Fujitsu ABU18RULX Service Instruction
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Fujitsu ABU18RULX Service Instruction

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SERVICE
INSTRUCTION
R410A
SPLIT TYPE
ROOM AIR CONDITIONER
Universal Floor / Ceiling
& Large Ceiling
INVERTER
Models Indoor unit Outdoor unit
ABU18RULX
ABU24RULX
ABU36RSLX
type
AOU18RLX
AOU24RLX
AOU36RLX
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Summary of Contents for Fujitsu ABU18RULX

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER Universal Floor / Ceiling & Large Ceiling type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AOU18RLX ABU18RULX AOU24RLX ABU24RULX AOU36RLX ABU36RSLX R410A...

  • Page 2: Table Of Contents

    CONTENTS 1. DESCRIPTION OF EACH CONTROL OPERATION 1. COOLING OPERATION....................01-01 2. HEATING OPERATION....................01-02 3. DRY OPERATION...................... 01-03 4. AUTO CHANGEOVER OPERATION................. 01-04 5. INDOOR FAN CONTROL................... 01-05 6. OUTDOOR FAN CONTROL..................01-07 7. LOUVER CONTROL....................01-08 8. COMPRESSOR CONTROL..................01-10 9.

  • Page 3: Description Of Each Control Operation

    R410A Universal Floor / Ceiling & Large Ceiling type INVERTER 1 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 4: Cooling Operation

    However, the maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode and the outdoor temperature. ( Table 1 : Compressor Frequency Range ) minimum maximum frequency frequency ABU18RULX 20Hz 63Hz ABU24RULX 20Hz 80Hz ABU36RSLX...

  • Page 5: Heating Operation

    However, the maximum frequency is limited in the range shown in Figure 2 based on the outdoor temperature. ( Table 2 : Compressor Frequency Range ) minimum maximum frequency frequency 20Hz 87Hz ABU18RULX 20Hz 87Hz ABU24RULX 20Hz 95Hz ABU36RSLX ( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature ) Outdoor air...

  • Page 6: Dry Operation

    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 Table 3. ( Table 3 : Compressor frequency ) Operating frequency ABU18RULX 25Hz ABU24RULX 30Hz ABU36RSLX 45Hz ( Fig.3 : Compressor Control based on Room Temperature )

  • Page 7: Auto Changeover Operation

    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 and MONITORING modes. During operation, the optimum mode is automatically swiched in accordance with temperature changes. The temperature can be set between 64°F(18°C) and 88°F(30°C) in 2 degF(1 degC) steps.

  • Page 8: Indoor Fan Control

    5. INDOOR FAN CONTROL 1. Fan speed ( Table 5 : Indoor Fan Speed ) ABU18RULX ABU24RULX Operation mode Air flow mode Speed (rpm) Operation mode Air flow mode Speed (rpm) Heating 1100 Heating 1060 1000 S-Lo S-Lo Cooling 1180...
  • Page 9 4. HEATING OPERATION When the airflow is set to [AUTO], the indoor fan ( Fig.6 : Airflow change - over ( Heating : AUTO ) ) motor operates [MED] mode. Indoor heat exchanger Then the indoor fan motor will run according temperature to a room temperature, as shown in Figure 6.

  • Page 10: Outdoor Fan Control

    When the compressor frequency and outdoor temperature decrease, the outdoor fan speed also changes to the lower speed.) For ABU18RULX It runs at 250rpm for 20 seconds after starting up the outdoor fan. When the outdoor heat exchanger tenperature is lower than 35.6°F (2°C), the fan speed switches to 780rpm on heating mode.

  • Page 11: Louver Control

    7. LOUVER CONTROL (Function Range) (Fig.8 : Air Direction Range) Each time the button is pressed, the air direction range will ABU18/ 24RULX change as follows: UNIVERSAL FLOOR/ CEILING TYPE) For ABU18/ 24RULX For ABU36RSLX (Operation Range) For ABU18/ 24RULX ABU36RSLX LARGE CEILING TYPE) Cooling / Dry mode...
  • Page 12 (Function Range) (Fig.9 : Air Direction Range) Each time the button is pressed, the air direction range will ABU18/ 24RULX change as follows: UNIVERSAL FLOOR/ CEILING TYPE) (Operation Range) Cooling / Dry mode Heating mode Fan mode ABU36RSLX Use the air direction adjustments within the ranges shown above. LARGE CEILING TYPE) The horizontal airflow direction is set automatically on after initialization.

  • Page 13: Compressor Control

    8. COMPRESSOR CONTROL 1. OPERATION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in Table 7. (Table 7 : Compressor Operation Frequency Range) Cooling Heating ABU18RULX 20Hz 63Hz 20Hz 87Hz 25Hz ABU24RULX...

  • Page 14: Timer Operation Control

    9. TIMER OPERATION CONTROL 9-1 Wireless Remote Controller (accessory parts) AR- JW5 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...
  • Page 15 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 1.8 degF (1 degC).
  • Page 16 9-2 Wired Remote Controller (optional parts) UTB- UUB 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 17 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 18: Electronic Expansion Valve Control

    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 and the outdoor temperature sensor. The pulse range of the electronic expansion valve control is between 50 to 480 pulses.

  • Page 19: Pump Down ( Refrigerant Collecting Operation )

    (Table 8 : Preheating Operation / Release Temperature) Before 24 hour After 24 hour Operation Release Operation Release temperature temperature temperature temperature ABU18RULX 37.4°F 44.6°F 32°F 39.2°F ABU24RULX (3°C) (7°C) (0°C) (4°C) ABU36RSLX 17. DEFROST OPERATION CONTROL 1.
  • Page 20 3. Defrost Flow Chart The defrosting shall proceed by the integrating operation time and outdoor heat exchanger temperature as follows. Heating operation start : Compressor ON (Not defrosted for 6 or 10 minutes) Compressor integrating operation: 45 minutes and over Outdoor temp.

  • Page 21: Manual Auto Operation

    18. MANUAL AUTO OPERATION (Using the Wireless Remote Controller) If MANUAL AUTO Button is set, the operation is controlled as shown in Table 11. If the remote control is lost or battery power dissipated, this function will work without the remote control. (Table 11 : Manual auto operation ) Auto changeover OPERATION MODE...

  • Page 22: Various Protections

    When the discharge temperature becomes lower than Temperature ,the compressor operates. (Table 12 : Discharge Temperature Over Rise Prevention Control / Release Temperature) Temperature Temperature Temperature Temperature ABU18RULX ABU24RULX 221°F (105°C) 212°F (100°C) 239°F (115°C) 176°F (80°C) ABU36RSLX 2. CURRENT RELEASE CONTROL The compressor frequency is controlled so that the outdoor unit input current does not exceeds the current limit value that was set up with the outdoor temperature.
  • Page 23 [ Cooling ] ABU18RULX Outdoor unit fan speed 780 rpm 400 rpm 250 rpm 220, 200 rpm T0 > 113°F (45°C) 8.0A / 7.5A 8.0A / 7.5A 5.0A / 4.5A 4.0A / 3.5A 113°F > T0 > 77°F 10.0A / 9.5A (45°C)
  • Page 24 3. ANTI-FREEZING CONTROL (Cooling mode) The compressor frequency decreases on cooling mode when the indoor heat exchanger temperature sensor detects the temperature lower than 37.4°F (3°C). Then, the anti-freezing control is released when it becomes higher than 42.8°F (6°C). (Fig 11 : Anti-freezing Protection Operation / Release Temperature) Indoor heat exchange temperature The compressor frequency is...

  • Page 25: Trouble Shooting

    R410A Universal Floor / Ceiling & Large Ceiling type INVERTER 2 . TROUBLE SHOOTING...

  • Page 26: Error Display

    2. TROUBLESHOOTING 2-1 ERROR DISPLAY 2-1-1 INDOOR UNIT DISPLAY 1. ERROR DISPLAY Please refer the blinking pattern as follows. Trouble Vertical Operation Timer LED Swing LED shooting Error Contents (RED) (GREEN) (ORANGE) Continuous Continuous Indoor EEPROM abnormal (Model No.) blink blink Continuous Room temperature sensor open...

  • Page 27: Outdoor Unit Display

    2-1-2 OUTDOOR UNIT DISPLAY 1. ERROR DISPLAY Display Trouble LED Flashing Error contents priority shooting Pattern Outdoor communication signal error 1 time blink (Forward transfer signal error) blink Outdoor discharge pipe temperature sensor error 2 times Outdoor heat exchanger temperature sensor error blink 3 times Outdoor temperature sensor error...

  • Page 28: Wired Remote Controller Display

    2-1-3 WIRED REMOTE CONTROLLER DISPLAY (optional parts) 1. SELF - DIAGNOSIS When the error indication "E:EE" is displayed, inspection of the air conditioning system is necessary. Please consult authoilzed servise personnel. Run [Self-Diagnosis] if [E:EE] flashes on the clock display of the remote controller. Display Error code SU MO TU WE TH FR SA...
  • Page 29 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 and the START/STOP button simultaneously for 5 seconds or more to start the self-diagnosis.

  • Page 30: Trouble Shooting With Error Code

    2-2 TROUBLE SHOOTING WITH ERROR CODE Trouble shooting 1 Indicate or Display: INDOOR UNIT Error Method: Indoor Unit : No LED Communication Error Outdoor Unit : No indication (Indoor unit Remote control) ERROR CODE : E : 00 Detective details: Detective Actuators: When the indoor unit cannot receive the signal from Wired Remote Indoor unit controller PCB circuit...
  • Page 31 Indicate or Display: Indicate or Display: Trouble shooting 2 OUTDOOR UNIT Error Method: Indoor Unit : Operation LED: 5 times blink, Timer LED: Blink, Vertical swing LED: OFF Communication Error Outdoor Unit : No indication (Serial Reverse Transfer Error) ERROR CODE : E : 01 Detective details: Detective Actuators: When the indoor unit cannot receive the serial signal from Outdoor unit...
  • Page 32 Indicate or Display: Trouble shooting 3 Indoor Unit : Operation LED: 2 times blink, Timer LED: Blink, INDOOR UNIT Error Method: INDOOR UNIT Vertical swing LED: OFF / Blink Room Temperature Sensor Error Outdoor Unit : No indication ERROR CODE : E : 02 / 03 Detective Actuators: Detective details: Indoor Unit Controller PCB Circuit...
  • Page 33 Indicate or Display: Trouble shooting 4 Indoor Unit : Operation LED: 3 times blink, Timer LED: Blink, INDOOR UNIT Error Method: INDOOR UNIT Vertical swing LED: OFF / Blink Indoor Heat Exchanger Temperature Outdoor Unit : No indication Sensor Error ERROR CODE : E : 04 / 05 Detective Actuators: Detective details:...
  • Page 34 Indicate or Display: Trouble shooting 5 Indoor Unit : Operation LED: Blink, Timer LED: 3 times blink, OUTDOOR UNIT Error Method: Vertical swing LED: OFF Outdoor Heat Exchanger Temperature Outdoor Unit : LED 3 times blink Sensor Error ERROR CODE : E : 06 Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit...
  • Page 35 Indicate or Display: Trouble shooting 6 Indoor Unit : Operation LED: Blink, Timer LED: 4 times blink, OUTDOOR UNIT Error Method: INDOOR UNIT Vertical swing LED: OFF Outdoor Temperature Sensor Error Outdoor Unit : LED 4 times blink ERROR CODE : E : 0A Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit...
  • Page 36 Indicate or Display: Trouble shooting 7 Indoor Unit : Operation LED: Blink, Timer LED: 5 times blink, OUTDOOR UNIT Error Method: INDOOR UNIT Vertical swing LED: OFF Outdoor Discharge Pipe Temperature Outdoor Unit : LED 2 times blink Sensor Error ERROR CODE : E : 0C Detective details: Detective Actuators:...
  • Page 37 Trouble shooting 8 Indicate or Display: Indicate or Display: INDOOR UNIT Error Method: Indoor Unit : Operation LED: Blink, Timer LED: Blink, Vertical swing LED: OFF Indoor EEPROM abnormal Outdoor Unit : No indication (Model No.) ERROR CODE : E : 11 Detective details: Detective Actuators: Indoor Unit Controller PCB circuit...
  • Page 38 Check Point 5 : Check Output Voltage of Control PCB Check indoor unit circuit diagram and the output voltage (between 2 (White) and 3 (Red)) of CN5. ABU18RULX : Input AC voltage (Cooling, Airflow[HIGH]) Input AC voltage (Heatling, Airflow[HIGH]) ABU24RULX : Input AC voltage (Cooling, Airflow[HIGH])
  • Page 39 Indicate or Display: Trouble shooting 10 Indicate or Display: INDOOR UNIT Error Method: Indoor Unit : Operation LED: 5 times blink, Timer LED: Blink, Vertical swing LED: Blink Outdoor Communication Signal Error (Forward Transfer Signal Error) Outdoor Unit : LED 1 time blink ERROR CODE : E : 13 Detective details: Detective Actuators:...
  • Page 40 Indicate or Display: Trouble shooting 11 Indoor Unit : Operation LED: Blink, Timer LED: 8 times blink, OUTDOOR UNIT Error Method: Vertical swing LED: OFF Compressor Temperature Sensor Error Outdoor Unit : LED 7 times blink ERROR CODE : E : 15 Detective Actuators: Detective details: When Compressor Temperature Thermistor open or short-circuit is...
  • Page 41 Indicate or Display: Trouble shooting 12 Indoor Unit : Operation LED: Blink, Timer LED: 9 times blink, OUTDOOR UNIT Error Method: INDOOR UNIT Vertical swing LED: OFF Pressure Switch Error Outdoor Unit : LED 9 times blink ERROR CODE : E : 16 Detective details: Detective Actuators: Outdoor Unit Main PCB Circuit...
  • Page 42 Indicate or Display: Trouble shooting 13 Indoor Unit : Operation LED: Blink, Timer LED: 10 times blink, OUTDOOR UNIT Error Method: Vertical swing LED: OFF IPM error (Permanent Stop) Outdoor Unit : LED 12 times blink ERROR CODE : E : 17 Detective details: Detective Actuators: When more than normal operating current to IPM in Main PCB flows,...
  • Page 43 Indicate or Display: Trouble shooting 14 Indoor Unit : Operation LED: Blink, Timer LED: 11 times blink, OUTDOOR UNIT Error Method: Vertical swing LED: OFF CT error Outdoor Unit : No indication ERROR CODE : E : 18 Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When Input Current Sensor has detected lower than 0.5A...
  • Page 44 Indicate or Display: Trouble shooting 15 Indoor Unit : Operation LED: Blink, Timer LED: 12 times blink, OUTDOOR UNIT Error Method: INDOOR UNIT Vertical swing LED: OFF Active Filter Module (AFM) error Outdoor Unit : No indication ERROR CODE : E : 19 Detective details: Detective Actuators: Outdoor Unit Main PCB Circuit...
  • Page 45 Indicate or Display: Indicate or Display: Trouble shooting 16 OUTDOOR UNIT Error Method: Indoor Unit : Operation LED: Blink, Timer LED: 13 times blink, Vertical swing LED: OFF Compressor rotor location cannot detect Outdoor Unit : LED 13 times blink (Permanent Stop) ERROR CODE : E : 1A Detective details:...
  • Page 46 Indicate or Display: Trouble shooting 17 Indoor Unit : Operation LED: Blink, Timer LED: 14 times blink, OUTDOOR UNIT Error Method: Vertical swing LED: OFF Outdoor Unit Fan Motor Error Outdoor Unit : LED 15 times blink ERROR CODE : E : 1b Detective details: Detective Actuators: When outdoor fan rotation speed is less than 100rpm in 20 seconds...
  • Page 47 Indicate or Display: Trouble shooting 18 Indoor Unit : No LED OUTDOOR UNIT Error Method: Outdoor Unit : LED 8 Times Blink Heat Sink Temperature Sensor Error ERROR CODE : No indication Detective details: Detective Actuators: When Heat Sink Temperature Thermistor open or short-circuit is Outdoor Unit Main PCB Circuit detected at power ON or while running the compressor.
  • Page 48 Indicate or Display: Trouble shooting 19 OUTDOOR UNIT Error Method: Indoor Unit : No LED Outdoor Unit : LED 14 Times Blink Compressor Start-up error (Permanent Stop) ERROR CODE : No indication Detective Actuators: Detective details: On start-up the compressor, when detected rotor position is out of phase Outdoor Unit Main PCB Circuit with actual rotor position more than 90 degrees,the compressor stops.

  • Page 49: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 20 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 50 Forecast of Cause: Trouble shooting 21 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 51 Forecast of Cause: Trouble shooting 22 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 52 Forecast of Cause: Trouble shooting 23 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 53 Forecast of Cause : Trouble shooting 24 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 54: 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 Is there open or loose connection Is there open or loose connection Check if vibration noise by loose bolt or contact noise...
  • Page 55 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) W304 MAIN PCB W305 W303 (WHITE) (WHITE) (BLACK)
  • Page 56 SERVICE PARTS INFORMATION 3 Active Filter Module Check Point 1 : Check Open or Short-circuit and Diode (D1) Remove connector, check the open or short-circuit and the diode in the module Check the open or short-circuit Terminal Resistance value Tester(+) Tester(-) 360k 720k...
  • Page 57 SERVICE PARTS INFORMATION 4 Outdoor unit Electronic Expansion Valve ( EEV ) Check Point 1 : Check Connections Check connection of connector (CN27) ( Loose connector or open cable ) EXPANSION VALVE COIL BROWN BLUE CN27 ORANGE YELLOW WHITE Check Point 2 : Check Coil of EEV Check Point 3 : Check Voltage from Main PCB.
  • Page 58 SERVICE PARTS INFORMATION 5 Indoor Unit Fan Motor Check Point : ABU18/ 24RULX Check each winding resistance of the motor If Resistance value is abnormal, replace motor. BLUE Read Wire Resistance value PURPLE White - Red PINK - Black Thermal protector 46.4 - Pink 293°F...

  • Page 59: Replacement Parts ( For Outdoor Unit )

    R410A Universal Floor / Ceiling & Large Ceiling type INVERTER 3 . REPLACEMENT PARTS...

  • Page 60: For Aou18/ 24/ 36Rlx

    1. REPLACEMENT PARTS (For OUTDOOR UNIT) 1-1 For AOU18/ 24/ 36RLX 1-1-1 PARTS LAYOUT DRAWING Active Filter Module Heat Exchanger Thermistor (Heat sink) Main PCB Fan motor Filter PCB 4-way valve Accumulator Solenoid Thermistor (Compressor temp.) Compressor Choke coil Thermistor (Discharge temp.) VIEW - A 03-01...
  • Page 61 Thermo Holder& Thermistor (Outdoor Temp.) Check valve Pressure SW AOU18 2-way valve (Liquid) Coil (Expansion valve)& AOU24/ 36 Expansion valve 3-way valve (Liquid) Thermistor (Heat exchanger temp.) 3-way valve (Gas) 03-02...

  • Page 62: Wiring

    1-1-2 WIRING (For AOU18/ 24/ 36RLX) CLAMP & BIND Thermistor (Discharge temp.) wire Thermistor (Outdoor temp.) wire Thermistor (Compressor temp.) wire Thermistor (Heat exchanger temp.) wire Coil (Expansion valve) wire Pressure SW wire CLAMP (Compressor wire) CLAMP (Fan motor wire) CLAMP (Solenoid wire) BIND...

  • Page 63: Disassembly Process

    1-1-3 DISASSEMBLY PROCESS (For AOU18/ 24/ 36RLX) 1. SERVICE PANEL removal Remove the 2 mounting screws. Remove the SERVICE PANEL by sliding downward. Replaceable Component Compressor Accumulator 4-way valve Solenoid Thermistor (Compressor temp.) Thermistor (Discharge temp.) Hook Thermistor (Outdoor temp.) (3 places) Thermistor (Heat exchanger temp.) Pressure SW...
  • Page 64 3. INVERTER BOX removal Remove the 4 mounting screws. Remove the connectors and cords. (Refer to VIEW -C,-D) Remove the INVERTER BOX upward. REAR VIEW FRONT VIEW Remove power supply & Remove the connectors Remove the connectors Connection cord. Terminal VIEW - C Choke coil VIEW - D...
  • Page 65 Remove the 1 mounting screw. Remove the INVERTER BOX COVER upward. INVERTER BOX COVER Hook (2 places) Remove the connector and cords. Twist W6 and W7 Twist W4 and W5 CN1 (Black/Brown/Red) 4 times or more. 2 times or more. W8 (Black) W9 (White) W6 (Black) W4 (Black)
  • Page 66 Remove the connector and cords. Twist 4 times or more 2 turn the Wire this way " - " (Black) " L2 " (Brown) Thermistor (Heat sink) " + " (Red) " L1 " (White) CN407 " P " (Yellow) "...
  • Page 67 Remove the 6 mounting screws. Remove the INVERTER BOX A upward. INVERTER BOX A REAR VIEW LEFT SIDE VIEW Filter PCB Main PCB Remove the 2 mounting screws. Remove the 1 mounting screw. Remove the Filter PCB upward. Remove the Main PCB upward. Hook (3 places) Hook (2 places) Main PCB...

  • Page 68: Assembly Process Of Inverter Unit

    1-1-4 ASSEMBLY PROCESS of INVERTER UNIT (For AOU18/ 24/ 36RLX) 1. FILTER PCB As shown in Fig.1, assemble FILTER PCB to INVERTER BOX A. As shown in Fig.2, pull out the wires of FILTER PCB. Hook (2 places) Screw (2 places) INVERTER BOX A FILTER PCB Fig.1...
  • Page 69 As shown in Fig.4, pull out the wires. W16 (Red) W17 (Black) Thermistor (Heat sink) W303 (Black) W304 (White) W305 (Red) CN407 Fig. 4 As shown in Fig.5, pull out the wires and fix them. Hook (2 places) W12 (Yellow) W13 (Blue) W17 (Black) W16 (Red)
  • Page 70 As shown in Fig.6, pull out the wires. W200 (Red) Fig. 6 As shown in Fig.7, pull out the wires. W200 (Red) HYIC1 CN1 wire with connector Fig. 7 Don't come in contact with HYIC1. DETAIL - A 03-11...
  • Page 71 For AOU18/ 24RLX As shown in Fig.8, connect wires. CN34 (Yellow) CN1 (White) Fig. 8 As shown in Fig.9, connect wires. Through this hole. TM101 (Black line) TM102 (White line) Fig. 9 03-12...
  • Page 72 For AOU36RLX As shown in Fig.8, connect wires. CN34 (Yellow) CN1 (White) Fig. 8 As shown in Fig.9, connect wires. W21 (Orange) W22 (Orange) PTC Thermistor Through this hole. TM101 (Black line) TM102 (White line) Fig. 9 03-13...
  • Page 73 As shown in Fig.10, fix the wire to INVERTER BOX A. Pull out the wire Thermistor (Heat sink) Hook (3 places) through this opening CN407 Fig. 10 As shown in the figures, set wire with connector and bind it to INVERTER BOX A. Bind wire to INVERTER BOX A.

  • Page 74: Replacement Parts (For Indoor Unit)

    2. REPLACEMENT PARTS (For INDOOR UNIT) 2-1 PARTS LAYOUT DRAWING ( For ABU18/ 24RULX ) 1. INTAKE GRILLE removal Open the INTAKE GRILLE and remove the 3 mounting screws. Remove the INTAKE GRILLE Machine screw Tapping screw Tapping screw INTAKE GRILLE 03-15...
  • Page 75 2. COVER PLATE (RIGHT) removal Remove the 1 mounting screw. Remove the COVER PLATE (RIGHT). COVER PLATE (RIGHT) Hook (2 places) Hook (2 places) 3. COVER PLATE (LEFT) removal Remove the 1 mounting screw. Remove the COVER PLATE (LEFT). COVER PLATE (LEFT) Hook (2 places) Hook (2 places) 03-16...
  • Page 76 4. CONTROL BOX removal Remove the 4 mounting screw. CONTROL BOX CONTROL BOX Do not remove the screws. If the stays are removed, CONTROL BOX will fall. VIEW - A Pull out the CONTROL BOX. CONTROL BOX 03-17...
  • Page 77 5. CONTROL BOX COVER removal Remove the 3 mounting screw. Remove the CONTROL BOX COVER. BASE CONTROL BOX COVER CAUTION Be careful not to pinch the lead wires between the CONTROL BOX and BASE. 03-18...
  • Page 78 6. Wiring and Parts layout BIND CLAMP (Wire with connector (For Stepping motor)) (Wire with connector (For Stepping motor)) (Thermistor (Room temp.)) (Thermistor (Pipe temp.)) Wire with connector (Wire with connector (For Display)) (For Stepping motor) BLACK WHITE GREEN WHITE WHITE BLACK BLACK...

  • Page 79: Parts Layout Drawing (For Abu36Rslx)

    2-2 PARTS LAYOUT DRAWING ( For ABU36RSLX ) AIR FILTER INTAKE GRILLE Tapping screw SIDE COVER B (LEFT) SIDE COVER A (RIGHT) SIDE COVER B (RIGHT) 1. AIR FILTER removal Remove the 2 AIR FILTERS. INTAKE GRILLE ( 2 places ) AIR FILTER ( 2 places ) 03-20...
  • Page 80 2. INTAKE GRILLE removal Remove the 6 mounting screws. Remove the 2 INTAKE GRILLES. INTAKE GRILLE ( 2 places ) 03-21...
  • Page 81 3. SIDE COVER removal Remove the 2 mounting screws.(Left side and Right side) Remove the SIDE COVER A and B. SIDE COVER A (LEFT) Hook (2 places) SIDE COVER B (LEFT) Hook (3 places) 4. CONTROL BOX removal Remove the 2 mounting screws. Pull the CONTROL BOX downward.
  • Page 82 6. Wiring and Parts layout BIND BIND (Wire with connector (For Display)) (Wire with connector (For Display)) (Thermistor (Pipe temp.)) (Thermistor (Pipe temp.)) (Wire with connector (For Stepping motor)) (Thermistor (Room temp.)) Thermistor (Room temp.) BLACK WHITE WHITE BLACK Capacitor,Plastic CONTROLLER PCB Power Supply PCB BIND...
  • Page 83 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan Apr. 2006 Printed in Japan...

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