Gas-fired endothermic engine driven heat pumps - Part 2: Safety

1.1   Scope of prEN 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 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 437:2003+A1:2009.
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 prEN 16905-2
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.

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

Status
Published
Publication Date
21-Jan-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
22-Jan-2020
Completion Date
22-Jan-2020

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SLOVENSKI STANDARD
SIST EN 16905-2:2020
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
SIST EN 16905-2:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16905-2:2020
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SIST EN 16905-2:2020
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.
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SIST EN 16905-2:2020
EN 16905-2:2020 (E)
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

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SIST EN 16905-2:2020
EN 16905-2:2020 (E)

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

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

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

G.1 E calculation .................................................................................................................. 50

rpm equivalvent

G.2 NO ppm to mg/kWh conversation ........................................................................................................ 50

G.3 Temperature and humidity correction formula calculation ........................................................ 50

Bibliography ................................................................................................................................................................. 51

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SIST EN 16905-2:2020
EN 16905-2:2020 (E)
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.
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SIST EN 16905-2:2020
EN 16905-2:2020 (E)
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.
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SIST EN 16905-2:2020
EN 16905-2:2020 (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, 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)
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SIST EN 16905-2:2020
EN 16905-2:2020 (E)

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
---------------------- Page: 9 ----------------------
SIST EN 16905-2:2020
EN 16905-2:2020 (E)
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.
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SIST EN 16905-2:2020
EN 16905-2:2020 (E)
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.

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SIST EN 16905-2:2020
EN 16905-2:2020 (E)
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 outs
...

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