ARK21A27

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09.10.2002 Siemens Building Technologies HVAC Products ISO 9001 7118 Oil Burner Controls LOA2... LOA3... 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 30 kg/h. integrate the oil burner controls in their products. Use, features The LOA... are used for the startup, supervi sion and control of single- or 2-stage forced draft oil burners in intermittent operation. Yellow-burning flames are supervised with photoresistive detectors QRB..., blue- burning flames with blue-flame detectors QRC... - Forced draft oil burners conforming to EN 267 - Oil atomization burners as monoblocks conforming to EN 230 - Undervoltage detection - Bridging contact for oil preheater (not with LOA28.173A27) - Special versions including models for incinerator plant and flash-steam generators - LOA36... with color LED for indicating flame strength and operation Use General features Specific features

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Warning 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! /g183 Before performing any wiring changes in the connection area of the LOA..., com- pletely isolate the unit from the mains supply (all-polar disconnection) /g183 Ensure protection against electric s hock hazard by providing adequate protection for the burner control’s connection terminals /g183 Check to ensure that wiring is in an order ly state and that the wires are firmly con- nected /g183 Press the lockout reset button / operating button only manually (applying a force of no more than 60 N), without using any tools or pointed objects /g183 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 Mounting notes /g183 Ensure that the relevant national safety regulations are complied with Installation notes /g183 Installation and commissioning work must be carried out by qualified staff /g183 Do not mix up live and neutral conductors /g183 Always run high-voltage i gnition 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: /g183 Never run the detector cable together with other cables – Line capacitance reduces the magnitude of the flame signal – Use a separate cable /g183 Observe the permissible lengths of the fl ame detector cables (refer to Data Sheets Commissioning notes /g183 Commissioning work must be carried out by qualified staff /g183 When commissioning the plant, when carrying out maintenance work, or after longer off periods, make the following safety checks: Safety check Anticipated response a) Burner startup with flame detector darkened Lockout at the end of «TSA» b) Burner startup with flame detector exposed to extraneous light Lockout after approx. 40 seconds c) Simulation of flame failure during operation. For that purpose, darken the flame detector during operation and maintain this state Repetition followed by lockout at the end of «TSA»

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Standards Conformity to EEC directives Electromagnetic compatibility EMC (immunity) 89 / 336 EEC Low-voltage directive 73 / 23 EEC Service notes /g183 Maintenance work must be carried out by qualified staff /g183 Each time a unit has been replaced, check wi ring 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 /g183 Use the KF... test adapters for short periods of time only Disposal notes The unit contains electrical and elec tronic components and may not be disposed of together with household waste. Local and currently valid legislation must be observed. Mechanical 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 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) Under- voltage detection CE t1 t3 TSAmax. t3n t3n´ t4 Replacement for LOA24.171B27 ²) 220 X x 13 13 10 15 --- 15 LOA24.171B17 ²) 110 X x 13 13 10 15 --- 15 LAI2.3 LOA24.173A27 220 X x 13 13 10 20 2 20 LAI2.3 Standard version LOA24.174A27 220 X x 13 13 10 35 2 35 --- LOA26.171B27 ²) 220 X x 13 13 10 15 --- 15 ---With remote reset facility LOA36.171A27 220 X x 13 13 10 15 --- 15 --- For flash-steam generators LOA24.571C27 220 X x 6 6 10 20 --- 20 LAI5 LOA25.173C27 ¹) 220 X --- 13 13 10 --- 2 15 LAB2 LOA25.173C17 ¹) 110 X --- 13 13 10 --- 2 15 For incinerator plant LOA28.173A27 ¹) 220 X --- 13 13 10 --- 2 15 --- types of oil burner controls are not covered by EN 230 ²) IRD1010 infrared flicker detectors can also be used t1 Prepurge time t3 Preignition time t3n Long postignition time t3n´ Short postignition time Interval from establishment of flame to the release of «BV2» TSA Ignition safety time Legend

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Ordering Oil burner control without plug-in base refer to «Type summary» Electrical connections refer to Data Sheet 7201 - Plug-in base AGK11... - Cable strain relief elements for AGK67... Electrical connections refer to Data Sheet 7203 - Plug-in base AGK13 - Plug-in housing AGK56 - Cover AGK68 Flame detectors - Photoresistive detectors QRB1... refer to Data Sheet 7714 - Blue-flame detectors QRC1... refer to Data Sheet 7716 Pedestal (empty housing) AGK21 Remote reset module ARK21A27 Adapter KF8819 - No rewiring of plug-in base required Demo case KF8891 - For showing the functioning of burner controls - Refer to Operating Instructions B7989 Test case, for making functional tests KF8843 - For testing burner controls - Refer to Operating Instructions B7986 Test adapter KF8885 - For testing burner controls - With switch for manual startup of burner - With switch for simulating the oil preheater’s release contact - With 2 pairs of jacks for measuring the flame detector current - Refer to Mounting Instructions C7981 Test adapter KF8833 - For testing burner controls fitted to the burner - With signal lamps for program indication - With 2 jacks for measuring the flame detector current Test adapter KF8840 - For testing burner controls fitted to the burner - With signal lamps for program indication - With switch for simulating the flame signal - With holes for checking the control voltages at the tabs of the burner control - With 2 jacks for measuring the flame detector’s resistance

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Technical data Mains voltage AC 220 V –15 %...AC 240 V +10 % AC 100 V –15 %...AC 110 V +10 % Mains frequency 50...60 Hz ±6 % External primary fuse (Si) 10 A (fast) Power consumption approx. 3 VA Degree of protection IP 40, must be ensured through mounting Safety class I Perm. cable lengths - Detector cable laid separately - Remote reset laid separately max. 3 m with 100 pF/m line capacitance max. 20 m max. 20 m Mounting position optional Weight approx. 180 g Input current to - Terminal 1 - Terminal 3 5 A (short-time 15 A for max. 0.5 s) 5 A (excl. current draw of burner motor and oil preheater) Max. perm. current at cos /g106 /g179 0.6 Terminal Terminal Terminal Terminal Terminal Terminal LOA24.171B27 LOA24.171B17 LOA24.571C27 LOA25.173C27 LOA25.173C17 LOA28.173A27

1 A1 A2 A2 A5 A1 A

LOA24.173A27 LOA24.174A27 1A 1 A 2 A 1.5 A 5 A 1 A LOA26.171B27 2 A 0.1 A 5 A 1 A LOA36.171A27

1 A 1 A

Transport DIN EN 60 721-3-2 Climatic conditions class 2K2 Mechanical conditions class 2M2 Temperature range -50...+60 °C Humidity < 95 % r.h. Operation DIN EN 60 721-3-3 Climatic conditions class 3K5 Mechanical conditions class 3M2 Temperature range -20...+60 °C Humidity < 95 % r.h. Condensation, formation of ice and ingress of water are not permitted! General unit data Environmental conditions

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 For measuring circuits and detector cable lengths, refer to Data Sheets 7714 (QRB...) and 7716 (QRC...). QRB... (typically)Type of burner control Min. detector current required (with flame) Max. perm. detector current (without flame) Max. detector current possible (with flame) LOA24.171B27 / LOA24.171B17 LOA24.571C27 LOA25.173C27 / LOA25.173C17 LOA26.171B27 LOA28.173A27 70 µA 5.5 µA 210 µA LOA24.173A27 LOA24.174A27 45 µA 5.5 µA 45 µA LOA36.171A27 70 µA 5.5 µA 900 µA QRC... (typically)Type of burner control Min. detector current required (with flame) Max. perm. detector current (without flame) Max. detector current possible (with flame) LOA24.171B27 LOA24.571C27 LOA26.171B27 70 µA 5.5 µA 110 µA LOA24.171B17 70 µA 5.5 µA 90 µA LOA25.173C27 ¹) LOA25.173C17 ¹) LOA28.173A27 ¹) --- --- --- LOA24.173A27 LOA24.174A27 45 µA 5.5 µA 45 µA LOA36.171A27 70 µA 5.5 µA 110 µA tors Data given in the above table only apply under the folllowing conditions: - Mains voltage AC 230 V - Ambient temperature 23 °C 1211 LOA... bl µA DC QRB... 7118v01/0102sw 1211 LOA...1 swbl br µA DC QRC1... 7118v02/0102 Legend µA DC DC microammeter with an internal resistance of Ri = max. 5 k/g87 bl Blue sw Black br Brown Detector current LED lit - With QRB... - With QRC... min. 60 µA ±15 % min. 40 µA ±15 % Flame detectors QRB... QRC1... Measuring curcuit for detector current Only with LOA36... Indication of flame strength

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Function /g183 Burner control is reset /g183 Contacts in the line are closed /g183 No undervoltage /g183 Flame detector is darkened, no extraneous light An additional electronic circuit ensures that if mains voltage drops below approximately AC 165 V, burner startup will be prevented, or – without release of oil – lockout will be triggered. Whenever lockout occurs, the outputs for the fuel valves, the burner motor, oil prehea- ter and ignition equipment will immediately be deactivated (< 1 second). The lockout indication lamp changes to red and terminal 10 («AL») for remote lockout indication receives voltage. This state is also maintained in the event of mains voltage failure. Cause Response Mains voltage failure New start tion of start No flame at the end of «TSA» Lockout Loss of flame during operation Repetition After lockout, the burner control can be reset after 60...90 seconds (also refer to «Warning notes»). Indications The lockout position is indicated with the lamp integrated in the lockout reset button. Only with LOA36... 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 dur ing burner operation, the light conditions at the burner are poor, caused by dirt for instance. Only with LOA36... When 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). Preconditions for startup Undervoltage detection Control sequence in the event of fault Reset Lockout position Flame strength Operation

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Connection diagram and internal diagram Control sequence LOA24.171B27 LOA24.171B17 LOA24.571C27 EK1 7118a06/0402 12 10 83 76 4 5 9 11 12 ba tz2 TZ tz1 K FR V fr W SB R Si L N OW OH N M Z BV2 QRB bl QRC sw br1 AL BV1 x y z d e f gc R SB W OH OW M Z BV1 BV2 FS A BC D tw t1 t3n TSA 7118d04/0402 LOA24.173A27 LOA24.174A27 EK1 7118a07/0402 12 10 8 37 6 4 5 9 11 12 ba tz2 TZ c tz1 K d e FR V fr W SB R Si L N OW OH N M Z BV2 QRB bl QRC sw br1 AL BV1 x y z f g R SB W OH OW M Z BV1 BV2 FS A BC D tw t1 t3n´ t3n TSA 7118d01/0402 LOA25.173C27 LOA25.173C17 LOA28.173A27 EK1 7118a10/0402 SB W R Si L N 21 0 AL OW OH M Z BV1 BV2 91 1 1 2 QRB. ba tz2 TZ c tz1 K de FR V frx y z f g R SB W OH OW OW M Z BV1 BV2 FS A BC D tw t1 t3n´ TSA 7118d02/0402 fr Not provided with the LOA28.173A27 1) LOA25.173C27 / LOA25.173C17 2) LOA28.173A27

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Connection diagram and internal diagram Control sequence LOA26.171B27 With ARK21 remote lockout reset module EK1 7118a08/0402 1 2 10 8 37 6 4 59 1 1 1 2 ba tz2 TZ c tz1 K d e FR V fr W SB R Si L N OW OH N M Z BV2 QRB bl QRC sw br1 AL BV1 EK2 2 1013 ARK21A27 SA N x yz fg R SB W OH OW M Z BV1 BV2 FS A´ AB C D tw t1 t3n TSA 7118d05/0402 SA LOA36.171A27 With ARK21 remote lockout reset module EK1 7118a09/0402 1 2 10 8 37 6 4 59 1 1 1 2 ba tz2 TZ c tz1 K d e FR V fr W SB R Si L N OW OH N M Z BV2 QRB bl QRC sw br1 AL BV1 EK2 2 1013 ARK21A27 SA N LED1f gxy z R SB W OH OW M Z BV1 BV2 FS A´ AB C D tw t1 t3n TSA 7118d05/0402 SA AL Alarm device OW Release contact of oil preheater BV... Fuel valve OH Oil preheater EK1 Lockout reset button QRB Photoresistive detector EK2 Remote lockout reset button QRC Blue-flame detector FR Flame relay with contacts «fr» bl = blue, br = brown, sw = black fr Bridging contact for release contact of «OH» R Control thermostat or pressurestat FS Flame signal SA Actuator with automatic setback K Catch of flame relay for locking contact «tz1» SB 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 TZ Thermal-electric sequence switch L1 Indication of faults (red) tz... Contacts of «TZ» L2 Indication of operation (green) W Limit thermostat or pressure switch LED1 Indication of flame strength (green) V Flame signal amplifier M Burner motor Z Ignition transformer TSA Ignition safety time A´ Beginning of the startup sequence with burners using an «OH» tw Waiting time A Beginning of the startup sequence with burners using no «OH» t1 Prepurge time B Time of flame establishment t3 Preignition time C Running position t3n Long postignition time D Controlled shutdown by «R» t3n´ Short postignition time t4 Interval between flame signal and release of «BV2» Control signals delivered by the LOA... Required input signals Permissible input signals Legend

Siemens Building Technologies CC1N7118en HVAC Products 09.10.2002 Dimensions Dimensions in mm 5,562,5 41,5 62,5 7118m05/1002 xxxxxxxxxx Status indication, orange Indication of flame strength, green /g24266 83,5 67,5 /g242 7118m04/0300 12/g242/g24223 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. LOA... Remote lockout reset module ARK21A27 /g211 2002 Siemens Building Technologies Subject to change! 7118m03/0300 62,5 xxxxxxxxxx 36,5