在进行电路连接之前，请确认热水器是否已经注满水，冷水进口阀门是否处于开启状态。
Before any electrical connections are made, be sure that the heater is full of water and that the valve in the cold water supply line is open.
在装配和泵送操作过程中，可以检查所有电路连接和元件功能，并对全部功能进行检查确认。
All electrical connections and com - ponent functions can be checked and full functionality confirmed during assembly and pumpdown operations.
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