prEN 12309-1

Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW - Part 1: Terms and definitions

1.1   Scope of EN 12309
Appliances covered by this document include one or a combination of the following:
-   gas-fired sorption chiller;
-   gas-fired sorption chiller/heater;
-   gas-fired sorption heat pump;
-   hybrids based on gas sorption appliances.
This document applies to appliances designed to be used for space heating or cooling or refrigeration with or without heat recovery.
This document applies to appliances having flue gas systems of type B and C (according to EN 1749) and to appliances designed for outdoor installations. EN 12309 does not apply to air conditioners, it only applies to appliances having:
-   integral burners under the control of fully automatic burner control systems,
-   closed system refrigerant circuits in which the refrigerant does not come into direct contact with the water or air to be cooled or heated,
-   mechanical means to assist transportation of the combustion air and/or the flue gas.
The above appliances can have one or more primary or secondary functions (i.e. heat recovery).
In the case of packaged units (consisting of several parts), this standard applies only to those designed and supplied as a complete package.
The appliances having their condenser cooled by air and by the evaporation of external additional water are not covered by EN 12309.
Installations used for heating and/or cooling of industrial processes are not within the scope of EN 12309.
All the symbols given in this text are used regardless of the language used.
1.2   Scope of this Part 1 of EN 12309
This part of this document specifies the terms and definitions for gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW.

Gasbefeuerte Sorptions-Geräte für Heizung und/oder Kühlung mit einer Nennwärmebelastung nicht über 70 kW - Teil 1: Begriffe

1.1   Anwendungsbereich von EN 12309
Geräte nach diesem Dokument beinhalten eine oder eine Kombination der folgenden Funktionen:
-   gasbefeuertes Sorptionskühlgerät;
-   gasbefeuertes Sorptionskühl /heizgerät;
-   gasbefeuerte Sorptionswärmepumpe;
-   Hybridanlagen basierend auf Gassorptionsgeräten.
Dieses Dokument gilt für Geräte, die für die Nutzung zur Raumheizung oder  kühlung oder Kälteerzeugung mit oder ohne Wärmerückgewinnung ausgelegt sind.
Dieses Dokument gilt für Geräte mit Abgassystemen der Bauarten B und C (nach EN 1749) sowie für Geräte zur Aufstellung im Freien. EN 12309 gilt nicht für Klimaanlagen, sondern ausschließlich für Geräte mit:
-   integrierten Brennern, gesteuert mittels Feuerungsautomaten;
-   geschlossenen Kühlkreislaufsystemen, in denen das Kühlmittel nicht direkt mit dem zu kühlenden oder zu erwärmenden Wasser oder der zu kühlenden oder zu erwärmenden Luft in Berührung kommt;
-   mechanischen Einrichtungen zur Unterstützung der Verbrennungsluft  und/oder Abgasabführung.
Die vorstehenden Geräte können eine oder mehrere Primär  oder Sekundärfunktion(en) haben (d. h. Wärmerückgewinnung).
Bei (aus mehreren Teilen bestehenden) Verpackungseinheiten gilt diese Norm nur, wenn diese als vollstän¬dige Packung ausgelegt und geliefert werden.
EN 12309 behandelt nicht die Geräte, deren Kondensator mit Luft und durch die Verdampfung von zusätz-lichem Wasser auf der Außenseite gekühlt wird.
Anlagen für Heizung und/oder Kühlung industrieller Prozesse fallen nicht in den Anwendungsbereich von EN 12309.
Alle in diesem Text angegebenen Symbole werden unabhängig von der Sprache des Textes verwendet.
1.2   Anwendungsbereich dieses Teil 1 von EN 12309
Der vorliegende Teil dieses Dokumentes legt die Begriffe für gasbefeuerte Sorptionsgeräte für Heizung und/oder Kühlung mit einer Nennwärmebelastung nicht über 70 kW fest.

Appareils à sorption fonctionnant au gaz pour le chauffage et/ou le refroidissement de débit calorifique sur PCI inférieur ou égal à 70 kW - Partie 1 : Termes et définitions

1.1   Domaine d’application de l’EN 12309
Les appareils concernés par le présent document englobent les appareils suivants isolément ou en combinaison :
-   groupe refroidisseur à sorption fonctionnant au gaz ;
-   groupe refroidisseur réchauffeur à sorption fonctionnant au gaz ;
-   pompe à chaleur à sorption fonctionnant au gaz ;
-   appareils hybrides basés sur des appareils gaz à sorption.
Le présent document s’applique aux appareils conçus pour être utilisés pour le chauffage ou le refroidissement de locaux avec ou sans récupération de chaleur.
Le présent document s’applique aux appareils comportant des systèmes d’évacuation des gaz de combustion de types B et C (conformément à l’EN 1749) et aux appareils conçus pour les installations extérieures. L’EN 12309 ne s’applique pas aux climatiseurs, elle ne s’applique qu’aux appareils comportant :
-   des brûleurs intégrés sous le contrôle de systèmes de commande automatique ;
-   des circuits fermés de fluide frigorigène dans lesquels le fluide frigorigène n’est pas au contact de l’eau ou de l’air à refroidir ou à chauffer ;
-   des moyens mécaniques pour l’alimentation en air de combustion et/ou l’évacuation des produits de combustion.
Les appareils ci-dessus peuvent avoir une ou plusieurs fonctions principales ou additionnelles (par exemple : récupération de chaleur).
Dans le cas des appareils fournis prêts à l’emploi (constitués de plusieurs éléments), la présente norme ne s’applique qu’à ceux conçus et fournis sous forme d’ensemble complet.
L’EN 12309 ne couvre pas les appareils ayant leur condenseur refroidi par air et par évaporation d’eau d’un circuit supplémentaire externe.
L’EN 12309 ne s’applique pas aux installations utilisées pour le chauffage et/ou le refroidissement des procédés industriels.
Tous les symboles spécifiés dans le présent document sont utilisés, quelle que soit la langue utilisée.
1.2   Domaine d’application de la présente Partie 1 de l’EN 12309
La présente partie de ce document spécifie les termes et définitions pour les appareils à sorption fonctionnant au gaz pour le chauffage et/ou le refroidissement de débit calorifique sur PCI inférieur ou égal à 70 kW.

Absorpcijske in adsorpcijske plinske naprave za gretje in/ali hlajenje z grelno močjo do vključno 70 kW - 1. del: Izrazi in definicije

General Information

• Status: Not Published
• Publication Date: 26-Nov-2023
• ICS: 01.040.27 - Energy and heat transfer engineering (Vocabularies)
• ICS: 01.040.91 - Construction materials and building (Vocabularies)
• ICS: 27.080 - Heat pumps
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: CEN/TC 299 - Gas-fired sorption appliances and domestic gas-fired washing and drying appliances
• Drafting Committee: CEN/TC 299/WG 2 - Gas-fired sorption appliances
• Current Stage: 5020 - Submission to Vote - Formal Approval
• Start Date: 02-Feb-2023
• Due Date: 13-Mar-2023
• Completion Date: 02-Feb-2023
• Directive: 2016/2281 - 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
• Mandate: M/560 - [C(2019) 1725 final] Ecodesign requirements for air heating products, cooling products, high temperature process chillers and fan coils in support of Commission Regulation (EU) 2016/2281
• Ref Project: kSIST FprEN 12309-1:2023 - Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW - Part 1: Terms and definitions

Relations

• Revises: EN 12309-1:2014 - Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW - Part 1: Terms and definitions
• Effective Date: 17-May-2017

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 12309-1:2022
01-julij-2022
Absorpcijske in adsorpcijske plinske naprave za gretje in/ali hlajenje z grelno
močjo do vključno 70 kW - 1. del: Izrazi in definicije

Gas-fired sorption appliances for heating and/or cooling with a net heat input not

exceeding 70 kW - Part 1: Terms and definitions
Gasbefeuerte Sorptions-Geräte für Heizung und/oder Kühlung mit einer
Nennwärmebelastung nicht über 70 kW - Teil 1: Begriffe
Ta slovenski standard je istoveten z: prEN 12309-1
ICS:
01.040.27 Prenos energije in toplote Energy and heat transfer
(Slovarji) engineering (Vocabularies)
01.040.91 Gradbeni materiali in gradnja Construction materials and
(Slovarji) building (Vocabularies)
27.080 Toplotne črpalke Heat pumps
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
oSIST prEN 12309-1:2022 en,fr,de

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

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oSIST prEN 12309-1:2022
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oSIST prEN 12309-1:2022
DRAFT
EUROPEAN STANDARD
prEN 12309-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2022
ICS 01.040.27; 01.040.91; 27.080; 91.140.30 Will supersede EN 12309-1:2014
English Version
Gas-fired sorption appliances for heating and/or cooling
with a net heat input not exceeding 70 kW - Part 1: Terms
and definitions
Gasbefeuerte Sorptions-Geräte für Heizung und/oder
Kühlung mit einer Nennwärmebelastung nicht über 70
kW - Teil 1: Begriffe

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

CEN/TC 299.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12309-1:2022 E

worldwide for CEN national Members.
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oSIST prEN 12309-1:2022
prEN 12309-1:2022 (E)
Contents Page

European foreword ............................................................................................................................................ 3

1 Scope .......................................................................................................................................................... 4

1.1 Scope of EN 12309 ................................................................................................................................ 4

1.2 Scope of this Part 1 of EN 12309 ...................................................................................................... 4

2 Normative references .......................................................................................................................... 4

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

3.1 Appliance types ..................................................................................................................................... 5

3.2 Appliance components ........................................................................................................................ 7

3.3 Combustion products circuit .......................................................................................................... 10

3.4 Adjusting, control and safety devices .......................................................................................... 10

3.5 Operation of the appliance .............................................................................................................. 12

3.6 Gases ........................................................................................................................................................ 15

3.7 Conditions of operation, measurement and calculations .................................................... 17

Bibliography ....................................................................................................................................................... 30

Index 31
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European foreword

This document (prEN 12309-1:2022) has been prepared by Technical Committee CEN/TC 299 “Gas-fired

sorption appliances, indirect fired sorption appliances, gas-fired endothermic engine heat pumps and

domestic gas-fired washing and drying appliances”, the secretariat of which is held by UNI.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12309 1:2014.

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

EN 12309-1:2022 gathers terms and definitions from all the other parts of EN 12309. Moreover, new

terms and definitions used in the other parts have been added and existing terms and definitions have

been updated consistently to the other parts of this standard.

This document comprises the following parts under the general title, Gas-fired sorption appliances for

heating and/or cooling with a net heat input not exceeding 70 kW:
— Part 1: Terms and definitions;
— Part 2: Safety;
— Part 3: Test conditions;
— Part 4: Test methods;
— Part 5: Requirements;
— Part 6: Calculation of seasonal performances;
— Part 7: Specific provisions for hybrid appliances;
These documents will be reviewed whenever new mandates could apply.
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1 Scope
1.1 Scope of EN 12309

Appliances covered by this document include one or a combination of the following:

— gas-fired sorption chiller;
— gas-fired sorption chiller/heater;
— gas-fired sorption heat pump.

This document applies to appliances designed to be used for space heating or cooling or refrigeration

with or without heat recovery.

This document applies to appliances having flue gas systems of type B and C (according to EN 1749) and

to appliances designed for outdoor installations. EN 12309 does not apply to air conditioners, it only

applies to appliances having:
— integral burners under the control of fully automatic burner control systems,

— closed system refrigerant circuits in which the refrigerant does not come into direct contact with the

water or air to be cooled or heated,

— mechanical means to assist transportation of the combustion air and/or the flue gas.

The above appliances can have one or more primary or secondary functions (i.e. heat recovery - see

definitions in prEN 12309-1:2022).

In the case of packaged units (consisting of several parts), this standard applies only to those designed

and supplied as a complete package.

The appliances having their condenser cooled by air and by the evaporation of external additional water

are not covered by EN 12309.

Installations used for heating and/or cooling of industrial processes are not within the scope of EN 12309.

All the symbols given in this text are used regardless of the language used.
1.2 Scope of this Part 1 of EN 12309

This part of this document specifies the terms and definitions for gas-fired sorption appliances for heating

and/or cooling with a net heat input not exceeding 70 kW.
2 Normative references
There are no normative references in this document.
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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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Appliance types
3.1.1
appliance

assembly of various parts according to the installation instructions, if the appliance is supplied to the

market in multiple parts
Note 1 to entry: Accessories provided optionally are not to be included.

Note 2 to entry: Appliance may be supplied to be marketed in one or more than one part.

3.1.2
absorption
process in which molecules of the refrigerant are dissolved into a liquid
3.1.3
adsorption

process in which molecules of the refrigerant are held at the surface of a solid (possibly porous) structure

3.1.4
air-conditioners

encased assembly or assemblies designed as an appliance to provide delivery of conditioned air to an

enclosed space (room for instance) or zone

Note 1 to entry: The medium used for distribution of heating and/or cooling is exclusively air.

3.1.5
bivalent appliance

encased assembly or assemblies designed and packaged which is made up of components that can be

tested separately
3.1.6
chiller

encased assembly or assemblies designed as an appliance, whose primary function is delivery of cooling

only, and whose primary function is dependent on circulation of fluid (refrigerant and/or solution) within

the absorption, adsorption or refrigerant circuit(s)
3.1.7
chiller/heater

encased assembly or assemblies, whose primary function is delivery of cooling and/or heating and whose

primary function of cooling is dependent on circulation of fluid (refrigerant and/or solution) within the

absorption, adsorption or refrigerant circuit(s)

Note 1 to entry: The primary function of heating only uses directly or indirectly the energy delivered by the

combustion system.
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3.1.8
closed system

system in which the fluid within the refrigerant circuit (e.g. water, ammonia, etc.) providing heating or

cooling does not come into contact with the surrounding air or the heat transfer medium (e.g. water,

brine, air)
3.1.9
condensing appliance

appliance in which, under normal operating conditions and at certain operating water temperatures, the

water vapour in the combustion products is partially condensed in order to make use of the latent heat

of this water vapour for heating and/or heat recovery purposes
3.1.10
continuous appliance

appliance where the four phases of the sorption cycle (i.e. sorption-desorption-condensation-

evaporation) are processed continuously

Note 1 to entry: According to this definition, each phase of the sorption cycle is processed by a specific component.

Note 2 to entry: A continuous or non-cyclical appliance can include steady-state operation mode, transient

operation mode and on-off operation mode.
3.1.11
alternating appliance

appliance where sorption module(s) alternately process the sorption and the desorption phases leading

to a cyclical operation

Note 1 to entry: According to this definition, the phases of the sorption cycle are shifted among the internal

components of the appliance. This concept is valid at least for the sorption module.

Note 2 to entry: An alternating or cyclical appliance can include steady-state operation mode, transient operation

mode and on-off operation mode.

Note 3 to entry: the definition of alternating appliance applies to hybrid appliances with adsorption module and

adsorption appliances.
3.1.12
ductless appliance

outdoor appliance which is not designed to be fitted with external ducts to transport air to, or products

of combustion away from, the appliance’s casing
3.1.13
gas fired

appliance which mainly consumes gas for implementation of the function or functions, the electrical

power consumption being dedicated to auxiliaries needed for operation
3.1.14
heat pump

encased assembly or assemblies designed as an appliance whose primary function is delivery of heat

and/or cooling (the primary function is dependent on circulation of fluid (refrigerant and/or solution)

within the absorption, adsorption or refrigerant circuit(s))
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3.1.15
hybrid appliance

encased assembly or assemblies utilizing at least two different technologies whose primary function is to

generate heat, including overall control system that selects, according to predefined parameters, which

technology (or combination thereof) satisfies the customers' requirements while minimizing energy

costs, consumption and/or carbon emissions

Note 1 to entry: Hybrid appliances according to the scope of this standard are based on gas fired technologies.

3.1.16
monovalent appliance

encased assembly or assemblies whose primary and secondary functions are dependent on circulation of

fluid (refrigerant and/or solution) within the absorption, adsorption or refrigerant circuit(s)

3.1.17
open system

system in which the fluid within the refrigerant circuit (e.g. water, etc.) providing heating or cooling

comes into direct contact with the heat transfer medium (e.g. water, air, etc.) which is to be heated or

cooled
3.1.18
primary function
main purpose for which the sorption appliance is designed

Note 1 to entry: In the case of chiller, the main purpose is the cooling function; in the case of a heat pump this is the

heating function.
3.1.19
packaged unit

factory assembly of components of heat pump, chiller or chiller/heater fixed on a common mounting to

form a discrete unit
3.1.20
sorption

physical and chemical process by which one substance becomes attached to another, that can be

absorption or adsorption
3.1.21
sorption appliance

appliance which use the physical and chemical process by which one substance becomes attached to

another to generate heat and/or cooling

Note 1 to entry: The medium used for distribution of heating and/or cooling is liquid.

3.2 Appliance components
3.2.1
aeration adjuster

device enabling the air to be set at the desired value according to the supply conditions

3.2.2
brine
liquid that has a freezing point depressed relative to water
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3.2.3
gas circuit

part of the appliance that conveys or contains the gas between the appliance gas inlet connection and the

burner(s)
3.2.4
gas inlet connection
part of the appliance intended to be connected to the gas supply
3.2.5
gas rate adjuster

component allowing an authorized person to set the gas rate of the burner to a predetermined value

according to the supply conditions

Note 1 to entry: Adjustment may be progressive (screw adjuster) or in discrete steps (by changing restrictors).

Note 2 to entry: The adjusting screw of an adjustable pressure regulator is regarded as a rate adjuster.

3.2.6
heat recovery

energy rejected by the appliance whose primary control is in the cooling mode is collected by means of

an additional heat exchanger (e.g. a chiller with an additional condenser or absorber)

3.2.7
heat transfer medium

any medium (e.g. air, water, brine, etc.) used for the transfer of heat to or from refrigerant-containing

parts of the appliance
Note 1 to entry: The medium may be
– the cooling medium circulating in the evaporator,

– the cooling medium circulating in the condenser and/or absorber and/or flue gas heat exchanger,

– the heat recovery medium circulating in the heat recovery heat exchanger.
3.2.8
ignition burner
burner whose flame is intended to ignite another burner
3.2.9
ignition device

any means (flame, electrical ignition device or other device) used to ignite the gas at the ignition burner

or at the main burner
Note 1 to entry: This device can operate intermittently or permanently.
3.2.10
indoor heat exchanger

heat exchanger which is designed to transfer heat to the indoor part of the building or to the indoor hot

water supplies or to remove heat from these

Note 1 to entry: In the case of heat pumps operating in cooling mode, this is the evaporator. In the case of heat

pumps operating in heating mode, this is the condenser.
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3.2.11
injector
component that admits the gas into a burner
3.2.12
main burner

burner that is intended to assure the thermal function of the appliance and is generally called “the burner”

3.2.13
mechanical joint

means of assuring the soundness of an assembly of several (generally metallic) parts without the use of

liquids, pastes, tapes, etc
Note 1 to entry: The means are, for example:
— metal to metal joints;
— conical joints;
— toroidal sealing rings (“O” rings);
— flat joints.
3.2.14
outdoor heat exchanger

heat exchanger which is designed to remove heat from the outdoor ambient environment, or any other

available heat source, or to transfer heat to it

Note 1 to entry: In the case of heat pumps operating in cooling mode, this is the condenser. In the case of heat

pumps operating in heating mode, this is the evaporator.

Note 2 to entry: Both the heating and cooling functions of the sorption appliance may be classed as primary

functions if they satisfy the rational use of energy requirements for those functions.

3.2.15
out of service

procedure by which a control, adjuster or regulator (temperature, pressure, etc.) is put out of action and

sealed in this position
3.2.16
restrictor

part with an orifice, which is placed in the gas circuit so as to create a pressure drop and thus reduce the

gas pressure at the burner to a predetermined value for a given supply pressure and rate

3.2.17
sealing an adjuster

procedure by which an adjuster is set so that changing the setting of the adjuster breaks the sealing

material and makes the interference with the adjuster apparent
Note 1 to entry: A factory sealed adjuster is considered to be non-existent.

Note 2 to entry: A regulator is considered to be non-existent if it has been factory sealed in the fully opened

position.
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3.2.18
secondary function

optional function of the sorption appliance, such as heating or cooling, which is not expected to satisfy

the rational use of energy requirements of a primary function
3.2.19
setting an adjuster

procedure by which an adjuster is immobilized in a position by some means (e.g. screw)

3.3 Combustion products circuit
3.3.1
combustion chamber
enclosure inside which combustion of the air/gas mixture takes place
3.3.2
draught diverter

device placed in the combustion products circuit to reduce the influence of flue pull and prevent down

draught affecting the burner performance and combustion
3.3.3
flue outlet

part of the appliance that connects with a duct to evacuate the products of combustion

3.3.4
flue terminal

device fitted at the end of the duct system that enables the discharge of flue gases and may, at the same

time, allow entry of combustion air
3.4 Adjusting, control and safety devices
3.4.1
adjustable pressure regulator
regulator provided with means for changing the outlet pressure setting
3.4.2
automatic burner control system

system comprising at least a programming unit and all the elements of a flame detector device

3.4.3
automatic shut-off valve

device that automatically opens, closes or varies the gas rate on a signal from the control circuit and/or

the safety circuit
3.4.4
control thermostat

device controlling the operation of the appliance by on/off, high/low or modulating control and enabling

the temperature to be kept automatically, within a given tolerance, at a predetermined value

3.4.5
fan delay control

control that starts and/or stops the air delivery fan when the temperature of the delivered air reaches a

certain predetermined value
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3.4.6
flame detector device
device by which the presence of a flame is detected and signalled
3.4.7
flame signal

signal given by the flame detector device, normally when the flame sensor senses a flame

3.4.8
flame simulation

condition that occurs when the flame signal indicates the presence of a flame when in reality no flame is

present
3.4.9
flame supervision device

device that, in response to a signal from the flame detector, keeps the gas supply open and shuts it off in

the absence of the supervised flame
3.4.10
high/low control

automatic system that permits an appliance to operate either at the nominal heat input or at a fixed

reduced heat input
3.4.11
modulating control

automatic system by which the heat input of the appliance is adjusted continuously between the nominal

heat input and a minimum value
3.4.12
overheat control device

component that shuts off and locks out the gas supply before the appliance is damaged and/or before

safety is put into question, and that automatically resets
3.4.13
overheat cut-off device

component that shuts off and locks out the gas supply before the appliance is damaged and/or before

safety is put into question, and that requires manual intervention to restore the gas supply

3.4.14
pressure regulator

device that maintains the outlet pressure constant independent on the variations in inlet pressure and/or

flow rate within defined limits

Note 1 to entry: The term “regulator” is used in this case for a volume regulator.

3.4.15
program

sequence of control operations determined by the programming unit involving switching on, starting up,

supervising and switching off the burner
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oSIST prEN 12309-1:2022
prEN 12309-1:2022 (E)
3.4.16
programming unit

unit which reacts to signals from control and safety devices, gives control commands, controls the start-

up sequence, supervises the burner operation and causes controlled shut-down and, if necessary, safety

shut-down and lock-out

Note 1 to entry: The programming unit follows a predetermined sequence of actions and always operates in

conjunction with a flame detector device.
3.4.17
range rating device

component in the appliance intended to be used to adjust the heat input of the appliance, within a range

of heat inputs stated in the operating instructions, to suit the actual heat requirements of the installation

Note 1 to entry: This adjustment may be progressive (e.g. by use of a screw adjuster) or in discrete steps (e.g. by

changing restrictors).
3.4.18
spillage monitoring system

system which contains a device that automatically shuts off the gas supply to the main burner, and

perhaps the ignition burner, when there is a release of combustion products from the appliance

3.4.19
temperature sensor

component that detects the temperature of the environment to be supervised or controlled

3.5 Operation of the appliance
3.5.1
automatic burner system

process by which, when starting from the completely shut-down condition, the gas is ignited and the

flame is detected and proved without manual intervention
3.5.2
automatic recycling

process by which, following loss of flame signal during the running condition or accidental interruption

of the operation of the appliance, the gas supply is interrupted and the complete start sequence is

automatically re initiated

Note 1 to entry: This process ends with the restoration of the running condition or, if there is no flame signal at the

end of the safety time, or if the cause of the accidental interruption has not disappeared, with volatile lock out or

non-volatile lock out.
3.5.3
controlled shut-down

process by which the power to the gas shut off valve(s) is removed immediately, e.g. as a result of the

action of a controlling function
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oSIST prEN 12309-1:2022
prEN 12309-1:2022 (E)
3.5.4
cyclical operation

mode of operation leading to a cyclic shutdown of the burner due to the variation of the heating or cooling

demand

Note 1 to entry: According to this definition, a transient operation is not considered as a cyclical operation.

Note 2 to entry: A cyclical operation can include or exclude a defrost period. A non-cyclical operation can also

include a defrost period.
3.5.5
defrost mode

state of the appliance in the heating mode where the operation is modified or reversed to de-ice the

outdoor heat exchanger
3.5.6
extinction safety time

interval between extinction of the supervised flame and the gas supply being shut off:

— to the main burner;
— and/or to the ignition burner
3.5.7
first safety time

interval between the ignition burner gas valve, start gas valve or main gas valve, as applicable, being

energized and that valve being de-energized if the flame detector signals the absence of a flame at the end

of this interval
3.5.8
flame stability

characteristic of flames that remain on the burner ports or in the flame reception zone intended by the

construction
3.5.9
flame lift

total or partial lifting of the base of the flame away from the burner port or the flame reception zone

provided by the design

Note 1 to entry: Flame lift may cause the flame to blow out, i.e. extinction of the air gas mixture.

3.5.10
full load
operation state providing maximum useful capacity under given conditions
3.5.11
ignition interlock

part that prevents the operation of the igniter as long as the main gasway is open

3.5.12
ignition opening time

interval between ignition of the supervised flame and the moment when the valve is held open

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oSIST prEN 12309-1:2022
prEN 12309-1:2022 (E)
3.5.13
ignition safety time

interval between the order to open and the order to close the gas supply to the burner in the event of

ignition
3.5.14
light-back
entry of a flame into the body of the burner
3.5.15
non-volatile lock-out

safety shut-down condition of the system, such that a restart is only accomplished by a manual reset of

the system and by no other means
3.5.16
re-start interlock

mechanism which prevents the re-opening of the gasway to the main burner or the main burner and the

ignition burner until the armature plate has separated from the magnetic element
3.5.17
safety shut-down

process which is effected immediately following the response of a safety limiter or sensor or the detection

of a fault in the burner control system and which puts the burner out of operation by immediately

removing the power to the gas shut-off valve(s) and the ignition device
3.5.18
second safety time

interval between the main gas valve being energized and the main gas valve being de-energized if the

flame detector signals the absence of a flame at the end of this interval

Note 1 to entry: It occurs where there is a first safety time applicable to either an ignition burner or start gas flame

only.
3.5.19
sooting

phenomenon appearing during incomplete combustion and characterized by deposits of soot on the

surfaces or parts in contact with the combustion products or with the flame
3.5.20
spark restoration

process by which, after disappearance of the flame signal in the running condition, the ignition device is

energized again without the gas supply having been totally interrupted; this process ends with the

restoration of the running condition or, if there is no flame signal at the end of the safety time, with

volatile or non-volatile lock out
3.5.21
steady state operation

for non cyclical operation, period of operation where all measured quantities remain constant according

to allowed deviations without having to alter the set values

Note 1 to entry: For alternating appliances this could mean a wide value range to allow for the cyclic nature of the

output.
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oSIST prEN 12309-1:2022
prEN 12309-1:2022 (E)
3.5.22
transient operation

mode of operation of air to liquid (e.g. water, brine, etc.) heat pump leading to disrespect the permissible

deviation required for steady state operation due to icing of the evaporator
3.5.23
ignition flame

flame established at the ignition rate either at the main burner or at a separate ignition burner

3.5.24
volatile lock-out

safety shut down condition of the system, such that a restart is only accomplished either by the manual

reset of the system, or by an interruption of the electrical supply and its subsequent restoration

3.5.25
yellow tipping
colour change of th
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