Fujitsu AO*G18LFC series Service Instruction Download Page 22 | Manualshive

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4. COOLING PRESSURE OVERRISE PROTECTION

When the outdoor unit heat exchange sensor temperature rises to 67°C or greater,
the compressor is 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.

01-19

[ Control System ]

Indoor heat exchange
temperature

It returns to the normal operation

Compressor is stopped

53°C

55°C

63°C

50°C

The compressor frequency is
decreased 4rps every 120seconds.

The compressor frequency is
decreased 25rps every 120seconds.

Stable zone

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Summary of Contents for AO*G18LFC series

Page 1: ...SPLIT TYPE ROOM AIR CONDITIONER WALL MOUNTEDtype Models Indoor unit Outdoor unit AS G18LFCA AO G18LFC INVERTER SERVICE INSTRUCTION R410A ...

Page 2: ...T OPERATION CONTROL 01 01 01 02 01 02 01 03 01 04 01 06 01 07 01 08 01 09 01 12 01 12 01 12 01 13 01 13 01 13 01 14 01 14 01 15 01 17 22 VARIOUS PROTECTIONS 01 18 01 12 2 TROUBLE SHOOTING 2 1 ERROR DISPLAY 2 1 1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY 2 1 2 WIRED REMOTE CONTROLLER DISPLAY OPTION 2 2 TROUBLE SHOOTING WITH ERROR CODE 2 3 TROUBLE SHOOTING WITH NO ERROR CODE 02 01 02 01 02 02 ...

Page 3: ...1 DESCRIPTION OF EACH CONTROL OPERATION R410A WALL MOUNTED type INVERTER ...

Page 4: ... C C zone 19 C D zone Hi Me Lo Quiet A zone 113rps 113rps 95rps 58rps 58rps 58rps 66rps 66rps 66rps 45rps 45rps 45rps 54rps 54rps 54rps 30rps 30rps 30rps 34rps 34rps 34rps 24rps 24rps 24rps B zone C zone 18LFC D zone E zone F zone Table 1 Compressor Frequency Range When the compressor operates for 30 minutes continuously at over the maximum frequency the maximum frequency is changed from Maximum F...

Page 5: ...minutes after starting the operation After 60 minutes it is controlled based on the normal setting temperature 01 02 minimum frequency maximum frequency AO G18LFC 18rps 130rps 3 DRY OPERATION 3 1 INDOOR UNIT CONTROL The compressor rotation frequency shall change according to the temperature set temperature and room temperature variation which the room temperature sensor of the indoor unit body has...

Page 6: ...uto changeover operation NO NO Thermostat remains in OFF state for 6 minutes or longer System stops or operation command other than auto changeover operation YES YES 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 ...

Page 7: ... COOLING OPERATION Switch the airflow AUTO and the indoor fan motor will run according to a room temperature as shown in Figure 3 On the other hand if switched in HIGH QUIET the indoor motor will run at a constant airflow of COOL operation modes QUIET LOW MED HIGH as shown in Table 4 4 DRY OPERATION Refer to the Table 4 During the dry mode operation the fan speed setting can not be changed Fig 3 A...

Page 8: ...perature rises When the room temperature drops TR Room temperature Ts Setting temperature LOW mode MED mode MED mode 42 C 30 C 34 C Indoor heat exchanger temperature Indoor heat exchanger temperature Hi Me Lo Cool air prevention 39 C 37 C 37 C 32 C 28 C S Lo It depends on the function setting Indoor unit fan control for energy saving at cooling mode and the indoor fan motor will run as shown in Fi...

Page 9: ...higher speed as table 8 without relating to the compressor frequency 01 06 Y Z F G ZONE AO G18LFC 1050 920 870 720 530 870 530 300 250 200 300 530 250 200 300 1100 870 780 720 590 480 Refer to Fig 7 rpm Table 8 Outdoor fan speed after the defrost 1 Outdoor Fan Motor 2 Fan Speed AC Motor DC Motor AO G18LFC Following table shows the type of the outdoor fan motor The control method is different betwe...

Page 10: ...sting operation time the air flow will be horizontal However the Airflow Direction cannot be adjusted at beginning AUTO operation mode During Heating Cooling Dry modes Cooling mode Dry mode Fan mode Heating mode Fan mode 3 SWING OPERATION When the swing signal is received from the remote controller the vertical louver starts to swing Swinging Range 1 3 1 4 4 6 3 6 To select Vertical Airflow Swing ...

Page 11: ... 101rps 110rps Table 9 Compressor Operation Frequency Range 2 OPEARTION FREQUENCY CONTROL AT NORMAL START UP The compressor frequency soon after the start up is controlled as shown in the fig 8 Fig 8 Compressor Control at Start up Time Time Time Time Time Time Frequency Time Frequency Frequency Frequency Frequency Frequency Frequency Time Time Time Time Time Time Frequency Frequency Frequency Freq...

Page 12: ...peration mode Stop mode Set time of timer The program timer allows the OFF timer and ON timer to be used in combination one time Operation mode Operation will start from the timer setting either OFF timer or ON timer whichever is closest to the clock s current timer setting The order of operations is indicated by the arrow in the remote control unit s display SLEEP timer operation cannot be combin...

Page 13: ...ion In the cooling operation mode When the sleep timer is set the setting temperature is increased 1 C It increases the setting temperature another 1 C after 1 hour After that the setting temperature is not changed and the operation is stopped at the time of timer setting Ts 1 C 2 C Set 60min In the heating operation mode When the sleep timer is set the setting temperature is decreased 1 C It decr...

Page 14: ... TIMER This timer function can set operation times of the each day of the week All days can be set together the weekly timer can be used to repeat the timer setting for all of the days 3 TEMPERATURE SET BACK TIMER This timer function can change setting temperature of setting operation times of the each day of the week This can be together with other timer setting Normal tmp ON OFF Setting day Sett...

Page 15: ... stopped even if any operation is given At the time when the air conditioner is switched from the cooling mode to heating mode the compressor is stopped and the four way valve is switched in 3 minutes later after the compressor stopped 12 PREVENT TO RESTART FOR 3 MINUTES 3 MINUTES ST 13 FOUR WAY VALVE EXTENSION SELECT 01 12 Wireless remote controller Under the condition where the air conditioner r...

Page 16: ... starting operation The FORCED COOLING OPERATION will start as shown in Table13 Manual auto operation When the power was interrupted by a power failure etc during operation the operation contents at that time are memorized and when power is recovered operation is automatically started with the memorized operation contents When the power is interrupted and recovered during timer operation since the...

Page 17: ...1 14 17 COMPRESSOR PREHEATING Fig 9 Compressor Preheating ON 5 C 7 C OFF 19 ECONOMY OPERATION The ECONOMY operation functions by pressing ECONOMY button on the remote controller The ECONOMY operation is almost the same operation as below settings Mode Cooling Dry Heating Target temperature Setting temp 1 C Setting temp 1 C Table15 18 10 C HEAT OPERATION The 10 C HEAT operation functions by pressin...

Page 18: ...essor integrating operation time Compressor integrating operation time Less than 25 min More than 25min Does not operate Integrating defrost Constant monitoring More than 240 min For long continuous operation Less than 10min 1 For intermittent operation 3 C More than 213 min For long continuous operation 5 C OFF count of the compressor 40 times 1 If the compressor continuous operation time is less...

Page 19: ...mperature Over 16 C or Compressor ON time Maximum 15 minutes Defrost end Compressor integrating operation Over 25 min Normal defrost Integrating defrost Constant monitoring Defrost Indicator Operation lamp 7 sec ON 2 sec OFF Defrost start Compressor OFF count 40 times Less than 10min Compressor integrating operation Over 240 min Outdoor heat exchanger temperature Below 3 C Compressor integrating o...

Page 20: ...er Operation lamp 7 sec ON 2 sec OFF Outdoor heat exchanger temperature Over 16 C or Compressor ON time Over 15 minutes Defrost end 2 OFF DEFROST END CONDITION Release Condition Outdoor heat exchanger temperature sensor value is higher than 16 C or Compressor operation time has passed 15 minutes 01 17 In heating operation the outdoor heat exchanger temperature is less than 4 C compressor continuou...

Page 21: ... the designated frequency of the indoor unit at the time when the frequency becomes lower than the release value Table 19 Current Release Operation Value Release Value 01 18 Heating 7 0A 6 5A 9 0A 8 5A 10 5A 10 0A 12 0A 11 5A OT Control Release 17 C 12 C OT Outdoor Temperature 5 C AO G18LFC 4 5A 4 0A 6 0A 5 5A 8 5A 8 0A OT Control Release 46 C 40 C OT Outdoor Temperature AO G18LFC Cooling 3 ANTIFR...

Page 22: ...TING MODE On heating mode the compressor frequency is controlled as following based on the detection value of the indoor heat exchanger temperature sensor 01 19 Control System Indoor heat exchange temperature It returns to the normal operation Compressor is stopped 53 C 55 C 63 C 50 C The compressor frequency is decreased 4rps every 120seconds The compressor frequency is decreased 25rps every 120s...

Page 23: ...2 TROUBLE SHOOTING R410A WALL MOUNTED type INVERTER ...

Page 24: ... Indoor Heat Ex Thermistor Error Continuous 4 times 2 times Continuous 1 times 5 times Outdoor Unit Main PCB Error 2 times 6 times Continuous Continuous 4 times 7 times 6 times 1 times Continuous 7 times 3 times Continuous 7 times 4 times Continuous PFC Circuit Error Discharge Thermistor Error Heat Ex Liquid Outlet Thermistor Error Outdoor Thermistor Error 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17...

Page 25: ...orized error codes may be displayed for the indoor unit connected to the remote controller 1 Stop the air conditioner operation 2 Press the SET TEMPERATURE buttons simultaneously for 3 seconds or more to start the self diagnosis 4 Press the SET TEMPERATURE buttons simultaneously for 3 seconds or more or there is no key input for 60 seconds to stop the display 3 Press the SET TEMPERATURE button to ...

Page 26: ...or removed connection line of Indoor unit and Outdoor unit If there is an abnormal condition correct it by referring to Installation Manual or Data Technical Manual Check Point 3 Check the voltage of power supply Check the voltage of power supply Check if AC198V AC220V 10 264V AC240V 10 appears at Outdoor Unit Terminal L N Check Point 4 Check Serial Signal Reverse Transfer Signal Check Serial Sign...

Page 27: ...loose or removed connection line of Indoor unit and Outdoor unit If there is an abnormal condition correct it by referring to Installation Manual or Data Technical Manual Check Point 3 Check the voltage of power supply Check the voltage of power supply Check if AC198V AC220V 10 264V AC240V 10 appears at Outdoor Unit Terminal L N Check Point 4 Check Serial Signal Reverse Transfer Signal Check Seria...

Page 28: ...ect the followings Check the connection of terminal between remote control and Indoor unit and check if there is a disconnection of the cable Upon correcting the removed connector or mis wiring reset the power Check Voltage at CN6 terminal 1 3 Power supply to Remote Control If it is DC12V Remote Control is failure Controller PCB is normal Replace Remote Control If it is DC 0V Controller PCB is fai...

Page 29: ...c wave near the power cable Neon light bulb or any electronic equipment which causes harmonic wave Note EEPROM EEPROM Electronically Erasable and Programmable Read Only Memory is a non volatile memory which keeps memorized information even if power is turned off It can change the contents electronically To change the contents it uses higher voltage than normal and it can not change a partial conte...

Page 30: ...tive 60 or more seconds 1 Manual auto switch failure 2 Controller PCB and Indicator PCB failure Check Point 1 Check the Manual auto switch Check if Manual auto switch is kept pressed Check Point 2 Replace Controller PCB If Check Point 1 do not improve the symptom change Controller PCB and Indicator PCB Check ON OFF switching operation by using a meter If Manual Auto Switch is disabled on off switc...

Page 31: ...hen Room Temperature Thermistor open or short circuit is detected 1 Connector connection failure 2 Thermistor failure 3 Controller PCB failure Check if connector is removed Check erroneous connection Check if thermistor cable is open Upon correcting the removed connector or mis wiring reset the power Thermistor Characteristics Approx value If Thermistor is either open or shorted replace it and res...

Page 32: ...Connector Check if connector is removed Check erroneous connection Check if thermistor cable is open Upon correcting the removed connector or mis wiring reset the power Check Point 2 Remove connector and check Thermistor resistance value Thermistor Characteristics Approx value If Thermistor is either open or shorted replace it and reset the power Check Point 3 Check voltage of Controller PCB DC5 0...

Page 33: ...fan is caught dropped off or locked motor If Fan or Bearing is abnormal replace it Check excessively high temperature around the motor If there is any surrounding equipment that causes heat Upon the temperature coming down restart operation When the condition that actual frequency of Indoor Fan is below 1 3 of target frequency is continued more than 56 seconds 02 10 Check Point 4 Replace Controlle...

Page 34: ...n PCB failure Check Point 1 1 Reset Power Supply and operate Does Error indication show again Check Point 1 2 Check external cause Check if temporary voltage drop was not generated Check if momentary open was not generated Check if ground is connection correctly or there are no related cables near the power line Change Main PCB Access to EEPROM failed due to some cause after outdoor unit started 0...

Page 35: ... symptom change Main PCB Check Point 1 Check external cause at Indoor and Outdoor Voltage drop or Noise Instant drop Check if there is a large load electric apparatus in the same circuit Momentary power failure Check if there is a defective contact or leak current in the power supply circuit Noise Check if there is any equipment causing harmonic wave near electric line Neon bulb or electric equipm...

Page 36: ...onnector or mis wiring reset the power Check Point 2 Check Outdoor Fan Heat Exchanger Is there anything obstructing the air distribution circuit Is there any clogging of Outdoor Heat Exchanger Is the Fan rotating by hand when operation is off If the Fan Motor is locked replace it Check Outdoor Fan Motor Refer to Trouble shooting 17 If the Fan Motor is failure replace it Check Point 4 Check Compres...

Page 37: ...Check if connector is removed Check erroneous connection Check if thermistor cable is open Upon correcting the removed connector or mis wiring reset the power Check Point 2 Remove connector and check Thermistor resistance value Thermistor Characteristics Approx value If Thermistor is either open or shorted replace it and reset the power Check Point 3 Check voltage of Main PCB DC5 0V Make sure circ...

Page 38: ...connector is removed Check erroneous connection Check if thermistor cable is open Upon correcting the removed connector or mis wiring reset the power Check Point 2 Remove connector and check Thermistor resistance value Thermistor Characteristics Approx value If Thermistor is either open or shorted replace it and reset the power 02 15 5 C 10 C 95 6 30 C 50 3 20 C 80 C 70 C 60 C 30 C 20 C 10 C 5 C 0...

Page 39: ...roneous connection Check if thermistor cable is open Upon correcting the removed connector or mis wiring reset the power Check Point 2 Remove connector and check Thermistor resistance value Thermistor Characteristics Approx value If Thermistor is either open or shorted replace it and reset the power 02 16 15 C 20 C 224 3 30 C 159 7 25 C 35 C 5 2 40 C 4 2 45 C 3 5 50 C 2 8 55 C 30 C 25 C 10 C 5 C 0...

Page 40: ...ternal cause 3 Main PCB failure Instant drop Check if there is a large load electric apparatus in the same circuit Momentary power failure Check if there is a defective contact or leak current in the power supply circuit Noise Check if there is any equipment causing harmonic wave near electric line Neon bulb or electric equipment that may cause harmonic wave Check the complete insulation of ground...

Page 41: ...excessive rise of ambient temperature 2 Inverter PCB failure 3 Inverter compressor failure lock winding short Protection stop by overcurrent generation after inverter compressor start processing completed generated consecutively 10 times The number of generations is reset if the start up of the compressor succeeds No obstructions in air passages Heat exchange fins clogged Outdoor unit fan motor ch...

Page 42: ...orrecting the removed connector or mis wiring reset the power Refer to PARTS INFORMATION 2 For Compressor Terminal Main PCB If the detected rotor location is out of phase with actual rotor location more than 105 at start up and 120 in operation the compressor stops After the compressor restarts if the same operation is repeated within 40sec the compressor stops again If and repeats 5 times the com...

Page 43: ...4 Check Output Voltage of Main PCB Check outdoor unit circuit diagram and the voltage Measure at Main PCB side connector If the voltage is not correct replace Main PCB When outdoor fan rotation speed is less than 100rpm in 20 seconds after fan motor starts fan motor stops After fan motor restarts if the same operation within 60sec is repeated 3 times in a row compressor and fan motor stops If and ...

Page 44: ... the solenoid coil and 4 way valve Remove CN30 from PCB and check the resistance value of coil Resistance value is 1 22k 1 49k at 20 C If it is Open or abnormal resistance value replace Solenoid Coil 02 21 Cooling or Dry operation Indoor heat exchanger temp Room temp 20degC Heating operation Indoor heat exchanger temp room temp 20degC If the same operation is repeated 5 times the compressor stops ...

Page 45: ...r unit fan heat exchanger Check for foreign object at heat exchanger Check if fan can be rotated by hand Motor check PARTS INFORMATION 5 Check Point 2 Check the EEV strainer Check Point 5 Check the refrigerant amount Leak check EEV EEV1 EEV2 open Strainer clogging check before and after EEV ACM oil return Check Point 2 Check the EEV strainer If the 3 way valve gas side was closed open the 3 way va...

Page 46: ...fective contact or leak current in the power supply circuit Noise Check if there is any equipment causing harmonic wave near electric line Neon bulb or electric equipment that may cause harmonic wave Check the complete insulation of grounding 02 23 2 3 TROUBLE SHOOTING WITH NO ERROR CODE Check Point 3 Check Electrical Components YES YES Check the voltage of power supply Check if AC198 264V appears...

Page 47: ...mentary power failure Check if there is a defective contact or leak current in the power supply circuit Noise Check if there is any equipment causing harmonic wave near electric line Neon bulb or electric equipment that may cause harmonic wave Check the complete insulation of grounding Check the voltage of power supply Check if AC198 264V appears at Outdoor Unit Terminal L N Check Fuse in Main PCB...

Page 48: ...s there loose or removed communication line of Indoor Unit and Outdoor Unit Instant drop Check if there is a large load electric apparatus in the same circuit Momentary power failure Check if there is a defective contact or leak current in the power supply circuit Noise Check if there is any equipment causing harmonic wave near electric line Neon bulb or electric equipment that may cause harmonic ...

Page 49: ...ts that obstruct the air flow route Check clogged Heat Exchanger Is the Valve open Is capacity of Indoor Unit fitted to Room size Any windows open Or direct sunlight Check connection pipe specified pipe length Pipe diameter Check any loose or removed communication line If there is an abnormal condition correct it by referring to Installation Manual or Data Technical Manual Check if Strainer is clo...

Page 50: ...on grille and front panel normal Is Fan broken or deformed Is the screw of Fan loose Is there any object which obstruct the Fan rotation Is Main Unit installed in stable condition Is Fan Guard installed normally Check if vibration noise by loose bolt or contact noise of piping is happening Is Compressor locked Check Compressor PARTS INFORMATION 1 2 Water Leaking 1 Erroneous installation 2 Drain ho...

Page 51: ...mpressor due to clogged dirt or less oil Replace Compressor Replace Compressor Replace Compressor Stops soon after starting up Is there open or loose connection cable Is Gas Pipe Valve open Low Pressure is too low Check if Refrigerant is leaking Recharge Refrigerant Check if Strainer is clogged PARTS INFORMATION 3 If there is no failure the defect of Compressor can be considered Compression part b...

Page 52: ...verter Compressor Check terminal connection of Compressor loose or incorrect wiring Check winding resistance of each terminal If the resistance value is 0 or infinite replace Compressor If the symptom does not change with above Check 1 2 replace Main PCB 02 29 R S W WHITE C T BLACK Terminal cover opened RED Resistance Value 0 477 at 25 C ...

Page 53: ...1 2 3 4 5 at 20 C Outdoor unit Electronic Expansion Valve EEV Check connection of connector CN40 Loose connector or open cable Remove connector check each winding resistance of Coil If Resistance value is abnormal replace EEV Remove Connector and check Voltage DC12V If it does not appear replace Main PCB Turn on Power and check operation noise If an abnormal noise does not show replace Main PCB Wh...

Page 54: ...oltage Vm No function No function Earth terminal GND Control voltage Vcc Speed command Vsp Feed back FG SERVICE PARTS INFORMATION 4 Check Point 1 Check rotation of Fan Indoor unit fan motor Rotate the fan by hand when operation is off Check if fan is caught dropped off or locked motor If Fan or Bearing is abnormal replace it Check Point 2 Check resistance of Indoor Fan Motor Refer to below Circuit...

Page 55: ...3 APPENDING DATA R410A WALL MOUNTED type INVERTER ...

Page 56: ...ect the time setting for the filter sign display interval in the table below according to the amount of dust or debris in the room If you do not wish the filter sign to be displayed select the setting value for No indication Factory setting Setting Description Function Number Setting Value Standard Slightly lower control Lower control Warmer control 30 00 01 02 03 1 2 Setting the Cooler Room Tempe...

Page 57: ...ption Function Number Setting Value Operation Stop mode Setting forbidden Forced stop mode 46 00 01 02 1 7 Setting the External input control Operation Stop mode or Forced stop mode can be elected Factory setting Setting Description Function Number Setting Value No Yes 49 00 01 1 8 Indoor unit fan control for energy saving Only cooling mode Enable or disable indoor unit fan control when the outdoo...

Page 58: ...etting Value Press the FAN button again to return to the Function Number selection Selecting the Function Number and Setting Value 6 Press the START STOP button It makes a signal to indoor unit Indoor unit run the setting 7 Press the RESET button to cancel the function setting mode 8 After completing the FUNCTION SETTING be sure to turn of the power and turn it on again CAUTION After turning off t...

Page 59: ...e setting of Fanction Number and Setting Value after setting custom code in remote controller please set custom code in remote controller again The remote control unit resets to signal code A when the batteries in the remote control unit are replaced If you use a signal code other than signal code A reset the signal code after replacing the batteries If you do not know the air conditioner signal c...

Page 60: ... continuously for 30 minutes After 60 minutes of operation Test mode is released automatically 1 Indoor Outdoor Temperature Outdoor Low Pressure Curve AS G18LFCA 2 Indoor Outdoor Temperature Outdoor Total Electric Current Curve AS G18LFCA Measure the low pressure with the pressure meter at the service valve Measure the outdoor unit overall current with the current clamp meter at Power Cable 03 05 ...

Page 61: ... mode and press TEST button of remote control 2 Operate continuously for 30 minutes After 60 minutes of operation Test mode is released automatically 1 Indoor Outdoor Temperature Outdoor High Pressure Curve AS G18LFCA 2 Indoor Outdoor Temperature Outdoor Total Electric Current Curve outdoor unit overall current with the current clamp meter at Power Cable length 03 06 2 1 2 3 2 5 2 7 2 9 3 1 0 2 4 ...

Page 62: ... 0 28 0 0 168 6 0 36 5 0 129 8 0 46 10 0 100 9 0 57 15 0 79 1 0 71 20 0 62 5 0 86 25 0 49 8 1 03 30 0 40 0 1 23 35 0 32 4 1 43 40 0 26 3 1 65 45 0 21 6 1 88 50 0 17 8 2 11 55 0 14 8 2 34 60 0 12 3 2 57 65 0 10 3 2 79 70 0 8 7 3 00 75 0 7 4 3 19 80 0 6 3 3 37 85 0 5 4 3 54 90 0 4 6 3 69 95 0 4 0 3 83 100 0 3 4 3 96 105 0 3 0 4 07 110 0 2 6 4 17 115 0 2 3 4 26 120 0 2 0 4 33 Temp C Temp C Temp C Res...

Page 63: ...1116 Suenaga Takatsu ku Kawasaki 213 8502 Japan Sep 2011 Printed in Japan ...

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