Siemens Burner Controllers LME7 Series
Siemens Burner Controllers LME7 Series are microprocessor-based burner control units designed for medium- to large-capacity industrial oil and gas burners. They support multistage and modulating burner operation, providing automatic startup sequencing, flame supervision, air pressure monitoring, and combustion control functions. Depending on the model, the series supports ionization probes, UV flame detectors, QRB photoresistive detectors, and QRC blue-flame detectors. Suitable for industrial boilers, forced draft burners, and industrial heating applications requiring reliable burner control and safety supervision.
Product Details
Siemens Burner Controllers LME7 Series
Siemens Burner Controllers LME7 Series
Siemens Burner Controllers LME7 Series are microprocessor-based burner control units designed for the automatic control and supervision of medium- to large-capacity industrial oil and gas burners.
The LME7 Series provides burner startup sequencing, flame monitoring, air pressure supervision, and safety-related control functions for multistage and modulating burners. It is suitable for forced draft burners and atmospheric gas burners operating in intermittent mode.
The series includes LME71, LME72, and LME73 burner control units. Depending on the model and configuration, the controllers support mechanical or pneumatic fuel-air ratio control, air damper actuators, and pulse-width-modulated (PWM) fan control.
The controllers incorporate operating status indication, fault diagnostics, and parameter adjustment capabilities to support reliable combustion system operation.
Key Features
- Microprocessor-based burner control with accurate startup sequencing
- Supports multistage and modulating burner operation
- Flame supervision using ionization probes and compatible flame detectors
- Air pressure monitoring with air pressure switch functional checks
- Integrated undervoltage detection
- Electrical remote lockout reset capability
- Three-color LED for operating and fault status indication
- Parameter adjustment using AZL2 or ACS410 software
- Interface for compatible PME7 program modules
- Three-digit 7-segment display on LME71 and LME73 models
Applications
Siemens LME7 burner controllers are suitable for a wide range of industrial combustion control applications, including:
- Industrial boiler systems
- Industrial oil burners
- Industrial gas burners
- Forced draft burner systems
- Industrial heating equipment
- Industrial furnaces and thermal processes
- Multistage and modulating burner systems
Product Selection Guidelines
When selecting an LME71, LME72, or LME73 burner control unit, consider the burner type, fuel, supply voltage, flame detector compatibility, load control requirements, actuator configuration, and PME7 program module.
Note: Available functions and compatibility vary by model and configuration. Always verify the exact product code, technical documentation, and program module before installation or replacement.
Technical Specifications
Siemens LME7 Series Technical Specifications
| Specification | Technical Data |
|---|---|
| Brand | Siemens |
| Product Series | LME7 Series |
| Models | LME71 / LME72 / LME73 |
| Product Type | Microprocessor-based Burner Control |
| Burner Application | Multistage / Modulating, Forced Draft, Atmospheric Gas Burners |
| Fuel Type | Oil / Gas, depending on configuration |
| Supply Voltage | 120 V AC or 230 V AC, depending on model |
| Supply Frequency | 50 / 60 Hz |
| Internal Power Consumption | Typically less than 10 W |
| External Primary Fuse | Max. 6.3 A, slow-blow |
| Flame Detection | Ionization Probe, QRA2 / QRA4 / QRA10, QRB1 / QRB3 / QRB4, QRC (model-dependent) |
| Air Pressure Supervision | Air Pressure Switch Monitoring |
| Analog Load Control Inputs | 0–10 V DC, 0/4–20 mA, 0–135 Ohm (on supported models) |
| Fan Control | PWM Control Output |
| Parameter Adjustment | AZL2 / ACS410 |
| Status Indication | 3-Color LED; 3 x 7-Segment Display (LME71 and LME73) |
| Flame Failure Response Time | Max. 1 second |
| Operating Temperature | -40 to +60 °C |
| Storage Temperature | -40 to +70 °C |
| Relative Humidity | Less than 95% RH |
| Degree of Protection | IP00 |
| Weight | Approx. 490 g |
| Installation Altitude | Max. 2,000 m above sea level |
| Designed Lifetime | 250,000 burner startup cycles (approx. 10 years under normal conditions) |
| Applicable Standards | DIN EN 298, DIN EN 1643, DIN EN 13611, DIN EN 60730-2-5 |
Note: Specifications are based on Siemens Data Sheet CC1N7105en. Functions vary by model and configuration. Verify the exact model and compatible program module before installation. The LME7 basic unit is rated IP00; adequate installation protection to IP40 must be provided by the burner or boiler manufacturer.
Dimensions
Documents & Downloads
Frequently Asked Questions
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