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[0]
Not used
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The boost function is switched off.
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[1]
Via DI
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The boost function is switched on and off via a digital channel (e.g. "Boiler water level MIN" for the feedwater pump).
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[2]
Via level
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The boost function is switched on and off via a level.
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[3]
Via DI or level
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The boost function is switched on and off either via a digital channel or via a level (if one of the two conditions has been fulfilled).