Preventing simultaneous start of air conditioners during recovery from a power failure

A control apparatus of an air-conditioner comprising a refrigeration circuit having a compressor driven by AC power from an AC power source, a condenser, an expansion device, and an evaporator wherein said condensor, said expansion device and said evaporator are connected by suitable refrigerant conduits in a refrigerant flow relationship including:

• an operation switch selectively set to one of a start position and a stop position;
• an electric power supply circuit for rectifying and regulating AC power supplied from said AC power source into a DC power;
• a microprocessor, driven by said DC power supplied from said electric power supply circuit, for executing a main program after a reset signal is supplied;
• wherein said main program controls a supply of said AC power from said AC power source to said compressor in accordance with a difference between a room temperature and a set temperature while said operation switch is selectively positioned at said start position;
• a reset circuit for outputting said reset signal to said microprocessor after a voltage of said DC power becomes higher than a predetermined voltage;
• a time setting switch for setting a delay time, and
• a sub-program for delaying an execution of said main program for a period of said delay time after said reset signal is supplied from said reset circuit.