This device use the principle of additional DC power supply in main feeding switch, and use the principle of direction of zero sequence power in branch feeding switch.
该装置在总馈电开关处的漏电保护装置使用附加直流电源原理，在分支馈电开关处的漏电保护装置使用零序功率方向式保护原理。
Switch on the power supply, power on the compressor, and examine whether the rotation direction of the fans of the evaporator and condenser agrees on that of the arrowhead.
接通电源，点动启动压缩机，检查蒸发器及冷凝器风扇的旋转方向是否与箭头方向一致。
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