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Toshiba RAS-25E2KVG-ND Service Manual
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Toshiba RAS-25E2KVG-ND Service Manual

Toshiba RAS-25E2KVG-ND Service Manual

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SERVICE MANUAL
Indoor Unit
RAS-25E2KVG-ND
RAS-35E2KVG-ND
R32
FILE NO. SVM-22055
SPLIT TYPE
Outdoor Unit
RAS-25E2AVG-ND
RAS-35E2AVG-ND
June, 2022

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Summary of Contents for Toshiba RAS-25E2KVG-ND

  • Page 1 FILE NO. SVM-22055 SERVICE MANUAL SPLIT TYPE Indoor Unit Outdoor Unit RAS-25E2KVG-ND RAS-25E2AVG-ND RAS-35E2KVG-ND RAS-35E2AVG-ND June, 2022...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................6 3. REFRIGERANT R32 .................. 8 4. CONSTRUCTION VIEWS ................ 16 5. WIRING DIAGRAM .................. 18 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 19 7. REFRIGERANT CYCLE DIAGRAM ............20 8. CONTROL BLOCK DIAGRAM ..............22 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

    -15,46/-25,24 -15,46/-25,24 Installation plate Accessory Indoor unit Wireless remote controller Batteries Remote controller holder Toshiba IAQ filter Mounting screw 6(  4x25L) Remote controller holder 2(  3.1x16L) Flat head wood screw Installation manual Owner's manual * The specification may be subject to change without notice for purpose of improvement.
  • Page 7 2-2. Operation Characteristic Curve <Cooling> <Heating> RAS-35E2KVG-ND RAS-35E2KVG-ND RAS-25E2KVG-ND RAS-25E2KVG-ND Conditions Conditions Indoor : DB 27 C/WB 19 Indoor : DB 20 C/WB 15 Outdoor : DB 35 C/WB 24 Outdoor : DB 7 C/WB 6 Indoor Air Flow : High...

  • Page 8: 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 9 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 10 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 11 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 12 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 13 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 14 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 15 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 16: Construction Views

    4. CONSTRUCTION VIEWS 4-1. Indoor Unit Air filter Air filter Front panel Grille inlet 60 60 60 60 Wireless remote controller Installation plate hanger 17.5 Remote controller holder Drain hose (0.5m) Connecting pipe (0.63m) (Flare 6.35mm) Installation plate hanger Connecting pipe (0.58m) (Flare 9.52mm ) Hanger...
  • Page 17 4-2. Outdoor Unit (Unit : mm) Ø6 hole R5.5 Ø6 hole Ø11x14 hole A detail Drawing (Back leg) Ø 11 x 14 Hole Drain outlet B Detail Drawing (Front leg) (For 8 - 10 anchor bolt) Ø Ø FAN-GUARD Ø 436 COVER-PV Liquid side (Flare...

  • Page 18: Wiring Diagram

    5. WIRING DIAGRAM - 18 -...

  • Page 19: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specificat Fan Motor (for indoor) SJM-240-35 AC 220~240V, 35W Room temp. sensor (TA-sensor) 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) 10kΩ at 25°C Louver motor 24BYJ48-ST Output (Rated) 4 phase, DC12V 6-2.

  • Page 20: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia. : 6.35mm Vacuum pump connecting port Thickness : 0.8mm Sectional shape...
  • Page 21 7-2. Operation Data <Cooling> Tempeature Heat exchanger Model name Standard Indoor Outdoor Compressor Connecting condition(°C) pipe temp. RAS- pressure fan mode fan mode revolution Piping Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 27/19 35/- High 14 to 15 41 to 42 High 25E2KVG-ND...

  • Page 22: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Panel M.C.U Functions Operation Heat Exchanger Sensor • Louver Control Display Timer • 3-minute Delay at Restart for Compressor Temperature Sensor Display • Motor Revolution Control Hi power Infrared Rays Signal Receiver Display •...
  • Page 23 8-2. Outdoor Unit (Inverter Assembly) - 23 -...

  • Page 24: Operation Description

    9. OPERATION DESCRIPTION 9-1. Outline of Air Conditioner Control • Detection of inverter input current and current release operation This air conditioner is a capacity-variable type air conditioner. Its system can control the speed of • Over-current detection and prevention operation to compressor motor according to load.
  • Page 25 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 ..................3. Outdoor fan motor control ..................4. Capacity control ..................... 5. Current release control ..................6.

  • Page 26: 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 27: 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 28: Indoor Fan Motor Control

    *5 : Fan speed = (M + –L) x 1/4 + L +1.0 +0.5 (Linear approximation L(W7) from M+ and L) (Table 1) Indoor fan air flow rate Fan speed Mode RAS-25E2KVG-ND RAS-35E2KVG-ND level Cooling Heating Cooling Heating Cool Heat...
  • Page 29 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 30: Outdoor Fan Motor Control

    Item Operation flow and applicable data, etc. Description 3. Outdoor fan The blowing air volume at the outdoor unit side is controlled. 1) The operation command sent motor control from the remote controller is Receiving the operation command from the controller of processed by the indoor unit indoor unit, the controller of outdoor unit controls fan speed.

  • Page 31: Capacity Control

    Item Operation flow and applicable data, etc. Description 4. 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 32: Release Protective Control By Temperature Of Indoor Heat Exchanger

    Item Operation flow and applicable data, etc. Description 6. 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 33: Defrost Control (Only In Heating Operation)

    Item Operation flow and applicable data, etc. Description 7. Defrost control (This function removes frost adhered to the outdoor The necessity of defrost operation is (Only in heating heat exchanger.) detected by the outdoor heat exchanger temperature (TE) and outdoor air operation) The temperature sensor of the outdoor heat temperature (TO).

  • Page 34: Louver Control

    Item Operation flow and applicable data, etc. Description 8. 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 35: Eco Operation

    * 10 (DRY max - COOL min) /6 x 3 + COOL min * 9 (DRY max - COOL min) /6 x 2 + COOL min * 8 (DRY max - COOL min) /6 x 1 + COOL min RAS-35E2KVG-ND RAS-25E2KVG-ND Cool min (Hz) DRY max (Hz) <Heating operation>...

  • Page 36: Temporary Operation

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

  • Page 37: Pulse Modulating Valve (P.m.v.) Control

    Item Operation flow and applicable data, etc. Description 13. Pulse This function controls throttle amount of the 1) When starting the operation, move the Modulating refrigerant in the refrigerating cycle. valve once until it fits to the stopper. valve (P.M.V.) (Initialize) According to operating status of the air conditioner, control...

  • Page 38: Self-Cleaning Function

    Item Operation flow and applicable data, etc. Description 14. 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 39 Item Operation flow and applicable data, etc. Description 14. Self-Cleaning function 14-1-1. 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 40: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description 1. Purpose 15. 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 41: Silent Operation

    Item Operation flow and applicable data,etc Description 17. Silent Silent button on remote controller is pressed. This function is used when the user need Operation Silent 1: to keep silent at outdoor side. It is limit Cooling/heating capacity is limited maximum for maximum compressor speed and CDU 70% of rated.

  • Page 42: Quiet Mode

    Remarks : Quiet mode is unable to work in dry mode. Model RAS-35E2KVG-ND RAS-25E2KVG-ND Quiet mode is appropriate to work with less Cool/Heat min (Hz) cooling load and less heating load condition. Quiet Cool (Hz) Because of the fan speed L- may cause not...

  • Page 43: Comfort Sleep Mode

    Item Operation flow and applicable data, etc. Description 21. COMFORT Cooling mode The principles of comfort sleep mode are: SLEEP mode • Quietness for more comfortable. When • The preset temperature will increase as room temperature reach setting temperature show on ECO operation (Item No. 9) •...

  • Page 44: Short Timer

    Item Operation flow and applicable data, etc. Description 24. Short Timer In the normal condition, after switching one circuit Purpose breaker, 3-minute delay time for compressor and To start the unit immediately for the purpose of 1 hour for plasma air purifier are set for the testing, trial...etc, short timer can be used.

  • Page 45: 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 set to work when shipped from the factory.

  • Page 46: 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 47: 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 Swing louver button ( SWING 7 Set louver button ( 8 8°C Heating Operation ( 8°C 9 On timer button (...
  • Page 48 4. Hi-POWER OPERATION To automatically control room temperature and airflow for faster cooling or heating operation (except in DRY and FAN ONLY mode) Press : Start and stop the operation. Hi POWER 5. ECO OPERATION To automatically control room temperature to save energy (except in DRY and FAN ONLY mode) Press : Start and stop the operation.
  • Page 49 9. AUTO RESTART FUNCTION SETTING This product is designed so that, after a power failure, it can restart automatically in the same operating mode as before the power failure. Information The product is shipped with Auto Restart function in the ON position. Turn it OFF if this function is not required. How to turn OFF the Auto Restart Function Press and hold the [OPERATION] button on the indoor unit for 3 seconds (3 beep sounds but OPERATION lamp does not blink).

  • Page 50: Name And Functions Of Indications On Remote Controller

    14. MANUAL DEFORST OPERATION To defrosting the heat exchanger of the outdoor unit during Heating operation. Press and hold : for 5 sec. then remote control display will show [    ] as picture 1 for 2 sec. 9-4-3. Name and Functions of Indications on Remote Controller All indications, except for the clock time indicator, are displayed by pressing the button.

  • Page 51: Installation Procedure

    10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left, bottom left and left piping Wall Hook Installation plate Cut out a piece of SPACER from indoor unit packaging box, roll it and insert between the indoor unit and wall to tilt the indoor unit for better operation.
  • Page 52 10-2. Installation 10-2-1. Optional installation parts Part Parts name Q’ty code Refrigerant piping Liquid side : Ø6.35 mm each Gas side : Ø9.52 mm Pipe insulating material (polyethylene foam, 6 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit> 108 mm 125 mm 28 mm...
  • Page 53 10-2-2. Accessory and installation parts Indoor Unit Part name Part name Installation plate × 1 Wireless remote control × 1 Battery × 2 Remote control holder × 1 Mounting screw × 6 Flat head wood screw × 2 Owner’s Manual × 1 Installation Manual ×...
  • Page 54 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 55 10-3-2. Cutting a hole and mounting installation 10-3. Indoor Unit 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 56 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 57 < For remote controller > *Remark : 1. Recommend to use double insulation lead wire for connect remote control and air conditioner. Remove cover of remote controller by sliding down and take it out. For wire operation, 1 remote control can control If batteries are exist, please take them out.
  • Page 58 <In case of right or left piping> <How to remove the drain hose> • After scribing slits inside of the front panel with a knife or • The drain hose can be removed by removing a making-off pin, cut them with a pair of nippers or an the screw securing the drain hose and then equivalent tool.
  • Page 59 10-3-6. Drainage CAUTION 1. Run the drain hose sloped downwards. • Bind the auxiliary pipes (two) and connecting cable with facing tape tightly. In case of leftward NOTE piping and rear-leftward piping, bind the auxiliary • Hole should be made at a slight downward slant on pipes (two) only with facing tape.
  • Page 60 10-4-2. Precautions about installation in Regions 10-4. Outdoor Unit with Snowfall and Cold Temperatures 10-4-1. Installation place • Do not use the supplied drain nipple for draining • A place which provides the spaces around the water. Drain the water from all the drain holes directly. outdoor unit as shown in the diagram •...
  • Page 61 Draining the Water 10-4-3. Refrigerant piping connection • Holes are provided on the base plate of the outdoor <Flaring> unit to ensure that the defrost water produced during 1. Cut the pipe with a pipe cutter. heating operations is drained off efficiently. If a centralized drain is required when installing the unit on a balcony or wall, follow the steps below to drain off the water.
  • Page 62 <Tightening connection> Evacuating Align the centers of the connecting pipes and tighten After the piping has been connected to the indoor unit, the flare nut as far as possible with your fingers . Then you can perform the air purge together at once. tighten the nut with a spanner and torque wrench as shown in the figure.
  • Page 63 CAUTION • Securely tighten the valve cap with torque in the following table • KEEP IMPORTANT 7 POINTS FOR PIPING WORK Take away dust and moisture (inside of the Cap Size (H) Torque connecting pipes). 14~18 N.m Tighten the connections (between pipes and unit). H17 - H19 Valve Rod (1.4 to 1.8 kgf·m)
  • Page 64 The power supply can be selected to connect to indoor unit or outdoor unit. Choose proper way and connect the power supply and connecting cable by follow the instruction as following. Model RAS-25E2KVG-ND RAS-35E2KVG-ND Power source 50Hz, 220 – 240V Single phase 7.20A...
  • Page 65 10-5-2. Power Supply and Connecting Cable Connection Power Supply Input at Outdoor Unit Terminal Block (Recommend) Indoor Unit Outdoor Unit Stripping length of the Connecting cable Connecting cable 1 2 3 connect to 1 2 3 connecting cable Terminal block (L N 1 2 3) Earth line 50 mm 10 mm...
  • Page 66 10-6. Others Note : 1. Repeat previous step to reset Remote Control to be A. 10-6-1 . Gas leak test 2. Remote Control A have not “A” display. 3. Default setting of Remote Control from factory is A. Check places for indoor unit (Flarenut connection) F ig.

  • Page 67: How To Diagnose The Trouble

    11. HOW TO DIAGNOSE THE TROUBLE The pulse motor circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according to the trouble diagnosis procedure as described below. (Refer to the check points in servicing written on the wiring diagrams attached to the indoor/outdoor units.) Table 11-1 Troubleshooting Procedure...
  • Page 68 CAUTION A high voltage (equivalent to the supply voltage) is also energized to ground through the sensors, PMV and other low-voltage circuits. The sensor leads and other wires are covered with insulated tubes for protection. Nevertheless, care must be taken to ensure that these wires are not pinched.
  • Page 69 K Precautions when inspecting the control section of the outdoor unit NOTE : A large-capacity electrolytic capacitor is used in the outdoor unit controller (inverter). Therefore, if the power supply is turned off, charge (charging voltage DC280 to 380V) remains and discharging takes a lot of time. After turning off the power source, if touching the charging section before discharging, an electrical shock may be caused.
  • Page 70 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 71 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 72 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-3-1, 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 condi- tion and indicates the information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 73 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 74 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 75 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 76 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 77 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 Because of missed wiring, error is detected compressor, and operate again.
  • Page 78 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%) operates error is detected (including...
  • Page 79 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 80 (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.) Shut off the power supply once.
  • Page 81 (4) Indoor fan motor automatically starts to rotate by turning on power supply [For AC fan motor] <Inspection procedure> 1. Remove the front panel. (Remove 2 screws.) 2. Remove the cover of the fan motor lead wires. 3. Check AC voltage with CN31 connector while the fan motor is rotating. NOTE : •...
  • 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 11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire) (1) Outdoor unit does not operate 1) Is the voltage between of the indoor terminal block varied? Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the follow- ing diagram.
  • Page 84 11-6. How to Check Simple the Main Parts <Check procedure> Gas leakage, Discharge temp. error, disconnection of TS/TC gas leakage sensors (Check code 02, 1C) (Check code 03, 1E) Does this model have P.M.V. or not? Valve drive check Is coil of the pulse motor valve Set it correctly.
  • Page 85 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly Table 11-7-1 Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power supply breaker, and remove 3P Remove connector connector which connects of compressor. inverter and compressor. Check •...
  • Page 86 Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compres- sor, and resistance between outdoor frames by using a tester. → OK if 20MΩ or more • Is it grounded? Replace control board assembly. • Is it short-circuit ...
  • Page 87 (3) Check procedures Table 11-8-1 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 88 11-8-2. P .C . Board Layout +12V [1] Sensor characteristic table : Discharge temp. sensor : Room temp. sensor : Heat exchanger temp. sensor : Outdoor temp. sensor : Suction temp. sensor TA, TC, TO, TS, TE : Outdoor heat exchanger temp sensor Temperature (°C) - 88 -...
  • Page 89 11-8-3. 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) (Normal temp.) sensor Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC (kΩ) 20.7 12.6 10.0 Remote controller...
  • Page 90 11-8-5. Checking Method for Each Part Part name Checking procedure Electrolytic capacitor 1. Turn OFF the power supply breaker. 2. Discharge all three capacitors completely. 3. Check that safety valve at the bottom of capacitor is not broken. 4. Check that vessel is not swollen or exploded. 5.
  • Page 91 11-9. How to Simply Judge Whether Outdoor Fan Motor is Good or Bad 1. Symptom • Outdoor fan motor does not rotate. • Outdoor fan motor stops within several tens seconds though it started rotating. • Outdoor fan motor rotates or does not rotate according to the position where the fan stopped, etc. Remote controller check code “02 : Outdoor block, 1A : Outdoor fan drive system error”...

  • Page 92: 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 93 Part name Procedures Remarks Front panel Stop operation of the air conditioner and turn Front panel off its main power supply. Open two screw caps and securely remove screws (2 pcs.) at the front panel. Hooks of front panel Screw Screw Screw cap Front panel...
  • Page 94 Part name Procedures Remarks Horizontal louver 1) Remove shaft of the horizontal louver from the back body. (First remove 2 the center shafts then remove the other shafts.) Drain pan Horizontal louver Fan motor 1) Follow the procedure item 3 and 4 . 2) Loosen the set screw of the cross flow fan.
  • Page 95 Part name Procedures Remarks Drain pan 1) Follow the procedure item 3 . assembly 2) Remove screw holding the electric part cover. TA sensor Connectors Fan motor connector Earth line Louver motor connector Screw Electric part cover TC sensor P.C.board Louver motor connector Unit display...
  • Page 96 Part name Procedures Remarks Drain hose 1) Follow the procedure item 3 . 2) The drain hose can be removed by removing the screw securing the drain hose and then pulling out the drain hose. 3) When removing the drain hose, be careful of any sharp edges of steel plate.
  • Page 97 Part name Procedures Remarks Cross flow fan 1) Follow the procedure item 3 and 4 . 2) Loosen the set screw of the cross flow fan. Heat exchanger 3) Remove 4 fixing screws from the bearing base then remove it from the main unit. 4) Lift up the heat exchanger follow the figure.
  • Page 98 Part name Procedures Remarks Heat exchanger 1) Follow the procedure in item 3 and 4 . (Evaporator) 2) Remove 2 fixing screws at the left side of the heat exchanger. 3) Remove fixing screw at the upper right side Screws of the heat exchanger.
  • Page 99 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 100 12-2. Outdoor unit Remarks Part name Procedures 1. Detachment Common procedure NOTE Upper cabinet Wear gloves for this job. Otherwise, you may injure your hands on the parts, etc. 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 101 Remarks Part name Procedures 1. Detachment Front cabinet 1) Perform step 1 in 1. 2) Remove the fixing screws (ST2TØ4 × 10L 2 pcs.) used to secure the front cabinet and inverter cover, the screws (ST2TØ4 × 10L 4 pcs.) used to secure the front cabinet at the bottom, and the fixing screws (ST2TØ4 ×...
  • Page 102 Part name Procedures Remarks Inverter assembly 1) Perform work of item 1 in 1. 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. • If removing the inverter cover in this condition, P.C. board can be checked. •...
  • Page 103 Part name Procedure Remarks Control board 1. Disconnect the leads and connectors connected to assembly the other parts from the control board assembly. CN602 CN600 CN603 CN601 CN703 1) Leads • 3 leads (black, white, orange) connected to CN300 terminal block. •...
  • Page 104 Part name Procedures Remarks Side cabinet 1. Side cabinet (right) 1) Perform step 1 in 2 and all the steps in 3. 2) Remove the fixing screw (ST2TØ4 × 10L 4 pcs.) used for securing the side cabinet to the bottom plate and valve fixing panel 2.
  • Page 105 Part name Procedures Remarks Compressor 1) Perform work of item 1 of 1 and 2, 3, 4, 5. 2) Extract refrigerant gas. 3) Remove the partition board. (ST2TØ4 × 10L 3 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, and disconnect lead wire of the compressor from the terminal.
  • Page 106 Part name Procedures Remarks 1. Detachment Electronic expansion valve coil 1) Perform step 1 in 1 , all the steps in 2 and 1 in 5 . 2) Turn the coil by 180 degrees then remove by pull it upward. Attachment 1) Insert the coil at position which perpendicular with pipe of PMV then turn...
  • Page 107 Part name Procedures Remarks TE sensor (outdoor heat exchanging temperature sensor) " • Attachment Install the sensor onto the straight pipe part of the condenser output pipe. TS sensor (Suction pipe temperature sensor) • Attachment Install the senser onto the straight pipe part of the suction pipe. Be careful for the lead direction of the sensor.

  • Page 108: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit ELECTRICAL PARTS ASSEMBLY Location Part Location Part Description Description 43T00912 FRONT PANEL ASSY 43T39442 MOTOR BAND BACK ASSY 43T09613 GRILLE OF AIR INLET ASSY 43T39367 MOTOR BAND FRONT 43T80357 AIR FILTER 43T44796 REFRIGERANT CYCLE ASSEMBLY 43T03417...
  • Page 109 TEMPERATURE SENSOR (TC) TEMPERATURE SENSOR (TA) Location Part Location Part Description Description 43T50394 TEMPERATURE SENSOR 43TN9695 PC BOARD 43T6V673 TERMINAL(5P-TF) (FOR RAS-25E2KVG-ND) 43T50413 TA-SENSOR 43TN9696 PC BOARD 43T62340 CORD-CLAMP (FOR RAS-35E2KVG-ND) 43T6W440 PC BOARD ASSY:WRS-LED 43T60502 HOUSING-WiFi - 109 -...
  • Page 110 13-3. Outdoor Unit Location Part Location Part Description Description 43T42380 ASM-BASE(WITH HEATER) 43T41521 COMPRESSOR 43T00459 LEFT CABINET (FOR RAS-25E2AVG-ND) 43T00690 RIGHT CABINET ASSEMBLY 43T47403 BONNET, 6.35 DIA 43T00735 UPPER CABINET ASSEMBLY 43T47404 BONNET, 9.52 DIA 43T00688 FRONT CABINET ASSEMBLY 43T46504 VALVE;PACKED 6.35 DIA 43T00448 FIXING PLATE VALVE...
  • Page 111 13-4. Outdoor Unit (Part-E) FUSE TE-SENSOR PC BOARD TS-SENSOR TO-SENSOR HEATSINK HOLDER SENSOR TD-SENSOR (TE-SENSOR) HOLDER SENSOR (TS-SENSOR) PC PLATE BASE TUBE (TO-SENSOR) TERMINAL HOLDER SENSOR (TD-SENSOR) Location Part Location Part Description Description 43T62351 HEATSINK 43T50360 TC-SENSOR(TO) 43TN9697 PC BOARD 43T50336 TEMPERATURE SENSOR (FOR RAS-25E2AVG-ND)
  • Page 112 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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