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520F0618 DKBD.PC.021.A3.02 1
New Oil Burner ControlsBHO 70 SeriesTechnical Information
Introduction
Existing Type New Type Remarks
BHO64BHO71.10 One-stagesystemBHO72.10 Two-stagesystem
BHO64.1 BHO72.11 Two-stagesystem,shortprepurge/longpost-ignition
BHO64A BHO73.10 Two-stagesystem,shortpost-ignition(terminals6and7)
LOA44 BHO74.10 Two-stageburnersabove30kg/h+WLE
Programme
Danfossintroducesanewseriesofelectronicoilburnercontrolsforcontrolofoneandtwo-stageoilburnerswithintermittentduty,prepurge,pre-ignitionandpost-ignition.
ThenewseriesreplacestheexistingtypesintheBHO64seriesandtheLOA44andiscompatiblewiththese.Thenewburnercontrolsarecon-structedcompletelyelectronicallywithadoublemicrocontrollerasthecentralcontrolunitandareequippedwithrelaysonalloutlets.
Theburnercontrolconsistsofanupperpartcontainingthementionedsteeringcomponentsandabasecontainingtheelectricalconnections.Thetwopartsareconnectedelectricallywithcircuitconnectorsandheldtogetherphysicallybyaspringsystemasontheexistingburnercontrols.
AlltypesinthenewseriesmeetEN230:2005asregardtoundervoltageprotectionandotherthings.ThenewseriesofburnercontrolsalsocomplieswiththeRoHSdirectiveandislead-freethroughout.
BHO71,BHO72andBHO73areforburnersupto30kg/h,BHO74isforburnersabove30kg/handhot-airaggregates(WLE).
BHO71isespeciallyforone-stageburners,whereasBHO72,BHO73andBHO74areforbothoneandtwo-stageburners.Alltypescanbeusedforburnerswithorwithoutapreheater.
Aprogrammeofnewflamesensors(photounits)typesLDandLDSforflamemonitoringofyellow-flameburnersbelongstotheseries.
Specificationsandcodenumbersofthesensorsarethesameastheexistingtypes.Thismeansthattheflamecurrentsignalislikethatofitspredecessorsandcanbemeasuredwiththesametoolsandinthesameway.Whenchangingaburnercontrol,itis,however,recommendedtoreplacethesensor,whereasthebasecanbereused,ifitisintact.
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.022
Symbols
Normal start
Function
WhenthethermostatTRmakescontact,volt-ageisappliedtoterminal1.Ifnooilpreheaterisused,terminals8and3mustbelinked.Ifthereisanoilpreheater,itreceivesvoltageonterminal8.WhenthepreheaterthermostatOTRmakescon-nectiontoterminal3,theburnermotorstarts.Atthesametime,theprogrammeoftheburnercontrolstartstheprepurgetimeandtheignitioniscut-in.
Attheendoftheprepurgetime,itischeckedthattheflamesignalwithcertaintyindicatesdarkness.HereaftertheprogrammeforthesafetytimestartsandopensupforV1.
Whentheflameisregisteredbythephotounit,arelay,forminganinternalconnectionbetweenterminals3and8,ispulledin,sothatthepre-heaterthermostatnolongerneedstobepulledintokeeptheburnerrunning.
Afterafewseconds,theignitioniscutoutandtheoilburnerisinoperation.Inthecaseoftwo-stageoperation,V2opens5-20secondsafterV1,dependentonthetype.Nowitisthethermostatthatdetermineswhentheoperatingperiodends.
Falselightduringstart-upisregisteredatthefinalstageoftheprepurgetime.Intheeventoffalselight,theburnercontrolwilllockout.
False light during start or missing establishment of flame
Ifasatisfactoryflamesignalisnotobtained,orthesafetylockouttimehaselapsed,theburnercontrolwilllockout.
Thesymbolsbelowareusedforexplainingtheindividualelectricaltablesoffunctions.
Boilerthermostat
Hightemperaturecut-out
Ignition
Burnermotor
Solenoidvalve
Flamesensor
Externalalarm
Phaselead
Neutrallead
Oilpreheater
Oilpreheaterthermostat
Relay
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.02 3
Undervoltage protection TheBHO70seriesisundervoltageprotectedinaccordancewithEN230:2005.Thismeansthatthecontrol,whateverthevalueofsupplyvoltage,willalwaysbeabletoperformareliablemonitor-ingoftheburner.Theconditionofstartforthecontrolisaminimumsupplyvoltageof185V.
Ifsupplyvoltagefallsbelow170Vduringopera-tion,thecontrolwillcutouttheburnerandawaitforthesupplyvoltagetoriseagain.Whenthesupplyvoltagereachesabove180V,thecontrolwillstarttheburnerasnormal.
Flame failure during operation
Iftheflamefailureisregisteredduringopera-tion,theoilsupplyiscutoffandtheburnerisrestarted.
Incaseofmorethanthreeflamefailuresduringthesameoperatingperiod(BHO74.10,onlyoneflamefailure),theburnercontrolwilllockoutandrequireamanualreset.
Thephotocurrentismeasuredwithadirectcurrentammeterinserieswiththephotounit(+poleonterminal12.Max.5kΩinternalresistanceinmeasuringinstrument).Withflame,photocur-rentmustbeatleast65µAat230V.
Withnoflame,themeasuredphotocurrentmustbemax.5µAat230V.
Measuring of current through photo unit
Terminal rating Terminal Max. operating current3 5A4 1A5 1A
6/7 1A8 5A
10 1A
Alarm/reset-function Ifafaultoccurs,theburnercontrolwilllockout,thisisshownbyaconstantredlightinthepressbutton.Thereasonforlockoutcanbereadbymeansofflashcodesinthepressbutton.Pressthebuttonandkeepitdownfor5seconds,thecontrolwillchangetoshowflashcodes,seeta-ble.Theflashcodeisshownatintervalsof2sec-onds,toreturnto“resetmode”presstheresetbuttonandkeepitdownfor5seconds.Thecontrolisresetbypressingtheresetbuttonshortly.
Note! It is only possible to reset the control in “reset mode”.
Whenreset,thecontrolwilltrytorestart,butifthefaultstillexistsoranewhasoccurred,thecontrolwilllockoutagain.Alltypes,exceptBHO71.10,havea230Va.c.alarmsignalonterminal10.OnBHO74.10theconnectionofremoteresetispossible(max.20mcable).
Intheeventofundervoltage,thecontrolwilltakeupawaitingpositionasdescribedinnextpara-graph.Thisisindicatedbyaflashcodeof8flash-esfromthepressbutton.Whenthevoltageiswithintheworkarea,theflashcodestopsandthecontrolstartsasnormal.
FlashcodesEvent CodeFalselight 2flashesNoflamewhensafetytimeelapses 3flashesMorethanthreerestartsinthesamecycle 4flashesMax.waitingtimeonpreheateroverrun(10min) 5flashesSupplyvoltageabove264Va.c. 6flashes
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.024
Technical data Ratedvoltage 230V~Operatingrange 195-253V~Frequency 50-60Hz±6%Consumption 10VAReset ImmediatelyReactiontimeonflamefailure Max.1sUndervoltageprotection <170
Protectionclass II
Pollutiondegree 2
Mainfuse Max.10A
Cableconnection Platefor5PG11screwedconnectionsorplatewithknockouts
Ambienttemperature -20to+60°CInstallation AnypositionEnclosure IP40Flamemonitoring LDorLDSMax.cablelengthbetweenBHOandLD/LDS 20m(installedseparately)
Base ThebaseoftheBHOhas12terminalsforthecableconnection.Inadditionitisfittedwith:• Threeextraneutralterminalsconnectedto
terminal2.• Fourinternallyconnectedearthterminalsfor
connectiondirecttotheburnerhousingviaaplate.
• Twoloopterminalsmarked31and32.• TwoØ54holesforfixingofbase.
Twodifferentfrontplatesareavailableforthebase,bothwithknockouts.Oneforcableentrywithcablerelief,theotherwithoutcablerelief.
Theupperpartandbasearekepttogetherbyaspringsystem.Theupperpartcanberemovedbypressingascrewdriverdownintotheslot,seedrawing.
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.02 5
BHO73.10 BHO74.10
BHO72.10/BHO72.11
Electrical connections
BHO71.10
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.026
Type Code no. Prepurget1* t3
Post-ignitiont3n
IntervalV1-V2
Safety timet2 max.
BHO71.10 057H6101 13 15 10BHO72.10 057H6102 13 15 15 10BHO72.11 057H6103 6 20 20 10BHO73.10 057H6104 13 2 15 10BHO74.10 057H6105 25 2 5 5
* Prepurgetimeandpre-ignitiontimeareidentical. Duetoinitializationoftheelectronicsitwill,however,lastupto2sec.beforetheignitioniscoupled.
Code numbers
Type Code no. Cable length L [mm] Remarks Colour
LD 057H7078 2000 5)Longhousing,normalsensitivity BlackLD 057H7079 780 5)Longhousing,normalsensitivity BlackLD 057H7081 500 5)Standardhousing,normalsensitivity Black
LDS 057H7085 500 5)Standardhousing,highsensitivity RedLDS 057H7087 520 5)Longhousing,highsensitivity RedLDS 057H7091 350 5)Extralonghousing,highsensitivity RedLDS 057H7092 800 5)Longhousing,highsensitivity RedLDS 057H7093 500 5)Standardhousing,extrahighsensitivity LightblueLDS 057H7094 600 5)Longhousing,extrahighsensitivity Lightblue
5)Seepage7.Dimensions
Photo units
Accessories
Code no. Type RemarksFlange 057H7070Flange 057H7071Clampingring 057H7072
Base 057H7010Frontplate1) 057H7011 Withthreadfor5PG11screwedconnections
Frontplate2) 057H7012 Side :1×∅8.8mm/∅17.5mmFront :3×∅7mm+oval6×20mm
Adapter 057H7020 BHA11/12 Forservicemarket2) Forservicemarket.
BurnercontroloutputsignalsRequiredinputsignals
A' InitializationofburnerwithoilpreheaterOFVA InitializationofburnerwithoutoilpreheaterB FlameformationC OperatingpositionD Burnerstoptw HeatingofoilpreheateruntilreadymessagethroughswitchOTRt1 Prepurget2 Safetylockouttimet3 Pre-ignitiont3n Post-ignitiont4 Intervalbetweenflameformationandreleaseofvalveterminal5(V2)
Time function/explanation
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.02 7
Dimensions
Controlwithbaseandfrontplate
Photo unit LD/LDS
Base057H7010.Hatchedpartisinterchangeable
Frontplate057H7011
Frontplate057H7012
Shorthousing H = 50mmLonghousing H = 65.5mmExtralonghousing H = 105mmCablelength L = seepage6
057H7070
057H7072057H7071
Technical Information Oil Burner Controls BHO 70 Series
520F0618 DKBD.PC.021.A3.028 ProducedbyDanfossIndustriService-Advertising06.06FO-bpv.E
burner.danfoss.com