Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1: Basic requirements, definitions, classification and selection criteria

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 of EN 378 specifies the classification and selection criteria applicable to refrigerating systems. These classification and selection criteria are used in parts 2, 3 and 4.
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 Annex E of this European Standard are not covered by this standard.
Annex C specifies how to determine the amount of refrigerant permitted in a given space, which when exceeded, requires additional protective measures to reduce the risk.
Annex E specifies criteria for safety and environmental considerations of different refrigerants used in refrigeration and air conditioning.
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.
This standard also applies in the case of the conversion of a system to another refrigerant type, in which case conformity to the relevant clauses of parts 1 to 4 of the standard shall be assessed.
Product family standards dealing with the safety of refrigerating systems takes precedence over horizontal and generic standards covering the same subject.

Kälteanlagen und Wärmepumpen - Sicherheitstechnische und umweltrelevante Anforderungen - Teil 1: Grundlegende Anforderungen, Begriffe, Klassifikationen und Auswahlkriterien

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.
Der in dieser Europäischen Norm verwendete Begriff „Kälteanlage“ schließt Wärmepumpen mit ein.
Der vorliegende Teil der EN 378 legt die auf Kälteanlagen anwendbare(n) Klassifikation und Auswahlkriterien fest. Die Klassifikation und Auswahlkriterien werden in den Teil 2, Teil 3 und Teil 4 angewendet.
Diese Norm gilt für:
a) stationäre und ortsveränderliche Kälteanlagen aller Größen, mit Ausnahme von Klimaanlagen in Kraftfahrzeugen, die von bestimmten Produktnormen wie z. B. ISO 13043 abgedeckt werden;
b) indirekte Kühl- oder Heizsysteme;
c) den Aufstellungsort dieser Kälteanlagen;
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 Anhang E dieser Europäischen Norm aufgeführten Kältemitteln sind nicht Gegenstand dieser Norm.
Anhang C legt fest, wie die in einem gegebenen Raum zulässige Kältemittel-Füllmenge zu bestimmen ist, bei deren Überschreitung zusätzliche Schutzmaßnahmen zur Risikominderung erforderlich sind.
Anhang E legt Kriterien für sicherheits- und umweltbezogene Überlegungen in Bezug auf verschiedene bei Kühlung und Klimatisierung eingesetzte Kältemittel fest.
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 für bestehende stationäre Anlagen, die an einen anderen Standort verbracht und dort betrieben werden.
Diese Norm gilt auch im Falle der Umstellung einer Anlage auf ein anderes Kältemittel; in diesem Fall ist die Konformität mit den zutreffenden Abschnitten der Teile 1 bis 4 der Norm zu beurteilen.
Produktfamiliennormen bezüglich der Sicherheit von Kälteanlagen haben Vorrang gegenüber Sicherheitsfachgrundnormen und Sicherheitsgrundnormen desselben Anwendungsbereiches.

Systèmes frigorifiques et pompes à chaleur - Exigences de sécurité et d'environnement - Partie 1 : Exigences de base, définitions, classification et critères de choix

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 l'exploitation, 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 partie de l'EN 378 spécifie les critères de classification et de choix applicables aux systèmes frigorifiques. Ces critères sont utilisés dans les parties 2, 3 et 4.
La présente norme s'applique :
a)   aux systèmes frigorifiques, fixes ou mobiles, de toutes tailles, excepté les systèmes d'air conditionné embarqués couverts par une norme de produit spécifique telle que l'ISO 13043 ;
b)   aux systèmes secondaires de refroidissement ou de chauffage ;
c)   à l'emplacement des systèmes frigorifiques ;
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 la présente Norme européenne ne sont pas couverts par la présente norme.
L'Annexe C spécifie la méthode permettant de déterminer la quantité de fluide frigorigène admise dans un espace donné qui, lorsqu'elle est dépassée, exige des mesures de protection supplémentaires pour réduire les risques.
L'Annexe E spécifie les critères relatifs à la sécurité et aux aspects environnementaux de différents fluides frigorigènes utilisés en réfrigération et climatisation.
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.
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.
Les normes de familles de produits traitant de la sécurité des systèmes frigorifiques prennent le pas sur les normes horizontales et génériques couvrant le même sujet.

Hladilni sistemi in toplotne črpalke - Varnostnotehnične in okoljevarstvene zahteve - 1. del: Osnovne zahteve, definicije, razvrstitev in kriteriji za izbiro

General Information

Status
Published
Publication Date
08-Nov-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Nov-2020
Due Date
10-Jan-2021
Completion Date
09-Nov-2020

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SLOVENSKI STANDARD
SIST EN 378-1:2017+A1:2021
01-januar-2021
Hladilni sistemi in toplotne črpalke - Varnostnotehnične in okoljevarstvene

zahteve - 1. del: Osnovne zahteve, definicije, razvrstitev in kriteriji za izbiro

Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1:

Basic requirements, definitions, classification and selection criteria
Kälteanlagen und Wärmepumpen - Sicherheitstechnische und umweltrelevante

Anforderungen - Teil 1: Grundlegende Anforderungen, Begriffe, Klassifikationen und

Auswahlkriterien

Systèmes frigorifiques et pompes à chaleur - Exigences de sécurité et d'environnement -

Partie 1 : Exigences de base, définitions, classification et critères de choix
Ta slovenski standard je istoveten z: EN 378-1:2016+A1:2020
ICS:
01.040.27 Prenos energije in toplote Energy and heat transfer
(Slovarji) engineering (Vocabularies)
27.080 Toplotne črpalke Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
SIST EN 378-1:2017+A1:2021 en,fr,de

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

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SIST EN 378-1:2017+A1:2021
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2020
EUROPÄISCHE NORM
ICS 01.040.27; 27.080; 27.200 Supersedes EN 378-1:2016
English Version
Refrigerating systems and heat pumps - Safety and
environmental requirements - Part 1: Basic requirements,
definitions, classification and selection criteria

Systèmes frigorifiques et pompes à chaleur - Exigences Kälteanlagen und Wärmepumpen -

de sécurité et d'environnement - Partie 1 : Exigences Sicherheitstechnische und umweltrelevante

de base, définitions, classification et critères de choix Anforderungen - Teil 1: Grundlegende Anforderungen,

Begriffe, Klassifikationen und Auswahlkriterien

This European Standard was approved by CEN on 3 September 2016 and includes Amendment 1 approved by CEN on 17 August

2020.

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 378-1:2016+A1:2020 E

worldwide for CEN national Members.
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 8

3.1 Refrigerating systems .................................................................................................................................... 8

3.2 Occupancies, locations ............................................................................................................................... 10

3.3 Pressures ......................................................................................................................................................... 11

3.4 Components of refrigerating systems ................................................................................................... 12

3.5 Piping and joints ........................................................................................................................................... 14

3.6 Safety accessories ........................................................................................................................................ 15

3.7 Fluids ................................................................................................................................................................ 17

3.8 Miscellaneous ................................................................................................................................................ 20

4 Symbols and abbreviated terms ............................................................................................................. 20

5 Classification .................................................................................................................................................. 22

5.1 Access categories .......................................................................................................................................... 22

5.1.1 General ............................................................................................................................................................. 22

5.1.2 More than one access category................................................................................................................ 23

5.2 Designation and classification of refrigerants .................................................................................. 23

5.3 Location classification of refrigerating systems ............................................................................... 23

5.4 Refrigerating system classification ....................................................................................................... 24

5.4.1 General ............................................................................................................................................................. 24

5.4.2 Direct releasable systems ......................................................................................................................... 24

5.4.3 Indirect systems ........................................................................................................................................... 24

5.5 Examples of systems ................................................................................................................................... 24

5.5.1 Direct releasable systems ......................................................................................................................... 24

5.5.2 Indirect systems ........................................................................................................................................... 26

5.6 Special requirements for ice rinks ......................................................................................................... 29

6 Quantity of refrigerant ............................................................................................................................... 29

7 Space volume calculations ........................................................................................................................ 29

Annex A (informative) Equivalent terms in English, French and German ............................................ 31

Annex B (informative) Total equivalent warming impact (TEWI) .......................................................... 36

Annex C (normative) Refrigerant charge limit requirements .................................................................. 39

C.1 Charge limits requirements for refrigerating systems................................................................... 39

C.2 Charge limitations due to flammability for air conditioning systems or heat pumps

for human comfort ....................................................................................................................................... 48

C.2.1 Refrigerant-containing parts in a occupied space ........................................................................... 48

C.2.2 Special requirements for non fixed factory sealed single package air conditioning

systems or heat pumps with a limited charge ................................................................................... 48

C.3 Alternative for risk management of refrigerating systems in occupied spaces .................... 49

C.3.1 General ............................................................................................................................................................. 49

C.3.2 Allowable charge .......................................................................................................................................... 50

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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)

Annex D (informative) Protection for people who are inside cold rooms ............................................ 53

D.1 General ............................................................................................................................................................. 53

D.2 Operation of doors and emergency exit doors ................................................................................... 53

D.3 Emergency switch or signal ...................................................................................................................... 53

D.4 Cold rooms with a controlled atmosphere .......................................................................................... 54

Annex E (normative) Safety classification and information about refrigerants ................................. 55

Annex F (normative) Special requirements for ice rinks ............................................................................ 71

F.1 Indoor ice rinks ............................................................................................................................................. 71

F.2 Outdoor ice rinks and installations for similar sporting activities ............................................ 71

Annex G (informative) Potential hazards for refrigerating systems....................................................... 72

Annex H (informative) Calculation examples related to C.2 and C.3....................................................... 74

H.1 Example 1 for C.2.1 ....................................................................................................................................... 74

H.2 Example 2 for C.2.1 ....................................................................................................................................... 74

H.3 Example 3 for C.3 .......................................................................................................................................... 74

H.4 Example 4 for C.3 .......................................................................................................................................... 74

Bibliography ................................................................................................................................................................. 76

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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
European foreword

This document (EN 378-1:2016+A1:2020) 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 April 2021, and conflicting national standards shall be

withdrawn at the latest by April 2021.

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 includes Amendment 1 approved by CEN on 17 August 2020.
This document supersedes !EN 378-1:2016".

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".

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 1 with respect to the previous edition are listed below:

— harmonization as far as possible with ISO 5149:2014 and ISO 817:2014;
— adapt definitions for the purpose of harmonizing EN 378-2:2016 with PED.
Following detailed changes are worth noting:

— modification of the term “special machinery room” to “separate refrigeration machinery room” and

adapt the definition in view of combustion equipment;

— modifications/inclusion of definitions for “part of the refrigerating system” (3.1.8), “pressure

equipment” (3.1.20) and “pressure vessels” (3.4.8) in view of PED;
— movement of the location classification from Annex C to 5.3;

— rewording of the system examples in 5.3 to make the relation clear with location classification;

— replacement of Annex F (safety group) classifications by 5.2;

— modification of the approach to determine the refrigerant charge of a refrigeration system. The

charge limit requirement is decided based on the most stringent refrigerant charge that results

from the calculation based on toxicity and the calculation based on flammability. To this purpose,

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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)

the tables in Annex C are modified. Table C.1 contains requirements based on toxicity classes,

Table C.2 contains requirements based on flammability classes;

— addition of the refrigerant classes as determined in ISO 817 to toxicity classes A, B and flammability

classes 1, 2L, 2, 3;

— modification of the charge limits for refrigerants of flammability class 3, for location classification

III;
— addition of C.3, alternative risk management;

— addition of refrigerants in Annex E that have been approved for publication in ASHRAE 34 in

January 2015 (not those approved for public review in January 2015);

— inclusion in Annex E of GWP values for refrigerants in view of REGULATION (EU) No 517/2014 (F-

gas).

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 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
Introduction

This European Standard relates to safety and environmental requirements in the design, manufacture,

construction, installation, operation, maintenance, repair and disposal of refrigerating systems and

appliances regarding local and global environments. It does not related to the final destruction of the

refrigerants.

It is intended to minimize possible hazards to persons, property and the environment from

refrigerating systems and refrigerants. These hazards are associated with the physical and chemical

characteristics of refrigerants and the pressures and temperatures occurring in refrigeration cycles.

Attention is drawn to hazards such as excessive temperature at compressor discharge, liquid slugging,

erroneous operation and reduction in mechanical strength caused by corrosion, erosion, thermal stress,

liquid hammer or vibration. Corrosion deserves special consideration as conditions peculiar to

refrigerating systems arise due to alternate frosting and defrosting or the covering of equipment by

insulation.

The extent to which hazards are covered is indicated in Annex G. In addition, machinery should comply

as appropriate with EN ISO 12100 for hazards which are not covered by this European Standard.

Commonly used refrigerants except R-717 are heavier than air. Care should be taken to avoid stagnant

pockets of heavy refrigerant vapours by proper location of ventilation inlet and exhaust openings.

Refrigerants and their combinations with oils, water or other substances, can affect the system

chemically and physically. They can, if they have detrimental properties, endanger persons, property

and the environment when escaping from the refrigerating system. Refrigerants shall be selected with

due regard to their potential influence on the global environment (ODP, GWP) as well as their possible

effects on the local environment. Evaluation of the environmental performance requires a life cycle

approach. With regard to global climate change the Total Equivalent Warming Impact approach is

generally used as the basis (see Annex B). Reference should be made to the EN ISO 14040- series to

address other environmental aspects. Many factors influence environmental impacts such as:

— location of the system;
— energy efficiency of the system;
— type of refrigerant;
— service frequency;
— refrigerant leaks;
— sensitivity of charge on efficiency;
— minimization of heat load;
— control methods.

Additional investments may be directed towards reducing leaks, increasing energy efficiency or

modifying the design in order to use a different refrigerant. A life cycle approach is necessary to identify

where additional investments will have the most beneficial effects.
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
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 of EN 378 specifies the classification and selection criteria applicable to refrigerating systems.

These classification and selection criteria are used in parts 2, 3 and 4.
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 Annex E of this European Standard are not covered

by this standard.

Annex C specifies how to determine the amount of refrigerant permitted in a given space, which when

exceeded, requires additional protective measures to reduce the risk.

Annex E specifies criteria for safety and environmental considerations of different refrigerants used in

refrigeration and air conditioning.

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.

This standard also applies in the case of the conversion of a system to another refrigerant type, in which

case conformity to the relevant clauses of parts 1 to 4 of the standard shall be assessed.

Product family standards dealing with the safety of refrigerating systems takes precedence over

horizontal and generic standards covering the same subject.
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 378-2:2016, Refrigerating systems and heat pumps — Safety and environmental requirements —

Part 2: Design, construction, testing, marking and documentation

!EN 378-3:2016+A1:2020, Refrigerating systems and heat pumps - Safety and environmental

requirements - Part 3: Installation site and personal protection "

EN 12263, Refrigerating systems and heat pumps — Safety switching devices for limiting the pressure —

Requirements and tests
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)

EN 14276-2, Pressure equipment for refrigerating systems and heat pumps — Part 2: Piping — General

requirements
ISO 817:2014, Refrigerants — Designation and safety classification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE See informative Annex A for equivalent terms in English, French and German.
3.1 Refrigerating systems
3.1.1
refrigerating system
heat pump

combination of interconnected refrigerant-containing parts constituting one closed circuit in which the

refrigerant is circulated for the purpose of extracting and delivering heat (i.e. cooling and heating)

3.1.2
self-contained system

complete factory-made refrigerating system in a suitable frame and/or enclosure, that is fabricated and

transported complete, or in two or more sections and in which no refrigerant-containing parts are

connected on site other than by isolation valves, such as companion valves
3.1.3
unit system

self-contained system that has been assembled, filled ready for use and tested prior to its installation

and is installed without the need for connecting any refrigerant-containing parts

Note 1 to entry: A unit system can include factory assembled companion valves.
3.1.4
limit charged system

refrigerating system in which the internal volume and total refrigerant charge are such that, with the

system idle, the allowable pressure will not be exceeded when complete evaporation of the refrigerant

occurs
3.1.5
sorption system

refrigerating system in which refrigeration is effected by evaporation of a refrigerant, the vapour then

being absorbed or adsorbed by an absorbent or adsorbent medium respectively, from which it is

subsequently expelled at a higher partial vapour pressure by heating and then liquefied by cooling

3.1.6
secondary cooling or heating system

system employing a fluid which transfers heat from the product or spaces to be cooled or heated or

from another cooling or heating system to the refrigerating system without compression and expansion

of the fluid
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
3.1.7
sealed system

refrigerating system in which all refrigerant containing parts are made tight by welding, brazing or a

similar permanent connection which may include capped valves and capped service ports that allow

proper repair or disposal and which have a tested leakage rate of less than 3 grams per year under a

pressure of at least a quarter of the maximum allowable pressure

Note 1 to entry: Joints based on mechanical forces which are prevented from improper use by the need of a

special tool (e.g. by glue) are considered as a similar permanent connection.

Note 2 to entry: Hermetically sealed systems in EN 16084 are equivalent to sealed systems in EN 378–2.

3.1.8
part of the refrigerating system

several components assembled together and exposed to the same pressure in operation or pressure

source, respectively, as determined by the manufacturer

Note 1 to entry: The definitions 3.1.9 and 3.1.10 describe the most common situation.

3.1.9
high pressure side

part of a refrigerating system operating at approximately the condenser or gas cooler pressure

3.1.10
low pressure side

part of a refrigerating system operating at approximately the evaporator pressure

3.1.11
mobile system
refrigerating system which is usually in transit during operation

Note 1 to entry: Mobile systems includes refrigerated cargo systems in ships, refrigerating systems in fishing

boats, air conditioning on board, and transport of refrigerated cargo by road, train and containers.

3.1.12
cascade system

two or more independent refrigeration circuits where the condenser of one circuit rejects heat directly

to the evaporator of another
3.1.13
transcritical system

refrigerating system where the compressor discharges refrigerant at a pressure above the critical point

3.1.14
assembly
several components assembled to constitute an integrated and functional whole

Note 1 to entry: Assemblies are often connected together on-site to make a complete refrigerating system.

3.1.15
component
individual functional item of a refrigerating system
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
3.1.16
split system

!refrigerating system, comprising one or more factory-made indoor units in a space and one or more

factory made units which are located outside the space and which are connected on site by refrigerant

piping in accordance with the instructions of the manufacturers of the factory-made units

Note 1 to entry: Refrigerating systems include air conditioners and heat pumps."

3.1.17
multisplit system
split system with more than one indoor unit
3.1.18
indoor unit

part of the split system that controls the temperature of the air inside the building or substances located

in the building
3.1.19
fixed appliance

appliance that is intended to be used while fastened to a support or while secured in a specific location

3.1.20
pressure equipment

components of the refrigerating system, classified as pressure vessels according to definition 3.4.8,

piping including its accessories (e.g. valves) according to definition 3.5, and safety accessories according

to definition 3.6
3.2 Occupancies, locations
3.2.1
machinery room

enclosed room or space, with mechanical ventilation, sealed from public areas and not accessible to the

public, which is intended to contain components of the refrigerating system

Note 1 to entry: A machinery room can contain other equipment provided design and its installation

requirements are compatible with the requirements for the safety of the refrigerating system.

3.2.2
separate refrigeration machinery room

machinery room intended to contain only components of the refrigerating system, accessible only to

competent personnel for the purposes of inspection, maintenance and repair

Note 1 to entry: Where the standard refers to the term machinery room, separate refrigeration machinery

rooms are included.
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SIST EN 378-1:2017+A1:2021
EN 378-1:2016+A1:2020 (E)
3.2.3
occupied space

space in a building which is bounded by walls, floors and ceilings and which is occupied by persons for a

significant period

Note 1 to entry: Where the spaces around the apparent occupied space are, by construction or design, not air

tight with respect to the occupied space, these may be considered as part of the occupied space. above; e.g. false

ceilings voids, crawl ways, ducts, movable partitions and doors with transfer grilles or undercut doors.

3.2.4
hallway
corridor for the passage of people
3.2.5
exit
opening in the outer wall, with or without a door or gate
3.2.6
exit passageway

passageway immediately in the vicinity of the exit through which people leave the building

3.2.7
cold room

room maintained by a refrigerating system at a temperature lower than ambient temperature

3.2.8
open air
any unenclosed space, possibly but not necessarily roofed
3.2.9
crawl space

space that is in general accessed for maintenance only and where it is not possible to walk or access by

walking
Note 1 to entry: Usually, the height of crawl spaces is less than 1 m.
3.2.10
ventilated enclosure

enclosure containing the refrigerating system that does not enable air to flow from the enclosure to the

surrounding space and ha
...

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