EN 16905-2:2020
(Main)Gas-fired endothermic engine driven heat pumps - Part 2: Safety
Gas-fired endothermic engine driven heat pumps - Part 2: Safety
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, prEN 16905-4:2022;
d) the calculation of seasonal performances in heating and cooling mode, FprEN 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 60204-1:2018.
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:
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.
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.
Gasbefeuerte endothermische Motor-Wärmepumpen - Teil 2: Sicherheit
1.1 Anwendungsbereich von EN 16905
Diese Europäische Norm legt die Anforderungen, Prüfverfahren und Prüfbedingungen für die Bewertung und Leistungsberechnung von Luftkonditionierern und Wärmepumpen mit gasbefeuerten endothermischen motorgetriebenen Verdichtern fest, die entweder Luft, Wasser oder Sole als Wärmeübertragungsmedium verwenden und zur Heizung, Kühlung und Kältetechnik dienen, nachfolgend als „GEHP-System“ bezeichnet.
Diese Europäische Norm gilt ausschließlich für GEHP-Systeme mit einer maximalen Wärmebelastung von 70 kW (bezogen auf den Heizwert [NCV; en: net calorific value]) bei Norm-Nennbedingungen.
Diese Norm 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 437:2018.
Diese Norm gilt ausschließlich für GEHP-Systeme mit:
a) endothermischen Gasmotoren, die durch vollständig automatisierte Regelungen gesteuert werden;
b) geschlossenen Kühlkreislaufsystemen, in denen das Kühlmittel nicht direkt mit der zu kühlenden oder zu erwärmenden Flüssigkeit in Berührung kommt;
c) einer Temperatur des Wärmeübertragungsmediums im Heizsystem (Heizungswasserkreislauf), die im Normalbetrieb 105 °C nicht überschreitet;
d) einem höchsten Betriebsdruck im
1) Heizungswasserkreislauf (falls installiert), der 6 bar nicht überschreitet;
2) Warmwasserbereitungskreislauf für Nutzwasser (falls installiert), der 10 bar nicht überschreitet.
Diese Europäische Norm gilt ausschließlich für GEHP-Systeme, die zur Raumbeheizung oder -kühlung oder zur Kälteerzeugung mit oder ohne Wärmerückgewinnung angewendet werden.
In dieser Europäischen Norm werden keine GEHP-Systeme behandelt, deren Kondensator mit Luft oder durch Verdampfung von zusätzlichem Wasser auf der Außenseite gekühlt wird.
In dieser Europäischen Norm werden Verpackungseinheiten, Single-Split- und Multi-Split-Systeme behandelt. Auch Einkanal- und Zweikanal-Einheiten werden in der vorliegenden Europäischen Norm behandelt.
Die vorstehend aufgeführten GEHP-Systeme können eine oder mehrere Primär oder Sekundärfunktion(en) haben.
Diese Europäische Norm gilt für GEHP-Systeme, die einer Typprüfung zu unterziehen sind. Anforderungen an nicht typgeprüfte GEHP-Systeme wären ein Thema für weitere Überlegungen.
Bei (aus mehreren Teilen bestehenden) Verpackungseinheiten gilt die vorliegende Norm nur, wenn diese Einheiten als vollständige Baugruppe ausgelegt und geliefert werden.
ANMERKUNG Sämtliche in diesem Text angegebenen Symbole werden unabhängig von der jeweilig verwendeten Sprache angewendet.
1.2 Anwendungsbereich von EN 16905 2
Dieser Teil der Normenreihe EN 16905 legt die Sicherheitsanforderungen, die Sicherheitsprüfbedingungen und die Sicherheitsprüfverfahren von gasbefeuerten endothermischen Motor-Wärmepumpen für den Heiz- und/oder Kühlmodus einschließlich der Wärmerückgewinnung des Motors fest.
Pompes à chaleur à moteur endothermique alimenté au gaz - Partie 2: Sécurité
1.1 Domaine d'application de la série prEN 16905
La présente Norme européenne spécifie les exigences, les méthodes d'essai et les conditions d'essai applicables aux calculs des caractéristiques et des performances des climatiseurs et pompes à chaleur utilisant de l'air, de l'eau ou de l'eau glycolée comme fluide caloporteur, munis de compresseurs à moteur endothermique alimenté au gaz, et destinés à des applications de chauffage, de refroidissement et de réfrigération de locaux (ci-après désignés par l'appellation « appareils GEHP »).
La présente Norme européenne s'applique uniquement aux appareils GEHP dont le débit calorifique maximal (dérivé du pouvoir calorifique inférieur) ne dépasse pas 70 kW dans les conditions nominales de performance.
Elle se limite également aux appareils GEHP classés dans les 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 437:2003+A1:2009.
La présente norme ne s'applique qu'aux appareils GEHP :
a) équipés de moteurs endothermiques alimentés au gaz régulés par des systèmes de régulation entièrement automatisés ;
b) comportant 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) ; et
2) ne dépasse pas 10 bar dans le circuit d'eau chaude sanitaire (le cas échéant).
La présente Norme européenne s'applique aux appareils GEHP utilisés uniquement pour le chauffage de locaux, le refroidissement de locaux ou la réfrigération, avec ou sans récupération de chaleur.
La présente Norme européenne ne couvre pas les appareils GEHP dont le condenseur est refroidi par air et par évaporation de l'eau d'un circuit supplémentaire externe.
La présente Norme européenne couvre les systèmes autonomes, mono-split et multi-split. Les installations à simple conduit et à double conduit entrent également dans son domaine d'application.
Les appareils GEHP ci-dessus peuvent assurer une ou plusieurs fonctions principales ou secondaires.
La présente Norme européenne s'applique aux appareils GEHP destinés à être soumis à des essais de type. Les exigences relatives aux appareils GEHP non soumis à des essais de type pourraient être assujetties à des considérations supplémentaires.
Dans le cas des appareils autonomes (constitués de plusieurs éléments), la norme ne s'applique qu'aux appareils conçus et fournis sous forme d'ensemble complet.
NOTE Tous les symboles spécifiés dans le présent document sont utilisés quelle que soit la langue utilisée.
1.2 Domaine d'application de la norme prEN 16905-2
La présente partie de la norme prEN 16905 spécifie les exigences de sécurité, les conditions d'essai de sécurité et les méthodes d'essai de sécurité applicables aux pompes à chaleur à moteur endothermique alimenté au gaz utilisées en mode chauffage et/ou refroidissement, y compris la récupération de chaleur du moteur.
Toplotna črpalka s plinsko gnanim motorjem z notranjim zgorevanjem - 2. del: Varnost
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2020
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: EN 16905-2:2020
ICS:
27.080 Toplotne črpalke Heat pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 16905-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 27.080
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 European Standard was approved by CEN on 4 November 2019.
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, Turkey 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16905-2:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 5
1.1 Scope of EN 16905 . 5
1.2 Scope of EN 16905-2 . 5
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 8
4.1 General . 8
4.2 Classification of GEHP appliances . 8
4.3 GEHP appliance classification according to the maximum water side operating
pressure (PMS): . 8
5 Design requirements . 9
5.1 Structure . 9
5.2 Material . 12
5.3 EMC / electrical requirements . 19
6 Operational requirements . 20
6.1 General requirements . 20
6.2 Soundness . 20
6.3 Heat input at standard rating conditions . 21
6.4 Limit temperatures . 21
6.5 Limit operating conditions . 22
6.6 Insulation resistance . 22
6.7 Transient overvoltage . 22
6.8 Withstand voltage . 23
6.9 Waterproof performance . 23
6.10 Sound power level . 23
6.11 Engine perform . 23
6.12 Power failure . 25
6.13 Abnormalities . 25
6.14 Starting current . 25
7 Test methods . 25
7.1 General test conditions . 25
7.2 Soundness . 27
7.3 Heat input at standard rating conditions . 29
7.4 Limit temperatures . 29
7.5 Limit operating conditions . 30
7.6 Insulation resistance test . 31
7.7 Transient overvoltage test . 31
7.8 Withstand voltage test . 31
7.9 Waterproof performance test . 31
7.10 Sound power level test . 32
7.11 Engine performance . 32
7.12 Power failure test . 33
7.13 Abnormalities test . 33
7.14 Starting current test . 33
8 Risk assessment . 33
9 Marking and instructions . 34
9.1 GEHP appliance marking . 34
9.2 Installation instructions . 36
9.3 User’s instructions. 38
9.4 Gas convertion instructions . 38
9.5 Presentation . 39
Annex A (informative) Calculation of conversion of NO . 40
x
Annex B (normative) Engine startup test method . 41
B.1 General . 41
B.2 Test condition . 41
B.3 Test method . 41
Annex C (normative) CO concentration test method . 42
C.1 General . 42
C.2 Test condition . 42
Annex D (normative) NO concentration test method . 45
x
D.1 Definitions . 45
D.2 General . 45
Annex E (normative) Power failure test method. 48
E.1 General . 48
E.2 Test method . 48
Annex F (informative) Examples for marking . 49
F.1 Data-plate (see 9.1.1) . 49
F.2 Additional data-plate (see 9.1.2). 49
Annex G (informative) Examples for NO calculation . 50
x
G.1 E calculation . 50
rpm equivalvent
G.2 NO ppm to mg/kWh conversation . 50
x
G.3 Temperature and humidity correction formula calculation . 50
Bibliography . 51
European foreword
This document (EN 16905-2:2020) 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 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 July 2020 and conflicting national standards shall be
withdrawn at the latest by July 2020.
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 mandate given to CEN by the European Commission and the
European Free Trade Association.
This standard 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.
These documents will be reviewed whenever new mandates could apply.
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, Turkey and the
United Kingdom.
1 Scope
1.1 Scope of EN 16905
This European Standard specifies the requirements, test methods and test conditions 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".
This European Standard only applies to GEHP appliances with a maximum heat input (based on net
calorific value) not exceeding 70 kW at standard rating conditions.
This standard only applies to GEHP appliances under categories I , I , I , I , I , I , I ,
2H 2E 2Er 2R 2E(S)B 2L 2LL
I , I , I , I , I , I , I II +, II +, II , II , II ,
2ELL 2E(R)B 2ESi 2E(R) 3P 3B 3B/P, 2H3 2Er3 2H3B/P 2L3B/P 2E3B/P
II , II , II , II and II according to EN 437:2018.
2ELL3B/P 2L3P 2H3P 2E3P 2Er3P
This standard only applies to GEHP appliances having:
a) gas fired endothermic engines under the control of fully automatic control systems;
b) 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 ºC 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 European Standard applies to GEHP appliances only when used for space heating or space cooling
or for refrigeration, with or without heat recovery.
The GEHP appliances having their condenser cooled by air and by the evaporation of external additional
water are not covered by this European Standard.
Packaged units, single split and multisplit systems are covered by this European Standard. Single duct
and double duct units are covered by this European Standard.
The above GEHP appliances can have one or more primary or secondary functions.
This European Standard 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.
In the case of packaged units (consisting of several parts), the standard applies only to those designed
and supplied as a complete package.
NOTE All the symbols given in this text are used regardless of the language used.
1.2 Scope of EN 16905-2
This part of EN 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.
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, Automatic shut-off valves for gas burners and gas appliances
EN 378-2, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 2:
Design, construction, testing, marking and documentation
EN 437:2018, Test gases — Test pressures — Appliance categories
EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 1561:2011, Founding — Grey cast irons
EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape
EN 10226-1, 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, 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, Corrugated safety metal hose assemblies for the connection of domestic appliances using
gaseous fuels
EN 16436-1, Rubber and plastics hoses, tubing and assemblies for use with propane and butane and their
mixture in the vapour phase — Part 1: Hoses and tubings
EN 16905-1, 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 55014-1, Electromagnetic compatibility — Requirements for household appliances, electric tools and
similar apparatus — Part 1: Emission (CISPR 14-1)
EN 55014-2, Electromagnetic compatibility — Requirements for household appliances, electric tools and
similar apparatus — Part 2: Immunity — Product family standard
EN 60335-1, Household and similar electrical appliances — Safety Part 1: General requirements (IEC
60335-1)
EN 60335-2-40:2003, Household and similar electrical appliances — Safety — Part 2-40: Particular
requirements for electrical heat pumps, air-conditioners and dehumidifiers (IEC 60335-2-40:2002)
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)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
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 61000-3-11, 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 (IEC 61000-3-11)
EN 61000-3-12, 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 (IEC 61000-3-12)
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 61000-6-3, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission standard
for residential, commercial and light-industrial environments (IEC 61000-6-3)
EN ISO 2553, Welding and allied processes — Symbolic representation on drawings — Welded joints (ISO
2553)
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)
EN ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs (ISO 7010)
ISO 857-2, Welding and allied processes — Vocabulary — Part 2: Soldering and brazing processes and
related terms
ISO/TR 25901-3, Welding and allied processes — Vocabulary — Part 3: Welding processes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16905-1 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://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"
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 437:2018. This standard is for GEHP appliances working with 2 and 3 gas family only.
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.
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 operation of safety devices shall not be overruled by adjusting and control devices.
n) 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.
o) 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.
p) Levers and other controlling and setting devices shall be clearly marked and give appropriate
instructions so as to prevent any error in operation/use. Their design shall be such as to preclude
accidental operation.
q) 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 port, normally, shall 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 or EN 10226-2
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.
d) Composition of the automatic shut-off valves shall be C+C or B+J.
e) Safety devices which require non-volatile lockout to occur shall give rise to simultaneous signal to
close the two or more valves.
Instead of J-class valves also C-class valves are possible, instead of C-class valves also B-class valves.
In response to a control device, if the delay between the signals to close the two valves is not greater
than 5 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 is released
easily to atmosphere without dangerous to the health of persons and domestic animals exposed.
e) Gas carring circuit 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.
5.1.2.4 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, vibration of an engine, etc. sufficiently.
b) The opening of combustion products exhaust outlet shall be structured so that a steel ball of 16 mm
in diameter cannot enter or birds, etc. cannot invade.
c) Condensation shall not affect the operational safety, then the combustion products circuit shall
have the structure which is capable of easily discharging condensation drain without blocking the
combustion products.
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 cannot enter or birds, etc. cannot invade and be not affected by fallen leaves.
b) The panel for checking and maintenance shall have the structure to endure the repetitive use of
attachment and detachment.
5.1.2.7 Motor for engine startup
The motor for engine startup shall have the function 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 manufacturer, 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 which the manufacturer designates, 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 which the
manufacturer designates, 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 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 General
The quality and thickness of the materials used in the construction of the GEHP appliances shall be such
that the constructional and operational characteristics are not significantly altered during a reasonable
life and under normal conditions of installation and use.
All parts of the GEHP appliance shall withstand the mechanical, chemical and thermal conditions to
which they may be subjected when the GEHP appliance is used normally.
The materials of the parts containing domestic water shall not affect the quality of the domestic water
in respect of either health or taste.
The whole of the domestic hot water circuit shall be made up of corrosion resistant materials or shall be
protected against corrosion.
Materials shall be appropriate for their use, under intended application and at the maximum water
pressure stated in the installation instruction.
5.2.2 Gas carrying circuit
The material used for the part which contains fuel gas shall be as follows:
a) The metallic material shall be anti-corrosion or of which the surface is given an anti-corrosion
treatment.
b) The rubber hose shall have quality to sufficiently endure the pressure and components of a fuel gas
and conform to the specification of EN 16436-1 or that at least equivalent thereto in the
performance.
c) The metal braided flexible hose shall be that which conforms to EN 14800 or that at least
equivalent thereto in the performance.
d) 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.
e) Rubber materials of packing and sealing used in gas carring circuit shall comply with the relevant
requirements of EN 549.
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 Vibration-proof material
The vibration-proof material which supports an engine shall be oilproof, heatproof and durable.
5.2.6 Materials and thicknesses of walls or tubes under water pressure of pressure class 3
5.2.6.1 General
The characteristics of the materials and the thicknesses of walls under pressure shall comply with the
requirements of 5.2.6.2, 5.2.6.3 and 5.2.6.4. If other materials and/or other thicknesses are used, these
shall have an equivalent level of fitness for purpose.
5.2.6.2 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.
5.2.6.3 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.
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.
5.2.6.4 Welded seams and welding fillers
Materials shall be suitable for welding. The materials given in Table 7 may be used 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 under
unfavourable manufacturing or operating conditions 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; the reference numbers of welding
processes are respectively in accordance with ISO/TR 25901-3, ISO 857-2 and EN ISO 4063.
Table 1 — Mechanical properties and chemical compositions of carbon and stainless steels
Mechanical properties Chemical composition by mass
%
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 Atransv at
0,2
Lo = 5 do Lo = 5 do
2 2
N/mm N/mm % %
carbon ≤ 520 a ≥ 20 — ≤ 0,25 ≤0,05 ≤0,05 — — — — — — —
≤ 0,7
Pipes,
sheets ferritic ≤ 600 ≥ 250 ≥ 20 ≥ 15 ≤ 0,08 ≤0,045 ≤0,030 ≤ 1,0 ≤1,0 15,5 to ≤1,5 — ≤ 7 × ≤ 12 ×
18 %C %C
austenitic ≤ 800 ≥ 180 ≥ 30 ≥ 30 ≤ 0,08 ≤0,045 ≤0,030 ≤ 1,0 ≤2,0 16,5 to 2,0 to 9 to ≤ 5 × ≤ 8 ×
20 3,0 15 %C %C
a
Ratio yield point–tensile strength.
An adequate high temperature yield point for the highest possible temperature of the steel shall be guaranteed.
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 range
R
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 steels; stainless
steels; copper
a b c a b c
a b c a b c
mm mm mm mm mm mm
4 3 2,9 2 2 1
a
Column a: for walls of combustion chambers exposed to water and fire, and for
horizontal walls of convection heating surfaces.
b
Column b: for walls exposed only to water and for rigid shapes, for example
convection heating surfaces outside the combustion chamber.
c
Column c: tubes of convection heat exchangers.
Table 6 — Nominal minimum thicknesses of GEHP appliance sections
Nominal heat input Flake graphite cast Spheroidal graphite
Q iron aluminium annealed ferritic cast
n
iron, copper
kW mm mm
≤ 35 3,5 3,0
> 35 4,0 3,5
Table 7 — Weld joints and welding processes
No. Weld joint type Material Welding Remarks
thickness a
process
t mm
1.1 Square butt weld ≤ 6 135 P er missible up to t
(8) 12 = 8 mm on use of
131 d eep penetration
(111) electrodes or
welding on both
sides
1.2 Square butt weld ≥ 6 12 Root gap b = 2 mm
up to 12 to 4 mm with
stiffener, powder
holder necessary
1.3 Square butt weld (double) > 8 135 Ro o t gap b = 2 mm
up to 12 12 to 4 mm
(111)
Deep penetration
electrodes shall be
used for manual
electro welding
1.4 Single-V butt weld up to 12 (111) Seam preparation
V-seam 60°
1.5 Single-V butt weld up to 12 135 S ea m preparation
12 V-seam 30° to 50°
depending on
thickness of
material
No. Weld joint type Material Welding Remarks
thickness a
process
t mm
1.6 Double-V butt weld greater 135 S ea m preparation
than 12 12 double V-seam 30°
to 50° depending
on material
thickness
1.7 Butt weld between plates with raised edges ≤ 6 135 O nl y permissible
141 i n ex ceptional
131 c ases for parts
(111) welded in.
Moreover, the
welds have to be
kept largely free
from bending
stresses. Not
suitable for
directly fired wall
parts s = 0,8 t
1.8 Overlap welding ≥ 6 135 W e lds of this type
12 are to be kept
largely free from
bending stresses.
Not suitable for
directly fired wall
parts
s = t
1.9 Overlap welding (continued) ≤ 6 135 N ot suitable for
12 di rectly fired wall
(111) parts
s = t
2.1 Fillet weld ≤ 6 135 W e lds of this type
12 ar e to be kept
(111) largely free from
bending stresses. a
=
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