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Air-conditioning apparatus including an indoor unit and an outdoor unit having its compressor driven by a three-phase AC power supply

  • US 5,062,278 A
  • Filed: 12/31/1990
  • Issued: 11/05/1991
  • Est. Priority Date: 02/23/1990
  • Status: Expired due to Fees
First Claim
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1. An air-conditioning apparatus, including an indoor unit and an outdoor unit having its compressor driven by a three-phase alternating-current power supply, comprising:

  • means, provided at at least one of the units, for preparing a serial signal corresponding to to-be-transmitted information in synchronism with a first line voltage of the three-phase alternating-current power supply and for transmitting the serial signal to the other unit;

    means, provided at at least one of the units, for receiving the serial signal sent from the corresponding unit and determining the contents of the serial signal;

    means for detecting one of a second and a third line voltages of the three-phase alternating-current power supply;

    means for detecting a difference between a phase angle of the detected line voltage and that of the serial signal;

    means for comparing the detected difference with set values;

    means for determining, in accordance with the result of comparison, whether the three-phase alternating-current power supply is in a positive-phase sequence or in a negative-phase sequence; and

    means for inhibiting an operation of the compressor when the negative-phase sequence is determined by the determining means.

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