Control apparatus for an air conditioner

Claim 1

A control apparatus for an air conditioner comprising: a thermostat circuit including a temperature detection element and a comparator to issue an output upon detection of a reaching of measured temperature to a predetermined temperature, a timer circuit including a clock generator and a counter, and a logic circuit, said thermostat circuit excluding said temperature detection element, said timer circuit and said logic circuit being formed in a semiconductor IC, said logic circuit having a control terminal to receive a control input for switching logic gates therein thereby selecting connections of the logic circuit between a first connection for defrosting of an outdoor unit in a room heating operation wherein a detection of an output signal from said thermostat circuit is interrupted for a first specified time period, thereafter said counter begins counting of a second specified time period and a switch for reversing a flow direction of a refrigerant gas is actuated upon receipt of an earlier one of respective output signals from said thermostat circuit and said timer circuit, and a second connection for temperature controlling for a room cooling operation wherein said thermostat circuit controls the actuation of said compressor motor independently from the output of said timer circuit, a hysteresis voltage is given to said thermostat circuit at a stopping of said compressor motor and said timer circuit counts a third specified time period after stopping of said compressor motor.