Multiple-unit air conditioning apparatus

摘要

To obtain a multiple-unit air conditioning apparatus capable of detecting, when improper wire connections are made, improper wiring and eliminating an improper wiring state without performing a re-wiring work. When an operation command for an indoor unit Y, received from indoor unit control means 15, does not match a refrigerant circuit of an indoor unit Y whose refrigerant circulation is controlled by outdoor unit control means 14, operation patterns are extracted on the basis of the number of operating indoor units Y. A refrigerant circuit in which a refrigerant is circulated is switched in accordance with the operation patterns. Each wire 18 connected to the indoor unit control means 15 of each indoor unit Y is associated with each refrigerant circuit controlled by the outdoor unit control means 14, and recognition of wire connections is changed.

主权项

1. A multiple-unit air conditioning apparatus comprising:
an outdoor unit; and a plurality of indoor units, wherein a compressor, indoor heat exchangers provided for the individual indoor units, expansion devices that are provided for the individual indoor heat exchangers and that change refrigerant flow rate, and an outdoor heat exchanger provided for the outdoor unit are connected by refrigerant pipes, and refrigerant circuits in which a refrigerant is circulated are formed for the individual indoor units, wherein each of the indoor units includes:
an indoor unit electronic controller configured to control operation of the indoor unit and transmit an operation command for the indoor unit and measurement information of the indoor unit, wherein the outdoor unit includes
an outdoor unit electronic controller connected by wires to the indoor unit electronic controller of the individual indoor units, and wherein the outdoor unit electronic controller is configured to:
(a) receive an operation command for each of the indoor units, transmitted by the indoor unit electronic controller of the indoor unit, recognize that the indoor unit corresponding to the wire that has received the operation command is operating, and perform control to circulate the refrigerant in a refrigerant circuit corresponding to the operating indoor unit,(b) determined whether data, written in a volatile memory, indicates that recognition of wire connections is previously performed,when the data in the volatile memory is determined to indicate that the recognition of the wire connections is previously performed, cancel performance of steps (c) to (h) and proceed to normal operation,when the data in the volatile memory is determined to indicate that the recognition of the wire connections is not previously performed, perform the following:(c)when the operation command for the indoor unit, received from the indoor unit electronic controller, does not match the refrigerant circuit of the indoor unit whose refrigerant circulation is controlled by the outdoor unit electronic controller,
(d) extract operation patterns of a refrigerant circuit in which the refrigerant is circulated and a refrigerant circuit in which no refrigerant is circulated, on the basis of a number of operating indoor units,(e) switch the refrigerant circuit in which the refrigerant is circulated, in accordance with the operation patterns,(f) associate each wire connected to the indoor unit electronic controller of each indoor unit and each refrigerant circuit controlled by the outdoor unit electronic controller, on the basis of the measurement information of the indoor unit, received from the indoor unit electronic controller, and an operation state of the indoor unit corresponding to the wire which has received the measurement information, and(g) change recognition of the wire connections so that the operation command for the indoor unit, received from the indoor unit electronic controller, matches the refrigerant circuit of the indoor unit whose refrigerant circulation is controlled by the outdoor unit electronic controller, and(h) write data in a volatile memory, the data which is written indicates that the recognition of the wire connections is previously performed.