Toshiba RAS-M07N4KVRG-E Service Manual
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Toshiba RAS-M07N4KVRG-E Service Manual

Air-conditioner multiple type
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FILE NO. SVM-22064-1
SERVICE MANUAL
MULTIPLE TYPE
RAS-M07N4KVRG-E
R32 or R410A
Revised on Aug, 2022

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Summary of Contents for Toshiba RAS-M07N4KVRG-E

  • Page 1 FILE NO. SVM-22064-1 SERVICE MANUAL MULTIPLE TYPE RAS-M07N4KVRG-E R32 or R410A Revised on Aug, 2022...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................6 3. REFRIGERANT R32 ................. 7 4. CONSTRUCTION VIEWS ................ 15 5. WIRING DIAGRAM .................. 16 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 17 7. REFRIGERANT CYCLE DIAGRAM ............18 8. CONTROL BLOCK DIAGRAM ..............19 9.

  • Page 3: Safety Precautions

    1. SAFETY PRECAUTIONS Read the precautions in this manual This appliance is fi lled with R32. carefully before operating the unit. (Flammable Material) Information included in the Operation Service personnel should be handing this equipment Manual and/or Installation Manual. with reference to the Installation Manual. Warning Indications on the Air Conditioner Unit Warning indication Description...
  • Page 4 DANGER • ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO IN- STALL/MAINTAIN THE AIR CONDITIONER. INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKAGE, ELECTRIC SHOCK OR FIRE. • TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE ALL POWER SWITCHES ARE OFF.
  • Page 5 For R32 model, use pipes, fl are nut and tools which is specifi ed for R32 refrigerant. Using of existing (R22) • piping, fl are nut and tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly result in explosion and injury.

  • Page 6: Specifications

    Outdoor (Cooling / Heating) Installation plate Accessory Indoor unit Wireless remote controller Batteries Remote controller holder Toshiba Ultra pure filter Mounting screw 6(  4x25L) Remote controller holder 2(  3.1x16L) Flat head wood screw Installation manual Owner's manual *1 : Refer to the service manual of the multi outdoor unit to be combined.

  • Page 7: Refrigerant R32

    3. REFRIGERANT R32 3. If a refrigeration gas leakage occurs during This air conditioner adopts the new refrigerant HFC (R32) which does not damage the ozone layer. installation/servicing, be sure to ventilate fully. If the refrigerant gas comes into contact with fire, a The next section describes the precautions for air conditioner using the new refrigerant.
  • Page 8 Table 3-2-1 Thicknesses of annealed copper pipes Thickness (mm) Nominal diameter Outer diameter (mm) R32(R410A) 6.35 0.80 0.80 9.52 0.80 0.80 12.70 0.80 0.80 15.88 1.00 1.00 2. Joints For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) Flare Joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm.
  • Page 9 d) Flare Processing Make certain that a clamp bar and copper pipe have been cleaned. ØD By means of the clamp bar, perform the flare processing correctly. Use either a flare tool for R32 or conven- tional flare tool. Flare processing dimensions differ according to the type of flare tool.
  • Page 10 Table 3-2-6 Flare and flare nut dimensions for R22 Dimension (mm) Nominal Outer diameter Thickness Flare nut width diameter (mm) (mm) (mm) 6.35 9.52 13.0 13.5 12.70 16.2 16.0 12.9 15.88 19.7 19.0 16.0 19.05 23.3 24.0 19.2 Fig. 3-2-2 Relations between flare nut and flare seal surface 2.
  • Page 11 3-3. Tools 3-3-1. Required Tools The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R32 is changed to prevent mixing of other refrigerant. To reinforce the pressure-resisting strength, flare processing dimensions and opposite side dimension of flare nut (For Ø12.7 copper pipe) of the refrigerant piping are lengthened.
  • Page 12 3-4. Recharging of Refrigerant When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps. Recover the refrigerant, and check no refrigerant remains in the equipment. When the compound gauge’s pointer has indicated –0.1 Mpa (–76 cmHg), place the handle Low in the fully closed position, and turn off the vacuum pump’s power switch.
  • Page 13 3-5. Brazing of Pipes 3. Types of flux 3-5-1. Materials for Brazing • Noncorrosive flux 1. Silver brazing filler Generally, it is a compound of borax and boric Silver brazing filler is an alloy mainly composed acid. of silver and copper. It is used to join iron, copper It is effective in case where the brazing tem- or copper alloy, and is relatively expensive though perature is higher than 800°C.
  • Page 14 3-5-3. Brazing As brazing work requires sophisticated techniques, experiences based upon a theoretical knowledge, it must be performed by a person qualified. Flow meter In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to Stop valve proceed with brazing while letting dry Nitrogen gas (N2) flow.

  • Page 15: Construction Views

    4. CONSTRUCTION VIEWS 4-1. Indoor Unit Grille inlet Air filter Air filter Air outlet Plasma ion Wireless adapter Heat exchanger Front panel Installation plate hanger Wireless remote controller Remote controller holder Drain hose (0.4m) Installation plate hanger Installation plate hanger Connecting pipe (0.36m) Connecting pipe (0.40m) (Flare...

  • Page 16: Wiring Diagram

    5. WIRING DIAGRAM - 16 -...

  • Page 17: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS Indoor Unit Parts name Type name Specifications Fan Motor (for indoor) ICF-340-30-6 DC280-340V, 42W Room temp. sensor (TA-sensor) 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) 10kΩ at 25°C Heat exchanger temp. sensor (TCJ-sensor) 10kΩ at 25°C Louver motor 24BYJ48-ST, MSBPC20F04 Output (Rated) 4 phase, DC12V...

  • Page 18: Refrigerant Cycle Diagram

    Outer dia. : 6.35mm Thickness : 0.8mm Sectional shape of heat insulator To outdoor unit To outdoor unit Dimension table Outer diameter of refrigerant pipe (mm) Indoor unit   Gas side Liquid side 9.52 RAS-M07N4KVRG-E 6.35 - 18 -...

  • Page 19: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM Indoor Unit Indoor Unit Control Panel M.C.U Operation Functions Display Heat Exchanger Sensor • Louver Control Timer • 3-minute Delay at Restart for Compressor Display Temperature Sensor PURE • Motor Revolution Control Display • Processing Infrared Rays Signal Receiver (Temperature Processing) Display •...

  • Page 20: Operation Description

    9. OPERATION DESCRIPTION 9-1. Outline of Air Conditioner Control 2. Contents of operation command signal (Serial signal) from indoor unit controller to This air conditioner is a capacity-variable type air conditioner. Its system can control the speed of outdoor unit controller compressor motor according to load.
  • Page 21 9-2. Operation Description 1. Basic operation ......................1. Operation control ..................... 2. Cooling/Heating operation ..................3. AUTO operation ....................... 4. DRY operation ......................2. Indoor fan motor control ....................Capacity control ......................Release protective control by temperature of indoor heat exchanger ......Louver control .......................

  • Page 22: Basic Operation

    Item Operation flow and applicable data, etc. Description 1. Basic 1. Operation control operation Receiving the user’s operation condition setup, the operation statuses of indoor/outdoor units are controlled. 1) The operation conditions are selected by the remote controller as shown in the below. 2) A signal is sent by ON button of the remote controller.

  • Page 23: Cooling/Heating Operation

    Item Operation flow and applicable data, etc. Description 1. Basic 2. Cooling/Heating operation operation The operations are performed in the following parts by controls according to cooling/heating conditions. 1) Receiving the operation ON signal of the remote controller, the cooling or heating operation signal starts being transferred form the indoor controller to the outdoor unit.

  • Page 24: Indoor Fan Motor Control

    Item Operation flow and applicable data, etc. Description 2. Indoor fan <In cooling operation> motor control (This operation controls the fan speed at indoor unit side.) * Symbols The indoor fan (cross flow fan) is operated by the phase- : Ultra High control induction motor.
  • Page 25 Item Operation flow and applicable data, etc. Description 2. Indoor fan <In heating operation> 1) When setting the fan speed to L, motor control L+, M, M+ or H on the remote controller, the operation is per- formed with the constant speed HEAT ON shown in Fig.

  • Page 26: Capacity Control

    Item Operation flow and applicable data, etc. Description 3. Capacity The cooling or heating capacity depending on the load is 1) The difference between set control adjusted. temperature on remote controller (Ts) and room temperature (Ta) According to difference between the setup value of tempera- is calculated.

  • Page 27: Release Protective Control By Temperature Of Indoor Heat Exchanger

    Item Operation flow and applicable data, etc. Description 4. Release protective <In cooling/dry operation> 1) When temperature of the indoor control by tempera- heat exchanger drops below 5°C, (Prevent-freezing control for indoor heat exchanger) ture of indoor heat the compressor speed is In cooling/dry operation, the sensor of indoor heat exchanger reduced.

  • Page 28: Louver Control

    Item Operation flow and applicable data, etc. Description 5. Louver control This function controls the air direction of the indoor unit. 1) Louver • The position is automatically controlled according to the operation position mode (COOL/HEAT). • The set louver position is stored in memory by the microcomputer, and the louver returns to the stored position when the next operation is performed.

  • Page 29: Swing

    Item Operation flow and applicable data, etc. Description Louver control 3) Swing • Swing operation is perfor in range 35° with the Fixed position as • Swing the center. When pressing [SWING] button during • If the swing range exceeded either upper or lower limit position, operation, the louver swing operation is perfomed in range 35°...

  • Page 30: Eco Operation

    Item Operation flow and applicable data, etc. Description 6. ECO [ECO] Feature set from MENU button. <Cooling operation> operation <Cooling operation> 1) The control target temperature This function operates the air conditioner with the difference increase 0.5ºC per hour up to 2ºC between the set and the room temperature as shown in the starting from the set temperature following figure.

  • Page 31: Temporary Operation

    Item Operation flow and applicable data, etc. Description 7. Temporary Pressing [RESET] button starts the temporary 1) When pressing [RESET] button, the operation operation of [AUTO] operation. When keeping temporary [AUTO] operation starts. [RESET] button pressed for 10 seconds or more, the 2) When keeping [RESET] button pressed temporary [COOL] operation is performed.

  • Page 32: Ionizer Control [Detection Of Abnormality]

    Item Operation flow and applicable data, etc. Description 1. Purpose 9. Ionizer control [Detection of abnormality] The Ionizer function control diagram is shown in the left hand side for the purpose of telling the user when the Ionizer is malfunction. Start 2.

  • Page 33: Self-Cleaning Function

    Item Operation flow and applicable data, etc. Description 10. Self-Cleaning 1. Purpose function The Self-Cleaning operation is to minimize the growth of mold, bacteria etc. by running the fan and drying so as to keep the inside of the air conditioner clean. Unit now performing cooling or dry operation Self-Cleaning operation When the cooling or dry operation shuts...
  • Page 34 Item Operation flow and applicable data, etc. Description 10. Self-Cleaning function 10-1-1. Self-Cleaning diagram Operation display FCU fan rpm is depend on presetting. (500RPM) FCU louver OPEN OPEN (12.7º) CLOSE ON or OFF ON or OFF Timer display depend on presetting of timer function. depend on presetting of timer function.

  • Page 35: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description 1. Purpose 11. Remote-A or B Setting the remote controller This operation is to operate only one selection To separate using of remote control for each indoor indoor unit using one remote controller. unit in case of 2 air conditioner are installed nearly.

  • Page 36: Power Selection Mode

    Item Operation flow and applicable data,etc Description To automatically control room temperature to 1. Purpose 13. POWER save energy (except in DRY and FAN ONLY Selection The function is used when its circuit Mode mode) breaker is shared with other electrical −...

  • Page 37: Fireplace Operation

    Item Operation flow and applicable data,etc Description 15. Fireplace Fireplace 1: Keep air circulation during other heat Operation Cancel cold draft prevention control and fan source applied. speed depend on user require base on basic Note: control. • With Fireplace operation on Fireplace 2: heating mode indoor unit always Cold draft prevention control is active with...

  • Page 38: Display Lamp Brightness Adjustment

    Item Operation flow and applicable data, etc. Description 18. Display lamp To decrease the display lamp brightness or turn it off. brightness Press and hold for 3 seconds until brightness level ( adjustment ) is shown on remote control LCD then release the button. 2.

  • Page 39: Auto Restart Function

    9-3. Auto Restart Function This indoor unit is equipped with an automatic restarting function which allows the unit to restart operating with the set operating conditions in the event of a power supply being accidentally shut down. The operation will resume without warning three minutes after power is restored. This function is not set to work when shipped from the factory.

  • Page 40: How To Set The Auto Restart Function

    9-3-2. How to Set the Auto Restart Function To set the auto restart function, proceed as follows: The power supply to the unit must be on ; the function will not set if the power is off. Press the [RESET] button located in the center of the front panel continuously for three seconds. The unit receives the signal and beeps three times.

  • Page 41: Parts Name Of Remote Controller

    9-4. Remote control 9-4-1. Parts Name of Remote Controller 1 Infrared signal emitter 2 Start/Stop button 3 Mode select button 4 Temperature button 5 Fan speed button 6 Menu select button 7 Set louver Up-Down button 8 Set louver Left-Right button 9 Check button* MODE *Check button under battery cover...
  • Page 42 Louver Swing and HADA Care Flow Operation Setting 5. MENU SETUP 1. Press MENU button for enter menu selection For select more setting of Air conditioner such as Louver select MENU Hi Power, OFF Timer and other use MENU button. MENU Blink °C...
  • Page 43 Hi-P SILENT OPERATION (Outdoor Unit) Hi POWER OPERATION To automatically control room temperature and airflow for faster cooling or Keep outdoor unit operating silently to ensure either yourself or neighborhood heating operation (except in DRY and FAN ONLY mode) will have a tight sleep in nighttime. By this feature, the heating capacity will be optimized to deliver such silent experience.
  • Page 44 FIREPLACE OPERATION TIMER OFF OPERATION Keep indoor unit’s fan blowing continuously during thermo off, to circulate To set the timer OFF when the air conditioner is operating. heat from other sources over the room. There are three setting parameters: 1. Press MENU button for enter menu setting and press TEMP. button to Default setting >...
  • Page 45 PURE 6. MANUAL DEFORST OPERATION PLASMA ION OPERATION To defrosting the heat exchanger of the outdoor unit during Heating operation Capture efficiency of floating impurities in the air is accelerated by plasma ion Press and hold : for 5 seconds , then remote control display will MENU contaminates such as bacteria, odor, smoke, dust and virus are caught and show...
  • Page 46 Android : Version 5.0 or later. About Toshiba Home AC Control 1. Toshiba Home AC Control can control AC operation by Smartphone or tablet (mobile device) via internet connection. 2. Everywhere control, control software run on Cloud system and mobile device can set and monitor AC operation via internet connection.
  • Page 47 Open application and select Log in. Enter user name and Login successful. password. Add Wireless adapter for control by Toshiba Home AC Control application. Wireless adapter Built-in Active Wireless adapter by remote controller and Auto login. Select “Add AC (Adapter)” from both display above.
  • Page 48 Add Wireless adapter for control by Toshiba Home AC Control application. AC (adapter) connect Active Wireless adapter by Remote controller Press and hold MODE button 5 seconds Wireless LED mark will blink MODE when AP mode active M EN WPS mode...
  • Page 49 Toshiba Home AC Control application Home screen Weekly schedule Setting Menu Add AC Sub menu all AC All AC On/Off · Add Group · Delete Group Group AC On/Off · Operation Setting Each AC On/Off Sub menu group · Select AC ·...
  • Page 50 Mode and Condition setting. Enter operation mode of All AC Enter operation mode of Group AC Enter operation mode of each AC Mode select for Toshiba Home AC Control application. Provide for 5 operation modes Auto Cool Heat Fan only...
  • Page 51 Setting in operation mode. Tab for select AC Weekly schedule OFF-ON timer set 0.5-12hrs. Mode select OFF-ON Timer set Temperature set Indoor temperature Outdoor temperature ON timer set from Off mode only Fan speed set Louver set Special feature Off mode - 51 -...
  • Page 52 Group operation. Maximum 3 groups 1 Group maximum = 10 units. Add group Add AC in group Delete AC in group Please make sure Factory Reset is performed before deleting AC from mobile application. (See owner manual ʺPress and hold MODE button on remote control for 5 second and active dL functionʺ) M M OD...
  • Page 53 Weekly schedule set. Day select Monday - Sunday Weekly schedule of all AC unit Weekly schedule of all AC unit Time select Weekly schedule set for each unit Mode select Select program for active by tick at select box Weekly schedule cancel. Weekly schedule not set Weekly schedule...
  • Page 54 Energy monitoring Select Room for Energy monitoring Select Energy monitoring Energy monitoring display Set cost calculate and currency Select Energy monitoring display Export data and send by Email ● The power consumption displayed is just an estimate as it is calculated simply. It may sometimes differ from the result measured by the power meter.
  • Page 55 In case of have some problem can check from Help menu. Note : ‘‘ The Wireless Adapter must be installed, maintained, repaired and removed by a qualified installer or qualified service person.” ‘‘Contact dealer and/or service center when equipment is malfunction.” - 55 -...

  • Page 56: Name And Functions Of Indications On Remote Controller

    9-4-3. Name and Functions of Indications on Remote Controller [Display] All indications, except for the clock time indicator, are displayed by pressing the button. Transmission mark Hi-POWER indicator Indicates when the Hi-POWER operation starts. This transmission mark indicates when the remote controller transmits signals to the indoor unit.

  • Page 57: Installation Procedure

    10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left and bottom left piping Wall Hook Mounting screw Hook Cut out a piece of SPACER from indoor unit Installation packaging box, roll it and insert between plate the indoor unit and wall to tilt the indoor unit for better operation.
  • Page 58 Installation plate × 1 Wireless remote control × 1 Battery × 2 Remote control holder × 1 Toshiba Ultra pure fi lter × 2 Mounting screw × 10 Flat head wood screw × 2 Screw × 2 Owner’s Manual × 1 Installation Manual ×...
  • Page 59 10-2-3. Installation/Servicing Tools Changes in the product and components In the case of an air conditioner using R32, in order to prevent any other refrigerant from being charged accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2 UNF 20 threads per inch) •...
  • Page 60 10-3. Indoor Unit 10-3-2. Cutting a hole and mounting installation 10-3-1. Installation place <Cutting a hole> • A place which provides the spaces around the indoor When installing the refrigerant pipes from the rear. unit as shown in the diagram •...
  • Page 61 NOTE: CAUTION • Secure four corners and lower parts of the • If have curtain rails, window cornice or other installation plate with 4 to 6 mounting screws to objects, allow space from the indoor unit should be install it. 65 mm or more.
  • Page 62 <How to cutting the Front panel> <How to install the air inlet grille on the indoor unit> • To connect piping to the bottom side, the Front • When attaching the air inlet grille, the contrary panel must be cut off. of the removed operation is performed.
  • Page 63 <How to remove the drain cap> <How to remove the drain hose> • Clip the drain cap by needle-nose pliers and • Removed fixing screw of LED set then pull out it pull out. from the main body. • Removed 2 screws to fix drain pan then secure remove the drain pan from the main body.
  • Page 64 10-3-5. Indoor unit fixing <Left-hand connection with piping> 1. Pass the pipe through the hole in the wall, and hook Bend the connecting pipe so that it is laid within 43 the indoor unit on the installation plate at the upper mm above the wall surface.
  • Page 65 10-3-6. Drainage CAUTION 1. Run the drain hose sloped downwards. MOUNTING INDOOR UNIT TO THE INSTALLATION PLATE • The lower part of indoor unit may float, due to the NOTE condition of piping and installer cannot fix it to the installation plate.
  • Page 66 10-4. Others 4. Press [MODE] during pushing [CHECK]. “B” will show on the display and “00” will disappear 10-4-1 . Gas leak test and the air conditioner will turn OFF. The Remote Control B is memorized (Picture 2). Check places for indoor unit (Flarenut connection) Note : 1.
  • Page 67 10-4-5. Decorative Fabric Installation NOTE : • The tightness of the fabric depends on • The decorative fabric for cover on the air inlet grille attaching the hook and loop of Velcro around of indoor unit was put in the accessories. User can the air inlet grille, take appropriate action.

  • Page 68: How To Diagnose The Trouble

    11. HOW TO DIAGNOSE THE TROUBLE 11-1. First Confirmation 11-1-1. Confirmation of Power Supply Confirm that the power breaker operates (ON) normally. 11-1-2. Confirmation of Power Voltage Confirm that power voltage is AC 220–230–240 ± 10%. If power voltage is not in this range, the unit may not operate normally. 11-1-3.
  • Page 69 11-2. Primary Judgment To diagnose the troubles, use the following methods. 1) Judgment by flashing LED of indoor unit 2) Self-diagnosis by service check remote controller 3) Judgment of trouble by every symptom Firstly use the method 1) for diagnosis. Then, use the method 2) or 3) to diagnose the details of troubles. 11-3.
  • Page 70 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-4-1, execute the self-diagnosis by the remote controller. 2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condition and indicates the in formation of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 71 11-4-2. Caution at Servicing 1. After using the service mode of remote controller finished, press the [ ] button to reset the remote controller to normal function. 2. After finished the diagnosis by the remote controller, turn OFF power supply and turn its ON again to reset the air conditioner to normal operation.
  • Page 72 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Serial signal 1) Defective wiring of the Indoor unit Flashes when 1) to 3) The outdoor unit never and connecting connecting cable or operates...
  • Page 73 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Outdoor P.C. Current on inverter circuit All OFF Flashes after 1. Remove connecting lead wire of the board is over limit in short time.
  • Page 74 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Outdoor P.C. Compressor drive output error. All OFF Flashes after 1. Check installation conditions such as board (Relation of voltage, current error is detected packed valve opening, refrigerant 8 times*.
  • Page 75 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status Compressor does not rotate. All OFF Flashes after 1. Remove connecting lead wire of the The others (including Because of missed wiring, error is detected compressor, and operate again.
  • Page 76 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status The others Return signal of the outdoor Indoor unit Flashes when 1. . Check power supply (Rate +10%) (including operates error is detected...
  • Page 77 11-5. Judgment of Trouble by Every Symptom 11-5-1. Indoor Unit (Including Remote Controller) (1) Power is not turned on (Does not operate entirely) <Primary check> 1. Is the supply voltage normal? 2. Is the normal voltage provided to the outdoor unit? 3.
  • Page 78 (2) Power is not turned on though Indoor P.C. board is replaced <Confirmation procedure> Turn on power supply. Return the wiring of the power relay is returned to Is it wired as shown in Figure below? Does operation lamp flash? the normal procedure.
  • Page 79 (3) Only the indoor motor fan does not operate <Primary check> 1. Is it possible to detect the power supply voltage (AC220–240V) between on the terminal block? 2. Does the indoor fan motor operate in cooling operation? (In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned on, to prevent a cold air from blowing in.) Turn off power supply once, and...
  • Page 80 Is it possible to Does check display Replace change airflow level remote on remote show high? to “HIGH”? Change the new PC Replace board. Does fan speed motor change? Fan motor operates normally. Is it possible to Does check cross-flow Replace bearing rotate cross-flow fan by fan bearing normal...
  • Page 81 (4) Indoor fan motor automatically starts to rotate by turning on power supply [For DC fan motor] <Cause> The IC is built in the indoor fan motor. Therefore the P.C. board is also mounted to inside of the motor. If the P.C. board is soldered imperfectly or the IC is defective, the fan motor may automatically rotate by turning on power supply.
  • Page 82 (5) Troubleshooting for remote controller <Primary check> Check that A or B selected on the main unit is matched with A or B selected on the remote controller. There is no beep from the indoor unit Push the [ ] button. The OPERATION lamp of the air conditioner main unit does not light Does the transmission...
  • Page 83 11-6. How to Check Simply the Main Parts 11-6-1. How to Check the P.C. Board (Indoor Unit) (1) Operating precautions 1) When removing the front panel or the P .C. board, be sure to shut off the power supply breaker. 2) When removing the P .C.
  • Page 84 (3) Check procedures Table 11-6-1 Procedure Check points Causes Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the and remove the P.C. board is blown. indoor fan motor short-circuited. assembly from electronic parts base.
  • Page 85 11-6-2. P .C . Board Layout +15V +12V [1] Sensor characteristic table : Room temp. sensor TC, TCJ : Heat exchanger temp. sensor TA, TC, TCJ Temperature (˚C) - 85 -...
  • Page 86 11-6-3. Indoor Unit (Other Parts) Part name Checking procedure Room temp. (TA) sensor Disconnect the connector and measure the resistance value with tester. Heat exchanger (TC, TCJ) (Normal temp.) sensor Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC, TCJ (kΩ) 20.7 12.6 10.0...

  • Page 87: How To Replace The Main Parts

    12. HOW TO REPLACE THE MAIN PARTS WARNING • Since high voltages pass through the electrical parts, turn off the power without fail before proceeding with the repairs. Electric shocks may occur if the power plug is not disconnected. • After the repairs have been completed (after the front panel and cabinet have been installed), perform a test run, and check for smoking, unusual sounds and other abnormalities.
  • Page 88 Part name Procedures Remarks Front panel 1) Stop operation of the air conditioner and turn off its main power supply. 2) Remove screw holding the terminal cover Front panel Terminal cover 3) Remove the fixing screw (2 pcs) on front panel. Screw 4) Take off the hooks of front panel from top side of the back body.
  • Page 89 Part name Procedures Remarks Electrical part 1) Follow the procedure item ③. P.C. board TA sensor Connector position TCJ sensor (For Multiple model) Horizontal Louver TC sensor motor connector Earth line Unit LED display Power supply Wireless adapter connector for ionizer connector 2) Remove screw holding the electrical part cover.
  • Page 90 Part name Procedures Remarks Electrical part 5) Remove the cover drain from main unit. Take off hooks TCJ sensor (For Multiple model) Earth line TC sensor Cover drain 6) Remove the earth screw and earth line from the evaporator. 7) Pull out TC, TCJ sensor from sensor holder of the evaporator.
  • Page 91 Part name Procedures Remarks Electrical part 9) Remove the fixing screw that secures unit LED display then pull out from main body. Screw Unit LED display 10) Remove the fixing screw that secures the electrical box then pull out from main body. Screw - 91 -...
  • Page 92 Part name Procedures Remarks Horizontal louver 1) Remove center shaft of the horizontal louver from the drain pan then remove side shaft. Horizontal louver Push center arm of drain pan - 92 -...
  • Page 93 Part name Procedures Remarks Fan motor 1) Follow the procedure item ③, ④ and ⑤ 2) Loosen the set screw of the cross flow fan. Hexagon screw driver 3) Remove 2 fixing screws of the motor band. 4) Pull motor band and fan motor outward. Screws Fan motor Motor band...
  • Page 94 Part name Procedures Remarks Plasma ion 1) Follow the procedure item ③ assembly 2) Disconnect the plasma ion connector. Unit high voltage Cover ion High voltage wire Plasma ion connector (3P) 3) Remove cover ion by push hooking claw to left side direction and then pulling out of the drain pan.
  • Page 95 Part name Procedures Remarks Drain pan 1) Follow the procedure item ③ assembly 2) Remove fixing screw of the unit display and remove unit display. Unit display Cover ion High voltage wire Louver motor HR connector (white) 3) Disconnect the cord motor of Louver-HR (5P) 4) Disconnect the plasma ion connector.
  • Page 96 Part name Procedures Remarks Drain pan 7) Remove drain pan can be selected remove assembly drain hose or not remove drain hose following: - Not remove drain hose; Pulling out the drain pan from back body, then holding the drain pan with main unit. Drain pan - Remove drain hose;...
  • Page 97 Part name Procedures Remarks 1) Follow the procedure item  . Drain hose 2) The drain hose can be removed by removing the screw securing the drain hose then secure rotate steel plate of drain hose to out of the drain pan and pulling out the drain hose Screwdriver Screws...
  • Page 98 Part name Procedures Remarks Vertical louver 1) Remove drain pan follow the procedure item assembly ③ and ⑧. Screws Screws 2) Remove 2 fixing screws from the base vertical louver, then remove the vertical louver assembly from the main body. Vertical louver assembly - 98 -...
  • Page 99 Part name Procedures Remarks Cross flow fan 1) Follow the procudure item ⑧ and ⑩. 2) Loosen the set screw of the cross flow fan. Hexagon screw driver 3) Remove 2 fixing screws from the bearing base and 3 fixing screws of evaporator, then remove it Bearing base from the main unit.
  • Page 100 Part name Procedures Remarks Heat exchanger 1) Follow the procedure item ③ . (Evaporator) 2) Remove TA sensor, cover drain, TC/TCJ sensor and earth line from the heat exchanger. TA sensor TCJ sensor (For multiple model) Earth line TC sensor Cover drain 3) Remove 3 fixing screws at the left side of the heat exchanger.
  • Page 101 Part name Procedures Remarks Heat exchanger 5) Remove the pipe holder from the rear side of the (Evaporator) main unit. Un-hook 2 position 6) Pull out the heat exchanger to upper side <To re-installation> - Keep the back body horizontally and put the heat exchanger to the back body - Make sure the heat exchanger can be assembled with the back body and secure it tightly with screws.
  • Page 102 Microcomputer Part name Procedure Remarks Common procedure 1) Turn the power supply off to stop the Replace terminal block,  operation of air-conditioner. microcomputer ass’y and the P .C. board ass’y. 2) Remove the front panel. • Remove the 2 fixing screws. 3) Remove the electrical part base.

  • Page 103: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit ELECTRICAL PARTS ASSEMBLY Location Part Location Part Description Description 43T00823 FRONT PANEL ASSY 43T20361 CROSS FLOW FAN ASSY 43T09592 GRILLE OF AIR INLET ASSY 43T39423 MOTOR BAND BACK 43T80363 AIR FILTER 43T39424 MOTOR BAND FRONT 43T03421...
  • Page 104 13-2. Indoor Unit (Part-E) CORD MOTOR HOUSING‐LED HOUSING‐WiFi TCJ‐SENSOR TC‐SENSOR TA‐SENSOR Location Part Location Part Description Description 43T6V695 TERMINAL(3P) 43T60533 HOUSING-WiFi 43T62340 CORD-CLAMP 43T60537 HOUSING-LED 43TN9743 PC BOARD (WP-501) 43T60538 CORD-MOTOR 43T6W727 PC BOARD ASSY : WRS-LED 43T95302 SPACER(EDGE) 43T50399 TEMPERATURE SENSOR 43T95303 SUPPORTER, ASSY 43T50393...
  • Page 105 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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