1. PRINCIPLE OF A/C ELECTRICAL CIRCUIT [Diagram showing electrical circuit with components: Ignition Switch (ACC), Circuit Breaker, HTR Fuse, Fuse, Battery, Heater Motor, Blower Motor, Blower Switch, A/C Fuse, A/C Switch, Dual Pressure Switch, A/C Amplifier, Magnetic Clutch Relay, Magnetic Clutch, Thermistor, TEMP] 2. HOW IS THE MAGNETIC CLUTCH ENERGIZED? The general process until the magnetic clutch is energized is shown below. ① Ignition Switch "ON" | ② Blower Switch "ON" ——→ Heater Relay "ON" (Blower Motor "RUN") | ③ A/C Switch "ON" ——→ A/C Amplifier "ON" (A/C Amp. Main Power Supply) | ④ Dual Pressure Switch "ON": Refrigerant Condition (2.1 kg/cm² (30 psi, 206 kPa) less than 27 kg/cm² (384 psi, 2,648 kPa)) | ⑤ Thermistor supplies temperature signal of evaporator to A/C amplifier. | ⑥ VSV "ON" ——→ E/G Idle-up | ⑦ Magnetic Clutch Relay "ON" | ⑧ Temperature Sensor "ON": Temperature of Temperature Sensor is less than 180°C (356°F). | ⑨ Magnetic Clutch "ON" | ⑩ Revolution Detecting Sensor supplies RPM signal of compressor to A/C amplifier. If compressor is not locked, magnetic clutch is continuously energized.