(57) A multi air conditioning system and a method for inspecting pipe connection thereof,
in which the pipe connection is rapidly inspected and the reliability in inspecting
the pipe connection is improved. The method for inspecting the multi air conditioning
system, which includes a plurality of indoor units and a mode converter having a plurality
of heating valve-cooling valve sets for controlling refrigerant flowing into the indoor
units, includes: changing opened and closed states of one heating valve-cooling valve
set out of the plural heating valve-cooling valve sets during the operation of the
system; detecting the indoor unit having a heat exchanger, the temperature of which
varies corresponding to the change of the opened and closed states of the heating
valve-cooling valve set; and determining, when the indoor unit having the heat exchanger,
the temperature of which varies, matches with the heating valve-cooling valve set
having the changed opened and closed states thereof, that the connection between the
indoor unit having the heat exchanger, the temperature of which varies, and the heating
valve-cooling valve set, having the changed the opened and closed states thereof,
is normal.
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