Toshiba RAS-25S4KVDG-ND Service Manual
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Toshiba RAS-25S4KVDG-ND Service Manual

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SERVICE MANUAL
Indoor Unit
RAS-25S4KVDG-ND
RAS-35S4KVDG-ND
R32
FILE NO. SVM-23067-1
SPLIT TYPE
Outdoor Unit
RAS-25S4AVPG-ND
RAS-35S4AVPG-ND
Revised on Aug, 2023

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Summary of Contents for Toshiba RAS-25S4KVDG-ND

  • Page 1 FILE NO. SVM-23067-1 SERVICE MANUAL SPLIT TYPE Outdoor Unit Indoor Unit RAS-25S4KVDG-ND RAS-25S4AVPG-ND RAS-35S4KVDG-ND RAS-35S4AVPG-ND Revised on Aug, 2023...

  • 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 ..............23 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, flare nut and tools which is specifi ed for R32 refrigerant. Using of existing (R22) • piping, flare nut and tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly result in explosion and injury. •...

  • Page 6: Specifications

    (Cooling / Heating) -15-46/-30-24 Installation plate Accessory Indoor unit Wireless remote controller Batteries Remote controller holder Toshiba Ultra pure filter Mounting screw 8(  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 Outdoor : DB 7 o C/WB 6 o C Capacity ratio : 100% Indoor : DB 27 C/WB 19 20.0 Indoor Air Flow : High 3.20 kW(RAS-25S4KVDG-ND) Outdoor : DB 35 C/WB 24 Pipe Length : 5m 4.00 kW(RAS-35S4KVDG-ND) Capacity ratio : 100 %=...

  • 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 Grille inlet Heat exchanger Thermal sensor Wireless adapter Air outlet Ionizer Front panel Wireless remote controller Installation plate hanger 68 67 Remote controller holder Connecting pipe (0.66m) Drain hose (0.5m) (Flare 6.35mm) Installation plate hanger...
  • Page 17 4-2. Outdoor Unit 6 hole A detail drawing (Back leg) 6 hole Drain outlet 11 x 14 hole (For 8-10 anchor bolt) FAN-GUARD B detail drawing COVER-PV P-FAN (Front leg) Front Side Electrical part Liquid side (Flare 6.35) Gas side (Flare 9.52) Service port...

  • Page 18: Wiring Diagram

    5. WIRING DIAGRAM WP-520 t° Outdoor Control P.C. Board 250V RED (U) T3.15A 250V WHI (V) BLK (W) F300 F100 F700 T3.15A T3.15A T6.3A 250V 250V 250V CN31 (WHI) Switching Serial Power Communication Supply Circuit CN61 CN62 CN63 CN64 CN70 CN72 CN73 CN71...

  • Page 19: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type name Specifications Fan motor (For indoor) ICF-340-30-7B 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...

  • Page 20: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-25S4KVDG-ND / RAS-25S4AVPG-ND Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 25m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia.
  • Page 21 RAS-35S4KVDG-ND / RAS-35S4AVPG-ND Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 25m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia. : 6.35mm Vacuum pump connecting port (16 to 25m) Thickness : 0.8mm Sectional shape...
  • Page 22 Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 20/- RAS-25S4KVDG-ND 2.1 to 2.3 33 to 35 3 to 4 High High High High RAS-35S4KVDG-ND 2.4 to 2.6 36 to 38 2 to 3 NOTES : Measure surface temperature of heat exchanger pipe around center of heat exchanger path U bent.

  • Page 23: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Panel M.C.U Operation Display Functions Heat Exchanger Sensor • Louver Control Timer • 3-minute Delay at Restart for Compressor Display Temperature Sensor Strong defrost • Motor Revolution Control Display • Processing Infrared Rays Signal Receiver (Temperature Processing) Display...
  • Page 24 8-2. Outdoor Unit (Inverter Assembly) - 24 -...

  • Page 25: 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 26 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 27: Operation Description 1. 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 28: 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 29: 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-25S4KVDG-ND RAS-35S4KVDG-ND level Cooling Heating Cooling Heating Cool Heat...
  • Page 30 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 31: 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 32: 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 33: 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 34: 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 35 • Defrost operation detect in A to D zones and met conditions TO ≥ 2 °C and TS < 1.5 °C 1) 4-Way valve keeps heating position (No reverse). 2) PMV is 500 pls. 3) Compressor Hz during defrosting. Item Model RAS-25S4KVDG-ND RAS-35S4KVDG-ND Compressor Hz (Hz) 4) FCU and CDU fan speed during defrosting. Item...
  • Page 36 Item Operation flow and applicable data, etc. Description 7. Defrost control • Strong defrost <Finish of defrost operation for strong (Only in heating Upgrade defrost ability when normal defrost ability defrost> operation) is not enough by increase defrosting finished • Returning conditions from defrost operation.

  • Page 37: 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 38: Swing

    Item Operation flow and applicable data, etc. Description 8. Louver control 3) Swing Swing operation is performed in full swing range during • Swing When pressing upper and lower limit at horizontal louver and maximum [SWING] button during left-right angle at vertical louver. operation, the louver starts swinging.

  • Page 39: 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-25S4KVDG-ND RAS-35S4KVDG-ND Cool min (Hz) DRY max (Hz) <...

  • Page 40: Temporary Operation

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

  • Page 41: Ionizer Control

    Item Operation flow and applicable data, etc. Description 13. Ionizer This function cleaning the air in the room. control If Ionizer -ON signal is received while the air conditioner stops, the Ionizer starts operation, and if it is received while the air conditioner operates, the air conditioner and the Ionizer start operation.

  • Page 42: Ionizer Control [Detection Of Abnormality]

    Item Operation flow and applicable data, etc. Description 1. Purpose 14. 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 43: Pulse Modulating Valve (P.m.v.) Control

    Item Operation flow and applicable data, etc. Description 15. 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 44: Self-Cleaning Function

    Item Operation flow and applicable data, etc. Description 16. 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 45 Item Operation flow and applicable data, etc. Description 16. Self-Cleaning function 16-1-1. 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 46: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description 1. Purpose 17. 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 47: Power Selection Mode

    Item Operation flow and applicable data,etc Description 19. POWER To automatically control room temperature to 1. Purpose Selection save energy (except in DRY and FAN ONLY The function is used when its circuit Mode mode) breaker is shared with other electrical −...

  • Page 48: Fireplace Operation

    L. In addition, - The compressor speed is controlled as show in noise level of indoor unit is less than usual. the figure. Remarks : RAS-25S4KVDG-ND RAS-35S4KVDG-ND Model Quiet mode is unable to work in dry mode. Cool min (Hz)

  • Page 49: Display Lamp Brightness Adjustment

    Item Operation flow and applicable data, etc. Description 24. Display lamp To decrease the display lamp brightness or turn it off. brightness 1. Press and hold for 3 seconds until brightness level ( adjustment ) is shown on remote control LCD then release the button. 2.

  • Page 50: Short Timer

    Item Operation flow and applicable data, etc. Description In the normal condition, after switching one circuit 26. Short Timer 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 51: Smart Sensing

    4-2) Cooling mode +0.5k / 2 minute and Heating mode -0.5k / 2 minute. 4-3) ECO1 is operated for 4 hours. 5) ECO2 is started. 5-1) Compressor shift to middle capacity Hz. Mode Model RAS-25S4KVDG-ND RAS-35S4KVDG-ND Cool (Hz) Heat (Hz) End condition 1) Human or heat source is detected.
  • Page 52 Item Operation flow and applicable data, etc. Description 28. Smart sensing <Direct air and Indirect air operation> This function is detect heat sources or humans position In AUTO, Cooling or Heating mode are and automatically adjusts air direction according to user available.

  • Page 53: Liquid By Pass (Lbp) Control

    Item Operation flow and applicable data, etc. Description 28. Smart sensing Vertical louver position moveable. 29. Liquid by pass <LBP operation> This control purpose is increasing compressor speed (LBP) control 1) Operates in heating mode. to improve heating capacity at low ambient condition 2) After compressor ON time 10 minutes.

  • Page 54: 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 55: 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 56: 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 Swing louver button 8 Exit button 9 Set louver Up-Down button MODE Set louver Left-Right button MENU...
  • Page 57 Direct Air/Indirect Air operation setting 5. MENU SETUP For select more setting of Air conditioner such as Direct Air/ Indirect Air, 1. Press MENU button for enter menu selection Hi Power, OFF Timer and other use MENU button. MENU Blink both triangle and feature mark Feature not yet set.
  • Page 58 MOTION TRACKING OPERATION SILENT OPERATION (Outdoor Unit) To automatically control room temperature to save energy when have Keep outdoor unit operating silently to ensure either yourself or not occupancy inside the room or increase the ability to adjusts the air neighborhood will have a tight sleep in nighttime.
  • Page 59 Hi POWER OPERATION FIREPLACE OPERATION To automatically control room temperature and airflow for faster Keep indoor unit’s fan blowing continuously during thermo off, to circulate cooling or heating operation (except in DRY and FAN ONLY mode) heat from other sources over the room. There are three setting parameters: Default setting >...
  • Page 60 PURE TIMER OFF OPERATION PURE (IONIZER) OPERATION To set the timer OFF when the air conditioner is operating. Capture efficiency of floating impurities in the air is accelerated by Ionizer contaminates such as bacteria, odor, smoke, dust and virus are caught and 1.
  • Page 61 6. MANUAL DEFORST OPERATION POWER-SELECTION OPERATION This function is used when the circuit breaker is shared with other electrical To defrosting the heat exchanger of the outdoor unit during Heating operation appliances. It limits the maximum current and power consumption to 100%, Press and hold : for 5 seconds , then remote control display will MENU...
  • Page 62 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 63 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 64 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 when AP mode active MODE MENU SWING EXIT...
  • Page 65 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 66 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 * This “Heat mode”...
  • Page 67 Setting in operation mode Tab for select AC Mode select Weekly schedule Smart Sensing set OFF-ON Timer set 0.5-12 Hrs. On Smart sensing On timer set from Temperature set Off mode only Indoor temperature Outdoor temperature Select Direct Air/Indirect Air or Motion Tracking Fan speed Off mode Louver set...
  • Page 68 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) - 68 -...
  • Page 69 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 70 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 71 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.” - 71 -...

  • Page 72: 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 73: Installation Procedure

    10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left and bottom left piping Hook Mounting Wall Hook screw 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 Hook the indoor unit for better operation.
  • Page 74 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> * Drain nipple and cap water proof are packed in outdoor...
  • Page 75 Installation plate × 1 Wireless remote controller × 1 Battery × 2 Remote controller holder × 1 Toshiba Ultra pure filter × 2 Mounting screw × 8 Flat head wood screw × 2 Screw × 2 Owner’s Manual × 1 Installation Manual ×...
  • Page 76 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 77 10-3. Indoor Unit 10-3-1. Installation place 1. After determining the pipe hole position on the • A place which provides the spaces around the mounting plate (A), drill the pipe hole (∅ 65 mm) at indoor unit as shown in the diagram. a slight downward slant to the outdoor side.
  • Page 78 <Space allows under the indoor unit> • Space allows for moving range of the air inlet grille Installation plate <Keep horizontal direction> and horizontal louver in operation above curtain Anchor rails, window cornice or other objects. bolt (Unit : mm) Projection 15 mm or less Air inlet grille...
  • Page 79 • Rear right • Rear left • The marking for cutting are indicated on the Front panel in the following positions. Drain hose Pre-cut mark is inside Cut pipe and welding Drain hose • Bottom right • Bottom left Drain hose 360 mm 360 mm Bottom...
  • Page 80 <How to remove the drain hose> <How to remove the drain cap> • Removed fi xing screw of LED set then pull out • Clip the drain cap by needle-nose pliers and it from the main body. pull out. • Removed 2 screws to fix drain pan then secure remove the drain pan from the main body.
  • Page 81 <Left-hand connection with piping> CAUTION • Bend the connecting pipe so that it is laid within • Bind the auxiliary pipes (two), power and 43 mm above the wall surface. If the connecting connecting cable with facing tape tightly. pipe is laid exceeding 43 mm above the wall surface, the indoor unit may unstably be set on the wall.
  • Page 82 <How to install the air inlet grille> INFORMATION 1. Insert the left and right arms of the air inlet • The lower part of indoor unit may float, due to the grille to the slot holes on the two sides of the condition of piping and installer cannot fix it to the front panel and push in completely.
  • Page 83 10-3-5. Drainage CAUTION 1. Run the drain hose sloped downwards. Arrange the drain pipe for proper drainage from the unit. Improper drainage can result NOTE in dew-dropping. • The hole should be made at a slight downward slant on the outdoor side. This air conditioner has the structure designed to drain water collected from dew, which forms Do not form the...
  • Page 84 10-4. Outdoor Unit 10-4-2. Precautions about installation in Regions 10-4-1. Installation place with Snowfall and Cold Temperatures • A place which provides the spaces around the outdoor unit as shown in the diagram. • Do not use the supplied drain nipple for draining •...
  • Page 85 Draining the Water • Holes are provided on the base plate of the outdoor 10-4-3. Refrigerant piping connection unit to ensure that the defrost water produced during <Flaring> heating operations is drained off eff ciently. If a centralized drain is required when installing the unit 1.
  • Page 86 <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 87 CAUTION • Securely tighten the valve cap with torque in the following table • KEEP IMPORTANT 7 POINTS FOR PIPING WORK Cap Size (H) Torque Take away dust and moisture (inside of the 14~18 N.m connecting pipes). H17 - H19 Valve Rod (1.4 to 1.8 kgf·m) Tighten the connections (between pipes and unit).
  • Page 88 10-5. Electrical works Model RAS-25S4KVDG-ND RAS-35S4KVDG-ND Power source 50 Hz, 220 – 240 V Single phase Maximum running current 13.00 A 14.00 A Circuit breaker rating 20 A 20 A Power supply cable H07RN-F or 60245 IEC66 (2.5 mm or more) Connecting cable 10-5-1.
  • Page 89 10-5-2. Power Supply and Connecting Cable Connection 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. Power Supply Input at Indoor Unit Terminal Block (Recommend) Indoor Unit Outdoor Unit Stripping length of the power...
  • Page 90 10-5-3. Power supply input Wiring Diagram Power Supply Input at Indoor Unit Terminal Block (Recommend) Indoor Terminal Block Chassis Power Supply Input Chassis Outdoor Terminal Block Power Supply Input at Outdoor Unit Terminal Block (Optional) Indoor Terminal Block Chassis Chassis Outdoor Terminal Block...
  • Page 91 10-6. Others 4. Press [MODE] during pushing [CHECK]. “B” 10-6-1 . Gas leak test will show on the display and “00” will disappear and the air conditioner will turn OFF. Check places for the The Remote Control B is memorized (Picture 2). indoor unit .
  • Page 92 <Maintenance & Shelf-life> • Ensure proper maintenance and prolong the shelf-life of wood by promptly cleaning when dust accumulates on decorative surfaces. • Take special care when cleaning the decorative wood. • Remove dust from decorative wood using a feather duster, a vacuum cleaner with a soft brush nozzle designed for furniture cleaning, or dry soft cloth.

  • Page 93: 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 94 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 95 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 96 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 97 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 98 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 condition and indicates the in formation of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 99 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 100 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 101 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 102 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status Compressor drive output error. All OFF Flashes after 1. Check installation conditions such as Outdoor P.C. (Relation of voltage, current error is detected packed valve opening, refrigerant board...
  • Page 103 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 104 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status Return signal of the outdoor Indoor unit Flashes when 1. . Check power supply (Rate +10%) The others operates error is detected unit has been sent when...
  • Page 105 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 106 (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 107 (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 108 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 109 (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 110 (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 111 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 112 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) Valve drive check Is coil of the pulse motor valve Set it correctly. (P.M.V.) correctly set? Set it correctly.
  • Page 113 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly 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 114 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 not grounded. Replace control board assembly.  → OK if about •...
  • Page 115 (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 116 11-8-2. P.C. Board Layout CN32 CN36 Stepping motor Fan motor Connector Fuse Main Electrolyte Capacitor CN34 Stepping motor of DB01 Thermal sensor Diode Bridge Connector Rectifier CN21 Resistor HA1 Connector (Wireless Adapter) L-01 Line Filter CN31 or CN33 CN65 Power supply Thermal sensor Input terminal Connector...
  • Page 117 11-8-3. Indoor Unit (Other Parts) Part name Checking procedure Room temp. (TA) Disconnect the connector and measure the resistance value with tester. sensor Heat exchanger (Normal temp.) (TC, TCJ) sensor Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC, TCJ (kΩ) 20.7 12.6 10.0...
  • Page 118 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 119 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 120: 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 121 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 (4 pcs) on front panel and close the air inlet grille.
  • Page 122 Part name Procedures Remarks Electrical part 1) Follow the procedure item ③. TA sensor Earth line TCJ sensor Connector position TC sensor P.C. board Wireless adapter connector Power supply Unit LED display 2) Pull out TC, TCJ sensor from sensor holder of the evaporator.
  • Page 123 Part name Procedures Remarks 5) Disconnect the connectors for the fan motor and Electrical part louver motor from P.C. board assembly. Fan motor Louver motor connector 6) Disconnect the connector of horizontal louver motor (front), horizontal louver motor (back), Ionizer, wireless adapter.
  • Page 124 Part name Procedures Remarks Ionizer assembly 1) Follow the procedure item ③ and ④ 2) Disconnect the Ionizer connector Unit high voltage Cover ion High voltage wire Ionizer connector High voltage wire Cover ion 3) Remove cover ion by push hooking claw to left side direction and then pulling out of the drain pan.
  • Page 125 Part name Procedures Remarks Cover drain 1) Take off hooks 2 position and pull out from main unit. Hooks Cover drain Drain pan 1) Follow the procedure item ③, ④ and ⑤ assembly 2) Remove 2 fixing screws Fixing screw 3) Remove drain pan from the main unit.
  • Page 126 Part name Procedures Remarks Drain hose Follow the procedure item ③, ④, ⑤ and ⑦. The drain hose can be removed by removing the screw securing the drain hose then secure rotate steel Fixing screw plate of drain hose to out of the drain pan and pulling out the drain hose.
  • Page 127 Part name Procedures Remarks Fan motor 1) Follow the procedure item ③, ④, ⑤, ⑥ and ⑦. 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 Motor band Fan motor...
  • Page 128 Part name Procedures Remarks 1) Remove drain pan follow the procedure item Vertical louver ③, ④, ⑤, ⑦ and ⑧. assembly Fixing screw 2) Remove 1 fixing screw from the base vertical louver, then remove the vertical louver assembly from the main unit.
  • Page 129 Part name Procedures Remarks 1) Remove drain pan follow the procedure Cross flow fan item ⑦ 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 from the main unit.
  • Page 130 Part name Procedures Remarks Remove follow the procedure item ③, ④ and ⑥. Heat exchanger (Evaporator) Remove TC/TCJ sensor, earth line and cover drain from the heat exchanger. TC sensor Cover drain TCJ sensor Earth line 3) Remove 3 fixing screws of evaporator at the left side of heat exchanger.
  • Page 131 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 132 12-2. Outdoor Unit Part name Procedure Remarks Common  1. Detachment procedure NOTE Wear gloves for this job. Upper cabinet Otherwise, you may injure your hands on the parts, etc. Waterproof 1) Stop operation of the air conditioner, cover and turn off the main switch of the breaker for air conditioner.
  • Page 133 Part name Procedure Remarks Front cabinet 1. Detachment ‚ 1) Perform step 1 in  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 134 Part name Procedure Remarks Inverter 1) Perform work of item 1 in  ƒ Inverter cover assembly 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the P.C.board upper part of the front cabinet. (Soldered surface) • If removing the inverter cover in this condition, P .C.
  • Page 135 Part name Procedure Remarks 1. Disconnect the leads and connectors connected to Control board assembly the other parts from the control board assembly. 1) Leads • 3 leads (black, white, orange) connected to terminal block. CR72 CN31 CN73 FAN MOTOR •...
  • Page 136 Part name Procedure Remarks Side cabinet 1. Side cabinet (right) … 1) Perform step 1 in and all the steps ‚ ƒ 2) Remove the fixing screw (ST2TØ4 × 10L 3 pcs.)used for securing the side cabinet to the bottom plate and valve fixing panel. 2.
  • Page 137 Part name Procedure Remarks Compressor 1) Perform work of item 1 of ‡  … ‚ ƒ „ 2) Extract refrigerant gas. 3) Remove the partition board. (ST2TØ4 × 10L 4 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 138 Part name Procedure Remarks 1. Detachment Electronic ‰ expansion valve 1) Perform step 1 in 2, all the steps in 3 and COIL-PMV coil 1 in 5. 2) Remove the coil by pulling it up from the electronic control valve body. 2.
  • Page 139 Part name Procedure 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.

  • Page 140: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit Location Part Location Part Description Description 43T00942 FRONT PANEL ASSY (BLACK) 43T20370 CROSS FLOW FAN ASSY 43T09658 GRILLE OF AIR INLET ASSY (WOOD) 43T39423 MOTOR BAND BACK 43T80372 AIR FILTER 43T39424 MOTOR BAND FRONT 43T03428 BODY BACK ASSY...
  • Page 141 TEMPERATURE SENSOR 43T50413 TA-SENSOR 43T60508 HOUSING-PUR-A 43T62340 CORD-CLAMP 43T50451 SENSOR ASSY (BLACK) 43TN9997 PC BOARD ASSY : WRS-LED 43T60629 HOUSING-LOUVER 43TN9995 PC BOARD 43T60628 HOUSING-THERMAL (FOR RAS-25S4KVDG-ND) 43T50435 THERMAL-SENSOR (TPL-32C) 43TN9996 PC BOARD 43T21434 STEPPING-MOTOR (FOR RAS-35S4KVDG-ND) - 141 -...
  • Page 142 13-3. Outdoor Unit Location Part Location Part Description Description 43T42399 ASM-BASE(WITH HEATER) 43T47404 BONNET, 9.52 DIA 43T00648 LEFT CABINET 43T46502 VALVE ; PACKED 6.35 DIA 43T00719 RIGHT SIDE CABINET ASSEMBLY 43T46503 VALVE ; PACKED 9.52 DIA 43T00561 UPPER CABINET 43T46569 BODY PMV 43T00718 FRONT CABINET...
  • Page 143 13-4. Outdoor Unit (Part-E) TS-SENSOR TD-SENSOR TE-SENSOR HOLDER SENSOR (TS) TO-SENSOR HOLDER SENSOR (TD) HOLDER SENSOR (TE) TUBE Location Part Location Part Description Description 43T67310 HEATSINK 43T50371 TEMPERATURE SENSOR 43TN9993 PC BOARD 43T50360 TC-SENSOR(TO) (FOR RAS-25S4AVPG-ND) 43T62313 PC PLATE BASE 43TN9994 PC BOARD 43T6W860...
  • Page 144 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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