Fujitsu AOU09RL2, ASU12RL2, AOU12RL2 manual Auto Changeover Operation, 01-03

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4. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum mode from among the Heating, Cooling, Dry and Monitoring modes.

During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 18°C (64°F) and 30°C (88°F) in 1°C (2°F) steps.

(Fig. 3 : Operation flow chart in Auto changeover)

	START
	Room temp.		YES
	>Ts+2°C (4°F) ?
	NO	TS : Setting temperature
NO	Room temp.
	<Ts- 2°C(4°F) ?
	YES
	HEATING OPERATION		COOLING OPERATION
YES	Thermostat remains		Thermostat remains	YES
	in OFF state for 6 minutes or		in OFF state for 6 minutes or
	longer?		longer?
	NO		NO
YES	System stops		System stops	YES
YES	or operation command other than		or operation command other than	YES
	auto changeover operation?		auto changeover operation?
	NO		NO

01-03

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Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation Heating Operation DRY OperationAuto Changeover Operation 01-03Indoor FAN Control Fan speedFAN Operation Cooling OperationHeating Operation Cool AIR Prevention Control Heating modeMoisture Return Prevention Control Cooling mode& Dry mode Outdoor FAN Control Outdoor Fan MotorAdjust the RIGHT-LEFT Louvers Louver ControlVertical Louver Control Function RangeLimitation of Compressor Frequency by Outdoor Temperature Compressor ControlOpeartion Frequency Range Opeartion Frequency Control AT Normal Start UPTimer Opeartion Control Program TimerHeating operation mode Sleep TimerCooling operation mode Prevent to Restart for 3 Minutes 3 Minutes ST FOUR-WAY Valve Extension SelectAuto Restart 24C 75FPowerful Operation Forced Cooling Operation Test OperationCompressor Preheating Economy OperationDefrost Operation Control Condition of Starting the Defrost OperationCondition of the Defrost Operation Completion Release Condition01-14 Defrost Flow ChartNormal defrost Integrating defrost OFF Defrost Opeartion Control Defrost end 01-15Discharge GAS Temperature Overrise Prevension Control Various ProtectionsCurrent Release Control 01-16Cooling Pressure Overrise Protection Antifreezing Control Cooling and Dry modeHigh Temperature Release Control Heating Mode Trouble Shooting Troubleshooting Error DisplayOutdoor unit Main PCB Trouble Shooting with Error CodeCheck Point 4 Check Serial Signal Reverse Transfer Signal Indoor unit Controller PCB Indoor unit Fan motor Indoor unit Controller PCB Check Point Check Indoor unit electric componentsCheck Point Check external cause such as noise Check Point 3 Replace Controller PCBIndoor unit Controller PCB Indicator PCB Manual auto switch Check Point 2 Replace Controller PCBIndoor unit Controller PCB Room temperature thermistor Indoor unit Controller PCB Heat Ex. temperature thermistor Check Point 2 Check ambient temp. around motor Check Point 3 Check Indoor unit fan motorCheck Point 2 Replace Main PCB Check Point 1-2 Check external causeCheck Point 2 Check connection of Connector Check Point 3 Replace Main PCB02-11 Outdoor unit Main PCB Discharge pipe temperature thermistor CN71 CN70Outdoor unit Main PCB Heat exchanger temperature thermistor Resistance Value k 606 759 213 8531Outdoor unit Main PCB Outdoor temperature thermistor Check Point 4 Replace Main PCB Check Point 3 Check Compressor Outdoor unit Main PCB CompressorCheck Point 2 Check Heat exchanger Check Point 3 Replace Main PCB Check Point 4 Check Output Voltage of Main PCB Outdoor unit Main PCB Outdoor unit Fan motorCheck Point 3 Check Outdoor unit fan motor Check Point 2 Check each thermistor Check Point 3 Check the solenoid coil and 4-way valveForecast of Cause Check Point 3 Check Electrical Components Trouble Shooting with no Error CodeIndoor Unit No Power Outdoor Unit No Power 02-23 Check Point Check Indoor/ Outdoor installation condition No Cooling / No HeatingCheck Point 2 Check Outdoor unit operation Check Point 3 Check Site conditionAbnormal Noise Water LeakingReplace Compressor Service Parts InformationCompressor Inverter Compressor Check Point 5 Check Opening and Closing Operation of Valve Outdoor unit Electronic Expansion Valve EEVBlue Red Indoor unit fan motor Outdoor unit fan motorPage Appending Data Function Setting Setting the Filter SignCooling Room Temperature Correction Heating Room Temperature CorrectionYes Setting the Auto RestartRemote controller signal code Procedures to change the Function Setting for wireless RC Selecting the Function Number and Setting Value Remote Controller Signal Code Setting Room temperature thermistor Discharge thermistorPage 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan