LOA2... LOA... Oil Burner Controls LOA2... LOA... Oil burner controls for the supervision, startup and control of - or 2-stage forced draft oil burners in intermittent operation. Oil throughput up to 0 kg/h. The LOA2... / LOA... and this Data Sheet are intended for use by OEs which integrate the oil burner controls in their products. Use, features Use The LOA... are used for the startup, supervision and control of - or 2-stage forced draft oil burners in intermittent operation. Yellow-burning flames are supervised with photoresistive detectors QB..., blueburning flames with blue-flame detectors QC... - Forced draft oil burners conforming to E 2 - Oil atomization burners in monoblock design conforming to E 20: 99 General features Specific features - Undervoltage detection - Bridging contact for oil preheater (not with LOA2.A2) - Special versions including models for incinerator plant and flash-steam generators - LOA... with color LED for indicating flame strength and operation CCen 2.0.200 HVAC Products
arning notes To avoid injury to persons, damage to property or the environment, the following warning notes must be observed! Do not open, interfere with or modify the unit! All activities (mounting, installation and service work, etc.) must be performed by qualified staff Before making any wiring changes in the connection area, completely isolate the plant from mains supply (all-polar disconnection). Ensure that the plant cannot be inadvertently switched on again and that it is indeed dead. If not observed, there is a risk of electric shock hazard Ensure protection against electric shock hazard by providing adequate protection for the burner control s connection terminals Each time work has been carried out (mounting, installation, service work, etc.), check to ensure that wiring is in an orderly state and make the safety checks as indicated in «Commissioning notes» above Press the lockout reset button / operating button only manually (applying a force of no more than 0 ), without using any tools or pointed objects Fall or shock can adversely affect the safety functions. Such units must not be put into operation, even if they do not exhibit any damage ounting notes Ensure that the relevant national safety regulations are complied with Installation notes Do not mix up live and neutral conductors Always run high-voltage ignition cables separately while observing the greatest possible distance to the unit and to other cables Install switches, fuses, earthing, etc., in compliance with local regulations Ensure that the maximum permissible amperages will not be exceeded (refer to «Technical data») Electrical connection of flame detectors It is important to achieve practically disturbance- and loss-free signal transmission: ever run the detector cable together with other cables Line capacitance reduces the magnitude of the flame signal Use a separate cable Observe the permissible lengths of the flame detector cables (refer to Data Sheets (QB...) and (QC...)) Earth the burner in compliance with the relevant regulations; earthing the boiler alone does not suffice Commissioning notes hen commissioning the plant, when carrying out maintenance work, or after longer off periods, make the following safety checks: Safety check to be carried out a) Burner startup with flame detector darkened 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 state Anticipated response Lockout at the end of «TSA» Lockout after approx. 0 seconds epetition followed by lockout at the end of «TSA» 2/ CCen
Standards and certificates Conformity to EEC directives - Electromagnetic compatibility EC (immunity) - Low-voltage directive 200/0/EC 200/9/EC ISO 900: 2000 Cert. 009 ISO 00: 200 Cert. 2 Service notes Use the KF... service adapter for short periods of time only Life cycle Burner controls LOA... has a designed lifetime* of 20,000 burner startup cycles which, under normal operating conditions in heating mode, correspond to approx. 0 years of usage (starting from the production date given on the type field). This lifetime is based on the endurance tests specified in standard E20 and the table containing the relevant test documentation as published by the European Association of Component anufacturers (Afecor) (www.afecor.org). The designed lifetime is based on use of the burner controls according to the manufacturer s Data Sheet. After reaching the designed lifetime in terms of the number of burner startup cycles, or the respective time of usage, the burner control is to be replaced by authorized personnel. * The designed lifetime is not the warranty time specified in the Terms of Delivery Disposal notes The unit contains electrical and electronic components and must not be disposed of together with domestic waste. Local and currently valid legislation must be observed. echanical design The housing is made of impact-proof, heat-resistant and flame-retarding plastic. The oil burner control is of plug-in design and engages audibly in its base. The color of plastic material of burner controls LOA... are executed in black. The housing accommodates the - thermal-electric sequence switch - flame signal amplifier with the flame relay - lockout reset button with its integrated fault indication lamp / CCen
Type summary The type references given below apply to oil burner controls without base and without flame detector. For ordering information on plug-in bases and other accessories, refer to «Ordering». Deliverable version Type reference ain voltage Undervoltage detection t t TSAmax. tn tn t Standard version LOA2.B2 ²) AC 220 V x s s 0 s 20 s --- 20 s LOA2.B ²) AC 0 V x s s 0 s 20 s --- 20 s LOA2.A2 AC 220 V x s s 0 s 20 s 2 s 20 s ith remote reset facility LOA2.B2 ²) AC 220 V x s s 0 s 20 s --- 20 s LOA.A2 AC 220 V x s s 0 s 20 s --- 20 s For incinerator plant LOA2.C2 ¹) AC 220 V x s s 0 s --- 2 s 20 s LOA2.A2 ¹) AC 220 V x s s 0 s --- 2 s 20 s Legend ¹) LOA2... and LOA2... are designed for use on incinerator plant where lockout by extraneous light is not desired. These types of oil burner controls are not covered by E 20 ²) ID00 infrared flicker detectors can also be used t t tn tn t TSAmax. Prepurge time Preignition time Long postignition time Short postignition time Interval from establishment of flame to the release of ax. Ignition safety time / CCen
Ordering Oil burner control without plug-in base Connection accessories for small burner controls - Plug-in base AGK... - Cable holders AGK..., AGK, AGK... - Cable strain relief elements for AGK... Connection accessories for small burner controls - Plug-in base AGK - Plug-in housing AGK - Cover AGK refer to «Type summary» refer to Data Sheet 20 refer to Data Sheet 20 Flame detectors - Photoresistive detectors QB... refer to Data Sheet - Blue-flame detectors QC... refer to Data Sheet Demo case KF9 efer to Operating Instructions B99 - For showing the functioning of burner controls Pedestal AGK2 (empty housing) - To increase the overall height of the LOA...to that of the LAI... / LAB... emote reset module AK2A2 - For use with the LOA2... / LOA... printed circuit board versions Adapter KF9 - For replacing LAB... / LAI... by LOA... - o rewiring of plug-in base required Test adapter KF - For checking the functions of burner controls on the burner - ith signal lamps for program indication - ith one pair of jacks for measuring the flame detector current Test adapter KF0 - For checking the functions of burner controls on the burner - ith signal lamps for program indication - ith on / off switch for simulating the flame signal - ith holes for checking the control voltages at the tabs of the burner control - ith one pair of jacks for measuring the flame detector s resistance Test adapter KF - For checking the functions of burner controls on the burner - ith switch for manual startup of burner - ith switch for simulating the oil preheater s release contact - ith 2 pairs of jacks for measuring the flame detector current - efer to ounting Instructions B9 / CCen
Technical data General unit data ains voltage AC 220 V %...AC 20 V +0 % AC 00 V %...AC 0 V +0 % ains frequency 0...0 Hz ± % External primary fuse (Si) 0 A (fast) Power consumption Approx. VA Perm. mounting position Optional eight Approx. 0 g Degree of protection IP0, must be ensured through mounting Safety class I (burner control with plug-in base) Perm. cable lengths - Detector cable laid separately - emote reset laid separately Input current to - - ax. m with 00 pf/m line capacitance ax. 20 m ax. 20 m A (short-time A for max. 0. s) A (excl. current draw of burner motor and oil preheater) Perm. current at cos ϕ 0. LOA2.B2 LOA2.B LOA2.C2 LOA2.A2 0 ax. A ax. A ax. 2 A ax. 2 A ax. A ax. A LOA2.A2 ax. A ax. A ax. 2 A ax.. A ax. A ax. A LOA2.B2 ax. A ax. A ax. 2 A ax. 0. A ax. A ax. A LOA.A2 Environmental conditions Storage DI E 02-- Climatic conditions Class K echanical conditions Class 2 Temperature range -20...+0 C Humidity <9 % r.h. Transport DI E 02--2 Climatic conditions Class 2K2 echanical conditions Class 22 Temperature range -0...+0 C Humidity <9 % r.h. Operation DI E 02-- Climatic conditions Class K echanical conditions Class 2 Temperature range -20...+0 C Humidity <9 % r.h. Condensation, formation of ice and ingress of water are not permitted! / CCen
Technical data (cont d) Flame supervision with QB... or QC... QB... QC... For measuring circuits and detector cable lengths, refer to Data Sheets (QB...) and (QC...). Type of burner control LOA2.B2 / LOA2.B LOA2.C2 LOA2.B2 LOA2.A2 equired detector current required (with flame) QB... (typically) Perm. detector current (without flame) Detector current possible (with flame) in. 0 µa ax.. µa ax. 20 µa LOA2.A2 in. µa ax.. µa ax. µa LOA.A2 in. 0 µa ax.. µa ax. 900 µa Type of burner control LOA2.B2 LOA2.B2 equired detector current required (with flame) QC... (typically) Perm. detector current (without flame) Detector current possible (with flame) in.0 µa ax.. µa ax. 0 µa LOA2.B in. 0 µa ax.. µa ax. 90 µa LOA2.C2 ¹) LOA2.A2 ¹) --- --- --- LOA2.A2 in. µa ax.. µa ax. µa LOA.A2 in. 0 µa ax.. µa ax. 0 µa ¹) These types of LOA... must not be used in connection with QC...blue-flame detectors Data given in the above table only apply under the following conditions: - ains voltage depending on version AC 0 V or AC 20 V - Ambient temperature 2 C easuring circuit for detector current QB... 2 LOA... bl sw + µa DC QB... v0/002 QC... 2 LOA... bl sw br + µa DC QC... v02/002 Legend µa DC DC microammeter with an internal resistance of i = max. kω bl Blue sw Black br Brown Only with LOA... Indication of flame strength Detector current LED on - ith QB... - ith QC... in. 0 µa ± % in. 0 µa ± % / CCen
Function Preconditions for startup Undervoltage detection Control sequence in the event of fault Burner control is reset Contacts in the line are closed, heat demand o undervoltage Flame detector is darkened, no extraneous light An additional electronic circuit ensures that if mains voltage drops below approximately AC V, burner startup will be prevented, or without release of oil lockout will be triggered. henever lockout occurs, the outputs for the fuel valves, the burner motor, oil preheater and ignition equipment will immediately be deactivated (< second). The lockout indication lamp changes to red and terminal 0 («AL») for remote lockout indication receives voltage. This state is also maintained in the event of mains voltage failure. Cause ains voltage failure Extraneous light on burner startup o flame at the end of «TSA» Loss of flame during operation esponse estart Lockout; with LOA2... / LOA2...: Prevention of start Lockout epetition eset of burner control After lockout, the burner control can be reset after 0...90 seconds (also refer to «arning notes»). Indications Lockout position Flame strength The lockout position is indicated with the lamp integrated in the lockout reset button. Only with LOA... Indication of the flame strength (green LED) is used for checking the flame signal. To ensure reliable burner operation, this LED must be lit. If the green LED flickers or extinguishes during burner operation, the light conditions at the burner are poor, caused by dirt for instance. Operation Only with LOA... hen the contacts of the control thermostat are closed, the orange LED is lit, indicating the start of the oil preheater s heating up phase (if present). / CCen
Connection diagram inclusive internal diagram Control sequence LOA2.B2 LOA2.B EK L tz2 fr a b T 2 0 9 2 Si L x AL y z c d tz e f g K BV F V bl QB QC sw a0/00 A A B C D BV FS tw t t TSA d0/002 tn t 2 br LOA2.A2 EK L tz2 tz fr x y z a b c d e f g K F V a0/00 A A B C D T 2 0 9 2 Si L AL BV bl QB QC br sw BV FS tw tn t tn t TSA t d0/002 2 LOA2.C2 LOA2.A2 EK L tz2 x y z fr** a b c d tz e f g K F V a0/00 A A B C D 2 0 T 9 2 2 Si L AL BV QB.. BV FS tw t tn t TSA d02/002 t 2 fr** ot provided with the LOA2.A2 ) LOA2.C2 2) LOA2.A2 9/ CCen
Connection diagram inclusive internal diagram Control sequence LOA2.B2 ith AK2 remote lockout reset module EK tz2 tz fr L x y z c d e f g a b F K V T 2 0 9 2 a0/00 A A B C D tw t tn Si L AL SA BV 0 2 0 9 AK2A2 EK2 bl QB QC br sw SA BV FS t TSA d0/002 t 2 LOA.A2 ith AK2 remote lockout reset module EK tz2 tz fr L x y z c d e f g LED a b F K V L2 T 2 0 9 2 a09/00 A A B C D tw t tn Si L AL SA BV 0 2 0 9 AK2A2 EK2 bl QB QC br sw SA BV FS t TSA d0/002 t 2 Legend AL Alarm device elease contact of oil preheater BV... Fuel valve Oil preheater EK Lockout reset button QB Photoresistive detector EK2 emote lockout reset button QC Blue-flame detector F Flame relay with contacts «fr» bl = blue, br = brown, sw = black fr Bridging contact for release contact of Control thermostat or pressurestat FS Flame signal SA Actuator with automatic setback K Catch of flame relay for locking contact «tz» Safety limit thermostat in the event of premature flame signals or for locking Si External primary fuse the contact when the flame signal is correct T Thermal-electric sequence switch L Indication of faults (red) tz... Contacts of «T» L2 Indication of operation (orange) Limit thermostat or pressure switch LED Indication of flame strength (green) V Flame signal amplifier Burner motor Ignition transformer TSA Ignition safety time A Beginning of the startup sequence with burners using an tw aiting time A Beginning of the startup sequence with burners using no t Prepurge time B Time of flame establishment t Preignition time C unning position tn Long postignition time D Controlled shutdown by tn Short postignition time Control signals delivered by the LOA... t Interval between flame signal and release of equired input signals Permissible input signals 0/ CCen
Dimensions Dimensions in mm LOA... 22, 2, 9, 2, 9 m0/020 Plug-in base AGK... / AGK... LOA2... LOA... Status indication (orange) Indication of flame strength (green) 2 2,, 0 2, 22, m0/00 emote lockout reset module AK2A2 + + m0/000 emote lockout reset module for use with the LOA2... / LOA... Printed circuit board with no housing. Degree of protection IP00, 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. 200 Siemens HVAC Products GmbH Subject to change! / CCen