SIST EN 50350:2005

SLOVENSKI SIST EN 50350:2005

STANDARD
marec 2005
Polnilni krmilni sistemi za kontrolo napajanja pri električnem
termoakumulacijskem ogrevanju gospodinjstev – Metode za merjenje
(delovnih) lastnosti
Charging control systems for household electric room heating of the storage type -
Methods for measuring performance
ICS 97.100.10 Referenčna številka
SIST EN 50350:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 50350
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2004

ICS 97.100.10


English version


Charging control systems
for household electric room heating of the storage type –
Methods for measuring performance


Systèmes de commande de charge  Aufladesteuerungen für elektrische
des appareils de chauffage Speicherheizungen für den Hausgebrauch -
à accumulation à usage domestique - Verfahren zur Messung
Méthodes de mesure de l'aptitude der Gebrauchseigenschaften
à la fonction



This European Standard was approved by CENELEC on 2004-04-01. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50350:2004 E

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EN 50350:2004 – 2 –
Foreword
This European Standard was prepared by the CENELEC BTWG 70-1, Charging controls for storage
heating appliances.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50350 on
2004-04-01.
The following dates were fixed:
- latest date by which the EN has to be implemented
 at national level by publication of an identical
 national standard or by endorsement (dop) 2005-04-01
- latest date by which the national standards conflicting
 with the EN have to be withdrawn (dow) 2007-04-01
__________

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– 3 – EN 50350:2004
Contents
1 Scope .4
2 Normative references .4
3 Definitions.4
4 Classification .6
5 List of measurements.7
6 General conditions for measurements .9
7 Marking and instruction .10
8 Specification of variables for the outside sensor.11
9 Central control unit (C.C.U.).12
10 Group control unit (G.C.U.) for types A, B and C.17
11 Charge controller.17
12 Performance of the charging control system of types A, B and C .19
13 Performance of charging control systems of type D .20
Annex A (informative) Information to be given by the manufacturer.26
Annex B (normative) Example of the test condition scheme for charging control systems of type D.27
Figure 1 – Combined action of components of a charging control system with/without an outside
sensor.9
Figure 2 – X .14
eW
Figure 3 – Instantaneous allowed heat content X as a function of the outside sensor's input variable
eW
X and the running time T .14
eF
Figure 4 – Characteristic curves of thermal storage room heaters .18
Figure 5 – Set characteristics of charge controller for floor storage heating.19
Figure 6 – Temperature curve as a function of time .23
Table 1 – Functional requirements for terminals.11
Table 2 – Ohmic values for a resistive sensor .12
as a function of T, weather value X and setting variables .15
Table 3 – Charging rate X
aW eF
Table 4 – Requirements of the characteristic curve adjusters. 16

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EN 50350:2004 – 4 –
1 Scope
This standard applies to charging control systems for household electric room heating (systems) of the
storage type with internal energy source (resistors).
The object of this standard is to list and define, for the information of the users, the main performance
characteristics of the charging control systems and to describe standard methods for verifying these
characteristics and to improve quality. This standard does not deal with safety requirements.
2 Normative references
The following referenced documents are indispensable for the application 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 60531 Household electric thermal storage room heaters – Methods for measuring
performance (IEC 60531, modified)
3 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
charging control system
system which consists of control and adjustment elements for the charging of storage heating units (e.g.
storage heaters)
A charging control system regulates the heat content of a storage heating unit within an allowed charging
period as a function of the climatic conditions. The assembly of all the components required to carry out
this task is called charging control system.
The individual components can have one or several functions and can consist of several elements
3.2
outside sensor
component which measures the outside climatic conditions (e.g. temperature) and transmits the
measured value as an information to other components of the charging control
3.3
central control unit
component which transmits command settings to other components as a function of information received
from sensors and as a function of the daily charge program
3.4
timer
component which determines the start time and end time of a charge within an allowed charge period
3.5
group control unit
component which amplifies the command setting of the central controller and facilitates the matching of
individual heat requirements

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– 5 – EN 50350:2004
3.6
charge controller
the charge controller of a storage heating unit (e.g. storage heater) is a component which controls the
charge as a function of the heat content and the command setting of the central controller or the group
controller. This enables each storage heating unit to be matched to the heat requirements of the
individual rooms
3.7
characteristic curve adjuster
adjustable element of a component of a charging control system which enables to modify the
characteristic curve of an output signal
3.7.1
accessible to the service engineer only
a characteristic curve adjuster is considered to be accessible only to the service engineer if the
characteristic curve adjuster requires tools for setting
3.7.2
accessible to the user
a characteristic curve adjuster is considered to be accessible to the user if the characteristic curve
adjuster can be freely set and the setting read on a scale in case of normal installation conditions of the
charging control system
3.8
charge period
period during which the storage heater is enabled to convert electrical power into heat in order to store it
in the accumulating core
3.8.1
supply charge period
longest period (in hours) of uninterrupted electrical supply to the heater
NOTE The length of this period is set and shall be published by the utility.
3.8.2
additional supply charge period
any period of uninterrupted electrical supply to the heater, additional to the supply charge period
NOTE The length and sequence of these periods are set and shall be published by the utility.
3.8.3
supplementary charge period (T – in hours)
zf
sum of additional supply charge periods in a daily charge program
3.8.4
daily charge program
sequence of charge periods (supply and additional supply periods) over a 24 h cycle, beginning with the
supply charge period
3.9
load characteristic
property of a charging control system which determines the switching-on behaviour of storage heating
units within the daily charge program. The changeover from the main load characteristic to the
supplementary load characteristic occurs at time T
4

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EN 50350:2004 – 6 –
3.9.1
forward charging
takes place when the charge switches on at the start of the supply charge period and instant of switching-
off is set by the climatic conditions and the heat content of the storage heating units
3.9.2
backward charging
takes place when instant of switching the charge on is set by the climatic conditions and by the heat
content of the storage heating units and instant of switching-off is given by the end of the supply charge
period
3.9.3
spread charging
modified form of backward charging. The instant of switching-on and switching-off are set by the climatic
conditions, the heat content of the storage heating units and a time function
4 Classification
4.1 According to the time function
Central control unit with timer.
Central control unit without timers.
4.2 According to the location of the charge controller
Located in the storage heater.
Located outside the storage heater.
4.3 According to the specification of variables
Type A: AC voltage - power based signal.
Type B: DC voltage.
Type C: AC voltage - digitised signal.
Type D: AC voltage - binary signal.

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– 7 – EN 50350:2004
5 List of measurements
5.1 Symbols, units and abbreviations used
List of symbols, units and abbreviations for the charging control system for storage heaters
Symbol Unit Designation
E1 -- Characteristic curve adjuster for full charging
E2 -- Characteristic curve adjuster for start of charge
E3 -- Characteristic curve adjuster for elapsed time at which the optimal charge is
theoretically reached
E4 -- Characteristic curve adjuster for the minimum charge base
E5 -- Global characteristic curve adjuster for a group control unit
E6 -- Characteristic curve adjuster for maximum heat content limiter
E7 --
Global characteristic curve adjuster for charging within the main load characteristic
(floor storage heating)
E8 -- Global characteristic curve adjuster for charging within the supplementary load
characteristic (floor storage heating)
E10 -- Characteristic curve adjuster for the supplementary load characteristic
E11 -- Length of the period during which, if an interruption of the supply charge period
appears, the timer of charge controller is stopped up to the end of this interruption
E12 -- End point of the main load characteristic i.e. switching over point to the
supplementary charging characteristic
E13 -- Length of the cycle during which the clock of the charge control system is running
E14 -- Characteristic curve adjuster for the total charging period limiter (floor storage
heating)
E15 -- Characteristic curve adjuster for the level of charge allowed by E2
E16 -- Additional curve adjuster for restriction of supplementary load characteristic
depending on the adjustment of E1
X °C Setting point for E1
E1
X °C Setting point for E2
E2
X h Setting point for E3
E3
X % Setting point for E4
E4
X % Setting point for E5
E5
XE6 % Setting point for E6
X % Setting point for E7
E7
X % Setting point for E8
E8
X % Setting point for E10
E10
X h Setting point for E11
E11
X h Setting point for E12
E12
X h Setting point for E13
E13
X h Setting point for E14 (floor storage heating)
E14
X % Setting point for E15
E15
X 0/1 Setting point for E16
E16
T h Length of supply charge period
f

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EN 50350:2004 – 8 –
Symbol Unit Designation
T h Length of supplementary charge period
zf
T h Elapsed time since the beginning of the last supply charge (running time)

T h Starting point of the load-characteristic
0
T h Length of the period during which, if an interruption of the supply charge period
1
appears, the timer of charge controller is stopped up to the end of this interruption
T h Elapsed time at which the optimal charge is theoretically reached
3
T h End point of the main load characteristic i.e. switching over point to the
4
supplementary charging characteristic
T h The end of the cycle during which the clock of the charge control system is running
5
T s Length of period switched-off
off
T s Length of period switched-on
on
n Number of switched-on supply periods within T (control cycle)
n Maximum number of supply periods within T (control cycle)
max
U V Supply voltage
I A Value of electric current
P kW Rated input of storage heating unit
N
O °C Outside temperature
a
O °C Ambient temperature
u
X °C Input value of outside sensor
eF
X * Output variable of outside sensor
aF
X * Output variable of ambient temperature sensor
uF
X * Input variable of central control unit for outside condition
e1
X * Input variable for running control of the timer in accordance with the tariff-situation
e2
X % Input variable of group control unit
e3
Xe4 % Input variable of charge controller
X % Input variable of heat content measurement of an appliance
e5
X % Output variable of central control unit
a1
X % Output variable of group control unit
a3
X -- Binary output control signal to switch the charge
a4
X % Output variable of heat content measurement of an appliance
aW
X % Instantaneous allowed heat content calculated by the central control unit (set
eW
charging rate)
U V Output voltage of central control unit
a1
N -- Number of connectable charge controllers
a1
N -- Number of connectable group control units
a3
Z Output impedance of central control unit
a1 kΩ
Z Output impedance of group control unit
a3 kΩ
Z Input impedance of group control unit
e3 kΩ
Z Input impedance of charge controller
e4 kΩ
* Shall be defined by the manufacturer.

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– 9 – EN 50350:2004
5.2 List of test and measurements
− X (test has to be made in accordance to Clause 9).
a1
− Performance of the charging control system (test has to be made in accordance to Clause 12).
− Performance of type D (test has to be made in accordance to Clause 13).
6 General conditions for measurements
6.1 Power supply
If the central control unit requires a main power supply, this shall perform normally for a supply voltage of
AC 230 V + 10 % - 15 % at 50 Hz.
During tests the supply voltage has to be 230 V AC ± 1 %.
6.2 Configuration
The configuration of the charging control system shall be in accordance with this given by the manufacturer.
Examples showing the combined action of components of different charging control systems are given in
Figure 1a and Figure 1b.
X X X
E4 E11 E13
X X X X
E3 E10 E12 E14
An example showing the combined action of
components of a charging control system
X
ef
X
e2
TIMER
P
N
X
e5
X
eF
X X X
CENTRAL e3 a4 aW
X
X a3
GROUP CHARGE STORAGE
a1
CONTROL UNIT
CONTROL UNIT CONTROLLER CORE
X
e1
X
e4
X X X X X
E1 E2 E15 E5 ef

Figure 1a – Combined action of components of a charging control system
with an outside sensor
X
aW
Tariff signal Heat content
CENTRAL CHARGE STORAGE
X
e2
CONTROL UNIT CONTROLLER CORE
Room
temperature
sensor     *
X X X X
uF a1 eW aW

Figure 1b – Combined action of components of a charging control system
without an outside sensor

OUTSIDE SENSOR

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EN 50350:2004 – 10 –
6.3 Mounting
Unless otherwise specified, the mounting, wiring and configuration of the charging control system shall be
in accordance with the manufacturer instruction.
As far as it is planned for installation into an electric distribution board, the central control unit shall be
pluggable into a clearly allocated and firmly installable socket. These units shall be suitable for assembly
on rails.
7 Marking and instruction
To achieve the tests, the charging control system manufacturer shall provide to the test laboratory, the
following information : adjustments of the charging control system parameters for each test, needed
inputs (core temperature, ambient temperature, tariff signal, …), characteristic curves of the different
probes.
7.1 Information to be given by the manufacturer
The manufacturer shall provide information for
− buying and sizing,
− installation and servicing,
− use and cleaning.
Details shall be available on the position, accessibility and effect of the settings adjusters and wiring
possibilities. The display of operational conditions shall be explained.
The information to be given by the manufacturer is listed in Annex A.
7.2 Markings
For all characteristic curve adjusters and terminal markings the marking shall be
− either in accordance with the symbols listed under 5.1 or 7.5,
− or a symbol not listed under 5.1. In this case, the manufacturer shall give the corresponding standard
symbol in the documentation.
As an adjusting device is allocated to a characteristic curve adjuster, it shall be marked with the
corresponding setting range with numerical values and the associated unit.
The type designation shall be marked on the front panel of each unit.
7.3 Construction and dimensions
The manufacturer shall declare the dimensions of each component of the charging control system.

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– 11 – EN 50350:2004
7.4 Displaying on the appliance
For types A, B and C, the following information shall be displayed on the appliance with timer, if a digital
display is available:
− values of the setting point of the standardised adjusters;
− set charging rate;
− running time;
− sensor interrupting;
− X – signal;
a1
− time signal is running;
− sensor short-circuit;
− outside temperature;
− charge.
7.5 Functional requirements
See Table 1.
Table 1 – Functional requirements for terminals
Marking Terminal Function Functional description Explanation
LF Terminal F Supply charge period Usually principal charge of load during the supply
charge period
LZ Terminal F Additional supply charge Additional supply charge period during the
period course of the day
LL Terminal F Start of timer Only starting signal of characteristic curve
(Usually separation from ”LF” must be effected)
VR F Switch-off time influence
With the simultaneous activation of LF and LZ or
available terminal VR, the time
...