Daewoo DSB-181LH Service Manual
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Daewoo DSB-181LH Service Manual

Daewoo DSB-181LH Service Manual

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Service Manual

SPLIT SYSTEM AIR CONDITIONER
Model: DSB-181LH
Caution

: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEFT.
53
S/M No. : DSB181L010

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Summary of Contents for Daewoo DSB-181LH

  • Page 1: Service Manual

    : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). DAEWOO ELECTRONICS CO., LTD. OVERSEAS SERVICE DEFT.

  • Page 2: Table Of Contents

    Contents CONTENTS 1. Specifications ....................2 2. Outline and Dimensions .................3 3. Operation .....................5 4. Wiring Diagram..................18 5. Refrigerant Cycle ..................20 6. Control Block Diagram.................21 7. Electric Circuit Diagram................22 8. Trouble Shooting..................25 9. Disassembly Instructions ................41 1) Indoor Unit....................41 2) Outdoor Unit...................43 3) Exploded Diagram (Indoor Unit) ...............44 4) Exploded Diagram (Outdoor Unit) ............47 5) Control Box Assembly ................50...

  • Page 3: Specifications

    1. SPECIFICATIONS DSB-181LH MODEL DSB-181LH ITEM Function COOLING HEATING Class Power 220~240V/ 50Hz Capacity 5,110 5,400 Btu/h 17,500 18,500 Dehumidification Running Current 10.8 11.5 Electrical Power Input 2,050 2,230 Data Starting Current Type Rotary Compressor Model 2JS350D6BA02 Capacitor 35µF/370V AC...

  • Page 4: Outline And Dimensions

    2. OUTLINE AND DIMENSIONS INDOOR UNIT DSB-181LH...
  • Page 5 OUTDOOR UNIT DSB-181LH...

  • Page 6: Operation

    3. OPERATION PARTS OF NAME AND FUNCTION DSB-181LH Indoor Unit Deodorizing Filter Removes bad smells from the air. (Option Filter) Electrostatic Filter Emergency/ Removes dust Remote Switch Air In particles from the air. Slide to select (Option Filter) the desired position.
  • Page 7 DSB-181LH Indoor Unit Display Switch Panel Remote Control Signal Receiver This place is the part to receive the signal if it receive the signal, you can hear the signal “beep. beep”. EMERGENCY REMOTE Timer Quick Airclean There is a switch panel at inside of Front Panel.
  • Page 8 DSB-181LH Outdoor Unit AC Cover Remove cover to access the AC connection from AIR IN this unit to the indoor unit. Connection Wire Drain Hose COPPER TUBING AIR OUT Service Valves The indoor and outdoor units are connected by copper tubes which are connected here.

  • Page 9: Remote Controller

    REMOTE CONTROLLER DSB-181LH Name of Each Button Display AUTO Displays information pertaining to unit. ON/OFF Button Press to turn the unit on or off. TEMPERATURE Buttons Press to raise or lower FAN SPEED Button the desired temperature. Press to select the fan speed (High "...

  • Page 10: Remote Controller Display

    REMOTE CONTROLLER DISPLAY DSB-181LH MODE Indicators (Auto/Quick/Cool/Fan/Dehumidifier/Heat) Lights to indicate the mode selected. AUTO FAN Indicators FAN DIRECTION Indicators Lights to indicate Lights to indicate the the fan speed. fan direction. NATURAL Indicator Lights to indicate the speeds simulating a loreeze.
  • Page 11 DESCRIPTION OF FUNCTIONS OFF-Timer If you set time in OFF-Timer Mode, the unit will stop at the set time. Unit ON Unit OFF SET Time HOUR ON-Timer If you set time in ON-Timer Mode, the unit will run at the set time. Unit ON Unit OFF SET Time...
  • Page 12 Fan Speed (Indoor Unit) (1) Motor speed (high speed, normal speed, low speed). (2) Remote controller setting fan speed. (Auto, L, M, H, Natural) (3) Relation of operating mode between fan speed. (legned: X-no relation) DEHUMI- FAN ONLY COOL AUTO QUICK HEAT DIFICATION...

  • Page 13: Sleep Mode

    Sleep Mode (1) When you are going to sleep, select sleep switch and the unit controls the room to the desired temperature. (The unit will not operate after 4 hour) (2) For changing the temperature. +0.5°C +0.5°C –0.5°C +0.5°C –0.5°C –0.5°C HOUR HOUR...
  • Page 14 Frost Prevention of Indoor Unit When the unit operates at low ambient temperature, frost may appear on the Evaporator. When the indoor coil temperature is lower than 0°C at the end of 10 minutes of continuous compressor operation from the start, the microcomputer of the unit stops the compressor to protect the unit from the frost.

  • Page 15: Auto Mode

    5 Seconds Time Delay of Indoor Fan Motor Wnen the speed of indoor fan motor changes, there is a time delay of 5 seconds at each speed step. Auto Mode (1) In Auto Mode After the indoor fan is operated for 20 seconds in the Auto Mode, the unit will operate automatically by selecting operating Mode according to the room temperature (RT: Room temperature) ROOM TEMPERATURE...

  • Page 16: Dehumidification Mode

    Dehumidification Mode Desired temperature < Room temperature Outdoor Fan, Compressor : ON Indoor Fan : Low speed > Desired temperature Room temperature Compressor : 3 min/ON, 5 min/OFF Indoor Fan : 3 min 30 second/ON, 4 min 30 second/OFF Fan Speed : Ultra low speed <...
  • Page 17 < (2) Heating Condition (Room Temperature 22°C) Fan Speed: Super high speed Air discharge direction: Fixed Set temperature: 32°C (Fixed) Operation Mode: Heating Mode Compressor and Outdoor Fan (Room temperature-32˚C) Cooling Airflow Prevention When the indoor coil temperature is lower than 30°C, Microcomputer of the unit stops indoor fan to prevent cooling airflow.
  • Page 18 Self-Diagnostic Function The control will contain diagnostic test to verify the integrity of the system. (1) Error Code Display Pattern ON LAMP: ON (Red) LED ON/OFF Error Code (Display in Emergency Mode only) ERROR CODE DISPLAY PATTERN ERROR CONTENTS 8 seconds Room air thermistor, connector 0.5 second Indoor coi l thermister, connector...

  • Page 19: Wiring Diagram

    4. WIRING DIAGRAM DSB-181LH...
  • Page 20 MAIN ELECTRIC PARTS DSB-181LH PART NAME PART CODE SPEC. QUANTITY REMARK Fan Motor 3108000311 IC-9425 DWKC 5A Fan Motor Capacitor 3106995010 1.2µF 450VAC 0.2A Fuse 5FVLB3152L 250V/50T 3.15A Indoor Transformer 3100007610 DWA-220V/50Hz Unit Stepping Motor 1 3108004310 MP28GA (L=1300mm) Stepping Motor 2...

  • Page 21: Refrigerant Cycle

    5. REFRIGERANT CYCLE Note) If the pipe length exceeds the standard length, add 30g of refrigerant per extra meter. Model Name DSB-181LH Contents Capillary tube ID2.0Ø x OD3.0Ø x L700 ID1.78Ø x OD3.0Ø x L800 Charge Quantity 1320g...

  • Page 22: Control Block Diagram

    6. CONTROL BLOCK DIAGRAM DSB-181LH Operating Mode Unit on lamp Remote Signal receiver Fan Speed Timer lamp Emergency Timer Selection Air-clean lamp Flap Position Operation Quick lamp Temp. Setting ON/OFF SLEEP Room air temp. Turbo/MILD Indoor coil temp. Outdoor coil temp...

  • Page 23: Electric Circuit Diagram

    7. ELECTRIC CIRCUIT DIAGRAM ELECTRIC CIRCUIT DIAGRAM DSB-181LH Indoor Unit Fan Motor TERMINAL BLOCK I.D.C SWING MOTOR TRANS- SWING FORMER MOTOR2 SWING MOTOR1 POWER RELAY Display Part Control Part COMP COMP ROOM AIR SENSOR Signal Receiver Pemote Controller INDOOR COIL...
  • Page 24 Description 1. After the power ON/OFF button is pressed once, the relay and triac are turned ON or OFF per the remote control setpoint. – TRIAC is controlled per the fan speed selection. – RELAY is controlled per the operation mode selection. 2.
  • Page 25 PCB CIRCUIT DIAGRAM...

  • Page 27: Trouble Shooting

    8. TROUBLE SHOOTING...
  • Page 28 Note 1) ! Neither indoor unit nor outdoor unit runs. Check the following points first. (There are following case in normal operation) a. Is the timer mode set the "timer ON". b. Is the timer mode set the "timer-OFF" and the time had passed? @ Neither outdoor fan nor compressor runs while indoor fan runs.
  • Page 29 Neither Indoor Unit nor Outdoor Unit Runs The power is applied to the unit Rating voltage Check the Breaker or Fuse under 90% Check the voltage between of terminal block Rating voltage more than 90% Check the indoor unit display Self Diagnostic is the display all off? function is ON...
  • Page 30 Outdoor Unit Runs but Indoor Unit Do Not Run Check rotation of indoor fan Check the Fan Motor bearing and fan Rotate indoor fan by hand Check the power P.C.B. Rating voltage Check input Voltage of Fan Motor connector at power P .C.B under 90% The circuit for triac control Rating Voltage more than 90%...
  • Page 31 Outdoor Fan Do Not Run Check the wiring Rating voltage Check the voltage between and voltage of indoor unit terminal under 90% within doors Rating voltage Check the connecting wire Check the voltage between under 90% of outdoor unit terminal Rating voltage Check the Check the voltage between...
  • Page 32 Only Compressor Do not Run - Check the following at cooling mode Check the control P .C.B Rating voltage Check the voltage between the circuit for relay of indoor unit terminal less than 90% driving. Rating voltage more than 90% Check the connecting Rating voltage wire between indoor...
  • Page 33 PCB DRIVING DESCRIPTION...
  • Page 34 Power Supply (1) POWER TRANS AC 220V DC12V DC5V 7805 7812 1000µF/35V 100µF/16V 470µF/25V DESCRIPTION DC Power Supply in circuit needs +12V and +5V. +12V is used for Compressor Driving Relay, Triac Driving Photo Triac, Buzzer Driving Swing/Sweep Motor, and LED Display. AC voltage of secondary Power Transformer is rectified by Bridge Diode, and it is filtering by Main Condensor CE1.
  • Page 35 Sensor (2) Room temperature and Evaporator temperature Sensor Input R20 R22 12.7K x 3 ROOM R19 330 R21 330 R23 330 CC10 MICOM DESCRIPTION Number 23, 24, 25 of Micom is Terminal of A/D convertor Input. Room temperature and Indoor coil, Outdoor coil Temperature is sensing by change of Thermister Resistance, Micom is put in 5V by ratio between R18 (12.7KΩ) and R20, R22 (12.7KΩ).
  • Page 36 Selecting Mode (3) (SELECT S/W INPUT, OUTPUT) R15 1K Emergency S/W MICOM DESCRIPTION There are three Mode according to SW position as following Table 3-1. According as port of fixed Micom is Low, the unit is operating as following Table 3-1. POSITION OPERATING MODE Open...
  • Page 37 Micom Power Supply (4) MICOM 47µF/16V 10µF/16V DESCRIPTION MICOM Power is supplied 5V at Number 42 using Digital, Number 22 using Reference of A/D Converter. CE2 is Ripple filter and CC1 is Noise filter.
  • Page 38 Reset (5) 5.6K MICOM 7042P RESET IC 4.7uF/16V DESCRIPTION Voltage less than about 4.2V put in Micom Termina of Number 18 and then Micom reset. Reset IC detect Power ON and Voltage less than 4.2V, and then send Reset Signal. There is a Manual Reset S/W to reset manually if necessary.
  • Page 39 Buzzer Driving (6) MICOM KID65004 DESCRIPTION Micom 15 Terminal put out Buzzer Driving Pulse, its output is driving Buzzer through Buffer. Ocillatory Frequency of buzzer is selected by internal Micom. It is set by S/W among 2 KHz, 4.1KHz and 8.2KHz. This unit is setting at 4.1KHz.
  • Page 40 Triac Driving (7) R5 100 L AC220V TRIAC JZ47 KID 65004 MICOM TLP560J TO MOTOR 0.1µF+120 DESCRIPTION Number 38 Terminal of Micom is put out Pulse Output, by way of Buffer it is driving Photo Triac K3021PG and then Triac SM3JZ47 is supplied Trigger Signal. Trigger Test of Triac is detected Zero Cross Part of AC input and it is triggered from Zero Cross part to Time delay part according to Fan Speed.
  • Page 41 Oscillation (8) X-TAL 8MHz DESCRIPTION Oscillatory Frequency drive Micom, it is made up 8MHz X-TAL oscillatory Freqency. Ocillatory wave is as following Fig 9-1. -10% +10% Fig 9-1...
  • Page 42 Functional Configuration (9) Test MICOM Selecting Function is as following Table SHORT OPEN Skip Comp err detect Mild High Heat Cool 50Hz 60Hz...

  • Page 43: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS INDOOR UNIT ¡ DSB-181LH PROCEDURES PHOTOS 1. Stop the Air conditioner and disconnect the power cord from the wall outlet. 2. Removing the insert Grille and Frame. Fig 1 !Loosen three screws for fixing the the Insert Grille and Frame.
  • Page 44 PROCEDURES PHOTOS 7. Removing the blower. After doing above procedures: !Loosen a screw for fixing holder bearing. @ Remove the blower. Fig 7 Fig 8...

  • Page 45: Outdoor Unit

    OUTDOOR UNIT ¡ DSB-181LH PROCEDURES PHOTOS 1. Basic Procedures !Stop the air conditioner and pull out power plug from wall outlet. @ Remove CABINET TOP COVER. (Loosen ten screws) # Remove CABINET SIDE COVER. (Loosen six screws) $ Remove CABINET FRONT. (Loosen six screws) Fig 1 2.

  • Page 46: Exploded Diagram (Indoor Unit)

    EXPLODED DIAGRAM (Indoor Unit) ¡ DSB-181LH...
  • Page 47 ¡ DSB-181LH Parts List (Indoor Unit)  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)
  • Page 48 PART CODE PART NAME Q'TY SPEC REMARK 3101920000 FILTER PRE L ASS’Y 3102900500 HINGE R 3102900600 HINGE L 3104300100 CONTROL PCB ASS’Y 3107800100 LINK VER CAM P .O.M 3104300300 LED PCB ASS’Y 3108000100 MOTOR STEPPING MP28GA l=400mm 3108912330 TERMINAL BLOCK DBW-6P 3107400300 EVA BRKT L...

  • Page 49: Exploded Diagram (Outdoor Unit)

    EXPLODED DIAGRAM (Outdoor Unit) ¡ DSB-181LH...
  • Page 50 ¡ DSB-181LH Parts List (Outdoor Unit)  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)
  • Page 51 PART CODE PART NAME Q'TY SPEC REMARK 3105400300 REVERSING VALVE V2-100 3100003000 PIPE FILTER ASS’Y 3109700100 SOLENOID COIL L30-0240 3100003100 CAPILLARY ASS’Y ¤ß 3107130000 COMPRESSOR ASS’Y 220-240V 50Hz 3105400210 SERVICE VALVE ¤ø 3105400100 SERVICE VALVE ¤ 5SC0202700 POWER RELAY G7L-2A-TUB 3100003400 COIL SENSOR ASS’Y 3102100700...

  • Page 52: Control Box Assembly

    CONTROL BOX ASSEMBLY ¡ DSB-181LH 1 CONTROL BOX ASSY...
  • Page 53 ¡ DSB-181LH Parts List (Control Box Assembly)  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)
  • Page 54 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 360-8184 TEL: 02) 360-8182/8178~9 http://www.dwe. daewoo.co.kr PRINTED DATE: APR.1999...

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