Schematic diagram of receiving control principle

The schematic diagram of the receiving principle of the KFR-24Gw(J) indoor unit is shown in Figure 18-10. As can be seen from the picture, the core of the electronic control part is
a microcomputer main control chip produced in South Korea, model THBT-R01. It has 42 pins and adopts dual in-line packaging.
    The receiver has a man-machine dialogue function. When a remote control or manual command signal is input, the buzzer drive circuit can send out a pre-recorded sound
signal to inform the working condition of the air conditioner . At the same time, the microcontroller can also use different light-emitting diodes to emit light. Displays the operating status of the air conditioner. The function of the microcontroller is to analyze and judge the input signal
    based on the internally programmed software fixed program , and then output the control signal to the actuator. Make the air conditioner operate in different modes. The internal program of the microcontroller is also programmed with five operation setting modes of the air conditioner : ① automatic operation; ② cooling; ③ dehumidification; ④ ventilation; ⑤ heating.     The microcontroller has 6 control functions: ① air door switch and control function ; @ timing function; ③ sleep mode function; ④ automatic defrost function ; ⑤ over and under voltage alarm function; ⑥ 3min delay protection function (to protect the compressor).