Toshiba RAS-25N4KVRG-ND Service Manual
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Toshiba RAS-25N4KVRG-ND Service Manual

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SERVICE MANUAL
Indoor Unit
RAS-25N4KVRG-ND
RAS-35N4KVRG-ND
R32
FILE NO. SVM-21017-1
SPLIT TYPE
Outdoor Unit
RAS-25J2AVSG-ND1
RAS-35J2AVSG-ND1
Revised on May, 2021

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Summary of Contents for Toshiba RAS-25N4KVRG-ND

  • Page 1 FILE NO. SVM-21017-1 SERVICE MANUAL SPLIT TYPE Outdoor Unit Indoor Unit RAS-25J2AVSG-ND1 RAS-25N4KVRG-ND RAS-35N4KVRG-ND RAS-35J2AVSG-ND1 Revised on May, 2021...

  • 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 specified 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/-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 2-3. Capacity Variation ratio According to Temperature. <Cooling> <Heating> Conditions Capacity ratio : 100 %= Conditions Indoor : DB 27 C/WB 19 2.80kW (RAS-25N4KVRG-ND) Indoor : DB 20 C/WB 15 Outdoor : DB 35 C/WB 24 3.50kW (RAS-35N4KVRG-ND) Outdoor : DB 7 C/WB 6...

  • 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 1. Be sure to make setting so that liquid can be charged. 2. When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down. Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the cylinder upside down if cylinder is not equipped with siphon.
  • Page 15 2. Characteristics required for flux 3-5-3. Brazing • Activated temperature of flux coincides with the As brazing work requires sophisticated techniques, brazing temperature. experiences based upon a theoretical knowledge, it must be performed by a person qualified. • Due to a wide effective temperature range, flux is hard to carbonize.

  • Page 16: Construction Views

    4. CONSTRUCTION VIEWS 4-1. Indoor Unit Grille inlet Air filter Air filter Heat exchanger Air outlet Wireless adapter Front panel Installation plate hanger Wireless remote controller Remote controller holder Drain hose (0.5m) Connecting pipe (0.61m) Installation plate hanger (Flare 6.35mm) Installation plate hanger Connecting pipe (0.59m) (flare...
  • 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 38 Drain outlet Ø B Detail Drawing (Front leg) (For 8 - 10 anchor bolt) Ø Ø FAN-GUARD Ø...

  • Page 18: Wiring Diagram

    5. WIRING DIAGRAM WP-044 t° Outdoor Control P.C. Board 250V T3.15A 250V T3.15A 250V CN300 (WHI) Serial Communication Circuit Switching Power Supply CN501 CN600 CN601 CN602 CN603 CN700 CN703 CN705 (GRN) (WHI) (WHI) (WHI) (WHI) (WHI) (YEL) (WHI) 1 2 3 L 1 2 3 4 5 6 Color Indication BLK : BLACK...

  • Page 19: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type name Specifications ICF-340-30-6 DC280-340V, 42W Fan Motor (for indoor) Room temp. sensor (TA-sensor) 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) 10kΩ at 25°C Louver motor 24BYJ48-ST, MSBPC20F04 Output (Rated) 4 phase, DC12V 6-2.

  • Page 20: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-25N4KVRG-ND / RAS-25J2AVSG-ND1 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.
  • Page 21 RAS-35N4KVRG-ND / RAS-35J2AVSG-ND1 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 Deoxidized copper pipe...
  • Page 22 Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 20/- 2 to 3 RAS-25N4KVRG-ND 2.1 to 2.2 34 to 35 High High RAS-35N4KVRG-ND 2.3 to 2.4 38 to 39 1 to 2 High High 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 Hi-POWER • 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 ......................27 1. Operation control ....................27 2. Cooling/Heating operation ..................28 3. AUTO operation ..................... 28 4. DRY operation ......................28 2. Indoor fan motor control ..................... 29 3. Outdoor fan motor control ................... 31 4.

  • Page 27: 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

    Operation flow and applicable data, etc. Description Item 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-35N4KVRG-ND RAS-25N4KVRG-ND Cooling Heating level Cooling Heating Cool Heat Fan speed Air flow rate...
  • 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 The temperature sensor of the outdoor heat temperature (TE) and outdoor air operation) ex-changer (TE sensor) judges the frosting status of...

  • Page 35: 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 36: Swing

    Item Operation flow and applicable data, etc. Description 8. 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 37: Eco Operation

    2) The indoor fan speed is depend –3.0 on presetting and can change –4.0 every speed after setting ECO –5.0 –6.0 operation. –7.0 B zone –8.0 –9.0 a to cHz –10.0 –11.0 C zone RAS-25N4KVRG-ND RAS-35N4KVRG-ND a (Heating min Hz) c (Heating Quiet) - 37 -...

  • Page 38: 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 tion of [AUTO] operation. When keeping [RESET] temporary [AUTO] operation starts. operation button pressed for 10 seconds or more, the temporary 2) When keeping [RESET] button pressed [COOL] operation is performed.

  • Page 39: 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 40: 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 41 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 42: 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 43: Power Selection Mode

    Item Operation flow and applicable data,etc Description To automatically control room temperature to 1. Purpose 17. 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 44: 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-25N4KVRG-ND RAS-35N4KVRG-ND Quiet mode is unable to work in dry mode. Model Cool min (Hz)

  • Page 45: Display Lamp Brightness Adjustment

    Item Operation flow and applicable data, etc. Description 22. 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 46: 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 47: 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 from the factory.

  • Page 48: How To Cancel The Au To Restar T Function

    9-3-2. How to Set the Auto Restart Function To set Auto Restart Function, proceed as follows: 1. The power supply to the unit must be ON ; The function will not set or reset if the power supply is OFF. 2.

  • Page 49: Remote Controller And Its Fuctions 9- 4-1. Parts Name Of Remote Contr Oller

    9-4. Remote control 9-4-1. Remote control and its functions 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 50 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 51 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 52 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 53 6. MANUAL DEFORST OPERATION POWER-SELECTION OPERATION To defrosting the heat exchanger of the outdoor unit during Heating operation This function is used when the circuit breaker is shared with other electrical Press and hold : for 5 seconds , then remote control display will appliances.
  • Page 54 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 55 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 Build-in Active Wireless adapter by remote controller and Auto login. Select “Add AC (Adapter)” from both display above.
  • Page 56 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 57 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 58 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 59 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 - 59 -...
  • Page 60 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 61 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 62 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 63 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.” - 63 -...

  • Page 64: 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 65: 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 Installation unit packaging box, roll it and insert plate between the indoor unit and wall to tilt the indoor unit for better operation.
  • Page 66 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 67 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 68 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 69 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 70 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 install it. be 45 mm or more. •...
  • Page 71 <How to cutting the Front panel> <How to remove the drain hose> • Removed fixing screw of LED set then pull out it • To connect piping to the bottom side, the Front from the main body. panel must be cut off. •...
  • Page 72 NOTE <How to remove the drain cap> If the pipe is bent incorrectly, the indoor unit may • Clip the drain cap by needle-nose pliers and unstably be set on the wall. pull out. After passing the connecting pipe through the pipe hole, connect the connecting pipe to the auxiliary pipes and wrap the facing tape around them.
  • Page 73 10-3-4. Indoor unit fixing CAUTION 1. Pass the pipe through the hole in the wall, and hook MOUNTING INDOOR UNIT TO THE INSTALLATION PLATE the indoor unit on the installation plate at the upper • The lower part of indoor unit may float, due to the hooks.
  • Page 74 CAUTION 10-3-5. Drainage 1. Run the drain hose sloped downwards. Arrange the drain pipe for proper drainage from the unit. Improper drainage can result in dew-dropping. NOTE • Hole should be made at a slight downward slant on This air conditioner has the structure designed to drain the outdoor side.
  • Page 75 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 76 Draining the Water 10-4-3. Refrigerant piping connection • Holes are provided on the base plate of the outdoor unit <Flaring> to ensure that the defrost water produced during heating operations is drained off efficiently. If a centralized drain 1. Cut the pipe with a pipe cutter. is required when installing the unit on a balcony or wall, follow the steps below to drain off the water.
  • Page 77 <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 78 CAUTION Cap Size (H) Torque 14~18 N.m H17 - H19 • KEEP IMPORTANT 6 POINTS FOR PIPING WORK. Valve Rod (1.4 to 1.8 kgf·m) (1) Take away dust and moisture (inside of the connecting pipes). 33~42 N.m H22 - H30 (2) Tighten the connections (between pipes and unit).
  • Page 79 10-5. Electrical works Model RAS-25N4KVRG-ND RAS-35N4KVRG-ND Power source 50Hz, 220 – 240V Single phase Maximum running current 11.80A 11.85A Circuit breaker rating Power supply cable H07RN-F or 60245 IEC66 (2.0 mm or more) Connecting cable 10-5-1. Indoor unit <Outdoor unit>...
  • Page 80 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 Outdoor Unit Terminal Block (Recommend) Indoor Unit Outdoor Unit Stripping length of the...
  • Page 81 10-5-3. Power supply Input Wiring Diagram Power supply input at Outdoor unit Terminal Block (Recommend) Indoor Terminal Block Chassis Chassis Outdoor Terminal Block Power supply input Power supply input at Indoor unit Terminal Block (Optional) Indoor Terminal Block Chassis Power supply input Chassis Outdoor Terminal...
  • Page 82 10-6. Others 4. Press [MODE] during pushing [CHECK]. “B” will show on the display and “00” will disappear 10-6-1 . 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 83 10-6-5. 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 84: 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 85 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 86 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 87 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 88 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 89 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 90 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 91 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 92 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 93 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 (Relation of voltage, current error is detected packed valve opening, refrigerant 8 times*.
  • Page 94 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 Because of missed wiring, error is detected compressor, and operate again.
  • Page 95 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%) operates error is detected unit has been sent when .
  • Page 96 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 97 (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 98 (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 99 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 100 (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 101 (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 102 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 103 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 104 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. If fuse was blown, be sure to Check •...
  • Page 105 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 106 (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 107 11-8-2. P .C . Board Layout +15V +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) - 107 -...
  • Page 108 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 109 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 110 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 111: 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 112 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 113 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 114 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 115 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 - 115 -...
  • Page 116 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 - 116 -...
  • Page 117 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 118 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 Louver motor HR connector (white) 3) Disconnect the cord motor of Louver-HR (5P) 4) Remove fixing screw of drain pan 2 positions follow the figure.
  • Page 119 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 120 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 121 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 - 121 -...
  • Page 122 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 123 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 124 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 125 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 126 12-2. Outdoor unit Remarks Part name Procedures Common procedure 1. Detachment Upper cabinet NOTE 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 127 Part name Procedures Remarks Inverter assembly 1) Perform work of item 1 in 1. Inverter cover 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. P.C. board • If removing the inverter cover in this (Soldered surface) condition, P.C.
  • Page 128 Part name Procedure Remarks Control board 1. Disconnect the leads and connectors connected to assembly the other parts from the control board assembly. CN601 CN703 CN602 CN600 CN603 1) Leads • 3 leads (black, white, orange) connected to terminal block. •...
  • Page 129 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 130 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 Compressor the terminal.
  • Page 131 Part name Procedures Remarks ‰ 1. Detachment Electronic expansion valve 1) Perform step 1 in ‚ , all the steps in ƒ coil and 1 in … 2) Remove the coil by pull it upward. 2. Attachment 1) Insert a valve coil to value body by push it downward.
  • Page 132 Part name Remarks Procedures 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 133: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit ELECTRICAL PARTS ASSEMBLY Location Part Location Part Description Description 43T00837 FRONT PANEL ASSY 43T39423 MOTOR BAND BACK 43T09592 GRILLE OF AIR INLET ASSY 43T39424 MOTOR BAND FRONT 43T80363 AIR FILTER 43T39425 MOTOR COVER 43T03421 BACK BODY ASSY...
  • Page 134 Description Description 43T60532 TERMINAL(5P-TF) 43T50393 TEMPERATURE SENSOR 43T62340 CORD-CLAMP 43T60533 HOUSING-WiFi 43TN9333 PC BOARD (WP-501) 43T60537 HOUSING-LED (FOR RAS-25N4KVRG-ND) 43T60538 CORD-MOTOR 43TN9334 PC BOARD (WP-501) 43T95302 SPACER(EDGE) (FOR RAS-35N4KVRG-ND) 43T95303 SUPPORTER, ASSY 43T6W727 PC BOARD ASSY : WRS-LED 43T95304 SPACER-KGES...
  • Page 135 13-3. Outdoor Unit 37,41 36,40 Location Part Location Part Description Description 43T42380 ASM-BASE(WITH HEATER) 43T47404 BONNET, 9.52 DIA 43T00459 LEFT CABINET 43T46504 VALVE;PACKED 6.35 DIA 43T00690 RIGHT CABINET ASSEMBLY 43T46503 VALVE ; PACKED 9.52 DIA 43T00735 UPPER CABINET ASSEMBLY 43T46347 BODY PMV 43T00688 FRONT CABINET ASSEMBLY...
  • Page 136 13-4. Outdoor Unit (Part-E) TO-SENSOR TE-SENSOR TD-SENSOR TS-SENSOR 710 HOLDER-SENSOR (TE) 711 HOLDER-SENSOR (TS) 712 HOLDER-SENSOR (TD) Location Part Location Part Description Description 43T62351 HEATSINK 43T50334 TEMPERATURE SENSOR 43TN9331 PC BOARD 43T50352 TEMPERATURE SENSOR (FOR RAS-25J2AVSG-ND1) 43T50360 TC-SENSOR(TO) 43TN9332 PC BOARD 43T62313 PC PLATE BASE (FOR RAS-35J2AVSG-ND1)
  • Page 137 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.

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