LOA2... LOA3... Oil Burner Controls. Siemens Building Technologies Landis & Staefa Division
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1 7 8 ISO 900 LOA2... LOA... Oil Burner Controls LOA2... LOA... Oil burner controls for the supervision, startup and control of single- or twostage oil burners with an oil throughput of up to 0 kg/h in intermittent operation. The LOA2... / LOA... and this data sheet are intended for use by OEs which integrate the oil burner controls in their products. Use - Oil burners with / without oil pre-heaters - Forced draught oil burners conforming to E 267, with an oil throughput of up to 0 kg/h - Oil atomization burners as monoblocks conforming to E 20, with an oil throughput of up to 0 kg/h - Special versions including models for incinerator plants and flash-steam generators CC78en Landis & Staefa Division
2 arning notes To avoid injury to persons, damage to property or the environment, the following warning notes should be observed. It is not permitted to open, interfere with or modify the unit. Before performing any wiring changes in the connection area of the LOA..., the burner control must be completely isolated from the mains supply Ensure protection against electric shock hazard by providing adequate protection when mounting the burner control Check wiring and all safety functions Press the lockout reset button only manually, without using any tools or pointed objects Fall or shock can adversely affect the safety functions. Such units may not be put into operation, even if they do not exhibit any damage ounting notes The relevant national safety regulations must be complied with Installation notes Installation and commissioning work may only be carried out by qualified staff Observe the permissible lengths of the flame detector cables; refer to data sheets 77 (QB...) and 776 (QC...) Always run ignition cables separately while observing the greatest possible distances to the unit and to other cables Do not mix up live and neutral conductors Commissioning notes Commissioning and maintenance work may only be carried out by qualified staff hen commissioning the plant, when carrying out maintenance work, or after longer off periods, make the following safety checks: a) Burner startup with darkened flame detector Lockout at the end of «TSA» b) Burner startup with flame detector exposed to extraneous light c) Simulation of flame failure during operation. For that purpose, darken the flame detector during operation and maintain this status. Lockout at the end of the pre-purge time estart followed by lockout at the end of «TSA» 2/0 CC78en Landis & Staefa Division
3 echanical design LOA... The oil burner controls are of plug-in design. The housing is made of impact-proof and heat-resistant plastic and accommodates the - thermal-electric sequence switch which acts on a multiple snap-action switching system - flame signal amplifier with the flame relay - lockout reset button with the integrated fault indication lamp AGK plug-in base AGK65 cable gland holder AGK66 cable holder AGK67... cable holder QB... photoresistive detectors QC... blue-flame detectors efer to data sheet 720. efer to data sheet 720. efer to data sheet 720. efer to data sheet 720. efer to data sheet 77. efer to data sheet 776. Type summary The type references given below apply to burner controls without base and without flame detector. Version Voltage (VAC) Type reference Undervoltage detection CE t t TSAmax. tn tn t eplacement for Standard version 220 LOA2.7B27 ²) X x LAI2. 0 LOA2.7B7 ²) X x LOA2.7A27 X x LAI LOA2.7A27 X x ith remote reset 220 LOA26.7B27 ²) X x facility 220 LOA6.7A27 X x For flash-steam generators For incinerator plant boilers and similar applications 220 LOA2.57C27 X x LAI5 220 LOA25.7C27 ¹) X LAB2 0 LOA25.7C7 ¹) X LOA28.7A27 ¹) X Legend ¹) Since LOA25... and LOA28... do not feature extraneous light lockout, they do not conform to E 20 ²) It is also possible to use an ID00 infrared flicker detector t t tn tn t TSA Pre-purge time Pre-ignition time Long post-ignition time Short post-ignition time Interval from establishment of flame to the release of the 2 nd fuel valve Ignition safety time /0 CC78en Landis & Staefa Division
4 Ordering Oil burner control without plug-in base Photoresistive detectors (refer to data sheet 77) Blue-flame detectors (refer to data sheet 776) Plug-in base (refer to data sheet 720) Cable gland holder (refer to data sheet 720) Cable holder (refer to data sheet 720) Cable holder (refer to data sheet 720) refer to «Type summary» QB... QC... AGK AGK65 AGK66 AGK67... Pedestal (empty housing) To increase the overall height of the LOA...to that of the LAI... / LAB... emote reset module For use with the LOA26... / LOA6... printed circuit board versions Adapter For replacing LAB... / LAI... by LOA... o rewiring of the plug-in base required AGK2 AK2A27 KF889 Test adapter - ith signal lamps for program indication - For functional check - ith 2 jacks for measuring the flame detector current KF88 Test adapter KF880 - ith signal lamps for program indication - ith holes for checking the control voltages at the tabs of the LOA2... / LOA... - ith 2 jacks for measuring the flame detector current - ith on / off switch for simulating the flame signal Test adapter - ith switch for manual burner startup - ith switch for simulating the oil pre-heater s release contact - ith 2 pairs of jacks for measuring the flame detector current KF8885 /0 CC78en Landis & Staefa Division
5 Technical data General unit data ains voltage AC 220 V 5 %...AC 20 V +0 % AC 00 V 5 %...AC 0 V +0 % ains frequency Hz ±6 % External primary fuse (Si) 0 A (fast) Power consumption approx. VA Degree of protection IP 0 ounting orientation optional eight approx. 80 g Input current to - terminal - terminal 5 A (short-time 5 A for max. 0.5 s) 5 A (excl. current draw of burner motor and oil pre-heater) Perm. terminal loading LOA2.7B27 LOA2.7B7 LOA2.57C27 LOA25.7C27 LOA25.7C7 LOA28.7A27 LOA2.7A27 LOA2.7A27 Terminal Terminal 5 Terminal 6 Terminal 7 Terminal 8 Terminal 0 A A 2 A 2 A 5 A A A A 2 A.5 A 5 A A LOA26.7B27 A A 2 A 0. A 5 A A LOA6.7A27 Environmental conditions Transport IEC Climatic conditions class 2K2 Temperature range C Humidity < 95 % r.h. Operation IEC 72-- Climatic conditions class K5 echanical conditions class 22 Temperature range C Humidity < 95 % r.h. Condensation, formation of ice and ingress of water are not permitted! CE conformity According to the directives of the European Union Electromagnetic compatibility EC 89 / 6 EEC incl. 92 / EEC Low voltage directive 7 / 2 EEC 5/0 CC78en Landis & Staefa Division
6 Flame detectors For measurement circuits and detector cable lengths, refer to data sheets 77 (QB...) and 776 (QC...). QB... Type of burner control QB... (typically) in. detector current required (with flame) ¹) ax. perm. detector current (without flame) ax. detector current possible (with flame) LOA2.7B27 / LOA2.7B7 LOA2.57C27 LOA25.7C27 / LOA25.7C7 70 µa 5.5 µa 20 µa LOA26.7B27 LOA28.7A27 LOA2.7A27 5 µa 5.5 µa 5 µa LOA2.7A27 LOA6.7A27 70 µa 5.5 µa 900 µa QC... Type of burner control QC... (typically) in. detector current required (with flame) ¹) ax. perm. detector current (without flame) ax. detector current possible (with flame) LOA2.7B27 LOA2.57C27 70 µa 5.5 µa 0 µa LOA26.7B27 LOA2.7B7 70 µa 5.5 µa 90 µa LOA25.7C27 / LOA25.7C7 ¹) LOA28.7A27 ¹) LOA2.7A27 5 µa 5.5 µa 5 µa LOA2.7A27 LOA6.7A27 70 µa 5.5 µa 0 µa ¹) These types of LOA... may not be used in connection with the QC...blue-flame detectors Only with LOA6... Indication of flame strength - Detector current LED lit with QB... - Detector current LED lit with QC... min. 60 µa ±5 % min. 0 µa ±5 % 6/0 CC78en Landis & Staefa Division
7 Functions Control sequence in the event of fault Extraneous light / premature flame signal henever a fault occurs, the supply of fuel will immediately be shut down. ith every lockout, the control outputs will be de-energized in less than one second, while terminal 0 («AL») for remote lockout indication receives voltage. The LOA... can be reset no earlier than approx. 50 seconds after lockout. o flame signal may be present during the pre-purge time. If, however, a signal is delivered during this period of time, the LOA... locks out on completion of the pre-purge and safety time, and there will be no release of oil. An erroneous flame signal can be caused by - premature establishment of the flame due to a leaking oil valve - extraneous light - a short-circuit in the flame detector or flame detector cable - faults in the flame signal amplifier, or similar Exception: ith LOA25... / LOA28..., there will be no lockout, but burner startup will be prevented until the premature flame signal is no longer present. This means that the LOA25... / LOA28... may be used only where the requirements of E 20 need not be satisfied. on-appearance of flame Flame failure during operation Undervoltage detection If, at the end of «TSA», there is no flame signal, the LOA... will immediately lock out. If, with the LOA25... / LOA28..., there are flame signal failures of short duration during «TSA» and «t», the ignition transformer will automatically be switched on again. The total duration of the repeated ignition attempts equals «TSA» (0 seconds). On flame failure during operation, the LOA... will immediately shut down the fuel supply and automatically make a restart attempt (repetition). If flame failure occurs on completion of «t», nearly the complete startup sequence will be repeated. ith burner controls featuring undervoltage detection, an additional electronic circuit ensures that if mains voltage drops below about 65 V, burner startup will be prevented, or without opening the oil valve lockout will be triggered. Indications Fault position Flame strength The fault position is indicated with the lamp integrated in the lockout reset button. Only with LOA6... Indication of the flame strength (green LED) is used for checking the flame signal. This LED must be lit to ensure reliable burner operation. If the green LED flickers or extinguishes during burner operation, the light conditions at the burner are inadequate, caused by dirt for instance. Operation Only with LOA6... If the contact of the temperature controller is closed, the orange LED is lit, indicating the beginning of the oil pre-heater s heating up phase (if present). 7/0 CC78en Landis & Staefa Division
8 Connection diagram and internal diagram Control sequence LOA2.7B27 LOA2.7B7 LOA2.57C27 EK Si L tz2 L b a fr a b c d e T AL tz K BV F V bl QB QC br sw 78a06/0600 A A B C D BV FS tw t t TSA 78d0/000 tn t LOA2.7A27 LOA2.7A27 EK tz2 L b a fr a b tz c d e K F V 78a07/0600 A A B C D 8 Si L T AL BV bl QB QC br sw BV FS tw tn t tn t TSA t 78d0/ LOA25.7C27 LOA25.7C7 LOA28.7A27 EK tz2 L b a fr** a b tz c d e K F V 78a0/0600 A A B C D 8 LOA25.7C27 LOA25.7C7 LOA28.7A27 Si L 2 0 AL 8 T 7 6 BV QB... BV FS tw t tn t TSA t 78d02/ fr** ot provided with the LOA28.7A27 8/0 CC78en Landis & Staefa Division
9 Connection diagram and internal diagram LOA26.7B27 LOA6.7A27 ith AK2 remote lockout reset module EK tz2 L b a fr a b tz c d e K F V 78a08/0600 EK tz2 L b a fr a b tz c d e K F V LED 78a09/0600 T L2 T Si L AL SA BV 0 bl QB QC br sw Si L AL SA BV 0 bl QB QC br sw AK2A27 EK AK2A27 EK2 Control sequence A A B C D 8 tn tw t 6 SA BV t TSA t 7 5 FS 78d05/000 2 Legend AL Alarm device Oil pre-heater BV... Fuel valve QB Photoresistive detector EK Lockout reset button QC Blue-flame detector EK2 emote lockout reset button bl = blue F Flame relay with contacts «fr» br = brown fr Bridging contact for release contact of sw = black FS Flame signal Pressurestat K Catch of flame relay for locking contact «tz» SA Actuator with automatic setback in the event of premature flame signals or for locking this Safety limit thermostat contact when the flame signal is correct Si External primary fuse L Indication of faults (red) T Thermal-electric sequence switch L2 Indication of operation (green) tz... Contacts of «T» LED Indication of flame strength (green) Limit thermostat or pressure monitor Burner motor V Flame signal amplifier elease contact of oil pre-heater Ignition transformer t Pre-purge time t Interval «BV-» t Pre-ignition time TSA Ignition safety time tn Long post-ignition time tw aiting time for oil pre-heating tn Short post-ignition time A Beginning of the startup sequence with burners using an oil pre- B Time of flame establishment heater C unning position A Beginning of the startup sequence with burners using C-D Burner operation no oil pre-heater D Controlled shutdown by Control signals delivered by the LOA... equired input signals 9/0 CC78en Landis & Staefa Division
10 Dimensions Dimensions in mm LOA... with AGK plug-in base and AGK65 cable gland holder 5,5 62, , m0/000 only LOA... xxxxxxxxxx 7 62,5 xxxxxxxxxx 7 62, ,5 78m0/000 AGK plug-in base , 6,2 2 78m02/ ,5 62,5 AGK Plug-in base with screw terminals «A»: holes for fastening screws «B»: holes for cable entry «C»: earthing lug and «2»: auxiliary terminals : neutral terminals, connected to the neutral input (terminal 2),5 0, A B C Underneath: earth conductor terminals, joining in a lug for earthing the burner Hatched: position of insertable AGK65 cable gland holder or AGK66 cable holder Connection of earthing lug «C» and of fixing screw in «A» to the burner s ground (using a metric screw with a lockwasher or similar! AK2A27 remote lockout reset module m0/000 8,5 67, emote lockout reset module for use with the LOA26... / LOA6... Printed circuit board with no housing. Degree of protection IP 00, which means that protection against electric shock hazard must be ensured through mounting. Do not place any metal objects in the hatched area. The module must be fitted with the help of spacers made of plastic. Do not use spacers made of metal Siemens Landis & Staefa Produktion GmbH 0/0 CC78en Landis & Staefa Division
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