Toshiba RAS-18YAH-A Service Manual Download Page 34 | Manualshive

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Indoor Printed Circuit Board (P.C.B.)

MMC-1293

B

5V-power source transistor (emitter pin)

Switch board

A

12V-power source transistor (emitter pin)

D

Reset input (Pin 7)

C

Watchdog timer output

(CPU Pin 28)

Power source (R.S.SER)

Transformer
primary side

Temp. fuse

Transformer
secondary side

Light-receiving unit

Buzzer board

Louver

Fan revolution
pulse input

F

TC sensor input

E

TA sensor input

J

Serial input LED (Orange) from outdoor

K

Serial output LED (Green) to outdoor

MMC-1275

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Summary of Contents for RAS-18YAH-A

Page 1: ...SERVICE MANUAL FILE NO A00 0001 AIR CONDITIONER SUPPLEMENT SPLIT WALL TYPE PRINTED IN THAILAND Apr 2000 RAS 18YKH E RAS 18YAH E RAS 18YKH A RAS 18YAH A ...

Page 2: ...ION VIEWS 5 3 WIRING DIAGRAM 7 4 SPECIFICATIONS OF ELECTRICAL PARTS 8 5 REFRIGERANT CYCLE DIAGRAM 9 6 CONTROL BLOCK DIAGRAM 10 7 OPERATION DESCRIPTION 12 8 INSTALLATION PROCEDURE 16 9 TROUBLESHOOTING CHART 20 10 EXPLODED VIEWS AND PARTS LIST 37 ...

Page 3: ...pth mm Net weight kg Condenser type Outdoor fan type Airflow volume m h Fan motor output W Compressor Model Output W Safety device Auto louver Usable outdoor temperature range C 1 SPECIFICATIONS Specifications are subject to change without notice RAS 18YKH E RAS 18YAH E RAS 18YKH A RAS 18YAH A Cooling Heating Cooling Heating 220 240V 240V 5 0 6 35 6 50 5 0 6 50 Single 220 240V 240V 50 2 03 2 20 2 ...

Page 4: ... inlet air temperature DB WB JIS C9612 1994 Cooling Heating 27 C 20 C 19 C 35 C 7 C 24 C 6 C Notes 2 CHARGELESS No additional refrigerant required This air conditioner accepts a connection piping length of up to 15m and a head of up to 6m There is no need to add the refrigerant as long as the total length of the connection piping is up to 15m ...

Page 5: ...r Power cord 1 7m Air outlet Hanger Front panel Rear plate Hanger Auxiliary pipe 0 49m Flare Ø6 35 Auxiliary pipe 0 39m Flare Ø12 7 Drain hose 0 60m Anchor bolt hole Ø8 Ø10 Anchor bolt hole Ø6 Detail of installing dimensions of the indoor unit Minimum distance from wall Minimum distance from wall Minimum distance from ceiling Hanger Ø65 Piping hole Installation plate Center line Ø65 Piping hole Wi...

Page 6: ...600 or more 600 or more Mounting dimension of anchor bolt 600 Air inlet Air inlet Air outlet 4 x Ø12 x 18 for Ø8 Ø10 anchor bolt Handle Handle 690 340 63 8 880 310 340 pitch 364 12 23 Electric Parts cover Liquid side Flare Ø6 35 Gas side Flare Ø15 88 Service port 120 A 140 600 4 Ø12 x 18 hole for Ø8 Ø10 anchor bolt Ø25 Drain outlet ...

Page 7: ... 3 1 3 1 1 2 3 1 3 1 3 3 2 1 1 Switch parts 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 3 5 5 3 1 1 2 1 3 2 1 3 1 2 3 1 2 3 1 2 1 2 1 2 Heat exchanger sensor Discharge temperature sensor TD 2 1 2 1 Thetmo sensor 2 1 2 1 Thermal fuse 77 C Transformer Indoor terminal block Outdoor terminal block Power supply 18YAH E 220 240V 50Hz 18YAH A 240V 50Hz Ferrite core GRN YEL GRN YEL Chassis BLK RED RED BLK BLK BLK RED C...

Page 8: ... Type Specifications Output Rated 2000W 2poles 1phase 220 240V 50Hz 1 Compressor PH280X3 4MS Winding resistance Ω Red Black White Black at 20 C 1 35 2 68 Output Rated 65W 6poles 1phase 220 240V 50Hz 2 Fan motor for outdoor MMF 230 65C Winding resistance Ω Red Black White Black at 20 C 71 2 139 0 3 Running capacitor for fan motor SK45FMP AC 450V 3 5µF 4 Running capacitor SK42CMP45U1 AC 420V 45µF fo...

Page 9: ...OR UNIT 0 39m Connecting pipe Ø12 7 0 49m Connecting pipe Ø6 35 5 REFRIGERANT CYCLE DIAGRAM Standard pressure Surface temp of heat 50Hz P exchanger interchanging Fan speed kg cm G pipe T1 C indoor 18YAH E A 18YKH E A Standard 21 0 53 0 High Heating High temperature 1 20 5 to 25 5 52 0 to 61 0 Low Low temperature 17 0 45 0 High Standard 3 0 9 0 High Cooling High temperature 3 5 11 0 High Low temper...

Page 10: ...ontrol Panel From Outdoor Unit CLOCK FREQUENCY 36 864kHz Remote Control Operation Display Timer Display ECONO Sign Display PRE DEF Sign Display Indoor Fan Motor Louver ON OFF Signal Louver Driver Louver Motor Power Supply Circuit Temperature Sensor Louver Control 3 minute Delay at Restart for Compressor Motor Revolution Control Processing Temperature Processing Timer Serial Signal Communication Se...

Page 11: ...ation Serial Signal Communication 4 Way Valve ON OFF Signal Compressor Compressor ON OFF Signal Outdoor Fan ON OFF Signal 4 Way Valve Magnetic Switch Power Supply Outdoor Fan Motor Relay Driver Photo Coupler Relay RY05 Relay RY07 Triac Initializing Circuit Power Supply Circuit Clock frequency Oscillator Circuit Transformer RAS 18YAH E AC220 240V 50Hz RAS 18YAH A AC240V 50Hz for Indoor Unit 6MHz 6 ...

Page 12: ... valve outdoor fan and operation display are controlled as shown in Fig 7 2 1 Fig 7 2 1 2 A cool operation is carried out when the indoor microcomputer sends the operation signal to the outdoor microcomputer 1 When the FAN is set to AUTO the indoor fan motor operates as shown in Fig 7 2 2 2 When the FAN is set to LOW MED or HIGH the indoor fan motor operates with a constant in volume as listed in ...

Page 13: ...ble 7 1 1 when the FAN is set to LOW MED or HIGH Fig 7 3 2 3 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 7 3 1 Louver Control 1 By pushing the SET button of the remote control during the operation the louver can be set to the desired position 2 When the AUTO button is pus...

Page 14: ...ig 7 4 1 The Fan mode will continue until room temperature reaches a level at which another mode is selected 7 4 1 Temporary Auto When the TEMPORARY button is pushed the set temperature is fixed at 24 C and controlled in accordance with the chart shown in Fig 7 4 1 Fig 7 4 1 7 5 ECONO Mode When the ECONO button is pushed during COOL HEAT and AUTO operation the OPERATION display is turned off and t...

Page 15: ...Operation 1 During the heating operation the indoor fan speed is controlled automatically in accordance with the indoor heat exchanger temperature to prevent blowing the cool air Control is performed as shown in Fig 7 8 1 Fig 7 8 1 2 As soon as the defrost operation starts the indoor fan stops 7 9 Defrost Operation During heat operation if the temperature Evaporat ing temperature detected by the o...

Page 16: ...itioner will be reported to the local power supplier before installation If you have any obscure problems or if the power supplier does not accept the installation of this appliance service agency will take adequate countermeasures For general public use Power supply cord of parts of appliance for outdoor use shall be more than polychloroprene sheathed flexible cord design H05 RN F or cord designa...

Page 17: ...hors or hole in anchors into them 2 Attach the installation plate to the wall by screwing bolts or nuts into the anchors However in the case where hole in anchors are used the depth of the holes should be adjusted so that the nut heads extend no more than 15 mm Fig 8 3 5 Anchor bolt Projection 15mm or less There may be a wire conduit embedded in the wall Confirm on the blue prints or ask the build...

Page 18: ...dew which forms on the back of the indoor unit to the drain pan Therefore do not store the power cord and other parts at a height above the drain guide Fig 8 3 17 8 3 7 Drainage 1 Run the drain hose sloping downwards NOTE Hole should be made at a slight downward slant to the outdoor side 50 mm or more Do not rise the drain hose Do not form the drain hose into the waved shape Do not put the drain h...

Page 19: ...ow to connect the power cord For the air conditioner that has no power cord connect a power cord to it as mentioned below Remove the electric parts cover from the outdoor unit 4 screws After removing the electric parts cover remove the cord clamp Connect and secure the power supply cord Fig 8 4 7 Stripping length of power cord L N 1 2 3 Screw Screw Terminal block Earth line Cord clamp Cord clamp P...

Page 20: ...hich the compressor is turned off but the compressor will not stop The compressor will not switch on or off even when the thermo control is operated in the dry operation The PRE DEF lamp comes on when the heating operation is started The outdoor fan stops once in the while during the heating operation Compressor does not work though room temperature is in the range of turning the compressor on Dur...

Page 21: ... flashing 5 Hz OPERATION display flashing 5 Hz OPERATION and TIMER display flashing 5 Hz OPERATION TIMER and PRE DEF display flashing 5 Hz OPERATION TIMER and PRE DEF display flashing 5 Hz Block display Power failure when power is ON Thermo sensor TA short break Heat exchanger sensor TC short break Indoor fan lock abnormality of indoor fan Indoor P C board failure Wrong wiring of connecting cable ...

Page 22: ...d on rear bottom of the wireless remote control with a tip of pencil for more than 3 seconds Make sure the setting temperature is displayed on the display and other display is turned off 2 Selecting ordinary mode Push the all clear button ACL on the rear bottom of the wireless remote control with a tip of pencil for more than 3 seconds Make sure the operation mode display wind volume display clock...

Page 23: ...hing This shows that the protection circuit on the indoor P C board is working d Operate the TEMP 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 TEMP key so that the display is increased one by one to conti...

Page 24: ...isplayed when error is detected Displayed when error is detected Displayed when error is detected Displayed when error is detected Displayed when error is detected Indicated when detected abnormal Judgment and action 1 Check the indoor temp sensor TA 2 Check the indoor P C board 1 Check the indoor temp sensor TC 2 Check the indoor P C board 1 Check the connector circuit for revolution speed input ...

Page 25: ...efer to the Characteristic diagram 10k at 25 C Replace Does LED Green on outdoor P C board flash Are circuit wires normal Outdoor P C board check Unsatisfied Satisfied Four way valve check Failure Circuit check modification CN11 220 240V Outdoor P C board check Failure Replace TC sensor Indoor P C board check Failure Has coil terminal 220 240V in heating Replace P C board Replace P C board Replace...

Page 26: ...Is indoor fan motor normal Is circuit wiring normal Doesn t inner over relay in compressor operate Wiring check modification Replacement failure of outdoor P C board Indoor P C board check Failure Freeze preventing operation Freeze preventing operation Indoor P C board check Failure Replace P C board Replace P C board Correct connection Modify connection of connector Replace condenser Replace fan ...

Page 27: ...eristic of TC sensor resistance value normal Indoor P C board check Failure Modify connection of connector Replace TC sensors Replace P C board Refer to Characteristic diagram 10k at 25 C YES YES NO NO Is connection of TE sensor connector normal Is characteristic of TE sensor resistance value normal Outdoor P C board check Failure Modify connection of connector Replace TE sensors Replace P C board...

Page 28: ...rmal Is characteristic of TD sensor resistance value normal Outdoor P C board check Failure Modify connection of connector Replace TL TD sensors Replace P C board Refer to Characteristic diagram 4 and 5 10k at 25 C YES NO YES YES 10k at 25 C Modify wiring connector connection Check and modify charged amount of refrigerant Make better delete the cause Replace TD sensor Replace P C board Outdoor P C...

Page 29: ... control failure Connect the wire properly Infrared rays receive parts or P C board failure Power transformer is failure Microcomputer is failure Refer to the figure below Refer to the figure below Replace Item by symptoms Remedies Probable main causes Check items Is the voltage display on the rear panel of the P C board normal 12V DC or 5V DC Replace Replace transformer Replace the P C board Repl...

Page 30: ...ge apply to between red and black lead of the motor Turn ON the power Stop the operation Is it possible to rotate the cross flow fan by hand Motor circuit D03 Q06 IC01 or 12V power circuit Q03 D01 failure When rotating the cross flow fan by hand at the operation stop condition is the rotation signal 12VDC 0V detected between 2 gray lead and 3 brown lead of the motor connector PJ13 or CN13 1 pulse ...

Page 31: ... transmission from indoor to outdoor is correctly performed based upon the following dia gram NOTE Measurement should be performed 2 minutes and 30 seconds after starting of the operation Be sure to prepare a diode for judgment Fig 9 3 2 Normal time Voltage swings between DC15 and 60V Abnormal time Voltage does not vary 2 Outdoor unit stops in a little while after operation started Check procedure...

Page 32: ...able 9 3 1 No Procedure 1 Disconnect the power plug from the AC outlet and remove the P C board assembly from the elec tronic parts base Remove the flat cable from the terminal plate 2 Turn the power ON If the OPERATION lamp flash 0 5 sec ON 0 5 sec OFF steps 1 3 in the right column are not necessary 3 Push the START STOP button once to set in operation mode Do not set to the fan only or on timer ...

Page 33: ... black motor connector leads 2 The motor does not rotate But the key operation of the remote control is accepted 3 Motor rotates but vibrates hard Trouble cause 1 The temperature of the indoor heat exchange unit is ex tremely low 2 Defective control P C board 1 Indoor fan motor is failure 2 Contact of the motor connector is defective 3 Main P C board is failure Table 9 3 2 Approximate value of the...

Page 34: ...itter pin D Reset input Pin 7 C Watchdog timer output CPU Pin 28 Power source R S SER Transformer primary side Temp fuse Transformer secondary side Light receiving unit Buzzer board Louver Fan revolution pulse input F TC sensor input E TA sensor input J Serial input LED Orange from outdoor K Serial output LED Green to outdoor MMC 1275 ...

Page 35: ...r ON 1 2 ON 1 2 ON 1 2 1 2 3 4 All off Check 18 and 19 See Table 2 1E Pipe sensor TD temp up protection 21 High pressure switch line circuit 20 Power line protective circuit Timer short operation Dip switch Check contents LED LED Normal operation ON 1 2 1 2 3 4 All off Check 1E and 21 See Table 1 18 Heat exchanger TE circuit 19 Pipe sensor TD circuit As follows Protective operation Three times Pro...

Page 36: ...d 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 terminal with a pencil wait about 10 seconds P C board is failure R...

Page 37: ...3T69019 Receiver Infrared Rays DK12 411 43T60032 Lead Assembly Display 9P 412 73T63021 P C Board Assembly Switch MCC 577 Location Part Description No No 413 43T60060 Cable Assembly 3P 414 43T37002 P C Board Assembly Buzzer MCC460 415 43T69004 Sensor Heat Exchanger 416 43T69005 Sensor Thermostat 417 43T69056 P C Board Assembly MCC 1293 429 43T60041 Fuse Set Thermal 430 43T60059 Housing Assembly Sec...

Page 38: ...18 43T39001 Band Motor Right Location Part Description No No 219 43T39013 Band Motor Left 220 43T39014 Base Bearing 221 43T44019 Evaporator 222 43T47006 Pipe Delivery 223 43T47016 Pipe Suction 224 43T22008 Bearing 225 43T19003 Holder Sensor 226 43T62025 Cover Electorical Parts 227 43T63002 Holder Remote Control 228 43T69058 Remote Control 229 43T70005 Hose Drain 3M 230 43070168 Hose Drain 231 43T8...

Page 39: ... AC220 240V 50Hz 10 2 Outdoor Unit Location Part Description No No 24 43T20010 Fan Propeller 490 25 43T46018 Coil V 4 Way AC220 240V LB6 26 43T69059 Sensor 27 43T69060 Sensor TD 28 43T52004 Switch Magnet FC 2S 29 43157238 Heater Crank case 30 43193065 Spring 31 43T60071 Fuse 32 43T60029 Fuse Set 30A 250V 33 43T55021 Capacitor 45MFD 420V 34 43T55014 Capacitor 3 5MFD 450V 35 43T58008 Transformer FT ...

Page 40: ...TOSHIBA CARRIER CORPORATION 336 TADEWARA FUJI SHI SHIZUOKA KEN 416 8521 JAPAN ...

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