Toshiba RAS-18N3KCV Service Manual
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Toshiba RAS-18N3KCV Service Manual

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FILE NO. SVM-12053

SERVICE MANUAL

AIR-CONDITIONER
SPLIT TYPE
Indoor Unit
RAS-18N3KCV
Outdoor Unit
RAS-18N3ACV
R410A
Sep, 2012
Table of Contents
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Summary of Contents for Toshiba RAS-18N3KCV

  • Page 1: Service Manual

    FILE NO. SVM-12053 SERVICE MANUAL AIR-CONDITIONER SPLIT TYPE Indoor Unit RAS-18N3KCV Outdoor Unit RAS-18N3ACV R410A Sep, 2012...

  • Page 2: Table Of Contents

    FILE NO. SVM-12053 CONTENTS 1. SAFETY PRECAUTIONS ................2 2. SPECIFICATIONS ..................4 3. REFRIGERANT R410A ................6 4. CONSTRUCTION VIEWS ................ 14 5. WIRING DIAGRAM .................. 16 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 17 7. REFRIGERANT CYCLE DIAGRAM ............18 8.

  • Page 3: Safety Precautions

    FILE NO. SVM-12053 1. SAFETY PRECAUTIONS For general public use Power supply cord of outdoor unit shall be more than 1.5 mm ² (H07RN-F or 60245IEC66) polychloroprene sheathed flexible cord. • Read this “SAFETY PRECAUTIONS” carefully before servicing. • The precautions described below include the important items regarding safety. Observe them without fail. •...
  • Page 4 FILE NO. SVM-12053 • DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION. • TO PREVENT THE INDOOR UNIT FROM OVERHEATING AND CAUSING A FIRE HAZARD, PLACE THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS, FURNACE, STOVES, ETC.

  • Page 5: Specifications

    (°C) -10~46 Accessory Indoor unit Installation plate Wireless remote controller Batteries Remote controller holder Toshiba New IAQ filter Mounting screw 6(∅4x25L) Remote controller holder 2(∅3.1Lx16L) Pan head wood screw Installation manual Owner's manual * The specifications may be subject to change without notice for purpose of improvement.

  • Page 6: Operation Characteristic Curve

    FILE NO. SVM-12053 2-2. Operation Characteristic Curve (RAS-18N3KCV/RAS-18N3ACV) 12.00 11.00 10.00 9.00 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 100 110 120 Compressor Speed (RPS) 2-3. Capacity Variation Ratio According to Temperature Condition Indoor: DB27°C/WB19°C Indoor Air-Flow Volume: High Pipe Length: 7.5m...

  • Page 7: Refrigerant R410A

    FILE NO. SVM-12053 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 8 FILE NO. SVM-12053 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 9 FILE NO. SVM-12053 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 10 FILE NO. SVM-12053 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 11 FILE NO. SVM-12053 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 12: Recharging Of Refrigerant

    FILE NO. SVM-12053 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 13: Brazing Of Pipes

    FILE NO. SVM-12053 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 14 FILE NO. SVM-12053 2. Characteristics required for flux 3-5-3. Brazing • Activated temperature of flux coincides with As brazing work requires sophisticated techniques, the brazing temperature. experiences based upon a theoretical knowledge, it must be performed by a person qualified. •...

  • Page 15: Construction Views

    FILE NO. SVM-12053 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 16 FILE NO. SVM-12053 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 17: Wiring Diagram

    FILE NO. SVM-12053 5. WIRING DIAGRAM COMPRESSOR CN300 Q200~205 Q300~305 IGBT MOS-FET P.C.BOARD R221 (MCC-5009) R321 FAN MOTOR R220 R320 CN700 R219 R319 PULSE MOTOR VALVE FUSE VARISTOR T3.15A AC250V DB01 CN603 SURGE (SUCTION PIPE TEMP. SENSOR) ABSORBER CN602 POWER VARISTOR RELAY (OUTDOOR...

  • Page 18: Specifications Of Electrical Parts

    FILE NO. SVM-12053 6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specifications Fan motor (18N3KCV) AFS-220-31-4B AC 220V, 31W (for indoor) Room temp. sensor (TA-sensor) ( — ) 10kΩ at 25°C Heat exchanger temp. sensor (TC-sensor) ( — ) 10kΩ...

  • Page 19: Refrigerant Cycle Diagram

    FILE NO. SVM-12053 7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Outer dia. : 6.35mm Charge : 20g/m Vacuum pump connecting port (16 to 20m)

  • Page 20: Operation Data

    FILE NO. SVM-12053 7-2. Operation Data Compressor Tempeature Heat exchanger Standard condition (°C) pipe temp. pressure Indoor Outdoor revolution P (MPa) fan mode fan mode Indoor Outdoor T1 (°C) (rps) 0.9 to 1.1 27/19 35/- 9 to 12 High High NOTES : 1.

  • Page 21: Control Block Diagram

    FILE NO. SVM-12053 8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit Indoor Unit Control Unit 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 22 FILE NO. SVM-12053 8-2. Outdoor Unit (Inverter Assembly) – 21 –...

  • Page 23: Operation Description

    FILE NO. SVM-12053 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. Its system can control the speed of to IGBT module (Compressor stop function) compressor motor according to load.
  • Page 24 FILE NO. SVM-12053 9-2. Operation Description 1. Basic operation ......................24 1. Operation control ....................24 2. Cooling operation ....................25 3. AUTO operation ..................... 25 4. DRY operation ......................25 2. Indoor fan motor control ..................... 26 3. Outdoor fan motor control ................... 27 4.

  • Page 25: Operation Description

    FILE NO. SVM-12053 9-2. Operation Description 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 26: Cooling Operation

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 1. Basic 2. Cooling operation operation The operations are performed in the following parts by controls according to cooling conditions. 1) Receiving the operation ON signal of the remote controller, the cooling operation signal starts being transferred form the indoor controller to the outdoor unit.

  • Page 27: 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-18N3KCV Fan speed COOL level Fan speed Air flow rate (rpm) (m3/h)

  • Page 28: Outdoor Fan Motor Control

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 3. Outdoor fan The speed of the outdoor unit side is controlled according 1) The operation command sent motor control from the remote controller is to speed of compressor motor (rps) and outdoor processed by the indoor unit temperature (To).

  • Page 29: Capacity Control

    FILE NO. SVM- 12053 Item Operation flow and applicable data, etc. Description 4. Capacity The cooling capacity depending on the load is adjusted. 1) The difference between set control temperature on remote controller According to difference between the setup value of tempera- (Ts) and room temperature (Ta) ture and the room temperature, the capacity is adjusted by is calculated.

  • Page 30: Release Protective Control By Temperature Of Indoor Heat Exchanger

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 1) When temperature of 6. Release the indoor heat exchanger protective (Prevent-freezing control for indoor heat exchanger) drops below 5°C, the control by In cooling/dry operation, the sensor of indoor heat compressor speed is temperature exchanger detects evaporation temperature and...

  • Page 31: Temporary Operation

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 8. Temporary Pressing [RESET] button starts the temporary opera- 1) When pressing [RESET] button, the operation tion of [AUTO] operation. When keeping [RESET] temporary [AUTO] operation starts. button pressed for 10 seconds or more, the temporary 2) When keeping [RESET] button pressed [COOL] operation is performed.

  • Page 32: Pulse Modulating Valve (P .M.v.) Control

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 10. Pulse This function controls throttle amount of the 1) When starting the operation, move the Modulating refrigerant in the refrigerating cycle. valve once until it fits to the stopper. valve (P.M.V.) (Initialize) According to operating status of the air conditioner,...

  • Page 33: Self-Cleaning Function

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 11. Self-Cleaning 1. Purpose The Self-Cleaning operation is to minimize the function 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 34 FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 11. Self-Cleaning • Self-Cleaning diagram function Operation display FCU fan rpm is depend on presetting. (500RPM) OPEN (12.7º) FCU louver OPEN CLOSE ON or OFF ON or OFF Timer display depend on presetting of timer function.

  • Page 35: Remote-A Or B Selection

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description J201 PCB NO : WP-020 12. Remote-A or B Setting the remote controller 1. Purpose selection To separate using of remote control for each indoor This operation is to operate only one indoor unit using one remote controller.

  • Page 36: Quiet Mode

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 13. QUIET mode When the [QUIET] button is pressed, the fan of the Quiet mode is the system which, control the revolving speed of indoor fan to work indoor unit will be restricted the revolving speed at −...

  • Page 37: One-Touch Comfort

    FILE NO. SVM-12053 Item Operation flow and applicable data, etc. Description 16. One-Touch One touch comfort is the fully automated operation When an indoor unit receives "One Touch Comfort that is set according to the preferable condition in Comfort Signal" from the remote controller, a region.

  • Page 38: Auto Restart Function

    FILE NO. SVM-12053 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 39: How To Cancel The Auto Restart Function

    FILE NO. SVM-12053 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 40: Remote Control

    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 ONE-TOUCH : Start the operaton.
  • Page 41 FILE NO. SVM-12053 4. DRY OPERATION (COOLING ONLY) For dehumidification, a moderate cooling performance is controlled automatically. 1. Press MODE : Select Dry 2. Press TEMP : 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 42 FILE NO. SVM-12053 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 PRESET for 3 seconds to memorize the setting. The mark displays.

  • Page 43: Name And Functions Of Indications On Remote Controller

    FILE NO. SVM-12053 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. 1. Transmission mark 5. TIMER and clock time indicator This transmission mark indicates when the The time setting for timer operation or the clock remote controller transmits signals to the indoor time is indicated.

  • Page 44: Installation Procedure

    FILE NO. SVM-12053 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 45 FILE NO. SVM-12053 10-2. Installation 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 108 mm 125 mm 28 mm...
  • Page 46 FILE NO. SVM-12053 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 ∅3.1 x 16 s x 2 Installation plate x 1 Remote control holder x 1 Flat head wood screw ∅3.1 x 25 s x 1 Filter x 1 Wireless remote control x 1...
  • Page 47 FILE NO. SVM-12053 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 acciden- tally, the service port diameter of the outdoor unit control valve (3-way valve) has been changed. (1/2 UNF 20 threads per inch) •...
  • Page 48 FILE NO. SVM-12053 10-3. Indoor Unit 10-3-2. Drilling a Hole and Mounting Installation Plate 10-3-1. Installation Place • A place which provides enough spaces around the indoor unit as shown in the diagram. When install the refrigerant pipes from the rear. •...
  • Page 49 FILE NO. SVM-12053 10-3-3. Wiring Connection 1. Securely fit the installation plate onto the wall by screwing it in the upper and lower parts to hook up the indoor unit.
  • Page 50 FILE NO. SVM-12053 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 51: Piping And Drain Hose Installation

    FILE NO. SVM-12053 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 52 FILE NO. SVM-12053 1. Insert hexagon wrench (4 mm) in a center head. • After scribing slits on the front panel with a knife or a making-off pin, cut them with a pair of nippers or an equivalent tool.

  • Page 53: Indoor Unit Fixing

    FILE NO. SVM-12053 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 screws In case of leftward piping and rear-leftward trovided to fix the unit and the installation plate.

  • Page 54: Refrigerant Piping Connection

    FILE NO. SVM-12053 10-4. Outdoor Unit 10-4-2. Refrigerant piping connection 10-4-1. Installation Place • A place which provides enough space around the outdoor unit as shown in the diagram. 1. Cut the pipe with a pipe cutter. • A place which can bear the weight of the outdoor unit and does not allow an increase in noise level Roughness Warp...
  • Page 55 FILE NO. SVM-12053 CAUTION • Do not apply excess torque. Otherwise, the Be sure to use a vacuum pump with counter-flow nut may crack depending on the conditions. prevention function so that oil inside the pump does not flow backward into pipes of the air conditioner (Unit : N·m) when the pump stops.

  • Page 56: Wiring Connection

    FILE NO. SVM-12053 10-4-4. Wiring connection CAUTION 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 57 FILE NO. SVM-12053 10-5. Others 1 2 3 10-5-1. Gas leak test Check places for indoor unit (Flarenut connection) Earth line Earth line Power cord Connecting cable Electric parts Fig. 10-4-9 cover 18 Class Model 220-240V, 50Hz Single phase, Power source 220-230V, 60Hz Single phase Check places Maximum...
  • Page 58 FILE NO. SVM-12053 NOTE : 1. Repeat above step to reset Remote Control to be A. 2. Remote Control A has not "A" display. 3. Default setting of Remote Control from factory is A. F ig. 10-5-2 10-5-3. Test operation To switch the TEST RUN (COOL) mode, press [RESET] button for 10 sec.

  • Page 59: How To Diagnose The Trouble

    FILE NO. SVM-12053 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 60 FILE NO. SVM-12053 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 61: First Confirmation

    FILE NO. SVM-12053 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 62: Primary Judgment

    FILE NO. SVM-12053 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 63 FILE NO. SVM-12053 11-4. Self-Diagnosis by Remote Controller (Check Code) 1. If the lamps are indicated as shown B to E in Table 11-3-1, execute the self-diagnosis by the remote controller. 2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condition and indicates the information of the self-diagnosis on the display of the remote controller with the check codes.
  • Page 64 FILE NO. SVM-12053 Table 11-4-1 Block level Diagnosis function Judgement and action Check Check Unit Block Symptom Condition code code status Indoor The indoor thermo sensor (TA) is Operation The lamp on the 1. Check the indoor thermo sensor (TA). P.C.

  • Page 65: Judgment Of Trouble By Every Symptom

    FILE NO. SVM-12053 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) 1. Is the supply voltage normal? 2. Is the normal voltage provided to the outdoor unit? 3.
  • Page 66 FILE NO. SVM-12053 (3) Only the indoor motor fan does not operate 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 67 FILE NO. SVM-12053 (4) Indoor fan motor automatically starts to rotate by turning on power supply [For DC fan motor] 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.
  • Page 68 FILE NO. SVM-12053 (5) Troubleshooting for remote controller 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 69 FILE NO. SVM-12053 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 following diagram.
  • Page 70 FILE NO. SVM-12053 11-6. Check Code 1C and 1E Gas leakage, disconnection of TS/TC sensors Discharge temp. error, gas leakage (Check code 02, 1C) (Check code 03, 1E) Valve drive check Is coil of the pulse motor valve Set it correctly.

  • Page 71: How To Diagnose Trouble In Outdoor Unit

    FILE NO. SVM-12053 11-7. How to Diagnose Trouble in Outdoor Unit 11-7-1. Summarized Inner Diagnosis of Inverter Assembly Table 11-7-1 Diagnosis/Process flowchart Item Contents Summary Preparation Turn “OFF” the power supply breaker, and remove 3P Remove connector connector which connects of compressor.

  • Page 72: How To Check Simply The Main Parts

    FILE NO. SVM-12053 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. Replace control board assembly. ...
  • Page 73 FILE NO. SVM-12053 (3) Check procedures Table 11-8-1 Procedure Check points Causes Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the and remove the P.C. board is blown. indoor fan motor short-circuited. assembly from electronic parts base.
  • Page 74 FILE NO. SVM-12053 11-8-2. P .C . Board Layout + 5V + 12V +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, TS TS : Suction temp.
  • Page 75 FILE NO. SVM-12053 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 76 FILE NO. SVM-12053 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 77: How To Simply Judge Whether Outdoor Fan Motor Is Good Or Bad

    FILE NO. SVM-12053 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 78: How To Replace The Main Parts

    FILE NO. SVM-12053 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 79 FILE NO. SVM-12053 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 80 FILE NO. SVM-12053 Part name Procedures Remarks Electric parts ‚ 1) Remove screw of earth lead attached to the box assembly end plate of the evaporator. 2) 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 81 FILE NO. SVM-12053 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 82 FILE NO. SVM-12053 Part name Procedures Evaporator 4) Remove three fixing screw at the right (Heat exchanger) side of the heat exchanger, and separate the heat exchanger from the back body. (Figure 4, 5) One screw (Figure 4) One screw (Figure 5) Bearing 1) Follow to the procedure in the item...
  • Page 83 FILE NO. SVM-12053 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 84 FILE NO. SVM-12053 Part name Procedures Remarks Cross flow fan 1) To incorporate the fan motor incorporate the motor into the position in the following figure, and then install the fan motor. • Install the cross flow fan so that the right end of the 1st joint from the right of the cross flow fan is set keeping 5.0 mm from closed wall of the main unit.
  • Page 85 FILE NO. SVM-12053 12-2. 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 86 FILE NO. SVM-12053 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 87 FILE NO. SVM-12053 Part name Procedure Remarks  ƒ Inverter 1) Perform work of item 1 in Inverter cover assembly 2) Remove screw (ST1TØ4 × 10L 2 pcs.) of the upper part of the front cabinet. P.C. board (Soldered surface) •...
  • Page 88 FILE NO. SVM-12053 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 89 FILE NO. SVM-12053 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 90 FILE NO. SVM-12053 Part name Procedure Remarks  ‚ ƒ „ ‡ Compressor 1) Perform work of item 1 of … 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 91 FILE NO. SVM-12053 Part name Procedure Remarks 1. Detachment Electronic expansion 1) Perform step 1 in , all the steps in valve coil 1 in Coil 2) Remove the coil by pulling it up from the anti-turn electronic control valve body. lock 2.
  • Page 92 FILE NO. SVM-12053 Part name Procedure Remarks TS sensor (Suction pipe temperature sensor) • Attachment Install the senser onto the straight pipe part of the suction Arrow D pipe. Be careful for the lead direction of the sensor. TD sensor (Discharge pipe temperature sensor) •...

  • Page 93: Exploded Views And Parts List

    FILE NO. SVM-12053 13. EXPLODED VIEWS AND PARTS LIST 13-1. Indoor Unit Location Part Location Part Description Description 43T00597 FRONT PANEL ASSY 43T39020 BAND, MOTOR, LEFT 43T09471 GRILLE OF AIR INLET ASSY 43T39330 MOTOR BAND (RIGHT,UP) ASSY 43T03019 BACK BODY ASSEMBLY 43T39331 MOTOR BAND 43T80331 FILTER-AIR (RIGHT,DOWN) ASSY...

  • Page 94: File No. Svm

    FILE NO. SVM-12053 13-2. Indoor Unit (Part-E) Location Part Location Part Description Description 43T50324 SENSOR; HEAT EXCHANGER 43T6V316 PC BOARD ASSY;WRS-LED 43T60331 TERMINAL; 3P 43T69833 PC BOARD ASSY 43T69320 TEMPERATURE SENSOR 43T21434 STEPPING-MOTOR 43T62003 CORD CLAMP 43T60386 MOTOR CORD – 93–...
  • Page 95 FILE NO. SVM-12053 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 43T58309 REACTOR 43T00452 UPPER CABINET 43T20319 PROPELLER FAN 43T19329 FAN GUARD 43T21375 FAN MOTOR 43T19348 PACKED VALVE COVER 43T47001 NUT FLANGE 43T41446 COMPRESSOR...
  • Page 96 FILE NO. SVM-12053 13-4. Outdoor Unit (Part-E) Location Part Location Part Description Description 43T62320 HEATSINK 43T60377 TEMPERATURE SENSOR 43T69944 PC BOARD 43T50304 SENSOR;HEAT EXCHANGER 43T60392 TERMINAL-5P 43T62313 BASE-PLATE-PC 43T60326 FUSE – 95 –...
  • Page 97 TOSHIBA CARRIER (THAILAND) CO.,LTD.

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