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The LBG21.350 features undervoltage detection and air pressure supervision with a functional check of the air pressure switch during startup and 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.xA27).
In the event that the mains voltage drops below about AC 165 V, an electronic circuit ensures that the gas burner control will prevent burner startup or – without releasing fuel – lockout will be initiated.
Applications in accordance with EN 676: Automatic forced draft burners for liquid fuels. The LGB21.350 A27 is designed for use with gas burners of small to medium capacity, with or without an auxiliary fan, in intermittent operation. The LGB21 is used for the supervision, startup and control of 1- or 2-stage gas burners. As well as for gas burners/oil burners of small to medium capacity (typically up to 350 kW), with or without a fan in intermittent operation.
Burner controls have a designed lifetime of 250,000 burner startup cycles which, under normal operating conditions in heating mode, correspond to approx. 10 years of usage
In terms of dimensions, the LGB21.350 A27 burner control boxes are identical to the LME, and LMG control boxes.
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