SIST EN 1397:2021

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


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
w
−1
n Rotational speed of the fan at air flow test min
1
−1
n Rotational speed of the fan at capacity test min
2
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
C
P Heating capacity W
H
P Atmospheric pressure kPa
atm
p External static pressure Pa
A
qmA Mass flow rate of air kg/s
q Mass flow rate of liquid g/s
mL
q Mass flow rate of condensate (air side) g/s
mW
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Symbol Description Unit
t Liquid inlet temperature °C
L1
t Liquid outlet temperature °C
L2
t Air inlet dry bulb temperature °C
A
t Air inlet dew point temperature °C
Adp
t Air inlet wet bulb temperature °C
Aw
Δp Liquid side pressure drop kPa
L
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.
3
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).
ρ
lab
ESP ESP× (1)
lab std
ρ
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
−1
Rotational speed of the fan n min
1
Air inlet dry bulb temperature t °C
Al
Air inlet dew point temperature t °C
Aldp
3
Volume flow rate of air qvA m /h
Mass flow rate of air q kg/s
mA
External static pressure p Pa
A
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
...