ISO 817:2014/PRF Amd 2

ISO 817:2014/PRF Amd 2

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 817
Third edition
2014-06-01
AMENDMENT 2
Refrigerants — Designation and safety
classification
AMENDMENT 2
Fluides frigorigènes — Désignation et classification de sécurité
AMENDEMENT 2
PROOF/ÉPREUVE
Reference number
ISO 817:2014/Amd.2:2021(E)
ISO 2021
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ISO 817:2014/Amd.2:2021(E)
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© ISO 2021

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Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved
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ISO 817:2014/Amd.2:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning,

Subcommittee SC 8, Refrigerants and refrigeration lubricants.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
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ISO 817:2014/Amd.2:2021(E)
Refrigerants — Designation and safety classification
AMENDMENT 2
3.1.36
Replace Note 1 to entry with the following:

Note 1 to entry: Acute toxicity exposure limit, oxygen deprivation limit and flammable concentration

limit are refrigerant concentration limits that are determined in accordance with this document.

3.2
Delete the following text:
RCL RCL expressed as grams per cubic metre
RCL RCL expressed as parts per million by volume
ppm
4.1
Replace the text with the following:

An identifying number shall be assigned to each refrigerant. Assigned numbers and safety

classifications are shown in Tables 5, 6 and 7. Tables E.4, E.5 and E.6 provide designations for

refrigerants for which insufficient data are available for safety classification or determination of

refrigerant concentration limits.
4.4.1
Replace the text with the following:

Zeotropes shall be assigned an identifying number in the 400 series. In order to differentiate

among the different zeotropes having the same components but in different proportions, an upper-

case letter (A, B, C, etc.) is added after the number. The numbers and letters shall be assigned

considering harmonization as presented in Clause 9.
4.4.2
Replace the text with the following:

Azeotropes shall be assigned an identifying number in the 500 series. In order to differentiate

among the different azeotropes having the same components but in different proportions, an

upper-case letter (A, B, C, etc.) is added after the number. The numbers and letters shall be assigned

considering harmonization as presented in Clause 9.
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ISO 817:2014/Amd.2:2021(E)
5.2
Replace the text with the following:

The compositional designating prefixes for ethers shall substitute an “E” for “C” (carbon), such that

HFE, HCFE, and CFE refer to hydrofluoroether, hydrochlorofluoroether, and chlorofluoroether,

respectively. E in the identifying number shall be omitted when composition-designating prefixes

are used. The composition designating prefixes for halogenated olefins shall be either:

— CFC, HCFC, or HFC to refer to chlorofluorocarbon, hydrochlorofluorocarbon, or hydrofluorocarbon,

respectively; or

— with substitution of an O for the carbon C, as CFO, HCFO, HCO or HFO, to refer to chlorofluoro- olefin,

hydrochlorofluoro- olefin, hydrochloro-olefin or hydrofluoro-olefin, respectively.

Clause 8
Replace the title with the following:
8 Refrigerant concentration limits
8.1
Replace the text with the following:

Determination of the refrigerant concentration limits shall assume full vaporization and uniform

mixing; no removal by dissolution, reaction or decomposition in the volume to which it is released.

Safety factors are included for consideration of temporary local concentrations or uncertainties in

the test data.
8.1.1.1
Replace the text with the following:

The ATEL shall be the lowest of the toxic concentration factors (TCF) 8.1.1.2 to 8.1.1.5. For blends,

where available, the blend toxicity data shall be used for the individual parameter values in 8.1.1.1

to 8.1.1.5 and when toxicity data for the blends are not available, shall be calculated according to

the following formula:
X X X
1 2 n
=+ +…+
C C C C
1 2 n
where
x is the mole fraction of component n of the blend;
C is the TCF for component n in accordance with ISO 10298.

NOTE See Annex D for a sample calculation of ATEL and Annex E for a list of values relate

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