Refrigerating systems and heat pumps - Safety and environmental requirements - Part 3: Installation site and personal protectionn

This European Standard specifies the requirements for the safety of persons and property, provides guidance for the protection of the environment and establishes procedures for the operation, maintenance and repair of refrigerating systems and the recovery of refrigerants.
The term "refrigerating system" used in this European Standard includes heat pumps.  
This standard applies:
a)   to refrigerating systems, stationary or mobile, of all sizes except to road vehicle air conditioners covered by specific product standards such as ISO 13043 and SAE J 639.
b)   to secondary cooling or heating systems;
c)   to the location of the refrigerating systems; and
d)   to parts replaced and components added after adoption of this standard if they are not identical in function and capacity.
Systems using refrigerants other than those listed in Annex E of EN 378-1 (or ISO/FDIS 817): 2013 are not covered by this standard.
This standard does not apply to goods in storage, with respect to spoilage or contamination.
This standard is not applicable to refrigerating systems and heat pumps which were manufactured before the date of its publication as a European Standard except for extensions and modifications to the system which were implemented after publication.  
This standard is applicable to new refrigerating systems, extensions or modifications of already existing systems, and for existing stationary systems, being transferred to and operated on another site. Deviations are permissible only if equivalent protection is ensured.
This standard also applies in the case of the conversion of a system for another refrigerant type, in which case conformity with the relevant clauses of parts 1 to 4 of the standard shall be assessed.  
This Part 3 of the European Standard is applicable to the installation site (plant space and services). It specifies requirements on the site for safety, which may be needed because of, but not directly connected with, the refrigerating system and its ancillary components.

Kälteanlagen und Wärmepumpen - Sicherheitstechnische und umweltrelevante Anforderungen - Teil 3: Aufstellungsort und Schutz von Personen

Diese Europäische Norm legt die Anforderungen an die Sicherheit von Personen und Eigentum fest, liefert eine Anleitung in Hinblick auf den Schutz der Umwelt und enthält Vorgehensweisen für Betrieb, Instandhaltung und Instandsetzung von Kälteanlagen und die Rückgewinnung von Kältemitteln.
Die in dieser Europäischen Norm verwendete Benennung „Kälteanlage“ schließt Wärmepumpen mit ein.
Diese Norm gilt für:
a)   stationäre und ortsveränderliche Kälteanlagen aller Größen mit Ausnahme von Klimaanlagen für Straßenfahrzeuge nach den spezifischen Produktnormen wie z. B. ISO 13043 und SAE J 639;
b)   indirekte Kühl- oder Heizsysteme;
c)   den Aufstellungsort dieser Kälteanlagen; und
d)   nach der Annahme dieser Norm ersetzte Teile und hinzugefügte Bauteile, sofern sie nicht in Funktion und Leistung identisch sind.
Anlagen mit anderen als den in EN 378 1, Anhang E, (bzw. ISO/FDIS 817:2013) aufgeführten Kältemitteln sind nicht Gegenstand dieser Norm.
Die vorliegende Norm gilt in Bezug auf Verschmutzung bzw. Verunreinigung nicht für eingelagerte Güter.
Diese Norm gilt nicht für Kälteanlagen und Wärmepumpen, die vor dem Datum ihrer Veröffentlichung als Europäische Norm hergestellt wurden, ausgenommen sind im Anschluss an die Veröffentlichung erfolgte Erweiterungen und Modifizierungen an der Anlage.
Die vorliegende Norm gilt für neue Kälteanlagen, Erweiterungen oder Modifizierungen bereits bestehender Anlagen sowie bestehende stationäre Anlagen, die an einen anderen Standort verbracht und dort betrieben werden. Abweichungen sind nur zulässig, wenn ein gleichwertiger Schutz sichergestellt ist.
Diese Norm gilt auch im Falle der Umstellung einer Anlage auf eine andere Art des Kältemittels; in diesem Fall ist die Konformität mit den zutreffenden Abschnitten der Teile 1 bis 4 der Norm zu beurteilen.
Dieser Teil 3 der Europäischen Norm gilt für den Aufstellungsort (Aufstellungsraum und Versorgungs-einrichtungen). Sie legt die Anforderungen fest, die aufgrund der Kälteanlage und von deren Bauteilen für die Sicherheit vor Ort erforderlich sein können, die jedoch nicht in unmittelbarem Zusammenhang mit der Kälteanlage und deren Bauteilen stehen.

Systèmes frigorifiques et pompes à chaleur - Exigences de sécurité et d'environnement - Partie 3: Installation in situ et protection des personnes

La présente Norme européenne spécifie les exigences relatives à la sécurité des personnes et des biens, fournit des recommandations pour la protection de l'environnement et établit des modes opératoires pour le fonctionnement, la maintenance et la réparation des systèmes frigorifiques et la récupération des fluides frigorigènes.
Le terme « système frigorifique » utilisé dans la présente Norme européenne inclut les pompes à chaleur.
La présente norme s'applique :
a)   aux systèmes frigorifiques, fixes ou mobiles, de toutes tailles, excepté les climatiseurs pour véhicules routiers couverts par des normes de produit spécifiques telles que l'ISO 13043 et la SAE J 639 ;
b)   aux systèmes secondaires de refroidissement ou de chauffage ;
c)   à l'emplacement des systèmes frigorifiques ; et
d)   aux pièces remplacées et composants ajoutés après l'adoption de la présente norme, si leur fonction ou leur capacité n'est pas identique.
Les systèmes utilisant des fluides frigorigènes autres que ceux mentionnés en Annexe E de l'EN 378-1 (ou dans l'ISO/FDIS 817:2013) ne sont pas couverts par la présente norme.
La présente norme ne s'applique pas aux marchandises en stock pour ce qui concerne les détériorations ou la contamination.
La présente norme n'est pas applicable aux systèmes frigorifiques et pompes à chaleur fabriqués avant sa date de publication en tant que Norme européenne, à l'exception des extensions et modifications du système mises en œuvre après la publication.
La présente norme s'applique aux systèmes frigorifiques neufs, aux extensions ou modifications de systèmes existants et, pour les systèmes fixes existants, aux systèmes transférés et exploités sur un autre site. Les écarts ne sont admissibles que si une protection équivalente est assurée.
La présente norme s'applique également en cas de transformation d'un système pour un autre type de fluide frigorigène, auquel cas la conformité aux articles applicables des parties 1 à 4 de la norme doit être évaluée.
La présente Partie 3 de la Norme européenne est applicable à l'installation in situ (conception de l'implantation de l'usine et des services). Elle spécifie les exigences concernant le site pour des besoins de sécurité, qui peuvent être nécessaires en raison du système frigorifique et de ses équipements auxiliaires, mais sans qu'il y ait de lien direct avec ceux-ci.

Hladilni sistemi in toplotne črpalke - Varnostnotehnične in okoljevarstvene zahteve - 3. del: Mesto postavitve in zaščita oseb

Ta evropski standard določa zahteve za varnost oseb in premoženja, določa smernice za varstvo okolja ter določa postopke za delovanje, vzdrževanje in popravilo hladilnih sistemov ter izpraznitev hladilnih sredstev.
Pojem »hladilni sistem« v tem evropskem standardu zajema tudi toplotne črpalke.  
Ta standard se uporablja za:
a) hladilne sisteme, nepremične ali premične, vseh velikosti, razen klimatskih naprav cestnih vozil, ki jih zajemajo posebni standardi za proizvode, kot sta ISO 13043 in SAE J 639;
b) sekundarne hladilne ali ogrevalne sisteme;
c) mesto postavitve teh hladilnih sistemov; in
d) dele in komponente, ki so bili zamenjani in dodani po sprejetju tega standarda, če nimajo enake funkcije in zmogljivosti.
Sistemi, ki uporabljajo hladilna sredstva, ki niso navedena v dodatku E standarda EN 378-1 (ali ISO/FDIS 817): 2013, niso zajeti v tem standardu.
Ta standard se ne uporablja za skladiščeno blago v povezavi s kvarjenjem ali kontaminacijo.
Ta standard se ne uporablja za hladilne sisteme in toplotne črpalke, ki so bile izdelane pred datumom objave standarda kot evropskega standarda, razen za razširitve in spremembe sistema, ki so bile uvedene po objavi.  
Ta standard se uporablja za nove hladilne sisteme, razširitve ali spremembe že obstoječih sistemov in za obstoječe stacionarne sisteme, ki se prenesejo in upravljajo na drugem mestu postavitve. Odstopanja so dovoljena samo, če je zagotovljena enakovredna zaščita.
Ta standard se uporablja tudi v primeru predelave sistema za drugo vrsto hladilnega sredstva, pri čemer je treba oceniti skladnost z ustreznimi točkami delov 1–4 tega standarda.  
Ta tretji del tega evropskega standarda se uporablja za mesto postavitve (prostor naprave in storitve). Določa varnostne zahteve na mestu postavitve, ki so morda potrebne zaradi hladilnega sistema in njegovih pomožnih sestavnih delov, vendar niso neposredno povezane z njimi.

General Information

Status
Withdrawn
Public Enquiry End Date
14-Apr-2014
Publication Date
11-Dec-2016
Withdrawal Date
04-Nov-2020
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
05-Nov-2020
Due Date
28-Nov-2020
Completion Date
05-Nov-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kälteanlagen und Wärmepumpen - Sicherheitstechnische und umweltrelevante Anforderungen - Teil 3: Aufstellungsort und Schutz von PersonenSystèmes frigorifiques et pompes à chaleur - Exigences de sécurité et d'environnement - Partie 3: Installation in situ et protection des personnesRefrigerating systems and heat pumps - Safety and environmental requirements - Part 3: Installation site and personal protectionn27.200Hladilna tehnologijaRefrigerating technology27.080Heat pumpsICS:Ta slovenski standard je istoveten z:EN 378-3:2016SIST EN 378-3:2017en,fr,de01-februar-2017SIST EN 378-3:2017SLOVENSKI

STANDARDSIST EN 378-3:2008+A1:20121DGRPHãþD
SIST EN 378-3:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 378-3
November
t r s x ICS
t yä r z râ
t yä t r r Supersedes EN
u y zæ uã t r r z ªA sã t r s tEnglish Version

Refrigerating systems and heat pumps æ Safety and environmental requirements æ Part

uã Installation site and personal protection Systèmes frigorifiques et pompes à chaleur æ Exigences de sécurité et d 5environnement æ Partie

uã Installation in situ et protection des personnes

Kälteanlagen und Wärmepumpen æ Sicherheitstechnische und umweltrelevante Anforderungen æ Teil

uã Aufstellungsort und Schutz von Personen This European Standard was approved by CEN on

u September
t r s xä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

u y zæ uã t r s x ESIST EN 378-3:2017

EN 378-3:2016 (E) 2 Contents Page European foreword ....................................................................................................................................................... 5 Introduction .................................................................................................................................................................... 6 1 Scope .................................................................................................................................................................... 7 2 Normative references .................................................................................................................................... 7 3 Terms, definitions and abbreviated terms ............................................................................................ 8 4 Location of refrigerating equipment ........................................................................................................ 8 4.1 General ................................................................................................................................................................ 8 4.2 Refrigerating equipment located in the open air ................................................................................ 8 4.3 Refrigerating equipment located in a machinery room .................................................................... 9 4.4 Refrigerating equipment located in the occupied space .................................................................. 9 4.5 Refrigerating equipment located in an unoccupied space not designated a machinery room .............................................................................................................................................. 9 4.6 Refrigerating equipment located in a ventilated enclosure within an occupied space ...... 10 4.7 Piping duct or shaft ..................................................................................................................................... 10 5 Machinery rooms ......................................................................................................................................... 10 5.1 Access to machinery rooms ...................................................................................................................... 10 5.2 Venting from or through the machinery room .................................................................................. 10 5.3 Combustion equipment and air compressors.................................................................................... 10 5.4 Open flame ...................................................................................................................................................... 10 5.5 Storage ............................................................................................................................................................. 10 5.6 Remote emergency switch ........................................................................................................................ 11 5.7 Exterior openings of the machinery room .......................................................................................... 11 5.8 Piping and ducting ....................................................................................................................................... 11 5.9 Normal lighting ............................................................................................................................................. 11 5.10 Emergency lighting ...................................................................................................................................... 11 5.11 Dimensions and accessibility ................................................................................................................... 11 5.12 Doors, walls and ducts ................................................................................................................................ 12 5.12.1 Doors and openings ..................................................................................................................................... 12 5.12.2 Emergency ...................................................................................................................................................... 12 5.12.3 Walls, floor and ceiling ............................................................................................................................... 12 5.12.4 Service ducts .................................................................................................................................................. 12 5.12.5 Ventilation ducts .......................................................................................................................................... 12 5.13 Ventilation ...................................................................................................................................................... 12 5.13.1 General ............................................................................................................................................................. 12 5.13.2 Ventilation for normal operating conditions or when machinery room is occupied .......... 13 5.13.3 Emergency mechanical ventilation ....................................................................................................... 13 5.13.4 Required airflow for emergency mechanical ventilation .............................................................. 13 5.13.5 Mechanical ventilation openings ............................................................................................................ 13 5.14 Machinery rooms for groups A2L, A2, A3, B2L, B2 and B3 refrigerants ................................... 13 5.14.1 General ............................................................................................................................................................. 13 5.14.2 Location ........................................................................................................................................................... 13 5.14.3 Additional requirements for R-717 ....................................................................................................... 14 5.14.4 Maximum surface temperature .............................................................................................................. 15 5.14.5 Doors and openings ..................................................................................................................................... 15 SIST EN 378-3:2017

EN 378-3:2016 (E) 3 6 Requirements for alternative provisions ............................................................................................ 15 6.1 General ............................................................................................................................................................. 15 6.2 Occupied space .............................................................................................................................................. 15 6.3 Ventilation ....................................................................................................................................................... 15 6.3.1 General ............................................................................................................................................................. 15 6.3.2 Dilution transfer openings (air transfer openings for dilution) for natural convection ....................................................................................................................................................... 15 6.3.3 Mechanical ventilation ............................................................................................................................... 16 6.4 Safety shut off valves ................................................................................................................................... 17 6.4.1 General ............................................................................................................................................................. 17 6.4.2 Location ............................................................................................................................................................ 17 6.4.3 Design ............................................................................................................................................................... 17 7 Electrical installations ................................................................................................................................ 17 7.1 General requirements ................................................................................................................................. 17 7.2 Main power supply ....................................................................................................................................... 18 7.3 Electrical equipment in machinery rooms with refrigerating systems containing flammable refrigerants .............................................................................................................................. 18 8 Safety alarms .................................................................................................................................................. 18 8.1 General ............................................................................................................................................................. 18 8.2 Alarm system power .................................................................................................................................... 18 8.3 Alarm system warning ................................................................................................................................ 18 8.4 Additional alarm system requirements for R-717 systems with charges above 3 000 kg ............................................................................................................................................................ 18 9 Detectors .......................................................................................................................................................... 19 9.1 General ............................................................................................................................................................. 19 9.2 Location of detectors ................................................................................................................................... 19 9.3 Type and performance of detectors ....................................................................................................... 19 9.3.1 General ............................................................................................................................................................. 19 9.3.2 Refrigerant detectors for A2, A2L, B2L (except for R-717), B2, A3 and B3 refrigerants .... 19 9.3.3 R-717 detectors ............................................................................................................................................. 20 9.4 Installation ...................................................................................................................................................... 20 10 Instruction manuals, notices and inspections.................................................................................... 20 10.1 Instruction manual....................................................................................................................................... 20 10.2 Warning notice .............................................................................................................................................. 21 10.3 Visual inspection of the site ...................................................................................................................... 21 10.4 Maintenance of the site ............................................................................................................................... 21 11 Heat sources and temporary high temperatures at the site ......................................................... 21 Anhang A (informative)

Personal protective equipment ............................................................................ 23 A.1 General requirements ................................................................................................................................. 23 A.1.1 Type of protective equipment .................................................................................................................. 23 A.1.2 Accessibility .................................................................................................................................................... 23 A.1.3 Location ............................................................................................................................................................ 23 A.1.4 Check and maintenance ............................................................................................................................. 23 A.1.5 Temperature .................................................................................................................................................. 23 A.1.6 Respirators...................................................................................................................................................... 23 A.2 Normal use ...................................................................................................................................................... 24 SIST EN 378-3:2017

EN 378-3:2016 (E) 4 A.3 Emergency use .............................................................................................................................................. 24 A.3.1 General ............................................................................................................................................................. 24 A.3.2 Respiratory protective devices ............................................................................................................... 24 A.3.3 First aid equipment ..................................................................................................................................... 24 Bibliography ................................................................................................................................................................. 25

SIST EN 378-3:2017

EN 378-3:2016 (E) 5 European foreword This document (EN 378-3:2016) has been prepared by Technical Committee CEN/TC 182 “Refrigerating systems, safety and environmental requirements”, the secretariat of which is held by DIN. 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 May 2017, and conflicting national standards shall be withdrawn at the latest by May 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 378-3:2008+A1:2012. EN 378 consists of the following parts under the general title “Refrigerating systems and heat pumps — Safety and environmental requirements”: — Part 1: Basic requirements, definitions, classification and selection criteria; — Part 2: Design, construction, testing, marking and documentation; — Part 3: Installation site and personal protection; — Part 4: Operation, maintenance, repair and recovery. The main changes in part 3 with respect to the previous edition are listed below: — harmonisation as far as possible with ISO 5149:2014 and ISO 817:2014; — clarification of when to use of 'special machinery room', and modify to “separate refrigeration machinery room”; — consideration of requirements for 2L refrigerants; — inclusion of Clause 6 additional measures to support EN 378-1:2016, C.3; — modification of requirements for sprinkler systems. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 378-3:2017

EN 378-3:2016 (E) 6 Introduction The introduction of EN 378-1 is applicable. SIST EN 378-3:2017

EN 378-3:2016 (E) 7 1 Scope This European Standard specifies the requirements for the safety of persons and property, provides guidance for the protection of the environment and establishes procedures for the operation, maintenance and repair of refrigerating systems and the recovery of refrigerants. The term “refrigerating system” used in this European Standard includes heat pumps. This Part 3 of the European Standard is applicable to the installation site (plant space and services). It specifies requirements on the site for safety, which may be needed because of, but not directly connected with, the refrigerating system and its ancillary components. This standard applies: a) to refrigerating systems, stationary or mobile, of all sizes except to vehicle air conditioning systems covered by a specific product standard e.g. ISO 13043; b) to secondary cooling or heating systems; c) to the location of the refrigerating systems; d) to replaced parts and added components after adoption of this standard if they are not identical in function and in the capacity. Systems using refrigerants other than those listed in of EN 378-1:2016, Annex E are not covered by this standard. This standard does not apply to goods in storage. This standard is not applicable to refrigerating systems which were manufactured before the date of its publication as a European Standard except for extensions and modifications to the system which were implemented after publication. This standard is applicable to new refrigerating systems, extensions or modifications of already existing systems, and for existing stationary systems, being transferred to and operated on another site. This standard also applies in the case of the conversion of a system for another refrigerant type, in which case conformity with the relevant clauses of parts 1 to 4 of the standard shall be assessed. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 378-1:2016, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 1: Basic requirements, definitions, classification and selection criteria EN 378-2:2016, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 2: Design, construction, testing, marking and documentation EN 1363 (all parts), Fire resistance tests EN 1364 (all parts), Fire resistance tests for non-load bearing elements EN 1365 (all parts), Fire resistance tests for load bearing elements EN 1366-1, Fire resistance tests for service installations — Part 1: Ventilation ducts SIST EN 378-3:2017

EN 378-3:2016 (E) 8 EN 1366-2, Fire resistance tests for service installations — Part 2: Fire dampers EN 1507, Ventilation for buildings — Sheet metal air ducts with rectangular section — Requirements for strength and leakage EN 1634 (all parts), Fire resistance and smoke control tests for door and shutter assemblies, openable windows and elements of building hardware EN 12236, Ventilation for buildings — Ductwork hangers and supports — Requirements for strength EN 12845, Fixed firefighting systems — Automatic sprinkler systems — Design, installation and maintenance EN 14624, Performance of portable leak detectors and of room monitors for halogenated refrigerants EN 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres (IEC 60079-10-1) EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005) EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529) EN ISO 13850, Safety of machinery — Emergency stop function — Principles for design (ISO 13850) EN ISO 14122-2, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms and walkways (ISO 14122-2) ISO 13043, Road vehicles — Refrigerant systems used in mobile air conditioning systems (MAC) — Safety requirements ISO 817, Refrigerants — Designation and safety classification IEC 60364, Low-voltage electrical installations 3 Terms, definitions and abbreviated terms For the purposes of this document, the terms, definitions and abbreviated terms given in EN 378-1:2016 apply. 4 Location of refrigerating equipment 4.1 General Refrigerating equipment may be sited outside the building in the open air or in a machinery room or in occupied areas or in unoccupied areas not designated as a machinery room. NOTE The refrigerating equipment can be contained in a ventilated enclosure provided by the manufacturer. Requirements for this enclosure are given in EN 378–2:2016, 6.2.15. 4.2 Refrigerating equipment located in the open air Refrigerating systems sited in the open air shall be positioned to avoid leaked refrigerant flowing into a building or otherwise endangering people and property. The refrigerant shall not be able to flow into any ventilation fresh air opening, doorway, trap door or similar opening in the event of a leak. Where a SIST EN 378-3:2017

EN 378-3:2016 (E) 9 shelter is provided for refrigerating equipment sited in the open air it shall have natural or forced ventilation. A room, where at least one of the longer walls is open to the outside air by means of louvres with 75 % free area and covering at least 80 % of the wall area (or the equivalent if more than one wall is to outside), is considered as being in the open air. For refrigeration systems installed outside in a location where a release of refrigerant can stagnate e.g. below ground, then the installation shall comply with the requirements for gas detection and ventilation of machinery rooms (see 5.13, Clauses 8 and 9). For refrigerants of class 2L, 2 and 3 requirements regarding ignition sources in EN 378-2:2016, 6.2.14 shall apply where appropriate. 4.3 Refrigerating equipment located in a machinery room When a machinery room is chosen for the location of the refrigerating equipment it shall meet the requirements specified in 5.1 to 5.14. A risk analysis based on the safety concept for the refrigerating system (as determined by the manufacturer and including the charge and safety classification of the refrigerant used) shall be conducted to determine whether it is necessary to place the refrigerating system in a separate refrigeration machinery room. NOTE 1 National regulations may set specific requirements for the use of separate refrigeration machinery rooms. For systems below ground using class 3 flammable refrigerants with a charge greater than ‘m2’, an additional gas detector and audible/visual alarm shall be used and shall meet the requirements for detectors in this standard. NOTE 2 Additional requirements may be needed for refrigerating systems containing B2L, B2, B3, A2L, A2, and A3 refrigerants as specified in 5.14. NOTE 3 A housing which is sufficiently large for people to enter is a machinery room. 4.4 Refrigerating equipment located in the occupied space The requirements shall be as specified in EN 378-1. 4.5 Refrigerating equipment located in an unoccupied space not designated a machinery room Where compressors or pressure vessels are located in an unoccupied space which is sealed from any occupied space the location shall be treated as a machinery room in accordance with Clause 5. Where equipment (not including compressors and pressure vessels) containing non-permanent joints is located in an unoccupied space which is sealed from any occupied space the requirements of Clause 5 shall be applied, but if mechanical ventilation is required according to 5.13, ventilation shall be from an extractor hood positioned adjacent to the equipment and the ventilation rate shall be more than 0,05 m3/s per ventilator. In the case of equipment subject to adverse conditions, for example severe vibration or a corrosive atmosphere, the ventilation rate shall be more than 0,5 m3/s per extractor hood. If mechanical ventilation is required, refrigerant detectors shall activate the ventilation at 50 % of the ATEL, except for refrigerants with a characteristic odour at concentrations below ATEL/ODL (such as R-717), or 25 % of the LFL, whichever is lower. NOTE 1 Severe vibration could be caused by unbalanced dynamic loads or hydraulic shock during defrost operation. NOTE 2 The ventilation rate is deemed sufficient to ventilate a volume of 18 m3. SIST EN 378-3:2017

EN 378-3:2016 (E) 10 For any equipment, if the space cannot be sealed from any occupied space then the refrigerating equipment shall be considered as located in the occupied space and the requirements for such spaces shall apply. 4.6 Refrigerating equipment located in a ventilated enclosure within an occupied space The ventilated enclosure containing the refrigerating system shall have a ventilation duct as specified by the manufacturer. The duct shall be as specified by the manufacturer see EN 378-2. The room into which the ventilated enclosure is installed shall be at least ten times the volume of the enclosure and shall have sufficient make up air to replace any exhausted air. The ventilation from the enclosure shall be to open air. 4.7 Piping duct or shaft Where hand operated shut-off devices are mounted in a piping duct or shaft designed for human entry, the duct or shaft shall have more than one escape exit. The duct shall have a height of at least 1,2 m. 5 Machinery rooms 5.1 Access to machinery rooms Machinery rooms should not be used as occupied spaces. The operator shall ensure that access is permitted only by instructed personnel doing the necessary maintenance to the machinery room or general plant. If machinery rooms are occupied for significant periods, e.g. used as a building maintenance workspace, they shall be considered as occupied spaces under access category c, authorised access, given in EN 378-1. A separate refrigeration machinery room shall not be used as an occupied space. 5.2 Venting from or through the machinery room Refrigerant shall be prevented from entering neighbouring rooms, staircases, courts, gangways or building draining systems and the escaping gas shall be vented outdoors. There shall be no airflow to an occupied space through a machinery room unles

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