Control device for air conditioner

Claim 1

A control device for air conditioner comprising: a plurality of air conditioning units (20, 20, . . . ) which are formed of a plurality of groups (GR) and are designated as a single master unit (2a) and at least one slave unit (2b) operating in association with said master unit (2a) in said each group (GR); and a central control unit (30) which is connected to all the air conditioning units (20, 20, . . . ) and communicates various kinds of control signals including state signals representing states of said air conditioning units (20, 20, . . . ) with said each air conditioning unit (20, 20, . . . ), said central control unit (30) comprising: type memory means (M2) for receiving from said each air conditioning unit (20, 20, . . . ) type data for discriminating between the master unit (2a) and the slave unit (2b) to store the type data in every air conditioning unit (20, 20, . . . ); state changing means (3a) for responding to a process signal for identifying the group to which said each air conditioning unit (20) belongs to transmit, based on the type data of said type memory means (M2), a change signal for changing a state of said each air conditioning unit (20) to said air conditioning unit (20) as a master unit (2a) in the stop modes of all the air conditioning units (20, 20, . . . ); and group entry means (3b) for receiving a state signal from said each air conditioning units (20, 20, . . . ) to determine that said air conditioning units (20, 20, . . . ) having changed their states in response to the change signal form one of said groups (GR) and executing an entry of the determination result.