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