On the first filling of the hot water heating system or refilling after maintenance, air in the piping and radiation must be removed and the whole system filled with water.
在对热水加热系统进行首次进水或维护后在进水，管道和散热器内的空气必须被排除出来，整个系统必须用水充满。
On the first filling of the hot water heating system or refilling after maintenance, air in the piping and radiation must be removed and the whole system filled with water.
在对热水加热系统进行首次进水或维护后在进水，管道和散热器内的空气必须被排除出来，整个系统必须用水充满。
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