Siemens LME1 Series Manual
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Siemens LME1 Series Manual

Gas burner controls
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Use, features
Use
Features
CC1N7101en
19.03.2024
Gas burner controls
Burner controls for the supervision of 1- or 2-stage gas burners or gas burners of
small to medium capacity, with or without fan in intermittent operation.
The LME and this Data Sheet are intended for use by OEMs which integrate the
burner controls in their products.
LME are used for the startup and supervision of 1- or 2-stage gas burners or gas
burners in intermittent operation. Flame supervision takes place via an ionization probe
or a QRA2 / QRA2(1) / QRA2(2) / QRA2.9 / QRA4.U / QRA10.C UV flame detector with
AGQ3.xA27 ancillary unit for forced draft gas burners, or, in the case of blue-burning
flames, with a QRC1 blue-flame detector. In terms of housing dimensions, the LME are
identical with the burner control LGB and LMG burner controls (refer to Type summary).
Applications in accordance with EN 676: Forced draft burner for gaseous fuels
Type-tested and approved in accordance with DIN EN 298
Undervoltage detection
Air pressure supervision with functional check of the air pressure switch during
startup and operation (depending on the respective type)
Electrical remote reset facility
Multicolor indication of fault status and operational status messages
Limitation of restarts
Accurate control sequence thanks to digital signal handling
Controlled intermittent operation after a maximum 24 hours of continuous operation
7
101
LME1...
LME2...
LME4...
Smart Infrastructure

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  • Page 1 Gas burner controls LME1… LME2… LME4… Burner controls for the supervision of 1- or 2-stage gas burners or gas burners of small to medium capacity, with or without fan in intermittent operation. The LME and this Data Sheet are intended for use by OEMs which integrate the burner controls in their products.
  • Page 2 Supplementary documentation Type of documentation Product type Documentation number Environmental Declaration E7101 *) Product Range Overview Q7101 *) On request only Warning notes To avoid injury to persons, damage to property or the environment, the following warning notes must be observed! Do not to open, interfere with or modify the unit! ...

  • Page 3: Installation Notes

    Installation notes  Always run the high ignition voltage cables separate from the unit and other cables while observing the greatest possible distance  Do not mix up live and neutral conductors  Install switches, fuses, earthing, etc., in compliance with local regulations ...
  • Page 4 Connection of OCI400 optical interface  Plug the OCI400 optical interface into the socket on the lockout reset button of the LME. Interface diagnostics works only if the AGK20 lockout reset button extension is not fitted  Without using an extension, connect the OCI400 optical interface to the interface of your PC according to the following example setup Electrical connection of flame detectors It is important to achieve practically disturbance- and loss-free signal transmission:...

  • Page 5: Commissioning Notes

    Commissioning notes When commissioning the plant for the first time or when doing maintenance work, make the following safety checks: Safety check to be carried out Anticipated response a) Burner startup with previously LME11/LME41.051: interrupted line to the flame detector Maximum of 3 restarts LME2/LME41.052/LME41.053/LME41.054/LME41.071/ LME41.09/LME44:...

  • Page 6: Standards And Certificates

    The electrical connections of the LME and the AGK11 plug-in base comply with the requirements of DIN EN 60730-2-5. EAC Conformity mark (Eurasian Conformity mark) UKCA conformity mark (UK) China RoHS Hazardous substances table: http://www.siemens.com/download?A6V10883536 6/40 Smart Infrastructure CC1N7101en 19.03.2024...
  • Page 7 Standards and certificates (cont’d) Product no. ● ● ● LME11.230C2 ● ● ● ● LME11.330C2 ● ● ● ● LME21.130C1 ● ● ● ● ● LME21.130C2 ● ● ● ● ● LME21.230C2 ● ● ● ● LME21.330C1 ● ● ● ●...

  • Page 8: Disposal Notes

    Lifetime The burner control has a designed lifetime* of 250,000 burner startup cycles which, under normal operating conditions in heating mode, correspond to approx. 10 years of usage (starting from the production date given on the type field). This lifetime is based on the endurance tests in the standard EN 298.
  • Page 9 Type summary The product nos. applies to the LME without plug-in base and without flame detector. For ordering information on plug-in bases and other accessories, see Accessories. Mains Flame detector Article no. Product no. approx. max. min. approx. approx. approx. min.
  • Page 10 Type summary (cont’d) The product nos. applies to the LME without plug-in base and without flame detector. For ordering information on plug-in bases and other accessories, see Accessories. Mains Article no. Flame detector Product no. approx. max. min. approx. approx. approx.
  • Page 11 Type summary (cont’d) The product nos. applies to the LME without plug-in base and without flame detector. For ordering information on plug-in bases and other accessories, see Accessories. t1´ Mains Flame detector Article no. Product no. max. approx. min. approx. approx.
  • Page 12 Refer to Data Sheet N7712. Frontal illumination Blue-flame detector QRC1 Refer to Data Sheet N7716. Lateral illumination Ionization probe Flame detector for use with Siemens burner controls for the supervision of gas flames. To be supplied by customer. 12/40 Smart Infrastructure CC1N7101en...

  • Page 13: Service Tools

    Accessories (to be ordered separately) (continued) Service tools Optical Interface OCI400 Article no.: BPZ:OCI400  Optical interface between burner control and PC  Facilitates viewing and recording of setting parameters on site using the ACS410 PC software Refer to Data Sheet N7614 PC Software ACS410 Article no.: BPZ:ACS410 PC software for parameterization and visualization of the...
  • Page 14 Accessories (to be ordered separately) (continued) Others Valve proving system LDU11 (only LME2) Designed to check the tightness of shutoff valves in connection with gas burners and gas devices. In the event of inadmissible leakage, the system prevents the burner from starting up.
  • Page 15 Technical data Mains voltage AC 120 V +10%/-15% General unit data AC 230 V +10%/-15% Mains frequency 50...60 Hz ±6% Power consumption 12 VA External primary fuse (Si) 6.3 A (slow) Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced.
  • Page 16 Technical data (cont'd) Storage EN 60721-3-1:1997 Environmental conditions Climatic conditions Class 1K3 Mechanical conditions Class 1M2 Temperature range -20...60 °C Humidity <95% r.h. Transport EN 60721-3-2:1997 Climatic conditions Class 2K2 Mechanical conditions Class 2M2 Temperature range -20...60 °C Humidity <95% r.h. Operation EN 60721-3-3:1995 + A2:1997 Climatic conditions...
  • Page 17 Technical data (cont'd) Flame supervision with ionization probe At mains voltage UN = AC 120 V ¹) UN = AC 230 V ¹) Detector voltage between ionization probe and ground AC 50...120 V AC 115...230 V (AC voltmeter Ri 10 M) Switching threshold (limit values): Switching on (flame ON) (DC ammeter Ri 5 k) DC 1.5 µA...
  • Page 18 Technical data (cont'd) Flame supervision Only in connection with LMExx.xxxx2 (AC 230 V)! with QRA2 / QRA2(1) / QRA2(2) / QRA2.9 / Notes QRA4.U / QRA10.C Lifetime of the UV cell. and AGQ3.xA27 UV cells and the QRA2 / QRA2(1) / QRA2(2) / QRA2.9 / QRA4.U / QRA10.C are subject to wear and tear and must be replaced as part of regular maintenance, at the ...
  • Page 19 Technical data (cont'd) Ancillary unit Use of the AGQ3.xA27 ancillary unit is mandatory in connection with LMExx.xxxx2 AGQ3.xA27 burner controls. A UV test with increased supply voltage is performed to check the through-ignition tendency of aging UV tubes. The UV test is performed in standby until the fan motor (terminal 3) is activated, refer to chapter ‘Program sequence’.
  • Page 20 Technical data (cont'd) Detector current required Perm. detector current Possible detector current Flame supervision (with flame) (without flame) with flame (typically) with QRC1 QRC1 Min. 40 µA Max. 5,5 µA Max. 60 µA (only LME23) The values given in the table above only apply under the following conditions: - Mains voltage AC 230 V - Ambient temperature 23 °C Green signal lamp...
  • Page 21 Functions (cont'd) If a non-alterable lockout occurs, the outputs for the fuel valves, the burner motor and Control sequence in the event of fault the ignition equipment are always immediately deactivated (<1 s). Cause Response Mains voltage failure Safety shutdown followed by restart on restoration of mains voltage Voltage below undervoltage threshold Safety shutdown...
  • Page 22 Functions (cont'd) After a non-alterable lockout, a reset can be carried out immediately. To do this, press Resetting the burner control the lockout reset button for about 1 second (<3 seconds). The LME can only be reset when all contacts in the line are closed and when there is no undervoltage. After a non- volatile lockout and reset, a restart with prepurging (t1) takes place.

  • Page 23: Operation, Indication, Diagnostics

    Operation, indication, diagnostics Lockout reset button is the key operating element for resetting the Operation burner control and for activating/deactivating the diagnostics functions. The multicolor signal lamp (LED) in the lockout reset button is the key Yellow indicating element for visual diagnostics and interface diagnostics. Green Both the lockout reset button and signal lamp (LED) are located under the transparent cover of the lockout reset button.
  • Page 24 Operation, indication, diagnostics (cont'd) Diagnostics of the After a non-volatile lockout, the signal lamp (LED) lights up red. In that condition, visual cause of fault diagnostics of the cause of fault according to the error code table can be activated by pressing the lockout reset button for more than 3 seconds.
  • Page 25 Operation, indication, diagnostics (cont'd) Error code table Signal lamp (LED) Alarm at Possible cause flashing code red term. 10 2 blinks No establishment of flame at the end of safety time (TSA) Faulty or soiled fuel valves Faulty or soiled flame detector Poor adjustment of burner, no fuel Faulty ignition equipment 3 x blinks...
  • Page 26 Inputs and outputs/internal connection diagram/control sequence of LME11 RESET K2/1 K2/2 R / W 7101a24e/0609 Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced. B´...
  • Page 27 Inputs and outputs/internal connection diagram/control sequence of LME21 RESET K2/1 K2/2 R / W 7101a22e/0609 Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced. B´...
  • Page 28 Application examples only LME11 / LME21 / LME22 Caution! The connection diagrams shown are merely examples which must be verified in the individual case depending on the application! Recommendation:  Note In environments with high electromagnetic interference, terminal 3 should be loaded with the AGK25 PTC resistor for burners without a fan motor or for fan control with an auxiliary contactor, otherwise the burner will not start reliably.
  • Page 29 Application examples Caution! The connection diagrams shown are merely examples which must be verified in the individual case depending on the application! Control of actuators of 2-stage or 2-stage 7101a09/0409 modulating burners. Controlled prepurging with low-fire air volume. Same low-fire actuator position during startup and operation.
  • Page 30 Inputs and outputs/internal connection diagram/control sequence of LME22 / LME23 RESET K2/1 K2/2 R / W Only LME23... 7101a02e/0609 Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced.

  • Page 31: Application Examples

    Application examples Caution! The connection diagrams shown are merely examples which must be verified in the individual case depending on the application! Control of actuators of 2-stage or 2-stage modulating burners. Controlled prepurging (t1) with high-fire air volume. For information about actuators: SQN3: Refer to Data Sheet N7808 SB/R/W SQN7: Refer to Data Sheet N7804...
  • Page 32 Application 1  LME21.xxxC / LME22.xxxC with LDU11 valve supervision system  Valve supervision before startup of burner  With plants without vent pipe to atmosphere Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced.
  • Page 33 Application 1 (cont’d)  Start valve proving each startup, with connection of terminal 3, after controller ON or after lockout  The valve proving after each lockout of the LDU11 can take up to 160 seconds. Therefore, the maximum permissible air pressure switch flame-out time is 180 seconds ...
  • Page 34 Application 2  LME21.xxxC / LME22.xxxC with LDU11 valve supervision system  Valve supervision before startup of burner  With plants with vent pipe to atmosphere Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced.
  • Page 35 Application 2 (cont’d)  Start valve proving each startup, with connection of terminal 3, after controller ON or after lockout  The valve proving after a lockout of the LDU11 can take up to 160 seconds. Therefore, the maximum permissible air pressure switch flame-out time is 180 seconds ...
  • Page 36 Inputs and outputs/internal connection diagram/control sequence of LME41 RESET K2/1 K2/2 R / W DBR1 (without LP) 7101a27e/0609 Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced.
  • Page 37 Inputs and outputs/internal connection diagram/control sequence of LME44 RESET K2/1 K2/2 R / W 7101a20e/0609 Caution! Risk of damage to the switching contacts! If the external primary fuse (Si) is blown due to overload or short-circuit at the terminals, the LME must be replaced. B´...
  • Page 38 Legend AGK25 PTC resistor Error message (alarm) Fuel valve Closed Position Indicator DBRx Wire link Pressure switch valve proving Lockout reset button (internal) Remote lockout reset button Flame signal Flame signal amplifier Gas pressure switch Main switch Auxiliary contactor, relay Ionization probe K1...4 Internal relays...
  • Page 39 Dimensions Dimensions in mm Plug-in base AGK11... 41.6 LME with extension of lockout reset button AGK20 Product no. Length (L) in mm AGK20.19 AGK20.43 AGK20.55 39/40 Smart Infrastructure CC1N7101en 19.03.2024...
  • Page 40 Dimensions (cont'd) Dimensions in mm Ancillary unit AGQ3.xA27 Product no. Dimensions AGQ3.1A27 AGQ3.2A27  2024 Siemens AG Smart Infrastructure, Berliner Ring 23, D-76437 Rastatt Subject to change! 40/40 Smart Infrastructure CC1N7101en 19.03.2024...

This manual is also suitable for:

Lme2 seriesLme4 seriesLmeLme11.230c2Lme11.330c2Lme21.130c1 ... Show all

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