Toshiba RAS-M10YKV-E Service Manual
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Toshiba RAS-M10YKV-E Service Manual

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FILE NO. A00-9906

SERVICE MANUAL

AIR-CONDITIONER
SPLIT TYPE
RAS-M10YKV-E, RAS-M13YKV-E /
RAS-M18YAV-E
RAS-M10YKCV-E, RAS-M13YKCV-E /
RAS-M18YACV-E
R410A
PRINTED IN JAPAN, Nov.,1999 ToMo

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Summary of Contents for Toshiba RAS-M10YKV-E

  • Page 1: Service Manual

    FILE NO. A00-9906 SERVICE MANUAL AIR-CONDITIONER SPLIT TYPE RAS-M10YKV-E, RAS-M13YKV-E / RAS-M18YAV-E RAS-M10YKCV-E, RAS-M13YKCV-E / RAS-M18YACV-E R410A PRINTED IN JAPAN, Nov.,1999 ToMo...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ..................3 2. REFRIGERANT R410A ................8 3. CONSTRUCTION VIEWS ................. 16 4. WIRING DIAGRAM................... 18 5. SPECIFICATIONS OF ELECTRICAL PARTS .......... 21 6. REFRIGERANT CYCLE DIAGRAM ............22 7. CONTROL BLOCK DIAGRAM..............25 8. OPERATION DESCRIPTION ..............28 9.

  • Page 3: Specifications

    Power factor Starting current 9,86 / 9,43 / 9,04 COP (Cooling/Heating) 3,02 / 3,62 Operating noise Indoor Unit model RAS-M10YKV-E (Cooling / Heating) RAS-M13YKV-E (Cooling / Heating) High (dB•A) 36 / 39 39 / 40 Medium (dB•A) 33 / 35 35 / 35 (dB•A)

  • Page 4: Power

    RAS-M10YKCV-E, RAS-M13YKCV-E / RAS-M18YACV-E Unit model Indoor RAS-M10YKCV-E, RAS-M13YKCV-E Outdoor RAS-M18YACV-E Cooling capacity (kW) Cooling capacity range (kW) 1,4 – 6,2 Power supply 220 – 230 – 240V – 1Ph – 50 Hz Electric Indoor Unit model RAS-M10YKCV-E RAS-M13YKCV-E characteristics Running current 0,15 0,15...

  • Page 5: Power

    1-2. Specifications of Performance When Each Indoor Unit is Combined with Other Unit <Cooling> Operating Unit capacity Cooling Running Power Outdoor Volts Operation indoor unit (kW) capacity current consumption operating noise status — — 4,13 (1,1 to 3,2) (1,65 to 4,99) (255 to 930) 1 unit —...
  • Page 6 1-2-1. Operation Characteristic Curve <Cooling> <Heating> • Conditions • Conditions Indoor : DB 20˚C Indoor : DB 27˚C/WB 19˚C Outdoor : DB 35˚C Outdoor : DB 7˚C/WB 6˚C Air flow : High Air flow : High Pipe length : 5m x 2 Pipe length : 5m x 2 2 units operating 2 units operating...
  • Page 7 13,81 13,81 10,41 10,41 0,15 x 2=0,30 0,50 NOTE : <Cooling> Model of Indoor unit : 10 : RAS-M10YKV-E, RAS-M10YKCV-E 13 : RAS-M13YKV-E, RAS-M13YKCV-E Indoor temp. °C : Minimum Circuit Amps. : Maximum Instantaneous Current Flow Outdoor temp. °C —...

  • Page 8: Refrigerant R410A

    2. REFRIGERANT R410A This air conditioner adopts the new refrigerant HFC (5) After completion of installation work, check to (R410A) which does not damage the ozone layer. make sure that there is no refrigeration gas leakage. The working pressure of the new refrigerant R410A is 1,6 times higher than conventional refrigerant If the refrigerant gas leaks into the room, coming (R22).
  • Page 9 Table 2-2-1 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 b) Socket Joints For copper pipes, flare joints or socket joints are Socket joints are such that they are brazed used.
  • Page 10 c) Insertion of Flare Nut Flare processing dimensions differ according to the type of flare tool. When using a con- d) Flare Processing ventional flare tool, be sure to secure “dimen- Make certain that a clamp bar and copper sion A” by using a gauge for size adjustment. pipe have been cleaned.
  • Page 11 Table 2-2-6 Flare and flare nut dimensions for R22 Dimension (mm) Flare nut Nominal Outer diameter Thickness width diameter (mm) (mm) (mm) 6,35 9,52 13,0 13,5 12,70 16,2 16,0 12,9 15,88 19,4 19,0 16,0 19,05 23,3 24,0 19,2 Fig. 2-2-2 Relations between flare nut and flare seal surface (2) Flare Connecting Procedures and Precautions When it is strong, the flare nut may crack and may be made non-removable.
  • Page 12 2-3. Tools 2-3-1. Required Tools The service port diameter of packed valve of the outdoor unit in the air conditioner 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

    2-4. 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 Connect the charge hose to packed valve service...
  • Page 14 Be sure to make setting so that liquid can be charged. 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 (2) Characteristics required for flux 2-5-3. Brazing • Activated temperature of flux coincides with As brazing work requires sophisticated techniques, the brazing temperature. experiences based upon a theoretical knowledge, it • Due to a wide effective temperature range, must be performed by a person qualified. flux is hard to carbonize.

  • Page 16: Construction Views

    3. CONSTRUCTION VIEWS 3-1. Indoor Unit RAS-M10YKV-E, RAS-M13YKV-E RAS-M10YKCV-E, RAS-M13YKCV-E Heat exchanger Air inlet Air filter @@@@@@@@ PPPPPPPP @@@@@@@@ PPPPPPPP @@@@@@@@ PPPPPPPP @@@@@@@@ PPPPPPPP Air outlet Knock out system Front panel Hanger Back body Drain hose (0,54m) Knock out system...

  • Page 17: Outdoor Unit

    3-2. Outdoor Unit A leg part ø11 × 17U-shape hole RAS-M18YAV-E ø25 drain hole (For ø8-ø10 anchor bolt) RAS-M18YACV-E 8-ø6 hole (For fixing outdoor unit) B leg part ø11 × 17 long hole (For ø8-ø10 anchor bolt) ø4,5 embossing (ø4STS used) (For sunshade roof attaching) Valve cover Fan guard...

  • Page 18: Wiring Diagram

    4. WIRING DIAGRAM FAN MOTOR 4-1. Indoor Unit LOUVER RAS-M10YKV-E, RAS-M13YKV-E MOTOR DC MOTOR RAS-M10YKCV-E, RAS-M13YKCV-E 6 5 4 3 2 1 4 3 2 6 5 4 3 2 1 CN07 CN10 R109 VARISTOR R116 IC04 SG01 DSA T6,3A 250V...
  • Page 19 4-2. Outdoor Unit RAS-M18YAV-E POWER SUPPLY INDOOR INDOOR 220–230–240V~ UNIT UNIT 50/60Hz FAN MOTOR REACTOR ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 4 way 1 2 3 1 2 3 valve THERMOSTAT for COMPRESSOR CN01 CN301 CN300 SURGE CN701...
  • Page 20 RAS-M18YACV-E POWER SUPPLY INDOOR INDOOR 220–230–240V~ UNIT UNIT 50/60Hz FAN MOTOR ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 1 2 3 1 2 3 REACTOR THERMOSTAT for COMPRESSOR CN301 CN300 SURGE CN701 REACTOR ABSORBER CN08 P.C. BOARD MCC-758 FUSE CN02...

  • Page 21: Specifications Of Electrical Parts

    5. SPECIFICATIONS OF ELECTRICAL PARTS 5-1. Indoor Unit RAS-M10YKV-E, RAS-M13YKV-E / RAS-M10YKCV-E, RAS-M13YKCV-E Parts name Type Specifications Fan motor (for indoor) TICF-35-19-4 DC35V, 19W Thermo. sensor (TA-sensor) ( – ) 10kΩ at 25°C DC-DC transformer (T01) SWT-34 or SWT-46 DC390V, Secondary DC35V, 12V, 7V...

  • Page 22: Refrigerant Cycle Diagram

    6. REFRIGERANT CYCLE DIAGRAM 6-1. Refrigerant Cycle Diagram RAS-M10YKV-E, RAS-M13YKV-E Temp. measurement INDOOR UNIT RAS-M18YAV-E Indoor heat To B room To B room exchanger Cross flow fan Per 1 unit Max. : 20m Deoxidized copper pipe Pressure measurement Total : 30m...
  • Page 23 RAS-M10YKCV-E, RAS-M13YKCV-E RAS-M18YACV-E Temp. measurement INDOOR UNIT Indoor heat To B room To B room exchanger Cross flow fan Per 1 unit Max. : 20m Deoxidized copper pipe Pressure measurement Total : 30m Both A and B rooms Gauge attaching port Outer dia.

  • Page 24: Operation Data

    6-2. Operation Data <Cooling> Temperature Operating combination Heat exchanger No. of Standard Indoor Outdoor Compressor condition (°C) (Unit) pipe temp. operating pressure revolution units P (MPa) mode mode (rps) Indoor Outdoor T1 (°C) T2 (°C) M13YKCV-E 0,7 to 0,9 9 to 11 46 to 48 High High M13YKV-E...

  • Page 25: Control Block Diagram

    Louver ON/OFF Signal Remote Control Louver Noise Filter Louver Driver Motor Serial Signal Transmitter/Receiver From Outdoor Unit Serial Signal Communication REMOTE CONTROL RAS-M10YKV-E, RAS-M13YKV-E RAS-M10YKCV-E, RAS-M13YKCV-E (Heat pump model) (Cooling only model) Infrared Infrared Rays Rays Remote Control Remote Control Operation (START/STOP)
  • Page 26 7-2. Outdoor Unit (Inverter Assembly) RAS-M18YAV-E CONTROL BLOK DIAGRAM (Outdoor unit) 220–230–240 V ~ 50 Hz MCC-775 (SUB P.C.B) MCC-758 (MAIN P.C.B) A unit B unit Rotor position M.C.U send/receive send/receive detect circuit circuit circuit • PWM synthesis function Rotor position •...
  • Page 27 RAS-M18YACV-E CONTROL BLOK DIAGRAM (Outdoor unit) 220–230–240 V ~ 50 Hz MCC-775 (SUB P.C.B) MCC-758 (MAIN P.C.B) A unit B unit Rotor position M.C.U send/receive send/receive detect circuit circuit circuit • PWM synthesis function Rotor position • Input current release control detect circuit •...

  • Page 28: Operation Description

    8. OPERATION DESCRIPTION 8-1. Outline of Air Conditioner Control (1) Role of indoor unit controller The indoor unit controller judges the operation This air conditioner is a capacity-variable type air commands from the remote control and as- conditioner, which uses DC motor for the indoor fan sumes the following functions.
  • Page 29 (3) Contents of operation command signal (Serial 8-1-1. Capacity Control signal) from indoor unit controller to outdoor unit The cooling capacity is varied by changing compres- controller sor motor speed. The inverter changes compressor The following three types of signals are sent motor speed by changing AC 220–230–240V power from the indoor unit controller.
  • Page 30 8-1-4. Prevent-Freezing Control 8-1-6. Louver Control The indoor heat exchanger sensor detects refriger- (1) Vertical air flow louvers ant vapor temperature in COOL/DRY operation. If Positions of vertical air flow louvers are auto- the temperature is below the specified value, com- matically controlled according to the operation pressor motor speed is reduced so that operation is status (AUTO, COOL, DRY, HEAT).
  • Page 31 8-1-8. Outdoor Fan Control (DC Fan Motor) Although the outdoor fan motor drives the outdoor fan by non-step variable system of the revolution speed, the revolution speed is restricted to three steps on the convenience of controlling. If a strong wind is lashing outside of the room, the operation may be continued as the outdoor fan stops in order to protect the outdoor fan motor.
  • Page 32 8-2-2. Cooling Operation (1) Cooling capacity control (The Remote Control MODE Button is • The cooling capacity and room temperature Set to the COOL Position) are controlled by changing the compressor motor speed according to both the difference • Once the setting is made, the operation mode is between the temperature detected by the memorized in the microcomputer so that the room temperature sensor and the temperature...
  • Page 33 (5) Limit for maximum compressor motor speed (7) Discharge temperature control by indoor fan speed (Common control to cooling and heating) When outdoor temperature sensor detected The discharge temperature of refrigerant gas 32°C or lower, and indoor heat exchanger from the compressor is detected by the dis- sensor detected 17°C or lower, the maximum charge temperature sensor, and controls operat- compressor motor speed is limited by the indoor...
  • Page 34 (8) ECONO. operation control 2) Setting M10 at 23,3 rps and M13 at 26,3 rps as the maximum operating compressor motor When the ECONO. button of the remote control speed, the minimum capacity operation range is pushed, quiet and mild operation is performed is widened every 1 hour and 2 hours have by restraining air flow and operating motor passed after ECONO.
  • Page 35 8-2-4. Heating Operation [In starting and in stability] Transferring of heating operation signal from indoor In starting In stability unit to outdoor unit starts. • Until 12 minutes • When 12 to 25 The indoor fan motor operates by the room tempera- passed after minutes passed ture when selecting “AUTO”...
  • Page 36 2) Defrost operation Operation of the compressor is stopped once, turn off power coupler for four-way valve after 10 seconds, and then exchange the four-way valve. 10,7A 16,0 After 10 seconds, restart operation of the 15,5 compressor. Turn off the outdoor fan just 12,0A 11,0 when the compressor stopped.

  • Page 37: Temporary Operation

    8-2-5. Automatic Operation 8-3. Temporary Operation (1) As shown in Fig. 8-2-10, the operation mode • Temporary Auto operation, existence of Auto (COOL, DRY, HEAT) is selected according to the Restart, and Temporary Cooling operation can be outside temperature when the operation has set by the TEMPORARY button of the indoor started.
  • Page 38 8-4. Auto Restart Function 8-4-1. How to Set the Auto Restart To set the Auto Restart function, proceed as follows: This unit is equipped with an Automatic restarting facility which allows the unit to restart and resume Access the TEMPORARY button located in the lower the set operating conditions in the event of a power right hand corner beneath the hinged front panel of supply shutdown without the use of the hand control.
  • Page 39 8-4-2. How to Cancel the Auto Restart The system will now be required to manually restart with the remote control after the main supply is To cancel the Auto Restart function, proceed as turned off. follows: Cancellation is carried out: Repeat the setting procedure: the unit will acknowledge the instruction and beep three times.

  • Page 40: Remote Control

    8-5. Remote Control 8-5-1. Parts Name of Remote Control Transmitter MODE TEMP. AUTO AUTO COOL ˚C MED. Hr.ON OFF TIMER FAN ONLY HIGH TEMP. (Temperature) buttons Push this button to set a desired START/STOP button TEMP. temperature. Push this button to start/stop the air conditioner.

  • Page 41: Installation Procedure

    9. INSTALLATION PROCEDURE • DO NOT DEFORM OR SMASH ON THE SURFACE OF THE CABLES. DO NOT PRESS OR FIX THE CORD AND CABLES FIRMLY WITH STAPLES, etc. • DO NOT USE THE INTER-CONNECTING CABLE. NEVER EXECUTE THE CONNECTION OF 9-1.
  • Page 42 9-2. Indoor Unit 9-2-2. Installation Place 9-2-3. Cutting a Hole and Mounting For the rear left and left piping Installation Plate • A place which provides the spaces around the indoor unit as shown in the installation diagram. Wall Cutting a Hole Hanger •...
  • Page 43 • When the installation plate is directly 9-2-4. Wiring Connection 9-2-5. Piping and Drain Hose Installation NOTE : mounted on the wall If the pipe is bent incorrectly, the indoor unit may How to connect the inter-connect cable In case of rightward piping 1.
  • Page 44 9-2-6. Drainage 9-2-8. Setting of Remote Control Screws How to open the screw cap Selector Switch 1. Run the drain hose sloping downwards. When two indoor units are installed in the • Hole should be made at a slight downward separated rooms, there is no need to change slant to the outdoor side.
  • Page 45 2. Setting of remote control selector at the 9-2-9. Check and Test Operation 9-3. Outdoor Unit 9-3-2. Refrigerant Piping remote control side 1. Check the unit is firmly hooked up on the • Piping kit used for the conventional refrigerant 9-3-1.
  • Page 46 9-3-4. Optional Installation Parts • Projection margin in flaring : B (Unit : mm) • Total piping length : Two room Multi (A + B) Fixing bolt arrangement of outdoor unit = 30 m or less (Local Supply) Rigid (Clutch type) •...
  • Page 47 9-3-8. Evacuating Tightening connection Packed valve handling precautions How to wiring connection After the piping has been connected to all indoor Align the centers of the connecting pipes and • Open the valve stem all the way out; so not try 1.
  • Page 48 9-3-10. Check and Test Operation 9-3-11. MISWIRING (MISPIPING) CHECK 9-3-13. Installation/Servicing Tools Changes in the product and components Make sure that the wiring and piping for each In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being For R410A, use the leak detector exclusively room have the same alphabetical code (A, B, C).

  • Page 49: How To Diagnose The Trouble

    10. HOW TO DIAGNOSE THE TROUBLE The pulse modulating circuits are mounted to both NOTE : indoor and outdoor units. Therefore, diagnose A large-capacity electrolytic capacitor is used in the troubles according to the trouble diagnosis proce- outdoor unit controller (inverter). Therefore, if the dure as described below.
  • Page 50 10-1-3. Operation Which is not a Trouble (Program Operation) For controlling the air conditioner, the program operations are built in the microcomputer as described in the following table. If a claim is made for running operation, check whether or not it meets to the contents in the following table.

  • Page 51: Judgment By Flashing Led Of Indoor Unit

    10-3. Judgment by Flashing LED of Indoor Unit While the indoor unit monitors the operation status of the air conditioner, if the protective circuit operates, the contents of self-diagnosis are displayed with block on the indoor unit indication section. Table 10-3-1 Check Item Block display...
  • Page 52 10-4. Self-Diagnosis by Remote Control (Check Code) (1) The self-diagnosis by the check code is performed while items B to E blocks are displayed. (2) When turning the operation mode on the remote control to the service mode, and operating the remote control, the controller of the indoor unit can self-diagnose operation of the protection circuit by displayed contents (check code) on the remote control, by whether all the lamps flash (5Hz) and the receiving sound (Pi, Pi, Pi ...
  • Page 53 10-4-3. Caution at Servicing (1) After servicing, push the START/STOP button to return to the normal mode. (2) After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power supply again so that memory in the microcomputer returns the initial status. However, the check codes are not deleted even if the power supply is turned off because they are stored in the fixed memory.
  • Page 54 Block distinction Operation of diagnosis function Judgment and action Check Check Block Cause of operation conditioner Remarkes code code status Outdoor P.C. Inverter over-current All off Displayed when Even if trying operation again, all board protective circuit operates. error is detected. operations stop immediately.

  • Page 55: Judgment Of Trouble By Every Symptom

    10-5. Judgment of Trouble by Every Symptom 10-5-1. Indoor Unit (Including Remote Control) Operation (1) Power is not turned on (Does not operate entirely) Check Item Turn off the power supply Considerable main cause once, and turn on it again after 5 seconds passed.
  • Page 56 (3) Only the indoor fan does not operate Operation Check Item Turn off the power supply. Considerable main cause Measures Turn on the power supply. Item by symptom Does the fan Replace the board. stop in no operating Control board is defective. status? Start the operation with low fan setting...
  • Page 57 (4) Indoor fan motor starts rotating by turning on power supply alone (Operation may be normally performed (selected) by operation on the remote control.) <Cause> IC is built in the indoor fan motor, therefore P.C. board is also mounted to inside of the motor. If soldering of P.C.
  • Page 58 (5) How to examine whether remote control is good or bad • Does setting (A/B) of the remote control selection match with that at indoor unit? Operation Check Items There is no beep from the indoor unit. Push the START/STOP button. Considerable main cause The operation lamp of the air conditioner main...
  • Page 59 10-5-2. 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 to outdoor is correctly performed based upon the following dia- gram.
  • Page 60 10-6. Check Code 1C (Miswiring in indoor/outdoor units, disconnection of TGa sensor) and 1E <Check procedure> Disconnection of Miswiring in indoor/outdoor Discharge temp. error, Operation TGa sensor, units, gas leakage, gas leakage P.M.V. sensor error disconnection of TS/TC (Check code 03, 1E) (Check code 02, 1C) sensors (Check code 02, 1C) Check Item...
  • Page 61 10-7. Trouble Diagnosis by Outdoor LED Wiring port For the outdoor unit, the self-diagnosis is possible by five LEDs (Red). • LEDs (Red) (D11 to D15) are provided on the sub-control board under surface of the inverter, and as shown below, they are checked from the wiring port when removing the wiring cover.

  • Page 62: How To Diagnose Trouble In Outdoor Unit

    10-8. How to Diagnose Trouble in Outdoor Unit 10-8-1. Summarized Inner Diagnosis of Inverter Assembly Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power breaker, and remove 3P connector Remove connector of which connects inverter and compressor. compressor. If fuse was blown, be sure to Check •...
  • Page 63 Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compres- sor, and resistance between outdoor frames by using a tester. → → → → → OK if 10MΩ or more • Is not grounded. Check  winding of •...
  • Page 64 (3) Check procedures Table 10-9-1 Procedure Check point (Symptom) Causes Shut off the power supply and 1. Is the fuse blown? 1. * Application of shock voltage. remove the P.C. board assembly * Overload by short-circuit of the from the electronic parts base. parts.
  • Page 65 10-9-2. P.C. Board Layout Bottom View (For the Top View, refer to page 71.) [1] Sensor characteristic table Heat pump model Cooling only model TD : Discharge temp. sensor TGa : Gas side temp. sensor TA : Room temp. sensor TC : Heat exchanger temp.
  • Page 66 10-9-3. 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 Remote control...
  • Page 67 10-9-5. Checking Method for Each Part Part name Checking procedure Electrolytic capacitor 1. Turn OFF the power supply breaker. (For raising pressure, 2. Discharge all four capacitors completely. smoothing) 3. Check that safety valve at the bottom of capacitor is not broken. 4.

  • Page 68: How To Simply Judge Whether Outdoor Fan Motor Is Good Or Bad

    10-10. 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 control check code “02 : Outdoor block, 1A : Outdoor fan drive system error”...

  • Page 69: How To Replace The Main Parts

    11. HOW TO REPLACE THE MAIN PARTS 11-1. Indoor Unit Part name Procedure Remarks Front panel 1) After stopping the operation of the air conditioner, be sure to turn off the circuit breaker or disconnect the power plug from the AC wall socket. 2) Open the screw caps and remove the two screws fixing the front panel.
  • Page 70 Part name Procedure Remarks Horizontal grille 1) Perform the process Note: 2) Remove the screw fixing the louver motor, and remove the louver motor. The horizontal grille can not be 3) Remove the shaft of the horizontal grille from the removed without drain-pan.
  • Page 71 11-2. Microcomputer Part name Procedure Remarks Common 1) Turn the power supply off to stop the operation of air- Replace the thermal fuse, terminal procedure conditioner. block, microcomputer ass’y and the P.C. board ass’y. 2) Remove the front panel. • Remove the two fixing screws. (φ4 x 14 ) 3) Remove the electrical part base.
  • Page 72 11-3. Outdoor Unit RAS-M18YACV-E / RAS-M18YAV-E Part name Procedure Remarks Common 1. Detachment 1) Stop operation of the air conditioner, and remove Upper cabinet procedure the power plug of the indoor unit from plug socket. Wiring 2) Remove the valve cover. (ST1TØ4 x 10 1 pc.) cover •...
  • Page 73 Part name Procedure Remarks Inverter 1. Detachment Inverter cover P . C. board assembly 1) Perform work of item 1 of (Soldered surface) 2) Remove screw (ST1TØ4 x 10 1 pc.) of the upper part of the front cabinet. • If removing the inverter cover in this condition, P.C.
  • Page 74 Part name Procedure Remarks Control board 1) Disconnect lead wires and connectors connected assembly from the control board assembly to other parts. 1. Lead wires • Connection with terminal block : 5 wires (Black, Orange, Red, Two white wires) • Connection with compressor : Remove the connector (3P).
  • Page 75 Part name Procedure Remarks Fan motor 1) Perform work of item 1 of 2) Remove the flange nut fixing the fan motor and Fan motor the propeller. • Flange nut is loosened by turning clockwise. Propeller fan (To tighten the flange nut, turn counterclock- wise.) 3) Remove the propeller fan.
  • Page 76 Part name Procedure Remarks Pulse 1. Detachment modulating 1) Perform work of item 1 of , and valve coil 2) Turn the coil clockwise (counterclockwise) by 90 degrees, and remove coil from the pulse modu- lating valve. 2. Attachment Take-out part 1) Set take-out part of the lead wire of coil to the of lead wire coil inserting position of the pulse modulating...
  • Page 77 Part name Procedure Remarks Replacement 1) Cut the sensor 100 mm longer than old one. of temperature 2) Cut the protective tube after pulling out it sensor for (200 mm). Cutting here Thermal servicing only 3) Move the protective tube toward the thermal Connector sensor part sensor side and tear the tip of lead wire in...
  • Page 78 MCC-758 – 78 –...
  • Page 79 MCC-775 – 79 –...

  • Page 80: Exploded Views And Parts List

    12. EXPLODED VIEWS AND PARTS LIST 12-1. Indoor Unit (1) RAS-M10, M13YKV-E RAS-M10, M13YKCV-E 407 : RAS-M10YKCV-E 408 : RAS-M13YKCV-E 409 : RAS-M13YKV-E 410 : RAS-M10YKV-E Location Part Location Part Description Description 43T60002 Terminal Block, 3P, 43T69047 P.C. Board Assembly,...
  • Page 81 Indoor Unit (2) Location Part Location Part Description Description 43T00043 Front Panel Assembly 43T49003 Spring 43T00044 Grille, Suction 43T49028 Plate, EVA-SEAL 43T80001 Air Filter (L) 43T49023 Holder of Plate of EVA-SEAL 43T80002 Air Filter (R) 43T79002 Drain Guide 43T07021 Screw Cap (L) 43T39002 Motor Band (Left) 43T07020 Screw Cap (R) 43T39001 Motor Band (Right)
  • Page 82 12-2. Outdoor Unit 17, 18 11, 13 12, 14 24, 25 15, 16 Location Part Location Part Description Description 43005368 Cabinet, Back, Assembly 43046347 Coil, P.M.V. 43005369 Cabinet, Upper, Assembly 43058264 Reactor 43005401 Cabinet, Front, Assembly 43050298 Thermo. Bimetal, CS-7 4301V030 Guard, Fan 4302C019 Motor, Fan, DC 43042461 Base, Assembly...
  • Page 83 12-3. P.C. Board Layout RAS-M18YAV-E / RAS-M18YACV-E TO Sensor TE Sensor (Ø6) TS Sensor TGa Sensor (Ø4) TD Sensor (Ø4) Heat pump model TO Sensor TS Sensor TGa Sensor TD Sensor Cooling model Location Part Location Part Description Description 43050382 Sensor, TC (Ø6) 4306S180 P.C.

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