 N in every possible position cannot enter or birds, etc. cannot
invade;
d) Condensation shall not affect the operational safety, then the combustion products circuit shall
have the structure which is capable of discharging condensation drain without blocking the
combustion products;
prEN 16905-2:2021 (E)
e) All parts of the heat exchanger(s) and other parts of the GEHP appliance likely to come into contact
with condensate shall be constructed of corrosion resistant materials or materials protected by a
suitable coating and maintained in accordance with the manufacturer's instructions;
f) If the technical documentation states the chemical composition of the condensate, the composition
shall be verified at the end of the test under rating conditions in cooling mode according to
EN 16905-3:2017, 4.2.
5.1.2.6 Casing
The casing shall be as follows:
a) The opening of casing to intake air for combustion shall be structured so that a steel ball of 16 mm
in diameter when applied with a force of 5 N cannot enter.
b) The panel for checking and maintenance shall have the structure to endure the intended use of
attachment and detachment.
5.1.2.7 Motor for engine startup
The motor for engine startup shall have protection device (for example, fuse) to prevent overheat.
5.1.2.8 Engine ignition device
The engine ignition device shall be structured so that the noise radiation (radio noise) generated by the
engine ignition device gives no interference to other equipment.
5.1.2.9 Engine protective device
The engine protective device shall be as follows:
a) When the number of rotations of an engine exceeds that designated by the design documentation,
the engine protective device shall have the function in which the engine stops and the gas carrying
circuit is automatically closed.
b) When the engine oil decreases to the degree indicated in the design documentation, the engine
protective device shall have the function in which the engine stops and the gas carrying circuit is
automatically closed.
c) When the engine cooling water (anti-freeze solution) exceeds the temperature indicated in the
design documentation, the engine protective device shall have the function in which the engine
stops and the gas carrying circuit is automatically closed.
5.1.3 Refrigerant circuit
The strength of each part of refrigerant circuit shall conform to the specification of EN 378-2:2016 and
have the structure to endure vibration of an engine, etc. sufficiently.
5.1.4 Engine lubricant oil circuit
In case of leakage from the lubricant oil circuit, there shall be no escape of oil to outside of GEHP
appliance.
5.2 Material
5.2.1 Domestic hot water circuit
The materials of the parts containing domestic water shall not affect the quality of the domestic water
in respect of either health or taste.
prEN 16905-2:2021 (E)
The whole of the domestic hot water circuit shall be made up of corrosion resistant materials or shall be
protected against corrosion.
5.2.2 Gas carrying circuit
The material used for the part which contains fuel gas shall be as follows:
a) Either metallic material or other materials fulfilling the following requirements:
1) anti-corrosion or of which the surface is given an anti-corrosion treatment,
2) quality to sufficiently endure the pressure and components of a fuel gas and shall be conform to
the specification of EN 16436-1:2014+A3:2020 → (for rubber).
b) The metal braided flexible hose shall be that which conforms to EN 14800:2007.
c) The material of the gas carrying circuit of the part in which the gas pressure downstream from the
regulator becomes negative pressure shall sufficiently endure the negative pressure.
d) Rubber materials of packing and sealing used in gas carring circuit shall comply with the relevant
requirements of Class A2 as defined in EN 549:2019.
5.2.3 Combustion products circuit
The material used for the combustion products circuit shall be as follows.
a) The metallic material shall be heatproof and anti-corrosion or of which the surface is given an anti-
corrosion treatment.
b) The material other than metal shall be resistant to combustion gas and drain water.
5.2.4 Thermal insulation material, etc.
The thermal insulation material, sound absorbing material, etc. of the periphery of an engine shall be
that which does not burn or naturally burns out within 10 s when it burns.
5.2.5 Materials and thicknesses of walls or tubes under water pressure of pressure class 3
5.2.5.1 General
The characteristics of the materials and the thicknesses of walls under pressure shall comply with the
requirements of 5.2.5.2, 5.2.5.3 and 5.2.5.4. If other materials and/or other thicknesses are used, these
shall have an equivalent level of fitness for purpose.
5.2.5.2 Materials
Materials for parts under pressure shall be appropriate for their duty and envisaged use.
The following materials satisfy these criteria:
— steels that have the properties and chemical composition detailed in Table 1;
— cast irons that have the mechanical properties detailed in Table 2;
— the non-ferrous materials detailed in Table 3 and Table 4.
5.2.5.3 Thickness
The minimum wall thicknesses of parts under water pressure are given in Table 5 and Table 6.
For rolled steel the tolerances are given in EN 10029:2010.
prEN 16905-2:2021 (E)
The thicknesses of cast walls given in the production drawings shall not be less than the nominal
minimum thicknesses given in Table 6 for parts of cast iron or of cast materials which are subjected to
pressure. The actual minimum thickness of the GEHP appliance sections and of parts subjected to
pressure shall be greater than 0,8 times those given in the drawings.
5.2.5.4 Welded seams and welding fillers
Materials shall be suitable for welding. Examples of materials are given in Table 1 and do not require
additional heat treatment for welding.
Welded seams shall show no cracks or bonding faults and butt welded seams shall be faultlessly welded
over the whole cross-section.
Single-sided fillet welds and half Y-welds without full penetration into the base metal shall not be
subjected to bending stresses. Double fillet welds are permissible if sufficiently cooled.
Corner welds, edge welds and similar welds which are subject to considerable bending stresses are to
be avoided.
For welded-in longitudinal stays, stay tubes or stay bolts, the shearing cross-section of the fillet weld
shall be at least 1,25 times the required cross-section of the bolt or stay tube.
Details of the welds mentioned are given in Table 7. Welding fillers shall permit a joint appropriate to
the base material to be made.
The terms given in Table 7 are in accordance with EN ISO 2553:2019; the reference numbers of welding
processes are respectively in accordance with ISO/TR 25901-3, ISO 857-2:2005 and EN ISO 4063:2010.
Table 1 — Mechanical properties and chemical compositions of carbon and stainless steels
Mechanical properties Chemical composition by
%
Materials Steel Tensile Yield Breaking Breaking C P S Si Mn Cr Mo Ni Ti Nb/Ta
type strength point elongation elongation
Rm RoH/Rp Along at Lo Atransv at
0,2 = 5 do Lo = 5 do
2 2
N/mm N/mm % %
carbon ≤ 520 a ≥ 20 — ≤ ≤0,05 ≤0,05 — — — — — — —
≤ 0,7
0,25
Pipes,
sheets ferritic ≤ 600 ≥ 250 ≥ 20 ≥ 15 ≤ ≤0,045 ≤0,030 ≤ 1,0 ≤1,0 15,5 ≤1,5 — ≤ 7 ≤ 12 ×
0,08 to × %C
18 %C
austenitic ≤ 800 ≥ 180 ≥ 30 ≥ 30 ≤ ≤0,045 ≤0,030 ≤ 1,0 ≤2,0 16,5 2,0 9 ≤ 5 ≤ 8 × %C
0,08 to to to ×
20 3,0 15 %C
a
Ratio yield point–tensile strength.
An adequate high temperature yield point for the highest possible temperature of the steel shall be guaranteed.
prEN 16905-2:2021 (E)
Table 2 — Minimum requirements for cast iron
Flake graphite cast iron (EN 1561:2011):
– Tensile strength R ≥ 150 N/mm
m
– Brinell hardness 160 HB to 220 HB 2,5/187,5
Spheroidal graphite cast iron (annealed ferritic):
– Tensile strength R ≥ 400 N/mm
m
– Notch impact strength ≥ 23 J/cm
Table 3 — Parts in aluminium and aluminium alloys
Tensile strength Temperature
range
R
m
N/mm °C
Al 99,5 ≥ 75 up to 300
Al Mg2 Mn 0,8 ≥ 275 up to 250
Table 4 Parts in copper or copper alloys
Tensile strength Temperature
R
range
m
N/mm °C
SF – Cu ≥ 200 up to 250
Cu Ni 30 Fe ≥ 310 up to 350
Table 5 — Minimum thicknesses for rolled parts
Carbon steels; aluminium Protected steel
...
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