Toshiba RAS-B50G3KVSG-ND Service Manual
  1. Manuals
  2. Brands
  3. Toshiba Manuals
  4. Air Conditioner
  5. RAS-B50G3KVSG-ND
  6. Service manual
Toshiba RAS-B50G3KVSG-ND Service Manual

Toshiba RAS-B50G3KVSG-ND Service Manual

Hide thumbs Also See for RAS-B50G3KVSG-ND:
Table of Contents

Advertisement

Quick Links

Download this manual
FILE NO. SVM-24022-1
SERVICE MANUAL
SPLIT TYPE
Indoor Unit
Outdoor Unit
RAS-50G3AVSG-ND
RAS-B50G3KVSG-ND
R32
Revised on Jun, 2024

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the RAS-B50G3KVSG-ND and is the answer not in the manual?

Questions and answers

Related Manuals for Toshiba RAS-B50G3KVSG-ND

Summary of Contents for Toshiba RAS-B50G3KVSG-ND

  • Page 1 FILE NO. SVM-24022-1 SERVICE MANUAL SPLIT TYPE Indoor Unit Outdoor Unit RAS-50G3AVSG-ND RAS-B50G3KVSG-ND Revised on Jun, 2024...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ................3 2. SPECIFICATIONS ..................6 3. REFRIGERANT R32 .................. 8 4. CONSTRUCTION VIEWS ................ 16 5. WIRING DIAGRAM .................. 18 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 19 7. REFRIGERANT CYCLE DIAGRAM ............20 8. CONTROL BLOCK DIAGRAM ..............22 9.

  • Page 3: Safety Precautions

    1. SAFETY PRECAUTIONS Read the precautions in this manual This appliance is fi lled with R32. carefully before operating the unit. (Flammable Material) Information included in the Operation Service personnel should be handing this equipment Manual and/or Installation Manual. with reference to the Installation Manual. Warning Indications on the Air Conditioner Unit Warning indication Description...
  • Page 4 CAUTION TO DISCONNECT THE APPLIANCE FROM THE MAIN POWER SUPPLY This appliance must be connected to the main power supply by a circuit breaker or a switch with a contact separation of at least 3 mm. DANGER • ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO IN-STALL/MAINTAIN THE AIR CONDITIONER.

  • Page 5: For Reference

    • Be aware that refrigerants may not contain an odour. Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, flame, sparks, • or other sources or ignition. Else, it may explode and cause injury or death. A special tool for the R32 or R410A refrigerant is required for installation.

  • Page 6: Specifications

    (Cooling / Heating) -15,46/-25,24 Installation plate Accessory Indoor unit Wireless remote controller Batteries Remote controller holder Toshiba Ultra pure filter Mounting screw 6(  4x25L) Remote controller holder 2(  3.1x16L) Flat head wood screw Installation manual Owner's manual * The specification may be subject to change without notice for purpose of improvement.

  • Page 7: 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 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: 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 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: Required Tools

    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: 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 14: Brazing Of Pipes

    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 1053 Front Panel Grille Inlet Air Inlet Air Filter Heat Exchanger Air Outlet Knock Out System Knock Out System 71.5 50 71.5 Wireless remote controller 17.5 Remote controller holder Drain hose (0.6m) Connecting pipe (0.72m) Connecting pipe (0.62m) 9.52) (Flare...

  • Page 17: Outdoor Unit

    4-2. Outdoor Unit - 17 -...

  • Page 18: Wiring Diagram

    5. WIRING DIAGRAM L­1 L­2 t° 3 3         250V CN30 F23  (WHI) T3.15A 250V 3    5 or 6 CN71 WP­500 (WHI) Outdoor Control P.C.Board CN73 CN68 CN60 CN61 CN62 CN63 CN72 CN69 (YEL) (BLU) (WHI) (WHI) (YEL) (WHI) (WHI) (GRN) 1 2 3 1 2 3 1 2 3 1 2 3 L...

  • Page 19: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type name Specifications DC-340V, 42W Fan Motor (for indoor) WDF-340-30 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 Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 30m Min. : 2m Pressure measurement Changeless : 30m Deoxidized copper pipe Gauge attaching port Outer dia. : 6.35mm Vacuum pump connecting port Thickness : 0.8mm Sectional shape Deoxidized copper pipe...

  • Page 21: Operation Data

    7-2. Operation Data <Cooling> Temperature Model name Standard Heat exchanger Indoor Outdoor Compressor Connecting condition(°C) pipe temp. RAS- pressure fan mode fan mode revolution piping Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) High High 27/19 35/- 10 to 12 48 to 50 40.8 B50G3KVSG-ND 1.0 to 1.1...

  • Page 22: Control Block Diagram

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

  • Page 23: Outdoor Unit (Inverter Assembly)

    8-2. Outdoor Unit (Inverter Assembly) - 23 -...

  • Page 24: Operation Description

    9. OPERATION DESCRIPTION 9-1. Outline of Air Conditioner Control • Detection of inverter input current and current release operation This air conditioner is a capacity-variable type air conditioner. Its system can control the speed of • Over-current detection and prevention operation to compressor motor according to load.
  • Page 25 9-2. Operation Description 1. Basic operation ......................1. Operation control ....................2. Cooling/Heating operation ................... 3. AUTO operation ....................4. DRY operation ...................... 2. Indoor fan motor control ................... 3. Outdoor fan motor control ..................4. Capacity control ......................5. Current release control ..................... 6.

  • Page 26: Basic Operation

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

  • Page 27: Cooling/Heating Operation

    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 28: Auto Operation

    Item Operation flow and applicable data, etc. Description 1) Detects the room temperature (Ta) when 1. Basic 3. AUTO operation operation the operation started. Selection of operation mode 2) Selects an operation mode from Ta in As shown in the following figure, the operation starts by selecting automatically the status of room temperature the left figure.

  • Page 29: Fan Speed

    *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-B50G3KVSG-ND level Cooling Heating Cool Heat Fan speed Air flow rate Fan speed...
  • 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 operation) temperature. The conditions to detect the The temperature sensor of the outdoor heat ex- necessity of defrost operation differ in A, changer (Te sensor) judges the frosting status of the...

  • 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: Heating Operation

    Item Operation flow and applicable data, etc. Description 8. Louver control Louver position in heating operation Heating operation/ AUTO (HEAT) Initial setting of “Heating storage position” Louver : Directs downward (79.1°) Wide air direction Wide-angle Right wide Left wide Spot air direction Spot front Spot right Spot left...

  • Page 37: Louver Control

    Item Operation flow and applicable data, etc. Description 8. Louver control 2) Wind direction adjustment Air direction • The Up-Down louver position can be Horizontal Inclined Blowing Inclined Horizontal arbitrarily set up by blowing blowing downward blowing blowing pressing [FIX ] button.

  • Page 38: 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 39: Temporary Operation

    Item Operation flow and applicable data, etc. Description 1) When pressing [RESET] button, the 9. Temporary Pressing [RESET] button starts the temporary temporary [AUTO] operation starts. operation operation of [AUTO] operation. When keeping [RESET] button pressed for 10 seconds or more, the 2) When keeping [RESET] button pressed temporary [COOL] operation is performed.

  • Page 40: 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 12. 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 41: Self-Cleaning Function

    Item Operation flow and applicable data, etc. Description 13. 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 42 Item Operation flow and applicable data, etc. Description 13. Self-Cleaning function 13-1-1. 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 43: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description 1. Purpose 14. 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 44: Quiet Mode

    - The compressor speed is controlled as shown in the table below. Remarks : 1. Quiet mode is unable to work in dry mode. RAS-B50G3KVSG-ND Model 2. Quiet mode is appropriate to work with less 10.8 Cool min (Hz) cooling load condition.

  • Page 45: Power Selection Mode

    Item Operation flow and applicable data,etc Description ] button on the remote controller is 1. Purpose 18. POWER pressed) Selection The function is used when its circuit Mode − Power Selection 75% is 75% of maximum breaker is shared with other electrical current.

  • Page 46: Fireplace Operation

    Item Operation flow and applicable data,etc Description 20. Fireplace Fireplace button on remote controller is Keep air circulation during other heat Operation pressed. source applied. Fireplace 1: Note: Cancel cold draft prevention control and fan With Fireplace operation on heating speed depend on user require base on basic mode indoor unit always runs and cold control.

  • Page 47: Operation Mode Selectable

    Item Operation flow and applicable data, etc. Description Operating system setting 1. Purpose 22. Operation mode Choosing the operating system as setectable appropriate in real condition 2. Operation Factory default setting prefer "Heat pump" system. Through it is able to cooling only system heating only system or return to factory default.

  • Page 48: 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 49: 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 50: Remote Controller And Its Functions

    9-4. Remote controller and Its Functions 9-4-1. Parts Name of Remote Controller Infrared signal emitter Memory and Preset button Start/Stop button ( Mode select button ( AIR FLOW and HADA CARE FLOW button ( Fireplace/8°C button ( ECO button ( Comfort sleep button ( Weekly timer ( Temp for Weekly timer (...
  • Page 51 How to set WEEKLY TIMER 1. Press to enter WEEKLY TIMER setting. Blink 2. Press to select desired day in sequence. The sequence of day symbol appears on the LCD. WEEKLY SUMO TUWETHFRSA (All day) 3. Press to select the program number. ●...
  • Page 52 5. Press to select desired operation. 6. Press to select desired temperature. ● The temperature can be set between 17°C and 30°C. 7. Press to select the desired fan speed. 8. Add operations, if required. ● Press to use 8°C operation. (Notes: Fireplace cannot select and memorize in weekly function) ●...

  • Page 53: Edit Weekly Timer Program

    Edit Weekly timer program To edit the program after confirming the weekly timer setting, follow steps 1 - 3 below. 1. Press ● The day of the week and the program number of the current day will be displayed. 2. Press to select the day of the week and press to select program number to be...
  • Page 54 To delete programs The individual program 1. Press ● The day of the week and the program number is displayed. ● Select the day to delete the program. 2. Press to select the program number to be deleted. 3. Press ●...

  • Page 55: Automatic Operation

    2. AUTOMATIC OPERATION To automatically select cooling, heating, or fan only operation. Press Press : Select Auto A. : Select the desired temperature. Min 17°C, Max 30°C Press Press 3. Press Press : Select AUTO, LOW , LOW+ , MED , MED+ , HIGH or Quiet...

  • Page 56: Hi-Power Operation

    6. Hi-POWER OPERATION To automatically control room temperature and airflow for faster cooling or heating operation (except in DRY and FAN ONLY mode) Press Press : Start and stop the operation 7. ECO OPERATION To automatically control room temperature to save energy (except in DRY and FAN ONLY mode) Press : Start and stop the operation.

  • Page 57: Power-Selection

    10. POWER-SELECTION OPERATION / SILENT OPERATION (OUTDOOR UNIT) Power-Selection ( This function is used when the circuit breaker is shared with other electrical appliances. It limits the maximum current and power consumption to 100%, 75%, or 50% and can be implemented by POWER-SELECTION.

  • Page 58: Timer Operation

    11. TIMER OPERATION Set the timer when the air conditioner is operating. Setting the ON Timer Setting the OFF Timer Press : Set the desired Press : Set the desired ON timer. OFF timer. Press : Set the timer. Press : Set the timer.

  • Page 59: 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 TIMER and weekly timer indicator This transmission mark indicates when the The time setting for timer operation and weekly remote controller transmits signals to the indoor timer function is indicated.

  • Page 60: Installation Procedure

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

  • Page 61: 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 : Ø9.52 mm Pipe insulating material (polyethylene foam, 6 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit> Drain hole 150 mm 525 mm...

  • Page 62: 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 Mounting screw × 6 Flat head wood screw × 2 Flat head wood screw × 1 Battery cover Owner’s Manual ×...
  • Page 63 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 64: Indoor Unit

    10-3. Indoor Unit 10-3-2. Cutting a hole and mounting installation plate 10-3-1. Installation place • A place which provides the spaces around the indoor <Cutting a hole> unit as shown in the diagram. When installing the refrigerant pipes from the rear. •...

  • Page 65: How To Connect Remote Controller For Wire Operation

    10-3-3. How to Connect Remote Controller for CAUTION Wire Operation • If have curtain rails, window cornice or other objects, allow space from the indoor unit should Indoor unit be 55 mm or more. • If allow space is less than 55 mm, this can affect Control wire the opening and closing of the air inlet grille and the horizontal louver.

  • Page 66: Piping And Drain Hose Installation

    10-3-4. Piping and drain hose installation Fix control wire which arrange as shown on figure 6 and 7 to terminal by provided screws (tighten firmly but not over 0.25 N·m <Piping and Drain Hose Forming> (0.03 kgf·m)). Set control wire through gutter way at rear side of remote * Since dewing results in a machine trouble, make controller as shown on figure 8.
  • Page 67 <Left-hand connection with piping> <How to fix the Drain Cap> 1) Insert hexagon wrench (4 mm) in a center head. Bend the connecting pipe so that it is laid within 43 mm above the wall surface. If the connecting pipe is laid exceeding 43 mm above the wall surface, the indoor unit may unstably be set on the wall.

  • Page 68: Indoor Unit Fixing

    10-3-5. Indoor unit fixing 10-3-6. Drainage 1. Pass the pipe through the hole in the wall, and hook 1. Run the drain hose sloped downwards. the indoor unit on the installation plate at the upper hooks. NOTE 2. Swing the indoor unit to right and left to confirm that •...

  • Page 69: Outdoor Unit

    10-4. Outdoor Unit 10-4-2. Precautions about installation in Regions 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 70: Draining The Water

    10-4-3. Draining the Water CAUTION ● Holes are provided on the base plate of the outdoor When using an air conditioner under low outside ● unit to ensure that the defrost water produced during temperature conditions (Outside temp: -5°C or heating operations is drained off efficiently.

  • Page 71: Refrigerant Piping Connection

    10-4-5. Refrigerant piping connection 10-4-4. Refrigerant Piping <Flaring> Knockout of pipe cover Knockout procedure 1. Cut the pipe with a pipe cutter. Roughness Obliquity Warp 90° Fig. 10-4-4 Rear direction 2. Insert a flare nut into the pipe, and flare the pipe. •...

  • Page 72: Vacuum Pump

    After the installation work, be sure to check for gas <Tightening connection> • leaks of the pipe connections with nitrogen. Align the centers of the connecting pipes and tighten Pressure of R32 is higher than that of R22 (Approx. • the flare nut as far as possible with your fingers .
  • Page 73 10-4-6. Evacuating <Pump down process> 1. Turn off the Air Conditioner system. After the piping has been connected to the indoor 2. Connect the charge hose from the manifold valve to the unit, you can perform the air purge together at once. service port of the packed valve at gas side.

  • Page 74: 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-B50G3KVSG-ND Model Power source 50Hz, 220 – 240V Single phase 15.85 A...
  • Page 75 10-5-2. In Case of Indoor Unit Connect With 1:1 Outdoor Unit Power Supply Input at Outdoor Unit Terminal Block (Recommend) Indoor Unit Connecting cable Stripping length of the Connecting cable connect to connecting cable Terminal block Earth line 50 mm 10 mm 10 mm 70 mm...
  • Page 76 10-5-3. Power supply input Wiring Diagram for 1:1 Outdoor Unit Power supply input at Outdoor Terminal Block (Recommend) Indoor 1 2 3 Terminal Block Outdoor 1 2 3 Terminal Block L N GND Power supply input Power supply input at Indoor Terminal Block (Optional) Indoor Terminal Block...
  • Page 77 10-5-4. In Case of Indoor Unit Connect With Inverter Multi System (IMS) Power Supply Input at Outdoor Unit Terminal Block Indoor Unit Outdoor Unit Connecting cable Stripping length of the 1(L) 2 3 Connecting cable connect to connecting cable Terminal block Earth line 50 mm 10 mm...
  • Page 78 10-6. Others Note : 1. Repeat previous step to reset Remote Control to be A. 10-6-1 . Gas leak test Remote Control A have not “A” display. Default setting of Remote Control from Indoor unit inspection locations (piping connections) factory is A. Refrigerant piping Indoor unit side piping...
  • Page 79 10-6-5. 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 80: 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 81 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 82 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 83: 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 84: 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 85: 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 in formation of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 86 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 87 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 88 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 89 Block distinction Operation of diagnosis function Action and Judgment Check Check Display flashing Block Cause of operation conditioner code code error status 1. Check installation conditions such as Outdoor P.C. Compressor drive output error. All OFF Flashes after (Relation of voltage, current error is detected packed valve opening, refrigerant board...
  • Page 90 Block distinction Operation of diagnosis function Action and Judgment Check Check Display Block Cause of operation conditioner code code flashing error status The others Compressor does not rotate. All OFF Flashes after 1. Remove connecting lead wire of the (including Because of missed wiring, error is detected compressor, and operate again.
  • Page 91 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 92: 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 93 (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”. - 93 -...
  • Page 94 (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 95 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 96 (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 97 (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 98 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 99 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 100: Outdoor Control Circuit

    12. OUTDOOR CONTROL CIRCUIT 12-1. Outdoor unit control <WP-500> Electrolytic capacitors (400V, 500µF) Compressor housing U (Red), V (white), W (Black) Protective fuse (250VAC, T3.15A) Protective fuse (250VAC, T3.15A) F101 Fan motor connector CN30 (White) TE sensor connector CN60 TD sensor connector CN61 Reactor housing S erial commucation lead...

  • Page 101: How To Check Simply The Main Parts

    12-2. How to Check Simply the Main Parts 12-2-1. How to Check the P.C. Board (Indoor Unit) (1) Operating precautions 1) When removing the front panel or the P .C. board, be sure to shut off the power supply breaker. 2) When removing the P .C.

  • Page 102: Check Procedures

    (3) Check procedures Table 12-2-1 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 or (F02) is blown. indoor fan motor short-circuited. assembly from electronic parts base.
  • Page 103 12-2-2. P .C . Board Layout +12V [1] Sensor characteristic table TD : Discharge temp. sensor TA : Room temp. sensor TC, TCJ : Heat exchanger temp. sensor TO : Outdoor temp. sensor TA, TC, TCJ, TO, TS, TE TS : Suction temp. sensor : Outdoor heat exchanger temp sensor.
  • Page 104 12-2-3. Indoor Unit (Other Parts) Part name Checking procedure Room temp. (TA) sensor Disconnect the connector and measure the resistance value with tester. Heat exchanger (TC, TCJ) (Normal temp.) sensor Temperature 10°C 2 ° 0 C 2 ° 5 C 3 °...

  • Page 105: How To Replace The Main Parts

    13. 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 106 Part name Procedures Remarks Air filters 1) Follow to the procedure in the item 1 . Air filters 2) Remove the left and the right air filters from the front panel. Front panel 1) Stop operation of the air conditioner and turn Front panel Air inlet grille off its main power supply.
  • Page 107 Part name Procedures Remarks Electric part 1) Follow the procedure item 3 . box assembly 2) Remove screw holding the electric part cover. TA sensor Connectors Fan motor connector (DC) Earth line TCJ sensor Louver motor connector TC sensor Screw Electric part cover Louver motor (L) connector (blue)
  • Page 108 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 109: Drain Pan Assembly

    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 110 Part name Procedures Remarks Vertical louver 1) Follow the procedure item 3 and 8 . Vertical louver assembly 2) Remove 2 fixing screws from the base Screw vertical louver then remove the vertical louver assembly from the body back. Screw Cover motor VT 1) Follow the procedure item 3 , 8 and 9 .
  • Page 111 Part name Remarks Procedures Cross flow fan Body back 3.5 mm Fan motor Set screw - Holding the set screw, install the cross flow fan so that flat area on shaft of the fan motor comes to the mounting hole of the set screw.
  • Page 112 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 113 13-2. Outdoor Unit Remarks Part name Procedure Common CAUTION procedure Neve r fo rget to put on the gloves at working time; otherwise an injury will be caused by the parts etc. Front cabinet 1.Detachment 1) Stop operation of the air conditioner, and turn off switch of the breaker for air conditioner 2) Take off screw for the front cabinet and front piping panel Front piping panel (Hexagonal Ø4×10L 5Pcs.) *After taking off screw,draw the front cabinet...
  • Page 114 Remarks Part name Procedure 1.Detachment Discharge 1) Perform work 1 of port cabinet 2) Take off screw for the discharge port cabinet Motor base      the partition plate (ST1T Ø4×10L 3Pcs.) ST1T Ø4×10L 5Pcs 3) Take off screw for the discharge port cabinet      the motor base (ST1T Ø4×10L 2Pcs.) Partition plate 4) Take off screw for the discharge port cabinet the bottom base(Hexagonal Ø4×10L 2Pcs.) 5) Remove the discharge port cabinet   After taking off screw, rotate the discharge port      cabinet side up from hooks Discharge port cabinet Rotate discharge port cabinet Slide up hook Hook - 114 -...
  • Page 115 Remarks Part name Procedure 1.Detachment Left cabinet 1) Perform work 1 of       and 2) Take off screw for the left cabinet (Hexagonal Ø4×10L 2Pcs.) (ST2T Ø4×8L 2Pcs.) 3) Remove the left cabinet ST2T Ø4×8L 2Pcs 1.Detachment Back cabinet 1) Perform work 1 of 2) Take off screw for the back cabinet and back piping panel (Hexagonal Ø4×10L 8Pcs.) (ST1T Ø4×10L 5Pcs.) ST1T Ø4×10L 5Pcs 3) Remove the back cabinet and back piping panel - 115 -...
  • Page 116 Remarks Part name Procedure 1.Detachment Inverter assembly 1) Perform work 1 of      ,      and WARNING Never dis asse mble the inverter unt il 5 minutes aft er t h e power su pply was turn ed off becau se there is a f e ar that an electric shock may occu r. NOTE) When working, be sure to use the insulate tools and put on the insulated gloves.
  • Page 117 Remarks Part name Procedure 6) Remove the screw of the P.C.board Inverter (Screw :M3 x 14, 7pcs.) assembly 7) Remove the screw of the earth wire Compressor (Screw :M4 x 8, 1pc.) connector 8) Remove the screw of power supply terminal box 9) Remove the P.C.board of support spacer 3 position 10) Cut the binding band and remove clamp filter...
  • Page 118 Remarks Part name Procedure 11) Move partition of inverter box up Inverter assembly (Continue)   Note) 1) When move inverter box up of the unit make sure, all connecting shall be take off 2) Check position hook locking shall be fixed Slide up them position Partition Hook inverter box Back side view of partition Hook inverter box shall be fix between reactor box part Hook of inverter box Reactor box Position hook is on top side of inverter box - 118 -...
  • Page 119 Remarks Part name Procedure Reactor 1.Detachment 1) Perform work 1 of       and 2) Move lead motor out of wire saddle 3) Take off plug connector reactor Lead heater cord 4) Take off screw fixed the reactor box      (ST1T Ø4×10L 4Pcs.) 5) Move the reactor box up from partition and move reactor lead out of edge saddle 6) Detail and component part remove reactor on box         Take off screw fixed cover top         (TT2T Ø4×8L 2Pcs.)         Take off screw fixed base reactor box         and cover under         (TT2T Ø4×8L 3Pcs.) Wire saddle         Take off screw fixed reactor 2Pcs         (TT2T Ø4×8L 8Pcs.) Plug connector reactor Edge saddle TT2T Ø4×8L Base reactor TT2T Ø4×8L TT2T Ø4×8L Cover under ST1T Ø4×10L ST1T Ø4×10L TT2T Ø4×8L TT2T Ø4×8L Position screw TT2T Ø4×8L fixed reactor - 119 -...
  • Page 120 Remarks Part name Procedure Fan motor 1.Detachment 1) Perform work 1 of       and 2) Take off screw for the inverter cover (TT2T Ø4×8L 2Pcs.) 3) Take off plug connector reactor 4) remove the inverter cover (Rotate the cover to right hand) 5) Move plug connector of fan motor out off board inverter 6) Cut band(ty-rap-tie) at lead fan motor 7) Take lead fan motor out off inverter box 8) Take lead fan motor out off edge saddle, bushing, on partition and wire saddle on inverter box 9) Take off flange nut on propeller fan (Nut Ø10) TT2T Ø4×8L 2Pcs * The flange nut is loosened by turning it clockwise Edge saddle (To tighten the flange nut, Lead fan motor Band(ty-rap-tie) turn it counterclockwise) 10) Remove the propeller fan 11) Take off screw fixed fan motor (4Pcs. each) while supporting the fan motor, so that it dose not fall...
  • Page 121 Remarks Part name Procedure 1.Detachment Compressor Nut (Ø8 mm) Perform works of 1 of 1 . 1.2 ± 0.2 N.m Recover the refrigerant gas from the outdoor (12 ± 2 kgf.cm) unit. Perform works of 2 , 4 and 5 . Remove the soundproof plate and sensor.
  • Page 122 Remarks Part name Procedure Fan guard 1.Detachment Fan guard hooking claw 1) Perform work 1 of       and 8 positions fixing CAUTION Work on the cardboard, cloth, and etc. In order to prevent damage on the product. 2) Take off screw for the bell mouth screw with assembly to air outlet cabinet (ST1T Ø4×10L 4Pcs.) 3) Remove the eight fan motor hoking claws which assembly to air outlet cabinet by push downward direction Bell mouth fixing screws CAUTION (ST1T Ø4×10L 4Pcs.) Check all the hooking claws are fixed at each specified position.
  • Page 123 Remarks Part name Procedure 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 124 Remarks Part name Procedure Pressure 1. Detachment switch 1) Perform work of Detachment 1 of 1 . 2) Recover the refrigerant gas from the outdoor unit. High Pressure switch 3) Perform works of 4 and 5 . 4) Remove the soundproof plate, TD sensor, and Protective plate for welding butyl on the pipe of pressure switch.

  • Page 125: Exploded Views And Parts List

    14. EXPLODED VIEWS AND PARTS LIST 14-1. Indoor Unit ELECTRICAL PARTS ASSEMBLY Location Part Location Part Description Description 43T00949 FRONT PANEL ASSY 43T39455 MOTOR BAND BACK ASSY 43T00715 CAP SCREW 43T39382 MOTOR BAND FRONT 43T09586 GRILLE OF AIR INLET ASSY 43T44867 REFRIGERATION CYCLE ASSY 43T80358...
  • Page 126 14-2. Indoor Unit (Part-E) Location Part Location Part Description Description 43T50393 TEMPERATURE SENSOR 43TNV464 PC BOARD (WP-048) 43T6V673 TERMINAL(5P-TF) 43T60502 HOUSING-WiFi 43T60604 SENSOR-TA(SEMITEC) 43T60605 TEMPERATURE SENSOR 43T62340 CORD-CLAMP 43T60639 HOUSING-LOUVER 43T6W727 PC BOARD ASSY : WRS-LED 43T60640 HOUSING-LED - 126 -...
  • Page 127 FIBERBOARD UNDER ASSEMBLY 43T22313 BELLMOUTH 43T91416 CUSHION PACKING UPPER 43089160 CAP, WATERPROOF 43T91301 PE SHEET 43T43721 CONDENSER ASSEMBLY 43T01331 TOSHIBA INVERTER MARK 43T41610 COMPRESSOR 43T04517 SOUND INSULATION (INSIDE) 43T47403 BONNET, 6.35 DIA 43T04513 SOUND INSULATION (OUTSIDE) 43T47404 BONNET, 9.52 DIA 43T04478...
  • Page 128 14-4. Outdoor Unit (Part-E) TD-SENSOR SUPPORT, SPACER TS-SENSOR SPACER (EDGE) TE-SENSOR PC BOARD TO-SENSOR HOLDER-SENSOR (TD) 71 4 HOLDER-SENSOR (TS) 71 5 HOLDER-SENSOR (TE) TUBE (TO) TERMINAL-6P Location Part Location Part Description Description 43TNV455 PC BOARD (WP-500) 43T50418 TC-SENSOR(TE) 43T95301 SUPPORT, SPACER 43T50417 TEMPERATURE SENSOR, TO 43T95302 SPACER(EDGE) 43T63317 HOLDER,SENSOR...
  • Page 129 CARRIER AIR CONDITIONING (THAILAND) CO., LTD. 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANGPATHUMTHANI, PATHUMTHANI 12000, THAILAND...

This manual is also suitable for:

Ras-50g3avsg-nd

Table of Contents