7 161 Oil Burner Controls LAE1... Oil urner controls for use with urners of ny cpcity in intermittent opertion. For sfety resons, t lest one controlled shutdown must tke plce every 24 hours. he LAE1... nd this Dt Sheet re intended for use y OEs which integrte the urner controls in their products. Use he LAE1... with the ssocited silicon photocell detector RAR9... is used for the fully utomtic strtup nd supervision of - single-stge forced drft urners - multistge forced drft urners - modulting forced drft urners - with ny oil throughput he design, control sequence nd setting choices offered y the LAE1... enle this urner control to e used in lmost ny type nd size of oil-fired comustion plnt. Β ote! Do not use for new designs.
Use (cont d) Specific fetures - Prepurge time djustle etween 8 nd 63 seconds - Opertion with or without postpurge (optionl) - Fully utomtic control of ir dmper, if required (with ny ctutor running time) - Possiility of ir check, in connection with functionl check of the ir pressure switch prior to strtup - Ignition optionl (directly ignition or with pilot urner) - Preignition time djustle («long» - during prepurge, «short» - 3 seconds) - Sfety time djustle etween 0 nd 9 seconds - Opertion optionl, without or with one-time strt repetition in the event of loss of flme during opertion - Automtic extrneous light test during urner off periods nd during the pre- nd postpurge time - Integrted lockout wrning lmp - Electric remote lockout reset - Cover with 2 dditionl seling screws to ensure protection ginst tmpering (refer to «Dimensions») Wrning notes o void injury persons, dmge to property or the environment, the following wrning notes must e oserved! he unit my only e opened, interfered with or modified y qulified stff! All ctivities (mounting, instlltion nd service work, etc.) must e performed y qulified stff Before mking ny wiring chnges in the connection re, completely isolte the plnt from mins supply (ll-polr disconnection). Ensure tht the plnt cnnot e indvertently switched on gin nd tht it is indeed ded. If not oserved, there is risk of electric shock hzrd Ensure protection ginst electric shock hzrd y providing dequte protection for the urner control s connection terminls Ech time work hs een crried out (mounting, instlltion, service work, etc.), check to ensure tht wiring is in n orderly stte nd mke the sfety checks s descried in «Commissioning notes» Only press the lockout reset utton / opertion utton mnully (pplying force of no more thn 10 ) without using ny tools or pointed ojects. If this is not oserved, there is risk of loss of sfety functions nd risk of electric shock Fll or shock cn dversely ffect the sfety functions. Such unit must not e put into opertion, even if they do not exhiit ny dmge Do not press the lockout reset utton on the unit or the remote lockout reset utton for more thn 10 seconds since this would dmge the lockout rely in the unit ounting notes Ensure tht the relevnt ntionl sfety regultions re complied with ount nd djust the flme detector such tht it cn detect the supervised flme Instlltion notes Live nd neutrl conductors must not e mixed up For the connection of vlves nd other plnt components, use the plnt digrm nd the mounting nd commissioning instructions provided y the urner mnufcturer In the event of loss of flme during opertion, the urner control will initite lockout. If strt repetition is required, chngeover ltch «UL3» must e set to «Repetition» 2/17
Electricl connection of flme detectors Commissioning notes Stndrds nd certifictes It is importnt to chieve prcticlly disturnce- nd loss-free signl trnsmission: ever run the detector cle together with other cles Line cpcitnce reduces the mgnitude of the flme signl Use seprte cle Oserve the mximum permissile detector cle lengths (refer to «echnicl dt») When commissioning the plnt or when doing mintennce work, mke the following sfety checks: Sfety check to e crried out Anticipted response ) Burner strt with flme detector drkened Lockout t the end of «SA» ) Burner strt with flme detector exposed to extrneous light c) Burner opertion with simulted loss of flme; for tht purpose, drken the flme detector in opertion nd mintin tht stte Lockout fter no more thn 40 seconds - With repetition: Restrt followed y lockout t the end of «SA» - Without repetition: Immedite lockout Applied directives: Low-voltge directive 2006/95/EC Directive for pressure devices 97/23/EC Electromgnetic comptiility EC (immunity)*) 2004/108/EC *) he complince with EC emission requirements must e checked fter the urner control is instlled in equipment Complince with the regultions of the pplied directives is verified y the dherence to the following stndrds / regultions: Automtic urner control systems for oil urners DI E 230:2005 Automtic electricl controls for household nd similr use Prt 2-5: Prticulr requirements for utomtic electricl urner control systems DI E 60730-2-5:2005 he relevnt vlid edition of the stndrds cn e found in the declrtion of conformity! EAC Conformity mrk (Eursin Conformity mrk) ISO 9001:2015 ISO 14001:2015 OHSAS 18001:2007 3/17
Life cycle Burner controls hs designed lifetime* of 250,000 urner strtup cycles which, under norml operting conditions in heting mode, correspond to pprox. 10 yers of usge (strting from the production dte given on the type field). his is sed on the endurnce tests specified in the stndrd E 230. A summry of the conditions hs een pulished y the Europen Control nufcturers Assocition (Afecor) (www.fecor.org). he designed lifetime is sed on use of the urner controls ccording to the mnufcturer s Dt Sheet. After reching the designed lifetime in terms of the numer of urner strtup cycles, or the respective time of usge, the urner control is to e replced y uthorized personnel. * he designed lifetime is not the wrrnty time specified in the erms of Delivery Disposl notes he unit contins electricl nd electronic components nd must not e disposed of together with household grge. Locl nd currently vlid legisltion must e oserved. echnicl design LAE1... Housing - Plug-in design - he uilt-in unit fuse protects the control contcts ginst overlods - Ale for optionl mounting position t urner, on control pnes or in control cinets - Control unit driven y synchronous motor, the uxiliry relys, the electronic flme signl mplifier s soon s ll the rest of switch, control nd djustle elements re uild-on t stle PCBs nd included in test circuit of 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») - Lrge connection re - de of lck, impct-proof nd het-resistnt plstic - Lockout reset utton with viewing window, locted ehind it re the lockout wrning lmp the lockout indictor - coupled to the progrm shft - visile in the trnsprent lockout reset utton - uses esy-to-rememer symols to indicte the type of fult nd the point in time lockout occurred - 4 extr terminls for the erth conductor, 4 extr terminls for the neutrl conductor, nd 4 uxiliry terminls - to e keep y 4 screws of plug-in se 4/17
ype summry Accessories (must e ordered seprtely) Article no. ype * ins voltge Fctory settings Hz t1 SA t9 BPZ:LAE1/1355 LAE1/1355 AC 220...240 V 50 30 s 5 s 5 s BPZ:LAE1/8846 LAE1/8846 AC 220...240 V 50 30 s 2 s 2 s BPZ:LAE1/8864 LAE1/8864 AC 100...110 V 60 30 s 2 s 2 s BPZ:LAE1/8865 LAE1/8865 AC 220...240 V 60 30 s 2 s 2 s * he type reference is given ner the terminls inside the housing Flme detector Silicon photocell detector RAR9... Refer to Dt Sheet 7713 Connection ccessories Plug-in se AGG41041713 (AE) with Pg11 thred for cle entry glnds Article no.: BPZ:AGG41041713(AE) 5/17
echnicl dt Generl unit dt Environmentl conditions ins voltge AC 220 V 15 %...AC 240 V +10 % AC 100 V 15 %...AC 110 V +10 % ins frequency 50 / 60 Hz ±6% Unit fuse (integrted) 6.3H250V to DI E 60127 Primry fuse (externlly) x. 10 A (slow) Weight Approx. 1.85 kg Power consumption - On strtup Approx. 9 VA - In opertion Approx. 6 VA ounting position Optionl Degree of protection IP40, when uilt in, with the exception of the connection re (terminl se) Sfety clss II Cle glnds Pg11 or BSP ¾ Perm. lod on control outputs - Per terminl - otl (input current terminl 1) x. 4 A to VDE 0660 AC3 x. 5 A to VDE 0660 AC3 Storge DI E 60721-3-1 Climtic conditions Clss 1K3 echnicl conditions Clss 12 emperture rnge -20...+60 C Humidity <95 % r.h. rnsport DI E 60721-3-2 Climtic conditions Clss 2K2 echnicl conditions Clss 22 emperture rnge -20...+60 C Humidity <95 % r.h. Opertion DI E 60721-3-3 Climtic conditions Clss 3K5 echnicl conditions Clss 32 emperture rnge -20...+60 C Humidity <95 % r.h. Instlltion ltitude x. 2,000 m ove se level Wrning! Condenstion, formtion of ice nd ingress of wter re not permitted! If this is not oserved, there is risk of loss of sfety functions nd risk of electric shock. Flme detectors RAR9 Refer to Dt Sheet 7713! esurement circuit for LAE1... Perm. length of connecting cle 20 m (in the cse of longer distnces, use lowcpcitnce cle, e.g. single-core, nd RAR9...) Required detector current in. 8 µa Possile detector current x. 25 µa - - + 14 13 LAE1... Legend RAR9... Silicon photocell detector icrommeter RAR9... + 7161v01/0908 6/17
Function Preconditions for urner strtup he urner will e strted only if - the sequence switch of the LAE1... is in its strt position - the LAE1... hs not triggered lockout - the contcts of ll control nd monitoring devices in the control loop etween terminls 8 nd 9 re closed - the ir pressure switch if included in the test circuit does not signl ir pressure Fults in the flme supervision section of the LAE1... prevent strtup or, in the cse of strtup, led to lockout. Β ote! If the ir dmper is not controlled y the LAE1..., terminls 20, 21 nd 22 must e interconnected. he LAE1... cn control the following urner plnt components: - Fn motor - Flue gs fn - Air dmper - Ignition trnsformer - 1 to 3 fuel vlves - 1 externl fult indiction unit A lod controller with 3-position output cn e connected. Strtup sequence Specific fetures - Continuous indiction of the progrm sequence in the viewing window of the unit cover - In the event of fult, the progrm indictor shows the progrm phse during which lockout occurred - he motor of the sequence switch cn e switched off to fcilitte the urner setting procedure - he cm shft cn e rotted mnully... on strtup First, the fn motor is switched on vi terminl 3 nd the ctutor is controlled vi terminl 22. When the ir dmper reches its mximum position, the sequence switch of the LAE1... strts to operte nd the prepurge time commences. he minimum ir pressure set on the ir pressure switch must then e reched within 10 seconds (or within 7 seconds in the cse of opertion with postpurge) nd 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 djusted prepurge time, the ir dmper is given the control commnd to return to the minimum position. During the time the dmper is closed, the sequence switch does not operte. As soon s the signl contct for the minimum throttling setting is ctuted y the ctutor, the sequence switch strts gin nd controls the progrm sequence which cn no longer e influenced from outside: - Preignition (if the ignition equipment ws not lredy switched on during the prepurge time) - Relese of the first oil vlve connected to terminl 5 (the fuel vlve of pilot urner which, on completion of the second sfety time must e switched off, is to e connected to terminl 10, however) - Completion of the djusted sfety time. If, during this period of time, no flme is estlished, the urner control will initite lockout with interlocking - 11 seconds fter relese of the first oil vlve, the second oil vlve will e relesed - he pilot urner if present nd connected to terminl 10 will e shut down - he lod controller will e switched on fter nother intervl of 12 seconds, which mens tht the urner s operting position is now reched. From now on, the lod controller controls urner output y incresing or decresing the oil throughput nd the mount of ir, depending on the demnd for het 7/17
Function (cont d) If the flme is lost during opertion, the urner control will initite lockout or if operting mode «with strt repetition» is used mke new strt. In tht cse, the sequence switch must return to its strt position, however, nd postpurging will tke plce if progrmmed. Control sequence... fter controlled shutdown Controlled shutdown occurs s soon s control or monitoring device in the control loop etween terminls 8 nd 9 opens its contct. he fuel vlves re immeditely shut nd postpurging, if included, will strt. he sequence switch will return to its strt position where it stys until the next switch on commnd is given.... fter lockout of the LAE1... After pressing the integrted or externl lockout reset utton, the sequence switch will return to its strt position, provided the fult hs een corrected. he only component of the urner plnt tht is switched on here is the fn motor connected to terminl 17. Since in norml circumstnces, the control thermostt or pressurestt continues to cll for het, the sequence switch initites new strt fter it hs reched its strt position. 8/17
Progrm sequence indictor LADIS & GYR ype Serie ts s V~ c/s Hz VA 4A V~ 2A 3 5 6 7 10 11 17 20 21 22 t1 = 8...63 s A B C E F G 30 40 1 2 (1) 3 7161p02/0102 he progrm sequence indictor shows the respective strtup position. he letters correspond to those given in the sequence switch digrm eside the viewing window. he numers give the remining prepurge time. In the event of lockout, the sequence switch nd the progrm sequence indictor stop, thus indicting the operting phse during which lockout occurred. Reding the progrm sequence indictor F E 30 40 7161p04/0102 7161p03/0102 Vlve 2 connected to terminl 7 will e opened Prepurge time lsts nother 35 seconds Chnging the control sequence wo chngeover ltches on the underside of the urner control cn e used to mke the following settings: UL2 Long preignition time During prepurging Fctory setting Short preignition time 3 seconds --- UL3 With repetition In the event of loss of flme during opertion Without repetition In the event of loss of flme during opertion Β ote! he fctory setting cn only e chnged fter loosening the screw. Retighten screw properly! --- Fctory setting 9/17
Settings nd djustments on the urner control Loosen ll 6 screws nd remove the cover of the LAE1... Alwys strt counting the switching cms from the motor side You cn mnully turn the cm shft to ny position you wnt (clockwise rottion s seen from the motor) 7161p05/0102 Setting elements 1 Cm 1, fixed 2 Cm 2, djustle (sfety time) 3 Cm 3, djustle (sfety time) 7 Cm 7, fixed 8 Cm 8, djustle (prepurge time) PA Sequence position indictor UL1 Operting switch O / OFF for sequence switch motor UL1 1 2 7 8 PA On the underside of the se: UL2 Chngeover ltch «short / long» preignition time UL3 Chngeover ltch «with / without» repetition Adjusting the prepurge time «t1» - Loosen the fixing screw of the red cm «8» - urn cm shft mnully until the required prepurge time is indicted next to the index notch on the sequence switch crrier - Hold the cm shft firm nd turn cm «8» until the tppet operted y it trips, or until the cm stops t this tppet - ighten the cm s fixing screw crefully nd then check the djusted time. he djusted time is lso visile through the viewing window when the LAE1... is in its strt position Adjustment of the mrk of the red cm «8» to the grdution mrks of the lck cm «7» results in the prepurge times given in the djcent tle. Adjusting the sfety time «SA» - Loosen the stop screws of cms «2» nd «3» - Hold cm 1 firm nd lign the grdution mrk of cm «2» to the corresponding time mrking of cm 1 (intermedite positions possile) (see djcent illustrtion nd tle). Lock cm «2» - Set djustment mrk of cm «3» to the lowest stop of cm «2» nd lock cm «3» - Check the djusted sfety time nd djust the new vlue on the rting plte of the cover (djustment slot on the underside of the cover) Η ΗΗ ΗΗΗ 7 8 Adjustment to t1 Grdution mrk I 8 s Grdution mrk II 18 s Grdution mrk III 28 s At stop 63 s Fctory setting pprox. 30 s III II I 1 2 Adjustment to SA Grdution mrk I 0 s Grdution mrk II 4.5 s Grdution mrk III 9 s Fctory setting 5 s 7161p06/0102 7161p07/0102 10/17
Connection digrm Unit fuse 6.3 A (slow) in the current pth etween terminl 1 nd rely contct «r...» is not shown. SB EK2 EK1 VIII VIII LP P W R LK z C FR 1 UL3 I II IV VII I IV UL2 AR III V VI UL1 BR S 716101/1010 OV1 (OV) OV2 OV3 2 Legend AR Lod rely with contcts «r...» LP Air pressure switch BR Lockout rely with contcts «r...»... Fn, ventiltor EK1 Lockout reset utton on the LAE1... C High temperture conductor (dely device) (do not press «EK1» for more thn 10 seconds!) OV... Oil vlve EK2 Remote lockout reset utton (OV) Fuel vlve for pilot urner, will e switched off on (do not press «EK2» for more thn 10 seconds!) completion of the 2 nd sfety time FR Flme rely with contcts «fr...» R Control thermostt or pressurestt L1 Fult indiction lmp (integrted) SB Sfety limit thermostt L2 Fult indiction lmp (externl) S Synchronous motor of sequence switch LF Light detector (silicon photocell detector RAR9...) UL1 Operting switch for sequence switch motor LK Actutor with end or uxiliry switches (only ccessile when cover is removed) = ctutor trvels to the «fully open» position UL2 Chngeover ltch «Long / short preignition time» (mx. ir volume) UL3 Chngeover ltch «With / without repetition» z = ctutor trvels to the «fully closed» position W Limit thermostt or pressure switch (min. ir volume) Z Ignition trnsformer 11/17
ime digrm of sequence switch he mximum permissile fterurn time is 7 seconds from the strt of «t6». Customer-specific presettings of the times on request! I II 81 79 SA III 89 IV V VI VII VIII IX 3 t7 t3 67 70 t4 t9 86 t3 t5 93 X XI XII XIII t10 t11 t1 7161d01/1098 t8 63 66 t12 t6 Legend 120 s Cycle time of the sequence switch SA 0...9 s Adjustle first sfety time t1 8...63 s Adjustle prepurge time t3 t1 + t11 + t12 + 7 s «Long» preignition time t3 3 s «Short» preignition time t4 11 s Intervl etween relese of 1 st nd 2 nd fuel vlve t5 12 s Intervl etween relese of 2 nd nd 3 rd fuel vlve or lod controller t6 (30 + t1) Postpurge time t7 3 s Dely time t8 t1 + 30 + t11 + t12 otl strtup time t9 5 s Second sfety time (only when ignition with pilot urner) t10 10 s Bridging time (predefined time for ir control) t11 optionl Opening time for the ir dmper t12 optionl Closing time for the ir dmper 12/17
Connection exmples Connection digrm nd sequence progrm for opertion with long preignition nd repetition (ctutor control checked, no lod control). * When using n ir pressure switch «LP», the connections etween terminls 3 nd 4 nd 8 nd 18 re not required Repetition SB H UL.3 LAE1 UL.2 Repetition 1 2 13 14 15 16 12 19 18 8 943 22 21 20 17 6 5 7 11 * * e2 d1 d1 1 2 e1 d1 c2 OV2 L e1 c2 e2 LF + EK2 L2 P LP 716102/1098 R W 1 2 12 11 z LK Z OV1 OV3 OV2 OV1 Air dmper control (in detil) In the cse of urners without or with ir dmper not controlled y the LAE1..., terminls 20, 21 nd 22 must e interconnected. In tht cse, current pth 18--21 must not e present! 22 21 21/d1 18//d1 20 LK"" A B C D E LK"z" 7161d03/1095 t11 t1 t12 t11 tn t6 t12 A t8 1 Kl.3 t7 2 17 t11 t1 t12 LK 22/21 SA Z 6 t3 OV1 5 t4 OV2 7 OV3 11 B t5 tn C t6 D E F t8 G H t6 I t7 t1 t3 K L SA FW 13/14 L2 Legend 12 7161d02/1098 A Strt G-H Opertion A-B orml strtup H Loss of flme B-C Opertion H-I Return to strt position C Controlled shutdown I Repetition C-D Postpurging I-K Strtup without estlishment of flme D-E Closing the ir dmper K-L Fult E-F Burner off period L Reset F Restrt L- Return to strt position F-G Strtup Restrt 13/17
Connection exmples (cont d) Connection digrm nd sequence progrm for opertion with short preignition nd without repetition. Ignition of min urner with light oil pilot urner (on / off control with checked ctutor control). * When using n ir pressure switch LP, the connections etween terminls 3 nd 4 nd 8 nd 18 re not required L 1 e1 SB H 2 c2 e2 UL.3 Repetition LAE1 1 2 12 13 14 15 16 17 19 18 8 9 4 3 22 * * L2 Repetition LF + c2 EK2 e2 /c2 P LP 716103/0202 e1 R1 W 1 100% LK 2 11 12 3 6 z 20 21 5 6 10 BS I II IV III 4 5 7 8 0% 33% 38% R2 d1 15 17 13 14 16 31% 46% (SQ...) OV3 Z (OV) UL.2 7 11 OV2 d1 Control switch «BS» I ominl lod II Stop III Low-fire lod IV Automtic control Air dmper control (in detil) 22/ 21/d1 21/d1/ BS/R2 18/ 20 "" A B C DE "kl.fl." "z" t11 t1 t12 t11 7161d04/0998 A B C D E F G H I K L t8 1 Kl.3 t7 2 LK 17 t11 22/21 t1 t12 SA Z 6 t3 (OV) OV2 10 7 t4 OV3 11 t9 FW 13/14 L2 12 Legend t6 t6 t7 t1 SA t3 t4 t5 t9 7161d05/1098 t5 A Strt G-H Opertion A-B orml strtup H Loss of flme B-C Opertion H-I Fult C Controlled shutdown I Reset C-D Postpurging I-K Return to strt position D-E Closing the ir dmper K Restrt E-F Burner off period K-L Strtup F Restrt L Opertion F-G Strtup 14/17
Connection exmples (cont d) Connection digrm for modulting urner control with checked ctutor control. Burners designed for modulting urner control lso use the devices of the temperture or pressure control loop, in ddition to the stndrd urner control equipment. Exmple: - odulting controller (1x) with 3-position output - emperture or pressure sensor QA... / QB... - Actutor (1x) for the control of the ir dmper nd oil throughput rtio control SQ... - Auxiliry rely (1x) d1 - Opertion mode switch (1x) BS - Oil volume controller (1x) RV * When using n ir pressure switch LP, the connections etween terminls 3 nd 4 nd 8 nd 18 re not required LAE1 e1 L 1 1 2 13 14 15 16 12 19 18 8 9 4 3 20 22 21 * * SB e1 H 2 c2 e2 LF + EK2 L2 /c2 P LP R W I d1 II LK 716104/1098 BS IV III 11 1 2 z 12 RV SQ... 10 11 17 6 5 7 e2 Q... c2 d1 OV1 Z 7161s03e/0199 SQ... Control of semiutomtic operting mode his circuit is used when, for specific resons, fully utomtic opertion is not desired. L 18 8 9 W Exmple: Industril urners he urner is strted y pressing utton I (.O.). Burner shutdown is chieved either y pressing utton 0 (.C.) or when there is response from the limit thermostt. 716105/1098 I 0 DK Air pressure switch LP (Recommended for urners tht use seprte motors for the fn nd the fuel pump). he ir pressure is continuously monitored from urner strtup through 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, lockout will e initited. If ir pressure switch LP is connected s shown in the djcent digrm, n utomtic functionl check is mde prior to ech strt. If the contct position is wrong, there will e no strt. e (17) 3 4 8 9 18 19 x. 5 A P W c LP ~ 716106en/0316 R 0.1 A 15/17
Legend AR BR BS c... d... DK e... EK1 EK2 FR FW H L L1 L2 LF LK LP... C OV... (OV) R RV SB S UL1 UL2 UL3 W Z Lod rely with contcts «r...» Lockout rely with contcts «r...» Opertion switch Fn contctor with contcts «c...» Auxiliry rely with contcts «d...» Push-utton herml overcurrent relese Lockout reset utton on the LAE1... (do not press «EK1» for more thn 10 s!) Remote lockout reset utton (do not press «EK2» for more thn 10 s!) Flme rely with contcts «fr...» Flme supervision in switch Lmp Fult indiction lmp (integrted) Fult indiction lmp (externl) Light detector (silicon photocell detector RAR9...) Actutor with end or uxiliry switches = ctutor trvels to the «fully open» position (mx. ir volume) z = ctutor trvels to the «fully closed» position (min. ir volume) Air pressure switch Fn, ventiltor High temperture conductor (dely device) Oil vlve Fuel vlve for pilot urner, will e switched off on completion of the second sfety time Control thermostt or pressurestt Control vlve Sfety limit thermostt Synchronous motor of sequence switch Operting switch for sequence switch motor (only ccessile when cover is removed) Chngeover ltch for «long / short» preignition time Chngeover ltch for «with / without» repetition Limit thermostt or pressure switch Ignition trnsformer 16/17
Dimensions Dimensions in mm LAE1... LAE1... AGG41041713 (AE) AGG11.1 81.9 A B A A A C C C o remove the LAE1... from its plug-in se, it is merely necessry to loosen the 4 screws «A». o remove the unit cover, lso loosen the 2 screws «B». Legend C SG EK Elongted holes for fixing the plug-in se Viewing window Lockout reset utton 2018 Siemens AG, Berliner Ring 23, D-76437 Rsttt Suject to chnge! 17/17