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Toshiba RAS-18N3KV-E Service Manual
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Toshiba RAS-18N3KV-E Service Manual

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FILE NO. SVM-12071

SERVICE MANUAL

SPLIT TYPE
Indoor Unit
Outdoor Unit
RAS-18N3KV-E
RAS-18N3AV-E
RAS-22N3KV-E
RAS-22N3AV-E
R410A
September, 2012

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Summary of Contents for Toshiba RAS-18N3KV-E

  • Page 1: Service Manual

    FILE NO. SVM-12071 SERVICE MANUAL SPLIT TYPE Indoor Unit Outdoor Unit RAS-18N3KV-E RAS-18N3AV-E RAS-22N3KV-E RAS-22N3AV-E R410A September, 2012...

  • Page 2: Table Of Contents

    FILE NO. SVM-12071 CONTENTS 1. SAFETY PRECAUTIONS ................2 2. SPECIFICATIONS ..................5 3. REFRIGERANT R410A ................7 4. CONSTRUCTION VIEWS ................ 15 5. WIRING DIAGRAM .................. 17 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 18 7. REFRIGERANT CYCLE DIAGRAM ............19 8.

  • Page 3: Safety Precautions

    FILE NO. SVM-12071 1. SAFETY PRECAUTIONS The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual. Be sure to read this installation manual carefully before installing. Recommend to the owner to perform maintenance periodically when using over long periods of time. Be sure to follow the precautions provided here to avoid safety risks.
  • Page 4 FILE NO. SVM-12071 WARNING • Installation work must be requested from the supplying retail dealership or professional vendors. Self-installation may cause water leakage, electrical shock, or fire as a result of improper installation. • Specified tools and pipe parts for model R410A are required, and installation work must be done in accordance with the manual.
  • Page 5 FILE NO. SVM-12071 CAUTION • Please read this installation manual carefbefore installing the unit. It contains further important instructions for proper installation. • Exposure of unit to water or other moisture before installation could result in electric shock. Do not store it in a wet basement or expose to rain or water.

  • Page 6: Specifications

    Installation plate Wireless remote controller Batteries Batteries cover Remote controller holder Toshiba New IAQ filter (Long) 6 (∅4 x 25L) 6 (∅4 x 25L) Mounting screw 2 (∅3.1 x 16L), 1 (∅ 3.1 x 25L) 2 (∅3.1 x 16L), 1 (∅ 3.1 x 25L)

  • Page 7: Operation Characteristic Curve

    Indoor Air-Flow Volume: High Pipe Length: 7.5m Pipe Length: 7.5m Capacity Ratio : 100% = Capacity Ratio : 100% = 5.8kW (RAS-18N3KV-E) 5.0kW (RAS-18N3KV-E) 7.0kW (RAS-22N3KV-E) 6.0kW (RAS-22N3KV-E) 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 –15...

  • Page 8: Refrigerant R410A

    FILE NO. SVM-12071 3. REFRIGERANT R410A This air conditioner adopts the new refrigerant HFC 6. When an air conditioning system charged with a (R410A) which does not damage the ozone layer. large volume of refrigerant is installed in a small room, it is necessary to exercise care so that, The working pressure of the new refrigerant R410A even when refrigerant leaks, its concentration...
  • Page 9 FILE NO. SVM-12071 Table 3-2-1 Thicknesses of annealed copper pipes Thickness (mm) Nominal diameter Outer diameter (mm) 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 FILE NO. SVM-12071 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 R410A or conven- tional flare tool. Flare processing dimensions differ according to the type of flare tool.
  • Page 11 FILE NO. SVM-12071 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 16.0 16.2 12.9 15.88 19.0 19.7 16.0 19.05 23.3 24.0 19.2 Fig.

  • Page 12: Specifications

    FILE NO. SVM-12071 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 R410A 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

    FILE NO. SVM-12071 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

    FILE NO. SVM-12071 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. It is necessary for charging refrigerant under condition of liquid because R410A is mixed type of refrigerant. 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 FILE NO. SVM-12071 3-5-3. Brazing 2. Characteristics required for flux • Activated temperature of flux coincides with As brazing work requires sophisticated techniques, the brazing temperature. experiences based upon a theoretical knowledge, it must be performed by a person qualified. •...

  • Page 16: Construction Views

    FILE NO. SVM-12071 4. CONSTRUCTION VIEWS 4-1. Indoor Unit Heat exchanger Grille Inlet Air Inlet Air filter 1050 Front Panel Air outlet Knock out system Knock out system Wireless remote controller 17.5 Remote controller holder Drain hose (0.5m) Hanger Hanger Connecting pipe (0.39m) Connecting pipe (0.49m) (Flare...

  • Page 17: Outdoor Unit

    FILE NO. SVM-12071 4-2. Outdoor Unit Ø6 hole R5.5 Ø6 hole Ø11x14 hole A detail Drawing (Back leg) Ø 11 x 14 Hole 25 Drain outlet Ø B Detail Drawing (Front leg) (For 8 - 10 anchor bolt) Ø Ø FAN-GUARD Ø...

  • Page 18: Wiring Diagram

    FILE NO. SVM-12071 5. WIRING DIAGRAM 5-1. Indoor Unit / Outdoor Unit Compressor Q200 ~ 205 Q300 ~ 305 IGBT MOS-FET CN300 Fan Motor R221 R321 R220 R320 CN700 R219 R319 Pulse Motor Valve CN603 P . C. Board (TS) MCC-5009 Suction pipe Temp.

  • Page 19: Specifications Of Electrical Parts

    FILE NO. SVM-12071 6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Model name Rating MF-340-30-3 DC340V, 30W Fan motor (for indoor) Room temp. sensor (TA-sensor) ( — ) 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) ( — ) 10kΩ...

  • Page 20: Refrigerant Cycle Diagram

    FILE NO. SVM-12071 7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-18N3KV-E / RAS-18N3AV-E T1 Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Chargeless : 15m Pressure measurement Deoxidized copper pipe Charge...
  • Page 21 FILE NO. SVM-12071 RAS-22N3KV-E / RAS-22N3AV-E T1 Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Chargeless : 15m Pressure measurement Deoxidized copper pipe Charge : 20g/m Gauge attaching port Outer dia. : 6.35mm (16 to 20m) Vacuum pump connecting port Thickness : 0.8mm...

  • Page 22: Operation Data

    FILE NO. SVM-12071 7-2. Operation Data <Cooling> Tempeature Standard Heat exchanger Indoor Outdoor Compressor Model name condition(°C) pressure pipe temp. fan mode fan mode revolution RAS- Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 27/19 35/24 18N3KV-E 0.9 to 1.1 11 to 13 40 to 42 High...

  • Page 23: Control Block Diagram

    FILE NO. SVM-12071 8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Unit M.C.U. Heat Exchanger Sensor (TC) Louver Functions Motor • Cold draft preventing Function Room Temperature Sensor (TA) • 3-minute Delay at Restart Louver Motor for Compressor Drive Control Infrared Rays Signal Receiver and Indication...
  • Page 24 FILE NO. SVM-12071 8-2. Outdoor Unit (Inverter Assembly) − −...

  • Page 25: Operation Description

    FILE NO. SVM-12071 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 • Over-current detection and prevention operation conditioner, which uses DC motor for the indoor fan to IGBT module (Compressor stop function) motor and the outdoor fan motor.
  • Page 26 FILE NO. SVM-12071 9-2. Operation Description 1. Basic operation ......................26 1. Operation control ....................26 2. Cooling/Heating operation ..................27 3. AUTO operation...................... 27 4. DRY operation ......................27 2. Indoor fan motor control ....................28 3. Outdoor fan motor control ................... 30 4.

  • Page 27: Basic Operation

    FILE NO. SVM-12071 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

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 1. Basic 2. Cooling/Heating operation operation The operations are performed in the following parts by controls according to cooling/heating conditions. 1) Receiving the operation ON signal of the remote controller, the cooling or heating operation signal starts being transferred form the indoor controller to the outdoor unit.

  • Page 29: Indoor Fan Motor Control

    *5 : Fan speed = [(M +) –L] x 1/4 + L +1.0 +0.5 (Linear approximation L(W6) from M+ and L) (Table 1) Indoor fan air flow rate RAS-18N3KV-E RAS-22N3KV-E Fan speed COOL HEAT Fan speed Air flow rate Fan speed...
  • Page 30 FILE NO. SVM-12071 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

    FILE NO. SVM-12071 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

    FILE NO. SVM-12071 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

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 6. Release protective <In cooling/dry operation> 1) When temperature of the indoor control by heat exchanger drops below 5°C, (Prevent-freezing control for indoor heat exchanger) temperature of the compressor speed is re- In cooling/dry operation, the sensor of indoor heat indoor heat duced.

  • Page 34: Defrost Control (Only In Heating Operation)

    FILE NO. SVM-12071 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.

  • Page 35: Louver Control

    FILE NO. SVM-12071 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

    * 10 (DRY max - COOL min) /6 × 3 + COOL min * 9 (DRY max - COOL min) /6 × 2 + COOL min * 8 (DRY max - COOL min) /6 × 1 + COOL min RAS-18N3KV-E RAS-22N3KV-E Cool min DRY max <Heating operation>...

  • Page 37: Temporary Operation

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 10. Temporary Pushing [RESET] button starts the temporary 1) When pushing [RESET] button, the operation operation of [AUTO] operation. When keeping temporary [AUTO] operation starts. [RESET] button pushed for 10 seconds or more, the 2) When keeping [RESET] button pushed for temporary [COOL] operation is performed.

  • Page 38: Pulse Motor Valve (Pmv) Control

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 12. Pulse motor This function controls throttle amount of the 1) When starting the operation, move the valve valve (PMV) refrigerant in the refrigerating cycle. once until it fits to the stopper. (Initialize) control According to operating status of the air * In this time, “Click”...

  • Page 39: Self-Cleaning Function

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 13. Self-Cleaning 1. Purpose function The Self-Cleaning operation is to mini- mize 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: Remote Controller-A Or B Selection

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 13. Self-Cleaning • Self-Cleaning diagram function Operation display FCU fan rpm is depend on presetting. (500RPM) FCU louver OPEN OPEN (12.7°) CLOSE ON or OFF ON or OFF Timer display depend on presetting of timer function.

  • Page 41: Quiet Mode

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 15. QUIET mode When the [QUIET] button is pushed, the fan of Quiet mode is the system which, control the the indoor unit will be restricted the revolving revolving speed of indoor fan to work constantly speed at speed L - until the [QUIET] button is at lower than speed L.

  • Page 42: One Touch Comfort

    FILE NO. SVM-12071 Item Operation flow and applicable data, etc. Description 18. One Touch One touch comfort is the fully automated operation that Operation condition for model to Comfort is set according to the preferable condition in a region. Europe market When an indoor unit receives “One Touch Comfort Signal”...

  • Page 43: Auto Restart Function

    FILE NO. SVM-12071 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.

  • Page 44: How To Cancel The Auto Restart Function

    FILE NO. SVM-12071 9-3-2. How to Cancel the Auto Restart Function To cancel auto restart function, proceed as follows : Repeat the setting procedure : the unit receives the signal and beeps three times. The unit will be required to be turned on with the remote controller after the main power supply is turned off. •...

  • Page 45: Remote Controller And Its Functions

    The coutomised settings control temperature air flow strength, air flow direction and other settings to provide you alternate contact with "ONE-TOUCH" OF THE BUTTON. If you prefer other settings you can select from the many other operation functions of your Toshiba unit Press : Start the operaton.
  • Page 46 FILE NO. SVM-12071 4. DRY OPERATION (COOLING ONLY) For dehumidification, a moderate cooling performance is controlled automatically. 1. Press : Select Dry MODE 2. Press : Set the desired temperature. 5. Hi-POWER OPERATION To automatically control room temperature and airflow for faster cooling operation (except in DRY and FAN ONLY mode).
  • Page 47 FILE NO. SVM-12071 9. PRESET OPERATION Set your preferred operation for future use. The setting will be memorized by the unit for future operation (except air flow direction). 1. Select your preferred operation. 2. Press and hold for 3 seconds to memorize the setting. The mark displays.

  • Page 48: Names And Functions Of Indications On Remote Controller

    FILE NO. SVM-12071 9-4-3. Names and Functions of Indications on Remote Controller [Display] All indications, except for the clock time indicator, are displayed by pushing the button. Transmission mark (PRESET) indicator This transmission mark indicates when the remote Flashes for 3 seconds when the PRESET button is controller transmits signals to the indoor unit.

  • Page 49: Installation Procedure

    FILE NO. SVM-12071 10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units For the rear left and left piping Hook Installation plate Wall Insert the cushion between the indoor unit and wall, and tilt the indoor unit for better operation. Do not allow the drain hose to get slack.

  • Page 50: Optional Installation Parts

    FILE NO. SVM-12071 10-2. Optional Parts, Accessories and Tools 10-2-1. Optional installation parts Part Parts name Q'ty Code Refrigerant piping Liquid side : ∅6.35 mm each Gas side : ∅12.70 mm Pipe insulating material (polyethylene foam, 8 mm thick) Putty, PVC tapes each <Fixing bolt arrangement of outdoor unit>...
  • Page 51 FILE NO. SVM-12071 10-2-2. Accessory and installation parts Part Part Part Part name (Q’ty) Part name (Q’ty) Part name (Q’ty) Flat head wood screw Installation plate x 1 Remote control holder x 1 ∅3.1 x 25 s x 1 Battery-cover x 1 Wireless remote control x 1 Flter x 1 Filter x 1...
  • Page 52 FILE NO. SVM-12071 10-2-3. Installation/Servicing Tools Changes in the product and components In the case of an air conditioner using R410A, 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 53: Indoor Unit

    FILE NO. SVM-12071 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 <Cutting a hole> indoor unit as shown in the diagram. When install the refrigerant pipes from the rear. •...
  • Page 54 FILE NO. SVM-12071 <When the installation plate is directly 10-3-3. Wiring Connection mounted on the wall> <How to connect the connecting cable> 1. Securely fit the installation plate onto the wall by screwing it in the upper and lower parts to hook Wiring the connecting cable can be carried up the indoor unit.
  • Page 55 FILE NO. SVM-12071 70 mm 10-3-4. How to Connect Remote Controller for Wire Operation * Wire size 28-22 AWG (0.08~0.32 mm Outer diameter not over 4.7 mm, control wire length 30 m. or less. 5 mm Indoor unit Control wire out position Control wire Control wire Remote controller...

  • Page 56: Piping And Drain Hose Installation

    FILE NO. SVM-12071 Rear right Control wire Control wire Rear left Screw (∅3.1 x 16L) for Hole for hang hang remote controller remote controller Bottom left Remote controller Left Wall Bottom right Remote controller Right Screw (∅3.1 x 25L) for 1.
  • Page 57 FILE NO. SVM-12071 <How to attach the drain cap> <In case of bottom right or bottom left piping> 1. Insert hexagon wrench (4 mm) in a center head. • After scribing slits of the front panel with a knife or a making-off pin, cut them with a pair of nippers or an equivalent tool.
  • Page 58 FILE NO. SVM-12071 CAUTION Information • Bind the auxiliary pipes (two) and connecting The lower part of indoor unit may float, due to the cable with facing tape tightly. condition of piping and you cannot fix it to the installation plate. In that case, use the 11 screws In case of leftward piping and rear-leftward piping, bind the auxiliary pipes (two) only with trovided to fix the unit and the installation plate.
  • Page 59 FILE NO. SVM-12071 CAUTION Arrange the drain pipe for proper drainage from the unit. Improper drainage can result in dew-dropping. This air conditioner has the structure designed to drain water collected from dew, which forms on the back of the indoor unit, to the drain pan. Therefore, do not store the power cord and other parts at a height above the drain guide.

  • Page 60: Installation Place

    FILE NO. SVM-12071 10-4. Outdoor Unit CAUTION 10-4-1. Installation place 1. Insall the outdoor unit in a location where there are • A place which provides the spaces around the no obstructions near its air intake or air outlet. outdoor unit as shown in the left diagram. 2.
  • Page 61 FILE NO. SVM-12071 10-4-4. Evacuating Imperial (wing nut type) Outer dia. of copper pipe R410A After the piping has been connected to the indoor unit, you can perform the air purge together at once. ∅ 6.35 1.5 to 2.0 CAUTION ∅...

  • Page 62: Wiring Connection

    FILE NO. SVM-12071 10-4-5. Wiring connection CAUTION 1. Remove the valve cover, the electric parts cover • KEEP IMPORTANT 5 POINTS FOR PIPING WORK and the cord clamp from the oudoor unit. (1) Take away dust and moisture (Inside of the 2.
  • Page 63 FILE NO. SVM-12071 18 Class Model 22 Class 10-5-2. Remote Control A-B Selection 220 - 240V Single phase, 50Hz • When two indoor units are installed in the same room or Power source 220V Single phase, 60Hz adjacent two rooms, if operating a unit, two units may 10.0A 13.5A Maximum running current...
  • Page 64 FILE NO. SVM-12071 10-5-3. Test operation To switch the TEST RUN (COOL) mode, press [RESET] button for 10 sec. (The beeper will make a short beep.) PRE.DEF RESET button F ig. 10-5-3 10-5-4. Auto restart 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.

  • Page 65: How To Diagnose The Trouble

    FILE NO. SVM-12071 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 First Confirmation...
  • Page 66 FILE NO. SVM-12071 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. Take sufficient care to avoid directly touching any of the circuit parts without first turning off the power.

  • Page 67: First Confirmation

    FILE NO. SVM-12071 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 68: Primary Judgment

    FILE NO. SVM-12071 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 69: Self-Diagnosis By Remote Controller (Check Code)

    FILE NO. SVM-12071 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-3-1, execute the self-diagnosis by the remote controller. 2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condi- tion and indicates the information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 70 FILE NO. SVM-12071 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 71 FILE NO. SVM-12071 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 72 FILE NO. SVM-12071 Block distinction Operation of diagnosis function Judgment and action Check Check Block Cause of operation conditioner Remarks code code status Outdoor Inverter over-current All off Displayed when Even if trying operation again, all P.C. board protective circuit operates. error is detected.

  • Page 73: Judgement Of Trouble By Every Symptom

    FILE NO. SVM-12071 11-5. Judgement of Trouble by Every Symptom 11-5-1. Indoor unit (Including remote controller) Operation (1) Indoor unit is not operated. Check Item Considerable principle cause Turn off power supply once, and Measures 5 second later, turn it on again. Item by symptoms Is OPERATION indicator flashing? Is it possible to turn on...
  • Page 74 FILE NO. SVM-12071 (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...
  • Page 75 FILE NO. SVM-12071 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...
  • Page 76 FILE NO. SVM-12071 (4) Indoor fan motor automatically starts to rotate by turning on power supply <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 77 FILE NO. SVM-12071 (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. The unit does not beep at all. Push the [ ] button.
  • Page 78 FILE NO. SVM-12071 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 79 FILE NO. SVM-12071 11-6. Check Code 1C (Miswiring in indoor/outdoor units) and 1E <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.

  • Page 80: How To Diagnose Trouble In Outdoor Unit

    FILE NO. SVM-12071 11-7. How to Diagnose Trouble in Outdoor Unit Check Power Supply (Voltage Rate ±10%) Turn OFF power supply. Remove connector of compressor. • Connect discharge Check 25A resistance (approx. 100Ω fuse (F01) 40W) or soldering iron failure? (plug) between +, –...
  • Page 81 FILE NO. SVM-12071 Does outdoor fan operate normally? Turn OFF power supply. Does compresser operate normally? Remove connector CN300 of outdoor fan motor. Check winding resistance by ohmmeter are correct? Compressor Check rotor locking by rotate is normal with hand. Can it rotate? Turn OFF power supply.
  • Page 82 FILE NO. SVM-12071 11-8. How to Check Simply the Main Parts (2) Inspection procedures 1) When a P.C. board is judged to be defective, 11-8-1. How to check the P.C. board (Indoor unit) check for disconnection, burning, or discolora- tion of the copper foil pattern or this P.C. board. (1) Operating precautions 2) The P.C.
  • Page 83 FILE NO. SVM-12071 11-8-2. P.C. Board Layout +12V [1] Sensor characteristic table TD : Discharge temp. sensor TA : Room temp. sensor TC : Heat exchanger temp. sensor TO : Outdoor temp. sensor TA,TC,TO,TE,TS TE : Outdoor heat exchanger temp. sensor TS : Suction temp.
  • Page 84 FILE NO. SVM-12071 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) sensor (Normal temp.) Temperature 10°C 20°C 25°C 30°C 40°C Sensor TA, TC (kΩ) 20.7 12.6 10.0...
  • Page 85 FILE NO. SVM-12071 11-8-5. Checking Method for Each Part Part name Checking procedure Electrolytic capacitor 1. Turn OFF the power supply breaker. (For boost, smoothing) 2. Discharge all three capacitors completely. 3. Check that safety valve at the bottom of capacitor is not broken. 4.
  • Page 86 FILE NO. SVM-12071 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 10 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 87: How To Replace The Main Parts

    FILE NO. SVM-12071 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. •...
  • Page 88 FILE NO. SVM-12071 Part name Procedures Remarks Front panel 4) Press "PUSH" part under the front panel  and remove hooks of the front panel from the installation plate. Installation plate Front panel Press 5) Remove the front panel fixing screws. (4 pcs.) 6) Take off four hooks of panel from rear side.
  • Page 89 FILE NO. SVM-12071 Part name Procedures Remarks Electric parts 1) Follow the procedure up to 6) in  above. ‚ box assembly 2) Remove screw of earth lead attached to the end plate of the evaporator. 3) Remove the lead wire cover, and remove connector for the fan motor and connec- tor for the louver motor from the electric parts box assembly.
  • Page 90 FILE NO. SVM-12071 Part name Procedures Remarks ƒ Horizontal louver 1) Remove shaft of the horizontal louver from the back body. (First remove the left shaft, and then remove other shafts while sliding the horizontal louver leftward.) „ Evaporator 1) Follow to the procedure in the item ‚...
  • Page 91 FILE NO. SVM-12071 Part name Procedures Remarks … Bearing 1) Follow to the procedure in the item „ 2) Remove the two screws used to secure the bearing base. Two screws screws 3) Remove the bearing base. Bearing base <Caution at assembling> •...
  • Page 92 FILE NO. SVM-12071 Part name Procedures Remarks † Fan motor 1) Follow to the procedure till item „ 2) Loosen the set screw of the cross flow fan. 3) Remove two fixing screws of the motor cover and them remove the motor cover. 4) Remove two more fixing screws of the motor band and remove the motor band.
  • Page 93 FILE NO. SVM-12071 Part name Procedures Remarks ‡ Cross flow fan <Caution at reassembling> 1) To incorporate the fan motor, remove the fan motor rubber (at shaft core side), incorporate the motor into the position in the following figure, and then install the fan motor. •...
  • Page 94 FILE NO. SVM-12071 12-3. Outdoor Unit Part name Procedure Remarks  Common 1. Detachment procedure NOTE Upper cabinet Wear gloves for this job. Otherwise, you may injure your hands on the parts, etc. Waterproof cover 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 95 FILE NO. SVM-12071 Part name Procedure Remarks Front cabinet 1. Detachment ‚ 1) Perform step 1 in  2) Remove the fixing screws (ST1TØ4 × 10L 2 pcs.) used to secure the front cabinet and inverter cover, the screws (ST1TØ4 ×...
  • Page 96 FILE NO. SVM-12071 Part name Procedure Remarks Inverter 1) Perform work of item 1 in ƒ  Inverter cover assembly 2) Remove screw (ST1TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. P.C. board (Soldered surface) •...
  • Page 97 FILE NO. SVM-12071 Part name Procedure Remarks Control board 1. Disconnect the leads and connectors connected to „ assembly the other parts from the control board assembly. 1) Leads CN603 • 3 leads (black, white, orange) connected to terminal block. CN601 •...
  • Page 98 FILE NO. SVM-12071 Part name Procedure Remarks Side cabinet 1. Side cabinet (right) … 1) Perform step 1 in ‚ and all the steps in ƒ 2) Remove the fixing screw (ST1TØ4 × 10L 4 pcs.) used for securing the side cabinet to the bottom plate and valve fixing panel.
  • Page 99 FILE NO. SVM-12071 Part name Procedure Remarks Compressor 1) Perform work of item 1 of ‡  ‚ ƒ „ … 2) Extract refrigerant gas. 3) Remove the partition board. (ST1TØ4 × 10L 3 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, Compressor and disconnect lead wire of the compressor...
  • Page 100 FILE NO. SVM-12071 Part name Procedure Remarks Electronic 1. Detachment ‰ expansion valve 1) Perform step 1 in ‚ , all the steps in ƒ coil and 1 in … Lead 2) Remove the coil by rotating it at 90° connecting part toward either direction.
  • Page 101 FILE NO. SVM-12071 Part name Procedure Remarks TE sensor (Outdoor heat exchanging temperature sensor) • Attachment With the leads pointing downward and the sensor leads pointing in the direction shown in the figure, install the sensor onto the straight pipe part of the condenser output pipe. Detail C TS sensor (Suction pipe temperature sensor) •...
  • Page 102 FILE NO. SVM-12071 Part name Procedure Remarks Replacement of 1) Cut the sensor 100 mm longer than old temperature sensor one. Cutting here Thermal for servicing only Connector sensor part 2) Cut the protective tube after pulling out it (200 mm). Common service 3) Move the protective tube toward the Cutting here...

  • Page 103: Exploded Views And Parts List

    Part Location Part Description Description 43T50308 SENSOR HEAT EXCHANGER 43T69721 PC BOARD ASSY 43T60331 TERMINAL; 3P (For RAS-18N3KV-E) 43T69320 TEMPERATURE SENSOR 43T69722 PC BOARD ASSY 43T62003 CORD CLAMP (For RAS-22N3KV-E) 43T6V316 PC BOARD ASSY;WRS-LED 43T21434 STEPPING-MOTOR 43T60386 MOTOR CORD –...

  • Page 104: Wireless Remote Controller 1

    43T09040 LOUVER, HORIZONTAL 43T70313 HOSE, DRAIN 43T03014 BODY ASSY, BACK 43T20016 FAN, ASSY, CROSS FLOW 43T44030 EVAPORATOR ASSY 43T49010 PIPE, SHIELD (For RAS-18N3KV-E) 43T83305 HOLDER, REMOTE CONTROL 43T44031 EVAPORATOR ASSY 43T82008 PLATE, INSTALLATION (For RAS-22N3KV-E) 43T19333 HOLDER, SENSOR 43T09471 GRILLE OF AIR INLET ASSY...
  • Page 105 FILE NO. SVM-12071 13-3. Outdoor Unit Location Part Location Part Description Description 43T00468 FRONT CABINET 43T46347 BODY PMV 43T00459 LEFT CABINET 43T63329 COIL PMV 43T42327 BASE PLATE ASSEMBLY 43T58306 REACTOR 43T00452 UPPER CABINET 43T20319 PROPELLER FAN 43T19329 FAN GUARD 43T21375 FAN MOTOR 43T19348 PACKED VALVE COVER 43T47001 NUT FLANGE 43T41446 COMPRESSOR...
  • Page 106 FILE NO. SVM-12071 13-4. P.C. Board Layout (Outdoor) RAS-18N3AV-E Location Part Location Part Description Description 43T62320 HEATSINK 43T60377 TEMPERATURE SENSOR 43T69943 PC BOARD 43T50304 SENSOR;HEAT EXCHANGER 43T60392 TERMINAL-5P 43T62313 BASE-PLATE-PC 43T60326 FUSE – –...
  • Page 107 FILE NO. SVM-12071 13-5. P.C. Board Layout (Outdoor) RAS-22N3AV-E Location Part Location Part Description Description 43T62331 HEATSINK 43T60377 TEMPERATURE SENSOR 43T69881 PC BOARD 43T50304 SENSOR;HEAT EXCHANGER 43T60392 TERMINAL-5P 43T62313 BASE-PLATE-PC 43T60326 FUSE – –...
  • Page 108 TOSHIBA CARRIER (THAILAND) CO.,LTD.

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