Fujitsu AB F18LAT Series Service Instruction Download Page 5

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1-1. COOLING OPERATION

1-1-1 COOLING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive

difference or variation between a set temperature and present room temperature, and

controls the operation frequency of the compressor.

The maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode

and the outdoor temperature.

* If the room temperature is 2 degC higher than a set temperature,

the compressor operation frequency will attain to maximum frequency.

* If the room temperature is 2.5 degC lower than a set temperature, the compressor will be stopped.

* When the room temperature is b2 degC to -2.5 degC of the setting temperature,

the compressor frequency is controlled within the range shown in Table1.

minimum

frequency

maximum

frequency

AB*F18, 24

AR*F18, 24

AU*F18, 24

18Hz

113Hz

18Hz

113Hz

AR*A24LATU

AU*A24LBL

Outdoor air

temperature

A zone

B zone

C zone

D zone

E zone

F zone

Quiet

A zone

113Hz

85Hz

54Hz

75Hz

54Hz

45Hz

38Hz

34Hz

27Hz

113Hz

80Hz

54Hz

66Hz

54Hz

45Hz

38Hz

34Hz

24Hz

B zone

C zone

AB*F18, 24

AR*F18, 24

AU*F18, 24

D-F zone

A zone

B zone

C zone

AR*A24LATU

AU*A24LBL

D-F zone

( Table 1 : Compressor Frequency Range )

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )

01-01

Fan speed mode

When the room

temperature rises

When the room

temperature drops

36°C

32°C

21°C

12°C

2°C

34°C

30°C

19°C

10°C

0°C

Summary of Contents for AB F18LAT Series

Page 1: ...t type Cassette type Models Indoor unit Outdoor unit AB F18LAT AB F18LBT AB F24LAT AB F24LBT AO A18LALL AO B18LALL AO A24LALL AO B24LALL INVERTER SERVICE INSTRUCTION R410A AR F18LALU AR F18LBLU AR A24LATU AR F24LBTU AU F18LAL AU F18LBL AU A24LBL AU F24LBL ...

Page 2: ... Wireless RC 01 18 COMPRESSOR PREHEATING 01 20 EXTERNAL ELECTRICAL HEATER CONTROL 01 19 FRESH AIR CONTROL 01 19 ECONOMY OPERATION 01 23 VARIOUS PROTECTIONS 01 24 FORCED COOLING OPERATION 01 25 COMPRESSOR STOP CONTROL 01 25 DEFROST OPERATION CONTROL 01 20 OFF DEFROST OPERATION CONTROL 01 22 LOUVER CONTROL 01 12 1 1 1 2 1 3 1 4 1 5 1 6 1 8 1 7 1 13 1 9 1 10 1 11 1 12 1 14 1 15 1 16 1 17 1 18 1 19 1 ...

Page 3: ...1 03 01 03 03 03 04 FUNCTION SETTING 03 05 EXTERNAL INPUT OUTPUT INDOOR UNIT 03 06 Procedures to change the Function Setting WIRED REMOTE CONTROLLER 3 1 3 1 1 3 1 2 3 1 3 3 1 4 Switching Remote Control Unit Signal Codes 3 2 ...

Page 4: ...R410A FLOOR CEILING DUCT CASSETTE type INVERTER 1 DESCRIPTION OF EACH CONTROL OPERATION ...

Page 5: ...temperature is between 2 degC to 2 5 degC of the setting temperature the compressor frequency is controlled within the range shown in Table1 minimum frequency maximum frequency AB F18 24 AR F18 24 AU F18 24 18Hz 113Hz 18Hz 113Hz AR A24LATU AU A24LBL Outdoor air temperature A zone B zone C zone D zone E zone F zone Hi Me Lo Quiet A zone 113Hz 113Hz 85Hz 54Hz 75Hz 75Hz 54Hz 54Hz 54Hz 45Hz 45Hz 38Hz ...

Page 6: ...essor will be stopped When the room temperature is between 2 5 degC to 3 degC of the setting temperature the compressor frequency is controlled within the range shown in Table2 Table 2 Compressor Frequency Range Fig 2 Limit of Maximum Frequency based on Outdoor Temperature 01 02 Outdoor air temperature A zone B zone C zone When the room temperature rises When the room temperature drops 17 C 12 C 1...

Page 7: ...ected as shown in the Fig 3 Room temperature Room temperature Compressor ON Ts 1 5 degC Ts 0 5 degC Compressor OFF Table 3 Compressor frequency Fig 3 Compressor Control based on Room Temperature 01 03 Operating frequency Ts Setting temperature AB F18 24 AR F18 24 AU F18 24 34Hz Compressor ON OFF Indoor fan Dry air flow S Lo OFF Fig 4 Indoor Fan Control 10 30 60 180 60 180 60 10 30 SEC AR A24LATU A...

Page 8: ...ted at the air conditioner operates as follow The same operation as COOLING OPERATION of item 5 1 above is performed However the setting temperature is raised 1degC and the room temperature correct coefficient value is 0 C When the compressor frequency have been below 20Hz for 8 minutes or the room temperature reaches setting temperature 1 5 C operation is automatically switched to DRY OPERATION o...

Page 9: ... Fan Heating AB F18LAT AB F18LBT Me 950 Operation mode Air flow mode Speed rpm Hi 730 630 540 460 Me Lo Dry Monitoring Quiet Hi Me Lo Quiet 830 770 630 500 460 300 Auto S Lo Cooling Fan Heating AU F18LAL AU F18LBL Me 730 Operation mode Air flow mode Speed rpm Hi 830 700 600 550 Me Lo Dry Monitoring Quiet 550 350 Auto S Lo Cooling Heating Fan AR A24LATU AR F24LBTU Operation mode Air flow mode Speed...

Page 10: ...hen the room temperature rises When the room temperature drops TR Room temperature Ts Setting temperature LOW mode MED mode HIGH mode Switch the airflow AUTO and the indoor fan motor will run according to a room temperature as shown in Figure 6 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 5 ...

Page 11: ...exchanger temperature Fan mode HIGH Fan mode MED LOW QUIET 5 2 For Duct type Cool air prevention 500rpm S Lo 300rpm 39 C 32 C Indoor heat exchanger temperature Indoor heat exchanger temperature S Lo Lo Qu Cool air prevention 37 C 30 C 34 C 24 C Setting FAN 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 24 C S...

Page 12: ...g the defrost control function on heating mode except economy operation its speed becomes 1020 950rpm 18L and 1100 1050rpm 24L regardless of the compressor frequency However it returns to the normal speed control when the defrosting operation does not function for 240 minutes after releasing the defrost operation or when the outdoor temperature sensor detection value becomes higher than 5 C Over t...

Page 13: ...e swing signal is received from the remote controller the vertical louver starts to swing The range of swing depends on the set airflow direction When the indoor fan is either at S Lo or Stop mode the swinging operation is interrupted and the louver stops at the memorized position Stop mode means Operation stop During Cooling Dry mode During Heating mode Fan mode During AUTO mode operation for the...

Page 14: ...The range of swing depends on the set airflow direction When the indoor fan is either at S Lo or Stop mode the swinging operation is interrupted and the louver stops at the memorized position Stop mode means Operation stop The type of operation Cooling Dry Range of swing to Heating to 5 FAN to 5 RIGHT LEFT air direction louvers Use the air direction adjustments within the ranges shown above The re...

Page 15: ...ON When the swing signal is received from the remote controller the vertical louver starts to swing The range of swing depends on the set airflow direction When the indoor fan is either at S Lo or Stop mode the swinging operation is interrupted and the louver stops at the memorized position 1 2 3 4 Stop mode means Operation stop During Cooling Dry mode Fan mode During Heating mode During AUTO mode...

Page 16: ...ng Min Max Min Max Dry Table 8 Compressor Operation Frequency Range 2 OPERATION FREQUENCY CONTROL AT START UP The compressor frequency soon after the start up is controlled as shown in Figure 9 Fig 9 Compressor Control at Start up 40Hz 90sec 180sec 270sec 59Hz 01 12 AO A18LALL AO B18LALL 18Hz 113Hz 18Hz 120Hz 34Hz AO A24LALL AO B24LALL 18Hz 113Hz 18Hz 120Hz 34Hz 85Hz ...

Page 17: ...ay Use this timer function to set operating time for each day of the week Operation mode The operating time can be set in 30 min increments only The OFF time can be carried over to next day The ON timer and the OFF timer functions cannot be set with using the weekly timer Both ON and OFF time must be set 2 WEEKLY TIMER 2 1 WEEKLY TIMER Stop mode Stop mode Stop mode Operation mode Operation mode Se...

Page 18: ...ally after the set day has passed Normal Next day setting If the operating time carries over to the next day during a next day setting the effective DAY OFF range will be set as shown below 2 2 DAY OFF setting 3 TEMPERATURE SET BACK TIMER Stop mode Stop mode Operation mode Stop mode Operation mode Preceding day Next day DAY OFF Stop mode Stop mode Operation mode Stop mode Operation mode DAY OFF Se...

Page 19: ...ler ON TIMER OFF TIMER PROGRAM TIMER SLEEP 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...

Page 20: ...n the cooling operation mode When the sleep timer is set the setting temperature is increased 1 degC It increases the setting temperature another 1 degC after 1 hour After that the setting temperature is not changed and the operation is stopped at the time of timer setting Ts 1degC 2degC 2degC 1degC 4degC 3degC Set 60min In the heating operation mode When the sleep timer is set the setting tempera...

Page 21: ... the temperatures detected by the discharge temperature sensor the indoor heat exchanger sensor the outdoor heat exchanger sensor and the outdoor temperature sensor Pulse range 60 480 pulse 1 Pulse range of EEV 2 The EEV is set up at 480 pulses when the compressor is stopped 3 Intialization Input of 528 pulses toward closing direction is operated under the following condition When the power is tur...

Page 22: ... timer operation is canceled but only setting time is memorized Operation contents memorized when the power is interrupted Operation mode Set temperature Set air flow Timer mode and timer time Thermistor detected position When using the Wired Remote Controller 1 13 4 WAY VALVE EXTENSION SELECT 1 14 AUTO RESTART 01 18 1 15 MANUAL AUTO OPERATION When using the Wireless RC If MANUAL AUTO Button is se...

Page 23: ... EXTERNAL ELECTRICAL HEATER CONTROL For AR Type 01 19 Fig 10 Fresh air control Fig 11 External electrical heater control Operation Stop Operation Stop Fan motor Indoor unit Fan motor for Fresh Air When the room temperature rises When the room temperature drops Ts Setting temperature Heater OFF Heater ON Heater OFF Ts 10 C Ts 1 C Ts 3 C Ts 12 C When the compressor stop External electrical heater is...

Page 24: ...pressor contiguous operation time Defrost operation is released when the conditions become as shown in Table 11 Table 11 Defrost Release Condition Operation temperature Below 10 min Above 10 min Less than 35 min 35 min to 4 hours After 4 hours Does not operate 6 C 3 C Compressor integrating operation time Compressor contiguous operation time Operation temperature Below 10 min Above 10 min Defrosti...

Page 25: ...rating operation Over 240 minutes Compressor integrating operation Over 62 minutes to below 240 minutes Outdoor heat exchanger temperature Below 9 C Outdoor heat exchanger temperature Below 5 C Compressor integrating operation Over 35 minutes to below 240 minutes Outdoor heat exchanger temperature Below 6 C Compressor integrating operation Over 240 minutes Outdoor heat exchanger temperature Below ...

Page 26: ... will allow the heat exchanger to defrost and then stop In heating operation the outdoor heat exchanger temperature is less than 4 C and compressor operation integrating time lasts for more than 30 minutes and compressor operation contiguous time lasts for more than 10 minutes OFF Defrost Flow Chart Heating operation stop 2 OFF DEFROST END CONDITION Outdoor heat exchanger temperature Over 10 C or ...

Page 27: ...dity in the room without significantly lowering the room temperature During ECONOMY OPERATION the thermostat setting automatically changes according to the temperature to avoid Unnecessary cooling and heating for the most economical operation If the room is not cooled or heated well during economy operation select normal operation During the monitor period in the AUTO mode the air conditioner oper...

Page 28: ...e frequency becomes lower than the release value Table 12 Current Release Operation Value Release Value Heating Cooling OT Outdoor Temperature OT Control Release 7 0A 6 5A 9 0A 8 5A 10 5A 10 0A 12 0A 11 5A 17 C 12 C OT Outdoor Temperature 5 C AO A18LALL AO B18LALL OT Control Release 7 0A 6 5A 9 0A 8 5A 11 5A 11 0A 13 0A 12 5A 17 C 12 C OT Outdoor Temperature 5 C AO A24LALL AO B24LALL OT Control Re...

Page 29: ...ture Fig 12 Cooling Pressure Over Rise Protection Control Compressor is OFF Hold The compressor frequency is decreased 2Hz every 60seconds Release of protection The forced cooling operation starts up when MANUAL AUTO button is pressed more than 10 seconds During the forced cooling operation it keeps operation regardless of detection value of room temperature sensor Operation LED and Timer LED ligh...

Page 30: ...2 TROUBLE SHOOTING R410A FLOOR CEILING DUCT CASSETTE type INVERTER ...

Page 31: ...ation signal error Forward transfer signal error 2 1 1 WIRED REMOTE CONTROLLER DISPLAY CT error Communication error indoor unit remote control Communication error Main PCB Display PCB Communication error Main PCB Display PCB IPM error Compressor rotor location cannot detect permanent stop Compressor temperature sensor error Compressor temperature error 4 way valve error 1 SELF DIAGNOSIS 1 2 5 6 7 ...

Page 32: ...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 select the error history number SU MO TU WE TH FR SA Error code Error history number 0 1 2 3 4 5 6 7 F E d c b A 9 8 Lower Raise ...

Page 33: ...ation 0 5sec 0 5sec 2sec ON OFF 1 ERROR DISPLAY Outdoor LED Blink 1 to 16 times 0 5sec ON 0 5sec OFF blinking 2 1 2 OUTDOOR UNIT DISPLAY Discharge temperature error Outdoor unit fan motor error 17 Error contents LED Flashing Pattern Trouble shooting Outdoor unit sensor error Discharge or Outdoor or Heat EX In Out IPM error Compressor rotor location cannot detect 14 9 5 7 8 24 25 21 CT error 15 16 ...

Page 34: ...es Communication error indoor unit remote control 7 times 6 times 2 times 2 times 6 6 times 2 times 3 times 2 times 2 times 3 times 3 times 3 times 4 times 3 times 2 times 4 times 2 times 5 times 15 CT error 3 times 5 times 5 times 5 times 6 times 5 times 18 8 times 5 times 2 times 7 times 3 times 7 times 26 27 4 way valve error 4 times 4 times 7 times 6 times 7 times 10 Indoor EEPROM abnormal Mod...

Page 35: ...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 CN14 terminal 1 3 of Controller PCB 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 Contro...

Page 36: ...t bulb or any electronic equipment which causes harmonic wave Check Point 2 Check Connection Check any 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 connection between Outdoor Unit Main PCB If there is loose connector or open cable Check Point 3 Check the voltage of po...

Page 37: ...OR PIPE TEMP THERMISTOR ROOM TEMP GRAY GRAY BLACK BLACK CN5 CN7 CN8 1 2 1 2 1 2 1 2 Room Temperature Sensor Error Indoor Unit Controller PCB Circuit Room Temperature Thermistor When Room Temperature Thermistor open or short circuit is detected at power ON 1 Connector connection failure 2 Thermistor failure 3 Controller PCB failure Check if connector is removed Check erroneous connection Check if t...

Page 38: ...power ON 1 Connector connection failure 2 Thermistor failure 3 Controller PCB failure Check Point 1 Check connection of 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...

Page 39: ...utlet Error Outdoor Unit Main PCB Circuit Heat Exchanger Temperature Thermistor Outlet When Heat Exchanger Temperature Thermistor Outlet open or short circuit is detected at power ON or while running the compressor 1 Connector connection failure 2 Thermistor failure 3 Main PCB failure Check Point 1 Check connection of Connector Check if connector is removed Check erroneous connection Check if ther...

Page 40: ...Drain Abnormal Indoor Unit Controller PCB Circuit Float Switch When Float Switch is ON for more than 3 minutes 1 Float Switch failure 2 Shorted connector wire 3 Controller PCB failure Check operation of float switch any blocking by dust etc Remove Float switch and check ON OFF switching operation by using a meter If Float switch is detective replace it Check loose contact of CN9 shorted wire pinch...

Page 41: ...ilure 3 Main PCB failure Check Point 1 Check connection of 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 th...

Page 42: ...on failure 2 Thermistor failure 3 Main PCB failure Check Point 1 Check connection of 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 short...

Page 43: ...here anything obstructing the air distribution circuit Is there any clogging of Outdoor Heat Exchanger Is the Fan rotating Check by hand and if it is locked replace the motor Check Outdoor Fan Motor If the Fan Motor is defective replace it Check Point 4 Check Discharge Thermistor Isn t it fallen off the holder Is there a cable pinched Check characteristics of thermistor Refer to Trouble shooting 8...

Page 44: ...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 grounding Note EEPROM EEPROM Electronically Erasable and Programmable Read Only Memory is a non volatile memory which kee...

Page 45: ...tection by surrounding temperature rise 4 Control PCB failure 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 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...

Page 46: ...s noise Check the complete insulation of the grounding Check if there is any equipment that causes harmonic wave near the power cable Neon light bulb or any electronic equipment which causes harmonic wave Check the voltage of power supply Check if AC198 264V appears at Outdoor Unit Terminal L N Check if Indicated value swings between AC70V and AC130V at Outdoor Unit Terminal 2 3 Check any loose or...

Page 47: ...r mis wiring reset the power Check Point 2 Remove connector and check Thermistor resistance value Thermistor Characteristics Rough 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 circuit diagram of outdoor unit and check terminal voltage at Thermistor DC5 0V If the voltage does not appear replace Main PCB 02 16 T...

Page 48: ...pen Upon correcting the removed connector 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 repla...

Page 49: ...e 1 Defective connection of electric components 2 External 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 h...

Page 50: ... PCB Check if connector is removed Check erroneous connection Check if cable is open Upon correcting the removed connector or mis wiring reset the power Refer to PARTS INFORMATION 2 For Compressor Terminal Main PCB While running the compressor if the detected rotor location is out of phase with actual rotor location more than 90 degrees the compressor stops After the compressor restarts if the sam...

Page 51: ...ure around the motor If there is any surrounding equipment that causes heat Upon the temperature coming down restart operation Check Point 3 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 ...

Page 52: ...on ERROR CODE E 20 Trouble shooting 19 INDOOR UNIT INDOOR UNIT Error Method Indicate or Display Detective Actuators Detective details Forecast of Cause OK OK Indoor manual auto switch error Indoor Unit Controller PCB Circuit Forced auto switch When the Forced auto switch becomes ON for 30 consecutive seconds 1 Forced auto switch failure 2 Controller PCB failure Check Point 1 Check the Forced auto ...

Page 53: ...oor 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 Thermistor middle Refer to Trouble shooting 24 If the Thermistor middle is failure r...

Page 54: ...nt 3 Replace Main PCB If Check Point 1 2 do not improve the 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 ha...

Page 55: ...cation show again Check Point 1 2 Check external cause such as noise Check the complete insulation of the grounding Check if there is any equipment that causes harmonic wave near the power cable Neon light bulb or any electronic equipment which causes harmonic wave Check Point 2 Check Connection Check connection between Main PCB and Display PCB If there is loose connector or open cable Check Point...

Page 56: ...cation show again Check Point 1 2 Check external cause such as noise Check the complete insulation of the grounding Check if there is any equipment that causes harmonic wave near the power cable Neon light bulb or any electronic equipment which causes harmonic wave Check Point 2 Check Connection Check connection between Main PCB and Display PCB If there is loose connector or open cable Check Point...

Page 57: ...iddle Error Outdoor Unit Main PCB Circuit Heat Exchanger Temperature Thermistor Middle When Heat Exchanger Temperature Thermistor Middle open or short circuit is detected at power ON or while running the compressor 1 Connector connection failure 2 Thermistor failure 3 Main PCB failure Check Point 1 Check connection of Connector Check if connector is removed Check erroneous connection Check if ther...

Page 58: ...anything obstructing the air distribution circuit Is there any clogging of Outdoor Heat Exchanger Is the Fan rotating Check by hand and if it is locked replace the motor Check Outdoor Fan Motor If the Fan Motor is defective replace it Check Point 4 Check Compressor Thermistor Isn t it fallen off the holder Is there a cable pinched Check characteristics of thermistor Refer to Trouble shooting 13 If...

Page 59: ...Check Point 3 Check the solenoid coil and 4 way valve Remove CN30 from PCB and check the resistance value of coil Resistance value is about 1 4k If it is Open or abnormal resistance value replace Solenoid Coil 02 28 Outdoor Unit No indication Cooling or Dry operation Indoor heat exchanger temp Room temp 10degC Heating operation indoor heat exchanger temp room temp 10degC If the same operation is r...

Page 60: ... wiring reset the power Check Point 3 Check the solenoid coil and 4 way valve Remove CN30 from PCB and check the resistance value of coil Resistance value is about 1 4k If it is Open or abnormal resistance value replace Solenoid Coil 02 29 Outdoor Unit No indication Cooling or Dry operation Outdoor heat exchanger temp Outdoor temp 10degC Heating operation Outdoor heat exchanger temp Outdoor temp 1...

Page 61: ...connection of electric components 2 Main PCB failure 3 Compressor failure Check Point 2 Check connection of around the Compressor components OK OK OK OK Check Point 3 Replace Main PCB If Check Point 1 2 do not improve the symptom replace Main PCB Check if connector is removed Check erroneous connection Check if cable is open Upon correcting the removed connector or mis wiring reset the power Refer...

Page 62: ...s 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 Point 3 Check Electrical Components Check Voltage of power supply Check AC198 264V appears at Indoor Unit Terminal 1 2 Power Supply Check Fuse in...

Page 63: ...rcuit 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 grounding Check the voltage of power supply Check if AC198 264V appears at Outdoor Unit Terminal L N Check Fuse in ...

Page 64: ... manual and Data Technical Manual Turn off Power and check correct followings Is 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 w...

Page 65: ...30 Check any objects 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 ...

Page 66: ...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 67: ...d Locked compressor 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 Compres...

Page 68: ...7 W9 RED WHITE BLACK Compressor Inverter Compressor Check terminal connection of Compressor loose or incorrect wiring Check connection of Main PCB 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 Resistance Value 0 73 For AOY 18LALL 0 97 For AOY 24LALL...

Page 69: ...WHITE 1 2 3 4 5 6 at 20 C Outdoor unit Electronic Expansion Valve EEV Check connection of connector 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...

Page 70: ...3 APPENDING DATA R410A FLOOR CEILING DUCT CASSETTE type INVERTER ...

Page 71: ...s in the table below according to the height of the ceiling The unit is factory set to 00 Factory setting Setting Description Function Number Setting Value Standard Long interval Short interval No indication 11 00 01 02 03 1 1 Setting the Filter Sign For AB AU type The indoor unit has a sign to inform the user that it is time to clean the filter Select the time setting for the filter sign display ...

Page 72: ...tion Number Setting Value Standard Lower control Slightly warmer control Warmer control 31 00 01 02 03 1 6 Setting the Heater Room Temperature Correction Depending on the installed environment the room temperature sensor may require a correction The settings may be changed as shown in the table below 1 5 Setting the Cooler Room Temperature Correction Factory setting Setting Description Function Nu...

Page 73: ...ol unit signal code and the printed circuit board setting If these are not confirmed the remote control unit can not be used to operate for the air conditioner JM1 JM2 Remote control unit Signal code Connect Disconnect Connect Disconnect A Primary setting b c d Connect Connect Disconnect Disconnect Jumper wire ...

Page 74: ...isplay flashes as shown to the right during setting value selection 7 After completing the FUNCTION SETTING be sure to turn off the power and turn it on again 5 Press the SET button to confirm the setting Press the SET button for a few seconds until the setting value stops flashing If the setting value display changes or if is displayed when the flashing stops the setting value has not been set co...

Page 75: ...e ON ON OFF 1 2 3 4 5 6 1 SW setting 1 1 Dual remote controller setting Number of remote controller DIP SW 1 No 2 DIP SW 1 No 2 Master unit Slave unit ON OFF OFF 1 Normal 2 Dual Set the remote controller DIP switch 1 No 2 according to the following table Factory setting Memory backup Invalidity DIP SW No 6 ON Validity OFF Factory setting Set to ON to use batteries for the memory backup if batterie...

Page 76: ... Mode at previous operation Set temperature 24 C Temperature at previous operation Air ßow mode AUTO Mode at previous operation Up down air direction swing Standard air direction swing OFF Air direction at previous operation Left right air direction swing Standard air direction swing OFF Air direction at previous operation Circuit diagram example Indoor control PC board Relay circuit Input device ...

Page 77: ...F is switched according to the set temperature and room temperature difference Circuit diagram example Procured at the site Example Heater Indoor control PC board Relay circuit CN10 1 13 5 V 2 Signal Relay power supply CN15 for high static pressure duct type ON OFF ON OFF Heating operation Signal Parts Optional Model name Parts No UTD ECS5A 9077359004 When heater is connected clay is indispensable...

Page 78: ...t However signal becomes OFF during cold air prevention control operation Circuit diagram example Example Fan Procured at the site Indoor control PC board Relay circuit CN6 1 13 5 V 2 Signal Relay power supply CN14 for high static pressure duct type ON OFF ON OFF Indoor fan Signal Parts Optional Model name Parts No UTD ECS5A 9077359004 Wire Fresh air output ...

Page 79: ...Circuit diagram example Procured at the site Display Indoor control PC board Relay circuit 1 2 Signal Relay power supply 5 to 24V V CN103 ON OFF ON OFF Air conditioner Signal Parts Optional Duct type Model name Parts No UTD ECS5A 9077359004 Wire External output Other than duct type Model name Parts No UTY XWZX 9028651003 Wire External output Blue Purple ...

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Fujitsu AB F18LAT Series, Service Instruction

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