INDOOR AND OUTDOOR COMMUNICATION CONTROL DEVICE FOR AIR CONDITIONER AND COMMUNICATION CONTROL DEVICE FOR AIR CONDITIONER AND APPARATUS

PROBLEM TO BE SOLVED: To provide an indoor and outdoor communication control device for an air conditioner, and a communication control device for the air conditioner and an apparatus, capable of protecting a circuit when the power source voltage is wrongly connected to a communication circuit even if the use of heating components is discontinued, selecting without restriction a value of the resistance for limiting the circuit current, and using the current and voltage in the optimum communication circuit. SOLUTION: This indoor and outdoor communication control unit of the air conditioner performing the communication between an indoor unit and an outdoor unit, and provided with the resistance for limiting the loop current of the communication circuit, comprises an element mounted in parallel with the resistance for limiting the loop current of the communication circuit, having high resistance value by a certain ser voltage, and rapidly reducing its resistance value when the voltage becomes more than the set voltage, and a thermistor of positive characteristic connected to the resistance connected with the element, in series. COPYRIGHT: (C)2004,JPO