Carrier 42NQV025M Service Manual

Contents

– 26 –Item1. BasicoperationOperation flow and applicable data, etc.1. Operation controlDescriptionReceiving the user’s operation condition setup, the operation statuses of indoor/outdoor units arecontrolled.1) The operation conditions are selected by the remote controller as shown in the below.2) A signal is sent by ON button of the remote controller.3) The signal is received by a sensor of the indoor unit and processed by the indoor controllers asshown in the below.4) The indoor controller controls the indoor fan motor and louver motor.5) The indoor controller sends the operation command to the outdoor controller, and sends/receivesthe control status with a serial signal.6) The outdoor controller controls the operation as shown in the left, and also controls the compres-sor, outdoor fan motor and 4-way valve.Remote controllerIndoor unitControl contents of remote controller• ON/OFF (Air conditioner)• Operation select (COOL/HEAT/AUTO/DRY)• Temperature setup• Air direction• Swing• Air volume select (AUTO/LOW/LOW+/MED/MED+/HIGH)• ECO• ON timer setup• OFF timer setup• Hi-POWERIndoor unit control• Command signal generating function ofindoor unit operation• Calculation function (temperature calculation)• Activation compensation function of indoor fan• Cold draft preventive function• Timer function• Indoor heat exchanger release control• Indoor fan motor• Louver motorOutdoor unitOutdoor unit control• Frequency control of inverter output• Waveform composite function• Calculation function(Temperature calculation)• AD conversion function• Quick heating function• Delay function of compressor reactivation• Current release function• GTr over-current preventive function• Defrost operation function• Compressor• Outdoor fan motor• 4-way valveSignal receivingIndoor unit controlOperation commandSerial signal send/receiveSelection ofoperation conditionsON/OFFSerial signal send/receiveOutdoor unit controlInverter~• PRESETFILE NO. SVM-070099-2. Operation Description