Fujitsu AOU12RL2 Antifreezing Control Cooling and Dry mode, Cooling Pressure Overrise Protection

Page 22

3.ANTIFREEZING CONTROL (Cooling and Dry mode)

The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger temperature sensor detects the temperature lower than Temperature .

Then, the anti-freezing control is released when it becomes higher than Temperature .

(Table 22 : Anti-freezing Protection Operation / Release Temperature)

	Outdoor temperature		Temperature	Temperature
	Over than 10°C (50°F)*1			7°C (44.6°F)
	or 12°C (53.6°F)	*2	4°C (39.2°F)

	Less than 10°C(50°F)	*1		13°C (55.4°F)

	or 12°C (53.6°F)	*2

*1. When the temperature rises.

*2. When the temperature drops.

4. COOLING PRESSURE OVERRISE PROTECTION

When the outdoor unit heat exchange sensor temperature rises to 67°C (152.6°F) or greater, the compressor and the outdoor fan motor are stopped and trouble display is performed.

5.HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )

On heating mode, the compressor frequency is controlled as following based on the detection value of the indoor heat exchanger temperature sensor.

[ Control System ]

Indoor heat exchange temperature rises

Compressor is stopped

63°C (145.4°F)

The compressor frequency is

decreased 25rps every 120seconds.

55°C (131°F)

The compressor frequency is

decreased 3rps every 60seconds.

53°C (127.4°F)

Stable zone

50°C (122°F)

It returns to the normal operation

Indoor heat exchange temperature drops

01-17

Image 22

Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation Heating Operation DRY OperationAuto Changeover Operation 01-03FAN Operation Indoor FAN ControlFan speed Cooling OperationMoisture Return Prevention Control Cooling mode& Dry mode Cool AIR Prevention Control Heating modeHeating Operation Outdoor FAN Control Outdoor Fan MotorVertical Louver Control Adjust the RIGHT-LEFT LouversLouver Control Function RangeOpeartion Frequency Range Limitation of Compressor Frequency by Outdoor TemperatureCompressor Control Opeartion Frequency Control AT Normal Start UPTimer Opeartion Control Program TimerCooling operation mode Sleep TimerHeating operation mode Auto Restart Prevent to Restart for 3 Minutes 3 Minutes STFOUR-WAY Valve Extension Select 24C 75FCompressor Preheating Powerful OperationForced Cooling Operation Test Operation Economy OperationCondition of the Defrost Operation Completion Defrost Operation ControlCondition of Starting the Defrost Operation Release ConditionNormal defrost Integrating defrost Defrost Flow Chart01-14 OFF Defrost Opeartion Control Defrost end 01-15Current Release Control Discharge GAS Temperature Overrise Prevension ControlVarious Protections 01-16High Temperature Release Control Heating Mode Antifreezing Control Cooling and Dry modeCooling Pressure Overrise Protection Trouble Shooting Troubleshooting Error DisplayCheck Point 4 Check Serial Signal Reverse Transfer Signal Trouble Shooting with Error CodeOutdoor unit Main PCB Indoor unit Controller PCB Indoor unit Fan motor Check Point Check external cause such as noise Indoor unit Controller PCBCheck Point Check Indoor unit electric components 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 2 Check Heat exchanger Outdoor unit Main PCB CompressorCheck Point 3 Check Compressor Check Point 3 Replace Main PCB Check Point 3 Check Outdoor unit fan motor Outdoor unit Main PCB Outdoor unit Fan motorCheck Point 4 Check Output Voltage of Main PCB Check Point 2 Check each thermistor Check Point 3 Check the solenoid coil and 4-way valveForecast of Cause Indoor Unit No Power Trouble Shooting with no Error CodeCheck Point 3 Check Electrical Components Outdoor Unit No Power 02-23 Check Point 2 Check Outdoor unit operation Check Point Check Indoor/ Outdoor installation conditionNo Cooling / No Heating Check Point 3 Check Site conditionAbnormal Noise Water LeakingCompressor Service Parts InformationReplace Compressor Inverter Compressor Blue Red Outdoor unit Electronic Expansion Valve EEVCheck Point 5 Check Opening and Closing Operation of Valve Indoor unit fan motor Outdoor unit fan motorPage Appending Data Cooling Room Temperature Correction Function SettingSetting the Filter Sign Heating Room Temperature CorrectionRemote controller signal code Setting the Auto RestartYes 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