380付空调必须五根线,三根火线一根零线一根接地线。三相空调是用三相电压即:380V电压的,三相电有三根火线,一根地线和一根零线。控制电路、内外风机、四通阀、电辅助加热管使用220V电源,压缩机使用380V,所以运用三相四线供电。一般用三相四线漏电保护器控制线路的接通与断开。
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