Heat exchangers - Hydronic room fan coil units - Test procedures for establishing the performance

This European Standard applies to hydronic fan coil units (FCU) as factory-made single assemblies which provide the functions of cooling and/or heating but do not include the source of cooling or heating.
The standard covers both air free delivery and air ducted units with a maximum external static pressure due to duct resistance of 120 Pa max.
The standard applies to all types of fan speed control of a fan coil unit (variable speed, multispeed).
This standard deals with the cooling and heating functions of the FCU considered as an emitter for cooling/heating of a room/space. It does not cover any ventilation function of the unit.
If the FCU can also provide fresh air, this function is not considered and the fresh air inlet closed during testing.
This European Standard provides a method for the determination of the thermal performance of fan coil units in standard conditions, for the use with hot or chilled water or water mixtures. The test procedures given in this standard may additionally be used for determining performance at other conditions.
It also provides the method for the determination of the air flow rate supplied by the fan coil unit.
The standard does not cover the rating of heating or cooling from direct expansion coils or heating from electric resistance elements.
The standard does not cover acoustic performance of fan coil units which is dealt with in EN 16583.
It is not the purpose of this standard to specify the tests used for production or field testing.
NOTE   For the purpose of remaining clauses, the term “unit” is used to mean “fan coil unit” as defined in 3.1.

Wärmeübertrager - Wasser-Luft-Ventilatorkonvektoren - Prüfverfahren zur Leistungsfeststellung

Dieses Dokument ist anzuwenden für fabrikmäßig gefertigte einzelne Baueinheiten von Wasser-Luft-Ventilatorkonvektoren (Ventilatorkonvektor, FCU, en: fan coil unit), die eine Kühl- und/oder Heizfunktion bieten, jedoch keine eigene Kühl- oder Heizquelle enthalten.
Dieses Dokument ist sowohl für Geräte mit ungehinderter Luftabgabe als auch solche mit Luftkanalanschluss anzuwenden, die aufgrund des Kanalwiderstands einen maximalen statischen Außendruck von höchstens 120 Pa aufweisen.
Dieses Dokument ist anzuwenden für alle Arten der Drehzahlregelung für den Ventilator eines Ventilatorkonvektors(variable Drehzahl, mehrere Drehzahlen).
Dieses Dokument ist anzuwenden für die Kühl- und die Heizfunktion des für das Kühlen/Heizen eines Raumes als Strahler angesehenen FCU. Für die Lüftungsfunktion der Geräte ist es nicht anzuwenden.
Sofern der FCU auch Frischluft bereitstellen kann, wird diese Funktion nicht berücksichtigt und der Frischlufteintritt bleibt während der Prüfung geschlossen.
Dieses Dokument legt ein Verfahren zur Bestimmung des wärmetechnischen Verhaltens von Ventilatorkonvektoren unter Normbedingungen, bei Anwendung mit heißem oder gekühltem Wasser oder Wassergemischen fest. Die in dieser Norm angegebenen Prüfverfahren dürfen darüber hinaus zur Bestimmung des Verhaltens unter weiteren Bedingungen angewendet werden.
Die Norm legt auch das Verfahren zur Bestimmung des durch den Ventilatorkonvektor bereitgestellten Luftvolumenstroms fest.
Dieses Dokument ist nicht anzuwenden für die Bemessung der Heiz- oder Kühlleistung von Direktverdampfungsregistern bzw. der Heizleistung von elektrischen Widerstandsheizelementen.
Dieses Dokument ist nicht anzuwenden für das akustische Verhalten von Ventilatorkonvektoren; dieses wird in EN 16583 behandelt.
Die Festlegung von Produktions- oder Einsatzprüfungen ist nicht Zweck dieses Dokuments.
ANMERKUNG   In den folgenden Abschnitten steht die Benennung „Gerät“ für „Ventilatorkonvektor“ entsprechend der Definition nach 3.1.

Échangeurs thermiques - Ventilo-convecteurs à eau - Procédures d'essai pour la détermination des performances

Le présente document s'applique aux ventilo-convecteurs à eau en tant qu'ensembles autonomes fabriqués en usine, assurant des fonctions de refroidissement et/ou de chauffage, mais n'incluant pas la source de refroidissement ou de chauffage.
Le présente document concerne les unités à soufflage libre et les unités raccordées sur l’air conçues pour une pression statique externe due à la résistance du circuit de 120 Pa maximum.
Le présente document s'applique à tous les types de régulation de vitesse du ventilateur d'un ventilo-convecteur (vitesse variable, multi-vitesse).
Le présente document traite des fonctions de refroidissement et de chauffage des ventilo-convecteurs à eau considérés comme source d’émission de refroidissement et de chauffage d'une salle ou d'un espace. Elle ne s'applique pas à la fonction ventilation de l’unité.
Si le ventilo-convecteur peut également délivrer de l'air neuf, cette fonction n'est pas prise en compte et l'arrivée d'air neuf doit être obturée pendant les essais.
Le présente document définit une méthode pour déterminer les performances thermiques de ventilo-convecteurs dans des conditions nominales de fonctionnement avec de l'eau chaude ou glacée, ou des solutions aqueuses. Les modes opératoires d'essai qui figurent dans la présente norme peuvent, en outre, être utilisés pour déterminer les performances dans d'autres conditions.
Le présente document définit également la méthode de détermination du débit d'air fourni par le ventilo-convecteur.
Le présente document ne traite pas de l’évaluation des caractéristiques de chauffage ou de refroidissement par batterie à détente directe ou de chauffage par éléments à résistances électriques.
Le présente document ne traite pas des performances acoustiques des ventilo-convecteurs. Celles-ci sont traitées dans l'EN 16583.
Le présente document n'a pas pour objet de spécifier les types d'essais utilisés en production ou sur site.
NOTE Pour les besoins des articles ci-après, le terme « unité » est utilisé pour désigner un « ventilo-convecteur » tel que défini en 3.1.

Prenosniki toplote - Ventilatorski konvektorji voda/zrak - Preskusni postopki za ugotavljanje lastnosti

General Information

Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
01-Sep-2021
Completion Date
01-Sep-2021

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SLOVENSKI STANDARD
SIST EN 1397:2021
01-november-2021
Nadomešča:
SIST EN 1397:2015
SIST EN 1397:2015/AC:2016
Prenosniki toplote - Ventilatorski konvektorji voda/zrak - Preskusni postopki za
ugotavljanje lastnosti

Heat exchangers - Hydronic room fan coil units - Test procedures for establishing the

performance
Wärmeübertrager - Wasser-Luft-Ventilatorkonvektoren - Prüfverfahren zur
Leistungsfeststellung
Échangeurs thermiques - Ventilo-convecteurs à eau - Procédures d'essai pour la
détermination des performances
Ta slovenski standard je istoveten z: EN 1397:2021
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
SIST EN 1397:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 1397:2021
---------------------- Page: 2 ----------------------
SIST EN 1397:2021
EN 1397
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 27.060.30 Supersedes EN 1397:2015
English Version
Heat exchangers - Hydronic room fan coil units - Test
procedures for establishing the performance

Échangeurs thermiques - Ventilo-convecteurs à eau - Wärmeübertrager - Wasser-Luft-

Procédures d'essai pour la détermination des Ventilatorkonvektoren - Prüfverfahren zur

performances Leistungsfeststellung
This European Standard was approved by CEN on 23 May 2021.

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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1397:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
Contents Page

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

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Designation of fan coil units ........................................................................................................................ 7

5 Symbols ............................................................................................................................................................... 7

6 Air flow rate test for ducted units ............................................................................................................. 8

6.1 General conditions .......................................................................................................................................... 8

6.2 Test installation ............................................................................................................................................... 8

6.2.1 Outlet measurement method ...................................................................................................................... 8

6.2.2 Inlet measurement method ......................................................................................................................... 9

6.3 Pressure settings .......................................................................................................................................... 10

6.4 Standard rating conditions ....................................................................................................................... 11

6.5 Test procedure .............................................................................................................................................. 11

6.6 Data to be recorded ..................................................................................................................................... 12

7 Capacity rating tests .................................................................................................................................... 13

7.1 General conditions ....................................................................................................................................... 13

7.2 Test room ........................................................................................................................................................ 13

7.3 Installation of the test object ................................................................................................................... 13

7.4 Standard rating conditions ....................................................................................................................... 13

7.4.1 Air flow conditions ...................................................................................................................................... 13

7.4.2 Temperature conditions ............................................................................................................................ 14

7.4.3 Electrical conditions ................................................................................................................................... 14

7.5 Test method ................................................................................................................................................... 14

7.5.1 General ............................................................................................................................................................. 14

7.5.2 Cooling capacity ............................................................................................................................................ 15

7.5.3 Total heating capacity ................................................................................................................................ 16

7.5.4 Total electric power input ........................................................................................................................ 16

7.6 Measurements criteria ............................................................................................................................... 16

7.6.1 Air inlet dry bulb temperature ................................................................................................................ 16

7.6.2 Moisture content .......................................................................................................................................... 17

7.6.3 Liquid temperature ..................................................................................................................................... 17

7.6.4 Liquid pressure ............................................................................................................................................. 17

7.6.5 Condensate flow rate .................................................................................................................................. 17

7.6.6 Steady-state conditions .............................................................................................................................. 17

7.7 Uncertainties of measurement from indicated values ................................................................... 18

7.8 Test duration ................................................................................................................................................. 19

7.9 Data to be recorded ..................................................................................................................................... 19

8 Operating tests .............................................................................................................................................. 20

8.1 General ............................................................................................................................................................. 20

8.2 Test conditions .............................................................................................................................................. 20

8.3 Sweat test ........................................................................................................................................................ 20

8.4 Condensate disposal test ........................................................................................................................... 21

---------------------- Page: 4 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)

9 Test report ...................................................................................................................................................... 21

9.1 General information .................................................................................................................................... 21

9.2 Additional information ............................................................................................................................... 21

9.3 Test results ...................................................................................................................................................... 21

10 Manufacturer's data ..................................................................................................................................... 22

Annex A (informative) Drawings of the different types of configurations of fan coil units ............ 23

A.1 General ............................................................................................................................................................. 23

A.2 Non ducted units ........................................................................................................................................... 23

A.3 Ducted units .................................................................................................................................................... 24

Annex B (informative) Air flow rate test for non-ducted units ................................................................. 26

B.1 General conditions ....................................................................................................................................... 26

B.2 Testing equipment ....................................................................................................................................... 26

B.3 Test installation ............................................................................................................................................ 26

B.4 Standard rating conditions ....................................................................................................................... 26

B.5 Test procedure .............................................................................................................................................. 26

B.6 Data to be recorded...................................................................................................................................... 27

Annex C (normative) Design of separation partition for testing of cassette type fan coil

units ................................................................................................................................................................... 28

C.1 General ............................................................................................................................................................. 28

C.2 1-way and 2-way cassette type ................................................................................................................ 28

C.3 4-way cassette type ...................................................................................................................................... 29

Annex ZA (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Regulation (EU) No 2016/2281 (OJEU L346/1-50,

20.12.2016) aimed to be covered ........................................................................................................... 30

---------------------- Page: 5 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
European foreword

This document (EN 1397:2021) has been prepared by Technical Committee CEN/TC 113 “Heat pumps

and air conditioning units”, the secretariat of which is held by UNE.

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 March 2022, and conflicting national standards shall be

withdrawn at the latest by March 2022.

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 supersedes EN 1397:2015.

This document has been prepared under a Standardization Request given to CEN by the European

Commission and the European Free Trade Association, and supports essential requirements of EU

Directive(s) / Regulation(s).

For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part

of this document.

This document was prepared in the framework of the Commission Regulation (EU) 2016/2281 of

30 November 2016 implementing Directive 2009/125/EC of the European Parliament and of the Council

establishing a framework for the setting of ecodesign requirements for energy-related products, with

regard to ecodesign requirements for air heating products, cooling products, high temperature process

chillers and fan coil units.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

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.
---------------------- Page: 6 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
1 Scope

This document applies to hydronic fan coil units (FCU) as factory-made single assemblies which provide

the functions of cooling and/or heating but do not include the source of cooling or heating.

This document covers both air free delivery and air ducted units with a maximum external static pressure

due to duct resistance of 120 Pa max.

This document applies to all types of fan speed control of a fan coil unit (variable speed, multispeed).

This document deals with the cooling and heating functions of the FCU considered as an emitter for

cooling/heating of a room/space. It does not cover any ventilation function of the unit.

If the FCU can also provide fresh air, this function is not considered and the fresh air inlet closed during

testing.

This document provides a method for the determination of the thermal performance of fan coil units in

standard conditions, for the use with hot or chilled water or water mixtures. The test procedures given

in this standard may additionally be used for determining performance at other conditions.

It also provides the method for the determination of the air flow rate supplied by the fan coil unit.

This document does not cover the rating of heating or cooling from direct expansion coils or heating from

electric resistance elements.

This document does not cover acoustic performance of fan coil units which is dealt with in EN 16583.

It is not the purpose of this document to specify the tests used for production or field testing.

NOTE For the purpose of remaining clauses, the term “unit” is used to mean “fan coil unit” as defined in 3.1.

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.

EN ISO 5801:2017, Fans - Performance testing using standardized airways (ISO 5801:2017)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
hydronic fan-coil unit

factory-made single assembly which provides one or more of the functions of forced circulation of air,

heating, cooling, dehumidification and filtering of air, but which does not include the source of heating or

cooling

Note 1 to entry: This device includes at least a liquid-to-air heat exchanger and a fan, and may be designed for

free or ducted intake air and/or for free or ducted delivery of supply air.
---------------------- Page: 7 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
3.2
total heating capacity
total heat added to the air by the unit
3.3
total cooling capacity

total heat removed from the air by the unit which is the sum of the sensible and latent cooling capacities

3.4
sensible cooling capacity
heat which is removed from the air by means of a dry-bulb temperature drop
3.5
latent cooling capacity

heat which is removed from the air by condensation of water vapour on the cooling coil

3.6
total electric power input

total electric power absorbed by the unit, including fan(s) and auxiliary devices but excluding any

electrical resistance heater

Note 1 to entry: When a unit is equipped with a drain pump which continuously operates, the drain pump power

input is included in the total electric power input.
3.7
2-pipe fan coil unit

fan coil unit having a single coil, one supply pipe, supplying either cold or hot water to the unit, and one

return pipe

Note 1 to entry: The fan coil unit can include an electrical resistance for heating purpose, but not in operation

during testing.
3.8
4-pipe fan coil unit

fan coil unit having one coil with two independent water circuits for cooling and heating, or two

independent cooling/heating coils
3.9
standard rating condition
mandatory condition that is used for comparison purposes
3.10
application rating condition

optional rating condition which provides additional information on the performance of the unit

3.11
standard fan speed

fan speed setting declared by the manufacturer and used for setting the air flow rate conditions of ducted

units

Note 1 to entry: The fan speed setting can be declared by the manufacturer as a certain wiring, a switch position

or a steering voltage.
---------------------- Page: 8 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
3.12
external static pressure

positive pressure difference measured between the air outlet and inlet sections of the unit

3.13
liquid pressure drop

negative pressure difference measured between the outlet and inlet connections of the liquid circuit of

the unit
4 Designation of fan coil units

Fan coil units can be ducted or non-ducted. They can be standing on the floor, hung on the wall, or fitted

into the ceiling or floor, with the inlet and outlet air sections located either on the front, back, bottom or

top of the unit.

Annex A provides a series of drawing schemes associated to designations to show typical existing

configurations.
5 Symbols
For the purposes of this document, the symbols indicated in Table 1 apply.
Table 1 — Symbols
Symbol Description Unit
cpL1 Specific heat capacity of liquid at inlet connection kJ/(kg K)
c Specific heat capacity of liquid at outlet connection kJ/(kg K)
pL2
h Specific enthalpy of liquid at inlet connection (= c × t ) kJ/kg
L1 pL1 L1
h Specific enthalpy of liquid at outlet connection (= c × t ) kJ/kg
L2 pL2 L2
Δh Vaporization heat of water (constant = 2460) kJ/kg
n Rotational speed of the fan at air flow test min
n Rotational speed of the fan at capacity test min
P Total electric power input W
elec
P Total electric power input in cooling mode W
elec_C
P Total electric power input in heating mode W
elec_H
P Latent cooling capacity W
lat
P Sensible cooling capacity W
sens
P Total cooling capacity W
P Total heating capacity W
P Atmospheric pressure kPa
atm
pA External static pressure Pa
q Mass flow rate of air kg/s
q Mass flow rate of liquid g/s
---------------------- Page: 9 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
Symbol Description Unit
q Mass flow rate of condensate (air side) g/s
t Liquid inlet temperature °C
t Liquid outlet temperature °C
t Air inlet dry bulb temperature °C
t Air inlet dew point temperature °C
Adp
t Air inlet wet bulb temperature °C
Δp Liquid side pressure drop kPa
6 Air flow rate test for ducted units
6.1 General conditions
The test is required to measure the outlet air flow rate of ducted units.

For non-ducted units or ducted units with a declared static pressure lower than 50 Pa at standard fan

speed, the test is optional and is described in the informative Annex B.

For testing, the unit shall include an air filter but no any other accessory for air inlet or diffusion or others.

Dampers for fresh air intake shall be closed.
NOTE 1 No modification such as sealing is made on the unit before testing.

If the unit includes flaps, they shall be adjusted in a fixed position according to the manufacturer

instructions. If this information is not available, their position shall correspond to the maximum

mechanical open position.

NOTE 2 This maximum mechanical open position might differ from the minimum airflow resistance.

6.2 Test installation
6.2.1 Outlet measurement method
The installation is described in Figure 1.

The air flow measurement equipment consists of a test chamber, an air flow measuring device and an

auxiliary fan.

The discharge section of the fan coil unit is connected to the test chamber through a ductwork having an

adjustable resistance. In case of several outlet sections, the ductwork shall contain all of them.

For units that can be ducted at the inlet, the tests are performed without inlet duct(s).

EN ISO 5801:2017, Category “B” installation may be used.
---------------------- Page: 10 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
Key
1 object under test (with 0 Pa at the inlet)
2 measured air flow
3 external static pressure
4 ductwork
5 adjustable duct resistance (e.g. damper)
6 test chamber with airflow measuring apparatus
7 fan (may be inside or outside the discharge chamber)
Figure 1 — Schematic of test installation (outlet measurement method)
6.2.2 Inlet measurement method
The installation is described in Figure 2.

The fan coil unit is placed in a chamber. The air flow measuring device is connected to the entrance of

this chamber.

The outlet section of the unit is connected to a ductwork including a damper for adjusting the external

static pressure. In case of several outlet sections, the ductwork shall contain all of them.

EN ISO 5801:2017, Category “B” installation may be used.
---------------------- Page: 11 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
Key
1 object under test (with 0 Pa at the inlet) 6 airflow measuring apparatus
2 measured air flow 7 fan
3 external static pressure 8 test chamber
4 ductwork 9 flow straightener
5 adjustable duct resistance (e.g. damper)
Figure 2 — Schematic of test installation (inlet measurement method)
6.3 Pressure settings

For the standard fan speed declared by the manufacturer, the following conditions shall be fulfilled:

— 0 Pa at the inlet of the unit;
— an external static pressure (ESP) of 50 Pa at the outlet of the unit;
— inside the test chamber a static pressure equal to 0 Pa.

For air flow rate measurements at other fan speeds than the standard fan speed, the following apply:

— no change in the position of the adjustable outlet duct resistance;
— 0 Pa at the inlet of the unit;

— inside the test chamber a static pressure equal to 0 Pa, so that the same network curve resistance is

used (see Figure 3).
---------------------- Page: 12 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
Key
1 ductwork load curve
2 reference standard speed
3 other speeds
X external static pressure difference (Pa)
Y flow rate

Figure 3 — Setup external static pressure difference of ducted units other speeds

6.4 Standard rating conditions

The air flow rate measurement shall be made in isothermal conditions with dry coil, at an ambient

temperature of 20 °C and at nominal voltage and frequency as specified by the manufacturer, for all fan

speeds declared by the manufacturer.
6.5 Test procedure
The fan coil shall be dry and the liquid circulation pump shall be stopped.

The ESP of 50 Pa shall refer to standard air conditions (1,2 kg/m , 20 °C at atmospheric pressure).

Depending on the atmospheric conditions of the location, the ESP shall be set as stated in Formula (1).

lab
ESP ESP×
lab std
std
(1)
---------------------- Page: 13 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
where

ESP is the external static pressure to be set at the atmospheric and temperature conditions of the

lab
location;
ESP is the external static pressure at standard air conditions and equals 50 Pa;
std

ρ is the air density at the atmospheric and temperature conditions of the location;

lab
ρ is the air density at standard air conditions.
std

The fan motor shall run for at least half an hour before measuring the flow rate.

The air flow rate measurement shall be conducted under steady-state conditions, which are assumed to

be achieved when the rotational speed of the fan motor(s) does not change by more than 1 % but not less

than 10 r/min within 15 min.

All the tests shall be performed within the permissible deviations specified in Table 2.

Table 2 — Permissible deviations from set values
Permissible deviations of the Permissible deviations of
Measured quantity arithmetic mean values from time-individual measured
set values values from set values
Ambient air: dry bulb temperature ±5 K ±5 K
Voltage ±1 % ±2 %
Pressure ±1 Pa ±5 Pa
6.6 Data to be recorded

The data to be recorded for the air flow rate test are given in Table 3. The table identifies the general

information required but is not intended to limit the data to be obtained.
Table 3 — Data to be recorded
Symbol Unit
Atmospheric pressure P kPa
atm
Voltage — V
Frequency — Hz
Speed control setting of the fan speed — —
Total power input P W
elec
Rotational speed of the fan n min
Air inlet dry bulb temperature t °C
Air inlet dew point temperature t °C
Adp
Volume flow rate of air q m /h
Mass flow rate of air q kg/s
External static pressure p Pa
---------------------- Page: 14 ----------------------
SIST EN 1397:2021
EN 1397:2021 (E)
7 Capacity rating tests
7.1 General conditions

For testing the unit shall include an air filter but no any other accessory for air inlet or diffusion or others.

Dampers for fresh air intake shall be closed.
No electric resistance heater shall be powered during the tests.
NOTE No modification such as sealing is made on the unit before testing.

During the cooling test, for units having a drain pump continuously operating, the drain pump shall be in

operation. For other units, the drain pump shall be prevented from operating. Free gravitational draining

of the condensate shall be forced (e.g. using the maintenance plug of the drain pan).

7.2 Test room

The test room shall be of sufficient volume and shall circulate air in such a manner that it does not change

the normal return air circulating pattern of the unit.

To comply with this, the air velocities at a distance of 0,5 m from the air inlet section area of the unit

under test shall not exceed 0,5 m/s when the unit is stopped.
For free delivery units, dimensions shall be such that the dista
...

SLOVENSKI STANDARD
oSIST prEN 1397:2020
01-maj-2020

Prenosniki toplote - Ventilatorski konvektorji voda/zrak - Postopki preskušanja za

ugotavljanje tehničnih karakteristik

Heat exchangers - Hydronic room fan coil units - Test procedures for establishing the

performance
Wärmeübertrager - Wasser-Luft-Ventilatorkonvektoren - Prüfverfahren zur
Leistungsfeststellung
Échangeurs thermiques - Ventilo-convecteurs à eau - Procédures d'essai pour la
détermination des performances
Ta slovenski standard je istoveten z: prEN 1397
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
oSIST prEN 1397:2020 en,fr,de

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

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oSIST prEN 1397:2020
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oSIST prEN 1397:2020
DRAFT
EUROPEAN STANDARD
prEN 1397
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS Will supersede EN 1397:2015
English Version
Heat exchangers - Hydronic room fan coil units - Test
procedures for establishing the performance

Échangeurs thermiques - Ventilo-convecteurs à eau - Wärmeübertrager - Wasser-Luft-

Procédures d'essai pour la détermination des Ventilatorkonvektoren - Prüfverfahren zur

performances Leistungsfeststellung

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 113.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
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. prEN 1397:2020 E

worldwide for CEN national Members.
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Contents Page

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

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Designation of fan coil units ........................................................................................................................ 7

5 Symbols ............................................................................................................................................................... 7

6 Air flow rate test for ducted units ............................................................................................................. 8

6.1 General conditions .......................................................................................................................................... 8

6.2 Test installation ............................................................................................................................................... 8

6.2.1 Outlet measurement method ...................................................................................................................... 8

6.2.2 Inlet measurement method ......................................................................................................................... 9

6.3 Pressure settings .......................................................................................................................................... 10

6.4 Standard rating conditions ....................................................................................................................... 11

6.5 Test procedure .............................................................................................................................................. 11

6.6 Data to be recorded ..................................................................................................................................... 12

7 Capacity rating tests .................................................................................................................................... 12

7.1 General conditions ....................................................................................................................................... 12

7.2 Test room ........................................................................................................................................................ 13

7.3 Installation of the test object ................................................................................................................... 13

7.4 Standard rating conditions ....................................................................................................................... 13

7.4.1 Air flow conditions ...................................................................................................................................... 13

7.4.2 Temperature conditions ............................................................................................................................ 13

7.4.3 Electrical conditions ................................................................................................................................... 14

7.5 Test method ................................................................................................................................................... 14

7.5.1 General ............................................................................................................................................................. 14

7.5.2 Cooling capacity ............................................................................................................................................ 15

7.5.3 Heating capacity ........................................................................................................................................... 15

7.6 Measurements criteria ............................................................................................................................... 16

7.6.1 Air inlet dry bulb temperature ................................................................................................................ 16

7.6.2 Moisture content .......................................................................................................................................... 16

7.6.3 Liquid temperature ..................................................................................................................................... 16

7.6.4 Liquid pressures ........................................................................................................................................... 16

7.6.5 Condensate flow rate .................................................................................................................................. 16

7.6.6 Steady-state conditions .............................................................................................................................. 17

7.7 Uncertainties of measurement from indicated values ................................................................... 17

7.8 Test duration ................................................................................................................................................. 18

7.9 Data to be recorded ..................................................................................................................................... 18

8 Performance tests ........................................................................................................................................ 19

8.1 General ............................................................................................................................................................. 19

8.2 Test conditions .............................................................................................................................................. 19

8.3 Sweat test ........................................................................................................................................................ 20

8.4 Condensate disposal test ........................................................................................................................... 20

9 Test report ...................................................................................................................................................... 21

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9.1 General information .................................................................................................................................... 21

9.2 Additional information ............................................................................................................................... 21

9.3 Test results ...................................................................................................................................................... 21

10 Manufacturer's data ..................................................................................................................................... 21

Annex A (informative) Drawings of the different types of configurations of fan coil units ............ 23

A.1 General ............................................................................................................................................................. 23

A.2 Non ducted units ........................................................................................................................................... 23

A.3 Ducted units .................................................................................................................................................... 24

Annex B (informative) Air flow rate test for non-ducted units ................................................................. 26

B.1 General conditions ....................................................................................................................................... 26

B.2 Testing equipment ....................................................................................................................................... 26

B.3 Test installation ............................................................................................................................................ 26

B.4 Standard rating conditions ....................................................................................................................... 26

B.5 Test procedure .............................................................................................................................................. 27

B.6 Data to be recorded...................................................................................................................................... 27

Annex C (normative) Design of separation partition for testing of cassette type fan coil

units ................................................................................................................................................................... 28

C.1 General ............................................................................................................................................................. 28

C.2 1-way and 2-way cassette type ................................................................................................................ 28

C.3 4-way cassette type ...................................................................................................................................... 29

Annex ZA (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Regulation (EU) No 2016/2281 aimed to be covered........... 30

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European foreword

This document (prEN 1397:2020) has been prepared by Technical Committee CEN/TC 113 “Heat pumps

and air conditioning units”, the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1397:2015.

This document has been prepared under a standardization request given to CEN by the European

Commission and the European Free Trade Association, and supports essential requirements of

EU Directive.

For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.

This document was prepared in the framework of the Commission Regulation (EU) 2016/2281 of

30 November 2016 implementing Directive 2009/125/EC of the European Parliament and of the Council

establishing a framework for the setting of ecodesign requirements for energy-related products, with

regard to ecodesign requirements for air heating products, cooling products, high temperature process

chillers and fan coil units.
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1 Scope

This document applies to hydronic fan coil units (FCU) as factory-made single assemblies which provide

the functions of cooling and/or heating but do not include the source of cooling or heating.

This document covers both air free delivery and air ducted units with a maximum external static pressure

due to duct resistance of 120 Pa max.

This document applies to all types of fan speed control of a fan coil unit (variable speed, multispeed).

This document deals with the cooling and heating functions of the FCU considered as an emitter for

cooling/heating of a room/space. It does not cover any ventilation function of the unit.

If the FCU can also provide fresh air, this function is not considered and the fresh air inlet closed during

testing.

This document provides a method for the determination of the thermal performance of fan coil units in

standard conditions, for the use with hot or chilled water or water mixtures. The test procedures given

in this standard may additionally be used for determining performance at other conditions.

It also provides the method for the determination of the air flow rate supplied by the fan coil unit.

This document does not cover the rating of heating or cooling from direct expansion coils or heating from

electric resistance elements.

This document does not cover acoustic performance of fan coil units which is dealt with in EN 16583.

It is not the purpose of this document to specify the tests used for production or field testing.

NOTE For the purpose of remaining clauses, the term “unit” is used to mean “fan coil unit” as defined in 3.1.

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 5801:2017, Fans — Performance testing using standardized airways
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
hydronic fan-coil unit

factory-made single assembly which provides one or more of the functions of forced circulation of air,

heating, cooling, dehumidification and filtering of air, but which does not include the source of heating or

cooling

Note 1 to entry: This device includes at least a liquid-to-air heat exchanger and a fan, and may be designed for

free or ducted intake air and/or for free or ducted delivery of supply air.
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3.2
heating capacity
total heat added to the air by the unit
3.3
total cooling capacity

total heat removed from the air by the unit which is the sum of the sensible and latent cooling capacities

3.4
sensible cooling capacity
heat which is removed from the air by means of a dry-bulb temperature drop
3.5
latent cooling capacity

heat which is removed from the air by condensation of water vapour on the cooling coil

3.6
total electric power input

total electric power absorbed by the unit, including fan(s) and auxiliary devices but excluding any

electrical resistance heater
3.7
2-pipe fan coil unit

fan coil unit having a single coil, one supply pipe, supplying either cold or hot water to the unit, and one

return pipe

Note 1 to entry: The fan coil unit can include an electrical resistance for heating purpose.

3.8
4-pipe fan coil unit

fan coil unit having one coil with two independent water circuits for cooling and heating, or two

independent cooling/heating coils
3.9
standard rating condition
mandatory condition that is used for comparison purposes
3.10
application rating condition

optional rating condition which provides additional information on the performance of the unit

3.11
standard fan speed

fan speed setting declared by the manufacturer and used for setting the air flow rate conditions of ducted

units

Note 1 to entry: The fan speed setting can be declared by the manufacturer as a certain wiring, a switch position

or a steering voltage.
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3.12
external static pressure

positive pressure difference measured between the air outlet and inlet sections of the unit

3.13
liquid pressure drop

negative pressure difference measured between the outlet and inlet connections of the liquid circuit of

the unit
4 Designation of fan coil units

Fan coil units can be ducted or non-ducted. They can be standing on the floor, hung on the wall, or fitted

into the ceiling or floor, with the inlet and outlet air sections located either on the front, back, bottom or

top of the unit.

Annex A provides a series of drawing schemes associated to designations to show typical existing

configurations.
5 Symbols
For the purposes of this document, the symbols indicated in Table 1 apply.
Table 1 — Symbols
Symbol Description Unit
cpL Specific heat capacity of liquid kJ/(kg K)
h Specific enthalpy of liquid at inlet connection (= c × t ) kJ/kg
L1 pL1 L1
h Specific enthalpy of liquid at outlet connection (= c × t ) kJ/kg
L2 pL2 L2
Δh Vaporization heat of water (constant = 2460) kJ/kg
n Rotational speed of the fan at air flow test min
n Rotational speed of the fan at capacity test min
P Total electric power input in cooling mode W
elec
P Total electric power input in heating mode W
elec_C
P Total electric power input W
elec_H
P Latent cooling capacity W
lat
P Sensible cooling capacity W
sens
P Total cooling capacity W
P Heating capacity W
P Atmospheric pressure kPa
atm
p External static pressure Pa
qmA Mass flow rate of air kg/s
q Mass flow rate of liquid g/s
q Mass flow rate of condensate (air side) g/s
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Symbol Description Unit
t Liquid inlet temperature °C
t Liquid outlet temperature °C
t Air inlet dry bulb temperature °C
t Air inlet dew point temperature °C
Adp
t Air inlet wet bulb temperature °C
Δp Liquid side pressure drop kPa
6 Air flow rate test for ducted units
6.1 General conditions
The test is required to measure the outlet air flow rate of ducted units.

For non-ducted units or ducted units with a declared static pressure lower than 50 Pa at standard fan

speed, the test is optional and is described in the informative Annex B.

For testing, the unit shall include an air filter but no any other accessory for air inlet or diffusion or others.

Dampers for fresh air intake shall be closed.
NOTE 1 No modification such as sealing is made on the unit before testing.

If the unit includes flaps, they shall be adjusted in a fixed position according to the manufacturer

instructions. If this information is not available, their position shall correspond to the maximum

mechanical open position.

NOTE 2 This maximum mechanical open position might differ from the minimum airflow resistance.

6.2 Test installation
6.2.1 Outlet measurement method
The installation is described in Figure 1.

The air flow measurement equipment consists of a test chamber, an air flow measuring device and an

auxiliary fan, all in accordance with ISO 5801, installation category “B”.

The discharge section of the fan coil unit shall be connected to the test chamber through a ductwork

having an adjustable resistance, and made in compliance with ISO 5801. In case of several outlet sections,

the ductwork shall contain all of them.

For units that can be ducted at the inlet, the tests are performed without inlet duct(s).

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Key

1 object under test (with 0 Pa at the inlet) 5 adjustable duct resistance (e.g. damper)

2 measured air flow 6 test chamber with airflow measuring apparatus

3 external static pressure 7 fan (may be inside or outside the discharge chamber)

4 ductwork
Figure 1 — Schematic of test installation (outlet measurement method)
6.2.2 Inlet measurement method
The installation is described in Figure 2.

The fan coil unit is placed in a chamber. The air flow measuring device is connected to the entrance of

this chamber.

The outlet section of the unit is connected to a ductwork including a damper for adjusting the external

static pressure. In case of several outlet sections, the ductwork shall contain all of them.

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Key
1 object under test (with 0 Pa at the inlet) 6 airflow measuring apparatus
2 measured air flow 7 fan
3 external static pressure 8 test chamber
4 ductwork 9 flow straightener
5 adjustable duct resistance (e.g. damper)
Figure 2 — Schematic of test installation (inlet measurement method)
6.3 Pressure settings

For the standard fan speed declared by the manufacturer, the following conditions shall be fulfilled:

— 0 Pa at the inlet of the unit;
— an external static pressure (ESP) of 50 Pa at the outlet of the unit;
— inside the test chamber a static pressure equal to 0 Pa.

For air flow rate measurements at other fan speeds than the standard fan speed, the following apply:

— no change in the position of the adjustable outlet duct resistance;
— 0 Pa at the inlet of the unit;

— inside the test chamber a static pressure equal to 0 Pa, so that the same network curve resistance is

used (see Figure 3).
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Key
1 ductwork load curve
2 reference standard speed
3 other speeds
X external static pressure difference (Pa)
Y flow rate

Figure 3 — Setup external static pressure difference of ducted units other speeds

6.4 Standard rating conditions

The air flow rate measurement shall be made in isothermal conditions with dry coil, at an ambient

temperature of 20 °C and at nominal voltage and frequency as specified by the manufacturer, for all fan

speeds declared by the manufacturer.
6.5 Test procedure
The fan coil shall be dry and the liquid circulation pump shall be stopped.

The ESP of 50 Pa shall refer to standard air conditions (1.2 kg/m , 20 °C at atmospheric pressure).

Depending on the atmospheric conditions of the location, the ESP shall be set as stated in Formula (1).

lab
ESP ESP× (1)
lab std
std
where

ESP is the external static pressure to be set at the atmospheric and temperature conditions of the

lab
location;
ESP is the external static pressure at standard air conditions and equals 50 Pa;
std

ρ is the air density at the atmospheric and temperature conditions of the location;

lab
ρ is the air density at standard air conditions.
std
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Test shall be performed according to ISO 5801:2017.

The fan motor shall run for at least half an hour before measuring the flow rate.

The air flow rate measurement shall be conducted under steady-state conditions, which are assumed to

be achieved when the rotational speed of the fan motor(s) does not change by more than 1 % but not less

than 10 r/min within 15 min.

All the tests shall be performed within the allowable deviations specified in Table 2.

Table 2 — Permissible deviations from set values
Permissible deviation of the Permissible deviations of
Measured quantity arithmetic mean values from time-individual measured
set values values from set values
Ambient air: dry bulb temperature ±5 K ±5 K
Voltage ±1 % ±2 %
Pressure ±1 Pa ±5 Pa
6.6 Data to be recorded

The data to be recorded for the air flow rate test are given in Table 3. The table identifies the general

information required but is not intended to limit the data to be obtained.
Table 3 — Data to be recorded
Symbol Unit
Atmospheric pressure P kPa
atm
Voltage — V
Frequency — Hz
Speed control setting of the fan speed — —
Total power input P W
elec
Rotational speed of the fan n min
Air inlet dry bulb temperature t °C
Air inlet dew point temperature t °C
Aldp
Volume flow rate of air qvA m /h
Mass flow rate of air q kg/s
External static pressure p Pa
7 Capacity rating tests
7.1 General conditions

For testing the unit shall include an air filter but no any other accessory for air inlet or diffusion or others.

Dampers for fresh air intake shall be closed.
No electric resistance heater shall be powered during the tests.
NOTE No modification such as sealing is made on the unit before testing.
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7.2 Test room

The test room shall be of sufficient volume and shall circulate air in such a manner that it does not change

the normal return air circulating pattern of the unit.

To comply with this, the air velocities at a distance of 0,5 m from the air inlet section area of the unit

under test shall not exceed 0,5 m/s when the unit is stopped.

For free delivery units, dimensions shall be such that the distance from any room surface to any surface

of the unit from which air is discharged, is not less than 1,5 m, except for units mounted under ceiling or

in false-ceiling for which the requirement in 7.3 applies.

The distance from any other room surface or any other surface of the unit shall not be less than 1 m,

except for floor, ceiling or wall relationship required for normal installation according to manufacturer’s

instructions.
7.3 Installation of the test object

The fan coil unit shall be installed in the test room in accordance with the manufacturer’s installation

using recommended installation procedures. In all cases, the manufacturer’s recommendations with

respect to distance from adjacent walls, etc. shall be followed in accordance to the requirements given

in 7.2.

Free delivery units to be mounted under ceiling or in false-ceiling shall be installed in the test room so

that the air discharge section area of the unit is at a distance between 1,8 m and 2 m from the floor.

For 1-way and 2-way cassette type fan coil units, a vertical partition plate shall separate the inlet section

from the outlet section(s) to minimize possible recirculation effect onto the air temperature

measurements, according to the description given in Annex C.

For 4-way cassette type fan coil units, a separation cone shall be used to separate the inlet section from

the outlet sections and to minimize possible recirculation effect onto the air temperature measurements,

according to the description given in Annex C.
7.4 Standard rating conditions
7.4.1 Air flow conditions
The general conditions specified
...

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