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Fujitsu AB F18LAT Series Service Instruction

Split type, room air, conditioner, floor ceiling type, duct type, cassette type models indoor unit outdoor unit inverter
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SERVICE
INSTRUCTION
R410A
SPLIT TYPE
ROOM AIR CONDITIONER
Floor Ceiling
Duct
Cassette
Models Indoor unit
AB*F18LAT
AB*F18LBT
AB*F24LAT
AB*F24LBT
type
type
INVERTER
Outdoor unit
AR*F18LALU
AO*A18LALL
AR*F18LBLU
AO*B18LALL
AR*A24LATU
AO*A24LALL
AR*F24LBTU
AO*B24LALL
AU*F18LAL
AU*F18LBL
AU*A24LBL
AU*F24LBL
type

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Summary of Contents for Fujitsu AB F18LAT Series

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER Floor Ceiling type Duct type Cassette type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AR*F18LALU AB*F18LAT AO*A18LALL AR*F18LBLU AO*B18LALL AB*F18LBT AR*A24LATU AO*A24LALL AB*F24LAT AR*F24LBTU AO*B24LALL AB*F24LBT AU*F18LAL AU*F18LBL AU*A24LBL AU*F24LBL R410A...

  • Page 2: Table Of Contents

    CONTENTS 1. DESCRIPTION OF EACH CONTROL OPERATION COOLING OPERATION................... 01-01 HEATING OPERATION.................... 01-02 DRY OPERATION..................... 01-03 AUTO CHANGEOVER OPERATION............... 01-04 INDOOR FAN CONTROL..................01-05 OUTDOOR FAN CONTROL..................01-08 LOUVER CONTROL....................01-09 COMPRESSOR CONTROL..................01-12 TIMER OPERATION CONTROL................01-13 1-10 ELECTRONIC EXPANSION VALVE CONTROL............. 01-17 1-11 TEST OPERATION CONTROL................
  • Page 3 3. APPENDING DATA FUNCTION SETTING....................03-01 3-1-1 INDOOR UNIT...................... 03-01 3-1-2 Switching Remote Control Unit Signal Codes............03-03 3-1-3 Procedures to change the Function Setting............03-04 3-1-4 WIRED REMOTE CONTROLLER............... 03-05 EXTERNAL INPUT & OUTPUT................03-06...

  • Page 4: Description Of Each Control Operation

    R410A FLOOR CEILING / DUCT / CASSETTE type INVERTER 1 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 5: Cooling Operation

    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.

  • Page 6: Heating Operation

    1-2. HEATING OPERATION 1-2-1 HEATING 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 2 based on the outdoor temperature. * If the room temperature is lower 3 degC than a set temperature, the compressor operation frequency will attain to maximum frequency.

  • Page 7: Dry Operation

    1-3. DRY OPERATION 1-3-1 INDOOR UNIT CONTROL The compressor rotation frequency shall change according to set temperature and room temperature variation which the room temperature sensor of the indoor unit has detected as shown in the Fig 3. ( Table 3 : Compressor frequency ) Operating frequency AB*F18, 24 AR*F18, 24...

  • Page 8: Auto Changeover Operation

    1-4. 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 swiched in accordance with temperature changes. The temperature can be set between 18°C and 30°C in 1 degC steps.

  • Page 9: Indoor Fan Control

    1-5. INDOOR FAN CONTROL 1. Fan speed ( Table 5 : Indoor Fan Speed ) AB*F18LAT / AB*F18LBT AB*F24LAT / AB*F24LBT Operation mode Air flow mode Operation mode Air flow mode Speed (rpm) Speed (rpm) Cooling 1040 Cooling 1330 1150 1000 Quiet Quiet...
  • Page 10 3. COOLING OPERATION 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 5. COOL AIR PREVENTION CONTROL (Heating mode) The maximum value of the indoor fan speed is set as shown in Figure 8, based on the detected temperature by the indoor heat exchanger sensor on heating mode. When the compressor does not operate, the indoor fan motor operates [S-Lo] mode. ( Fig.8 : Cool Air Prevention Control ) 5-1.

  • Page 12: Outdoor Fan Control

    1-6. OUTDOOR FAN CONTROL 1. Outdoor Fan Motor Following table shows the fan speed of the outdoor unit. Table 6 : Fan speed of the outdoor unit Outdoor temperature Cooling Over than 12°C 860/ 820/ 670/ 500 rpm AO*A18LALL 500 rpm AO*B18LALL Less than 12°C 400/ 340/ 280/ 250/ 230 rpm...

  • Page 13: Louver Control

    1-7. LOUVER CONTROL 1. For Ceiling Type (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig.9 : Air Direction Range) (Operation Range) During Cooling/Dry mode : During Heating mode Fan mode Use the air direction adjustments within the ranges shown above. The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.
  • Page 14 (Function Range) Each time the button is pressed, the air direction range will change as follows: RIGHT/LEFT air direction louvers (Fig.10 : Air Direction Range) Use the air direction adjustments within the ranges shown above. The remote control unit's display does not change. 1-4.
  • Page 15 (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig.9 : Air Direction Range) (Operation Range) During Cooling/Dry mode/Fan mode : During Heating mode Use the air direction adjustments within the ranges shown above. The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

  • Page 16: Compressor Control

    1-8. COMPRESSOR CONTROL 1. OPERATION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in Table 8. (Table 8 : Compressor Operation Frequency Range) Cooling Heating AO*A18LALL 18Hz 113Hz 18Hz 120Hz 34Hz AO*B18LALL AO*A24LALL 18Hz...

  • Page 17: Timer Operation Control

    1-9. TIMER OPERATION CONTROL 1-9-1 Wired Remote Controller AR-6TC1 ON / TIMER OFF / TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER 1. ON / OFF TIMER OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 18 2-2. DAY OFF setting The DAY OFF setting is only available for days for which weekly settings already exist. 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. Normal DAY OFF Operation mode...
  • Page 19 1-9-2 Wireless Remote Controller AR-SY1 ON / TIMER OFF / TIMER PROGRAM TIMER SLEEP TIMER 1. ON / OFF TIMER OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer ON timer : When the clock reaches the set time, the air conditioner will be turned on.
  • Page 20 3. SLEEP TIMER If the sleep timer is set, the room temperature is monitored and the operation is stopped automatically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time ON. In the cooling operation mode When the sleep timer is set, the setting temperature is increased 1 degC.

  • Page 21: Electronic Expansion Valve Control

    1-10. ELECTRONIC EXPANSION VALVE CONTROL The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the following values. The compressor frequency, the temperatures detected by the discharge temperature sensor, the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor.

  • Page 22: 4-Way Valve Extension Select

    1-13. 4-WAY VALVE EXTENSION SELECT At the time when the air conditioner is switched from the cooling mode to heating mode, the compressor is stopped, and the 4-way valve is switched in 3 minutes later after the compressor stopped. 1-14. AUTO RESTART When the power was interrupted by a power failure, etc.

  • Page 23: Fresh Air Control

    1-16. FRESH AIR CONTROL The fan motor for Fresh Air is operated in synchronization with the indoor fan operation as shown in Figure 10. (Fig.10 : Fresh air control) Operation Fan motor (Indoor unit) Stop Operation Fan motor (for Fresh Air) Stop 1-17.

  • Page 24: Compressor Preheating

    1-18. COMPRESSOR PREHEATING When the outdoor heat exchanger temperature is lower than 5°C and the heating operation has been stopped for 30 minutes, power is applied to the compressor and the compressor is heated. (By heating the compressor, warm air is quickly discharged when operation is started.) When operation was started, and when the outdoor temperature rises to 7°C or greater, preheating is ended.
  • Page 25 3. Defrost Flow Chart The defrosting shall proceed by the integrating operation time and outdoor heat exchanger emperature as follows. Heating operation start : Compressor ON (Not defrosted for 10 minutes) (In case of 1st defrost) (In case of 2nd and later defrost) Compressor integrating Compressor integrating Compressor integrating...

  • Page 26: Off Defrost Operation Control

    1-20. OFF DEFROST OPERATION CONTROL When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost, and then stop.

  • Page 27: Economy Operation

    1-21. ECONOMY OPERATION At the maximum output, ECONOMY OPERATION is approximately 70% of normal air conditioner operation for cooling and heating. When ECONOMY OPERATION is performed during the cooling mode,dehumidification is improved. This function is especially convenient when you want to remove the humidity in the room without significantly lowering the room temperature.

  • Page 28: Various Protections

    1-22. VARIOUS PROTECTIONS 1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas temperature. When the discharge temperature becomes higher than 104°C, the compressor frequency is decreased 20 Hz, and it continues to decrease the frequency for 20 Hz every 120 seconds until the temperature becomes lower than 101°C.

  • Page 29: Forced Cooling Operation

    4. COOLING PRESSURE OVER RISE PROTECTION On cooling mode, the compressor frequency is controlled as following based on the detection value of the outdoor heat exchanger temperature sensor. (Fig.12 : Cooling Pressure Over Rise Protection Control) Outdoor heat exchange temperature Compressor is OFF 67°C The compressor frequency is...

  • Page 30: Trouble Shooting

    R410A FLOOR CEILING / DUCT / CASSETTE type INVERTER 2 . TROUBLE SHOOTING...

  • Page 31: Error Display

    2. TROUBLESHOOTING 2-1 ERROR DISPLAY 2-1-1 WIRED REMOTE CONTROLLER DISPLAY 1. SELF - DIAGNOSIS When "EE" in Temperature Display is displayed, inspection of the air conditioning system is necessary. Please consult authoilzed servise personnel. Unit number (usually 0) Error code SU MO TU WE TH FR SA ex.
  • Page 32 2. ERROR CODE HISTORY DISPLAY Up to 16 memorized 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. Error code Error history number SU MO TU WE TH FR SA...
  • Page 33 2-1-2 OUTDOOR UNIT DISPLAY 1. ERROR DISPLAY Trouble LED Flashing Pattern Error contents shooting Continuously lighting Discharge temperature error IPM error 0.5sec ON / 0.5sec OFF CT error 2sec ON / 2sec OFF Compressor rotor location cannot detect 16,28 0.1sec ON / 2sec OFF Outdoor unit sensor error 5,7,8,24 0.1sec ON / 0.1sec OFF...
  • Page 34 2-1-3 INDOOR UNIT DISPLAY 1. ERROR DISPLAY The OPERATION, TIMER and FILTER lamps operate as follows according to the error contents. Error display Trouble Error contents shooting OPERATION TIMER FILTER (GREEN) (ORANGE) (RED) Communication error 2 times (Serial reverse transfer error) 3 times Outdoor communication signal error 4 times...

  • Page 35: Trouble Shooting With Error Code

    2-2 TROUBLE SHOOTING WITH ERROR CODE Trouble shooting 1 Indicate or Display: INDOOR UNIT Error Method: Outdoor Unit : No indication Communication Error ERROR CODE : E : 00 (Indoor unit Remote control) Detective details: Detective Actuators: When the indoor unit cannot receive the signal from Wired Remote Indoor unit controller PCB circuit more than 10seconds after power ON, or the indoor unit cannot receive Wired Remote Control...
  • Page 36 Indicate or Display: Indicate or Display: Trouble shooting 2 OUTDOOR UNIT Error Method: Outdoor Unit : No indication Communication Error ERROR CODE : E : 01 (Serial Reverse Transfer Error) Detective details: Detective Actuators: When the indoor unit cannot receive the serial signal from Outdoor unit Outdoor Unit Main PCB Circuit more than 10seconds, then permanent stop after 20seconds.
  • Page 37 Indicate or Display: Trouble shooting 3 INDOOR UNIT Error Method: Outdoor Unit : No indication INDOOR UNIT ERROR CODE : E : 02 Room Temperature Sensor Error Detective details: Detective Actuators: Indoor Unit Controller PCB Circuit When Room Temperature Thermistor open or short-circuit is detected at power ON.
  • Page 38 Indicate or Display: Trouble shooting 4 INDOOR UNIT Error Method: Outdoor Unit : No indication INDOOR UNIT Indoor Heat Exchanger Temperature ERROR CODE : E : 04 Sensor Error Detective Actuators: Detective details: Indoor Unit Controller PCB Circuit When Heat Exchanger Temperature Thermistor open or short-circuit is detected at power ON.
  • Page 39 Trouble shooting 5 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF Outdoor Heat Exchanger Temperature ERROR CODE : E : 06 Sensor (Outlet) Error Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When Heat Exchanger Temperature Thermistor (Outlet) open or Heat Exchanger Temperature short-circuit is detected at power ON or while running the compressor.
  • Page 40 ( For AU Type ) Indicate or Display: Trouble shooting 6 Indoor Unit : No LED INDOOR UNIT Error Method: Outdoor Unit : No indication Water Drain Abnormal ERROR CODE : E : 09 Detective Actuators: Detective details: Indoor Unit Controller PCB Circuit When Float Switch is ON for more than 3 minutes.
  • Page 41 Trouble shooting 7 Indicate or Display: OUTDOOR UNIT Error Method: INDOOR UNIT Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF Outdoor Temperature Sensor Error ERROR CODE : E : 0A Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When Outdoor Temperature Thermistor open or short-circuit is detected at power ON or while running the compressor.
  • Page 42 Trouble shooting 8 Indicate or Display: OUTDOOR UNIT Error Method: INDOOR UNIT Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF Outdoor Discharge Pipe Temperature ERROR CODE : E : 0C Sensor Error Detective details: Detective Actuators: When Discharge Pipe Temperature Thermistor open or short-circuit Outdoor Unit Main PCB Circuit is detected at power ON or while running the compressor.
  • Page 43 Trouble shooting 9 Indicate or Display: OUTDOOR UNIT Error Method: INDOOR UNIT Outdoor Unit : LED continuously lighting Discharge temperature error ERROR CODE : E : 0F Detective details: Detective Actuators: When the discharge temperature becomes higher than 110°C, Outdoor Unit Main PCB Circuit the compressor stops.
  • Page 44 Trouble shooting 10 Indicate or Display: Indicate or Display: INDOOR UNIT Error Method: Outdoor Unit : No indication Indoor EEPROM abnormal ERROR CODE : E : 11 (Model No.) Detective details: Detective Actuators: Indoor Unit Controller PCB circuit When the model information being read from EEPROM has an apparent error.
  • Page 45 Indicate or Display: Trouble shooting 11 INDOOR UNIT Error Method: Outdoor Unit : No indication Indoor Fan Motor abnormal ERROR CODE : E : 12 Detective Actuators: Detective details: Indoor Unit Controller PCB Circuit When the condition that actual frequency of Indoor Fan is Indoor Fan Motor below 1/3 of target frequency is continued more than 56 seconds.
  • Page 46 Trouble shooting 12 Indicate or Display: Indicate or Display: INDOOR UNIT Error Method: Outdoor Unit : No indication Outdoor Communication Signal Error ERROR CODE : E : 13 (Forward Transfer Signal Error) Detective details: Detective Actuators: Indoor Unit Controller PCB Circuit When the outdoor unit cannot receive the serial signal from Indoor unit more than 10seconds.
  • Page 47 Trouble shooting 13 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF Compressor Temperature Sensor Error ERROR CODE : E : 15 Detective Actuators: Detective details: When Compressor Temperature Thermistor open or short-circuit is Outdoor Unit Main PCB Circuit detected at power ON or while running the compressor.
  • Page 48 Trouble shooting 14 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 0.5sec ON/ 0.5sec OFF IPM error (Permanent Stop) ERROR CODE : E : 17 Detective details: Detective Actuators: When more than normal operating current to IPM in Main PCB flows, Outdoor Unit Main PCB Circuit the compressor stops.
  • Page 49 Trouble shooting 15 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 2sec ON/ 2sec OFF CT error ERROR CODE : E : 18 Detective details: Detective Actuators: When Input Current Sensor has detected 0A, while Inverter Compressor is Outdoor Unit Main PCB Circuit operating at higher than 56Hz, after 1minute upon starting the Compressor.
  • Page 50 Trouble shooting 16 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 0.1sec ON/ 2sec OFF Compressor rotor location cannot detect ERROR CODE : E : 1A (Permanent Stop) Detective details: Detective Actuators: While running the compressor, if the detected rotor location is out of Outdoor Unit Main PCB Circuit phase with actual rotor location more than 90 degrees, Compressor...
  • Page 51 Trouble shooting 17 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 5sec ON/ 5sec OFF Outdoor Unit Fan Motor Error ERROR CODE : E : 1b Detective Actuators: Detective details: When outdoor fan rotation speed is less than 100rpm in 20 seconds Outdoor Unit Main PCB Circuit after fan motor starts, fan motor stops.
  • Page 52 Indicate or Display: Trouble shooting 18 OUTDOOR UNIT Error Method: Outdoor Unit : No indication INDOOR UNIT Outdoor unit computer ERROR CODE : E : 1c communication error Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When it cannot receive an effective signal for 10sec between the Main CPU and Sub CPU in outdoor unit.
  • Page 53 Indicate or Display: Trouble shooting 20 OUTDOOR UNIT Error Method: Outdoor Unit : No indication Excessive high pressure protection ERROR CODE : E : 24 on cooling Detective details: Detective Actuators: Excessive high pressure protection on cooling mode has been Outdoor Unit Main PCB Circuit activated.
  • Page 54 Indicate or Display: Trouble shooting 21 OUTDOOR UNIT Error Method: Outdoor Unit : No indication INDOOR UNIT ERROR CODE : E : 25 PFC circuit error Detective Actuators: Detective details: When inverter output DC voltage is higher than 415V for over 3 seconds, Outdoor Unit Main PCB Circuit the compressor stops.
  • Page 55 ( For AB, AU Type ) Indicate or Display: Indicate or Display: Trouble shooting 22 OUTDOOR UNIT Error Method: Outdoor Unit : No indication Communication Error ERROR CODE : E : 26 (Main PCB ---> Display PCB) Detective details: Detective Actuators: When the Display PCB cannot receive the signal from the Main PCB.
  • Page 56 ( For AB, AU Type ) Indicate or Display: Indicate or Display: Trouble shooting 23 OUTDOOR UNIT Error Method: Outdoor Unit : No indication Communication Error ERROR CODE : E : 27 (Main PCB <--- Display PCB) Detective details: Detective Actuators: When the Main PCB cannot receive the signal from the Display PCB.
  • Page 57 Trouble shooting 24 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF Outdoor Heat Exchanger Temperature ERROR CODE : E : 29 Sensor (Middle) Error Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When Heat Exchanger Temperature Thermistor (Middle) open or Heat Exchanger Temperature short-circuit is detected at power ON or while running the compressor.
  • Page 58 Trouble shooting 25 Indicate or Display: OUTDOOR UNIT Error Method: INDOOR UNIT Outdoor Unit : LED 2sec ON/ 5sec OFF Compressor temperature error ERROR CODE : E : 2b Detective details: Detective Actuators: When the compressor temperature becomes higher than 110°C, Outdoor Unit Main PCB Circuit the compressor stops.
  • Page 59 Trouble shooting 26 Indicate or Display: INDOOR UNIT Error Method: Outdoor Unit : No indication 4-way valve error ERROR CODE : E : 2c Detective Actuators: Detective details: When the indoor heat exchanger temperature is compared with Indoor Unit Controller PCB Circuit the room temperature, and either following condition is detected Heat Exchanger Temperature Thermistor continuously two times, the compressor stops.
  • Page 60 Trouble shooting 27 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : No indication 4-way valve error ERROR CODE : E : 2c Detective Actuators: Detective details: When the outdoor heat exchanger temperature is compared with Outdoor Unit Main PCB Circuit the outdoor temperature, and either following condition is detected Heat Exchanger Temperature continuously two times, the compressor stops.
  • Page 61 Trouble shooting 28 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Unit : LED 0.1sec ON/ 2sec OFF Compressor Start-up error ERROR CODE : E : 1A (Permanent Stop) Detective Actuators: Detective details: Compressor rotor position operation is retried up to 50 times. Outdoor Unit Main PCB Circuit If start-up is not available by , Start-up trial of rotor position operation is...

  • Page 62: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 29 1. Power Supply failure 2. External cause Indoor Unit - No Power 3. Electrical Components defective Check Point 1 : Check Installation Condition Isn’t the breaker down? Check loose or removed connection cable.
  • Page 63 Forecast of Cause: Trouble shooting 30 1. Power Supply failure 2. External cause Outdoor Unit - No Power 3. Electrical Components defective Check Point 1 : Check Installation Condition Isn’t the breaker down? Check loose or removed connection cable. >>If abnormal condition is found, correct it by referring to Installation Manual or Data &...
  • Page 64 Forecast of Cause: Trouble shooting 31 1. Setting/ Connection failure 2. External cause No Operation (Power is ON) 3. Electrical Component defective Check Point 1 : Check indoor and outdoor installation condition Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control, or terminals between Indoor Units. Or, check if there is an open cable connection.
  • Page 65 Forecast of Cause: Trouble shooting 32 1. Indoor Unit error 2. Outdoor Unit error No Cooling / No Heating 3. Effect by Surrounding environment 4. Connection Pipe / Connection Wire failure 5. Refrigeration cycle failure Check Point 1 : Check Indoor Unit Does Indoor Unit FAN run on HIGH FAN? Is Air Filter dirty? Is Heat Exchanger clogged?
  • Page 66 Forecast of Cause : Trouble shooting 33 1. Abnormal installation (Indoor/ Outdoor) 2. Fan failure(Indoor/ Outdoor) Abnormal Noise 3. Compressor failure (Outdoor) Diagnosis method when Abnormal Noise is occurred Abnormal noise is coming from Indoor Unit. Abnormal noise is coming from Outdoor Unit. (Check and correct followings) (Check and correct followings) Is Main Unit installed in stable condition?

  • Page 67: Service Parts Information

    2-4 SERVICE PARTS INFORMATION SERVICE PARTS INFORMATION 1 Compressor Diagnosis method of Compressor ( If Outdoor Unit LED displays Error, refer to Trouble shooting ) Abnormal noise Stops soon after starting up Does not start up Check if vibration noise by Is there open or loose connection Is there open or loose connection loose bolt or contact noise...
  • Page 68 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check Connection Check terminal connection of Compressor Check connection of Main PCB (loose or incorrect wiring) (Loose or incorrect wiring) Terminal cover opened (RED) (RED) MAIN PCB C(T) (WHITE) (WHITE) (BLACK) (BLACK) BLACK...
  • Page 69 SERVICE PARTS INFORMATION 3 Outdoor unit Electronic Expansion Valve ( EEV ) Check Point 1 : Check Connections Check connection of connector. ( Loose connector or open cable ) EXPANSION VALVE COIL BROWN BLUE CN40 ORANGE YELLOW WHITE Check Point 2 : Check Coil of EEV Check Point 3 : Check Voltage from Main PCB.

  • Page 70: Appending Data

    R410A FLOOR CEILING / DUCT / CASSETTE type INVERTER 3 . APPENDING DATA...

  • Page 71: Function Setting

    3-1. FUNCTION SETTING 3-1-1 INDOOR UNIT Follow the instructions in the Local Setup Procedure, which is supplied with the remote control, in accordance with the installed condition. After the power is turned on, perform the Function Setting on the remote control. The settings may be selected between the following two: Function Number or Setting Value.
  • Page 72 1-4. Setting the Outlet Directions (For AU type) Select the setting values in the table below for using a 3-way outlet. (The unit is factory set to "00".) Factory setting) Setting Description Function Number Setting Value 4-way 3-way 1-5. Setting the Cooler Room Temperature Correction Depending on the installed environment, the room temperature sensor may require a correction.

  • Page 73: Switching Remote Control Unit Signal Codes

    3-1-2 Switching Remote Control Unit Signal Codes (For AB, AU type) Confirm the setting of the remote control 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. Jumper wire Remote control unit Signal code...

  • Page 74: Procedures To Change The Function Setting

    3-1-3 Procedures to change the Function Setting This procedure changes the function settings used to control the indoor unit according to the installation conditions. Incorrect settings can cause the indoor unit to malfunction. This procedure should be performed by authorized installation or service personnel only. Perform the "FUNCTION SETTING"...

  • Page 75: Wired Remote Controller

    3-1-4 WIRED REMOTE CONTROLLER Wired remote controller Can be used. ( Do not change.) Dual remote controller setting Filter reset operation and filter display ( Duct model is nonfunctional.) DIP SW Can be used. ( Do not change.) Can be used. ( Do not change.) Memory backup setting SWITCH POSITION Wired remote controller...

  • Page 76: External Input & Output

    3-2. EXTERNAL INPUT & OUTPUT EXTERNAL INPUT Start / stop input Corresponding indoor units : All indoor units Contents of operation : The air conditioner can be remotely operated by means of the following on-site work. Operation is started at the following contents by adding the contact input of a commercial ON/OFF switch to a connector (CN102) on the external control PC board and turning it ON.
  • Page 77 EXTERNAL OUTPUT External electrical heater control output Corresponding indoor units : Duct type Contents of operation : A signal linked to heating operation, indoor fan ON, and compressor ON can be output. * Signal ON / OFF is switched according to the set temperature and room temperature difference.
  • Page 78 Fresh air control output Corresponding indoor units : All indoor units Contents of operation : A signal linked to air conditioner indoor fan ON can be output. * However, signal becomes OFF during cold air prevention control operation. Circuit diagram example Indoor control PC board Relay circuit...
  • Page 79 Operation status output Corresponding indoor units: All indoor units Contents of operation: An air conditioner operation status signal can be output. Circuit diagram example Indoor control PC board Relay circuit Display CN103 5 to 24V Relay power supply Signal Procured at the site Air conditioner Signal Parts (Optional)

This manual is also suitable for:

Ab f18lbt seriesAb f24lat seriesAb f24lbt seriesAr f18lalu seriesAr f18lblu seriesAr a24latu series ... Show all

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