LFE1... Burner Controls. Siemens Building Technologies HVAC Products. Series 03 Supplementary Data Sheet 7712

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1 7 461 ISO 9001 Burner Controls LFE1... Series 03 Supplementry Dt Sheet 7712 he LFE1... urner control is designed for use with forced drft gs nd dul-fuel urners of ny cpcity, in intermittent opertion. he LFE1... nd this Dt Sheet re intended for use y OEs which integrte the urner controls in their products. Use he LFE1... is designed for the fully utomtic control nd supervision of single-stge, multi-stge or modulting gs or dul-fuel urners. It is suited for use with expnding flme nd interrupted pilot type gs urners. Flme supervision is ensured y mens of n ioniztion proe or UV flme detector. Ignition sprk proving with UV flme detector is lso possile. When used in connection with gs vlve proving system LDU11... (refer to Dt Sheet 7696), the control sequence of the LFE1 cn e extended to include utomtic gs vlve proving. All types of LFE1... urner controls comply with the relevnt Europen stndrds for gs nd oil urners of ny cpcity. he LFE1... cn control the following urner plnt components: fn motor, flue gs fn, ir dmper, ignition trnsformer, 1 to 3 fuel vlves, lod controller nd n externl lockout wrning device HVAC roducts

2 Specil fetures - repurge time djustle etween 8 nd 63 seconds - Opertion with or without postpurging - Fully utomtic control of the ir dmper, irrespective of the ctutor running time - he ir pressure check cn e comined with the functionl check of the ir pressure monitor prior to strtup - Different types of ignition: direct ignition, with pilot urner, without or with ignition sprk proving - First nd second sfety time djustle etween 0 nd 9 seconds - Automtic test of the UV flme detector during urner off periods nd during the purging times - Optionl semi-utomtic strt nd opertion - Built-in lockout wrning lmp Wrning notes o void injury to persons, dmge to property or the environment, the following wrning notes should e oserved! Before performing ny wiring chnges in the connection re of the LFE1, completely isolte the urner control from the mins supply (ll-polr disconnection) Ensure protection ginst electric shock hzrd y providing dequte protection for the terminls Check wiring nd ll sfety functions ress the lockout reset utton only mnully, without using ny tools or pointed ojects Fll or shock cn dversely ffect the sfety functions. Such units my not e put into opertion, even if they do not exhiit ny dmge Seling screws my only e loosened nd fctory settings my only e chnged y uthorized stff ounting notes Ensure tht the relevnt ntionl sfety regultions re complied with Locte the ignition electrode nd ioniztion proe such tht the ignition sprk cnnot rc over to the ioniztion proe (risk of electric overlods) Lrge terminl comprtment 4 dditionl terminls for the erth conductor, 4 for the neutrl conductor, nd 4 uxiliry terminls Built-in unit fuse Instlltion notes Instlltion work must e crried out y qulified stff Oserve the permissile length of the detector cles (refer to «echnicl dt») Alwys run the ignition cles seprtely while oserving the gretest possile distnce to the unit nd to other cles 2/16

3 Electricl connection of ioniztion proe nd UV detector It is importnt to chieve prcticlly disturnce- nd loss-free signl trnsmission: Never run the detector cle together with other cles Line cpcitnce reduces the mgnitude of the flme signl Use seprte cle Insultion resistnce ust e minimum of 50 Ω etween ioniztion proe nd ground Soiled detector holders reduce the insultion resistnce, thus supporting creepge currents Erth the urner in complince with the relevnt regultions; erthing the oiler lone does not suffice Oserve the polrity Burner controls LFE1... re le to detect wrong polrity of live nd neutrl conductors, in which cse they initite lockout t the end of «SA» he ioniztion proe does not offer protection ginst electric shock hzrd Commissioning notes Commissioning nd mintennce work must e crried out y qulified stff he progrm indictor shows continuously the progrm sequence he motor of the sequence switch cn e switched off (to simplify urner djustments) he cmshft of the sequence switch cn e turned mnully Optionl electricl remote lockout reset For setting notes, refer to «Setting fcilities on the urner control» When commissioning the plnt for the first time or when doing mintennce work, mke the following sfety checks: Sfety check to e crried out: Anticipted response: ) Burner strtup with flme detector drkened Lockout t the end of «SA» ) Burner strtup with flme detector exposed Delyed lockout to extrneous light c) Burner opertion with simulted loss of Lockout flme; for tht purpose, drken the flme detector during opertion nd mintin tht sttus d) Burner strtup without ir pressure signl Lockout during the prepurge time e) Burner opertion with simulted ir pressure filure Immedite lockout Disposl notes he unit contins electricl nd electronic components nd my not e disposed of together with household grge. Locl nd currently vlid legisltion must e oserved. 3/16

4 echnicl design he LFE1... is of plug-in design nd cn e mounted in ny position, on the urner, on control pnel, or inside control cinet. he spcious terminl se nd the housing re mde of impct-proof nd flmeretrding plstic. he sequence switch, which is driven y synchronous motor, the uxiliry relys, the electronic flme signl mplifier nd ll other switching, control nd djusting elements re mounted on roust printed circuit ords nd included in the test circuit of the urner control. he urner control is secured to its se with 4 screws. he unit cover is protected ginst tmpering y mens of 2 seling screws (refer to «Dimensions»). A unit fuse protects the control contcts. ype summry nd ordering ype reference * LFE1.1 / 8854 LFE1 / 8851 LFE1 / 8853 LFE1 / 8866 LFE1 / 8867 LFE1 / 8868 LFE1 / 8892 ins voltge AC V AC V AC V Fctory settings for mins t1 SA t9 frequency 15 s 50 Hz 60 s 2 s 2 s 30 s 60 Hz 50 Hz 60 s 5 s 5 s he urner control is supplied without the terminl se. he se is to e ordered s seprte item using type reference AGG (FE) with g entry glnd, or AGG13.1 with metric entry glnd. * he full type reference of the urner control is given in the cler text field of the r code lel 4/16

5 echnicl dt Generl unit dt Environmentl conditions Stndrds ins frequency AC 220 V -15 %...AC 240 V +10 % AC 100 V -15 %...AC 110 V +10 % ins frequency Hz ±6 % Unit fuse (uilt-in) 6,3H250V to IEC 127 rimry fuse (externl) mx. 16 A (slow) ower consumption - Strtup - Opertion x. loding of control outputs - er terminl - otl 9 VA 6 VA mx. 4 A mx. 5 A Degree of protection I 40 ounting position optionl Cle entry glnds g11 Weight pprox. 2 kg rnsport IEC Climtic conditions clss 2K2 echnicl conditions clss 22 emperture rnge C Humidity < 95 % r.h. Opertion IEC Climtic conditions clss 3K5 echnicl conditions clss 32 emperture rnge C Humidity < 95 % r.h. Condenstion, formtion of ice nd ingress of wter re not permitted! CE conformity According to the directives of the Europen Union Electromgnetic comptiility EC 89 / 336 EEC incl. 92 / 31 EEC Directive for gs pplinces 90 / 396 EEC Low voltge directive 73 / 23 EEC Identifiction code to EN 298 F B L L B N Flme supervision Flme detector Ioniztion proe Flme detector Required detector current - At AC 100 V nd AC 220 V in. 8 µa in. 150 µa - At AC 110 V nd AC 240 V in. 9 µa in. 200 µa Detector current x. 100 µa x. 650 µa erm. cle length 20 m ¹) 20 m ¹) erm. mient temperture C ype of insultion --- Doule insultion 1) If longer distnces need to e covered, use low cpcitnce cle (e.g. single-core cle, totlly mx. 2 nf) 5/16

6 Function rerequisites for urner strtup he urner cn e strted only when - the urner control s sequence switch is in its strt position - the urner control hs not locked out, e.g. cused y defective UV tue - the contcts of ll control nd sfety devices in the control loop etween terminls 8 nd 9 re closed - the ir pressure monitor does not indicte ir pressure Defects in the flme supervision circuit or in the urner control itself prevent strtup or led to lockout during the strtup sequence. If the ir dmper is not controlled y the urner control, terminls 20, 21 nd 22 must e interconnected. rogrm sequence on strtup First, the fn motor is ctivted vi terminl 3, nd the ctutor is controlled vi terminl 22. As soon s the ir dmper reches its fully open position, the urner control s sequence switch strts running nd the prepurge time commences. he minimum ir pressure set on the ir pressure monitor must e reched within 10 seconds (5 seconds with the LFE1.1) (or 7 seconds [3.5 seconds with the LFE1.1] with postpurging) nd must e mintined until controlled shutdown occurs. Otherwise, the urner control will initite lockout. A flme signl during the prepurge time lso leds to lockout. On completion of the set prepurge time, the ir dmper receives the control commnd to return to the fully closed position. he sequence switch remins sttionry during the time the ir dmper trvels to its closed position. As soon s the signl contct for minimum ir is operted y the ctutor, the sequence switch strts running gin nd continues with the urner s progrm sequence, which cn no longer e influenced from externlly: - reignition (3 seconds / 1.5 seconds with the LFE1.1) - Relese of the first fuel vlue t terminl 5 (the fuel vlve of pilot urner, which must e shut on completion of the second sfety time, must e connected to terminl 10) - Completion of the set sfety time. If no flme is estlished during tht period of time, lockout will occur (lwys with interlocking of the urner control) - Following n intervl of 11 seconds (5.5 seconds with the LFE1.1) of the first fuel vlve, the second fuel vlve will e relesed - he pilot urner, if connected to terminl 10, will e shut - he lod controller will e switched on following further intervl of 12 seconds (6 seconds with the LFE1.1). he urner s operting position hs thus een reched. From now on, the lod controller controls the urner s output y incresing or decresing the fuel throughput nd the ir flow in response to the het demnd (ir / fuel rtio control). his cn e ccomplished either in stepwise fshion, e.g. with thermostt, or continuously y mens of modulting controller Loss of flme during opertion lwys leds to lockout. Strtup with ignition sprk proving In principle, the progrm sequence is the sme s tht without ignition sprk proving. Exceptions: - If the UV flme detector does not receive n input signl during the preignition time, lockout will occur efore ny gs is relesed, tht is, sfety time SA = 0 seconds - With ignition sprk proving, the sfety time for the pilot urner cn only e djusted etween seconds (= SA in the sequence digrm of the sequence switch) 6/16

7 Control sequence following controlled shutdown Control sequence following lockout reset Controlled shutdown tkes plce s soon s one of the control or monitoring devices in the control loop etween terminls 8 nd 9 opens its contcts. As result, the fuel vlves re immeditely shut nd the sequence switch is restrted to progrm postpurging, if scheduled. On completion of the postpurge time, the sequence switch hs reched its strt position gin, which is mintined until the next switch-on commnd is given. During the postpurge time, flme supervision is strted gin. Hence, ny flme signl tht occurs during tht period of time will led to lockout. After pressing the uilt-in or remote lockout reset utton, the sequence switch will return to its strt position. In tht cse, the only urner plnt component tht is switched on is the fn motor connected to terminl 17. Since in norml circumstnces the control thermostt or pressurestt continues to cll for het, the urner control immeditely triggers new strt when the strt position is reched. rogrm indictor he progrm indictor continuously indictes the progress of the strtup sequence. he letters on the indictor disk correspond to those in the djcent sequence switch digrm. he numers give the remining prepurge time. In the event of lockout, oth sequence switch nd progrm indictor stop, showing the phse of opertion during which lockout occurred. Reding the progrm indictor repurge time lsts nother 35 seconds Vlve 2 t terminl 7 opens F E D 7/16

8 Bsic digrm (R) SB EK2* 1 16 AS r1 EK1* VIII r1 IX 8 18 L G R fr1 W r3 XIII (11) ~ z N 1 LK 4 ~ N 20 VIII fr2 IX NC FR XI 15 QRA... FE X XI II IV VII I XII IV AR III V VI r2 L1 r2 UL1 BR S /1001 N (p) Z GV1 (GV) GV2 GV3 2 ~ L2 When using flme detector QRA..., terminl 13 must e erthed. Legend AR Lod rely with contcts «r...» LF UV flme detector QRA... AS Unit fuse L Air pressure monitor BR Lockout rely with contcts «r...» L1 Lockout wrning lmp (uilt-in) BS... Selector L2 Lockout wrning lmp (externl) c Fn contctor with contcts «c...»... Fn d Auxiliry rely with contcts «d...» NC Dely element (negtive temperture coefficient) e herml overlod contct OV... Oil vlve EK1 Lockout reset utton on the urner control QRA... UV flme detector EK2 Remote lockout reset utton R, R1 Control thermostt or pressurestt FE Ioniztion proe R2 Lod controller FR Flme rely with contcts «fr...» RV Control vlve FW Flme supervision SB Sfety limiter G Gs pressure monitor S Synchronous motor of the sequence switch GV... Gs vlve SQ... Air dmper ctutor (type reference) (GV) Gs vlve for pilot urner tht is switched off fter UL1 Operting switch of the sequence switch motor the second sfety time (cn only e ccessed when housing cover is removed) H in switch W emperture or pressure limiter LK Actutor with end or uxiliry switches Z Ignition trnsformer = ctutor trvels to the fully open position (mximum mount of ir) * Do not press lockout reset utton «EK...» for more thn 10 seconds! z = ctutor trvels to the fully closed position (min. mount of ir) 8/16

9 Sequence digrm of sequence switch I II III IV V VI SA t4 t3 t5 SA t9 VII VIII IX X XI XII XIII t7 t11 t10 t1 t8 t12 t /0901 Switching times (Fctory settings: refer to «ype summry nd ordering») LFE1... LFE s 60 s Running time of sequence switch t s s repurge time (djustle) SA s s First sfety time (djustle, setting 0 s for ignition sprk proving) SA s s Sfety time for the pilot urner on strtup with ignition sprk proving t3 3 s 1.5 s reignition time (sfety time for ignition sprk proving) t4 11 s 5.5 s Intervl etween relese of the first nd second fuel vlve t5 12 s 6 s Intervl etween relese of the second nd third fuel vlve or lod controller t6 (30 + t1) (15 + t1) ostpurge time t7 3 s 1.5 s Dely time t8 t t11 + t12 t t11 + t12 Durtion of strtup sequence t s 4.5 s Second sfety time with interrupted pilot urners t10 10 s 5 s reset time for ir pressure check t11 optionl optionl Opening time of ctutor «SA» t12 optionl optionl Closing time of ctutor «SA» ximum permissile fterurn time (from the eginning of «t6») 7 s 3.5 s 9/16

10 Setting fcilities on the urner control Generl notes - rior to mking ny settings, disconnect the urner control from the mins supply - Loosen ll 6 retining screws nd remove the unit cover - he switching cm numering strts from the motor - he cmshft cn e mnully turned to ny position (direction of rottion clockwise when viewed from the sequence switch motor) Setting elements 7761p03/0201 UL1 ON / OFF switch of the sequence switch motor N1 Cm 1, fixed N2, N3 Cms 2 nd 3, djustle (first sfety time) N4 Cm 4, fixed N5 Cm 5, djustle (second sfety time) N7 Cm 7, fixed N8 Cm 8, djustle (prepurge time) A rogrm indictor disk UL1 N1 N2N3 N4 N5 N7 N8 A Setting the prepurge time - Loosen the securing screw of the red cm N8 - urn cmshft mnully until the required prepurge time ppers next to the index mrk (stmped on the sequence switch rcket) - Hold cmshft firmly nd rotte cm N8 until the contct stud ctuted y it jumps out or until the cm runs ginst the stud - ighten the cm securing screw crefully nd then check the djusted time for ccurcy. he time is lso visile through the viewing window when the urner control is in its strt position Adjustment of the setting mrk of the red cm N8 to the time mrks on the lck cm N7 produce the prepurge times shown elow. Ι ΙΙ ΙΙΙ N7 N8 7761p04/0698 Cm N8 djusted to... LFE1... LFE cm N7 mrk I t1 = 8 s 4 s II 18 s 9 s III 28 s 14 s Setting t the stop 63 s 31,5 s Fctory setting pprox. 30 s or 60 s pprox. 15s or 30 s 10/16

11 Setting the sfety times First sfety time SA he settings re mde y mens of the red cms of the sequence switch. heir time mrks serve s djustment guides. On completion of the settings, the securing screws of the cms should e tightened crefully to prevent indvertent redjustments. (Opertion without ignition sprk proving) - Loosen the securing screws of cms N2 nd N3 - Hold cm N1 nd rotte cm N2 so tht its setting mrk ligns with the relevnt time mrk of cm N1 (see illustrtion nd tle; intermedite settings re possile). Secure cm N2 - Rotte cm N3 so tht its setting mrk is ginst the lower stop of cm N2. Secure cm N3 - Check the djusted sfety time. he new sfety time is to e indicted on the plte (setting slot ccessile from the ottom of the unit cover) 7761p07/1296 Cm N2 djusted to... LFE1... LFE cm N1 time mrk I SA = 0 s 0 s II 4.5 s 2.3 s III 9 s 4.5 s Fctory setting Depending on vrint < 2 s III II I N1 N2 N3 First sfety time SA (Opertion with ignition sprk proving) - Loosen the securing screws of N2 nd N3 - Hold cm N1 firmly, set the setting mrk of cm N2 to the time mrk I of cm N1 nd secure cm N2 - Hold cm N2 firmly, set the setting mrk of cm N3 to the desired time nd secure cm N3 (see illustrtion nd tle) - Check the djusted sfety time Cm N3 djusted to the stop in the direction of the rrow... the stop in the other direction LFE1... SA = 0 s LFE s 6 s 3 s Fctory setting Depending on vrint < 2 s Second sfety time t9 - Loosen the securing screw of cm N5 nd set its setting mrk to the relevnt time mrk of cm N4 (see illustrtion nd tle; intermedite settings cn e mde) 7761p08/1296 Cm N5 djusted to... LFE1... LFE cm N4, ime mrk I t9 = 0 s 0 s II 4.5 s 2.3 s III 9 s 4.5 s Fctory setting Depending on vrint < 2 s III II I N4 N5 11/16

12 Connection exmples nd sequence digrms Connection exmples for expnding flme urners Actutor control y the LFE1... No output control. When using UV flme detector QRA..., terminl 13 must e connected to erth. LFE e1 (R) SB H 2 c2 e2 FE + LF N (p) EK2 L L2 e z R1 W N LK G e2 c2 Z GV1 GV3 GV /1196 A B C D E Luft Gs GV3 LK / 18// 20 LK "" GV /1196 GV1 LK "z" /0301 t11 t1 t12 t11 tn t6 t12 Air dmper control (detiled) In the cse of urners with no ir dmper or with n ir dmper not controlled y the urner control, terminls 20, 21 nd 22 must e interconnected nd circuit pth ecomes osolete. A t8 B tn C t6 D E F G H I t6 K L 1 Kl. 3 t7 t t11 t1 t12 t1 LK 22/21 SA SA Z 6 t3 t3 GV1 5 t4 t4 GV2 7 t5 t5 GV /14 FW 13/15 L / /16

13 Connection exmples for interrupted pilot urners On / off control with checked ir dmper opertion. When using UV flme detector QRA..., terminl 13 must e connected to erth. LFE e1 (R) SB H 2 c2 e2 L2 N (p) e2 FE c2 + LF EK2 /c2 L e1 R1 W G BS R2 I IV III II z % 0% 33% 38% 31% 46% LK N (SQ...) GV3 GV2 (GV) Z /1196 Selector BS I Nominl lod II Stop III rt lod IV Automtic control 21//BS/R2 21/ 22/ A B C DE GV3 Gs Luft GV2 LK 18/ 20 "" Gs (GV) /1196 "kl. Fl." "z" t11 t1 t12 t /1196 Air dmper control (detiled) A t8 B tn C t6 D E F G H I t6 K L 1 2 Kl t11 t7 t1 t12 LK 22/21 SA Z 6 t3 (GV) 10 t4 GV2 GV t5 t9 FW 13/14 13/15 L2 12 t7 t1 SA t3 t4 t5 t /0301 Legend to the sequence digrm A Strt G-H Opertion A-B Norml strt H Loss of flme B-C Opertion H-I Fult C Controlled shutdown I Reset C-D ostpurging I-K rveling to the strt position D-E Air dmper closing K New strt E-F Off period K-L Strtup sequence F New strt L 4 Opertion F-G rveling to the strt position 13/16

14 LFE... for firing on gs or oil UV flme detectors cn supervise oth oil nd gs flmes, ut gs flmes cn lso e supervised with ioniztion proes. (17) LFE e1 SB H 2 c2 e2 e1/e2 /c2 L /c2 BS2 I II III R1 W BS1 I II III IV z 3 6 R OV3 OV1 OV2 BS2 I II III (R) L2 N (p) + LF EK2 100% 0% G LK N % 38% 31% 46% (SQ...) GV3 Z GV1 GV /0901 When using UV flme detector QRA..., terminl 13 must e connected to erth. Öl Luft Gs OV2 OV1 LK GV1 GV2 OV3 Selector BS1 I Nominl lod II Stop III rt lod IV Automtic control Selector BS2 I Gs II Off /1196 III Oil GV3 14/16

15 Connection exmples for modulting urner control including checked ir dmper opertion odulting urners designed for the continuous djustment of the urner s output require temperture or pressure control system, in ddition to the stndrd urner control equipment, for exmple: odulting controller emperture or pressure sensor with integrted setpoint djuster Actutor for control of the ir dmper nd the fuel throughput (ir / fuel rtio control) Auxiliry rely Selector Control vlve or similr for djustment of the mount of fuel RWF40... Q... SQ... BS RV LFE e1 (R) SB H 2 c2 e2 FE + LF N (p) EK2 /c2 L L2 R W G e1 I BS II III LK IV z RV N SQ... Q... RWF40... e2 c2 GV1 Z /0901 When using UV flme detector QRA..., terminl 13 must e connected to erth. Luft Gs GV1 LK SQ /1196 RV Selector BS I Nominl lod II Stop III rt lod IV Automtic control Air pressure monitor «L» ~ e (17) mx. 5A c L R W 0,1A N (p) /1196 he ir pressure is constntly monitored from urner strt to controlled shutdown. If the set minimum ir pressure is not reched 10 seconds * fter the strt of prepurging (7 seconds ** with the progrm with pre- nd postpurging), or the ir pressure is lost gin ny time therefter, the urner control will initite lockout. If the ir pressure monitor «L» is connected s shown in the djcent digrm, the pressure monitor is lso utomticlly tested for correct functioning prior to ech strt. If the contct s position is not correct, strtup will e prevented. * (5 seconds with the LFE1.1...) ** (3.5 seconds with the LFE1.1...) esuring circuit for ioniztion current FE /1196 LFE1 Legend FE Ioniztion proe icrommeter Ignition cn hve n impct on the ioniztion current. (Remedy: interchnge the ignition trnsformer s primry connections) 15/16

16 Dimensions Dimensions in mm LFE1... g entry glnd AGG (FE) etric entry glnd AGG 13.1 G11;3/4"-16DNF 1 17 A 210 B A SG EK 13,514, A B A 7461m01e/1101 4,5 17,2 g entry glnd AGG (FE) etric entry glnd AGG , ,7 46,7 C C C 4,5 18,9 17, , , , ,7 o remove the urner control from its plug-in se, loosen the 4 screws A. o remove the unit cover, loosen the 2 screws B lso. C: elongted holes for securing the se EK: lockout reset utton SG: viewing window 16/ AG Suject to chnge

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