prEN 12098-1

Energy performance of buildings - Controls for heating systems - Part 1: Control equipment for hot water heating systems - Modules M3-5, 6, 7, 8

This document applies to electronic control equipment for heating systems with water as the heating medium and a supply water temperature up to 120 °C.
This control equipment controls the distribution and/or the generation of heat in relation to the outside temperature and time and other reference variables.
This document covers also controllers that contain an integrated optimum start or an optimum start-stop control function.
Safety requirements on heating systems remain unaffected by this document.
The dynamic behaviour of the valves and actuators are not covered in this document.
A multi-distribution and/or multi-generation system needs a coordinated solution to prevent undesired interaction and is not part of this document.
Table 1 shows the relative position of this document within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000 1.
NOTE 1   In CEN ISO/TR 52000 2 the same table can be found, with, for each module, the numbers of the relevant EPB standards and accompanying Technical Reports that are published or in preparation.
NOTE 2   The modules represent EPB standards, although one EPB standard can cover more than one module and one module can be covered by more than one EPB standard, for instance a simplified and a detailed method, respectively.

Engergieeffizienz von Gebäuden - Mess-, Steuer- und Regeleinrichtungen für Heizungen - Teil 1: Regeleinrichtungen für Warmwasserheizungen - Module M3-5, 6, 7, 8

Dieses Dokument gilt für elektronische Regeleinrichtungen für Heizungsanlagen mit Wasser als Wärme-träger und einer Vorlauftemperatur bis 120 °C.
Diese Regeleinrichtungen dienen der Steuerung der Wärmeverteilung und/oder  erzeugung in Abhängigkeit von der Außentemperatur, der Zeit und anderen Führungsgrößen.
Dieses Dokument behandelt auch Regeleinrichtungen mit integrierter Einschalt-Optimierungsfunktion oder Ein-/Ausschalt-Optimierungsfunktion.
Sicherheitstechnische Anforderungen an Heizungsanlagen bleiben von diesem Dokument unberührt.
Das dynamische Verhalten von Ventilen und Stellgliedern wird in diesem Dokument nicht behandelt.
Eine Anlage mit mehreren Verteilkreisen und/oder Erzeugern erfordert eine koordinierte Lösung, um unerwünschte Wechselwirkungen zu vermeiden, und ist nicht Gegenstand dieses Dokuments.
Tabelle 1 zeigt die relative Position dieses Dokuments innerhalb des EPB Normenpaketes im Kontext der in EN ISO 52000 1 dargelegten modularen Struktur.
ANMERKUNG 1   In CEN ISO/TR 52000 2 findet sich die gleiche Tabelle mit den Nummern (für jedes Modul) der jeweiligen EPB Normen und den begleitenden Technischen Berichten, die bereits veröffentlicht wurden oder sich in Vorbereitung befinden.
ANMERKUNG 2   Die Module repräsentieren EPB Normen, auch wenn eine EPB Norm mehr als ein Modul abdecken kann und ein Modul von mehr als einer EPB Norm abgedeckt werden kann, zum Beispiel jeweils ein vereinfachtes und ein detailliertes Verfahren.

Performance énergétique des bâtiments - Régulation pour les systèmes de chauffage - Partie 1 : Equipement de régulation pour les systèmes de chauffage à eau chaude - Modules M3-5, 6, 7, 8

Le présent document s’applique aux dispositifs électroniques de régulation pour les systèmes de chauffage qui utilisent l’eau comme fluide caloporteur, avec une température de l’eau allant jusqu’à 120 °C.
Ces dispositifs de régulation servent à la commande et à la régulation de la distribution et/ou de la production de chaleur en fonction de la température extérieure et du temps, ainsi que d’autres variables de référence.
Le présent document couvre également les régulateurs contenant une fonction intégrée de commande de démarrage optimisé ou de démarrage-arrêt optimisé.
Les exigences de sécurité relatives aux systèmes de chauffage ne sont pas affectées par le présent document.
Le comportement dynamique des vannes et des actionneurs n’est pas couvert par le présent document.
Un système multidistribution et/ou multiproduction nécessite une solution coordonnée pour empêcher toute interaction indésirable, mais un tel système ne relève pas du domaine d’application du présent document.
Le Tableau 1 présente la position du présent document dans l’ensemble des normes PEB et dans le contexte de la structure modulaire comme décrit dans l’EN ISO 52000 1.
NOTE 1   Le même tableau se trouve dans le CEN ISO/TR 52000 2 avec, pour chaque module, le numéro des normes PEB et des Rapports techniques (TR) qui les accompagnent, publiés ou en préparation.
NOTE 2   Les modules représentent les normes PEB, bien qu’une norme puisse couvrir plus qu’un module et qu’un module puisse être couvert par plus qu’une norme PEB, par exemple une méthode simplifiée et une détaillée.

Energijske lastnosti stavb - Naprave za regulacijo sistemov za ogrevanje - 1. del: Naprave za regulacijo toplovodnih sistemov za ogrevanje - Moduli M3-5, 6, 7, 8

General Information

• Status: Not Published
• ICS: 91.140.10 - Central heating systems
• ICS: 97.120 - Automatic controls for household use
• Technical Committee: CEN/TC 247 - Controls for mechanical building services
• Drafting Committee: CEN/TC 247/WG 6 - Electronic control equipment for HVAC applications, integrated room automation, controls and management systems
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 15-Apr-2022
• Completion Date: 15-Apr-2022
• Directive: 2010/31/EU - Directive 2010/31/eu of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast)
• Mandate: M/480 - Mandate to CEN, CENELEC and ETSI for the elaboration and adoption of standards for a methodology calculating the integrated energy performance of buildings and promoting the energy efficiency of buildings, in accordance with the terms set in the recast of the Directive on the energy performance buildings (2010/31/EU)
• Ref Project: oSIST prEN 12098-1:2021 - Energy Performance of Buildings - Controls for heating systems - Part 1: Control equipment for hot water heating systems - Modules M3-5, 6, 7, 8

RELATIONS

• Revised: EN 12098-5:2017 - Energy Performance of Buildings - Controls for heating systems - Part 5: Start-stop schedulers for heating systems - Modules M3-5,6,7,8
• Effective Date: 22-Jul-2020
• Revised: EN 12098-1:2017 - Energy Performance of Buildings - Controls for heating systems - Part 1: Control equipment for hot water heating systems - Modules M3-5, 6, 7, 8
• Effective Date: 22-Jul-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 12098-1:2021
01-september-2021

Energijske lastnosti stavb - Naprave za regulacijo sistemov za ogrevanje - 1. del:

Naprave za regulacijo toplovodnih sistemov za ogrevanje - Moduli M3-5, 6, 7, 8
Energy Performance of Buildings - Controls for heating systems - Part 1: Control
equipment for hot water heating systems - Modules M3-5, 6, 7, 8

Engergieeffizienz von Gebäuden - Mess-, Steuer- und Regeleinrichtungen für Heizungen

- Teil 1: Regeleinrichtungen für Warmwasserheizungen - Module M3-5, 6, 7, 8

Performance énergétique des bâtiments - Régulation pour les systèmes de chauffage -

Partie 1 : Equipement de régulation pour les systèmes de chauffage à eau chaude -

Modules M3-5, 6, 7, 8
Ta slovenski standard je istoveten z: prEN 12098-1
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
oSIST prEN 12098-1:2021 en,fr,de

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

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oSIST prEN 12098-1:2021
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oSIST prEN 12098-1:2021
DRAFT
EUROPEAN STANDARD
prEN 12098-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS 91.140.10; 97.120 Will supersede EN 12098-1:2017, EN 12098-5:2017
English Version
Energy performance of buildings - Controls for heating
systems - Part 1: Control equipment for hot water heating
systems - Modules M3-5, 6, 7, 8

Performance énergétique des bâtiments - Régulation Engergieeffizienz von Gebäuden - Mess-, Steuer- und

pour les systèmes de chauffage - Partie 1 : Equipement Regeleinrichtungen für Heizungen - Teil 1:

de régulation pour les systèmes de chauffage à eau Regeleinrichtungen für Warmwasserheizungen -

chaude - Modules M3-5, 6, 7, 8 Module M3-5, 6, 7, 8

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

CEN/TC 247.

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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12098-1:2021 E

worldwide for CEN national Members.
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 8

3 Terms and definitions ................................................................................................................................... 8

4 Symbols, subscripts and abbreviations................................................................................................ 15

4.1 Symbols ............................................................................................................................................................ 15

4.2 Subscripts ........................................................................................................................................................ 15

5 Functionality .................................................................................................................................................. 15

5.1 Functional objective .................................................................................................................................... 15

5.2 Control equipment functionality ............................................................................................................ 16

6 Requirements ................................................................................................................................................ 17

6.1 Data retention ............................................................................................................................................... 17

6.2 Characteristic heating curve .................................................................................................................... 17

6.3 Input signal – Sensors ................................................................................................................................. 18

6.4 Controller operation modes ..................................................................................................................... 18

6.4.1 General ............................................................................................................................................................. 18

6.4.2 Comfort operation mode ........................................................................................................................... 18

6.4.3 Economy operation mode ......................................................................................................................... 18

6.4.4 Building protection operation mode .................................................................................................... 19

6.4.5 Automatic operation mode ....................................................................................................................... 19

6.5 Frost protection ............................................................................................................................................ 19

6.6 Additional functions .................................................................................................................................... 19

6.6.1 General ............................................................................................................................................................. 19

6.6.2 Summer/winter switch function ............................................................................................................ 19

6.6.3 Set back function .......................................................................................................................................... 19

6.6.4 Optimum start function ............................................................................................................................. 20

6.6.5 Optimum stop function .............................................................................................................................. 20

6.7 Switching times ............................................................................................................................................. 20

6.8 Manual Operation Mode (MOM) ............................................................................................................. 20

6.9 Parameter settings ...................................................................................................................................... 21

6.10 Factory settings/Default values .............................................................................................................. 21

6.10.1 Characteristic heating curve .................................................................................................................... 21

6.10.2 Switching times/Operating condition .................................................................................................. 21

6.11 Switching relays ............................................................................................................................................ 21

6.12 Electrical requirements ............................................................................................................................. 21

6.12.1 Electrical connections ................................................................................................................................ 21

6.12.2 Supply voltage ............................................................................................................................................... 21

6.12.3 Electrical safety ............................................................................................................................................. 21

6.12.4 Electro-magnetic compatibility .............................................................................................................. 22

6.13 Degree of protection ................................................................................................................................... 22

6.14 Environmentally induced stress due to temperature ..................................................................... 22

6.15 Materials .......................................................................................................................................................... 22

6.16 Use of graphical symbols ........................................................................................................................... 22

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7 Test methods .................................................................................................................................................. 22

7.1 Data retention ................................................................................................................................................ 22

7.2 Controller operation modes ..................................................................................................................... 22

7.3 Controller characteristic heating curve ............................................................................................... 22

7.4 Frost protection............................................................................................................................................. 28

7.5 Switching times ............................................................................................................................................. 28

7.6 Manual Operation Mode ............................................................................................................................. 28

7.7 Optimum start-stop function .................................................................................................................... 28

7.7.1 General ............................................................................................................................................................. 28

7.7.2 Test conditions .............................................................................................................................................. 30

7.7.3 Test run ............................................................................................................................................................ 30

7.7.4 Test results start optimization ................................................................................................................ 30

7.8 Test results stop optimization ................................................................................................................. 32

7.9 Summer/winter switch............................................................................................................................... 33

7.10 Set back ............................................................................................................................................................ 33

7.11 Parameter settings ....................................................................................................................................... 33

7.12 Factory settings ............................................................................................................................................. 33

7.13 Switching relays ............................................................................................................................................ 33

7.14 Electrical test .................................................................................................................................................. 33

7.15 Degrees of protection .................................................................................................................................. 33

7.16 Environmental individual stress due to temperature..................................................................... 33

8 Marking ............................................................................................................................................................ 34

9 Documentation .............................................................................................................................................. 34

9.1 Technical documents................................................................................................................................... 34

9.2 Technical specifications ............................................................................................................................. 34

9.2.1 Controller ........................................................................................................................................................ 34

9.2.2 Output signals ................................................................................................................................................ 35

9.2.3 Input signals (sensors) ............................................................................................................................... 35

9.3 Instruction installation ............................................................................................................................... 35

9.4 User guideline ................................................................................................................................................ 35

Bibliography ................................................................................................................................................................. 36

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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
European foreword

This document (prEN 12098-1:2021) has been prepared by Technical Committee CEN/TC 247 “Building

Automation, Controls and Building Management”, the secretariat of which is held by SNV.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12098-1:2017 and EN 12098-5:2017.

In comparison with the previous edition, the following technical modifications have been made:

— respecting the presentation of this project in the frame of EPB in accordance with the drafting rules;

— Clause 6.7 “Switching times” and Table 2 introducing networked clocks improvements in line with

EN 12098-5 modifications have been updated. Consequently, EN 12098-5 becomes obsolete.

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

Commission and the European Free Trade Association.

This document is part of the set of standards on the energy performance of buildings (the set of EPB

standards).

In case this document is used in the context of national or regional legal requirements, mandatory choices

could be given at national or regional level for such specific applications, in particular for the application

within the context of EU Directives transposed into national legal requirements.

Further target groups are users of the voluntary common European Union certification scheme for the

energy performance of non-residential buildings (EPBD art. 11.9) and any other regional (e.g. Pan

European) parties wanting to motivate their assumptions by classifying the building energy performance

for a dedicated building stock.
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
Introduction

This document is part of a series of standards aiming at international harmonization of the methodology

for the assessment of the energy performance of buildings, called the “EPB set of standards”.

As part of the “EPB set of standards” it complies with the requirements for the set of basic EPB documents

EN ISO 52000-1 (see Clause 2), CEN/TS 16628 and CEN/TS 16629 (see [2] and [3]) developed under a

mandate given to CEN by the European Commission and the European Free Trade Association (M/480

[11]).

The standards issued by TC 247 for M/480 belong to the EPB set of standards and are in line with the

over-arching standard (EN ISO 52000-1) and drafted in accordance with the basic principles and detailed

technical rules developed in the Phase I of the mandate.

Also these standards are clearly identified in the modular structure developed to ensure a transparent

and coherent EPB standard set. BAC (Building Automation and Control) is identified in the modular

structure as Technical Building System M10. However, the standards of TC 247 deal with control

accuracy, control functions and control strategies using standards communications protocol (these last

standards do not belong to the EPB standards set).

To avoid a duplication of calculation due to the BAC (avoid double impact), no calculations are done in

the BAC EPB standard set, but in each underlying standard of the EPB set of standards (from M1 to M9 in

the Modular Structure), an IDENTIFIER developed and present in the M10 covered by

is used where appropriate. This way of interaction is described in detail in the

EN ISO 52120-1:—

Technical Report (CEN ISO/TR 52000-2) accompanying the over-arching standard. As a consequence, the

Annex A and Annex B concept as EXCEL sheet with the calculation formulas used in the EPB standards

are not applicable for the standards issued by TC 247 for M/480.

The main target groups of this document are all the users of the set of EPB standards (e.g. architects,

engineers, regulators).

Further target groups are parties wanting to motivate their assumptions by classifying the building

energy performance for a dedicated building stock.
More information is provided in the Technical Report accompanying this document
(CEN/TR 12098-6:— , [5]).
Under preparation. Stage at the time of publication: prEN ISO 52120-1:2020.
Under preparation. Stage at the time of publication: prCEN/TR 12098-6:2021.
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
1 Scope

This document applies to electronic control equipment for heating systems with water as the heating

medium and a supply water temperature up to 120 °C.

This control equipment controls the distribution and/or the generation of heat in relation to the outside

temperature and time and other reference variables.

This document covers also controllers that contain an integrated optimum start or an optimum start-stop

control function.
Safety requirements on heating systems remain unaffected by this document.

The dynamic behaviour of the valves and actuators are not covered in this document.

A multi-distribution and/or multi-generation system needs a coordinated solution to prevent undesired

interaction and is not part of this document.

Table 1 shows the relative position of this document within the set of EPB standards in the context of the

modular structure as set out in EN ISO 52000-1.

NOTE 1 In CEN ISO/TR 52000-2 the same table can be found, with, for each module, the numbers of the relevant

EPB standards and accompanying Technical Reports that are published or in preparation.

NOTE 2 The modules represent EPB standards, although one EPB standard can cover more than one module and

one module can be covered by more than one EPB standard, for instance a simplified and a detailed method,

respectively.
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)

Table 1 — Position of this document (in casu M3–5, 6, 7, 8), within the modular structure of the

set of EPB standards
Over-arching Building Technical Building System
(as such)
sub1 M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11
1 General General General
Common terms
and definitions; Building Energy
2 Needs
symbols, units Needs
and subscripts
(Free) Indoor
Maximum
Conditions
3 Application Load and
without
Power
Systems
Ways to
Ways to Express Ways to Express
Express
4 Energy Energy
Energy
Performance Performance
Performance
Building
Heat Transfer
Functions and Emission and
5 by x
Building control
Transmission
Boundaries
Building
Heat Transfer
Occupancy and Distribution
6 by Infiltration x
Operating
and control
and Ventilation
Conditions
Aggregation of
Energy Services
Internal Heat Storage and
7 x
and Energy Gains control
Carriers
Building Generation
8 Solar Heat Gains x
Partitioning and control
Load
Calculated Building
dispatching
9 Energy Dynamics
and operating
Performance (thermal mass)
conditions
Measured Measured
Measured Energy
10 Energy Energy
Performance
Performance Performance
11 Inspection Inspection Inspection
Ways to Express
12 BMS
Indoor Comfort
External
13 Environment
Conditions
Economic
Calculation
The shaded modules are not applicable.
Submodule
Descriptions
Descriptions
Descriptions
Heating
Cooling
Ventilation
Humidification
Dehumidification
Domestic Hot waters
Lighting
Building automation
and control
PV, wind, ..
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
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 dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
EN 60038, CENELEC standard voltages (IEC 60038)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)

EN 60730-1, Automatic electrical controls for household and similar use - Part 1: General requirements

(IEC 60730-1)

EN ISO 7345, Thermal performance of buildings and building components - Physical quantities and

definitions (ISO 7345)

EN ISO 52000-1:2017, Energy performance of buildings - Overarching EPB assessment - Part 1: General

framework and procedures (ISO 52000-1:2017)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 7345 and

EN ISO 52000-1:2017 and the following apply.
3.1
outside temperature compensated controller
OTC controller

controller optimizing and regulating the generation and/or distribution of heat in relation to the outside

temperature, time and other reference variables

Note 1 to entry: The outside temperature compensated function calculates the flow (supply) temperature in

relation to the outside temperature, based on the heating curve.

Note 2 to entry: The outside temperature optimum start-stop function calculates the pre-heat time and/or stop

time to reach the comfort temperature level in relation with the outside temperature, switch time and several

parameters (e.g. room temperature).
3.2
control equipment

equipment which consists of the OTC controller, and connectors for sensor input signals and output

signals, but does not include the sensors and actuating equipment
Note 1 to entry: See Figure 1.
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
Key
1 OTC
2 output signals
3 input signals: reference variables
4 input signal: controlled variable
5 actuating equipment
6 heat generation or distribution
Figure 1 — Control equipment for heating systems
3.3
actuating equipment
equipment by which the controller affects the controlled variable
3.4
controlled variable

supply water temperature and/or boiler water temperature as a result of the heating curve in accordance

to the reference variables
Note 1 to entry: The controlled variable is an input signal.
3.5
output signal
signal generated by the OTC controller for operating the actuating equipment
3.6
reference variable

outside temperature with or without other influences or variables (e.g. room temperature) used to

determine the setpoint of the controlled variable
Note 1 to entry: The controlled variable is an input signal.
3.7
outside temperature

reference variable that is measured with a sensor fitted outside the building, mainly intended to measure

the ambient air temperature
3.8
room temperature

resulting temperature in the building arising in comfort, economy or building protection operation mode

of the OTC controller
Note 1 to entry: Room temperature can be different for individual rooms.
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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
3.9
characteristic heating curve

relation between the setpoint value of the controlled variable (e.g. supply water temperature) and the

reference variables (outside air temperature) defined by two or more parameters and depending on

operation mode and additional variables

Note 1 to entry: The setpoint of supply water temperature is a function of the outside temperature and the

present room temperature setpoint. The setpoint of supply water temperature as function of the outside

temperature is graphically represented by the heating curve.
3.10
comfort operation mode

mode of operation between the switch-on time and the switch-off time, maintaining comfort room

temperature
Note 1 to entry: Mode of operation for normally occupied rooms.
3.11
economy operation mode

mode of operation between the switch-off time and the switch-on time, maintaining a reduced room

temperature compared to the comfort room temperature
Note 1 to entry: Economy operation mode is a reduced mode.
3.12
building protection operation mode

mode of operation between the switch-off time and the switch-on time, maintaining a room temperature

required for building protection
Note 1 to entry: Building protection operation mode is a reduced mode.
3.13
automatic operation mode

mode of operation of equipment when significant control functions are not overridden by the user

Note 1 to entry: The operation mode is selected automatically according to the scheduler, actual date and time.

3.14
summer/winter switch function

seasonal switch on/off of the heating depending on a function of the outside air temperature

3.15
set back function

function, starting when the operation mode changes from comfort to economy or building protection

mode

Note 1 to entry: During set back period, the heating is switched off until the calculated or measured room

temperature drops below the economy or building protection setpoint; the operation mode switches back to

comfort mode or the calculated switch-on time of the optimization start function is reached.

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oSIST prEN 12098-1:2021
prEN 12098-1:2021 (E)
3.16
optimum start function

function, calculating the optimum pre-heat time to reach the comfort temperature level at the beginning

of the comfort occupation period
Note 1 to entry: See Figure 2.

Note 2 to entry: The optimum start functions and the optimum stop functions are illustrated by Figure 3. Heating

periods are different from scheduled occupation periods. These differences, due to thermal inertia, depend mainly

on heating loads (or temperature differences). A start and/or stop optimizer controls these switching points,

...