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【壁挂炉排气系统故障-壁挂炉燃气阀故障怎么处理】一、循环泵与自动排气阀的作用与工作原理：（仅为参考图，具体以实物为准，图片只为展示一个基本原理 ， 实物位置例如热水出水回水，自来水热水口请根据安装手册为准）贝雷塔壁挂炉温馨提示：
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