VOKERA Neutro Release note

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.

We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(replacingBS7566whichhasbeenwithdrawn)asanalternativemeanstoachievean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.

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 
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 

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
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


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equipment)and
subsequentamendments,andalreadyinlinewiththedraftofEuropeanstandardBSEN14785
(pellet‐heatinghouseholdequipment).

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[m3]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/hm3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density(=600kg/m30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heatermusthavehighqualitycharacteristicssuchas,those
definedbystandardsDIN51731andÖNORMM7135,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D1<505xD1
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

1Notmorethan20%ofthepelletmayhavealengthgreaterthan7.5timesitsdiameterD.

2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residual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brazier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cm2;
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using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flues.

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installed,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valve(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standard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calculation
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.
M
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.