VOKERA Neutro Biomass Pellet Boiler User manual

Installation

& Servicing

Instructions

THESE INSTRUCTIONS

TO BE RETAINED

BY USER

Vokèra is a licensed member of the Benchmark scheme

which aims to improve the standards of installation and

commissioning of domestic hot water systems in the UK.

Neutro

Wood pellet boiler

DearCustomer



Firstofallwewouldliketothankyouforthetrustyouhaveplacedinuswhenpurchasingoneof

ourproducts.



Wehavepreparedthisshortmanualforyouinanattempttomakeitaseasyaspossibleforyou

touseourproduct.



 also advise youtoshowthespecifictechnicalinformation given onthefollowing pages to

those in charge of assembling the unit and making the product operational so that these

operationscanbecarriedoutascorrectlyaspossible.



LISTOFCONTENTS

Chapter1Introduction



1.1 Productsizeandconstructionfeatures

1.2 Producttechnicalfeatures

1.3 Fuelfeatures



Chapter2Installation



2.1 Indoorpositioning

2.2 Fumeextractionfluefeatures

2.2.1 Outsidewallextraction

2.2.2 Roofextractionbymeansoftraditionalflue

2.3 Hydraulicconnectionfeatures

2.4 Controlboardwiringdiagram

2.5

Productcoveringassemblyinstructions



Chapter3Useoftheproduct



3.1 Controlpanel

3.2 Lightingforthefirsttime

3.3 Conditionsforuse

3.4 Safetydevices

3.5 Usermenu

3.6 One‐wayradiocontrol



Chapter4Maintenance



4.1 Scheduledmaintenance

4.2 Yearlymaintenance

4.3 Unscheduledmaintenance

4.4 Troubleshooting

Theseinstructionscoverthebasicprinciplestoensurethesatisfactoryinstallationofthe

stove,althoughdetailmayneedslightmodificationtosuitparticularlocalsiteconditions.

InallcasestheinstallationmustcomplywithcurrentBuildingRegulations,LocalAuthority

Byelawsandotherspecificationsorregulationsastheyaffecttheinstallationof

thestove.

ItshouldbenotedthattheBuildingRegulationsrequirementsmaybemetbyadoptingthe

relevantrecommendationsgiveninBritishStandardsBS8303,BS6461andEN12391‐1

(replacingBS7566whichhasbeenwithdrawn)asanalternativemeanstoachievean

equivalentlevelofperformanceto

thatobtainedfollowing theguidancegiveninApproved

DocumentJ.



PleasenotethatitisalegalrequirementunderEngland andWalesBuildingRegulationsthat

theinstallationofthestoveiseithercarriedoutunderLocalAuthorityBuildingControl

approvalorisinstalledbyaCompetentPersonregisteredwitha

Governmentapproved

CompetentPersonsScheme.HETASLtdoperatesuchaSchemeandalistingoftheir

RegisteredCompetentPersonscanbefoundontheirwebsiteat

www.hetas.co.uk.



PREAMBLE



Wewouldliketohelpyouunderstandourmanualbylistingbrieflythemeaningofthesymbols

characterisingthemostimportantandsignificantinformationgiven:



 Warningsandsafety



Importantinformation



Themanufacturerdeclinesanyliabilityforanydamagecausedtopeopleorpropertybecauseof 

failuretoobservethesimplerulesofinstallationanduse,describedin thismanual.



You are also reminded that in installing the product you must observe relevant national and

localbuildingregulations.



Inpursuingcontinuousimprovement ofitsproductsandcustomersatisfaction,the

manufacturerreservestherighttomakeallnecessarymodificationstoimprovethequalitylevel

ofitsproducts,withoutpriornotice.



1. INTRODUCTION



1.1PRODUCTSIZEANDCONSTRUCTIONFEATURES



Weshowbelowthemaindimensionsofthepelletheater.





 



 





TypicalDimensions

Height 1015mm

Width 580mm

Depth 585mm

Weight 230kg

Fumeoutletdiameter 80mm

Airintakediameter 45mm

Waterpipediameter ¾”

Tankcapacity 28kg

Boilercapacity 10litres

Figure1.1.: Productsize

1.2 PRODUCTTECHNICALFEATURES

Our products are in conformity with BS EN 13240/2001 (solid‐fuel household equipmen t) and

subsequentamendments,andalreadyinlinewiththedraftofEuropeanstandardBSEN14785

(pellet‐heatinghouseholdequipmen t).



Theyarealsoinaccordancewithlegalprovisions,thatincorporatethefollowingdirectives:



‐ 89/336EEC(EMCdirective)andsubsequentamendments;

‐ 73/23EEC(lowvoltagedirective)andsubsequentamendments;

‐ 89/106EEC(fitnessforuse)andsubsequentamendments.

Belowisashortandsimplenoteonthemainperformancesandfittingsofourproduct:



PERFORMANCE

Min 4.7Ratedheatinput[kW]

Max 14.5

Min 3.5Overallheatoutput[kW]

Max 11.9

Min 3Outputtoheatingsystem[kW]



Max 10.3

Min 0.5OutputDirecttoroom[kW]

Max 1.6

Start‐Up 352Powerrequirements[W]

Rated 154

Maximumworkingwater

pressure[bar]

2

Maximumtemperatureinside

theboiler(°C)

80

CombustiongastemperatureºC 170

Massflowofgasesburnt[g/s] 14.8

Minimumdraught[Pa] 10

COvalues[%] <0.04

Max.heatablevolume[m

] 320*

Min 73.5Overallefficiency[%]



Max 81.5

Min 1Pelletconsumption[kg/h]

Max 3.1

atnominalflow 9Autonomy[h]

atminimum 28

Boilercapacity[litres] 10

MAINFITTINGS

Controlledcombustionsystemwithfumetemperaturerecovery Serial

Fumedraughtcontrolpressurestat Serial

Dualcombustionsystem Serial

Airtightchamberoperation Serial

Self‐cleaningglass Serial

One‐wayradiocontrol Serial

Automaticrelightingintheeventofblackout Serial

Possibilityofsettingpower(5levels) Serial

Weeklyprogrammer Serial

Two‐wayradiocontrol Optional

GSMmodule Optional

*values calculated on the basis of act 10/91 for rooms with thermal requirement of 30 kcal/hm

 and

heightof3m.Thedatagivenaboveareapproximate;theproducercompanyreservestherighttomake

anychangeinordertoimprovetheproduct’sperformance.



The results in the table were obtained using certified pellet based on Austrian and German

standardsDIN51731,DINPLUSandÖNORMM7135.

You are reminded that the ESC (European Standardisation Committee) is in the process of

definingfutureEuropeantechnicalstandardsthatwillgovernboththetechnicalfeaturesof

this

fuelandtheeconomicandenvironmentalaspectsassociatedwiththeproductionline.



1.3 Fuelfeatures 

The main feature of this heater is that it burns a natural fuel (the pellet) obtained in an

environmentally‐friendly way from scraps of the timber industry (wood chippings, sawdust,

etc.).



Woodchippingsandsawdustfromwoodproducts,afterhavingbeendulyre‐cleanedanddried,

are

compactedinstate‐of‐the‐artveryhigh‐pressureplants,intopureroundedwoodpieces:the

pellet.Eachroundedpiececanhavevariablelengthsandthicknesses,respectivelybetween1÷3

cm in length and 6÷8 mm in diameter. The pellet’s main features are low moisture content

(below 12%), its high de nsity  (=600

 kg/m

0 as well as its regularity and compactness that give

thistypeoffuelcharacteristicsofhighcalorificpower(I.C.P.4000÷5000kcal/kg).



Figure1.1:Woodinpelletform.

The pellet to be used to feed the hea ter must have  high quality characteristics such as, those

defined by standards DIN 51731 and ÖNORM M 71 35, some basic details of which we set out

below.



Qualitystandardfor

woodinpelletform

Unitofmeasurement



ÖnormM7135



DIN51731



DINplus

Diameter Mm from4to10 from4to10 from4to10

Length Mm 5xD

<50 5xD

Density Kg/dm3 >1,12 1,0/1,4 >1,12

MoistureContent % <10 <12 <10

Ashes % <0,50 <1,50 <0,50

CalorificPower Kwh/kg >5 4.86/5.42 >5

Sulphur % <0,04 <0,08 <0,04

Nitrogen % <0,3 <0,3 <0,3

Chlorine % <0,02 <0,03 <0,02

Powders %weight <2,3‐ <2,3

Bindingagents %ofpressedmass <2 2 <2





Notmorethan20%ofthepelletmayhavealengthgreaterthan7.5timesitsdiameterD.



TheDINprohibitstheuseofanyaddedsubstance.However,thisprohibitionisnotvalidforsmallheatingsystems.



DINplusproposesthecombinationofthequalitativeparametersproposedbystandardDIN

51731andbyAustrianstandardÖnormM7135.



Thepellet,asalsostipulatedbycurrentItalianlegislationgoverningthecommercial

technology characteristics of fuels (DPCM 2.10.1995) must be produced exclusively with

untreatedwoodchippings,withnootheraddedmaterials.



 Itisstrictlyprohibitedtouseanysolidorliquidfuelotherthanthepelletto

feedthestove.



 Inordertooptimisetheuseoftheproductwerecommendusingpelletswhich

havebeen given a quality certificate by an authorised body. The use of pellets other 

than those directed by the installer may lead to heater malfunction and to the

guaranteebecominginvalid.



Storingandevenmoving

thepelletsareimportantoperationstobecarriedoutwithcare:



•Thefuelmustbestoredinadryplaceawayfromcold;

•Thepelletsmustbemovedsoastoavoidexcessive   

crumblingintofinedust.



Observance of these two simple rules makes it possible

both to obtain better fuel

efficiencyandtopreservethemechanicalmovingpartsoftheapparatus.



Iftheproductiskeptoutofserviceforlongperiodsoftime(overfifteendays),the

tankmustbeemptiedofanyresi dual fuel,inordertopreventanyexcessive

dampnessofthefuelcausingtheproducttomalfunction.



Ahighmoisturecontentinthepelletmaycauseittocrumbleintodust,thatcreates

agreateraccumulationofresidueinthebr azierareaandblockageofthefuelfeed

system(auger).



2INSTALLATIONINS. 

Foracorrectinstallationoftheheaterandtopreventtheuprisingofpossibleproblemsduring

running the heater, we are supplying some simple recommendations for the installation –

accordingtoregulationsUNI10683,UNI9615,UNI9731,UNI‐CIG7129andfollowingupdating

referredtodomestic

gasuseunits.



2.1Indoorpositioning



Ourproductisaheaterthatdrawsairthatisnecessaryforitscombustionprocessdirectlyfrom 

theenvironmenttobeheated.

For this reason and for the even more important reason of safety for the people using it, the

heater must be  installed in a sufficiently ventilated place in

order to guarantee a continuous

flowofairatalltimes.



Itisthereforeessentialtomakeairventsconnectedtotheoutside.Seeexampleinfigure2.1



DetailA



Figure2.1:Exampleofmakinganairvent.



IncompliancewiththeindicationsreportedunderregulationUNI10683,the

airinletsmusthavethefollowingfeatures:

1.Theymusthaveaclearspaceofnotlessthan80cm

;

2.Theymustbemadeataheightclosetothefloor;

3.They must be suitably protected by a wire mesh or grille in such a way

thattheminimumpassagespaceisnotandmaynotbereduced;

4.They must be placed in such a way that they are not

 obstructed in

anyway.



The correct inflow of fresh air may be guaranteed by usi ng apertures

 towardsanadjacentroom,providedthatithasdirectventilation,and

itisnotanenvironmentwithafirehazard,suchas store‐rooms, garages

or warehouses,asregulatedbyregulationUNI10683



Our heater should be installed

 in rooms where there is no equipment operating in airtight

conditions inrelation tothe room, or apparatusthat may place  the roomitself ina vacuum in

relationtotheoutsideenvironmentandthuscauseproblemsofpoordraughtforourproduct(

regulationUNI10683).



Combustionproductsfromourheatermustnotbeextractedintosharedfl ues.



Whencheckingequipmentcompatibility,itisgoodpracticetocheckwhetherthesupportplane

(floor)hasa bearing capacity (kg)that is suitedto theweightof theproduct itmustsustain. If

not,correctsafetymeasuresmustbetaken(eg.Load‐distributionplate).



Wheninstalling

theheater,itisadvisabletoplanasuitabledistancefromthewallsoftheroom

inordertoprovideanyaccessnecessarybothintherear(atleast20cmisrecommended)and

to the side of the product (80 cm is recommended) (for example to carry out appropriate

cleaning

workcorrectly).



Havingplaced theoutermostoverall part ofthe heaterat adistance of80 cmfrom

combustible and/or flammable material, if this distance cannot be maintained it is

useful to arrange for heat protection to be provided ( regulations UNI 7129 , UNI

10683)



Do not get close to, and above all do not touch with flammable material the outer

surfaces of the combustion chamber that, after continuous product use, may reach

hightemperatures.

Once the installation has been completed , pay attention in placing the

power switch in a position which will allows an easy and comfortable

access.



If the floor is made of combustible material (eg. parquet), it is advisable to protect it using a

sheetofnon‐combustiblematerialplacedunderneathandaroundtheheater.



Figure2.2:Positioningdistances.



2.2Fumeextractionfluefeatures



Themainfeaturescharacterisingthefumeextractionfluearegiven.Theyarebasedonwhatis

setoutinstandardsUNI7129andUNI10683/98:



‐ Inspectionvalves(I);

‐ Minimum height of the pipe directly connected to the heater fume extraction outlet

mustbebetween2‐3m;

‐ If

itisnecessarytohaveahorizontalsection,itisadvisabletomakeitwith amaximum

lengthof1.5mandwithaninclineof3‐5%inordertohelpthefumestoescape;

‐ Useofacowlthatiswind‐resistantand rain‐resistantinorderto

avoidachangeinthe

slightconditionofoverpressuretheflueisin,(itisstronglyrecommendednottousea

horizontalsectionattheendoftheflue).



 The reduction in pressure in the flue is necessary so as to help the normal flow of

fumes from the combustion chamber towards the outside, in the event of a mains

powercut.



 Remember that excess heat disposal is managed in an optimum way from the

electroniccontrolpanel(modulation,switch‐offstage,etc.).



‐ Flues must be made of appropriate materials to resist combustionproducts and

condensation(theinspectionvalvesshouldallowtodischargepossiblecondensation)



‐ The flues must be manufactured

 in order to insure the maximum smoke resistance

(regulationUNI10683/98)



‐ Ductinsulationparticularlyontheoutsidepartexposedtotheweather.



 Avoidmakingcompletelyhorizontalsections.



Figure2.3:Fumeextractionflue



 Intheroomwheretheheatgeneratormustbeinstalled,theremustbenofume‐

extractionhoodsalreadyinexistenceorinstall ed,inordertoavoiddepressingthe

atmosphere.



 Theairventsmustnotbeclosed.



 Keeptheflueclean,performingacleaningoperationatleastonceayear;itisalso

advisabletocleanboththefluecowlandthefumepipeconnection.



2.2.1Outsidewallextraction



Oneoftheinstallationsolutionsthatmaybeadoptedisthatofplacingthepelletheatercloseto

anoutsidewalloftheroomsothatthefumesareextracteddirectlytotheoutside(figure2.4).

Hereafter please find some recommendations reported under regulation UNI 7129 referred to

thisparticular

plant:



‐ Always guarantee that there is an inspection va lve (I) that will allow effective and

periodiccleaningtobecarriedout,andanycondensationformedtobeeliminated;



‐ Thecowl(T)mustbestrictlywindproofandrainproof;



‐ Insulatethefumeextractionflueappropriatelyinthesectionwhereitgoes

throughthe

wall.



Thefumeextractionfluethatiscompletelyoutsidemustbemadeofdouble‐wallstainlesssteel

in order to guarantee that there is both greater resistance to atmospheric agents and correct

fumeextractiontemperature.



Figure2.4:Outsidewallextraction



2.2.2Roofextractionbymeansofatraditionalflue



Pelletcombustionfumesmaybeextractedalsousingapre‐existingtraditionalflue(figure2.5),

providedthatitismadetostandard(refertostandardUNI10683).Belowisa shortlistofsome

ofthemainfeaturesgiveninthestanda rdthatcharacteriseagoodchimney(C):



‐ Suitable insulation

 and proofing particularly in its outer section that is exposed to the

weather;



‐ Uniforminternalsection(theremustbenosectionrestrictions);



‐ Made of material that is resistant to high temperatures, the action of combustion

productsandthecorrosiveactionofanycondensationformed;



‐ Predominantlyverticalcoursewith

deviationsfromtheaxisofnomore than45°;



Itisadvisabletoprovideforachambertocollectsolidmatterandanycondensation(R)thatcan

beinspectedbymeansofanairtightwindow(I).



Figure2.5:Extractionbymeansofatraditionalflue.



WerecommendtofollowindicationsreportedunderregulationsUNI9615and9731referredto

dimensionsofthechimney(C)andhowevertoavoidusingsectionssmallerthan100mm.

In the case where there are larger sections, it is necessary to insert a steel pipe (A) inside

the

masonryone(C),asshowninfigure2.6.







Thesteelfluepipemustbesuitableinsulatedwithahightemperature‐resistantrock

woolorvermiculitematerial(B).



Figure2.6:Exampleofextractionflueconnection.



Inthecaseoffireintheextractionflueorduct,switchoffthe heater

immediatelyanddisconnectitfromthehousemainspowersupply.



2.3ConnectiontoCentralheatingsystem



Inordertobeabletooperate,theheatermustbe suitablyconnectedtoaheatingsystem.For

this type of installation also, some simple suggestions are provided that will undoubtedly be

helpfulwheninstallingtheproduct(refertoregulationUNI10412andfollowingup‐dating)



 Thedrainagecockisplacedatthelowestpointofthewatercircuit.



 Werecommendtoinstalltheballvalveonthedeliverywaterpipeandonthereturn

waterpipe(pleaserefertotheenclosedschematicdrawing).Thiswillenableaquick

andeasymaintenanceoperationincaseofneed.



Allwaterheatinginstallationsshouldbedesigned,beforeproductinstallation,

andinstalledbya

competentheatingengineerinaccordancewithBS5449:1990;CodeofPracticeforCentral

HeatingSystemsforDomesticPremises.Furtherguidanceisavailablefromthefollowing

sources:BSEN14336:2004HeatingSystemsinBuildings.Installationandcommissioningof

waterbasedheatingsystems.BSEN12828:

2003;HeatingSystemsinBuildings.Designofwater

basedheatingsystems.BSEN12831:2003;HeatingSystemsinBuildings.Methodforcal culation

ofthedesignheatload.



 The ball valve mounted on the inlet pipe must be open in normal system operating

conditionsinordertoallowwatertobeaddedtotheboiler.Itmaybeclosedwhenit

isnecessarytodrainthesystem.



Thedeliveryandreturnpipeshaveadiameterof¾".



 Thecorrectfunctioningofthe“expansionboxopen”requiresthattheexpansionbox

isplacedataheightnotlessthan7metersinrespecttothestove.



Theexpansionvesselmustbemadeofacoveredvessellocatedabovethehighestpointreached

bythewaterin

thesystem.



Thesafety,inletandoutletpipesmustbeprotectedfromicewherethismayoccur.



The safety pipe must allow the highest part of the generator to be in contact with the

atmosphere and not have reverse gradients, except for the section intended to lead into the

upper

partoftheexpansionvessel.



Theinletpipemustallowthelowestpartofthegeneratortobeincontactwiththelowestpart

of the expansion vessel and must not have reverse gradients capable of preventing circulation

bygravityinthecircuit(safetyandinletpipes,stove,expansionvessel).



The outlet pipe in contact with the outside must have a section at least equal to that of the

safetypipe.Theoverflowpipemayalsobeusedasanoutletpipeprovidedthatithas asection

notsmallerthanthatofthesafetypipe.



 Ourgeneratormustnotbemountedinsideclosedexpansionvesselcircuits.



2.4Controlboardwiringdiagram



 Forgeneralpurposes,thediagramofthecontrolboardinputandoutputconnections

isgiven.Thisdiagramisexpresslyintendedforthetechnicalpersonnelinchargeofinstallation

andmaintenance.



 Formountingourproductparalleltoatraditionalgasboiler,accordingtothediagram

shownitisnecessarytoconnectathree‐wayvalveonthesamepins(15and16)usedforthe

recirculationpump.

Figure 2.9: Controlboardwiringdiagram



2.5Instructionsformountingproductcovering



Formountingtheoutercovering, simpleinstructions areprovided:



1. Useacrossheadscrewdriver.

2. Liftthetop(1),removethetwoscrewsholdingthedisplay.

Takecarewhenmovingthe topinordertoavoiddamaging or disconnecting theflat

connectingcablebetweentheboardandthe

display

3. Liftthesidepanelontherighthandside(2).

4. Repeatthesameprocessonthelefthandside.

5. Dismountthelowerpanel(3)removethescrewplacedonthebaseofthefrontdoor,

removethecarter.



Figure2.10:Pelletheater–instructionsformountingproduct



5. Forsomemodelsitmightbenecessarytoliftandmovethesheet‐metaltopofthe

heatersidewaysinordertoinsertthesidemajolicatiles.



3.0 MAINTENANCE



3.1 SCHEDULEDMAINTENANCE



It is necessary to perform periodic maintenance of the heater in order to ensure constantly

correctandeffectiveoperation.

VOKERA Neutro Biomass Pellet Boiler User manual

Related papers

Other documents