Fujitsu ASU18RLF Service Instructions Manual
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Fujitsu ASU18RLF Service Instructions Manual

Fujitsu ASU18RLF Service Instructions Manual

Split type room air conditioner wall mounted type inverter
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See also: Service Manual , Instruction and Service Manual
SERVICE
INSTRUCTION
R410A
SPLIT TYPE
ROOM AIR CONDITIONER
WALL MOUNTED
INVERTER
Models
Indoor unit
ASU18RLF
ASU24RLF
type
Outdoor unit
AOU18RLXFW
AOU24RLXFW

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Summary of Contents for Fujitsu ASU18RLF

  • Page 1: Wall Mounted Type

    SPLIT TYPE ROOM AIR CONDITIONER WALL MOUNTED type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AOU18RLXFW ASU18RLF AOU24RLXFW ASU24RLF 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......................01-02 4. AUTO CHANGEOVER OPERATION................01-03 5. INDOOR FAN CONTROL....................01-04 6. OUTDOOR FAN CONTROL..................01-06 7. LOUVER CONTROL..................... 01-07 8. COMPRESSOR CONTROL..................01-08 9.

  • Page 3: Description Of Each Control Operation

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

  • Page 4: Cooling Operation

    However, the maximum frequency is limited in the range shown in Figure1 based on the fan speed mode and the outdoor temperature. ( Table1 : Compressor Frequency Range ) minimum maximum frequency frequency ASU18RLF 12rps 55rps ASU24RLF 16rps 72rps ( Fig.1 : Limit of Maximum Frequency based on Outdoor Temperature )

  • Page 5: Heating Operation

    * When the room temperature is between +5°F(+2.5°C) to -6°F(-3°C) of the setting temperature, the compressor frequency is controlled within the range shown in Table2. ( Table2 : Compressor Frequency Range ) minimum maximum frequency frequency ASU18RLF 14rps 67rps ASU24RLF 16rps 90rps 3. DRY OPERATION...

  • Page 6: 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, DRY and MONITORING modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 64°F(18°C) and 88°F(30°C) in 2°F(1°C) steps.

  • Page 7: Indoor Fan Control

    5. INDOOR FAN CONTROL 1. Fan speed ( Table4 : Indoor Fan Speed ) Speed (rpm) Operation mode Air flow mode ASU18RLF ASU24RLF 1260 1530 Heating 1120 1320 1020 1220 1020 Quiet Cool air prevention S-Lo Cooling/ Fan 1260 1480...
  • Page 8 5. HEATING OPERATION Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Figure4. On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow of [HEAT] operation modes QUIET, LOW, MED, HIGH, as shown in Table4.

  • Page 9: Outdoor Fan Control

    2. Fan Speed ( Table6 : Outdoor fan speed ) (rpm) Zone Cooling Heating 800/ 620/ 500/ 400 500/ 320/ 250 ASU18RLF 800/ 620/ 550/ 450 550/ 450 300/ 230/ 200 220/ 200 850/ 800/ 620/ 500/ 400 500/ 320/ 250 ASU24RLF...

  • Page 10: Louver Control

    1-5. LOUVER CONTROL 1. VERTICAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follow: (Fig.7 : Virtical Air Direction Range) <Wall Mounted Type> Cooling / Dry mode Heating mode Fan mode Vertical Louver Power Diffuser Use the air direction adjustments within the ranges shown above.

  • Page 11: Compressor Control

    8. COMPRESSOR CONTROL 1. OPEARTION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in the table8. (Table8 : Compressor Operation Frequency Range) Cooling Heating ASU18RLF 12rps 55rps 14rps 67rps 15rps 25rps...

  • Page 12: Timer Operation Control

    9. TIMER OPEARTION CONTROL The table9 shows the available timer setting based on the product model. (Table9 : Timer Setting) ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER ASU18/ 24RLF 1. OPEARTION FREQUENCY RANGE 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 13 3. SLEEP TIMER If the sleep 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 2°F(1°C).

  • Page 14: Electronic Expansion Valve Control

    Table10 : The pulse range of the electronic expansion valve control Operation mode Pulse range Cooling / Dry mode between 52 to 480 pulses. ASU18RLF Heating mode between 40 to 480 pulses. between 53 to 480 pulses. Cooling / Dry mode...

  • Page 15: Manual Auto Operation (Indoor Unit Body Operation)

    15. MANUAL AUTO OPERATION (Indoor unit body operation) If MANUAL AUTO Button is set, the operation is controlled as shown in Table11. If the remote control is lost or battery power dissipated, this function will work without the remote control. (Table11) Manual auto operation Forced cooling operation...

  • Page 16: Defrost Operation Control

    20. DEFROST OPERATION CONTROL 1. CONDITION OF STARTING THE DEFROST OPERATION The defrost operation starts as shown in the following Table 14, 15, and 16. ( Table 14 : Condition of 1st defrost operation) Compressor integrating operation time 1st defrost Less than 22 minutes More than 22 minutes More than 62 minutes...
  • Page 17 3. Defrost Flow Chart The defrosting shall proceed by the integrating operation time, outdoor temperature and outdoor heat exchanger temperature as follows. Heating operation start : Compressor ON (Not defrosted for 10 minutes) Integrating defrost 1st defrost 2nd and later defrost (Constant monitoring) Compressor Compressor...

  • Page 18: Off Defrost Operation Control

    21. OFF DEFROST OPEARTION 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 19: Various Protections

    The compressor frequency returns to the designated frequency of the indoor unit at the time when the frequency becomes lower than the release value. (Table20 : Current Release Operation Value / Release Value) [ Heating ] ASU18RLF ASU24RLF OT (Control / Release) OT (Control / Release) 10.0A/ 9.5A...
  • Page 20 3. ANTIFREEZING CONTROL (Cooling and Dry mode) The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger temperature sensor detects the temperature lower than Temperature . Then, the anti-freezing control is released when it becomes higher than Temperature . (Table21 : Anti-freezing Protection Operation / Release Temperature) Outdoor temperature Temperature...

  • Page 21: Trouble Shooting

    R410A WALL MOUNTED type INVERTER 2 . TROUBLE SHOOTING...

  • Page 22: Error Display

    2-1 ERROR DISPLAY 2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY Please refer the flashing pattern as follows. Indoor Unit : ASU18RLF / 24RLF The OPERATION, TIMER, ECONOMY lamps operate as follows according to the error contents. Indoor Unit Display...

  • Page 23: Wired Remote Controller Display

    2-1-2 WIRED REMOTE CONTROLLER DISPLAY (OPTION) 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 MOTU WETH FR SA ex.

  • Page 24: Trouble Shooting With Error Code

    2-2 TROUBLE SHOOTING WITH ERROR CODE Trouble shooting 1 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Serial Communication Error (Serial Reverse Transfer Error) Detective Actuators: Detective details: When the indoor unit cannot receive the serial signal from Outdoor unit Outdoor unit Main PCB more than 2minutes after power ON, or the indoor unit cannot receive Outdoor unit Fan motor...
  • Page 25 Trouble shooting 2 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Serial Communication Error (Serial Forward Transfer Error) Detective Actuators: Detective details: When the outdoor unit cannot properly receive the serial signal from Indoor unit Controller PCB indoor unit for 10 seconds or more.
  • Page 26 Trouble shooting 3 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Wired Remote Controller Communication Error Detective Actuators: Detective details: Indoor unit Controller PCB When the indoor unit cannot properly receive the signal from Wired Remote Controller (Option) Wired Remote Controller for 1 minute or more.
  • Page 27 Trouble shooting 4 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Unit Model Information Error EEPROM Access Abnormal Detective details: Detective Actuators: When power is on and there is some below case. Indoor unit Controller PCB 1.
  • Page 28 Indicate or Display: Trouble shooting 5 INDOOR UNIT Error Method: Refer to error code table. Manual Auto Switch Error Detective Actuators: Detective details: Indoor Unit Controller PCB When the Manual Auto Switch becomes ON for consecutive 30 or Indicator PCB more seconds.
  • Page 29 Trouble shooting 6 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Room Thermistor Error Detective details: Detective Actuators: Indoor Unit Controller PCB Circuit Indoor unit thermistor is open or short is detected always. Indoor Temperature Thermistor Forecast of Cause : 1.
  • Page 30 Trouble shooting 7 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Heat Ex. Thermistor Error Detective Actuators: Detective details: Indoor Unit Controller PCB Indoor unit thermistor is open or short is detected always. Heat Exchanger (MID) Thermistor Forecast of Cause : 1.
  • Page 31 Trouble shooting 8 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Unit Fan Motor Error Detective Actuators: Detective details: Indoor unit Controller PCB When the condition that actual frequency of Indoor Fan is below 1/3 of target frequency is continued more than 56 seconds. Indoor unit fan motor Forecast of Cause: 1.
  • Page 32 Trouble shooting 9 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. A.F Voltage Error Detective Actuators: Detective details: Outdoor unit Main PCB When inverter input DC voltage is higher than 425V or Active filter module lower than 80V. When a momentary power cut off occurred on low voltage Forecast of Cause : 1.
  • Page 33 Trouble shooting 10 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. IPM Error Detective details: Detective Actuators: When more than normal operating current to IPM in Main PCB flows, Outdoor unit Main PCB the compressor stops. Compressor After the compressor restarts, if the same operation is repeated within 40sec, the compressor stops again.
  • Page 34 Trouble shooting 11 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge Thermistor Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Discharge Pipe Temperature Thermistor open or short-circuit Discharge Pipe Temperature Thermistor is detected at power ON or while running the compressor. Forecast of Cause : 1.
  • Page 35 Trouble shooting 12 Indicate or Display: OUTDOOR UNIT Error Method: Compressor Thermistor Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Compressor Temperature Thermistor open or short-circuit Compressor Temperature Thermistor is detected at power ON or while running the compressor. Forecast of Cause : 1.
  • Page 36 Trouble shooting 13 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Heat Ex. Liquid Outlet Thermistor Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Heat Exchanger Temperature Thermistor (Out) open or Heat Exchanger Temperature Thermistor short-circuit is detected at power ON or while running the compressor.
  • Page 37 Trouble shooting 14 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Thermistor Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Outdoor Temperature Thermistor open or short-circuit Outdoor Temperature Thermistor is detected at power ON or while running the compressor. Forecast of Cause : 1.
  • Page 38 Trouble shooting 15 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Current Sensor Error Detective details: Detective Actuators: When Input Current Sensor has detected 0A, while Inverter Compressor is Outdoor unit Main PCB operating at higher than 56rps, after 1minute upon starting the Compressor. (Except during the defrost operation) Forecast of Cause : 1.
  • Page 39 Trouble shooting 16 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Over Current Error Detective details: Detective Actuators: "Protection stop by overcurrent generation after inverter compressor start Outdoor unit Main PCB processing completed'' generated consecutively 10 times. Compressor * The number of generations is reset if the start-up of Transistor PCB...
  • Page 40 Trouble shooting 17 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor Control Error Detective details: Detective Actuators: While running the compressor, if the detected rotor location is out of Outdoor unit Main PCB phase with actual rotor location more than 90°, Compressor the compressor stops.

  • Page 41: Outdoor Unit Fan Motor Error

    Trouble shooting 18 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Unit Fan Motor Error Detective Actuators: Detective details: When outdoor fan rotation speed is less than 100rpm in 20 seconds Outdoor unit Main PCB after fan motor starts, fan motor stops.
  • Page 42 Trouble shooting 19 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. 4-Way Valve Error 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 43 Trouble shooting 20 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge Temp. Error Detective details: Detective Actuators: "Protection stop by "discharge temperature 239degF during compressor Discharge temperature thermistor operation'''' generated 2 times within 24 hours. Forecast of Cause : 1.

  • Page 44: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 21 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 45 Forecast of Cause: Trouble shooting 22 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 46 Forecast of Cause: Trouble shooting 23 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, check if there is an open cable connection.
  • Page 47 Forecast of Cause: Trouble shooting 24 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 48 Forecast of Cause : Trouble shooting 25 1. Abnormal installation (Indoor/ Outdoor) Abnormal Noise 2. Fan failure (Indoor/ Outdoor) 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 49: 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 50 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check Connection Check terminal connection of Compressor (loose or incorrect wiring) (WHITE) (BLACK) IPM PCB TM305 TM304 TM303 Inverter PCB BLACK WHITE Compressor (RED) Check Point 2 : Check Winding Resistance Check winding resistance of each terminal If the resistance value is 0 or infinite, replace Compressor.
  • Page 51 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 BLUE ORANGE CN700 YELLOW WHITE Check Point 2 : Check Coil of EEV Check Point 3 : Check Voltage from Main PCB.
  • Page 52 SERVICE PARTS INFORMATION 4 Indoor unit fan motor Check Point 1 : Check rotation of Fan 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.
  • Page 53 SERVICE PARTS INFORMATION 6 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(-) (+IN) ( IN)
  • Page 54 SERVICE PARTS INFORMATION 7 Mounted on Transistor PCB) Check Point 1 Disconnect the connection wires between the Transistor PCB - Capacitor PCB and Transistor PCB - Inverter Compressor. Set the tester to the "Resistance" mode, and measure the resistance between the following terminals. TM301 (P) - TM305(U) / TM304(V) / TM303(W) TM302 (N) - TM305(U) / TM304(V) / TM303(W) Judge the result of...

  • Page 55: Appending Data

    R410A WALL MOUNTED type INVERTER 3 . APPENDING DATA FUNCTION SETTING OUTDOOR UNIT PRESSURE VALUE AND TOTAL ELECTRIC CURRENT CURVE THERMISTOR RESISTANCE VALUES...
  • Page 56 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 57 1-4. Setting the Auto Restart Enable or disable automatic system restart after a power outage. Factory setting) Setting Description Function Number Setting Value 1-5. Setting the Indoor room temperature sensor switching function (Only for Wired remote controller) The following settings are needed when use the control by Wired remote controller temperature sensor.
  • Page 58 3-1-2 PROCEDURSE TO CHANGE THE FUNCTION SETTING FOR WIRELESS RC This procedure changes to the function settings used to control the indoor unit according to the installation conditions. Incorrect settings can cause the indoor unit malfunction. After the power is turned on, perform the "FUNCTION SETTING" according to the installation conditions using the remote controller.
  • Page 59 Custom code setting for remote controller (1) Press the MODE button for more then 5 seconds. (2) Press the SET TEMP. ( ) buttons to change the signal code between Match the code on the display to the air conditioner signal code. (initially set to (3) Press the MODE button.

  • Page 60: Outdoor Unit Pressure Value And Total Electric Current Curve

    3-2. OUTDOOR UNIT PRESSURE VALUE AND TOTAL ELECTRIC CURRENT CURVE Outdoor Unit Low Pressure Value and Outdoor Total Electric Current Curve (Cooling) Model Name : ASU24RLF [Condition] Ambient Indoor / Outdoor - Same temperature temperature Refrigerant Standard amount amount Piping 7.5m (Height difference 1m) length Power...
  • Page 61 Outdoor Unit High Pressure Value and Outdoor Total Electric Current Curve (Heating) Model Name : ASU24RLF [Condition] Ambient Indoor 59 °F, 68°F, 73.4°F , Outdoor 35.6 °F, 44.6°F, 53.6°F temperature (15 °C , 20 °C , 23 °C) (2 °C , 7 °C , 12 °C) Refrigerant Standard amount amount...
  • Page 62 Outdoor Unit Low Pressure Value and Outdoor Total Electric Current Curve (Cooling) Model Name : ASU18RLF [Condition] Ambient Indoor / Outdoor - Same temperature temperature Refrigerant Standard amount amount Piping 7.5m (Height difference 1m) length Power 60Hz - 230V voltage...
  • Page 63 Outdoor Unit High Pressure Value and Outdoor Total Electric Current Curve (Heating) Model Name : ASU18RLF [Condition] Ambient Indoor 59 °F, 68°F, 73.4°F , Outdoor 35.6 °F, 44.6°F, 53.6°F temperature (15 °C , 20 °C , 23 °C) (2 °C , 7 °C , 12 °C)
  • Page 64 Thermistor resistance values Room temperature thermistor Indoor heat exchanger thermistor Characteristics of room temperature thermistor Tempe F Tempe C Resistance(K ) Voltage(V) Tempe F Tempe C Resistance(K ) Voltage(V) 40.00 32.0 33.62 1.15 32.0 176.03 1.10 35.00 41.0 25.93 1.39 41.0 134.23 1.36...
  • Page 65 Outdoor Temprature thermistor Outdoor heat exchanger thermistor Characteristics of heat exchanger thermistor (Outdoor) Tempe F Tempe C Resistance(K ) Voltage(V) Tempe F Tempe C Resistance(K ) Voltage(V) 100.00 -22.0 -30.0 181.60 0.87 -22.0 -30.0 88.42 0.254 -13.0 -25.0 64.89 0.341 -13.0 -25.0 133.30...
  • Page 66 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan Jan. 2011 Printed in Japan...

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