Controlled gas burner for heating boiler - has additional airflow provided by regulated blower to maintain programmed flame temperature
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Electric safety monitoring system - has bistable holding relay whose pick=up winding is in acknowledgement circuit, and release winding in fault signalling circuit
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Boiler with horizontal boiler sections
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CONTROL DEVICE FOR INDIVIDUALLY CONNECTED AND DISCONNECTABLE ACTUATORS
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Threshold switching of control elements - using three point regulator for rapid correction and two point regulation for fine correction
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Flue gas manifold with separate offtakes - common draught diverter between manifold and chimney simplifies design
