然后我们关闭热水器的电力加热器的开关并将断路器打开。

Then open the “hot out” valve at the electric water heater and turn the breaker on.

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并采用固态继电器SSR作为加热器的开关元件。

Adopted solid state relay (SSR) as the heater's switching component.

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奋进号原订四月下旬发射，但是由于加热器中电路发生问题，被迫延期。工程人员更换了电路开关盒，并且安装了新线路。

Endeavour was set to launch in late April, but an electrical problem in a heater circuit forced a delay. Engineers replaced the switchbox and installed new wiring.

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