Forced-air Furnaces: The What, Why, and How
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暖炉控制板给引风机送电后,还要等压力开关回报变化;温度越界时,另一个开关能终止运行。发出开机命令、证明气流出现、允许持续燃烧分别由不同条件决定。
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looks for the output from this pressure switch to change.it’s designed to protect against overheating.