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Toshiba RAS-24NKHD-E4 Service Manual
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Toshiba RAS-24NKHD-E4 Service Manual

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FILE NO. SVM-05016-1

SERVICE MANUAL

AIR CONDITIONER

SPLIT WALL TYPE
RAS-24NKHD-E4 / RAS-24UAH-E4
RAS-18NKHD-E4 / RAS-18UAH-E4
RAS-24NKD-E4 / RAS-24UA-E4
RAS-18NKD-E4 / RAS-18UA-E4
RAS-24NKD-AR4 / RAS-24UA-AR4
RAS-18NKD-AR4 / RAS-18UA-AR4
RAS-24NKDX4 / RAS-24UAX4
RAS-18NKDX4 / RAS-18UAX4
RAS-24NKDX4-T / RAS-24UAX3-T1
RAS-18NKDX4-T2 / RAS-18UAX4-T2
18 Class
18 Class
24 Class
(Heat pump model)
(Cooling only model)
June 2005

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Summary of Contents for Toshiba RAS-24NKHD-E4

  • Page 1: Service Manual

    FILE NO. SVM-05016-1 SERVICE MANUAL AIR CONDITIONER SPLIT WALL TYPE RAS-24NKHD-E4 / RAS-24UAH-E4 RAS-18NKHD-E4 / RAS-18UAH-E4 RAS-24NKD-E4 / RAS-24UA-E4 RAS-18NKD-E4 / RAS-18UA-E4 RAS-24NKD-AR4 / RAS-24UA-AR4 RAS-18NKD-AR4 / RAS-18UA-AR4 RAS-24NKDX4 / RAS-24UAX4 RAS-18NKDX4 / RAS-18UAX4 RAS-24NKDX4-T / RAS-24UAX3-T1 RAS-18NKDX4-T2 / RAS-18UAX4-T2...

  • Page 2: Table Of Contents

    RAS-24NKDX4-T / RAS-24UAX3-T1 RAS-18NKD-E4 / RAS-18UA-E4, RAS-18NKDX4 / RAS-18UAX4 RAS-18NKD-AR4 / RAS-18UA-AR4 RAS-18NKDX4-T2 / RAS-18UAX4-T2 SPECIFICATION OF ELECTRICAL PARTS Indoor Unit (RAS-24NKHD-E4, RAS-18NKHD-E4) Outdoor Unit (RAS-24UAH-E4) Outdoor Unit (RAS-18UAH-E4) Indoor Unit (RAS-24NKD-E4, RAS-24NKDX4, RAS-24NKD-AR4, RAS-24NKDX4-T , RAS-18NKD-E4, RAS-18NKDX4, RAS-18NKD-AR4, RAS-18NKDX4-T2)
  • Page 3 FILE NO. SVM-05016 OPERATION DESCRIPTION Outline of Air Conditioner Control Description of Operation Circuit Hi POWER Mode High-Temperature Limit Control Low-Temperature Limit Control Defrosting Operation Auto Restart Function Filter Check Lamp Self-Cleaning function 7-10 QUIET Mode 7-11 COMFORT SLEEP mode INSTALLATION PROCEDURE Safety Cautions Installation Diagram of Indoor and Outdoor Units...

  • Page 4: Specifications

    FILE NO. SVM-05016 1. SPECIFICATIONS RAS-24NKD-E4 RAS-24NKDX4 RAS-24NKD-AR4 RAS-24NKDX4-T RAS-24NKHD-E4 MODEL RAS-24UAX4 RAS-24UAH-E4 RAS-24UA-AR4 RAS-24UA X3-T1 RAS-24UA-E4 ITEM Cooling Heating Cooling Cooling Cooling Cooling 220 V 240 V 220 V 240 V 220 V 240 V 220 V 240 V...
  • Page 5 FILE NO. SVM-05016 RAS-18NKHD-E4 RAS-18NKD-E4 RAS-18NKDX4 RAS-18NKD-AR4 RAS-18NKDX4-T2 MODEL RAS-18UAH-E4 RAS-18UA-E4 RAS-18UAX4 RAS-18UA-AR4 RAS-18UAX4-T2 ITEM Cooling Heating Cooling Cooling Cooling Cooling 220 V 240 V 220 V 240 V 220 V 240 V 220 V 240 V 220 V 240 V 220 V Capacity 5.05 5.05 5.80 5.90...
  • Page 6 7°C Outdoor unit inlet air temperature (WB) 24°C 6°C Note : 2 • Charge refrigerant according to the table below. RAS-24NKHD-E4 / RAS-24UAH-E4 RAS-18NKHD-E4 / RAS-18UAH-E4 RAS-24NKD-E4 / RAS-24UA-E4 RAS-18NKD-E4 / RAS-18UA-E4 Refrigerant RAS-24NKDX4 / RAS-24UAX4 RAS-18NKDX4 / RAS-18UAX4 RAS-24NKD-AR4 / RAS-24UA-AR4...

  • Page 7: Construction Views

    FILE NO. SVM-05016 2. CONSTRUCTION VIEWS 2-1. Indoor Unit Back body Front panel Air filter Heat exchanger Plasma air purifier Air inlet Grille inlet Air outlet Knock out system Knock out system Connection pipe (0.49 m) Connection pipe (0.39 m) (Flare ∅6.35) (For 24 series and RAS-18NKDX4-T2 : Flare ∅15.88) Drain hose (0.54 m)

  • Page 8: Outdoor Unit (Ras-24Uah-E4, Ras-24Ua-E4, Ras-24Uax4, Ras-24Ua-Ar4, Ras-24Uax3-T1, Ras-18Uax4-T2)

    FILE NO. SVM-05016 2-2. Outdoor Unit (RAS-24UAH-E4, RAS-24UA-E4, RAS-24UAX4, RAS-24UA-AR4, RAS-24UAX3-T1, RAS-18UAX4-T2) – 7 –...
  • Page 9 FILE NO. SVM-05016 2-3. Outdoor Unit (RAS-18UAH-E4) – 8 –...

  • Page 10: Outdoor Unit (Ras-18Ua-E4, Ras-18Uax4, Ras-18Ua-Ar4)

    FILE NO. SVM-05016 2-4. Outdoor Unit (RAS-18UA-E4, RAS-18UAX4, RAS-18UA-AR4) 32.5 A Detail Drawing (Back Leg) B Detail Drawing (Front Leg) ∅6 Hole ∅6 Hole ∅11x14 Hole R5.5 ∅30 Drain outlet 2-∅11x14 Hole (For ∅8-∅10 anchor bolt) FAN GUARD ∅436 COVER PV Electrical part cover Liquid side...

  • Page 11: Wiring Diagram

    FILE NO. SVM-05016 3. WIRING DIAGRAM 3-1. RAS-24NKHD-E4 / RAS-24UAH-E4 COLOR IDENTIFICATION BRW : BROWN Louver RED : RED motor Infrared rays receive WHI : WHITE : YELLOW and Indication parts BLU : BLUE BLK : BLACK CN25 GRY : GRAY...

  • Page 12: Ras-18Nkhd-E4 / Ras-18Uah-E4

    FILE NO. SVM-05016 3-2. RAS-18NKHD-E4 / RA S-18UA H-E4 COLOR IDENTIFICATION BRW : BROWN Louver RED : RED motor Infrared rays receive WHI : WHITE : YELLOW and Indication parts BLU : BLUE BLK : BLACK CN25 GRY : GRAY DRN : ORANGE GRN : GREEN GRN&YEL : GREEN &...

  • Page 13: Ras-24Nkd-E4 / Ras-24Ua-E4, Ras-24Nkd-Ar4 / Ras-24Ua-Ar4

    FILE NO. SVM-05016 3-3. RAS-24NKD-E4 / RAS-24UA-E4, RAS-24NKD-AR4 / RAS-24UA-AR4 RAS-24NKDX4 / RAS-24UAX4 Louver COLOR IDENTIFICATION motor BRW : BROWN Infrared reys receive RED : RED and Indication parts WHI : WHITE : YELLOW CN25 BLU : BLUE BLK : BLACK GRY : GRAY DRN : ORANGE GRN : GREEN...

  • Page 14: Ras-24Nkdx4-T / Ras-24Uax3-T1

    FILE NO. SVM-05016 3-4. RAS-24NKDX4-T / RAS-24UAX3-T1 Louver COLOR IDENTIFICATION motor BRW : BROWN Infrared rays receive RED : RED and Indication parts WHI : WHITE : YELLOW CN25 BLU : BLUE BLK : BLACK GRY : GRAY DRN : ORANGE GRN : GREEN GRN&YEL : GREEN &...

  • Page 15: Ras-18Nkd-E4 / Ras-18Ua-E4, Ras-18Nkdx4 / Ras-18Uax4 Ras-18Nkd-Ar4 / Ras-18Ua-Ar4

    FILE NO. SVM-05016 3.5 RAS-18NKD-E4 / RAS-18UA-E4, RAS-18NKDX4 / RAS-18UAX4 RAS-18NKD-AR4 / RAS-18UA-AR4 Louver COLOR IDENTIFICATION motor BRW : BROWN Infrared rays receive RED : RED and Indication parts WHI : WHITE : YELLOW CN25 BLU : BLUE BLK : BLACK GRY : GRAY DRN : ORANGE GRN : GREEN...

  • Page 16: Ras-18Nkdx4-T2 / Ras-18Uax4-T2

    FILE NO. SVM-05016 3-6. RAS-18NKDX4-T2 / RAS-18UAX4-T2 COLOR IDENTIFICATION Louver BRW : BROWN motor Infrared rays receive RED : RED and Indication parts WHI : WHITE : YELLOW CN25 BLU : BLUE BLK : BLACK GRY : GRAY DRN : ORANGE GRN : GREEN GRN&YEL : GREEN &...

  • Page 17: Specification Of Electrical Parts

    FILE NO. SVM-05016 4. SPECIFICATION OF ELECTRICAL PARTS 4-1. Indoor Unit (RAS-24NKHD-E4, RAS-18NKHD-E4) Parts name Type Specifications AC 200 − 240V, 31W Fan motor (for indoor) AFS-220-31A Thermo sensor (TA-sensor) ——— 10 kΩ at 25°C µRM1260V Micro Power Module (M01)

  • Page 18: Outdoor Unit (Ras-18Uah-E4)

    FILE NO. SVM-05016 4-3. Outdoor Unit (RAS-18UAH-E4) Parts name Type Specifications Output (Rated) 1500 W, 2 poles, 1 phase, 220 – 240 V, 50 Hz Compressor 2JS350D5DA02 Winding resistance (Ω) (at 20°C) 0.981 2.845 Output (Rated) 65 W, 6 poles, 1 phase, 220 – 240 V, 50 Hz Fan motor (for outdoor) KFG6-71SB5P-T3 Winding resistance (Ω) Red-Black...

  • Page 19: Outdoor Unit (Ras-24Ua-E4, Ras-24Uax4, Ras-24Uax3-T1)

    FILE NO. SVM-05016 4-5. Outdoor Unit (RAS-24UA-E4, RAS-24UAX4, RAS-24UAX3-T1 Parts name Type Specifications Output (Rated) 2200 W, 2 poles, 1 phase, 220 − 240 V, 50 Hz Compressor PH400X3CS-4KT1 Winding resistance (Ω ) (at 20 °C) 2.10 1.13 Output (Rated) 65 W, 6 poles, 1 phase, 220 − 240 V, 50 Hz Winding resistance (Ω...

  • Page 20: Outdoor Unit (Ras-18Uax4, Ras-18Ua-E4)

    FILE NO. SVM-05016 4-7. Outdoor Unit (RAS-18UAX4, RAS-18UA-E4) Parts name Type Specifications Output (Rated) 1500 W, 2 poles, 1 phase, 220 – 240 V, 50 Hz Compressor PH340X3C-4KT1 Winding resistance (Ω) (at 20°C) 1.46 2.47 Output (Rated) 42 W, 6 poles, 1 phase, 220 – 240 V, 50 Hz Fan motor (for outdoor) WLF-240-42A-1 Winding resistance (Ω)

  • Page 21: Outdoor Unit (Ras-18Uax4-T2)

    FILE NO. SVM-05016 4.9. Outdoor Unit (RAS-18UAX4-T2) Parts name Type Specifications Output (Rated) 1500 W, 2 poles, 1 phase, 220 – 240 V, 50 Hz Compressor PH290X2C-4FT1 Winding resistance (Ω) (at 20°C) 1.71 3.09 Output (Rated) 65 W, 6 poles, 1 phase, 220 – 240 V, 50 Hz Fan motor (for outdoor) KFG6-71SB5P-T Winding resistance (Ω)

  • Page 22: Refrigeration Cycle Diagram

    FILE NO. SVM-05016 5. REFRIGERATION CYCLE DIAGRAM 5-1. RAS-24NKHD-E4 / RAS-24UAH-E4 Indoor unit Evaporator Cooling 0.39 m 0.49 m Heating (Connecting pipe) (Connecting pipe) ∅15.88 ∅6.35 Cross flow fan O.D.:15.88 mm O.D.:6.35 mm Packed valve Packed valve (∅15.88) (∅6.35) Gas container connection (Reinstall etc.)

  • Page 23: Ras-18Nkhd-E4 / Ras-18Uah-E4

    FILE NO. SVM-05016 5-2. RAS-18NKHD-E4 / RAS-18UAH-E4 Indoor unit Evaporator Cooling 0.39 m 0.49 m Heating (Connecting pipe) (Connecting pipe) ∅12.7 ∅6.35 Cross flow fan O.D.:12.7 mm O.D.:6.35 mm Packed valve Packed valve (∅12.7) (∅6.35) Gas container connection (Reinstall etc.) Heating Cooling 4-way valve...

  • Page 24: Ras-24Nkd-E4 / Ras-24Ua-E4

    FILE NO. SVM-05016 5-3. RAS-24NKD-E4 / RAS-24UA-E4, RAS-24NKDX4 / RAS-24UAX4, RAS-24NKDX4-T / RAS-24UAX3-T1 Indoor unit Evaporator Cooling 0.39 m 0.49 m (Connecting pipe) (Connecting pipe) ∅15.88 ∅6.35 Cross flow fan O.D.:15.88 mm O.D.:6.35 mm Packed valve Packed valve (∅15.88) (∅6.35) Gas container connection (Reinstall etc.) Compressor PH400X3CS-4KT1...

  • Page 25: Ras-18Nkd-E4 / Ras-18Ua-E4

    FILE NO. SVM-05016 5-4. RAS-18NKD-E4 / RAS-18UA-E4, RAS-18NKDX4 / RAS-18UAX4 Indoor unit Evaporator 0.39 m 0.49 m (Connecting pipe) (Connecting pipe) ∅12.7 ∅6.35 Cross flow fan O.D.:12.7 mm O.D.:6.35 mm Packed valve Packed valve (∅12.7) (∅6.35) Capillary tube ∅2.0x1400 s PH340X3C-4KT1 Compressor Dryer...
  • Page 26 FILE NO. SVM-05016 5-5. RAS-18NKD-AR4 / RAS-18UA-AR4 Indoor unit Evaporator 0.49 m 0.39 m (Connecting pipe) (Connecting pipe) ∅6.35 ∅12.7 Cross flow fan O.D.:12.7 mm O.D.:6.35 mm Packed valve Packed valve (∅12.7) (∅6.35) Accumulator Capillary tube ∅2.0x1000 s Capillary tube Compressor PH340X3C-4KTS1 ∅0.8x1200 s Condenser...

  • Page 27: Ras-24Nkd-Ar4 / Ras-24Ua-Ar4

    FILE NO. SVM-05016 5-6. RAS-24NKD-AR4 / RAS-24UA-AR4 Indoor unit Evaporator Cooling 0.39 m 0.49 m (Connecting pipe) (Connecting pipe) ∅15.88 ∅6.35 Cross flow fan O.D.:15.88 mm O.D.:6.35 mm Packed valve Packed valve (∅15.88) (∅6.35) Gas container connection (Reinstall etc.) Capillary tube ∅0.8x400 l Accumulator Capillary tube...

  • Page 28: Ras-18Nkdx4-T2 / Ras-18Uax4-T2

    FILE NO. SVM-05016 5-7. RAS-18NKDX4-T2 / RAS-18UAX4-T2 Indoor unit Evaporator 0.49 m 0.39 m (Connecting pipe) (Connecting pipe) ∅15.88 ∅6.35 Cross flow fan O.D.:15.88 mm O.D.:6.35 mm Packed valve Packed valve (∅15.88) (∅6.35) Capillary tube Accumulator ∅2.0x800 s PH290X2C-4FT1 Compressor Condenser Refrigerant R22 1.47 kg...

  • Page 29: Control Block Diagram

    FILE NO. SVM-05016 6. CONTROL BLOCK DIAGRAM 6-1. RAS-24NKHD-E4, RAS-18NKHD-E4 Indoor Unit Control Panel M.C.U. Operation Display Functions Heat Exchanger Sensor • Louver Control Timer Display Temperature Sensor • 3-minute Delay at Restart for Compressor Filter Sign Display Infrared Rays Signal Receiver •...

  • Page 30: Ras-18Nkd-E4 / Ras-18Ua-E4, Ras-18Nkdx4 / Ras-18Uax4 Ras-18Nkd-Ar4 / Ras-18Ua-Ar4, Ras-18Nkdx4-T2 / Ras-18Uax4-T2

    FILE NO. SVM-05016 6-2. RAS-18NKD-E4 / RAS-18UA-E4, RAS-18NKDX4 / RAS-18UAX4 RAS-18NKD-AR4 / RAS-18UA-AR4, RAS-18NKDX4-T2 / RAS-18UAX4-T2 RAS-24NKD-E4 / RAS-24UA-E4, RAS-24NKDX4 / RAS-24UAX4 RAS-24NKD-AR4 / RAS-24UA-AR4, RAS-24NKDX4-T / RAS-24UAX3-T1 Indoor Unit Control Panel M.C.U. Operation Functions Display Heat Exchanger Sensor • Louver Control Timer Display Temperature Sensor...

  • Page 31: Operation Description

    FILE NO. SVM-05016 7. OPERATION DESCRIPTION • Turning off the compressor and outdoor fan 7-1. Outline of Air Conditioner Control when the outdoor unit receives the shutdown This is a fixed capacity type air conditioner, which uses command a AC motor for an indoor fan. The AC motor drive •...

  • Page 32: Description Of Operation Circuit

    FILE NO. SVM-05016 7-2-2. Cooling operation 7-2. Description of Operation Circuit ([MODE] button on the remote control is set (1) When turning on the breaker, the operation lamp to the cooling operation.) blinks. This means that the power is on (or the (1) The compressor, 4-way valve, outdoor fan and power supply is cut off.) operation display lamp are controlled as shown in...
  • Page 33 FILE NO. SVM-05016 7-2-4. Heating operation *Heat pump model only 7-2-3. Dry operation ([MODE] button on the remote control is set ([MODE] button on the remote control is set to the dry operation.) to the heating operation.) (1) The compressor, 4-way valve, outdoor fan and (1) The compressor, 4-way valve, outdoor fan and operation display lamp are controlled as shown in operation display lamp are controlled as shown in...

  • Page 34: Cooling Operation

    Fan only operation *4: Calculated from difference in motor speed between SUL and HIGH. Fig. 7-2-8 Cold draft preventing control Heating operation *5 and *6: RAS-24NKD-E4, RAS-24NKDX4 RAS-24NKHD-E4 RAS-24NKD-AR4, RAS-24NKDX4-T RAS-18NKHD-E4 RAS-18NKD-E4, RAS-18NKDX4 Table 7-2-1 RAS-18NKD-AR4, RAS-18NKDX4-T2 Fig. 7-2-9 speed...
  • Page 35 FILE NO. SVM-05016 (1) Operation flow chat. START OPERATION LED ON PAP LED ON Less than 1 hour Indoor fan ON 1 hour later Air-Purlfier OFF Air-Purlfier ON Error after 1 minute Error within 1 minute Operation confirm PAP LED ON FILTER LED ON No error Air-Purifier OFF...
  • Page 36 FILE NO. SVM-05016 (2) The indoor fan motor and Plasma Air-Purifier operation. • When Plasma Air-Purifier has been operated with other operation of air conditioner mode (Fan only, AUTO, Cooling, Dry or Heat). The speed revolution of indoor fan is based upon the operated mode of air conditioner. In fact, Plasma Air-Purifier works continuously.
  • Page 37 FILE NO. SVM-05016 7-3. Hi PO WER Mode 7-4. High-Temperature Limit Control ([Hi PO WER] b utton on the remote *Heat pump model only contr ol is pressed.) The microcontroller detects the indoor heat exchanger temperature to prevent pressure of a refrigerating cycle When [Hi PO WER] b utton is pressed while the indoor...
  • Page 38 FILE NO. SVM-05016 7-6-1. Defrost starting condition 7-6-2. Defrost finish condition. 1) If Te ≥ 3°C at least 60 sec -->4 way value on. A-Zone : If -10°C > Teo ≥ − 18°C, defrost will 2) If Te ≥ 8°C --> 4 way value on. start when.

  • Page 39: Auto Restart Function

    FILE NO. SVM-05016 7-7-1. How to set auto restart function 7-7. Auto Restart Function To set the auto restart function, proceed as follows: The indoor unit is equipped with an automatic The power supply to the unit must be on; the function restarting function which allows the unit to restart will not set if the power is off.

  • Page 40: Filter Check Lamp

    FILE NO. SVM-05016 7-7-2. How to cancel auto restart function To cancel auto restart function, proceed as follows: Repeat the setting prodedure: the unit receives the signal and beeps three times. The unit will be required to be turned on with the remote control after the main power supply is turned off.
  • Page 41 FILE NO. SVM-05016 7-9. Self-Cleaning function. Self-Cleaning function is designed to reduce humidity that causes mold to form inside the air conditioning unit. This advanced, efficient system reduces moisture in the coil. When you turn off your air conditioner, the internal fan activates and dries the moisture in the coil for 20 minutes, then turns off automatically.

  • Page 42: Quiet Mode

    FILE NO. SVM-05016 7-10. QUIET Mode 7-11-1. Cooling mode • The fan speed of indoor unit operates automatically, Quiet mode is the system which, control the it relates with the compressor's operation. revolving speed of indoor fan to work constantly at lower than speed L.

  • Page 43: Installation Procedure

    Also, make sure the equipment is properly earthed. • Appliance shall be installed in accordance with national wiring regulations. If you detect any damage, do not install the unit. Contact your TOSHIBA dealer immediately. CAUTION • Exposure of unit to water or other moisture before installation could result in electric shock.
  • Page 44 FILE NO. SVM-05016 REQUIREMENT OF REPORT TO THE LOCAL POWER SUPPLIER Please make absolutely sure that the installation of this appliance is reported to the local power supplier before installation. If you experience any problems, or if the installation is not accepted by the supplier, the service agency will take adequate countermeasures.

  • Page 45: Installation Diagram Of Indoor And Outdoor Units

    FILE NO. SVM-05016 8-2. Installation Diagram of Indoor and Outdoor Units 1 Installation For the rear left and left piping Hook plate Wall Insert the cushion between the indoor unit and wall, and Hook tilt the indoor unit for better operation.
  • Page 46 FILE NO. SVM-05016 8-3. Installation 8-3-1. Optional installation parts Part Parts name Q'ty Code Refrigerant piping Liquid side : ∅6.35 mm : ∅12.70 mm (18 series except RAS-18NKDX4-T2 / RAS-18UAX4-T2) Gas side each : ∅15.88 mm (24 series and RAS-18NKDX4-T2 / RAS-18UAX4-T2) Pipe insulating material (polyethylene foam, 6 mm thick) Putty, PVC tapes...
  • Page 47 FILE NO. SVM-05016 8-3-2. Accessory and installation parts Part Part Part Part name (Q'ty) Part name (Q'ty) Part name (Q'ty) Mounting screw ∅ 4 x 25 x 8 Installation plate x 1 Remote control holder x 1 Pan head wood screw ∅...
  • Page 48 FILE NO. SVM-05016 8-4-2. Cutting a hole and mounting installation 8-4. Indoor Unit plate 8-4-1. Installation place <Cutting a hole> • A place which provides the spaces around the When installing the refrigerant pipes from the rear. indoor unit as shown in the above diagram. •...
  • Page 49 FILE NO. SVM-05016 <When the installation plate is directly mounted on 8-4-3. Electrical work the wall> 1. The supply voltage must be the same as the rated 1. Securely fit the installation plate onto the wall by voltage of the air conditioner. screwing it in the upper and lower parts to hook up 2.
  • Page 50 FILE NO. SVM-05016 8-4-4. Wiring connection CAUTION • Be sure to refer to the wiring system diagram Air Inlet grille labeled inside the front panel. • Check local electrical cords and also any specific wiring instructions or limitations. Front panel Connecting cable Fig.
  • Page 51 FILE NO. SVM-05016 8-4-5. Piping and Drain Hose Installation To connect the pipe after installation of the unit (figure) <In case of rightward piping> (To the forefront of flare) • After scribing slits of the body-right by a knife or a 400 mm Liquid side making-off pin, cut them by a pair of nippers or the...
  • Page 52 FILE NO. SVM-05016 8-4-6. Indoor unit fixing 8-4-7. Drainage 1. Pass the pipe through the hole in the wall, and hook 1. Run the drain hose sloped downwards. the indoor unit on the installation plate at the upper hooks. NOTE •...

  • Page 53: Outdoor Unit

    FILE NO. SVM-05016 8-5-2. Refrigerant piping connection 8-5. Outdoor Unit 1. Cut the pipe with a pipe cutter. 8-5-1. Installation place • A place which provides the spaces around the outdoor unit as shown in the left diagram. Roughness Warp Obliquity 90°...
  • Page 54 FILE NO. SVM-05016 (Unit : N·m) 8-5-3. Evacuating Outer dia. After the piping has been connected to the indoor unit, Tightening torque of copper pipe you can perform the air purge together at once. ∅6.35 mm 16 to 18 (1.6 to 1.8 kgf·m) AIR PURGE ∅12.70 mm 50 to 62 (5.0 to 6.2 kgf·m)
  • Page 55 FILE NO. SVM-05016 <Stripping length of connecting cable> TO CHARGE REFRIGERANT RAS-24NKHD-E4 / RAS-24UAH-E4 RAS-18NKHD-E4 / RAS-18UAH-E4 Terminal block RAS-24NKD-E4 / RAS-24UA-E4 RAS-18NKD-E4 / RAS-18UA-E4 RAS-24NKDX4 / RAS-24UAX4 RAS-18NKDX4 / RAS-18UAX4 Refri gerant RAS-24NKD-AR4 / RAS-24UA-AR4 RAS-18NKD-AR4 / RAS-18UA-AR4 RAS-18NKDX4-T2 / RAS-18UAX4-T2...
  • Page 56 FILE NO. SVM-05016 2. Set the remote control selector switch with the 8-6. How to Set Remote Control Selector remote control Switch When two indoor units as installed in seperated rooms, [B] is indicated on the liquid crystal display when there is no need to change the selector switch.
  • Page 57 FILE NO. SVM-05016 8-7-3. Auto restart setting 8-7. Others This product is designed so that, after a power failure, 8-7-1. Gas leak test it can restart automatically in the same operating mode Electric parts cover as before the power failure. Information Flare nut connections The product was shipped with Auto Restart function...

  • Page 58: Troubleshooting Chart

    FILE NO. SVM-05016 9. TROUBLESHOOTING CHART 9-1. Troubleshooting Procedure : 9-2-2. Incorrect cable connection between Indoor and outdoor units Follow the details of 9-2. Basic Check Items. The indoor unit is connected to the outdoor unit with If there is no trouble corresponding to 9-2, check 4 cables.

  • Page 59: Primary Judgement

    FILE NO. SVM-05016 9-3. Primary Judgement 9-3-2. Failure diagnosis The indoor unit diagnoses the operation condition and 9-3-1. Role of indoor unit controller indicates the information of the self-diagnosis with the The indoor unit controller receives the operation lamps on the display panel of the indoor unit. commands from the remote control and executes them.
  • Page 60 FILE NO. SVM-05016 9-4. Self-Diagnosis by Remote Control (Check Code) (1) If the lamps are indicated as shown B to G in Table 9-3-1, exchanger the self-diagnosis by the remote control. (2) When the remote control is set to the service mode, the indoor controller diagnoses the operation condition and indicate the information of the self-diagnosis on the display of the remote...
  • Page 61 FILE NO. SVM-05016 Table 9-4-1 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 62: How To Diagnose Faulty Parts

    FILE NO. SVM-05016 9-5. How To Diagnose Faulty Parts Operation Check item Conceivable principle cause [04 Serial signal error] (Heat pump model) Measure Item by symptoms Does outdoor unit operate? Connect crossover Are 1, 2 and 3 crossover wires properly. wires connected properly? Is connector Connect connector...
  • Page 63 FILE NO. SVM-05016 [09 Other cycle error] (1) (Heat pump model) Does compressor operate? Does inner Check charged amount of refrigerant. Is compressor overload relay Check defective overload. turned off shortly? (in compressor) Check compressor. operate? Failure Replace Is TC sensor resistance value compressor.
  • Page 64 FILE NO. SVM-05016 [0C Indoor TA sensor error] Is CN03 (TA sensor connector) Connect CN03 properly. connected properly? Is TA sensor resistance value Replace TA sensor. (10 kΩ at 25°C) normal? Indoor P.C. board is defective. Replace P.C. board. [0d Indoor TC sensor error] Is CN01 (TC sensor connector) Connect CN01 properly.
  • Page 65 FILE NO. SVM-05016 [19 outdoor TD sensor error] (Heat pump model) Connect connector Is TD sensor connected properly? properly. Is TD sensor resistance value Replace TD sensor. (50 kΩ at 25°C) normal? Outdoor P.C. board is defective. Replace P.C. board. [1E Discharge temp.

  • Page 66: Troubleshooting For Indoor Unit

    FILE NO. SVM-05016 9-6. Troubleshooting for Indoor unit Operation 9-6-1. Power can not be turned on. (The unit does not operate at all.) Check item <Primar check> Conceivable principle (1) Is the supply voltage normal? cause (2) Is the connection to the AC output OK? (3) Is the fuse (F01) blown? Measure Item by symptoms...
  • Page 67 FILE NO. SVM-05016 9-6-2. Only the indoor fan does not operate <Primary chec k> (1) Is it possible to detect the power supply voltage (200 − 240V) between 1 and 2 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 5 minutes after it is turned on, to prevent a cold air from blowing in.) Shut off the...
  • Page 68 FILE NO. SVM-05016 9-6-3. Compressor does not operate. <Primary check> (1) Is the preset temperature higher than the room temperature in cooling operation? (2) Is the crossover cable connected properly? <Inspection procedure> Turn on power supply. Refer to 9-6-1 “Power Does OPERATION can not be turned on”.
  • Page 69 FILE NO. SVM-05016 <Inspection procedure> - Cooling model - Turn on power supply. Refer to item Power Does OPERATION can not be turned on . lamp blink? Refer to 9-9 Troubleshooting Is it possible to start for Remote Control . unit by remote control? Is it possible to detect AC 200V Replace P.C.
  • Page 70 FILE NO. SVM-05016 <Inspection procedure) - Heating model - AC 70-100V Replace transformer outdoor P.C. board. − 69 −...
  • Page 71 FILE NO. SVM-05016 Rewire or replace Are all of compressor cords normal? defective cords. Is compressor motor winding normal? Replace compressor. Compressor is defective. (Check winding resistor.) Is capacitor for compressor normal? Replace capacitor. Capacitor is defective. Replace overload relay. Is overload relay normal? Overload relay is defective.

  • Page 72: Troubleshooting For Wiring (Interconnect Cable And Serial Signal Wire)

    FILE NO. SVM-05016 9-7. Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire) 9-7-1. Outdoor unit does not operate. <Inspection procedure> (1) Is the voltage between of the indoor terminal block varied? (2) Are signals from the indoor unit to the outdoor unit transmitted correctly based upon the following diagram? NOTE: Measure the voltage for 2 minutes and 30 seconds after starting the unit.

  • Page 73: Troubleshooting For Air Purifier And Minus Ion

    FILE NO. SVM-05016 9-8. Troubleshooting for Air Purifier and Minus Ion 9-8-1. How to Check Whether the Air Purifier is Good or Not Turn off the power breaker once, and turn on again after 10 seconds. Does the OPERATION lamp blink? To item Power supply is not turned on Turn off the power breaker and remove CN34 (Micro switch connector).
  • Page 74 FILE NO. SVM-05016 9-8-2. How to Check Whether the Minus Ion Generator is Good or Not Turn off the power breaker once, and turn on again after 10 seconds. Does the OPERATION lamp blink? To item Power supply is not turned on Turn off the power breaker and remove CN34 (Micro switch connector).

  • Page 75: Troubleshooting For P.c. Board

    FILE NO. SVM-05016 <Inspection procedure> 9-9. Troubleshooting for P.C. board (1) If the P.C. board is detective, check for disconnec- 9-9-1. How to check indoor P.C. board tion, burn or discoloration of the copper foil pattern of the P.C. board. <Cautions for handling P.C.
  • Page 76 FILE NO. SVM-05016 Procedure Check points Causes 1. The temperature of the indoor 1. Check whether or not the Press [ ] button once heat exchanger is extremely low. compressor operates. to start the unit. • Shorten the time of the restart 2.

  • Page 77: Troubleshooting For Remote Control

    FILE NO. SVM-05016 9-10. Troubleshooting for Remote Control The unit does not beep at all. Press [ OPERATION lamp on button. indoor unit is not indicated. Is transmission mark indicated? Press RESET button on remote control Is receiver on with tip of pencil. indoor unit exposed to direct sunlight? Does indoor unit...

  • Page 78: Part Replacement

    FILE NO. SVM-05016 10. PART REPLACEMENT 10-1. Indoor Unit Part name Procedures Remarks Front panel How to remove the front panel 1) Stop the operation of the air conditioner and turn off its main power supply. 2) Pull the inlet grille toward you to open it and remove the inlet grille.
  • Page 79 FILE NO. SVM-05016 Part name Procedures Remarks Horizontal grille 1) Remove center 2 shafts of the horizontal grille from (1) Center shafts the back body. 2) Remove left shaft of the horizontal grille from the back body. (2) Left shafts 3) Remove the horizontal grille from the back body.

  • Page 80: Outdoor Unit (Ras-24Uah-E4, Ras-24Ua-E4, Ras-24Uax4, Ras-24Ua-Ar)

    FILE NO. SVM-05016 10-2. Outdoor Unit (RAS-24UAH-E4, RAS-24UA-E4, RAS-24UAX4, RAS-24UA-AR4, RAS-24UAX3-T1, RAS-18UAX4-T2) Part name Procedures Remarks Common 1) Stop the operation of the air conditioner and turn off Top cabinet procedure its main power supply or remove the power supply Electrical cord.
  • Page 81 FILE NO. SVM-05016 10-3 Outdoor Unit (RAS-18UAH-E4) Part name Procedures Remarks Common 1) Stop the operation of the air conditioner and turn off procedure its main power supply or remove the power supply cord. 2) Remove the electrical parts cover. (4 screws ∅...
  • Page 82 FILE NO. SVM-05016 10-4 Outdoor Unit (RAS-18UA-E4, RAS-18UAX4, RAS-18UA-AR4) Part name Procedures Remarks Common 1) Stop the operation of the air conditioner and turn off procedure its main power supply or remove the power supply Electric cord. parts cover 2) Remove the packed valved cover and the electrical (3 screws ∅...

  • Page 83: Exploded Views And Parts List

    PC BOARD ASSY; WRS-LED MCC-819 43T69456 PC BOARD (FOR RAS-18NKHD-E4 43T69457 PC BOARD (FOR RAS-18NKD-E4, 43T62003 CORD CLAMP RAS-18NKD-AR4, RAS-18NKDX4 43T62003 CLAMP, CORD 43T69458 43T60355 POWER CORD PC BOARD (FOR RAS-18NKDX4-T2) 43T51305 MICRO SWITCH 43T69454 PC BOARD (FOR RAS-24NKHD-E4 − 82 −...
  • Page 84 FILE NO. SVM-05016 11-2. Indoor Unit Electric Parts Assembly Location Location Part Description Description 43T00412 ront P anel, ASSY 43T03318 Back Body ASSY (RAS-24,18NKDX4, 43T09353 ille ASSY RAS-24NKDX4-T, RAS-18NKDX4-T2, 80306 Air Filter (L) RAS-24,18NKHD-E4, RAS-24,18NKD-E4) 43T80313 Air Filter (R) 43T07022 Holder, Pipe 43T03010 Body...
  • Page 85 FILE NO. SVM-05016 11-3. Outdoor Unit (RAS-24UAH-E4) Location Part Location Part Description Description 43T00024 Panel, Air Outlet 43T49309 Rubber-Cushion 43T00025 Panel, Front 43T21315 Motor, Fan, AC 220− 240 V 50 Hz 43T00026 Panel, Side 43T20301 Fan, Propeller, 491 43T42307 Base Assembly 43T96001 Bushing 43T19320 Guard, Fin 43T96004 Bushing, Cord...
  • Page 86 FILE NO. SVM-05016 11-4. Outdoor Unit (RAS-18UAH-E4) Location Part Location Part Description Description 43T55324 Capacitor, Plastic-film 43005144 Cabinet, Front 43T60324 Terminal Block, 6P 43T00005 Cabinet, Back 43T41341 Compressor, 2JS350D5DA02 43T00004 Cabinet, Side 43T52302 Magnetic Contactor, 43T42306 Base 43T00011 Plate, Packed, Valve AC220-240V 50Hz 43T46319 Valve, 4way 43T19314 Guard, Fan...
  • Page 87 FILE NO. SVM-05016 11-5. Outdoor Unit (RAS-24UA-E4, RAS-24UAX4, RAS-24UAX3-T1) Location Part Location Part Description Description 43T00024 Panel, Air Outlet 43T62014 Protector, Cord 43T00025 Panel, Front 43T62015 Protector, Cord 43T00026 Panel, Side 43T49316 Rubber Cushion 43T42316 Base Assembly Motor, Fan, AC 220 − 240 V 50Hz 43T21314 43T19320 Guard, Fin 43T20301...
  • Page 88 FILE NO. SVM-05016 11-6. Outdoor Unit (RAS-24UA-AR4) Location Part Location Part Description Description 43T00024 Panel, Air Outlet 43T62015 Protector, Cord 43T00025 Panel, Front Rubber Cushion 43T49316 43T00026 Panel, Side 43T21316 Motor, Fan, AC220-240 V 50 Hz 43T42316 Base Assembly 43T20301 F an, Propeller, 491 43T19320 Guard, Fin 43T96001...
  • Page 89 FILE NO. SVM-05016 11-7. Outdoor Unit (RAS-18UAX4-T2) Location Part Location Part Description Description 43T00024 Panel, Air Outlet 43T62014 Protector, Cord 43T00025 Panel, Front 43T62015 Protector, Cord 43T00026 Panel, Side Rubber Cushion 43T49008 43T42316 Base Assembly 43T21314 Motor, Fan, AC220-240 V 50 Hz 43T19320 Guard, Fin 43T20301 F an, Propeller, 491...

  • Page 90: Outdoor Unit (Ras-18Ua-E4, Ras-18Uax)

    FILE NO. SVM-05016 11-8. Outdoor Unit (RAS-18UA-E4, RAS-18UAX4) Location Part Location Part Description Description 43T00368 Cabinet, Front Assembly 43T63303 Fixing, Plate, Valve 43T47013 Capillary, Tube, 2.0 Dia. 43T03308 Cabinet, Side Assembly 43T41371 Compressor, PH340X3C-4KT1 43T42317 Base, Coat Assembly 43T47324 Bolt,Compressor, M6 43T09318 Guard, Fan 43T49008 Rubber Cushion 43T62311 Cover, E-Parts...
  • Page 91 FILE NO. SVM-05016 11-9. Outdoor Unit (RAS-18UA-AR4) Location Part Location Part Description Description 43T63303 43T00368 Cabinet, Front Fixing, Plate, Valve 43T47013 Capillary Tube, 2.0 Dia. 43T03308 Cabinet, Side 43T41372 Compressor, PH340X3C-4KTS1 43T42317 Base, Coat Assembly 43T09318 Guard, Fan 43T47324 Bolt, Compressor (M6) 43T62311 Cover, E-Parts 43T49008 Rubber Cushion 43T20307 Fan, Propeller...
  • Page 92 FILE NO. SVM-03010(1) TOSHIBA CARRIER (THAILAND) CO.,LTD. 144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI, AMPHUR MUANG, PATHUMTHANI 12000, THAILAND. – 87 –...

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