| 摘要 |
PROBLEM TO BE SOLVED: To detect temperature change in operation without receiving influence of room temperature to surely perform erroneous wiring check.SOLUTION: An outdoor unit and a plurality of indoor units B1-B4 are connected with piping and wiring. A multi-air conditioner includes: a control part 10 performing heating operation for checking erroneous wiring; a heat exchanger temperature sensor 12 detecting a temperature of a refrigerant of two phases of a gas and liquid in heating operation; and a liquid pipe temperature sensor 11 detecting the temperature of the refrigerant of a liquid phase, and expansion valves A1-A4 in each indoor unit are provided respectively. The control part 10 performs heating operation, the expansion valves A1-A4 are opened one by one, indoor units B1-B4 corresponding to the open expansion valves A1-A4 are determined on the basis of a temperature difference between a liquid pipe temperature in each indoor unit B1-B4 and a heat exchanger temperature, and all the expansion valves 4 and the indoor units B1-B4 correspond to each other. |
