| 摘要 |
PROBLEM TO BE SOLVED: To suppress low water level cutoff of a boiler due to lowering of a water feed pump, in a boiler. SOLUTION: A water level in the boiler 1 and water feed capacity of a water feed pump 3 are monitored and when the water level reaches that at a given water feed starting timing, the water feed pump 3 is operated. When lowering of the water feed capacity is detected, the water feed starting timing is regulated according to lowering of the water feed capacity.
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