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Use
CC1N7435en
11.01.2007
Burner Controls
Burner controls for the supervision of 1- or 2-stage gas or gas / oil burners of
small to medium capacity (typically up to 350 kW), with or without fan, in intermit-
tent operation.
The LGB... and this Data Sheet are intended for use by OEMs which integrate the
burner controls in their products!
The LGB... burner controls are used for the startup and supervision of 1- or 2-stage gas
or gas / oil burners in intermittent operation.
Depending on the type of burner control used, the flame is supervised either by an
ionization probe, a blue-flame detector QRC1... for forced draft gas / oil burners, or a
Uv Detector Qra... (with auxiliary unit AGQ1...A27).
In connection with the respective adapters, the LGB... burner controls replace their
predecessor types LFI7... and LFM1... (also refer to «Replacement types» under «Or-
dering»).
Automatic forced draft burners for gaseous fuels to EN 676
-
Gas burner controls to EN 298
-
Undervoltage detection
-
Air pressure supervision with function check of the air pressure switch during
-
startup and operation
Electrical remote reset facility
-
LGB41... for use with atmospheric gas burners
-
7
LGB...
Building Technologies
HVAC Products
435
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Table of Contents
Related Manuals for Siemens LGB21.550A27
Summarization of Contents
Burner Controls
Use
Describes the application of LGB burner controls for startup and supervision of gas/oil burners.
Mechanical design
Type summary
Lists type references for LGB burner controls and their approvals.
Flame supervision
Flame supervision with ionization probe
Details how ionization probes are used for flame supervision.
Ionization current supervision with burner controls operating on AC 110 V
Discusses specific considerations for AC 110V operation.
Connection of transformer
Provides a diagram for connecting a transformer for ionization current.
Flame supervision with blue-flame detector QRC1...
Explains flame supervision using blue-flame detectors.
Flame supervision with UV detector QRA... and AGQ... for LGB21... / LGB22.../LGB41...
Details UV detector usage with specific LGB models.
UV detector QRA...
Describes the universal UV flame detector.
Auxiliary unit AGQ1...A27
Details the function and connection of the auxiliary unit.
Functions
Preconditions for burner startup
Lists essential conditions required before burner startup.
Undervoltages
Explains how the control detects and reacts to low voltages.
Reversed polarity protection
Describes the protection against incorrect polarity connection.
Startup sequence
Outlines the step-by-step process of burner startup.
Control sequence in the event of fault
Lockout
Explains what happens when the burner control enters a lockout state.
Resetting the LGB...
Details the procedure for resetting the burner control after a fault.
Lockout and control sequence indication
Describes how to interpret fault indications and sequence status.
Connection diagrams
LGB21...
Wiring diagrams for LGB21 series burner controls.
LGB22... / LGB32...
Wiring diagrams for LGB22 and LGB32 series burner controls.
LGB41...
Wiring diagrams for LGB41 series burner controls.
Internal diagram and time diagram of the programming mechanisms
LGB21...
Internal schematics and timing charts for LGB21 programming.
LGB22... / LGB32...
Internal schematics and timing charts for LGB22/LGB32 programming.
LGB41...
Internal schematics and timing charts for LGB41 programming.
Dimensions
LGB...
Physical dimensions of the LGB burner control unit.
Auxiliary unit AGQ1...A27
Physical dimensions of the AGQ1...A27 auxiliary unit.
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