Fujitsu ASU12RL2, AOU12RL2 Defrost Operation Control, Condition of Starting the Defrost Operation

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18. DEFROST OPERATION CONTROL

1.CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts as shown in the following Table 18.

(Table 18 : Condition of starting Defrost Operation)

Normal defrost

	Compressor integrating operation time

Less than 25 minutes		More than 25 minutes

		Outdoor heat exchanger temp. < -17°C (1.4°F)
Does not operate		=
Does not operate		(at outside air temp. > -10°C (14°F))
		=
		Outdoor heat exchanger temp. < Outside air temp.
		=
		- 7°C (-44.6°F)
		or Outdoor heat exchanger temp. < - 20°C (-13°F)
		=	(14°F))
		(at outside air temp. < -10°C	(14°F))

Integrating defrost

Compressor integrating operation time

More than 240 minutes	More than 213 minutes	Less than 10 minutes
(For continuous operation)	(For continuous operation)	( For intermittent operation )
Outdoor heat exchanger	Outdoor heat exchanger	OFF count of the compressor
temperature below -3°C (-6°F)	temperature below -5°C (-10°F)	40 times

If the compressor continuous operation time is less than 10 minutes, the OFF number of the compressor is counted.

If any defrost operated, the compressor OFF count is cleared.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions become as shown in Table 19. (Table 19 : Defrost Release Condition)

Release Condition

Outdoor heat exchanger temperature sensor value is higher than +16°C (60.8°F) or

Compressor operation time has passed 15 minutes.

01-13

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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 OperationCool AIR Prevention Control Heating mode Moisture Return Prevention Control Cooling mode& Dry 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 TimerSleep Timer Cooling operation modeHeating 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 ConditionDefrost Flow Chart Normal defrost Integrating defrost01-14 OFF Defrost Opeartion Control Defrost end 01-15Current Release Control Discharge GAS Temperature Overrise Prevension ControlVarious Protections 01-16Antifreezing Control Cooling and Dry mode High Temperature Release Control Heating ModeCooling Pressure Overrise Protection Trouble Shooting Troubleshooting Error DisplayTrouble Shooting with Error Code Check Point 4 Check Serial Signal Reverse Transfer SignalOutdoor 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 Outdoor unit Main PCB Compressor Check Point 2 Check Heat exchangerCheck Point 3 Check Compressor Check Point 3 Replace Main PCB Outdoor unit Main PCB Outdoor unit Fan motor Check Point 3 Check 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 Trouble Shooting with no Error Code Indoor Unit No PowerCheck 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 LeakingService Parts Information CompressorReplace Compressor Inverter Compressor Outdoor unit Electronic Expansion Valve EEV Blue RedCheck 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 CorrectionSetting the Auto Restart Remote controller signal codeYes 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