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TECHNICALDESCRIPTION
Theboilerbody–(1)comprisesweldedsteelmetalsheetsof4and5mmthickness.Theheat
exchangerextendsdowntothebaseofthecombustionchamber'ssideandrearwallsgiving
lowerappliancecasingtemperatures.Thetopoftheheatexchangeriscarefullydesignedto
extractthemaximumheatfromthefluegas.Thecombustiongaspassesthroughtwoparallel
channelsofrectangularprofilewhichhousethreemovablecleaningvanes(7)ineachchannel
thatarelinkedtothedamperrod.Acoolingloopisincorporatedintotheupperpartoftheheat
exchangerwithtwoconnectionsattherear(9).
Thecombustionchamberislinedwithmoulded,highquality,ceramicinsulationwhich
incorporatesreinforcingfibresofheatresistantsteel.Theinsulationlinesthecombustion
chamber'srearwall.Theyaregroovedtodirectthepre‐heatedtertiaryair.Thefrontofthe
fireplaceisequippedwithafuelbarmadeofheatresistantsteel(16)tocontainthefuel.
Themovablegrateisoperatedbytheriddlingrod(12)causingtheashtofallandbecollected
bytheashpan.Withtheriddlingrodextended,additionalairpassesthroughthegrate(18)
duringlightingoftheappliance.
Atthetopofthecombustionchamberadamperiscontrolledbythedamperrod(13).During
lighting,thedamperrodisextendedallowingthefluewaystoopenprovidingminimal
restrictionoffluegases.
Therearstokingmodelhasriddlingrodanddamperattherear,allowingittobestokedand
cleanedfromtherear.Theashpanisaccessiblefromtherearonly,withthefrontaperture
blankedoff(31).Thedoorshaveahollowframeandtheairwashwhichkeepstheglassfreeof
sootissuppliedthroughtheframe.Therearetwoholeswithslidersprovidingairwashflowand
thesecanbeadjustedtoincreasetheflowduringlightingorduringdifferentstatesofoutput.
Thelargeceramicglass,withtemperatureresistanceupto800°C,hasaspeciallayerthat
reflectsthermalradiation.Thisincreasestheproportionoftheheatoutputwhichisdirected
intothecentralheatingsystem.Thestokingopeninghasahingedsteelplatealongitsupper
edgewhichpreventssmokespillageintotheroomduringstoking.
Thestokingdoorcanbereversedsothatithingesontheoppositeside.
Heatoutputregulationiscontrolledbyamechanicalthermostaticactuator(6)coupledtoaflue
gastemperaturesensor(21).Thisoperatesaflapontheairintake.Outputisadjustedbya
wheel(27).
Thestableheatregulatorisequippedwithaservomotor(28),whichclosesaflapontheair
intake.Theservomotorisenergised(closingtheflap),ifthefluegastemperaturedropsbelow
thevaluesetonthestableheatthermostat(23)bythestableheatregulationwheel(25),orif
thewatertemperatureexceedsthevalueadjustedontheemergencythermostat(22).Closing
oftheflapisshownbytheretractionoftheindicator(26).Normaloutputcontrolisrestoredby
manuallypullingouttheindicatorwhichwillre‐opentheflap.
Asafevoltageof12Vissuppliedtotheboiler.Thepowersupply(mainsadapter12V‐1A)is
connectedtotheboilerwitha4mlongcablewhichmustnotbeshortened.
Surfacetreatmentofthermallyexposedparts(doors,ashpan,cookingplates)isprovidedbya
heatresistantcoatingofmattblackpaint.Thesurfacetreatmentofotherexternalboilerparts
(sides,frontandtopcovers)isprovidedbypowdercoatedenamel.