Midea R410A Full DC Inverter Split Type Series Technical Manual MCAC-UTSM-201406
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6.4 Electric wire diagram
When connect the wire, pay attention to the phase sequence of the power supply. If the phase
sequence is reversed, the compressor will not start. Meanwhile, the fault indicator of the outdoor
electric control board will light up. After shifting the phase sequence, power on the unit until the
fault indicator goes out and the compressor starts up normally.
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