Toshiba RAS-18YKH-E Service Manual
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Toshiba RAS-18YKH-E Service Manual

Toshiba RAS-18YKH-E Service Manual

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FILE NO. A00-0001

SERVICE MANUAL

AIR-CONDITIONER
SPLIT WALL TYPE
RAS-18YKH-E / RAS-18YAH-E
RAS-18YKH-A / RAS-18YAH-A
PRINTED IN THAILAND, Apr.,2000

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Summary of Contents for Toshiba RAS-18YKH-E

  • Page 1: Service Manual

    FILE NO. A00-0001 SERVICE MANUAL AIR-CONDITIONER SPLIT WALL TYPE RAS-18YKH-E / RAS-18YAH-E RAS-18YKH-A / RAS-18YAH-A PRINTED IN THAILAND, Apr.,2000...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ..................3 2. CONSTRUCTION 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.

  • Page 3: Specifications

    Interconnection pipe Maximum length (of one way) 2 (m) Maximum height difference ↑ Indoor unit ↓ Outdoor unit Codensate drain pipe Outer diameter (mm) INDOOR UNIT RAS-18YKH-E / RAS-18YKH-A Height (mm) Dimension Width (mm) 1050 Depth (mm) Net weight (kg)
  • Page 4 Note : • Capacity is based on the following temperature conditions. Condition JIS C9612-1994 Temperature Cooling Heating (DB) 27°C 20°C Indoor unit inlet air temperature (WB) 19°C — (DB) 35°C 7°C Outdoor unit inlet air temperature (WB) 24°C 6°C Notes : CHARGELESS •...

  • Page 5: Construction Views

    2. CONSTRUCTION VIEWS 2-1. Indoor Unit RAS-18YKH-E, RAS-18YKH-A Indoor heat exchanger Deodorizing filter Dust collecting filter Air filter Air inlet 1050 Air outlet Power cord (1,7m) Front panel Rear plate Wireless remote control 1040 Hanger Remote control holder 59.6 Drain hose...

  • Page 6: Outdoor Unit

    2-2. Outdoor Unit RAS-18YAH-E, RAS-18YAH-A Ø25 Drain outlet 4–Ø12 x 18 hole (for Ø8–Ø10 anchor bolt) Electric Parts cover Handle Liquid side (Flare Ø6,35) Gas side (Flare Ø15,88) Service port 340 (pitch) Handle Detail Drawing Mounting dimension of anchor bolt Air inlet 100 or more 600 or more...

  • Page 7: Wiring Diagram

    3. WIRING DIAGRAM Louver Thermal fuse motor Switch parts Indication parts 164˚C CN16 1 2 3 4 5 6 7 8 9 Fan motor CN25 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9...

  • Page 8: Specifications Of Electrical Parts

    4. SPECIFICATIONS OF ELECTRICAL PARTS 4-1. Indoor Unit RAS-18YKH-E, RAS-18YKH-A Parts name Type Specifications Output (Rated) 31W, 2poles, DC35V, 19W Fan motor (for indoor) AFP-220-31-4B Red-Black White-Black Winding resistance (Ω) (at 20°C) 267,8 147,7 Thermo. sensor (TA-sensor) (microprocessor) 10kΩ at 25°C...

  • Page 9: Refrigerant Cycle Diagram

    5. REFRIGERANT CYCLE DIAGRAM INDOOR UNIT A (Note) Indoor heat Maximum pipe length is 15m exchanger Maximum pipe head is Cooling 0,39m 0,49m Heating (Connecting pipe) (Connecting pipe) Ø12,7 Ø6,35 Cross flow fan O.D. : 12,7mm O.D. : 6,35mm Packed valve Packed valve (Ø12,7) (Ø6,35)

  • Page 10: Control Block Diagram

    M.C.U Indoor Unit Control Panel Heat Exchanger Sensor Functions Operation • Louver Control Temperature Sensor Display Infrared Rays Signal Receiver • 3-minute Delay at Restart for Compressor Timer Display Infrared • Motor Revolution Control Initializing Circuit Rays ECONO. CLOCK FREQUENCY 36,864kHz Sign Display Clock Frequency Remote Control...
  • Page 11 C.P.U Discharge 4-Way Valve 4-Way Relay Temperature ON/OFF Signal RY05 Valve Sensor Relay Driver Heat Magnetic Compressor Relay Exchanger Compressor RY07 Switch ON/OFF Signal Sensor Outdoor Outdoor Fan Photo Triac ON/OFF Signal Coupler Fan Motor Power Initializing Circuit Supply (for Indoor Unit) •...

  • Page 12: Operation Description

    7. OPERATION DESCRIPTION 7-1. FAN ONLY Operation 7-2. COOL Operation (MODE of the remote control : FAN ONLY) (MODE of the remote control : COOL) (1) Fan speed setting (1) Compressor, 4-way valve, outdoor fan and operation display are controlled as shown in Fig. 1) When the FAN is set to AUTO, the indoor fan 7-2-1.

  • Page 13: Heat Operation

    7-3. HEAT Operation 7-3-1. Louver Control (MODE of the remote control : HEAT) (1) By pushing the SET button of the remote control during the operation, the louver can be set to the (1) Compressor, 4-way valve, outdoor fan and desired position.
  • Page 14 7-4. AUTO Operation 7-4-1. Temporary Auto (MODE of the remote control : AUTO) When the TEMPORARY button is pushed, the set temperature is fixed at 24°C and controlled in (1) One of the 3 modes, Cooling, Fan only and accordance with the chart shown in Fig. 7-4-1. Heating is selected according to room tempera- ture at which operation is to start, as shown in Fig.
  • Page 15 7-6. High-Temperature Limit Control 7-8. Cool Airflow Prevention Control (Heating Operation) (Heating Operation) The microprocessor detects the indoor heat ex- (1) During the heating operation, the indoor fan changer temperature so as to prevent exceeding the speed is controlled automatically in accordance condensate pressure.

  • Page 16: Installation Procedure

    8-2-1. Optional Installation Parts • After unpacking the unit, examine it carefully for possible damage. If you detect any damage, do not install the unit. Contact your Toshiba dealer immediately. Part code Parts name Q’ty...
  • Page 17 8-3. Indoor Unit 8-3-3. Cutting a Hole and Mounting • In the case of a reinforced concrete wall CAUTION (1) In the selected area on the reinforced concrete wall, Installation Plate 8-3-1. Installation Place bore holes at intervals of 450 mm, and drive •...
  • Page 18 8-3-7. Drainage 8-3-9. Check and Test Operation Underside connection with piping ¨ 1. Cut out the knock-out piece from the right below of 1. Run the drain hose sloping downwards. 1. Check the unit is firmly hooked up on the the rear plate with a knife, etc.
  • Page 19 Outer dia. Tightening Additional Model RAS-18YAH-E RAS-18YAH-A (mm) torque tightening torque (RAS-18YKH-E) (RAS-18YKH-A) 8-4-1. Installation Place How to connect the power cord 6,35 16 (1,6 kgf•m) 18 (1,8 kgf•m) Power source 50 Hz ~, 220 – 240V 50 Hz ~, 240V 12,7 49 (5,0 kgf•m)

  • Page 20: Troubleshooting Chart

    9. TROUBLESHOOTING CHART 9-1-2. Incorrect Cable Connection between Troubleshooting Procedures : Indoor and Outdoor Units • Following details of “What to be pre-checked The indoor unit is connected to the outdoor unit with first”, make sure of the basic items. 4 cables.
  • Page 21 9-2. Primary Judgment of Trouble 9-2-2. Display of Abnormalities and Judgement of the Abnormal Spots Sources The indoor unit of this machine observes the opera- 9-2-1. Role of Indoor Unit Control tion condition of the air conditioner and displays the contents of the self-diagnosis as block displays on The indoor unit controller receives the operation commands from the remote control and assumes...
  • Page 22 (2) Self-diagnosis with remote control 2) Selecting ordinary mode With the indoor unit control, self-diagnosis of Push the all clear button (ACL) on the rear protective circuit action can be done by turning bottom of the wireless remote control with a the remote control operation into service mode, tip of pencil for more than 3 seconds.
  • Page 23 <Self-diagnosis by check codes> c) At the same time, also make sure the opera- tion lamp is also flashing. This shows that 1) The self-diagnosis by the check codes is con- the protection circuit on the indoor P.C. board ducted under the block displays of item B-H in is working.
  • Page 24 Table 9-2-4 Block level Diagnosis function Check Check Judgment and action Block Symptom Conditioner Condition code code status Indoor temp. (TA) sensor is Operation Displayed when Indoor P.C. 1. Check the indoor temp. sensor (TA). board out of place. continues. error is detected.

  • Page 25: Judgment Of Trouble By Every Symptom

    Details of Table 9-2-2 Judgment of Trouble by Every Symptom [04 Serial signal error] Does outdoor unit operate? Are 1, 2, and 3 crossover Correct crossover wires. wires normal? Correct connection Is connection of of connector. connector normal? Does LED (Orange) on outdoor P.C.
  • Page 26 [09 Other cycle error] (1) Does compressor operate? Doesn't Check charged amount of refrigerant. Does compressor inner over-relay Check abnormal overload. tune off halfway? (in compressor) Trouble on compressor operate? Is characteristic of Replace TC sensor resistance compressor value normal? •...
  • Page 27 [0C Indoor TA sensor error] Is connection of CN04 Modify connection TA sensor connector normal? of connector. Is characteristic of TA sensor Replace resistance value normal? TA sensors. • Refer to Characteristic diagram. 10k at 25˚C Indoor P.C. board check Replace Failure P.C.
  • Page 28 [19 Outdoor TD sensor error] Is connection of TD sensor Modify connection connector normal? of connector. Is characteristic of TD sensor Replace resistance value normal? TL/TD sensors. • Refer to Characteristic diagram 4 and 5. 10k at 25˚C Outdoor P.C. board check Replace Failure P.C.

  • Page 29: Troubleshooting Flowcharts

    9-3. Troubleshooting Flowcharts 9-3-1. Power cannot be Turned on (No Operation at All) < Preliminary checks > Operations (1) Is the supply voltage normal? Check items (2) Is the connection to the AC output OK? Probable (3) Are the connection of the primary side and the secondary main causes side of the power transformer inserted into the P.C.
  • Page 30 9-3-2. Only the Indoor Fan does not Operate < Preliminary checks > Does it neither work in COOL or FAN ONLY operation? < Checking procedure > Turn OFF the power (“REMOTE CONTROL” position) Turn ON the power (“REMOTE CONTROL” position) Does the fan stop at the Replace the Control P.C.
  • Page 31 9-3-3. Wiring Failure (Interconnecting and Serial Signal Wire) (1) Outdoor unit does not operate ‚ ƒ 1) Is the voltage between of the indoor terminal block varied? Confirm that transmission from indoor to outdoor is correctly performed based upon the following dia- gram.
  • Page 32 9-3-4. How to Check the P.C. Board a. Main P.C. board part: Power relay, indoor fan motor drive circuit and (1) Operating precautions control circuit, C.P.U. and peripheral circuits, 1) When removing the front panel or the P.C. buzzer drive circuit and buzzer. board, be sure to disconnect the power plug b.
  • Page 33 Procedure Check point (Symptom) Trouble cause Push the START/STOP button once 1. The compressor does not operate. 1. The temperature of the indoor to set in operation mode. heat exchange unit is ex- 2. The OPERATION lamp flashes. tremely low. 1.
  • Page 34 Indoor Printed Circuit Board (P.C.B.) 5V-power source transistor (emitter pin) MMC-1293 12V-power source transistor (emitter pin) Reset input (Pin 7) Watchdog timer output Switch board (CPU Pin 28) Power source (R.S.SER) Transformer primary side Temp. fuse Transformer secondary side Light-receiving unit Buzzer board Louver Fan revolution...
  • Page 35 9-3-6. Judgment by LED Display on Outdoor P.C. Board When the check code is checked at the outdoor unit side, the following indications are available by LED and Dip switch (DSW01). Table 9-3-3 LED display and check code Dip switch 4 Yellow 1 Red 2 Yellow...
  • Page 36 9-4. How to Check the Remote Control (Including the Indoor P.C. Board) There is no beep from the indoor unit. Push the START/STOP button. The operation lamp of the air conditioner main unit does not light. Does the transmission indicator flash? Short-circuit the metal terminal at the side of the battery compartment...

  • Page 37: Exploded Views And Parts List

    10. EXPLODED VIEWS AND PARTS LIST 10-1. Indoor Unit (1) Location Part Location Part Description Description 43061192 Base, E-Parts 43T60060 Cable Assembly, 3P 43T69022 P.C. Board Assembly, 43T37002 P.C. Board, Assembly, Transformer MCC-602 Buzzer, MCC460 43T61003 Base, Display 43T69004 Sensor, Heat Exchanger 43T60001 Terminal Block, 2P 43T69005 Sensor, Thermostat 43T60002 Terminal Block, 3P...
  • Page 38 Indoor Unit (2) Location Part Location Part Description Description 43T03009 Panel Assembly, Front 43T39013 Band, Motor (Left) 43T03003 Body, Back, Assembly 43T39014 Base, Bearing 43007181 Latch, Plastic 43T44019 Evaporator 43T19015 Bushing, Body (Right) 43T47006 Pipe, Delivery 43T19016 Bushing, Body (Left) 43T47016 Pipe, Suction 43T07019 Arm 43T22008 Bearing...
  • Page 39 10-2. Outdoor Unit 31, 32 17, 25 31,32 35 Location Part Location Part Description Description 43T00024 Panel, Air Outlet 43T20010 Fan, Propeller, 490 43T00025 Panel, Front 43T46018 Coil, V-4 Way AC220–240V, 43T00026 Panel, Side 43T69059 Sensor 43T42002 Base Assembly 43T69060 Sensor, TD 43T19012 Guard, Fin 43T52004 Switch, Magnet, FC-2S 43T19011 Guard, Fan...
  • Page 40 TOSHIBA CARRIER CORPORATION 336 TADEWARA FUJI-SHI, SHIZUOKA-KEN, 416-8521, JAPAN...

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