LOA2... LOA3... Oil Burner Controls. Siemens Building Technologies HVAC Products

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1 ISO 900 LOA2... LOA... Oil Burner Controls LOA2... LOA... Oil burner controls for the supervision, startup and control of single- 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 single- 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 as monoblocks conforming to E 20 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 HVAC Products

2 arning notes To avoid injury to persons, damage to property or the environment, the following warning notes should be observed! Do not open, interfere with or modify the unit! Before performing any wiring changes in the connection area of the LOA..., completely isolate the unit from the mains supply (all-polar disconnection) Ensure protection against electric shock hazard by providing adequate protection for the burner control s connection terminals Check to ensure that wiring is in an orderly state and that the wires are firmly connected 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 may 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 Installation and commissioning work must be carried out by qualified staff 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 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...)) Commissioning notes Commissioning work must 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: Safety check 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» 2/0 CCen HVAC Products

3 Standards Conformity to EEC directives Electromagnetic compatibility EC (immunity) 9 / EEC Low-voltage directive / 2 EEC Service notes aintenance work must be carried out by qualified staff Each time a unit has been replaced, check wiring to ensure it is in an orderly state and that the wires are firmly connected; make the safety checks as indicated in «Commissioning notes» above Use the KF... test adapters for short periods of time only Disposal notes echanical design The unit contains electrical and electronic components and may not be disposed of together with household waste. Local and currently valid legislation must be observed. 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 housing accommodates the - thermal-electric sequence switch - flame signal amplifier with the flame relay - lockout reset button with its integrated fault indication lamp Type summary The type references given below apply to burner controls without base and without flame detector. Version Type reference Voltage (VAC) Undervoltage CE t t TSAmax. tn tn t eplacement for detection Standard version LOA2.B2 ²) 220 X x LAI2. LOA2.B ²) 0 X x LOA2.A2 220 X x LAI2. LOA2.A2 220 X x ith remote reset LOA2.B2 ²) 220 X x facility LOA.A2 220 X x For flash-steam LOA2.C2 220 X x LAI generators For incinerator plant LOA2.C2 ¹) 220 X LAB2 LOA2.C ¹) 0 X LOA2.A2 ¹) 220 X 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 TSA Prepurge time Preignition time Long postignition time Short postignition time Interval from establishment of flame to the release of Ignition safety time /0 CCen HVAC Products

4 Ordering Oil burner control without plug-in base refer to «Type summary» Electrical connections refer to Data Sheet 20 - Plug-in base AGK... - Cable holders AGK..., AGK, AGK... - Cable strain relief elements for AGK... Electrical connections refer to Data Sheet 20 - Plug-in base AGK - Plug-in housing AGK - Cover AGK Flame detectors - Photoresistive detectors QB... refer to Data Sheet - Blue-flame detectors QC... refer to Data Sheet Pedestal (empty housing) - To increase the overall height of the LOA...to that of the LAI... / LAB... emote reset module - For use with the LOA2... / LOA... printed circuit board versions Adapter - For replacing LAB... / LAI... by LOA... - o rewiring of plug-in base required AGK2 AK2A2 KF9 Demo case - For showing the functioning of burner controls - efer to Operating Instructions B99 Test case, for making functional tests - For testing burner controls - efer to Operating Instructions B9 Test adapter - For testing burner controls - 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 C9 Test adapter - For testing burner controls fitted to the burner - ith signal lamps for program indication - ith 2 jacks for measuring the flame detector current KF9 KF KF KF Test adapter - For testing burner controls fitted to the burner - ith signal lamps for program indication - ith switch for simulating the flame signal - ith holes for checking the control voltages at the tabs of the burner control - ith 2 jacks for measuring the flame detector s resistance KF0 /0 CCen HVAC Products

5 Technical data General unit data ains voltage AC 220 V %...AC 20 V +0 % AC 00 V %...AC 0 V +0 % ains frequency Hz ± % External primary fuse (Si) 0 A (fast) Power consumption approx. VA Degree of protection IP 0, must be ensured through mounting Safety class I Perm. cable lengths - Detector cable laid separately - emote reset laid separately ounting position eight Input current to - - max. m with 00 pf/m line capacitance max. 20 m max. 20 m optional approx. 0 g A (short-time A for max. 0. s) A (excl. current draw of burner motor and oil preheater) ax. perm. current at cos 0. LOA2.B2 LOA2.B LOA2.C2 LOA2.C2 LOA2.C LOA2.A2 LOA2.A2 LOA2.A2 0 A A 2 A 2 A A A A A 2 A. A A A LOA2.B2 A A 2 A 0. A A A LOA.A2 Environmental conditions Transport DI E Climatic conditions class 2K2 echanical conditions class 22 Temperature range C Humidity < 9 % r.h. Operation DI E Climatic conditions class K echanical conditions class 2 Temperature range C Humidity < 9 % r.h. Condensation, formation of ice and ingress of water are not permitted! /0 CCen HVAC Products

6 Flame detectors 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.C2 / LOA2.C LOA2.B2 LOA2.A2 LOA2.A2 LOA2.A2 in. detector current required (with flame) QB... (typically) ax. perm. detector current (without flame) ax. detector current possible (with flame) 0 µa. µa 20 µa µa. µa µa LOA.A2 0 µa. µa 900 µa Type of burner control LOA2.B2 LOA2.C2 LOA2.B2 in. detector current required (with flame) QC... (typically) ax. perm. detector current (without flame) ax. detector current possible (with flame) 0 µa. µa 0 µa LOA2.B 0 µa. µa 90 µa LOA2.C2 ¹) LOA2.C ¹) LOA2.A2 ¹) LOA2.A2 LOA2.A µa. µa µa LOA.A2 0 µa. µa 0 µa ¹) These types of LOA... may not be used in connection with QC...blue-flame detectors Data given in the above table only apply under the folllowing conditions: - ains voltage AC 20 V - Ambient temperature 2 C easuring curcuit for detector current QB... 2 LOA... bl sw + µa DC v0/002 QC... 2 LOA... bl sw br + µa DC v02/002 Legend µa DC DC microammeter with an internal resistance of i = max. k bl Blue sw Black br Brown QB... QC... Only with LOA... Indication of flame strength Detector current LED lit - ith QB... - ith QC... min. 0 µa ± % min. 0 µa ± % /0 CCen HVAC Products

7 Function Preconditions for startup Burner control is reset Contacts in the line are closed o undervoltage Flame detector is darkened, no extraneous light Undervoltage detection Control sequence in the event of fault 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 ew start Lockout; with LOA2... / LOA2...: Prevention of start Lockout epetition eset After lockout, the burner control can be reset after 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). /0 CCen HVAC Products

8 Connection diagram and internal diagram Control sequence LOA2.B2 LOA2.B LOA2.C2 EK Si L L x tz2 fr a b T AL y z c d tz e f g K BV F V bl QB QC br sw a0/002 A A B C D BV FS tw t t TSA d0/002 tn t 2 LOA2.A2 LOA2.A2 EK L tz2 tz fr x y z a b c d e f g K F V a0/002 A A B C D Si L T AL BV bl QB QC br sw BV FS tw tn t tn t TSA t d0/002 2 LOA2.C2 LOA2.C LOA2.A2 EK L tz2 x y z fr** a b c d tz e f g K F V a0/002 A A B C D 2 0 T 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 / LOA2.C 2) LOA2.A2 /0 CCen HVAC Products

9 Connection diagram and 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 a0/002 A A B C D tw t tn Si L AL SA BV 0 bl QB QC br sw SA BV t TSA t AK2A2 EK2 FS d0/002 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 a09/002 A A B C D tw t tn Si L AL SA BV 0 bl QB QC br sw SA BV t TSA t AK2A2 EK2 FS d0/002 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 (green) 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 t Interval between flame signal and release of Control signals delivered by the LOA... equired input signals Permissible input signals 9/0 CCen HVAC Products

10 Dimensions Dimensions in mm LOA m0/002 2,, 9, LOA2... LOA... xxxxxxxxxx 2, xxxxxxxxxx 2, 22, m0/000 Status indication, orange Indication of flame strength, green 2 2,, 0 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 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 Subject to change! 0/0 CCen HVAC Products