在把膨胀罐安装在系统里之前，膨胀罐必须预先充气加压使之达到步骤2所测定的系统压力。
Prior to installation of the tank in the system the tank must be pre-charged to the system pressure as determined in Step 2.
在把膨胀罐安装在系统里之前，膨胀罐必须预先充气加压使之达到步骤2所测定的系统压力。
Prior to installation of the tank in the system the tank must be pre-charged to the system pressure as determined in Step 2.
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