Toshiba RAS-18SKV-E Service Manual
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Toshiba RAS-18SKV-E Service Manual

Split type air conditioner
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SERVICE MANUAL

Indoor Unit
<High Wall, Heat Pump Type>
RAS-18SKV-E
RAS-22SKV-E
RAS-18SKVR-E
RAS-22SKVR-E
Outdoor Unit
<Heat Pump Type>
RAS-18SAV-E
RAS-22SAV-E
R410A
FILE NO. A07-008
SPLIT TYPE
Printed in Japan, Feb., 2008

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Summary of Contents for Toshiba RAS-18SKV-E

  • Page 1: Service Manual

    FILE NO. A07-008 SERVICE MANUAL SPLIT TYPE Indoor Unit <High Wall, Heat Pump Type> RAS-18SKV-E RAS-22SKV-E RAS-18SKVR-E RAS-22SKVR-E Outdoor Unit <Heat Pump Type> RAS-18SAV-E RAS-22SAV-E R410A Printed in Japan, Feb., 2008...

  • Page 2: Table Of Contents

    CONTENTS 1. SAFETY PRECAUTIONS ................2 2. SPECIFICATIONS ..................4 3. REFRIGERANT R410A ................7 4. CONSTRUCTION VIEWS ................ 15 5. WIRING DIAGRAM .................. 18 6. SPECIFICATIONS OF ELECTRICAL PARTS ......... 19 7. REFRIGERANT CYCLE DIAGRAM ............20 8. CONTROL BLOCK DIAGRAM ..............23 9.

  • Page 3: Safety Precautions

    1. SAFETY PRECAUTIONS For general public use Power supply cord of outdoor unit shall be more than 1.5 mm (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 • 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 REGISTORS, FURNACE, STOVES, ETC.

  • Page 5: Specifications

    2. SPECIFICATIONS 2-1. Specifications RAS-18SKV-E RAS-18SKVR-E Unit model Indoor RAS-18SAV-E RAS-18SAV-E Outdoor Cooling capacity (kW) 1.1-6.0 1.1-6.0 Cooling capacity range (kW) Heating capacity (kW) 0.8-6.3 0.8-6.3 Heating capacity range (kW) 1Ph/50Hz/220-240V, 1Ph/60Hz/220-230V Power supply Electric Indoor Operation mode Cooling Heating...
  • Page 6 Unit model Indoor RAS-22SKV-E RAS-22SKVR-E Outdoor RAS-22SAV-E RAS-22SAV-E Cooling capacity (kW) Cooling capacity range (kW) 1.2-6.7 1.2-6.7 Heating capacity (kW) Heating capacity range (kW) 1.0-7.5 1.0-7.5 Power supply 1Ph/50Hz/220-240V, 1Ph/60Hz/220-230V Electric Indoor Operation mode Cooling Heating Cooling Heating characteristic Running current 0.38-0.35 0.38-0.35 0.38-0.35...

  • Page 7: Operation Characteristic Curve

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

  • Page 8: Refrigerant R410A

    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 is 1.6 times higher than conventional refrigerant...
  • Page 9 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 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 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. 3-2-2 Relations between flare nut and flare seal surface 2.
  • Page 12 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

    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 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 3-5-3. Brazing 2. Characteristics required for flux • Activated temperature of flux coincides with the As brazing work requires sophisticated techniques, brazing temperature. experiences based upon a theoretical knowledge, it must be performed by a person qualified. • Due to a wide effective temperature range, flux is hard to carbonize.

  • Page 16: Construction Views

    4. CONSTRUCTION VIEWS 4-1. Indoor Unit RAS-18SKVR-E RAS-22SKVR-E 262.5 153.5 215.5 262.5 – 15 –...
  • Page 17 4-2. Indoor Unit RAS -18SKV-E RAS -22SKV-E 262.5 153.5 215.5 262.5 – 16 –...
  • Page 18 4-3. Outdoor Unit A leg part dia.11-14U-shape hole (for dia.8-10 anchor bolt) 8-dia.7 hole (for fixing outdoor unit) dia.11x14 long hole B leg part (for dia.8-10 anchor bolt) Packed valve 69.5 147 cover dia.436 Fan guard Connecting pipe port (Pipe dia.6.35) Charging port 4-dia.4.5 embossment Connecting pipe port...

  • Page 19: Wiring Diagram

    5. WIRING DIAGRAM 5-1. RAS-18SKV-E / RAS-18SAV-E, RAS-22SKV-E / RAS-22SAV-E RAS-18SKVR-E / RAS-18SAV-E, RAS-22SKVR-E / RAS-22SAV-E COMPRESSOR Q200 205 IGBT R221 R220 R219 (SUCTION PIPE AC250V TEMP. SENSOR) CN602 POWER RELAY (OUTDOOR TEMP. SENSOR) CN601 (DISCHARGE PIPE RELAY TEMP. SENSOR)

  • Page 20: Specifications Of Electrical Parts

    6. SPECIFICATIONS OF ELECTRICAL PARTS 6-1. Indoor Unit Parts name Type Specifications Fan motor 18SKV-E, 18SKVR-E ICF-340-30-2 DC-340V,30W (for indoor) 22SKV-E, 22SKVR-E ( − ) Ω Room temp. sensor (TA-sensor) at 25°C − Heat exchanger temp. sensor (TC-sensor) 10kΩ at 25°C MP24Z3T Louver motor Output (Rated) 1W, 16 poles, DC12V...

  • Page 21: Refrigerant Cycle Diagram

    7. REFRIGERANT CYCLE DIAGRAM 7-1. Refrigerant Cycle Diagram RAS-18SKV-E / RAS-18SAV-E RAS-18SKVR-E / RAS-18SAV-E Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia.
  • Page 22 RAS-22SKV-E / RAS-22SAV-E RAS-22SKVR-E / RAS-22SAV-E Temp. measurement INDOOR UNIT Indoor heat exchanger Cross flow fan Max. : 20m Min. : 2m Pressure measurement Chargeless : 15m Deoxidized copper pipe Gauge attaching port Charge : 20g/m Outer dia. : 6.35mm Vacuum pump connecting port (16 to 20m) Thickness : 0.8mm...

  • Page 23: Operation Data

    7-2. Operation Data <Cooling> Tempeature Model name Standard Heat exchanger Indoor Outdoor Compressor condition(°C) RAS- pressure pipe temp. fan mode fan mode revolution Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps) 27/19 35/- 18SKV-E 0.9 to 1.1 11 to 13 40 to 42 High High...

  • Page 24: Control Block Diagram

    8. CONTROL BLOCK DIAGRAM 8-1. Indoor Unit RAS-18SKV-E, RAS-22SKV-E Indoor Unit Control Unit M.C.U. Louver Functions Motor Heat Exchanger Sensor (Tc) • Cold draft preventing Function Room Temperature Sensor (Ta) Louver Motor • 3-minute Delay at Restart for Compressor Drive Control Infrared Rays Signal Receiver •...
  • Page 25 RAS-18SKVR-E, RAS-22SKVR-E Indoor Unit Control Unit M.C.U. Louver Functions Motor Heat Exchanger Sensor (Tc) • Cold draft preventing Function Room Temperature Sensor (Ta) Louver Motor • 3-minute Delay at Restart for Compressor Drive Control Infrared Rays Signal Receiver • Fan Motor Starting Control and Indication Indoor Fan Motor Control...
  • Page 26 8-2. Outdoor Unit (Inverter Assembly) – 25 –...

  • Page 27: Operation Description

    9. OPERATION DESCRIPTION • Detection of inverter input current and current 9-1. Outline of Air Conditioner Control 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 to IGBT module (Compressor stop function) for motor and the outdoor fan motor.
  • Page 28 9-2. Operation Description 1. Basic operation ......................28 1. Operation control ....................28 2. Cooling/Heating operation ..................29 3. AUTO operation ..................... 29 4. DRY operation ......................29 2. Indoor fan motor control ..................... 30 3. Outdoor fan motor control ................... 32 4.

  • Page 29: Basic Operation

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

  • Page 30: Cooling/Heating Operation

    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 31: 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 Fan speed RAS-18SKV-E RAS-18SKVR-E RAS-22SKV-E RAS-22SKVR-E level COOL HEAT DRY Fan speed Air flow rate...
  • Page 32 Item Operation flow and applicable data, etc. Description 1) When setting the fan speed to L, 2. Indoor fan <In heating operation> L+, M, M+ or H on the remote motor control controller, the operation is per- formed with the constant speed HEAT ON shown in Fig.

  • Page 33: Outdoor Fan Motor Control

    Item Operation flow and applicable data, etc. Description The blowing air volume at the outdoor unit side is controlled. 1) The operation command sent 3. Outdoor fan from the remote controller is motor control Receiving the operation command from the controller of processed by the indoor unit indoor unit, the controller of outdoor unit controls fan speed.

  • Page 34: Capacity Control

    Item Operation flow and applicable data, etc. Description The cooling or heating capacity depending on the load is 1) The difference between set 4. Capacity adjusted. temperature on remote controller control (Ts) and room temperature (Ta) According to difference between the setup value of tempera- is calculated.

  • Page 35: Release Protective Control By Temperature Of Indoor Heat Exchanger

    Item Operation flow and applicable data, etc. Description 1) When temperature of the indoor 6. Release protective <In cooling/dry operation> heat exchanger drops below 5°C, control by tempera- (Prevent-freezing control for indoor heat exchanger) the compressor speed is ture of indoor heat In cooling/dry operation, the sensor of indoor heat reduced.

  • Page 36: Defrost Control (Only In Heating Operation)

    Item Operation flow and applicable data, etc. Description (This function removes frost adhered to the outdoor The necessity of defrost operation is 7. Defrost control heat exchanger.) detected by the outdoor heat exchanger (Only in heating temperature. The conditions to detect the operation) The temperature sensor of the outdoor heat ex- necessity of defrost operation differ in A,...

  • Page 37: Louver Control

    Item Operation flow and applicable data, etc. Description This function controls the air direction of the indoor unit. 8. Louver control 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 38: Eco Operation

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

  • Page 39: Temporary Operation

    Item Operation flow and applicable data, etc. Description Pressing [RESET] button starts the temporary opera- 1) When pressing [RESET] button, the 10. Temporary tion of [AUTO] operation. When keeping [RESET] temporary [AUTO] operation starts. operation button pressed for 10 seconds or more, the temporary 2) When keeping [RESET] button pressed [COOL] operation is performed.
  • Page 40 Item Operation flow and applicable data, etc. Description 11. Air purifying control [Detection of abnormality] 1. Purpose The air purifying control function is to alert the user to trouble in the ionizing or Air purifying operation air purifying operation. 2. Description PURE lamp ON Trouble is determined to have occurred (indicated by the FILTER indicator) in the...

  • Page 41: Pulse Modulating Valve (P.m.v.) Control

    Item Operation flow and applicable data, etc. Description This function controls throttle amount of the 1) When starting the operation, move the 12. Pulse refrigerant in the refrigerating cycle. valve once until it fits to the stopper. Modulating (Initialize) valve (P.M.V.) According to operating status of the air conditioner, control this function also controls the open degree of valve...

  • Page 42: Self-Cleaning Function

    Item Operation flow and applicable data, etc. Description 13. Self-Cleaning 1. Purpose function The Self-Cleaning operation is to minimize the growth of mold, bacteria etc. by running the fan and drying so as to keep the inside of the air conditioner clean. Unit now performing cooling or dry operation Self-Cleaning operation When the cooling or dry operation shuts...

  • Page 43: Remote-A Or B Selection

    Item Operation flow and applicable data, etc. Description • Self-Cleaning diagram 13. Self-Cleaning function Operation display FCU fan (450RPM) rpm is depend on presetting. OPEN (12.7º) FCU louver OPEN CLOSE ON or OFF ON or OFF Timer display depend on presetting of timer function. depend on presetting of timer function.

  • Page 44: Quiet Mode

    Item Operation flow and applicable data, etc. Description When the [QUIET] button is pressed, the fan of the 15. QUIET mode Quiet mode is the system which, control the indoor unit will be restricted the revolving speed at revolving speed of indoor fan to work −...

  • Page 45: One-Touch Comfort

    Item Operation flow and applicable data, etc. Description One touch comfort is the fully automated operation 18. One-Touch Operation condition for model to Europe that is set according to the preferable condition in Comfort market a region. When an indoor unit receives "One Touch Comfort Signal"...

  • Page 46: Auto Restart Function

    9-3. Auto Restart Function This indoor unit is equipped with an automatic restarting function which allows the unit to restart operating with the set operating conditions in the event of a power supply being accidentally shut down. The operation will resume without warning three minutes after power is restored. This function is not set to work when shipped from the factory.

  • Page 47: How To Cancel The Auto Restart Function

    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 48: Remote Controller And Its Fuctions

    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 49 4. DRY OPERATION (COOLING ONLY) For dehumidification, a moderate cooling performance is controlled automatically. 1. Press MODE : Select Dry 2. Press MODE : Set the desired temperature. 5. AIR PURIFYING OPERATION (RAS-18,22SKVR-E Only) During air conditioner operation Press PURE to start and air ionizer operation. The plasma air purifier and air ionizer can be activated or deactivated during air conditioner is stopped and the air ionizer starts in conjunction with plasma air purifier operation.
  • Page 50 Note: · Keep the remote control in accessible transmission to the indoor unit; otherwise, the time lag of up to 15 minutes will occur. · The setting will be saved for the next same operation. 10. PRESET OPERATION Set your preferred operation for future use. The setting will be memorized by the unit for future operation (except air flow direction).

  • Page 51: Name And Functions Of Indications On Remote Controller

    9-4-3. Name and Functions of Indications on Remote Controller [Display] All indications, except for the clock time indicator, are displayed by pressing the button. Transmission mark TIMER and 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 52: Installation Procedure

    10. INSTALLATION PROCEDURE 10-1. Installation Diagram of Indoor and Outdoor Units Pure Air Purifier SKVR only For the rear left and left piping Installation Hook plate Wall Insert the cushion between the indoor unit and wall, and tilt the indoor unit for better operation.
  • Page 53 10-2. Optional Parts, Accessories and Tools 10-2-1. Optional Installation Parts Part Code Parts name Q’ty Refrigerant piping Indoor unit name Liquid side (Outer diameter) Gas side (Outer diameter) 1 ea. RAS-18SKVR-E, 18SKV-E 6.35 mm 12.7 mm RAS-22SKVR-E, 22SKV-E Shield pipe (for extension drain hose) (polyethylene foam, 6 mm thick) Attachment bolt arrangement of outdoor unit 108 mm 125 mm...
  • Page 54 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 55: Indoor Unit

    10-3. Indoor Unit 10-3-2. Drilling a Hole and Mounting Instal- lation Plate 10-3-1. Installation Place • A place which provides enough spaces around the Drilling a hole indoor unit as shown in the diagram. When install the refrigerant pipes from the rear. •...
  • Page 56 10-3-3. Electrical Work When the installation plate is directly mounted on the wall 1. The supply voltage must be the same as the rated voltage of the air conditioner. 1. Securely fit the installation plate onto the wall by 2. Prepare a power source for the exclusive use of screws with the upper and lower catches, that the air conditioner.
  • Page 57 10-3-5. Piping and Drain Hose Installation CAUTION CAUTION • Be sure to refer to the wiring system diagram Piping and drain hose forming labeled inside the front panel. • Since condensation results in machine trouble, • Check local electrical regulations for any make sure to insulate both the connecting pipes specific wiring instructions or limitations.
  • Page 58 How to attach the drain cap In case of bottom right or bottom left piping 1. Insert hexagonal wrench (4 mm). • After making slits on the front panel with a knife or similar tool, cut them out with a pair of nippers or an equivalent tool.
  • Page 59 10-3-7. Drainage CAUTION 1. Run the drain hose at a downward sloped angle. • Bind the auxiliary pipes (two) and connecting cable with facing tape tightly. NOTE : In case of leftward piping and rear-leftward • Hole should be made at a slight downward slant piping, bind the auxiliary pipes (two) only with on the outdoor side.

  • Page 60: Outdoor Unit

    10-4. Outdoor Unit Precautions for adding refrigerant 10-4-1. Installation Place • Use a scale having a precision with at least 10 g per index line when adding the refrigerant. • A place which provides enough space around the outdoor unit as shown in the diagram. Do not use a bathroom scale or similar instrument.
  • Page 61 10-4-2. Draining the Water 10-4-3. Refrigerant Piping Connection • Holes are provided on the base plate of the Flaring outdoor unit to ensure that the defrost water produced during heating operations is drained off 1. Cut the pipe with a pipe cutter. efficiently.
  • Page 62 Revised-2 Tightening Connection Use a vacuum pump Align the centers of the connecting pipes and tighten Be sure to use a vacuum pump with counter-flow the flare nut as much as possible with your fingers. prevention function so that oil inside the pump does Then tighten the nut with a wrench and torque not flow back into the air conditioner pipes when the wrench as shown in the figure.
  • Page 63 Revised Packed Valve handling precautions • Open the valve stem all the way; but do not try to 1 2 3 open it beyond the stopper. • Securely tighten the valve stem cap with torque in the following table: Gas side (Ø12.7 mm) 50 to 62 N•m (5.0 to 6.2 kgf•m) Liquid side (Ø6.35 mm) 14 to 18 N•m (1.4 to 1.8 kgf•m)

  • Page 64: Test Operation

    10-5. Test Operation 10-5-4. Remote Controller A or B Selection Setting 10-5-1. Gas Leak Test When two indoor units are installed in the separated rooms, it • Check the flare nut connections for gas leaks with is not necessary to change the selector switches. a gas leak detector and/or soapy water.

  • Page 65: How To Diagnose The Trouble

    11. HOW TO DIAGNOSE THE TROUBLE The pulse motor circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according to the trouble diagnosis procedure as described below. (Refer to the check points in servicing written on the wiring diagrams attached to the indoor/outdoor units.) Table 11-1 Troubleshooting Procedure...
  • Page 66 CAUTION A high voltage (equivalent to the supply voltage) is also energized to ground through the sensors, PMV and other low-voltage circuits. The sensor leads and other wires are covered with insulated tubes for protection. Nevertheless, care must be taken to ensure that these wires are not pinched.
  • Page 67 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

    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 Press [CHECK] button with a tip of pencil to set the remote controller to the service mode. • “ ” is indicated on the display of the remote controller. TOSHIBA Press [ON ] or [OFF ] button If there is no fault with a code, the indoor unit will beep...
  • Page 70 11-4-2. Caution at Servicing 1. After servicing, press 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 71 Block distinction Operation of diagnosis function Judgment and action Check Check Block Cause of operation conditioner Remarks code code status Outdoor P.C. Inverter over-current All off Displayed when Even if trying operation again, all board protective circuit error is detected. operations stop immediately.

  • Page 72: Judgment Of Trouble By Every Symptom

    11-5. Judgment of Trouble by Every Symptom 11-5-1. Indoor Unit (Including Remote Controller) (1) Power is not turned on (Does not operate entirely) <Primary check> 1. Is the supply voltage normal? 2. Is the normal voltage provided to the outdoor unit? 3.
  • Page 73 (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.) ( RAS-18, 22 Series ) Turn off power...
  • Page 74 (4) Indoor fan motor automatically starts to rotate by turning on power supply (For DC fan motor in RAS-18,22SKV-E, RAS-18,22SKVR-E) <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.
  • Page 75 (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 START/STOP button. Operation lamp on indoor unit is not indicated.
  • Page 76 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 77 11-6. Check Code 18 and 1E <Check procedure> Gas leakage, Discharge temp. error, disconnection of TS/TE gas leakage sensors (Check code 02, 1C) (Check code 03, 1E) Valve drive check Is coil of the pulse motor valve Set it correctly. (P.M.V.) correctly set? Set it correctly.

  • Page 78: Troubleshooting

    11-7. Troubleshooting 11-7-1. How to Check Whether the Air Purifier is Good or Not (18, 22SKVR-E only) Turn off the power breaker once, and turn on again after 10 seconds. To item “Power supply is not turned on” Does the OPERATION indicator flash? Turn off the power breaker and remove CN41 (Micro switch connector).
  • Page 79 11-7-2. How to Check Whether the Minus Ion Generator is Good or Not (18, 22SKVR-E only) Turn off the power breaker once, and turn on again after 10 seconds. To item “Power supply is not turned on” Does the OPERATION indicator flash? Turn off the power breaker and remove CN41 (Micro switch connector).

  • Page 80: How To Diagnose Trouble In Outdoor Unit

    11-8. How to Diagnose Trouble in Outdoor Unit 11-8-1. Summarized Inner Diagnosis of Inverter Assembly Table 11-8-1 Diagnosis/Process flowchart Item Contents Summary Turn “OFF” the power supply Preparation breaker, and remove 3P Remove connector connector which connects of compressor. inverter and compressor. If fuse was blown, be sure to •...

  • Page 81: How To Check Simply The Main Parts

    Diagnosis/Process flowchart Item Contents Summary Check Check winding resistance between phases of compres- sor, and resistance between outdoor frames by using a tester. • Is not grounded. → OK if 10MΩ or more Replace control board assembly. ⎫ → OK if 0.51Ω → 0.57Ω •...
  • Page 82 (3) Check procedures RAS-18, 22 Series Table 11-9-1 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 83 11-9-2. P.C. Board Layout (RAS-18, 22 Series) +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 11-9-3. 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 controller...
  • Page 85 11-9-5. 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: How To Simply Judge Whether Outdoor Fan Motor Is Good Or Bad

    11-10. 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 controller check code “02 : Outdoor block, 1A : Outdoor fan drive system error”...

  • Page 87: How To Replace The Main Parts

    12. HOW TO REPLACE THE MAIN PARTS WARNING • Since high voltages pass through the electrical parts, turn off the power without fail before proceeding with the repairs. Electric shocks may occur if the power plug is not disconnected. • After the repairs have been completed (after the front panel and cabinet have been installed), perform a test run, and check for smoking, unusual sounds and other abnormalities.
  • Page 88 Part name Procedures Remarks  Front panel 4) Press "PUSH" part under the front panel and remove hooks of the front panel from Installation plate the 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 Part name Procedures Remarks  ‚ High voltage 1) Follow to the procedure in the item generator 2) To remove the air ionizer from the back body, (only in model pull it toward you. RAS-18, 22 SKVR-E) 3) Disconnect the connectors of the high voltage Connector 2 Screws generator.
  • Page 90 Part name Procedures Remarks ‚ ƒ Electric parts 1) Follow the procedure up to 3) 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 91 Part name Procedures Remarks „ 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.) ƒ … Evaporator 1) Follow to the procedure in the item (Heat exchanger) 2) Remove the pipe holder from the rear side of the main unit.
  • Page 92 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> • If the bearing is out from the housing, push it into the specified position and then incorporate it in the main body.
  • Page 93 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 94 Part name Procedures Remarks ˆ 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 95 12-2. Microcomputer Part name Procedure Remarks  Common procedure 1) Turn the power supply off to stop the Replace terminal block, operation of air-conditioner. microcomputer ass’y and the P .C. board ass’y. 2) Remove the front panel. • Remove the 2 fixing screws. 3) Remove the electrical part base.
  • Page 96 12-3. Outdoor Unit Part name Procedure Remarks  Common 1. Detachment procedure NOTE Wear gloves for this job. Otherwise, you may injure your hands on the parts, etc. 1) Stop operation of the air conditioner, and turn off the main switch of the breaker for air conditioner.
  • Page 97 Part name Procedure Remarks ‚ Front cabinet 1. Detachment  1) Perform step 1 in 2) Remove the fixing screws (ST1TØ4 × 8L 2 pcs.) used to secure the front cabinet and inverter cover, the screws (ST1TØ4 × 8L 3 pcs.) used to secure the front cabinet at the bottom, and the fixing screws (ST1TØ4 ×...
  • Page 98 Part name Procedure Remarks ƒ  Inverter 1) Perform work of item 1 in Inverter cover assembly 2) Remove screw (ST1TØ4 × 8L 2 pcs.) of the P . C. board upper part of the front cabinet. (Soldered surface) • If removing the inverter cover in this condition, P .C.
  • Page 99 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 CN600 CN701 •...
  • Page 100 Part name Procedure Remarks … Side 1. Side cabinet (right) cabinet ‚ 1) Perform step 1 in and all the steps in ƒ 2) Remove the fixing screw (ST1TØ4 × 8L 5 pcs.) used for securing the side cabinet to the bottom plate and valve fixing panel.
  • Page 101 Part name Procedure Remarks ‡  ‚ ƒ „ … Compressor 1) Perform work of item 1 of 2) Extract refrigerant gas. 3) Remove the partition board. (ST1TØ4 × 8L 3 pcs.) 4) Remove the sound-insulation material. 5) Remove terminal cover of the compressor, and disconnect lead wire of the compressor from the terminal.
  • Page 102 Part name Procedure Remarks ‰ Electronic 1. Detachment expansion ‚ ƒ 1) Perform step 1 in , all the steps in and 1 valve coil … Coil 2) Remove the coil by pulling it up from the anti-turn electronic control valve body. lock 2.
  • Page 103 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 for RAS-22SAV-E Detail C for RAS-18SAV-E TS sensor (Suction pipe temperature sensor)

  • Page 104: Exploded Views And Parts List

    43T70313 HOSE, DRAIN 43T44030 EVAPORATOR ASSY (18SKV-E,SKVR-E) 43T20016 FAN, ASSY, CROSS FLOW 43T44031 EVAPORATOR ASSY (22SKV-E,SKVR-E) 43T49010 PIPE, SHIELD 43T09041 GRILLE ASSY, SUB TOSHIBA (18,22SKV-E) 43T83003 HOLDER, REMOTE CONTROL 43T82008 PLATE, INSTALLATION 43T09042 GRILLE ASSY, SUB TOSHIBA 43T69499 UNIT, ELECTRIC PURIFIER...
  • Page 105 Indoor Unit (Part-E) Location Part Location Part Description Description 43T50308 SENSOR (TC) 43T69721 PC-BOARD ASSY (18SKV-E) 43T60331 TERMINAL BLOCK, 3P 43T69722 PC BOARD ASSY (22SKV-E) 43T69320 SENSOR (TA) 43T69723 PC BOARD ASSY (18SKVR-E) 43T62003 CLAMP, CORD 43T69724 PC BOARD ASSY (22SKVR-E) 43T69725 PC BOARD ASSY, WRS-LED 43T51308 SWITCH ASSY, MICRO (18,22SKVR-E) (18,24SKV-E)
  • Page 106 13-2. Outdoor Unit – 105 –...
  • Page 107 4301V080 PLATE, FIX, VALVE, PACKED 37546845 VALVE, PACKED, 6.35 43032441 NIPPLE, DRAIN 43146680 VALVE, PACKED, 12.7 43089160 CAP, WATERPROOF 43147196 BONNET, 1/4 IN 4301P703 MARK, TOSHIBA 43147195 BONNET, 1/2 IN 4301P729 MARK, INVERTER 43047676 NUT, FLARE, 6.35 43042485 RUBBER, CUSHION 43047655 NUT, FLARE, 12.7 43063321 HOLDER, SENSOR (TD) 43047679 CAP, VALVE, PACKED, 6.35...
  • Page 108 13-3. P.C. Board Layout (Outdoor) Location Part Location Part Description Description 43050422 SERSOR, TE 43160566 TERMINAL BLOCK, 6P, 20A 43050423 SENSOR, TS 4306V029 PC BOARD ASSY, MCC5009 (18SAV-E) 43050427 SENSOR, TO 4306V030 PC BOARD ASSY, MCC5009 (22SAV-E) 43050430 SENSOR, TD 43160571 FUSE, HOLDER, 15A, 250V 43062228 BASE, PC BOARD 43160590 FUSE...
  • Page 109 T O S H I B A C A R R I E R C O R P O R AT I O N 2 CHOME 12-32, KONAN, MINATOKU, TOKYO, 108-0075, JAPAN Copyright 1999 to 2007 TOSHIBA CARRIER CORPORATION, ALL Rights Reserved.

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