Sistema de acondicionamiento de aire con una pluralidad de líneas de comunicación entre la unidad interior y la unidad exterior y medios de conmutación

摘要

In an air conditioning system, an indoor unit has at least one of a first communication circuit for performing communications through two communication lines independent of power supply lines and a second communication circuit for performing communications through one of the power supply lines and one communication line independent of the power supply lines, and an outdoor unit has a third communication circuit that is connected to the indoor unit to communicate with one of the first communication circuit and the second communication circuit, and a switch for connecting one of communication terminals of the third communication circuit to one of the power supply lines when the third communication circuit is connected to the second communication circuit, and releasing the connection concerned when the third communication circuit is connected to the first communication circuit.