ISO/FDIS 19659-4
(Main)Railway applications — Heating, ventilation and air conditioning systems for rolling stock — Part 4: Design parameters, test and inspection items for the HVAC unit
Railway applications — Heating, ventilation and air conditioning systems for rolling stock — Part 4: Design parameters, test and inspection items for the HVAC unit
This document covers the following as a guideline: - the basic design parameters to be provided to the HVAC unit manufacturer by the rolling stock manufacturer and the railway operator; - the basic test/inspection items, requirements and methods used by the HVAC unit manufacturer.
Applications ferroviaires — Systèmes de chauffage, ventilation et climatisation pour le matériel roulan — Partie 4: Paramètres de conception, éléments d’essai et d’inspection pour l’unité HVAC
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Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/TC 269/SC 2
Railway applications — Heating,
Secretariat: AFNOR
ventilation and air conditioning
Voting begins on:
systems for rolling stock —
2025-10-31
Part 4:
Voting terminates on:
2025-12-26
Design parameters, test and
inspection items for the HVAC unit
Applications ferroviaires — Systèmes de chauffage, ventilation et
climatisation pour le matériel roulan —
Partie 4: Paramètres de conception, éléments d’essai et
d’inspection pour l’unité HVAC
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 269/SC 2
Railway applications — Heating,
Secretariat: AFNOR
ventilation and air conditioning
Voting begins on:
systems for rolling stock —
Part 4:
Voting terminates on:
Design parameters, test and
inspection items for the HVAC unit
Applications ferroviaires — Systèmes de chauffage, ventilation et
climatisation pour le matériel roulan —
Partie 4: Paramètres de conception, éléments d’essai et
d’inspection pour l’unité HVAC
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviations . 2
3.1 Terms and definitions .2
3.2 Abbreviations .2
4 Prerequisites (design parameters) for the HVAC unit . 3
4.1 General .3
4.2 Design parameters to be provided to the HVAC unit manufacturer .3
4.2.1 HVAC unit installation requirements .3
4.2.2 Air flow requirements .3
4.2.3 Cooling and heating performance requirements .5
4.2.4 Electric and electronic requirements .7
4.2.5 Control requirements . .9
4.2.6 Structure requirements .11
4.2.7 Strength requirements .11
4.2.8 Component requirements. 12
4.2.9 Maintenance requirements . 12
4.2.10 Environmental requirements . 12
4.2.11 Noise and vibration requirements. 13
4.3 Summary of design parameters . 13
5 Specification .13
5.1 General . 13
5.2 Test or inspection items and requirement specifications by the HVAC unit manufacturer . 13
5.2.1 Air volume flow rate and system pressure drop test . 13
5.2.2 Cooling and heating tests . 13
5.2.3 Functional test.14
5.2.4 Cooling and heating operation and safety checks .14
5.2.5 Noise test .14
5.2.6 Blocked forces (if applicable) .14
5.2.7 Shock and vibration test . 15
5.2.8 Water tightness test . 15
5.2.9 Air tightness test (if applicable) . 15
5.2.10 Air leakage test (if applicable) . 15
5.2.11 Electrical insulation resistance and dielectric test . 15
5.2.12 Starting characteristics test .16
5.2.13 Refrigerant circuit tightness test .16
5.2.14 Mass and centre of gravity measurement .16
5.2.15 Visual, dimensional and constructional inspection.16
5.2.16 Maintainability demonstration .16
5.2.17 Marking and labelling inspection .16
5.2.18 EMC test . .16
5.2.19 Specific materials and parts tests.16
5.3 Classification of test and inspection items .17
6 Validation and verification .18
6.1 General .18
6.2 Recording and measuring instruments .18
6.2.1 General .18
6.2.2 Recording .18
6.2.3 Measuring instruments . .18
6.3 Test and inspection procedures including test facility and equipment, data to be
recorded, position of measuring points and criteria.18
iii
6.3.1 Air volume flow rate and system pressure drop test .18
6.3.2 Cooling and heating tests .21
6.3.3 Functional test. 28
6.3.4 Cooling and heating operation and safety checks . 29
6.3.5 Noise test .32
6.3.6 Blocked forces test . 36
6.3.7 Shock and vibration test . 38
6.3.8 Water tightness test . 40
6.3.9 Air tightness test .43
6.3.10 Air leakage test .45
6.3.11 Electrical insulation resistance and dielectric test . 46
6.3.12 Starting characteristics test (if applicable) .
...
ISO/TC 269/SC 2/WG 2
Secretariat: AFNOR
Date: 2025-10-17
Railway applications — Heating, ventilation and air conditioning
systems for rolling stock — —
Part 4:
Design parameters, test and inspection items for the HVAC unit
First edition
Date: 2025-02-17
ISO #####-#:####(X)
Applications ferroviaires — Systèmes de chauffage, ventilation et climatisation pour le matériel roulan —
Partie 4: Paramètres de conception, éléments d’essai et d’inspection pour l’unité HVAC
FDIS stage
2 © ISO #### – All rights reserved
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO'sISO’s member body in the country of the requester.
ISO Copyright Office copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
iii
Contents
Foreword . Error! Bookmark not defined.
Introduction . Error! Bookmark not defined.
1 Scope . Error! Bookmark not defined.
2 Normative references . Error! Bookmark not defined.
3 Terms, definitions and abbreviations . Error! Bookmark not defined.
3.1 Terms and definitions . Error! Bookmark not defined.
3.2 Abbreviations . Error! Bookmark not defined.
4 Prerequisites (design parameters) for the HVAC unit . Error! Bookmark not defined.
4.1 General . Error! Bookmark not defined.
4.2 Design parameters to be provided to the HVAC unit manufacturer . Error! Bookmark not
defined.
4.3 Summary of design parameters . Error! Bookmark not defined.
5 Specification . Error! Bookmark not defined.
5.1 General . Error! Bookmark not defined.
5.2 Test or inspection items and requirement specifications by the HVAC unit manufacturer
................................................................................................................ Error! Bookmark not defined.
5.3 Classification of test and inspection items . Error! Bookmark not defined.
6 Validation and verification . Error! Bookmark not defined.
6.1 General . Error! Bookmark not defined.
6.2 Recording and measuring instruments . Error! Bookmark not defined.
6.3 Test and inspection procedures including test facility and equipment, data to be recorded,
position of measuring points and criteria . Error! Bookmark not defined.
6.4 Test or inspection report . Error! Bookmark not defined.
(informative) List of the design parameters to be provided to the HVAC unit manufacturerError!
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Bibliography . Error! Bookmark not defined.
iv
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).
Field Code Changed
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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.
Field Code Changed
This document was prepared by Technical Committee ISO/TC 269, Railway applications, Subcommittee SC 2,
Rolling Stockstock.
A list of all parts in the ISO 19659 series can be found on the ISO website.
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.
v
Introduction
Since the heating, ventilation and air conditioning (HVAC) unit is one of the main components of the HVAC
system, its quality and performance is a key issue to improve thermal comfort and energy efficiency for rolling
stock.
The purpose is:
— — to develop a common International Standard for the validation of a HVAC unit,
— — to establish methodologies and requirements on a component basis to demonstrate conformity with
the technical specifications of the HVAC unit,
— — to establish a clear scope of responsibility in case performance issues occur after mounting the HVAC
unit on the rolling stock.
The justification is:
— Currently, we havecurrently, there is no common International Standard for the validation of a HVAC unit,;
— Generallygenerally, existing national and regional HVAC unit standards are designed for air-conditioning
systems in buildings; there only a few standards for rolling stock.;
— Thereforetherefore, there is a need to unify the methodologies of the HVAC unit standards into one single
document.;
— Thisthis will not affect any existing national or regional standard.
vi
Railway Applications applications — Heating, ventilation and air-
condition conditioning systems for rolling stock — —
Part 4:
Design parameters, test and inspection items for the HVAC unit
1 Scope
This document specifies requirements and guidelines for:
— — the design parameters to be provided to the heating, ventilation and air conditioning (HVAC) unit
manufacturer by the rolling stock manufacturer (“Customer”) and the railway operator,
— — the test and inspection items, requirements and methods used by the HVAC unit manufacturer to
verify that the HVAC unit conforms with the design parameters.
This document is applicable to HVAC units for the passenger area and driver’s cabs in urban (metro, tramway),
suburban, regional and main line vehicles.
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.
ISO 3743-1, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1: Comparison
method for a hard-walled test room
ISO 3743-2, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering methods for small, movable sources in reverberant fields — Part 2: Methods for special reverberation
test rooms
ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 3745, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Precision methods for anechoic rooms and hemi-anechoic rooms
ISO 3746, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 3747, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Engineering/survey methods for use in situ in a reverberant environment
ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 2:
Measurement by scanning
ISO 19659--1, Railway applications — Heating, ventilation and air conditioning systems for rolling stock — Part
1: Terms and definitions
ISO 19659--2, Railway applications — Heating, ventilation and air conditioning systems for rolling stock — Part
2: Thermal comfort
ISO 19659--3, Railway applications — Heating, ventilation and air conditioning systems for rolling stock — Part
3: Energy efficiency
IEC 60077--1, Railway applications — Electric equipment for rolling stock — Part 1: General service conditions
and general rules
IEC 60077--2, Railway applications — Electric equipment for rolling stock — Part 2: Electrotechnical
components - General rules
IEC 61373, Railway applications — Rolling stock equipment – Shock and vibration tests
IEC 62236--3-2, Railway applications — Electromagnetic compatibility — Part 3-2: Rolling stock — Apparatus
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19659-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.2 Abbreviations
For the purposes of this document, the abbreviations given in ISO 19659-1 apply.
AC Alternating current
CMM Coordinate measuring machine
DB Dry bulb
DC Direct current
EMC Electromagnetic compatibility
FEM Finite element method
FFT Fast Fourier transform
FST Fire, smoke and toxicity
GWP Global warming potential
HF High frequency
HVAC Heating, Ventilation and Air Conditioning
LED Light emitting diode
PTC Positive temperature coefficient
PTU Portable testing unit
RMS Root mean square
RPM Revolutions per minute
TCMS Train control monitor system
VOC Volatile organic compounds
WB Wet bulb
4 Prerequisites (design parameters) for the HVAC unit
4.1 General
The design parameters shall be clearly specified in the technical specification so that the HVAC unit
manufacturer can design and build the HVAC unit to meet the customers' requirements.
This clause gives an overview of the design parameters that should be specified as good engineering practice
including the parameters to calculate the total annual energy consumption and the total annual energy
efficiency of the HVAC unit. The latter is important, as in most cases, after the traction system, the HVAC system
is the second largest power consumer on the train.
4.2 Design parameters to be provided to the HVAC unit manufacturer
4.2.1 HVAC unit installation requirements
As a minimum, the following design parameters shall be provided:
— — the type of the railway vehicle (high speed, commuter, Cat. 1, Cat. 2, Cat. 3 in ISO 19659-2),
— — the type of the HVAC unit (compact, split in ISO 19659-1),
— — HVAC unit location (roof mounted, roof embedded, ceiling mounted, on floor mounted, under floor
mounted in ISO 19659-1),
— — the number of the HVAC units per railway vehicle.
These are summarized in Table A.1Table A.1.
4.2.2 Air flow requirements
4.2.2.1 Air volume flow rates
The following items shall be considered for air flow requirements:
a) a) Freshfresh air volume flow rate
— — fresh air volume flow rate per person depending on operating conditions as specified in
relevant national or regional standard or in its absence ISO 19659-2,
— — number of passengers (normal and maximum).);
NOTE In case the free cooling mode is required, the fresh air volume flow rate can be higher. FreeThe free
cooling mode is specified in ISO 19659-1.
b) b) Supplysupply air volume flow rate based on following heat gains
—
...
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