AIR CONDITIONING SYSTEM — Amplifiers AC-41 2. System Operation When Input False Signal Condition: Setting Temperature is at 25°C (77°F) System Main Parts | False Signal | Motion Air Mix Control Servo Motor | A | Air mix control servo motor shaft moves towards max. hot side. | B | Air mix control servo motor shaft moves towards max. cool side. Air Vent Mode Control Servo Motor | A | VENT: Close | BI-LEVEL: Close | HEAT: Open | DEF: Close | B | VENT: Open | BI-LEVEL: Close | HEAT: Close | DEF: Close Blower Motor | A | Blower motor rotates at high speed. | B | Water Valve | A | OPEN | B | CLOSE FRE/REC Control Servo Motor | FRE Switch ON | Fresh air is ventilated. | REC Switch ON | Recirculation air is ventilated. If necessary, replace the system amplifier.