Toshiba RAS-B24S4KVG-E Service Manual
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Toshiba RAS-B24S4KVG-E Service Manual

Toshiba RAS-B24S4KVG-E Service Manual

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FILE NO. SVM-24007-2
SERVICE MANUAL
SPLIT TYPE
Indoor Unit
Outdoor Unit
RAS-B24S4KVG-E
RAS-24E2AVG-E
R32
Revised on Jul, 2024

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Summary of Contents for Toshiba RAS-B24S4KVG-E

  • Page 1 FILE NO. SVM-24007-2 SERVICE MANUAL SPLIT TYPE Indoor Unit Outdoor Unit RAS-B24S4KVG-E RAS-24E2AVG-E Revised on Jul, 2024...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................7 3. REFRIGERANT R32 .................. 9 4. CONSTRUCTION VIEWS ................ 17 5. WIRING DIAGRAM .................. 19 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 20 7. REFRIGERANT CYCLE DIAGRAM ............21 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: New Refrigerant Air Conditioner Installation

    CAUTION New Refrigerant Air Conditioner Installation • THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R32) WHICH DOES NOT DESTROY OZONE LAYER. R32 refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the working pressure of R32 refrigerant is approx.
  • Page 5 WARNING • Never modify this unit by removing any of the safety guards or bypassing any of the safety interlock switches. • Do not install in a place which cannot bear the weight of the unit. Personal injury and property damage can result if the unit falls.

  • Page 6: For Reference

    CAUTION • Exposure of unit to water or other moisture before installation may result in an electrical short. Do not store in a wet basement or expose to rain or water. • Do not install in a place that can increase the vibration of the unit. Do not install in a place that can amplify the noise level of the unit or where noise or discharged air might disturb neighbors.

  • Page 7: Specifications

    2. SPECIFICATIONS 2-1. Specification Unit model Indoor RAS-B24S4KVG-E Outdoor RAS-24E2AVG-E 6.50 Cooling capacity (kW) Cooling capacity range (kW) 1.70-7.20 7.00 Heating capacity (kW) 1.50-8.10 Heating capacity range (kW) Power supply 1Ph/50Hz/220-240V Cooling Electric Indoor Operation mode Heating characteristic Running current 0.36-0.34...

  • Page 8: Operation Characteristic Curve

    2-2. Operation Characteristic Curve <Cooling> <Heating> Conditions Conditions Indoor : DB 27 C/WB 19 Indoor : DB 20 C/WB 15 Outdoor : DB 35 C/WB 24 Outdoor : DB 7 C/WB 6 Indoor Air Flow : High Indoor Air Flow : High Pipe Length : 7.5m Pipe Length : 7.5m Voltage : 230V...

  • Page 9: 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 10: Processing Of Piping Materials

    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 11 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 12 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 13 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 14: Recharging Of Refrigerant

    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 15: Brazing Of Pipes

    3-5. Brazing of Pipes 3-5-1. Materials for Brazing 3. Types of flux • 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 or copper alloy, and is relatively expensive though temperature is higher than 800°C.
  • Page 16 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 17: Construction Views

    4. CONSTRUCTION VIEWS 4-1. Indoor Unit 1050 Air Filter Front Panel Grille Inlet Air Inlet Heat Exchanger Air Outlet Knock Out System Wireless remote controller 17.5 Remote controller holder (Flare 12.70) For stud bold ( 6) For stud bold ( 8~ Hanger Outline of indoor unit Center line...

  • Page 18: Installation Dimension

    4-2. Outdoor Unit (Unit : mm) Ø6 hole R5.5 Ø6 hole Ø11x14 hole A detail Drawing (Back leg) 2- 11 x 14 Hole Ø Drain outlet B Detail Drawing (Front leg) (For 10 anchor bolt) Ø8 - Ø FAN-GUARD Ø 436 COVER-PV Liquid side (Flare Ø...

  • Page 19: Wiring Diagram

    5. WIRING DIAGRAM Case of Inverter Multi System (IMS) model 2 3 L N Outdoor Unit 1 2 3 1 2 3 CN30 CN31 CN28 (WHI) 6.3A 250V~ Serial Communication Circuit CN63 (RED) t° CN36 (WHI) CN62 CN32 CN61 (WHI) (YEL) POWER SUPPLY CIRCUIT...

  • Page 20: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type name Specifications WDF-340-30 DC 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 Heat exchanger temp. sensor (TCJ-sensor) 10kΩ...

  • Page 21: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 12m Deoxidized copper pipe Gauge attaching port Outer dia. : 6.35mm Vacuum pump connecting port Thickness : 0.8mm Sectional shape Deoxidized copper pipe...

  • Page 22: Operation Data

    7.2 Operation Data <Cooling> Connecting Temperature Heat exchanger Model name Standard Indoor Outdoor Compressor Piping condition(°C) pipe temp. RAS- pressure fan mode fan mode revolution (rps) Indoor Outdoor P (MPa) T1 (°C) T2 (°C) High 27/19 35/- B24S4KVG-E 0.9 to 1.0 10 to 11 High 50 to 52 <Heating>...

  • Page 23: Control Block Diagram

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

  • Page 24: Outdoor Unit (Inverter Assembly)

    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 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: 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 RAS-B24S4KVG-E Fan speed Mode Cooling Heating level Fan speed Cool...
  • 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 performed 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) is According to difference between the setup value of 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 heat exchanger.) (Only in heating detected by the outdoor heat exchanger temperature. The conditions to detect the operation) The temperature sensor of the outdoor heat necessity of defrost operation differ in A,...

  • 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: Eco Operation

    Item Operation flow and applicable data, etc. Description 9. ECO When pressing [ECO] button on the remote controller, a <Cooling operation> operation Economic operation is performed. 1) The control target temperature <Cooling operation> increase 0.5ºC per hour up to 2ºC This function operates the air conditioner with the difference starting from the set temperature between the set and the room temperature as shown in the...

  • Page 37: 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 temporary [AUTO] operation starts. operation of [AUTO] operation. When keeping [RESET] button pressed for 10 seconds or more, 2) When keeping [RESET] button pressed the temporary [COOL] operation is performed.

  • Page 38: Pulse Modulating Valve (P.m.v.) Control

    Item Operation flow and applicable data, etc. Description This function controls throttle amount of the 1) When starting the operation, move the 13. Pulse 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 39: 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 40 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 41: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description 15. Remote-A or B Setting the remote controller 1. Purpose selection This operation is to operate only one 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 42: Sound Level

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

  • Page 43: Quiet Mode

    Item Operation flow and applicable data,etc Description 19. QUIET mode When the "Quiet mode" selected from [ QUIET ] button; Quiet mode is the system which, control the The fan of the indoor unit will be restricted the revolving speed of indoor fan to work revolving speed at speed UL.

  • Page 44: Comfort Sleep Mode

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

  • Page 45: Short Timer

    Item Operation flow and applicable data, etc. Description 23. Short Timer In the normal condition, after switching one circuit Purpose breaker, 3-minute delay time for compressor. To start the unit immediately for the purpose of testing, trial...etc, short timer can be used. maintenance of the unit.

  • Page 46: 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 47: 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 48: Remote Controller And Its Functions

    9-4. Remote Controller and Its Functions 9-4-1. Parts Name of Remote Controller 1 Infrared signal emitter 2 Start/Stop button ( 3 Mode select button ( 4 Temperature button ( 5 Fan speed button ( 6 Swing louver button ( SWING 7 Set louver button ( 8 8°C Heating Operation ( 8°C...
  • Page 49 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 50 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 51 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 WPS mode...
  • Page 52 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 53 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 54 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 - 54 -...
  • Page 55 Group operation. Maximum 3 groups 1 Group maximum = 16 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) - 55 -...
  • Page 56 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 57 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 58 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.” - 58 -...
  • Page 59 5. Hi-POWER OPERATION To automatically control room temperature and airflow for faster cooling or heating operation (except in DRY and FAN ONLY mode) Press : Start and stop the operation. Hi POWER 6. ECO OPERATION To automatically control room temperature to save energy (except in DRY and FAN ONLY mode) Press : Start and stop the operation.
  • Page 60 AUTO RESTART FUNCTION SETTING This product is designed so that, after a power failure, it can restart automatically in the same operating mode as before the power failure. Information The product is shipped with Auto Restart function in the ON position. Turn it OFF if this function is not required. How to turn OFF the Auto Restart Function Press and hold the [OPERATION] button on the indoor unit for 3 seconds (3 beep sounds but OPERATION lamp does not blink).

  • Page 61: Name And Functions Of Indications On Remote Controller

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

  • Page 62: Installation Procedure

    10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left, bottom left and left piping Wall Hook Installation plate Cut out a piece of SPACER from indoor unit packaging box, roll it and insert between the indoor unit and wall to tilt Flat head wood screw the indoor unit for better operation.

  • Page 63: Optional Installation Parts

    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 : Ø12.70 mm Pipe insulating material (polyethylene foam, 8 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit> 600 mm 108 mm Drain outlet...

  • Page 64: Accessory And Installation Parts

    10-2-2. Accessory and installation parts Indoor Unit Part name Part name Installation plate × 1 Wireless remote controller × 1 Battery × 2 Remote controller holder × 1 Ultra Fresh fi lter × 2 Mounting screw × 6 Flat head wood screw × 2 Owner’s Manual ×...
  • Page 65 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 66: Indoor Unit

    10-3. Indoor Unit 10-3-2. Cutting a Hole and Mounting Installation Plate 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 67: How To Connect Remote Controller For Wire Operation

    Space allows for moving range of the air inlet grille 5 mm dia. hole • and horizontal louver in operation above curtain rails, window cornice or other objects. Mounting screw (Unit : mm) ∅4mm x 25 s s s s s Clip anchor (local parts) Air inlet grille...
  • Page 68 Front panel 30 mm 10 mm * Wire size 28-22AWG or 0.08-0.32 mm Plastic for cover hole Control wire Screw Outer diameter not over 4.7 mm, control wire length 30 m. or less. Screw Type A Type B Screw cap Terminal 70 mm * Wire size 28-22AWG...

  • Page 69: Piping And Drain Hose Installation

    <How to fix the Drain Cap> 10-3-4. Piping and drain hose installation 1) Insert hexagon wrench (4 mm) in a center head. <Piping and Drain Hose Forming> * Since dewing results in a machine trouble, make sure to insulate both the connecting pipes. (Use polyethylene foam as insulating material.) Rear right Rear left...

  • Page 70: Indoor Unit Fixing

    10-3-5. Indoor unit fixing <Left-hand connection with piping> 1. Pass the pipe through the hole in the wall, and hook Bend the connecting pipe so that it is laid within 43 the indoor unit on the installation plate at the upper mm above the wall surface.

  • Page 71: Outdoor Unit

    10-4. Outdoor Unit 10-3-6. Drainage 1. Run the drain hose sloped downwards. 10-4-1. Installation place • A place which provides the spaces around the NOTE outdoor unit as shown in the diagram • Hole should be made at a slight downward slant on •...

  • Page 72: Precautions About Installation In Regions With Snowfall And Cold Temperatures

    Draining the Water 10-4-2. Precautions about installation in Regions with Snowfall and Cold Temperatures Install the drain nipple and a commercially available drain hose (with 16 mm inside diameter), and drain off • Do not use the supplied drain nipple for draining the water.
  • Page 73 Evacuating <Tightening connection> 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 74 <Pump down process> Compound pressure gauge Pressure gauge –101 kPa (–76 cmHg) 1. Turn off the Air Conditioner system. Manifold valve 2. Connect the charge hose from the manifold valve to the Handle High Handle Low service port of the packed valve at gas side. (Keep full closed) 3.

  • Page 75: Electrical Works

    10-5. Electrical works 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. RAS-B24S4KVG-E Model Power source 50Hz, 220 – 240 V Single phase Maximum running current 12.00 A...

  • Page 76: Power Supply And Connecting Cable Connection

    10-5-2. Power Supply and Connecting Cable Connection Power Supply Input at Outdoor Unit Terminal Block (Recommend) Indoor Unit Outdoor Unit Connecting cable Stripping length of the Connecting cable connect to 1 2 3 1 2 3 connecting cable Terminal block Earth line 50 mm 10 mm...
  • Page 77 10-5-3. Power supply input Wiring Diagram for 1:1 Outdoor Unit Power input at Outdoor Terminal Block (Recommend) Indoor Terminal Block Outdoor Terminal Block Power input Power input at Indoor Terminal Block (Optional) Indoor Terminal Block Power input Outdoor Terminal Block CAUTION 1.
  • Page 78 10-5-4. In Case of Indoor Unit Connect With Inverter Multi System (IMS) Indoor Unit Connecting cable Stripping length of the Connecting cable connect to 1 2 3 connecting cable Terminal block Earth line 50 mm 10 mm 10 mm 70 mm Earth line Connecting cable...
  • Page 79 10-6. Others Note : 1. Repeat previous step to reset Remote Control to be A. 10-6-1 . Gas leak test 2. Remote Control A have not “A” display. 3. Default setting of Remote Control from factory is A. Check places for indoor unit (Flarenut connection) F ig.
  • Page 80 10-6-4. Auto Restart Function Setting This product is designed so that, after a power failure, it can restart automatically in the same operating mode as before the power failure. Information The product is shipped with Auto Restart function in the ON position.

  • Page 81: 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 82 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 83 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 84: First Confirmation

    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 85: Primary Judgment

    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 86: Self-Diagnosis By Remote Controller (Check Code)

    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 information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 87 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 88 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 89 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 90 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 91 Block distinction Operation of diagnosis function Action and Judgment Display flashing Check Check Block Cause of operation conditioner code code error status The others All OFF Flashes after Compressor does not rotate. 1. Remove connecting lead wire of the (including error is detected Because of missed wiring, compressor, and operate again.
  • Page 92 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status The others Return signal of the outdoor Indoor unit Flashes when 1. Check power supply (Rate +10%) 2. If the air conditioner repeat operate (including unit has been sent when operates...

  • Page 93: Judgment Of Trouble By Every Symptom

    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 94 (2) Operation is not turned on though Indoor P.C. board is replaced <Confirmation procedure> Turn on power supply. Is wired correctly to white and Does OPERATION indicator flash? Correct wiring. black lead wires of terminal block? To item of “Indoor unit is not operated”. - 94 -...
  • Page 95 (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 96 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 97 (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 98 (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 99 11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire) (1) Outdoor unit does not operate 1) Is the voltage between R and S 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 100 11-6. How to Check Simple the Main Parts <Check procedure> Gas leakage, Discharge temp. error, disconnection of TS/TC gas leakage sensors (Check code 02, 1C) (Check code 03, 1E) Does this model have P.M.V. or not? Valve drive check Is coil of the pulse motor valve Set it correctly.

  • Page 101: How To Diagnose Trouble In Outdoor Unit

    11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly Table 11-7-1 Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power supply breaker, and remove 3P Remove connector connector which connects of compressor. inverter and compressor. Check •...

  • Page 102: How To Check Simply The Main Parts

    Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compressor, and resistance between outdoor frames by using a tester. → OK if 20MΩ or more • Is it grounded? Replace control board assembly. • Is it short-circuit ...

  • Page 103: Check Procedures

    (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 104: Board Layout

    11-8-2. P.C. Board Layout CN21 CN36 CN32 Main Electrolyte Fan Motor Stepping motor HA1 Connector Fuse Capacitor (Wireless Adapter) Connector DB01 Diode Bridge Rectifier CN30 Power supply Input terminal (Line) Fuse CN10 Display R-03 Connector Resistor CN22 HA2 Connector L-01 (Window Switch and Line Filter RAC interface)

  • Page 105: Checking Procedure

    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.) 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 106 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 107: How To Simply Judge Whether Outdoor Fan Motor Is Good Or Bad

    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 108: 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 109 Part name Procedures Remarks Air filters 1) Follow to the procedure in the item 1 . Air ÿlters 2) Remove the left and the right air filters from the front panel. Front panel 1) Stop operation of the air conditioner and turn off its main power supply.
  • Page 110 Part name Procedures Remarks Electric part 1) Follow the procedure item 3 . box assembly 2) Remove screw holding the electric part cover. TA sensor P.C.board Connectors Louver motor Earth line connector Louver motor connector TC sensor Screw Electric part cover TCJ sensor 3) Disconnect the connectors for the fan motor and louver motor from P.C.
  • Page 111 Part name Procedures Remarks Fan motor 1) Follow the procedure item 3 and 4 . Cross flow fan 2) Loosen the set screw of the cross flow fan. Cross flow fan Body back 3.5 mm Set screw Fan motor Vertical louver Hexagon screw driver 3) Remove 2 fixing screws of the motor band.
  • Page 112 Part name Procedures Remarks 1) Follow the procedure item Drain pan 2) Remove screw holding the electric part assembly cover. 3) Disconnect the louver motor connector (5P) from P.C. board assembly. 4) Disconnect the cord motor of Louver VT (5P) from the Louver VT (L/R) connector.
  • Page 113 Part name Procedures Remarks Vertical louver Follow the procedure item 3 and 8 . Vertical louver assembly Remove 2 fixing screws from the base Screw vertical louver then remove the vertical louver assembly from the body back. Screw Bearing base 1) Follow the procedure item 3 .
  • Page 114 Part name Remarks Procedures Heat exchanger 1) Follow the procedure in item 3 and 4 . (Evaporator) 2) Remove 3 fixing screws at the upper left side of the heat exchanger. 3) Remove 2 fixing screws at the upper and Screws right side of the heat exchanger.
  • Page 115 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 116 12-2. Outdoor unit Remarks Part name Procedures Common procedure 1. Detachment NOTE Upper cabinet Wear gloves for this job. Otherwise, you may injure your hands on the parts, etc. 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 117 Remarks Part name Procedures Front cabinet 1. Detachment 1) Perform step 1 in 1. 2) Remove the fixing screws (ST2TØ4 × 10L 2 pcs.) used to secure the front cabinet and inverter cover, the screws (ST2TØ4 × 10L 4 pcs.) used to secure the front cabinet at the bottom, and the fixing screws (ST2TØ4 ×...
  • Page 118 Part name Procedures Remarks Inverter assembly 1) Perform work of item 1 in 1. 2) Remove screw (ST2TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. • If removing the inverter cover in this condition, P.C. board can be checked. •...
  • Page 119 Part name Procedures Remarks Control board assembly 1. Disconnect the leads and connectors connected to the other parts from the control board CN600 CN603 CN300 CN601 CN703 assembly. 1) Leads CN700 CN602 • 3 leads (black, white, orange) connected to terminal block. •...
  • Page 120 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 121 Part name Procedures Remarks 1) Perform work of item 1 of 1 and 2, 3, 4, 5. Compressor 2) Extract refrigerant gas. 3) Remove the partition board. (ST2TØ4 × 10L 3 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, and disconnect lead wire of the compressor from the terminal.
  • Page 122 Part name Procedures Remarks Electronic expansion 1. Detachment valve coil 1) Perform step 1 in 1, 1 in 2 and 1 in 5. 2) Turn the coil by 180 degrees then remove by pull it upward. 2. Attachment 1) Insert the coil at position which perpendicular with pipe of PMV then turn the coil by 180 degrees.
  • Page 123 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 124: Exploded Views And Parts List

    13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit ELECTRICAL PARTS ASSEMBLY Location Part Location Part Description Description 43T00864 FRONT PANEL ASSY 43T39384 MOTOR COVER 43T00715 CAP SCREW 43T39455 MOTOR BAND BACK ASSY 43T09614 GRILLE OF AIR INLET ASSY 43T39382 MOTOR BAND FRONT 43T80351 AIR FILTER...
  • Page 125 13-2. Indoor Unit (Part-E) Location Part Location Part Description Description 43T50394 TEMPERATURE SENSOR 43T6W440 PC BOARD ASSY:WRS-LED 43T6V673 TERMINAL(5P-TF) 43TNV316 PC BOARD 43T50413 TA-SENSOR 43T60502 HOUSING-WiFi 43T62340 CORD-CLAMP 43T60605 TEMPERATURE SENSOR - 125 -...
  • Page 126 13-3. Outdoor Unit 37,41 Location Part Location Part Description Description 43T42382 BASE PLATE ASSEMBLY 43T46540 VALVE; PACKED 6.35 DIA 43T00459 LEFT CABINET 43T46461 VALVE; PACKED 12.7 DIA 43T00690 RIGHT CABINET ASSEMBLY 43T46469 BODY PMV 43T00735 UPPER CABINET ASSEMBLY 43T63360 COIL PMV 43T00688 FRONT CABINET ASSEMBLY 43T46367...
  • Page 127 13-4. Outdoor Unit (Part-E) Location Part Location Part Description Description 43T67310 HEATSINK 43T50360 TC-SENSOR(TO) 43TN9518 PC BOARD (WP-044) 43T62313 PC PLATE BASE 43T60392 TERMINAL-5P 43T63318 HOLDER SENSOR 43T60326 FUSE 43T63316 HOLDER SENSOR 43T50412 TC-SENSOR 43T63317 HOLDER SENSOR 43T50334 TEMPERATURE SENSOR 43T62401 TUBE 43T50352...
  • Page 128 CARRIER AIR CONDITIONING (THAILAND) CO., LTD. 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANGPATHUMTHANI, PATHUMTHANI 12000, THAILAND...

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