ISO 16494-1:2022/Amd 1:2023

INTERNATIONAL ISO
STANDARD 16494-1
First edition
2022-06
AMENDMENT 1
2023-11
Heat recovery ventilators and energy
recovery ventilators — Method of test
for performance —
Part 1:
Development of metrics for evaluation
of energy related performance
AMENDMENT 1
Ventilateurs-récupérateurs de chaleur et ventilateurs-récupérateurs
d'énergie — Méthode d'essai des performances —
Partie 1: Développement de paramètres pour l'évaluation des
performances énergétiques
AMENDEMENT 1
Reference number
ISO 16494-1:2022/Amd.1:2023(E)
ISO 16494-1:2022/Amd.1:2023(E)
© ISO 2023
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’s member body in the country of the requester.
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
ii
ISO 16494-1:2022/Amd.1:2023(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 document 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).
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.
This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning,
Subcommittee SC 6, Testing and rating of air-conditioners and heat pumps.
A list of all parts of the ISO 16494 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.
iii
ISO 16494-1:2022/Amd.1:2023(E)
Heat recovery ventilators and energy recovery
ventilators — Method of test for performance —
Part 1:
Development of metrics for evaluation of energy related
performance
AMENDMENT 1
3.6
Replace Note 1 to entry with the following:
Note 1 to entry: Indicated in Figure 1 as key 3.

3.7
Replace Note 1 to entry with the following:
Note 1 to entry: Indicated in Figure 1 as key 1.

Figure 1
Replace Figure 1 with the following:
Key
1 entering supply air (OA) and/or station 1 5 ventilator
2 leaving supply air (SA) and/or station 2 6 indoor side
3 entering exhaust air (RA) and/or station 3 7 outdoor side
4 leaving exhaust air (EA) and/or station 4
Figure 1 — Schematic numbering of airflows for heat and energy recovery ventilators
ISO 16494-1:2022/Amd.1:2023(E)

3.14
Replace Note 1 to entry with the following:
Note 1 to entry: Indicated in Figure 1 as key 4.

3.15
Replace Note 1 to entry with the following:
Note 1 to entry: Indicated in Figure 1 as key 2.

3.26
Replace Note 1 to entry with the following:
Note 1 to entry: Indicated in Figure 1 as keys 1, 2, 3 and 4.

8.2, Table 1
Replace Table 1 with the following:
Table 1 — Conditions of test for coefficient of energy and effective work test (cooling)
Standard test conditions
Parameter
T1 T2 T3 T4 T8
Temperature of dry bulb 35
entering supply
wet bulb
23 24 31 24 24
air (°C)
Temperature of dry bulb 21 24 27 27 25
entering exhaust
wet bulb
15 17 20 19 18
air (°C)
NOTE 1 Allowable variation of readings are given in Table F.2.
NOTE 2 T8 is new condition.
Annex A, Figure A.1
Replace Figure A.1 with the following:
ISO 16494-1:2022/Amd.1:2023(E)
Key
1 entering supply air (OA) and/or station 1 5 ventilator
2 leaving supply air (SA) and/or station 2 6 static pressure control apparatus
3 entering exha
...