Toshiba RAS-M18SA-E Service Manual Download Page 51

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Procedure

1) Turn the power supply off to stop the operation of air-

conditioner, and disconnect the power cord from the
AC supply.

2) Remove the front panel.

• Remove the two fixing screws. (

4 x 14 )

3) Remove the electrical part base.

1) Perform the process

above.

2) Remove terminal cover (Up), (Down).

3) Disconnect the terminal blocks connected with the

connecting cable, and the power cord from base E-
parts by removing the screws.

4) Remove the thermal fuse (77°C) from base E-parts.

10-2. Microcomputer (RAS-10SK-E, RAS-10SKX)

No.

Part name

Common
procedure

Thermal fuse
replacement

Remarks

Replace the thermal fuse, terminal
block, power cord, microcomputer
ass’y and the power supply PC
board ass’y.

Summary of Contents for RAS-M18SA-E

Page 1: ... U L T I S P L I T W A L L T Y P E T O S H I B A P R I N T E D I N J A P A N F e b 1 9 9 7 T o M o F I L E N O A 0 0 9 7 0 4 A I R C O N D I T I O N E R R A S 1 0 S K E x 2 R A S M 1 8 S A E R A S 1 0 S K X x 2 R A S M 1 8 S A X ...

Page 2: ... 7 1 How to Set the Auto Restart 16 7 7 2 How to Cancel the Auto Restart 17 7 7 3 In Case of Power Failure during the Timer Operation 17 8 INSTALLATION PROCEDURE 18 8 1 Safety Cautions 18 8 2 Installation Diagram of Indoor and Outdoor Units 20 8 3 Installation 21 8 3 1 Optional Parts 21 8 3 2 Installation Parts 21 8 4 Indoor Unit 22 8 4 1 Cutting a Hole and Mounting Installation Plate 22 8 4 2 Ele...

Page 3: ...door PC Board 40 9 3 3 Outdoor Unit does not Operate 40 9 3 4 Only Compressor does not Operate 41 9 3 5 Only Outdoor Fan does not Operate 42 9 3 6 Only the Indoor Fan does not Operate 43 9 4 How to Check the Remote Control Including the Indoor PC Board 44 9 4 1 How to Check the PC Board 45 9 4 2 PC Board Layout 47 9 4 3 How to Reduce the Operation Time of the Anti Restart Timer 48 10 PART REPLACEM...

Page 4: ...Indoor unit Outdoor unit Outer diameter Height Width Depth High fan Medium fan Low fan Height Width Depth 220 230 240V Model Output Model kW Phase V Hz kW Indoor Outdoor A lit h dB dB kg mm mm m 2 m mm mm mm mm kg m3 h m3 h m3 h W mm mm mm kg m3 h W W C RAS 10SK E 2 units RAS M18SA E RAS 10SKX 2 units RAS M18SAX COOLING 1 Indoor unit 2 Indoor units A or B A B 220V 230V 240V 220V 230V 240V 2 6 2 6 ...

Page 5: ...gth of the connection piping is up to 10m There is need to add the refrigerant 10g m as long as the each length of the connection piping is up from 11m to 15m Note 1 Capacity is based on the following temperature conditions Temperature Indoor unit inlet air temperature Outdoor unit inlet air temperature Condition DB WB DB WB JIS C9612 1994 Cooling 27 C 19 C 35 C 24 C ...

Page 6: ...ose 0 54m Connecting pipe 0 39m Flare ø6 35 Flare ø9 52 Hanger 659 65 5 326 450 65 5 For stud bolt ø8 ø10 For stud bolt ø6 Hanger Minimum distance to wall Minimum distance to ceiling 265 Knock out system Front panel Back body 20 20 37 40 5 60 5 790 126 269 319 76 Center line Installation plate outline Hanger Hanger 40 5 3 5 Hanger Minimum distance to wall 17 20 46 120 or more 120 or more 66 or mor...

Page 7: ... Air inlet Air inlet Air outlet ø11x14 hole ø6 hole R10 600 Detail Drawing 50 36 300 90 600 90 50 830 60 344 A 6 ø11x14 hole for ø8 ø10 anchor bolt 8 ø6 hole for fixing outdoor unit Liquid side Flare ø6 35 Gas side Flare ø12 7 A Handle ø420 Fan guard Electric Parts cover Service port FOR UNIT B FOR UNIT A 2 2 Outdoor Unit RAS M18SA E RAS M18SAX ...

Page 8: ...5 3 1 DC MOTOR SG01 DSA BLU BLU BLU BLU BLU PNK BLK WHI R116 RAS 10SK E 220 230 240V 50Hz RAS 10SKX 220 230 240V 50Hz L N L N Model Section A Section A 1 2 1 2 1 2 BLU YEL BLK RED WHI OUTDOOR TERMINAL BLOCK POWER SUPPLY 50Hz 220 230 240V TERMINAL BLOCK POWER TERMINAL BLOCK SPARK KILLER RUNNING CAPACITOR MAGNETIC RELAY DSA Surge absorber 1 2 N L WHI WHI WHI RED RED WHI WHI PNK BLK BLK BLK BLK BLK B...

Page 9: ...ilter L01 Diode DB01 Capacitor C02 Fuse F01 Power supply IC IC01 Varistor R21 R109 Resistor R01 Louver motor Type ICF 35 19 3 or TICF 35 19 3 microprocessor SWT 34 TMP87CK40F DI1U microprocessor RF 103YOR6 RBV 406 CEAUF2W101M20 MT3 MA2830 FJ 15G561K ERF 5TK5R6 MP35EA7 Specifications DC 35V 19W 10kΩ at 25 C DC390V Secondary DC35V 12V 7V Coil DC12V 75mA Rated AC250V 20A 10kΩ at 25 C 10mH AC 0 6A 4A ...

Page 10: ...1 Evaporator INDOOR UNIT B Cross flow fan T1 P P Propeller fan Capillary tube ø1 5x1100 Strainer Strainer Capillary tube ø1 5x1100 Compressor B PH102T1 4C Compressor A PH102T1 4C OUTDOOR UNIT Mark means check points of Gas Leak Refrigerant R 22 1 3kg 0 65kgx2 Note Measure the heat exchanger temperature at the center of U bend By means of TC sensor Fig 5 1 Table 5 1 50Hz Standard Cooling High tempe...

Page 11: ...ys Initializing Circuit C P U Main Unit Control Panel AC 220 230 240V 50Hz Remote Control Operation Display Timer Display ECONO Sign Display FAN ONLY Sign Display Indoor Fan Motor Compressor Outdoor Fan ON OFF Signal Louver Motor RY02 RY01 Thermo Sensor Louver Control 3 minute Delay at Restart for Compressor Motor Revolution Control Processing Temperature Processing Timer Magnetic Relay AC 220 230...

Page 12: ...e START STOP button Fig 7 1 1 Auto setting of air volume Table 7 1 1 Manual setting of FAN SPEED 2 Once the setting is made the operation mode is memorized in the microcomputer so that the same operation can be effected thereafter simply by pushing the START STOP button Fig 7 2 1 2 Relays RY01 and RY02 are turned on to energize the outdoor unit and a cool operation is carried out 1 When the FAN is...

Page 13: ...controlled as shown in Fig 7 3 1 Fig 7 3 2 Fig 7 3 1 The microprocessor turns the compressor on and off at regular intervals 4 to 6 minutes on and or off During the compressor off the in door fan will operate in the super low position The indoor fan will operate in the AUTO posi tion 2 The pattern of operation depending on the rela tion between room temperature and set tempera ture is shown below ...

Page 14: ...ed 7 4 1 Temporary Auto When theTEMPORARY button is pushed the set tem perature is fixed at 24 C and controlled in accordance with the chart shown in Fig 7 4 1 Fig 7 4 1 Cooling mode Cooling mode Dry mode 4 1 The same cooling mode as the room temperature control is set at set temp 1 C The Louver moved downward The same cooling mode as the room temperature control is set at set temp 1 C The same dr...

Page 15: ... is changed automatically as shown in Fig 7 5 1 2 Fan speed LOW 2 1 Set temp 1H 2H TIME 0H C ECONO button is pushed Set temp is changed Set temp is changed 7 6 Low Temperature Limit Control Cooling Operation The microprocessor detects the indoor heat exchanger temperature so as to prevent freezing up the indoor heat exchanger Control is performed as shown in Fig 7 6 1 Fig 7 5 1 Compressor Less tha...

Page 16: ...ttings can be carried out During subsequent operation the orange light is lit The Auto Restart function will not accept an instruc tion if timer operation with the remote control is selected Please refer to the section on setting the timer or setting the louver When the system is stand by not running During louver swing AUTO operation after restart by the Auto Restart function the louver swing sto...

Page 17: ...thout set ting of Auto Restart operation the reservation is cancelled with power failure The OPERATION lamp on the main unit goes on and off to inform of power failure In that case try to reserve OFF TIMER operation When Auto Restart operation is set OFF TIMER reservation is also cancelled with power failure OPERATION Press the TEMPORARY button continuously more than three seconds MOTION Stand by ...

Page 18: ...USTIBLE GAS OF GAS VAPORS FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD PLACE THE UNIT WELL AWAY MORETHAN 2M FROM HEAT SOURCES SUCH AS RADIATORS HEAT RESISTORS FUR NACE STOVES ETC WHEN MOVING THE AIR CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE AGAIN BE VERY CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT R 22 WIT...

Page 19: ...s Please read the installation manual carefully before installing the unit It contains further important instruc tions for proper installation UK Plugs and Sockets etc Safety Regulations 1994 SI Number 1768 With regard to Schedule 3 Item 7 of the above UK Regulations this appliance must be permanently con nected to the fixed wiring of the main electrical supply by means other than the use of an ap...

Page 20: ...tom Rear Right Rear left Left Cut the piping hole sloped slightly Wall 120 mm or more For the rear and left piping Insert the remote control holder cushion between the indoor unit and wall and lift indoor unit to make work easier Do not allow the drain hose to get slack Make sure to run the drain hose sloped downward The auxiliary piping can be connected the left rear left rear right or bottom Ins...

Page 21: ...s likely to be exposed to a strong wind Use ø8 or ø10 anchor bolts 600mm Air inlet 325mm Air outlet Part code A B C Parts name Refrigerant piping Liquid side ø6 35 mm Gas side ø9 52 mm Pipe insulating material polyethylene foam 6 mm thick Putty PVC tapes Q ty Each one 1 Each one Part No Name of parts Q ty Installation plate x 1 Wireless remote control x 1 Clip anchor x 6 Remote control holder x 1 ...

Page 22: ...is is necessary to prevent image disturbances or noise interference The location of the remote control should be deter mined as shown below 8 4 1 Cutting a Hole and Mounting Installation Plate Cutting a hole When installing the refrigerant pipes from the rear Fig 8 4 1 Fig 8 4 3 Top view Indoor unit 5 m 5m 45 45 Remote control Reception range Axial distance Remote control Reception range 7m Side v...

Page 23: ...ing 4 to 6 pieces of mounting screw securing four corners with screws Installation plate Keep horizontal direction Anchor bolt Projection 15mm or less 5mm dia hole 3 Clip anchor 8 Mounting screw ø4 x 25 No adjustment is necessary CAUTION Use power specified in above table This appliance can be connected to the mains in either of the following two ways 1 Connecting the power cord to the main power ...

Page 24: ...ut the rear panel following the cutting mark and put the power supply cord through the notch Be sure to smooth out the notch with a file etc 8 4 3 Wiring Connection WARNING To plug the cable in the plug receptacle take the fol lowing precaution THIS APPLIANCE MUST BE EARTHED IMPORTANT THE WIRES IN THIS MAINS LEAD ARE COLORED IN ACCORDANCE WITH THE FOLLOWING CODE Fig 8 4 5 As the colors of the flex...

Page 25: ...c wiring instructions or limitation Stripping length of connecting cable Fig 8 4 11 3 1 2 4 Push Push Push Push Connecting cable about 15cm Terminal block Cord clamp Screw Screw Connecting cable Terminal cover Screw 2 1 The connecting cable doesn t need the earth line Fig 8 4 9 For two conductor cable system NOTE Use stranded wire only Wire type More than H05 RN F Fig 8 4 10 How to install the fro...

Page 26: ...two and connecting cable with facing tape tightly In case of left ward piping and rear leftward piping bind the auxiliary pipes two only with facing tape Carefully arrange pipes so that any pipe does not stick out of the rear plate of the indoor unit Carefully connect the auxiliary pipes and con necting pipes to each other and cut off the in sulating tape wound on the connecting pipe to avoid doub...

Page 27: ...ing its bottom up by the specified parts Space for pipes Wall Drain guide Fig 8 4 18 CAUTION Arrange the drain pipe for proper drainage from the unit Improper drainage can result in damage to prop erty This air conditioner has the structure designed to drain water collected from dew which forms on the back of the indoor unit to the drain pan Therefore do not store the power cord and other parts at...

Page 28: ... and discharged air do not disturb your neighbors A place which is not exposed to a strong wind A place free of a leakage of combustible gases A place which does not block a passage When the outdoor unit is to be installed in an el evated position be sure to secure its feet An allowable length of the connecting pipe is up to 15 m An allowable head level is up to 5 m A place where the drain water d...

Page 29: ...p to each of the packed valve stems Fig 8 5 5 Fig 8 5 2 2 Insert a flare nut into the pipe and flare the pipe Outer diam 6 35 mm 9 52 mm Imperial 1 3 mm 1 6 mm Rigid 0 7 mm 1 0 mm A mm Fig 8 5 4 Half union or packed valve Flare nut Externally threaded side Internally threaded side Use a wrench to secure Use a torque wrench to tighten 90 Obliquity Roughness Warp VP Outdoor unit Charge hose B Servic...

Page 30: ...ow a generous wir ing capaciry 1 The supply voltage must be the same as the rated voltage of the air conditioner 2 Prepare the power source for each unit Indoor unit A Outdoor unit Indoor unit B Fuse or breaker Power cord Power cord Power cord Connecting cable Service cap connection Electric parts cover Refrigerant piping unit B Refrigerant piping unit A Fig 8 5 6 CAUTION Never carry out an air pu...

Page 31: ...Strip the sheath of power cord and connect ing cable with following stripping length to and insert into the terminal block 3 When connect the power cord the connecting cable to the outdoor unit terminal make a loop as shown in the installation diagram of outdoor unit page 20 to prevent water coming in the outdoor unit 4 Insulate the unused cords conductors with water coming in the outdoor unit Pro...

Page 32: ...selected To cancel the Auto Restart follow the steps de scribed in the section Auto Restart Function of the Owner s Manual 8 6 Others 8 6 1 Gas Leak Test Fig 8 6 1 Check the flare nut connections valve stem cap connections and service cap connections for gas leak with a leak detector or soap water 8 6 2 Test Operation To switch the TEST RUN COOL mode press TEM PORARY button for 10 sec The beeper w...

Page 33: ...Power Supply Voltage The line voltage must be AC 220 230 240V If the line voltage is not within this range this air conditioner may not work normally 9 1 2 Incorrect Cable Connection between Indoor and Outdoor Units The indoor unit is connected to the outdoor unit with 2 cables Make certain that the indoor and outdoor units have been connected properly with terminals assigned the same numbers wire...

Page 34: ...the power is turned on the opera tion starts automatically Description The OPERATION lamp flashes indicating that power is turned on If this happens push the START STOP button once to cause the lamp to stop flashing A power outage also causes the lamp to flash Fan speed is automatically controlled in the dry mode The compressor will not stop while the compressor on hold timer 3 minutes timer is ac...

Page 35: ...tents of the self diagnosis as block displays on the display panel of the indoor unit Table 9 2 1 1 Judgement from defective operation or abnormal operation Table 9 2 2 A B C D E F Block display OPERATION display flashing 1 Hz OPERATION display flashing 5 Hz OPERATION display flashing 5 Hz OPERATION display flashing 5 Hz OPERATION display flashing 5 Hz OPERATION TIMER and FAN ONLY display flashing...

Page 36: ...erature is displayed on the display and other display is turned off 2 Selecting ordinary mode Push the all clear button ACL on the rear bot tom of the wireless remote control with a tip of pencil for more than 3 seconds Make sure the operation mode display wind volume dis play clock display and setting temperature dis play are turned on and of the clock display is flashing Cautions when doing serv...

Page 37: ...At the same time also make sure the op eration lamp is also flashing This shows that the protection circuit on the indoor PC board is working d Operate theTEMP key and make sure the remote control display shows and flashing of the operation lamp If the opera tion lamp is flashing it shows the protection circuits for connecting cable is working or thermal fuse is blown e In the same way operate the...

Page 38: ...ition Indicated when detected abnormal Indicated when detected abnormal Indicated when detected abnormal Indicated when detected abnormal Indicated when detected abnormal Judgment and action 1 Check thermo sensor 2 If it is OK check PC board 1 Check heat exchanger sensor 2 If it is OK check PC board 1 Disconnect the power plug from AC outlet and pull out the connector CN10 for the motor then conne...

Page 39: ...rong wiring of AC cord or connecting cable is defective Replace the thermal fuse set Check connection Is the indication voltage DC12V or 5V of main PC board correct Is the voltage across C02 measured DC310V 340V Refer to the paragraph Pre check or defective circuit before power PC board block Shut off the power supply once and turn it on again after dis connecting the motor connector CN10 Is the s...

Page 40: ...Is it wired as shown in Figure below YES NO Shut off the power supply from AC outlet once and turn it on after 5 seconds Does the OPERATION lamp flash Does the power turn on by pushing the START STOP button of the remote control Is cable connection between indoor and outdoor units correct Check items as following procedure in 9 3 4 9 3 5 9 3 6 Replace the PC board See Power can not be turned on Re...

Page 41: ...overload relay normal Does the compressor start Compressor starts but it stops after a while Cables between indoor and outdoor units are defective Re wire or replace the defective cords Compressor is defective Capacitor is defective Overload relay is defective Compressor is defective Correct cabling between indoor and outdoor units NO NO NO NO NO NO YES YES YES YES YES YES See Power can not be tur...

Page 42: ... outdoor units are defective Outdoor fan motor is defective Correct cabling between indoor and outdoor units NO NO NO NO YES YES YES YES Are all the cords for outdoor fan motor normal Correct the wire or replace the defective cords Capacitor for outdoor fan motor is defective See Power can not be turned on Relays RY01 RY02 or IC31 or IC30 is failure Is the voltage across the indoor terminal 1 2 22...

Page 43: ...ss flow fan rotate normally Repair the bearing of the drain fan Turn on the power supply Is the rotation signal DC 5V 0V output between 4 blue lead wire and 2 black lead wire of the motor connector CN10 when rotating the cross flow fan by hand in no operating status 2 pulses one turn Replace the control PC board Shut off the power supply and turn it on after disconnecting the motor connector CN10 ...

Page 44: ...luorescent light Is operation possible when the transmitter is moved nearer to the infrared signal receiver of the air conditioner Battery life Can any signal tone be heard in a transistor radio when transmitting within 5cm distance from the radio Does the transmission indicator light Is there any beep and operation Short circuit the metal terminal at the side of the battery compartment all clear ...

Page 45: ... PC board hold the whole housing Do not pull at the lead wire 2 Inspection procedures 1 When a PC board is judged to be defective check for disconnection burning or discolora tion of the copper foil pattern or this PC board 2 The PC board consists of the following 2 parts a Main PC board part Power relay indoor fan motor drive circuit and control circuit C P U and peripheral cir cuits buzzer drive...

Page 46: ...e time of the restart delay timer is shortened 2 Cool operation 3 Air volume AUTO 4 Make the setting temperature lower enough than room temperature 5 Continuous operation The status of No 5 is continued and make the following condition 1 Heat operation 2 Make the setting temperature higher enough than room tem perature Turn the power on after connecting the motor connector Start the operation with...

Page 47: ... 47 9 4 2 PC Board Layout Bottom View Top View ...

Page 48: ...hrough holes on the rear of the wire less remote control unit Push the START STOP button to start operation with the diode attached Fig 9 4 1 Timer short diode Wireless remote control Table 9 4 2 Approximate value of the sensor thermistor resistance TA TC kΩ Temperature Sensor Themo Sensor 0 C 10 C 20 C 25 C 30 C 35 8 20 7 12 6 10 0 7 92 ...

Page 49: ... cooling or drying operation is performed without pressing the center of the air outlet the surface of the front panel may be covered with frost and have a waterdrop 1 Perform the process above 2 Remove the screw securing the shield metal plate 3 Remove the electrical part cover by pressing the nail located on upper portion of the electrical part cover 4 Remove the drain guide 5 Remove the screw s...

Page 50: ...tly to the right side 1 Perform the process 2 Loosen the set screw of the cross flow fan 3 Remove the screw fixing the shaft bearing base 4 Lift slightly up the left side of the heat exchanger and pull the shaft bearing base out left downwards When assembling it fix it with the set screw on the position where the gap between the rear plate surface and the left end surface of the cross flow fan is ...

Page 51: ... the process above 2 Remove terminal cover Up Down 3 Disconnect the terminal blocks connected with the connecting cable and the power cord from base E parts by removing the screws 4 Remove the thermal fuse 77 C from base E parts 10 2 Microcomputer RAS 10SK E RAS 10SKX No Part name Common procedure Thermal fuse replacement Remarks Replace the thermal fuse terminal block power cord microcomputer ass...

Page 52: ...outdoor unit and indoor unit 2 Remove the electric parts cover 4 screws 3 Remove the cord clamps 6 screws 4 Remove the connecting cables and the power cord after loosening 7 screws of terminal block 5 Remove the front cabinet 8 screws Pull the front lower portion toward you and remove it pulling out upward 1 Remove the back cabinet and the side cabinet 12 screws 1 Remove the capacitor band each 1 ...

Page 53: ... name Over load relay Procedure 1 Perform the process above 2 Remove terminal cover of compressor 3 Remove OL holder and pull over load relay up 4 Disconnect the lead wire from the over load relay terminal Remarks ...

Page 54: ... the switch SW03 provided on the PC board as follows 2 Don t wind the black lead wire around the current trans CT T02 ON OFF 1 2 3 4 5 6 1 2 3 4 5 6 ON ON OFF RY01 C02 RY02 Brown N L Power terminal block T02 PC board Blue White Black 1 2 Indoor terminal block ...

Page 55: ...Part Description No No 401 43T60002 Base Terminal 3P AC 300V 20A 402 43T69004 Sensor Heat Exchanger 10kΩ 25 C 403 43T69005 Sensor Thermostat 10kΩ 25 C 404 43T60004 Fuse Temperature 77 C 405 43T69007 PC Board WRS LED MCC 635 406 43T69008 PC Board MCC 713 407 43T61001 Base E Parts ABS Black UL94 5V 408 43T62006 Base Shield SGCC Z08 LUB ...

Page 56: ...03 Motor Stepping 214 43T07001 Bushing 215 43T44003 Refrigerantion Cycle Assembly 216 43T47006 Pipe Delivery 217 43T47005 Pipe Suction 218 43T49007 Pipe Shield 219 43T19003 Holder Sensor 221 43T49005 Plate of EVA SEAL 222 43T49006 Holder for Plate of EVA SEAL 223 43T49004 Rubber of Sound Insulation 224 43T79002 Drain Guide 225 43T39002 Motor Band Left 226 43T39001 Motor Band Right 227 43T21005 Fan...

Page 57: ...63289 Lead Wire Clamp 14 43T96001 Bushing 15 43T43006 Condenser 16 43T43007 Sub Condenser 17 43T46002 Packed Valve 6 35 18 43T47003 Bonnet 6 35 dia 19 43T46001 Packed Valve 9 52 20 43T47002 Bonnet 9 52 dia 21 43T47008 Capillary Tube 1 5 dia 22 43T41402 Compressor PH102T1 4C 23 43T63001 Holder OL Relay 24 43T49001 Rubber Cushion 25 43054408 Relay Overload J MRA99285 9201 26 43055483 Capacitor Plast...

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