SIST EN 12098-2:2002
(Main)Controls for heating systems - Part 2: Optimum start-stop control equipment for hot water heating systems
Controls for heating systems - Part 2: Optimum start-stop control equipment for hot water heating systems
This standard applies to electronic equipment which controls heating systems with water as the heating medium and a flow temperature up to 120 °C. The signals can be processed by using either analogue or digital techniques, or both. The particular equipment to which this standard applies covers both :
· stand-alone start optimisers or start-stop optimisers, taking priority to the main controller during periods.
· controllers which contain an integrated optimum start or an optimum start-stop control function.
It applies both to adaptive and fixed parameters control functions and sets minimum acceptable standards for functions, performance and documentation.
NOTE The optimum start-stop function can be integrated within a main control device such as an outside temperature compensated (OTC) controller. In this case the controller would be expected to meet both Part 1 and Part 2 of this standard (see EN 12098-1:1996).
Safety requirements on heating systems and heating control systems remain unaffected by this standard. The actuators and the dynamic behaviour of the valves are not covered in this standard.
This control equipment may or may not be connected to a data network.
Mess-, Steuer- und Regeleinrichtungen für Heizungen - Teil 2: Ein-/Ausschalt-Optimierer für Warmwasserheizungen
1 Anwendungsbereich
Diese Europäische Norm gilt für elektronische Mess-, Steuer- und Regeleinrichtungen für Heizungsanlagen
mit Wasser als Wärmeträger mit einer Vorlauftemperatur bis 120 °C. Die Signale können sowohl in Analog- als
auch in Digitaltechnik oder in beiden verarbeitet werden. Diese Norm gilt für spezielle MSR-Einrichtungen, die
entweder
- separate Geräte als Einschalt-Optimierer oder Ein-/Ausschalt-Optimierer und gegenüber dem Hauptregler
Priorität haben, oder
- Regler mit integriertem Einschalt-Optimierer oder Ein-/Ausschalt-Optimierer sind.
Sie gilt für adaptive Regler als auch für Regler mit festen Parametern, und sie legt Anforderungen für die Funk-tionen,
die Ausführung und die Dokumentation fest.
ANMERKUNG Die optimale Ein-/Ausschalt-Funktion kann in eine Hauptregeleinrichtung, wie z. B. einem witterungs-geführten
Regler, integriert sein. Dann wird erwartet, dass der Regler sowohl Teil 1 als auch Teil 2 der Reihe entspricht
(siehe EN 12098-1:1996).
Sicherheitstechnische Anforderungen an Heizungsanlagen und Regeleinrichtungen für Heizungsanlagen bleiben
von dieser Norm unberührt.
Stellglieder und das dynamische Verhalten von Ventilen werden in dieser Norm nicht behandelt.
Diese MSR-Einrichtung kann so ausgeführt sein, dass sie an ein Datennetz anschließbar ist.
Régulation pour les systemes de chauffage - Partie 2: Optimiseurs d'intermittences pour les systemes de chauffage a eau chaude
Domaine d'application
La présente norme s'applique aux équipements électroniques de régulation pour les systemes de chauffage utilisant l'eau comme caloporteur et dont la température de départ est inférieure a 120 °C.
Les signaux peuvent etre traités par des techniques analogiques, ou numériques, ou les deux.
Les équipements concernés par la présente norme sont :
3 les optimiseurs d'intermittences autonomes ;
3 les régulateurs qui integrent des fonctions d'optimisation des intermittences.
La norme s'applique aux équipements auto-adaptatifs ou non, elle définit des niveaux minimaux admissibles pour les fonctions, les caractéristiques et la documentation.
NOTE La fonction d'optimisation peut etre intégrée a un dispositif de régulation centralisée comme par exemple, un régulateur en fonction de la température extérieure. Dans ce cas, il est recommandé que le régulateur soit conforme aux parties 1 et 2 de la présente norme (voir l'EN 12098-1:1996).
Les impératifs de sécurité concernant les systemes de chauffage et de régulation du chauffage ne sont pas affectés par la présente norme. Les actionneurs et le comportement dynamique des vannes ne sont pas traités dans la présente norme.
L'équipement peut etre raccordé a un réseau de transmission de données ou non.
Regulacijske naprave za sisteme ogrevanja - 2. del: Naprave za optimizacijo delovanja toplovodnih ogrevalnih sistemov na osnovi vklop-izklop
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Regulacijske naprave za sisteme ogrevanja - 2. del: Naprave za optimizacijo delovanja toplovodnih ogrevalnih sistemov na osnovi vklop-izklopMess-, Steuer- und Regeleinrichtungen für Heizungen - Teil 2: Ein-/Ausschalt-Optimierer für WarmwasserheizungenRégulation pour les systemes de chauffage - Partie 2: Optimiseurs d'intermittences pour les systemes de chauffage a eau chaudeControls for heating systems - Part 2: Optimum start-stop control equipment for hot water heating systems97.120Avtomatske krmilne naprave za domAutomatic controls for household use91.140.10Sistemi centralnega ogrevanjaCentral heating systemsICS:Ta slovenski standard je istoveten z:EN 12098-2:2001SIST EN 12098-2:2002en01-junij-2002SIST EN 12098-2:2002SLOVENSKI
STANDARD
SIST EN 12098-2:2002
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12098-2April 2001ICS 91.140.10; 97.120English versionControls for heating systems - Part 2: Optimum start-stop controlequipment for hot water heating systemsRégulation pour les systèmes de chauffage - Partie 2:Optimiseurs d'intermittences pour les systèmes dechauffage à eau chaudeMeß-, Steuer- und Regeleinrichtungen für Heizungen - Teil2: Ein-/Ausschalt-Optimierer für WarmwasserheizungenThis European Standard was approved by CEN on 12 March 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12098-2:2001 ESIST EN 12098-2:2002
Page 2EN 12098-2:2001ContentsForeword.3Introduction.41Scope.52Normative references.53Terms and definitions.64Functionality.105Graphical symbols and abbreviations.156Requirements.157Test methods.218Marking.279Documentation.27SIST EN 12098-2:2002
Page 3EN 12098-2:2001ForewordThis European Standard has been prepared by Technical Committee CEN/TC 247 "Controls formechanical building services", the secretariat of which is held by SNV.This European Standard shall be given the status of a national standard, either by publicationof an identical text or by endorsement, at the latest by October 2001, and conflicting nationalstandards shall be withdrawn at the latest by October 2001.This standard is one of a series of product standards for "Controls for Heating Systems". Itconsiders Definitions, Functionality, Requirements, Test methods, and Documentation for hotwater heating controls with optimum start or optimum start-stop functions.The position of this standard in the series of standards about mechanical building servicescomes out of the illustration below:Mechanical Building ServicesHeating systemsControl for mechanicalbuilding servicesVentilation andair conditioningsystemsControls forheating systemsIndividual zonecontrol forHVAC
applicationsBuilding managementproducts and systems forHVAC
applicationsSystem neutral datatransmission forHVAC
applicationsOutside temperaturecompensated controlequipment for hotwater heating systemsOptimum start-stopcontrol equipment forhot water heatingsystemsOutside temperaturecompensated controlequipment for electricalheating systemsOptimum start-stopcontrol equipment forelectrical heatingsystemsDefinitionsFunctionalityRequirementsTest methodsDocumentation HVAC: Heating, ventilation, air conditioning.NOTE
This illustration was updated and deviates from Part 1.According to the CEN/CENELEC Internal Regulations, the national standards organizations ofthe following countries are bound to implement this European Standard: Austria, Belgium,Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom.SIST EN 12098-2:2002
Page 4EN 12098-2:2001IntroductionEquipment which controls the heating supply in buildings according to outside and/or roomtemperature is necessary to reduce the energy consumption of heating plants and maintaincomfort level. Fixed switching times for intermittent scheduling, like an outside temperaturecontroller according to EN 12098-1:1996, may not lead to energy saving and comfortoptimisation. An optimum start-stop controller schedules switching times in relation withmeasured variables. Its function brings a high level of energy saving without reduction ofdesired comfort. It complements a main controller like an outside temperature controller (OTC).The optimum start-stop function also brings benefits to the user because it is easier toprogramme. The user sets the time at which comfort conditions should apply, rather than theswitch-on or switch-off times of the plant. Without the optimum start-stop function, switch timesmay have to be manually changed to achieve energy savings and acceptable comfort levels.NOTEOptimum start-stop functions is illustrated by Figure 1: Heating periods are different fromscheduled occupation periods. These differences, due to thermal inertia, depend mainly on heating loads(or temperatures differences). A start-stop optimiser controls these switchings, using outside and/or roomtemperatures or their differences in relation to setpoints.Nominal occupation periodOccupationOccupationStartStopStartStartStop14161820048122420164481220162400ScheduleoccupationperiodsHeatingoperationRoomtemperature8Hour of day°CMaincontrollerfunctionMaincontrollerfunctionMaincontrollerfunctionFigure 1 - Relation between occupation, heating and room temperatureAdaptive functions are easier to commission because they require fewer installationadjustments and no readjustment.Included in this standard are the main equipment characteristics which assist in reaching theseenergy saving and comfort objectives.Characteristics which are directly tested include:accuracy of sensorspart load characteristicsCharacteristics which are required to be indicated by the manufacturer include:time constantsSIST EN 12098-2:2002
Page 5EN 12098-2:2001Other characteristics of the equipment are tested indirectly by measuring responses dependenton them, for example:differentialdead bandNOTEThis standard, therefore, conforms to the requirements and objectives of the interpretativedocument n° 6 "Energy Economy and Heat Retention" relating to the Construction Product Directive(89/106/EEC).1 ScopeThis standard applies to electronic equipment which controls heating systems with water as theheating medium and a flow temperature up to 120 °C. The signals can be processed by usingeither analogue or digital techniques, or both. The particular equipment to which this standardapplies covers both :stand-alone start optimisers or start-stop optimisers, taking priority to the main controllerduring periods.controllers which contain an integrated optimum start or an optimum start-stop controlfunction.It applies both to adaptive and fixed parameters control functions and sets minimum acceptablestandards for functions, performance and documentation.NOTEThe optimum start-stop function can be integrated within a main control device such as anoutside temperature compensated (OTC) controller. In this case the controller would be expected to meetboth Part 1 and Part 2 of this standard (see EN 12098-1:1996).Safety requirements on heating systems and heating control systems remain unaffected by thisstandard. The actuators and the dynamic behaviour of the valves are not covered in thisstandard.This control equipment may or may not be connected to a data network.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisionsof any of these publications apply to this European Standard only when incorporated in it byamendment or revision. For undated references the latest edition of the publication referred toapplies (including amendments).EN 12098-1:1996Controls for heating systems – Part 1: Outside temperature compensated control equipmentfor hot water heating systemsEN 60529Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)EN 60730-1Automatic electrical controls for household and similar use – Part 1: General requirements(IEC 60730-1:1993, modified)SIST EN 12098-2:2002
Page 6EN 12098-2:2001EN 60730-2Automatic electrical controls for household and similar use – Part 2: Particular requirementsfor thermal motor protectors (IEC 60730-2 series, modified)IEC 60038EC standard voltages3 Terms and definitionsFor the purposes of this European Standard the terms and definitions given in EN 12098-1:1996and the following apply.3.1start-stop optimisercontrol device which performs optimum start-stop functions. It consists of the electroniccontroller, sensors and output signals, but does not include the actuating equipment (seeFigure 2).It overrides signal(s) issued by a main controller, from switch-off time to beginning of nominaloccupation period. Start-stop optimisers and main control functions can be included in a singledevice.The optimum stop function is optional, a start optimiser performs an optimum start function anda fixed switch-off time function.SIST EN 12098-2:2002
Page 7EN 12098-2:2001PriorityselectorMain ControllerOutside Temperature Compensated controlequipment, according to EN 12098-1Start-Stop-Optimiser, according to EN 12098-2OptimiserfunctionsReferencevariablesSensorsControlledvariableActuatingequipmentHEATGeneration&DistributionFigure 2 - Example of control equipment for heating systems3.2optimum startthis function controls the switch-on time such that the room temperature reaches the nominalroom temperature from a lower level (e.g. reduced or stand-by room temperature), at apredefined time: the beginning of nominal occupation period.3.3adaptive optimum startadded function to optimum start, which recalculates the parameters used to determine theswitch-on time, based on measured room temperature as feedback information.3.4optimum stopthis function controls the switch-off time, anticipates the end of nominal occupation period inreference to the room temperature, such that the natural fall of the room temperature duringnominal occupancy period is kept within acceptable limits satisfying comfort needs.3.5adaptive optimum stopadded function to optimum stop, which recalculates the parameters used to determine theswitch-off time, based on measured room temperature as feedback information.SIST EN 12098-2:2002
Page 8EN 12098-2:20013.6actuating equipmentequipment providing the means by which the controller affects the controlled variable(according to 3.2 of EN 12098-1:1996).See Figure 2.3.7controlled variable of the optimiserboiler and/or supply water temperature controlled by start-stop optimiser, during its controlperiod, i.e. from switch-off time to beginning of nominal occupation period.3.8output signalssignals generated by the controller for operating the actuating equipment (according to 3.4 ofEN 12098-1:1996).3.9reference variable(s) of the optimiserfor optimum start function: the outside temperature or the room temperature, or both, used todetermine the switch-on time, with or without other influencing variables (see 3.2).For optimum stop function: the room temperature used to determine the switch-off time, with orwithout other influencing variables (see 3.3).3.10outside temperaturereference variable that is measured with a sensor fitted outside the building, mainly intended tomeasure the air temperature (according to 3.6 of EN 12098-1:1996).3.11nominal room temperatureresulting room temperature in the building arising in nominal operation of the controller. It isdependant on the design of the heating system and can be different for individual rooms(according to 3.8 of EN 12098-1:1996).3.12reduced room temperaturereduced room temperature compared with the nominal room temperature resulting fromoperation at a reduced set point (according to 3.9 of EN 12098-1:1996).3.13stand-by room temperatureroom temperature resulting from switching off the heating (according to 3.10 ofEN 12098-1:1996).3.14beginning of nominal occupation perioduser programmed time for which the nominal room temperature should begin to apply.SIST EN 12098-2:2002
Page 9EN 12098-2:20013.15switch-on timepoint in time at which the controller starts-up the heating or increases the boiler/supply watertemperature in order to reach the nominal room temperature (according to 3.12 ofEN 12098-1:1996)This time is automatically determined by the optimum start function.3.16end of nominal occupation perioduser programmed time for which the nominal temperature should decrease under the nominalroom temperature.3.17switch-off timepoint in time at which the controller switches off the heating or decreases the boiler/supplywater temperature (according to 3.13 of EN 12098-1:1996).This time is automatically determined by the optimum stop function.For a optimum stop function, the switch-off time is a variable based on the user programmedend of nominal occupation period.3.18nominal occupation periodoperating period during which nominal room temperature should apply.3.19optimum start periodoperating period between the switch-on time and the beginning of nominal occupation period.3.20optimum stop periodoperating period between the switch-off time and the end of nominal occupation period.3.21reduced operationoperating period from the switch-off time up to the switch-on time, maintaining a reduced roomtemperature compared with the nominal room temperature (according to 3.15 ofEN 12098-1:1996)3.22stand-by operationmode in which the heating is switched-off (according to 3.16 of EN 12098-1:1996).3.23manual operationmode in which the controller is inactive and the actuating equipment can be manipulatedmanually (according to 3.17 of EN 12098-1:1996).3.24frost protection operationfunction in all operation modes (except manual operation) to prevent the heating system fromfreezing by providing specific output signals to actuators (according to 3.18 ofEN 12098-1:1996).SIST EN 12098-2:2002
Page 10EN 12098-2:20011: nominal room temperature2: reduced room temperature3: stand-by room temperatureA(o): beginning of nominal occupation period(fixed)A(x): switch-on time (variable)B(o): end of nominal occupation period (fixed)B(x): switch-off time (variable)A(o) - B(o): nominal occupation periodA(x) - A(o): optimum start periodB(x) - B(o): optimum stop periodB(x) - A(o): priority to the start-stop optimiserA(o) - B(x): priority to a main controllerFigure 3 - Temperature-time curve4 Functionality4.1 Functional Objectives4.1.1 GeneralOptimum start-stop control equipment achieves high levels of energy saving by reducing, orpreferably, switching off heating systems and controlling optimum start heating by takingaccount of the thermal inertia of the building and heating system, in such a way that therecovery to the nominal room temperature from a lower room temperature is done in theminimum time.The start period duration and the controlled variable are relative to reference variable(s) whichfall into three classes:Class A:reference variable is measured outside temperature (and temperature setpoints), withor without other influencing variables.Class B:reference variable is measured room temperature (and temperature setpoints), with orwithout other influencing variables.Class C:reference variables are measured outside and room temperature (and temperaturesetpoints), with or without other influencing variables.Classes may be capable of more than one function. Table 1 shows those possibilities :SIST EN 12098-2:2002
Page 11EN 12098-2:2001Table 1- ClassesClassesOptimum StartOptimum StopAdaptive Optimum Start orAdaptive Optimum StopAyesnonoByesoptionaloptionalCyesoptionaloptional4.1.2 Optimum Start (Class A, B, C)The aims are to save energy and satisfy comfort needs at the start of a nominal occupationperiod. This is achieved by assuming the thermal behaviour of the heating plant and building,switching on and controlling the heating plant at a maximum or other high level, such that theroom temperature rises rapidly from the stand-by or reduced level to its target level at the startof the nominal occupation period. The switch-on time may be limited by design or a userparameter.4.1.3 Adaptive Optimum Start (Class B, C)An additional aim to optimum start is to make the control easy to use and apply to manyapplications with the minimum of adjustment.This is achieved by periodically modifying the characteristic optimum start curve, withknowledge of the dynamic thermal behaviour of the heating plant and the building, to minimisethe time error from the defined start time of the nominal period. Adaptation may be permanentlyenabled or disabled and/or enabled for a specified number of adaptation cycles or until anoptimum condition is met.4.1.4 Optimum Stop (Class B, C)The aims are to save energy and maintain a comfort level before the end of a nominaloccupation period. This is achieved by assuming the thermal behaviour of the heating plant andbuilding, switching off or reducing the heating before the end of the nominal occupation periodsuch that the room temperature does not fall below an acceptable comfort level. This lowerlevel may be less than the achieved comfort level at the start and during the nominal operationperiod. The maximum value of the switch-off time may be limited by design or a userparameter.4.1.5 Adaptive Optimum Stop (Class B, C)An additional aim to optimum stop is to make the control easy to use and applied to manyapplications with the minimum of adjustment.This is achieved by periodically modifying the characteristic optimum stop curve, withknowledge of the dynamic thermal behaviour of the heating plant and the building, to producean acceptable comfort level at the end of the nominal occupation period and to maximise theswitch-off time and/or the reduction in energy level. This end comfort level may be less than theachieved comfort level at the start of the nominal occupation period. Adaptation may bepermanently enabled or disabled and/ or enabled for a specified number of adaptation cycles oruntil an optimum condition is met.NOTEFunctions described in this standard apply to plants with heating sources able to provide anincreased, maximum or repeatable power (heating) or maintain constant the controlled variable. Somesystems are unable to provide sufficient stability of heating supply.These heating systems can require measurement of the primary supply temperature, or heat poweravailable for boost and special algorithms (non linear, multiple parameters and/or multiple variables).SIST EN 12098-2:2002
Page 12EN 12098-2:2001Examples: multiple boilers with some kinds of sequencing control, primary hot water supply systems controlled according to outside temperature.Some other functions can be added to intermittent heating control function: allow comfort temperature to rise during a limited duration after start of occupancy, forcomfort needs, automatically offset reduced room temperature level. When the heating load is nearmaximal power and abnormally long optimum start times are required the reduced roomtemperature can be raised closer to the comfort temperature, cold wall effect compensation. An averaging method of air and wall temperatures to allowfor different structures, compensate for long unoccupied periods (or long periods at a reduced temperature) with asignificant extra energy input to achieve the specified temperature and time requirements.The long-term thermal behaviour of buildings can often necessitate longer anticipationtimes than would normally be expected. Sometimes known as the Monday morning effect. a maximum switch-on time is generally regarded by the users and energy managers as adesirable requirement.4.2 Control equipment functionalityOptimiserOutside Sensor(Class A, C)Room Sensor(Class B, C)Other ReferenceVariableOptimum StopAdaptivefunctionOptimum StartAdaptivefunctionSignal(s)for ActuatorsBoolean tomain controllerOptimum StopParametersOptimum StartParametersOperation ModeSettingsClock SettingsFrost SettingsFigure 4 - Block Schematic of Start – Stop Optimiser (SSO) Control EquipmentSIST EN 12098-2:2002
Page 13EN 12098-2:20014.3 Function block(s)Class INPUTSOUTPUTSB, C Room Temperature.RealTRA, C Outside Temperature.RealTOOther reference variables.RealTXControlled variable.RealTWPOVAR ActuatingActual Time.RealtequipmentPARAMETERSOptimum Start Characteristic.RealSTARTCSTATUSBoolean. forNominal Occupation Period.RealNOPseparate OptimiserReduced (or standby).RealTRSPand main controllerRoom temperature setpointpriorityRoom Temperature setpoint.RealRSPMax. Switch-on period.RealBTFigure 5 - Optimum Start (Class A, B, C)Class INPUTSOUTPUTSB, C Room Temperature.RealTRC Outside Temperature.RealTOOther reference variables.RealTXControlled variable.RealTWPOVAR ActuatingActual Time.RealtequipmentPARAMETERSOptimum Stop Characteristic.RealSTOPCNominal Occupation Period.RealNOPReduced (or standby).RealTRSPRoom temperature setpointRoom Temperature setpoint.RealRSP STATUSBoolean. forMax. Switch-off period.RealETseparate Optimiserand main controllerpriorityFigure 6 - Optimum Stop (Class B, C)SIST EN 12098-2:2002
Page 14EN 12098-2:2001Class INPUTSOUTPUTSRoom Temperature.RealTRC Only Outside Temperature.RealTOOther reference variables.RealTXControlled variable.RealTWPOVAR ActuatingActual Time.RealtequipmentPARAMETERSOptimum Start Characteristic.RealSTARTCSTATUSBoolean. forOptimum Stop Characteristic.RealSTOPCseparate OptimiserNominal Occupation Period.RealNOPand main controllerReduced (or standby).RealTRSPpriorityroom temperature setpointRoom Temperature setpoint.RealRSPEnable/Disable Adaptive function
BoolADAPTFigure 7 - Adaptive Optimisation (Class B and C)Table 2 - Generalised version for all classes (A, B, C):NameTypeDescriptionUnitInputsTORealOutside temperature°CTRRealRoom temperature°CTWRealControlled variable°CTXRealOptional°CtTimeActual timeminOutputsPOVariActuating equipment(optional), e.g. valve, pump, burnerSTATUSBoolOptimiser status(control to main controller or optimiser)ParametersSTARTCRealCharacteristic Optimum Start CurveSTOPCRealCharacteristic Optimum Stop CurveNOPRealNominal Occupation Periodday/h/minTRSPRealReduced (or standby)Room temperature setpoint°CRSPRealRoom temperature setpoint°CADAPTBoolEnable/Disable adaptive functionBTRealMaximum Switch-on time periodminETRealMaximum Switch-off time periodminParameters or variables are used according to classes and options as described in Table 1.SIST EN 12098-2:2002
Page 15EN 12098-2:20015 Graphical symbols and abbreviationsThe graphical symbols according to EN 12098-1:1996, Annex A (informative) arerecommended for the use on the user interface.Plain language can be used instead of, or in conjunction with, graphical symbols.6 Requirements6.1 Data ProtectionAll data input on commissioning shall be retained for at least 72 hours on failure of the supplyvoltage.6.2 SensorsThe following tolerances are required from sensors in the indicated ranges:Table 3 - Sensor accuracySensorTemperature rangeAccuracyRoom temperature+ 15 to + 25 °C± 0,8 KBoiler water temperature+ 40 to + 60 °C± 1,0 KOutside temperature– 10 to + 18 °C± 1,0 KIf temperature ranges have to be increased for geographical/climatic reasons, this shall be clearlyindicated by the manufacturer.Time constants and characteristics of the sensors shall be stated in the technicaldocumentation of the product.6.3 Optimiser operating modesFrom switch-off time to switch on time, optimisers shall facilitate at least stand-by operation.Reduced operation can be provided.6.4 Stand-by operationIn stand-by operation the energy supply to the heating system shall be switched off (except forfrost protection according to 6.6 of EN 12098-1:1996).6.5 Frost protection6.5.1 Class A optimiserIn all operating modes (except for manual operation) a frost protection function shall beeffective if the outside temperature falls to minimum of 0 °C and the boiler-supply watertemperature to minimum of 5 °C, if this variable is controlled.SIST EN 12098-2:2002
Page 16EN 12098-2:20016.5.2 Class B optimiserIn all operating modes (except for manual operation) a frost protection function shall beeffective if the room temperature falls to minimum of 5 °C and the boiler-supply water tominimum of 5 °C, if this variable is controlled.6.5.3 Class C optimiserClass A or Class B optimiser frost protection function, or both.6.6 Switching TimesThe setting and accuracy requirements for the switching times and clock are shown in Table 4.Table 4 - Switching times and clockSWITCHING TIMESCLOCKMinimum No.of settingsResolution ofSettingsAccuracyResolutionof settingAccuracyDigital clock4/day1) 0.5 h 1 minute 1 minute 30 minutes/yearAnalogue clock4/day for a clock24-hour2 for a weeklyclock 0.5 h for a dayclock 2 h for a weekclock2) 10 minutes 10 minutes 30 minutes/year1)Summarising blocks are acceptable2)The minimum switching period shall be no longer than 4 hours6.7 Parameter Setting FacilitiesThe following facilities shall be provided for the user:Clock timeTimes for nominal occupation periodTemperature settings6.8 Factory Settings / Defaults6.8.1 Optimum Start ParametersIf factory set values to describe the characteristic are provided they shall be declared in thetechnical documentation and may also be indicated on the start-stop or start optimiserequipment.6.8.2 Optimum Stop ParametersIf factory set values to describe the characteristic are provided they shall be declared in thetechnical documentation and may also be indicated on the start-stop optimiser equipment.6.9 Optimum Start CharacteristicThe range of characteristic optimum start curves shall be represented in a suitable manner onthe unit or in the technical documents.SIST EN 12098-2:2002
Page 17EN 12098-2:20016.9.1 Class A optimisersThe measured optimum start time period shall not deviate from the time shown on thecharacteristic optimum start curve (Figure 8) by more than 15 minutes.Figure 8 - Optimum start curve – Class A Optimiser6.9.2 Class B optimisersThe measured optimum start period shall not deviate from the time shown on the characteristicoptimum start curve (Figure 9) by more than 15 minutesFigure 9 - Optimum start curve – Class B Optimiser6.9.3 Class C optimisersThe measured optimum start period shall not deviate from the time shown on the characteristicoptimum start curve (Figure 10) by more than 15 minutes.1020Optimumstart periodtminKToDifferential Outside Temperature(nominal room temperature setting – Outside temperature)26Optimumstart periodtminTrDifferential Room Temperature(nominal room temperature setting – Room temperature)KSIST EN 12098-2:2002
Page 18EN 12098-2:2001Figure 10 - Optimum start curve – Class C Optimiser6.9.4 Adaptive optimum start function (class B or C optimisers)After a number of learning cycles, declared by the manufacturer have been completed, disablestart adaptive function and perform tests as indicated for a non adaptive device.
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