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Overview of burner control applications, certifications, and intended use by OEMs.
Key features include undervoltage detection, air pressure supervision, and remote reset.
Details on different models like LMG21.../LMG22... and LMG25... with their specific capacities.
Description of the plug-in base design, terminals, and cable entry options.
Details on the UV ancillary unit AGQ2...A27 and its use with LMG2... burner controls.
Covers prerequisites, undervoltage, intermittent operation, and polarity protection.
Details fault program sequence, lockout conditions, and reset procedures.
Examples for controlling actuators in two-stage or modulating burners.
Examples for controlling actuators in two-stage or modulating burners.
Procedure to diagnose faults using LED blink codes on the burner control.
Table listing blink codes and their corresponding fault causes.
Table correlating blink codes with flame establishment times.
Dimensional drawings and specifications for the plug-in base.
Dimensional drawings for the AGQ2...A27 ancillary unit.
Overview of burner control applications, certifications, and intended use by OEMs.
Key features include undervoltage detection, air pressure supervision, and remote reset.
Details on different models like LMG21.../LMG22... and LMG25... with their specific capacities.
Description of the plug-in base design, terminals, and cable entry options.
Details on the UV ancillary unit AGQ2...A27 and its use with LMG2... burner controls.
Covers prerequisites, undervoltage, intermittent operation, and polarity protection.
Details fault program sequence, lockout conditions, and reset procedures.
Examples for controlling actuators in two-stage or modulating burners.
Examples for controlling actuators in two-stage or modulating burners.
Procedure to diagnose faults using LED blink codes on the burner control.
Table listing blink codes and their corresponding fault causes.
Table correlating blink codes with flame establishment times.
Dimensional drawings and specifications for the plug-in base.
Dimensional drawings for the AGQ2...A27 ancillary unit.
The Siemens LMG2... series of burner controls are designed for the supervision of single- or two-stage forced draught gas or gas/oil burners. These controls are suitable for small to medium capacity burners, typically up to 350 kW, operating in an intermittent mode. They are certified to EN 230 and EN 298 standards and carry the CE mark, indicating compliance with directives for gas appliances and electromagnetic compatibility. This data sheet is intended for Original Equipment Manufacturers (OEMs) who integrate these burner controls into their products.
The LMG2... series burner controls manage the startup and supervision of burners. Flame supervision is achieved using either a detector electrode or a UV flame detector (QRA...) in conjunction with an ancillary unit (AGQ2...A27).
Key application-specific features include:
The LMG2... burner controls feature a plug-in design, similar to their predecessor, the LGB2... series. The housing is constructed from impact-proof, heat-resistant plastic. It accommodates a microcontroller with a PCB relay for load control, an electronic flame signal amplifier (for ionization), and a lockout reset button with integrated red fault indication lamp and green flame signal lamp.
The plug-in base (AGK11) is also made of impact-proof, heat-resistant plastic and is available with screw terminals. Cable entry options include from the front, laterally via cable gland holders (AGK65 or AGK66), or from below through two 16.2 mm diameter holes. The base features catches on the narrow sides that audibly click when the burner control is plugged in. To disengage, a screwdriver must be slightly tilted in the guiding slots, which then slightly lifts the burner control.
When a lockout occurs, the burner control can be immediately reset by depressing the lockout reset button for a minimum of 0.5 seconds and a maximum of 3 seconds.
After lockout, the red fault LED remains steady on. To diagnose the cause, press the lockout reset button for more than 3 seconds after a waiting time of more than 10 seconds. The red fault LED will then blink a specific code, which can be referenced in the error code table.
This function measures the flame establishment time with ionization supervision (not available with AGQ2...). In the running position, the green flame signal LED is steady on. To read the flame establishment time, press the lockout reset button for more than 3 seconds. The green flame signal LED will then blink a code, which can be referenced in the diagnostics table as multiples of 0.4 seconds. The flame establishment time is the period from when "BV1" opens until the flame signal is first detected. This time is stored for one startup sequence and re-ascertained at the next startup. During interrogation, the fault status outputs are deactivated, the burner shuts down, and restarts only after a reset.
General| Order Number | LMG22.130A27 |
|---|---|
| Output Type | Relay |
| Communication Protocol | Modbus RTU |
| Communication Interface | RS-485 |
| Protection Class | IP20 |
| Mounting Type | DIN Rail |
| Mounting Position | Any |
| Flame Detector | Not Applicable |
| Series | LMG |
| Supply Voltage | 24 V DC |
| Mains Frequency | 50/60 Hz |
| Fuse Rating | 2 A |
