不用蒸气时，低位水箱内 的热水从连接管到高位水箱储存。

When steam is not used, hot water in low position water tank is stored in high position water tank through the connecting pipe.

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辅机膨胀水箱低位报警 Aux。

Engine expansion tank low level alarm.

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辅机膨胀水箱低位报警 Aux。

Engine expansion tank low level alarm.

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