ISO 817:2014/Amd 2:2021

INTERNATIONAL ISO
STANDARD 817
Third edition
2014-06-01
AMENDMENT 2
2021-03
Refrigerants — Designation and safety
classification
AMENDMENT 2
Fluides frigorigènes — Désignation et classification de sécurité
AMENDEMENT 2
Reference number
ISO 817:2014/Amd.2:2021(E)
©
ISO 2021
ISO 817:2014/Amd.2:2021(E)
© ISO 2021
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ISO 817:2014/Amd.2:2021(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning,
Subcommittee SC 8, Refrigerants and refrigeration lubricants.
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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 refrigerant concentration limit
RCL RCL expressed as grams per cubic metre
M
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.
ISO 817:2014/Amd.2:2021(E)
5.2
Replace the second paragraph 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
blend 1 2 n
where
x is the mole fraction of component n of the blend;
n
C is the TCF for component n in accordance with ISO 10298.
n
NOTE See Annex D for a sample calculation of ATEL and Annex E for a
...