Installation And Servicing Instructions GREENSTAR HE Combi

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Installation and Servicing InstructionsGREENSTAR HE combiWall mounted condensing boiler for central heating and mainsfed domestic hot water6 720 610 577-00.106 720 610 576 GB (02.05) OSWZWB 7-27 HE combi GC-Number: 47 311 55

ContentsContentsSafety 445567892Details of the applianceEC Declaration of ConformityStandard packageDescription of applianceAccessoriesCasing dimensionsLayout of applianceFunctionElectrical wiring diagramTechnical dataInstallation 93.9.13.9.23.9.3InstallationImportant remarksDomestic hot waterSealed systemsSiting the applianceWall mounting frame assemblyPre-piping the systemFitting the applianceChecking the connectionsFlue SystemsSiting the Flue TerminalInstallation of the flueFlue duct preparation and assembly44.14.2Electrical connections21Connecting the appliance21Mains Voltage external controls connections ningSwitching the appliance on/offSwitching on the central heatingSystem controlsSetting the domestic hot watertemperature and flow rate5.5.1 Domestic hot water temperature5.5.2 Hot water flow rate5.6 Summer mode (hot water only)5.7 Frost protection5.8 Pump anti-seize function5.9 Fault Individual settingsMechanical settingsChecking the size of the expansion vesselSetting the central heating flow temperatureChanging the heating pump characteristicSettings on the Bosch HeatronicOperating the Bosch HeatronicSelecting the pump control mode for centralheating mode (Service Function 2.2)Setting the anti-cycle time(Service Function 2.4)Setting the maxim CH flow temperature(Service Function 2.5)Setting the switching difference(Service Function 2.6)Setting the heating output(Service Function 5.0)Constant hot water cycle time(Service Function 6.8)Setting the gas/air ratio26262626262727272728282828287Converting the appliance to differentgas types7.1 Setting the gas/air ratio7.2 Testing combustion air/flue gas at setheat output7.2.1 Testing the O2 or CO2 level in thecombustion air7.2.2 Testing CO and CO231318Maintenance8.1 Pre-Service Check List8.2 Description of servicing operations8.3 Replacement of Parts8.3.1 PCB control board and transformer8.3.2 Fan Assembly8.3.3 Pump8.3.4 3-way diverter valve8.3.5 3-way diverter valve motor8.3.6 Sensors8.3.7 Gas Valve8.3.8 Domestic Hot Water Heat Exchanger8.3.9 Electrode assembly8.3.10Pressure gauge8.3.11Expansion vessel8.3.12Pressure Relief Valve8.3.13Burner8.3.14Flow switch8.3.15Primary Heat lt CodesShort parts listHeating/hot water output settings (N.G.)Heating/hot water output settings (L.P.G)Operational Flow diagramsDomestic hot water functionCentral heating function2929316 720 610 576 GB (02.05)

Safety precautionsSafety precautionsIf you smell gasB Turn off gas service cock at the meter.B Open windows and doors.B Do not operate any electrical switches.B Extinguish any naked flames.B Telephone your gas company.If you smell fumes from the applianceB Switch off appliance (see page 24).B Open windows and doors.SymbolsSafety instructions in this documentare identified by a warning-triangle symbol and are printed on a grey background.iNotes containing important informationare identified by the symbol shown on theleft. They are bordered by horizontal linesabove and below the text.Fitting and modificationsB Fitting of the appliance or any controls to the appliance may only be carried out by a competent engineer in accordance wth the Gas Safety (Installationand Use) Regulations 1998.B Flue systems must not be modified in any ways otherthan as described in the fitting instructions.B This appliance is for use on sealed primary systemsonly.MaintenanceB The user is recommended: to have the systemregularly serviced in order to ensure that it functionsreliably and safely.B Use only original spare parts!Combustible materialsB Do not store or use any combustible materials(paper, thinners, paints etc.) in the vicinity of theappliance.Health and safetyB This appliance contains no asbestos products.B There is no potential hazard due to the appliancebeing electrically unsafe.B There are no substances used in the constructionthat are a potential hazard in relation to the COSHHRegulations (Control of Substances Hazardous toHealth Regulations 1988).Combustion air/Ambient atmosphereB The combustion air/ambient atmosphere should bekept free of chemically aggressive substances (e.g.halogenated hydrocarbons which contain chlorine orfluorine compounds). This will prevent corrosion.Instructions to the customerB Explain to the customer how the appliance works andhow to operate it.B Advise the user that he/she must not make any modifications to the appliance or carry out any repairs on itB These instructions are to be left with the user or atthe Gas meter.B Important: These instructions apply in the UK only.6 720 610 576 GB (02.05)3

Details of the appliance1Details of the appliance1.1EC Declaration of ConformityThis appliance is in accordance with the applicablerequirements of the Gas Appliance Directive, Boiler Efficiency Directive, Electromagnetic Compatibility Directive and the Low Voltage Directive.1.3Description of appliance Wall-mounted appliance, siting not dependent onroom size Natural gas models are low-emission appliances Multifunction displayPINCE-0085 BL 0507CategoryUKII2H 3P Modulating controlAppliance TypeC13, C33 Full safety systems incorporating Bosch Heatronicwith flame ionisation monitoring, solenoid valves andtemperature sensors Automatic ignitionTable 11.2Standard package Gas condensing combination boiler for central heating and domestic hot water Wall mounting frame Clamp for securing flue duct kit Fixings (screws etc.) Set of documentation for appliance Pre-plumbing manifold Condensate drain pipe. Bosch Heatronic control system Concentric flue/air duct with testing point forCO2/CO Regulated speed fan Pre-mix burner Temperature control for central heating Temperature sensor in domestic hot water Safety temperature limiter in 24 V electrical circuit Three-speed central heating pump with automaticvent Relief valve, pressure gauge, expansion vessel Flue gas temperature limiter (105 C) Hot water priority circuit Motorised 3-way valve Plate-type heat exchange Condensate Trap.46 720 610 576 GB (02.05)

Details of the appliance1.4Accessories Standard horizontal flue kit at 100 mm outsidediameter for flues upto 4 m in length. Flue duct kits for horizontal (125 mm outsidediameter) for flue lengths upto 13 m and vertical fluesystems for flue lengths uto 15 m. Fitting instructionsare sent with these kits. Heating programmer Timer Security kit.1.5Casing 0353603952506 720 610 601-01.1OFig. 113101103XYZManifold assemblyOuter caseFacia coverStandard Concentric Horizontal Flue System: min. 310 mmAlternative Concentric Flue System: min. 250 mmStandard Concentric Horizontal Flue System: 158 mmAlternative Concentric Flue System: 121 mmStandard Concentric Horizontal Flue System: 105 mmAlternative Concentric Flue System: 130 mm6 720 610 576 GB (02.05)5

Details of the appliance1.6Layout of 9841746 720 610 576-02.2OFig. c controlHeat exchanger safety temperature limiterHot water NTC sensorTesting point for gas supply pressurePressure gaugeFlue gas temperature limiterRelief valvePumpPump speed selector switchExpansion vesselAutomatic air ventAir gas Mixer unitElectrode assemblyTemperature sensor in CH flowCH flowAdjustable gas flow restrictorAdjusting screw for min. gas flow volume3-way valve (combi)DHW flow switch 15416417418423Inspection windowFixing pointsFlue ductCombustion air intakeFan assemblyAppliance type stickerTesting point for combustion productsTesting point for combustion airFlue ductCover plate for twin flue duct connectionPlate-type domestic hot water heat exchangerCondensate trapCover plate for cleaning accessCondensate collectorClip for fixing outer caseData plateSiphon6 720 610 576 GB (02.05)

Details of the appliance1.7FunctionFig. 252.155565761Bosch Heatronic controlTemperature limiter, heat exchangerHot water NTC sensorTesting point for gas supply pressurePressure gaugeFlue gas temperature limiterManifoldSafety valveCentral heating pumpExpansion vesselCharging valveAutomatic ventMixer unitBi-metallic thermostat for combustion air compensationBurnerFlame sensing electrodeIgniter electrodeHeat exchanger with cooled combustion chamberTemperature sensor in CH flowCH flowHot water flowGas inletCold water inletCH returnSolenoid valve 1Solenoid valve 2FilterGas valve CE 427Main valve discReset button6 720 610 576 GB 317355358423443Adjustable gas flow restrictorAdjusting screw for min. gas inlet flow volumeControl valveMotor3-way valveVenturiPressure relief valveWater flow regulatorDiaphragmPushrod with switch camMicroswitchValve for hot water flow volumeWater valveFlue ductFanInner casingTesting point for flue gasTesting point for combustion airDisplayPlate-type heat exchangerCondensate trapSiphonDiaphragm7

Details of the appliance1.8Electrical wiring diagramo - orange g - green bl - blackr - redp - purple3336536461317366363367ECO4.125 V153230V/AC230 V310136135312328302313151318315124 789L N Ns Ls LR161ppp300 31484M96328.19Mmains supply18g6Mgorro2265252.156ooblblblbl36bl6.1326 720 610 576-08.2OFig. on transformerTemperature limiter, heat exchangerHot water NTC sensorFlue gas temperature limiterPumpFlame sensing electrodeIgnition electrodeTemperature sensor in CH flowSolenoid valve 1Solenoid valve 2Gas valve CE 427Reset buttonMotor, 3-way valveMicroswitch, hydraulic switchMaster switchTemperature control for CH flowFuse, slow 2.5 A, AC 230 8.1363364365366367LinkFanCode plugEarth connectionTemperature control for hot waterFuse, slow T 1,6 AFuse, slow T 0,5 AConnector for programmerTerminal block for programmerDigital displayConnector for timerTerminal block for AC 230 V Mains supplyLinkIndicator lamp for burnerIndicator lamp for power supply“Chimney sweep” buttonService buttonECO button6 720 610 576 GB (02.05)

Details of the appliance1.9Technical dataUnitsMax. rated heat output net 40/30 C central heatingkWMax. rated heat output net 50/30 C central heatingkWMax. rated heat output net 80/60 C central heatingkWMax. rated heat input netkWMin. rated heat output net 40/30 CkWMin. rated heat output net 50/30 CkWMin. rated heat output net 80/60 CkWMin. rated heat input netkWMax. rated heat output net, domestic hot waterkWMax. rated heat input net, domestic hot waterkWMaximum gas flow rate – After 10 minutes from lightingNatural gas G20 (His 9,5 kWh/m3)m3/hLPG (Hi 12,9 kWh/kg)kg/hGas supply pressureNatural gas G20mbarLPGmbarExpansion vesselCharge pressurebarTotal capacitylHot water specificationsHot water flow rate (factory setting)l/minMax. hot water flow ratel/minOutlet temperature range CMax. permissible water supply pressurebarMin. inlet pressurebarSpecific flow ratel/minFlueFlue gas temp. 80/60 C, rated/min. load CFlue gas temp. 40/30 C, rated/min. load CResidual delivery pressure(inc. pressure drop in air intake duct)PaCO2 level at max. rated heat output%%CO2 level at min. rated heat outputNOx-classSEDBUK figure, Band A%CondensateMax. condensation rate (tR 30 C)l/hpH-value, approx.General DataElectrical power supply voltageAC . VFrequencyHzMax. power consumptionWNoise output leveldB(A)Appliance protection ratingIPMax. CH flow temperature CMax. permissible operating pressure (CH)barPermissible ambient temperatures CNominal capacity of appliancelWeight (excluding packing)kgNatural 75100.751081440 - 60100.212.481440 - 11.0590.62.34.82.34.82305010136X4Dnom. 902.50 - 603.75462305010136X4Dnom. 902.50 - 603.7546Table 26 720 610 576 GB (02.05)9

Details of the applianceCondensate analysis, mg/lVERTICAL 125 mm FLUE SYSTEMAmmonium 1.2Nickel 0.15Lead 0.01Mercury 0.0001Overall Diameter of Ductmm125Cadmium 0.001Sulphate 1Flue Terminal / Duct Assemblymm1360Chromium 0.005Zinc 0.015Extension Duct Lengthmm200Halogenatedhydrocarbons 0.002Tin 0.01Extension Duct Length - Fixedmm450Hydrocarbons 0.015Vanadium 0.001Extension Duct Length - Fixedmm950Copper 0.028pH-value 4.8Extension Duct Length - Fixedmm1950Extension Duct Length - Telescopicmm265375Extension Duct Length Adjustable (Cut to length)mm450Table 3Flue systemHORIZONTAL 100 mm – StandardOverall Diameter of Ductmm100Flue Terminal / Duct Assembly Lengthmm750Extension Duct Lengthmm1000Max.4mMax.15 mTable 6Elbow - 90 Bend - 45 Equivalent length 2 m Equivalent length 1mGas supplyTotal length of gas supply pipe(metres)Table 4ALTERNATIVE HORIZONTAL 125 mm FLUE SYSTEMOverall Diameter of Ductmm125Flue Terminal / Duct Assemblymm550Extension Duct Length - Fixedmm200Extension Duct Length - Fixedmm450Extension Duct Length - Fixedmm950Extension Duct Length - Fixedmm1950Extension Duct Length Telescopicmm265375Extension Duct Length - Adjustable (Cut to length)mm20036Pipe diameter(mm)9Gas discharge rate (m3/h)Max.13 m(includingturret)8.75.84.62218.012.09.428Table 7Domestic water performanceTemperatureRise30 C13.2TemperatureRise35 C11.3TemperatureRise40 C9.9Maximum Mains pressurebar10.0Minimum Mains pressurebar0.2DomesticWater FlowRate l/minTable 5Table 8106 720 610 576 GB (02.05)

Installation regulations2Installation regulationsGas Safety (Installation & Use) Regulations 1998: Allgas appliances must be installed by a competent person. Failure to install correctly could lead to prosecution.The manufacturers notes must not be taken, in any way,as overriding statutory obligations.The appliance must be installed in accordance with thecurrent IEE Wiring Regulations, local Building Regulations, Building Standards (Scotland) (Consolidation),bye-laws of the local Water Company, Health andSafety Document 635 (Electricity at Work Regulations1989) and any other local requirements.Product Liability regulations indicate that, in certain circumstances, the installer can be held responsible, notonly for mistakes on his part but also for damage resulting from the use of faulty materials. We advise theinstaller to avoid any risk by using only quality approvedbranded fittings.The relevant British Standards should be followed i.e. BS 6798: Specification for the installation of gasfired hot water boilers of rated input not exceeding60kW BS 5449: Central Heating for Domestic Premises BS 5546: Installation of gas hot water supplies fordomestic purposes BS 5440:1: Flues and ventilation for gas appliancesof rated input not exceeding 70 kW (gross): Flues3InstallationB Always turn off the gas cock before carrying out any work on componentswhich carry gas.i3.1Fixing of the appliance, gas and flue connections, commissioning of the systemand electrical connections may only becarried out by competent persons authorised by CORGI.Important remarksB Appliance should only be installed in sealed centralheating systems.B To avoid gas formation in the system, galvanised radiators or pipes must not be used.B If a room thermostat is used: do not fit a thermostaticradiator valve on the radiator in the primary room.B Add a suitable anti-freeze fluid compatible with aluminium to the water in the central heating system.Suitable products are available from Betz-DearbornTel.: 0151 4209563 and Fernox Tel.: 01799550811.B In our experience, the addition of sealing agents tothe water in the central heating system can causeproblems (deposits in the heat exchanger). For thatreason we advise against their use. BS 5440:2: Flues and ventilation for gas appliancesof rated input not exceeding 60 kW (gross): AirSupply BS 6891: Installation of low pressure gas pipeworkinstallations up to 28mm (R1). BS 7074:1: Code of practice for domestic heatingand hot water supply.These instructions must be followed.6 720 610 576 GB (02.05)11

Installation3.2Domestic hot water3.3Sealed systemsAny regulations specified by the local water companymust be observed.The appliance must not be operated without the systembeing full of water, properly vented and pressurised.The final 600 mm of the mains cold water connection tothe applaince should be made in copper tube only.The expansion vessel has a volume of 10 litres and ischarged to a pressure of 0.75 bar.The appliance is suitable for a mains supply having amaximum pressure of 10 bar. A pressure reducing valvemust be fitted, if necessary.The water capacity of the system is shown in table 11,page 26. If a greater capacity is required then an additional expansion vessel must be fitted into the systemreturn as close to the appliance as possible. The systempressure can be set up to a maximum of 1.5 bar with 1bar being the normal setting.The hot water outlet temperature is set to be capable ofachieving a maximum of 60 C. The maximum temperature and the frequency of the recharge of the heat storemay be reset.The maximum water flow rate is factory set at 9.9 l/minto give temperature rise of 40 C. If a higher rise isrequired then the flow must be reduced at the tap andthe discharge temperature will rise up to the maximumset figure.If the system pressure is greater than 2.65 bar when theappliance is operating at maximum temperature then anadditional expansion vessel must be fitted into the system return as close to the appliance as possible.The filling point must be at low level and arranged asshown in figs. 5 and 6.The temperature rise, upto the maximum set by the user,is automatically maintained by the modulation of theheat input. In winter, when the mains temperature is verylow, the water flow, adjusted at the tap or shower,should be reduced to maintain the required deliverytemperature.The pressure relief valve is set to operate at 3 bar.It is suggested that long pipe runs to taps or showersbe insulated to prevent the rapid cooling of the water.If Thermostatic Radiator Valves are fitted then it is recommended that one radiator is left open.All types of single lever mixer taps and thermostaticmixer units suitable for a mains pressure of up to 10 barcan be used.Repeated venting probably indicates a leak and thismust be rectified to ensure the proper operation of theappliance.The head of a loose-head shower must not be allowedto fall within 25 mm of the top the bath to prevent therisk of water being drawn back into the mains. Alternatively the shower must be fitted with an anti-syphonagedevice at the point of the flexible hose connections.No galvanised radiators or pipes must be used.Over-rim bidets may be connected to the appliance provided that it is in accordance with the requirements ofthe local water company. The outlet(s) should beshrouded and unable to have any temporary hand heldspray attached. No anti-syphonage arrangements arenecessary.In exceptionally hard water areas a device to preventscale formation may be fitted or, alternatively, the maximum temperature reset to about 45 C which mayreduce the risk of scale formation. The installation of ascale inhibitor assembly should be in accordance withthe requirements of the local water company. Artificiallysoftened water must not be used to fill the central heating system. An isolating valve should be fitted to allowfor servicing.There must be no connection to the mains without theapproval of the local water company. All connections inthe system must be capable of withstanding a pressureof up to 3 bar and the radiator valves conform to therequirements of BS 2767:10.If any system water treatment is required then onlyproducts suitable for use with Aluminium shall beused i.e Fernox- Copal or Sentinal X100, inaccordance with the manufacturers instructions.The use of any other substances will invalidate theguarantee. The pH value of the system water mustbe less than 8 or the appliance guarantee will beinvalidated.A drain cock to BS2879 must be fitted to the lowestpoint of the system.IMPORTANT: Check that no dirt is left in the waterpipework as this could damage the appliance.Thoroughly flush the heating system and the mainswater supply before fitting the appliance to the wallin accordance with the recommendations ofBS7593:1992.Devices, such as water meters or back-flow prevention valves, capable of preventing the flow of expansion water must not be fitted unless separatearrangements have been made.A Zilmet Z160 expansion vessel is the preferred type. Athread sealant compatible with potable water must beused.126 720 610 576 GB (02.05)

InstallationAPPLIANCERefer to Fig.1Appliancewater flowdiagramA drain cock should be fitted atthe lowest point of the heatingcircuit and the applianceWRC approvedfilling loopLockshieldvalveCentral heating returnDomestichot waterCentral heating flowRadiatorvalveBS stop valve.Fixed spindle typeWatermainFig. 56 720 610 576 -09.2OSealed primary water oseunionHoseunionTestcockTestcockTemporary hose6 720 610 576 - 10.1OFig. 6Sealed primary water system - filling method3.4Siting the applianceRegulations concerning the Installation SiteSurface temperatureB Relevant national regulations must be complied withsection 3.9.1.The max. surface temperature of the casing and the flueis less than 85 C.This means that, no special safety precautions arerequired with regard to flammable building materialsand fitted furniture. The specified clearences must bemaintained.B Consult the installation instructions for details of minimum clearances required.Combustion airIn order to prevent corrosion, the combustion air mustnot contain any corrosive substances.Substances classed as corrosion-promoting includehalogenated hydrocarbons which contain chlorine andfluorine compounds and are contained in some solvents, paints, adhesives, aerosol propellants and household cleaners, for example.6 720 610 576 GB (02.05)Cupboard/CompartmentThe appliance can be installed in a cupboard/compartment need for airing clothes providing that the requirements of BS6798 and BS5440:2 are followed. The lowcasing losses from the appliance eliminate the need forventilation openings in the compartment.13

Installation3.5Wall mounting frame assemblyB Take the wall mounting frame out of the package andscrew together with 6 screws as shown in fig. 7. Usethe inner lugs on the top and bottom horizontalsections for the appliances that are 440 mm wide.B Screw the pre-plumbing manifold with two screws tothe wall mounting frame.6 720 610 576-11.1OFig. 96 720 610 576-04.1O3.6Pre-piping the systemFig. 7200B Hold the wall-mounting frame against the wallensuring that it is vertical.B Mark the position of the flue duct hole if a rear flue isto be used. Refer to fig. 1 and 15.B Mark the holes for the wall mounting frame onto thewall, drill and plug the holes and screw the wallmounting frame to the wall with the screws provided.17111217243473550120-1302606 720 610 576-06.1OFig. 10 Manifold43471121711726 720 610 576-05.1OFig. 814CH flowCH returnGas cockDomestic hot waterCold water reliefB A drain tap should be fitted at the lowest point of thecentral heating system.B WRc filling loop must be fitted.6 720 610 576 GB (02.05)

Installation3.7Condensate drainFitting the appliancePrepare the condensate discharge system. Refer tofig. 11. The condensate drainage pipe should be astandard drain pipe material , i . e. PVC, PVC-U, ABSetc. and should be at least 22 mm in diameter.Benchmark: For optimum performanceafter installation, this boiler and its associated central heating system must beflushed in accordance with the guidelines given in BS5793:1992 “Treatmentof water in domestic hot water centralheating systems”.A siphon with a 75 mm condensate seal is fitted withinthe appliance.A connection to an internal drain is recommended.Any external drain pipe should be insulated to preventfreezing.The connection of a condensate pipe to a drain may besubject to local building regulations.For more information refer to the CIBSE Guide,BS5546 and the Building Regulations.B Remove packing, taking care to observe the instructions on the packing.B Lie the boiler on its back.Removing the outer caseThe outer case is secured against unauthorised removal by two clips (electricalsafety).Always secure the outer case with thoseclips again after refitting.iB Turn the clips with a screwdriver (1.).B Slide the outer case upwards and then forwards toremove (2.).B Remove the plastic caps from the boiler connections.2.1.6 720 610 602 - 03.1OFig. 11 Position of the condensate drain6 720 610 332-07.1RFig. 12Fixing the applianceB Fit the washers onto the gas and water connections.B Lift the boiler onto the wall-mounting frame. The lugspass through the rectangular holes in the boiler backpanel.B Take care not to disturb the washers on the connections.6 720 610 576 GB (02.05)15

InstallationConnecting the flue duct3.9B Fit flue duct connector onto appliance flue spigot.The only flue systems that may be used are those supplied by Worcester Heat Systems.The flue system must be installed in accordance withthe requirements of BS5440:1.B Secure with the two screws supplied.Flue SystemsStandard 100 mm flue system12The standard concentric flue system provides for a horizontal length of upto 4 m. Full instructions for fitting thisflue are in Subsection 3.9.2 “Installation of the flue”.34Alternative 125 mm diameter flue systemsInstallation instructions for the alternative flue systemsare sent with the appropriate flue kit.Systems are available to give a maximum horizontallength of 13 m.6 720 610 332-09.1RFig. 13B For remaining installation of flue assembly, refer tothe relevant installation instructions.3.8A vertical flue system upto a height of 15 metres is available.45 and 90 flue bends can be used with a corresponding reduction in flue length of 2m for each 90 bend and1 m for each 45 bend used.Checking the connectionsWater connectionsB Check that the O-rings or seals are in place beforetightening the connection.B Turn on the service valves for central heating flowand return and fill the heating system through a WRCapproved filling loop.IMPORTANT: Any horizontal flue system fitted to a condensing boiler must incline towards the appliance at anangle of 3 % (30 mm per metre length) to prevent condensate dripping from the flue terminal. This meansthat the clearance above the appliance must beincreased to match the duct length.Refer to fig. 1 on page 5.B Check all seals and unions for leaks (testing pressuremax. 3.0 bar as indicated by pressure gauge).B Turn on cold water service cock and fill hot water system (testing pressure max. 10 bar).B Check all connections for leaks.Gas supply pipeB Check that the seal is in place before tightening theconnection.B Turn off gas cock to protect gas valve againstdamage from excessive pressure.B Check gas supply pipe.B Release the pressure on the gas supply pipe.166 720 610 576 GB (02.05)

Installation3.9.1 Siting the Flue TerminalThe flue must be installed in accordance withBS 5440:1 and the Building Regulations. Flue terminalsin carports and under balconies are to be avoided.The terminal must be positioned so that it does notcause an obstruction nor the combustion products anuisance. See fig. 14 and table 9.The terminal will, at times, give out a plume of watervapour and consideration must be given to this whenchoosing a terminal position. Keep clear of securitylighting, activated by passive infra-red sensing heads.If the terminal is less than 2 m above a surface to whichpeople have access then a guard must be fitted. Theguard must be evenly spaced about the terminal with aspace of 50 mm in each direction and fixed with platedscrews.A guard Type K2 for the standard horizontal flue, can beobtained from Tower Flue Components, Vale Rise, Tonbridge TN9 1TB.Fig. 14Minimum dimensions of flue terminal positions (all types) (see fig. 14)DimensionTerminal Position (kW input expressed in net)A1)Balanced flues room sealed: Fanned draughtDirectly below an opening, air brick, opening windows, etc.300 mmB1)Above an opening, air brick, opening window, etc.300 mmC1)Horizontally to an opening, air brick, opening window, etc.300 mmDBelow gutters, soil pipes or drain pipesEBelow eaves200 mm75 mmFBelow balconies or car port roof200 mmGFrom a vertical drain pipe or soil pipe150 mmHFrom an internal or external corner300 mmIAbove ground roof or balcony level300 mmJFrom a surface facing the terminal600 mmKFrom a terminal facing the terminal1200 mmLFrom an opening in the car port (e. g. door, window) into the dwelling1200 mmMVertically from a terminal on the same wall1500mmNHorizontally from a terminal on the same wallOFrom the wall on which the terminal is mountedNot applicablePFrom a vertical structure on the roofNot applicableQAbove intersection with roofNot applicable300 mmTable 91)In addition, the terminal should not be nearer than 150 mm (fanned draught) to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window frame.6 720 610 576 GB (02.05)17

Installation3.9.2Installation of the flueThe standard 100 mm diameter horizontal flue system issuitable for lengths upto 4 m.Flues upto 650 mm do not require an extension ductassembly.Flues between 1600 mm and 4000 mm require extension duct assemblies.NOTE: Flue lengths between 650 mm and 730 mmca

GREENSTAR HE combi Wall mounted condensing boiler for central heating and mains fed domestic hot water 6 720 610 577-00.10 ZWB 7-27 HE combi GC-Number: 47 311 55 6 720 610 576 GB (02.05) OSW. 2 6 720 610 576 GB (02.05) Contents Contents Sa

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