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Daewoo DSB-181LH, Service Manual

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53

Service Manual

SPLIT SYSTEM AIR CONDITIONER

Model: DSB-181LH

DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEFT.

S/M No

. 

:

 

DSB181L

010

✔ 

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).

Summary of Contents for DSB-181LH

Page 1: ...D OVERSEAS SERVICE DEFT S M No DSB181L010 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 ...

Page 2: ...iagram 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 Contents ...

Page 3: ...Type Rotary Model 2JS350D6BA02 Capacitor 35µF 370V AC Indoor Unit Outdoor Unit Type Cross flow fan Propeller fan Capacitor 1 2µF 450V AC 3µF 370V AC Motor Model Number IC 9425 DWKC 5A AM 12DPD04 Control Capillary Charge Q ty g 1320 Type Flare OD Liquid Suction in mm 1 4 6 35 1 2 12 7 Dimensions W x H x D mm 1 035 x 322 x 205 800 x 615 x 277 Net Weight kg 12 1 51 9 Electrical Data Compressor Fan Re...

Page 4: ...3 1035 205 322 453 áÆÄ ÇÁ º Á ÆÇ Ç é 2 OUTLINE AND DIMENSIONS 1 INDOOR UNIT DSB 181LH Connecting Pipe Filter L Filter R Grille Insert Body Plate Mounting REMOCON 453 1035 ...

Page 5: ...4 277 367 615 800 2 OUTDOOR UNIT DSB 181LH Inlet Inlet Outlet Foot Handle Panel Top Cabinet Service Valve Discharge Grille ...

Page 6: ... from the air Option Filter Emergency Remote Switch Slide to select the desired position Indicators Indicate the AC setting Remote Sensor Power Plug Air Cleaning Filters Removes dust and prohibits germs AIR OUT Air In Sensor Wire Fan Direction Up Down Fan Direction Left Right ON OF F EN TE R CA NC EL TIM ER RE SE T FA N DIR FA N SP EE D MO DE SL EE P ON OFF TE MP LCD Remote Controller ...

Page 7: ...the time of operating open the Front Panel Emergency switch can be used when the remote controller is lost or Testing Remote switch is usually used by remote controller Indoor Unit Display Switch Panel ON Red Lights when the operation is going on Air clean Green Timer Yellow Lights during the time reservation mode Quick Red Lights during the time Quick Mode Timer Quick Airclean ON EMERGENCY REMOTE...

Page 8: ...to access the AC connection from this unit to the indoor unit Connection Wire Drain Hose COPPER TUBING Service Valves The indoor and outdoor units are connected by copper tubes which are connected here Grounding Screw Ground the unit here Ground Wire Not supplied ...

Page 9: ...10 12 16 20 24hr MODE Button Press to cycle through the modes Auto Quick Cooling Fan Dry SLEEP Button Press to set the unit for the sleep mode FAN DIR Button Press to select up down direction for fan FAN DIR Button Press to select left right direction for fan ON OFF Button Press to turn the unit on or off TEMPERATURE Buttons Press to raise or lower the desired temperature FAN SPEED Button Press to...

Page 10: ...cators Auto Quick Cool Fan Dehumidifier Heat Lights to indicate the mode selected TIMER Indicators Include sleep Lights to indicate the timer function mode TEMPERATURE RESERVATION TIME lndicators Lights to indicate the temperature or time FAN DIRECTION Indicators Lights to indicate the fan direction NATURAL Indicator Lights to indicate the speeds simulating a loreeze FAN Indicators Lights to indic...

Page 11: ...ating Fan Indoor Outdoor and Compressor is running regardless of room temperature If the Indoor Unit Display receive the signal of Remote Controller you can hear the signal beep or beep beep OFF Timer 4 DESCRIPTION OF FUNCTIONS Unit ON Unit OFF SET Time HOUR ON OFF ON Timer Unit ON Unit OFF SET Time HOUR ON OFF Control of Room Temperature Buzzer COMP ON RT ROOM TEMPERATURE DT DESIRED TEMPERATURE C...

Page 12: ... relation 4 Automatic Operation If the unit is set in AUTO mode the unit operates automatically according to the room temperature to keep the room temperature comfortable FAN ONLY COOL DEHUMI AUTO QUICK HEAT DIFICATION H H H X H X H M M M X M X M L L L X L X L Auto X Auto Auto Auto X Auto Natural Natural Natural X Natural X Natural 0 L M H 1 C 2 C RT DT L M H 0 1 2 DT RT COOLING HEATING ...

Page 13: ...indicator will disappear in the display Sleep Mode 1 When the remote controller is lost damaged or the battery is discharged the Emergency operation can be used to run the unit 2 The setting conditions of Emergency operation are as follows Operation mode AUTO Preset temperature 26 C Discharge Air Direction SWING up and down Left and Right Fan speed AUTO Emergency Operation 0 0 5 1 0 HOUR COOLING C...

Page 14: ...ppear 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 The control procedure for indoor coil freeze protection 1 The compressor and outdoor fan turn off 2 Indoor fan operates according to user set speed 3 The normal ope...

Page 15: ...ature meets desired temperature and the compressor stops running over 30 minutes then the unit selects operating Mode again 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 ROOM TEMPERATURE 28 C RT 22 C RT 28 C RT 22 C OPERATING MODE Cooling Dehumidifier Heating FLAP POSITION Cooling Position Cooling Position ...

Page 16: ...e unit the flaps move the the position of keeping the room temperature comfortable 2 The air discharge direction procedure is below UP DOWN ON OFF LEFT RIGHT ON OFF 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 Room tem...

Page 17: ... Remote controller received the signal but the unit don t operate After resetting the function of HEATING AIRFLOW PREVENTION the unit operate by receiving the signal Defrost Airflow Prevention In HEAT mode the defrost is performed in the following conditions When the outdoor coil temperature is less than or equal to 5 C The compressor run time is greater than 50 minutes 2 Heating Condition Room Te...

Page 18: ... 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 1 Room air thermistor connector Indoor coi l thermister connector 2 Compressor Electrical parts of comp Gas leak 8 seconds 0 5 second 8 seconds 0 5 second ...

Page 19: ...18 4 WIRING DIAGRAM DSB 181LH INDOOR UNIT OUTDOOR UNIT ...

Page 20: ... 1 Transformer 3100007610 DWA 220V 50Hz 1 Stepping Motor 1 3108004310 MP28GA L 1300mm 1 Stepping Motor 2 3108004300 MP28GA L 400mm 2 Terminal Block 3108912330 SN DBW 6P 1 Compressor 3107130000 2JS350D6BA02 1 Duol Capacitor 3109500200 370V 35 3µF 1 Fan Motor 3108000400 AM12DPD04 1 Power Relay 5SC0202700 G7L 2A TUB 1 Terminal Block 3108912330 DBW 6P 1 Reversing Valve 3105400300 V2 100 1 Solenoid Coi...

Page 21: ...ANT CYCLE Note If the pipe length exceeds the standard length add 30g of refrigerant per extra meter Contents Model Name DSB 181LH Capillary tube ID2 0Ø x OD3 0Ø x L700 ID1 78Ø x OD3 0Ø x L800 Charge Quantity 1320g ...

Page 22: ...m air temp Indoor coil temp Outdoor coil temp Timer lamp Air clean lamp Remote Emergency Operation Signal receiver Quick lamp A D converter lnitialization Clock generation DC power supply Circuit for relay driving Circuit for TRIAC control Transformer Circuit for signal receiver MICRO CONTROLLER Beeper Circuit for motor driving Stepping motor 1 2 Temp Setting ON OFF SLEEP Turbo MILD AC220V 50Hz DC...

Page 23: ...t Fan Motor SWING MOTOR SWING MOTOR2 ROOM AIR SENSOR INDOOR COIL SENSOR SWING MOTOR1 Display Part Control Part Signal Receiver Pemote Controller COMP FMC OUTDOOR COIL SENSOR L N Y TERMINAL BLOCK 1 2 4W 7 ELECTRIC CIRCUIT DIAGRAM DSB 181LH 1 ELECTRIC CIRCUIT DIAGRAM ...

Page 24: ...lection 2 If the power ON OFF button is pressed once more the relay and triac are turn off and the unit stops operation 3 The unit turns on or off according to the temperature set point by sensing the room air temperature through thermistor 4 If the fan speed selection is set to the auto position the fan speed is automatically controlled according to the temperature differance between room tempera...

Page 25: ...2 PCB CIRCUIT DIAGRAM ...

Page 26: ......

Page 27: ...ck press the power ON OFF button on remote controller Does the beeper beep two times Is the display all off Check the connector on display PCB connected to control PCB Check the display PCB itself Check power supply mains or interconnection wires Check the wiring of indoor Is the switch position on switch pannel at Remote Does control PCB status LED repeat one second on and off control PCB fault M...

Page 28: ...s time guard for compressor operated Note 2 Please refer to page 25 Self Diagnostic function 1 Error Code 1 Check the connector of room air thermistor or connecting wire Check soldering of connecting on control P C B Error of soldering or short Check the resistance of room air thermistor 2 Error Code 3 Display Emergency Mode When the compressor do not run i Check the voltage between and of termina...

Page 29: ...ion Control P C B defect Check the indoor unit display is the display all off Press the ON OFF switch of Remote Control Is the indoor unit display all off Pull out the power plug and then insert the power plug after 5 second Control P C B is normal Recheck from the beginning Rating voltage more than 90 Rating voltage under 90 No No No Yes Yes Neither Indoor Unit nor Outdoor Unit Runs ...

Page 30: ...e of Indoor unit fan motor Check the fan motor capacitor Check the connecting wire of indoor fan motor Run again Check the Fan Motor bearing and fan Check the power P C B The circuit for triac control Change of fan motor NO Rating voltage under 90 Open or short YES Rating Voltage more than 90 Normal Outdoor Unit Runs but Indoor Unit Do Not Run ...

Page 31: ... between and of outdoor unit terminal N L Check the voltage between and of outdoor unit terminal 2 L Check outdoor fan motor individually Check the connecting wire Check the connecting wire Check the wiring and voltage within doors Rating voltage under 90 Rating voltage under 90 Rating voltage under 90 ...

Page 32: ...tdoor unit Check the compressor Check the winding resistance Check the compressor capacitor Check the connecting wire between indoor and outdoor Change the magnetic contactor Change the compressor Check the control P C B the circuit for relay driving Rating voltage less than 90 NG Open or Short Rating voltage less than 90 Rating voltage more than 90 Rating voltage more than 90 OK Only Compressor D...

Page 33: ...PCBDRIVINGDESCRIPTION ...

Page 34: ...ltage of secondary Power Transformer is rectified by Bridge Diode and it is filtering by Main Condensor CE1 Filtered DC voltage is about 18V is regulated 12V DC by Regulator IC7812 And it is regulated 5V DC by Regulator IC7805 VAR is serge filter and CC2 CC3 CE2 CE3 is Noise filter 7805 7812 CC3 104 CC2 CE2 CE3 CC1 CE1 1000µF 35V 104 DC5V GND DC12V 100µF 16V 470µF 25V AC 220V VAR C1 POWER TRANS ...

Page 35: ...erature 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 Relation between temperature and voltage is following Table 2 1 CC8 CC9 CC10 is Noise filter Room temperature and Evaporator temperature Sensor Input Table 2 1 Temperature Voltage V C No 23 24 25 5 1 12 0 1 37 15 2 22 25 2 79 40 3 52 ...

Page 36: ... 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 Selecting Mode 3 13 MICOM Emergency S W CN1 R15 1K CC6 POSITION OPERATING MODE Open REMOCON Close EMERGENCY Table 3 1 ...

Page 37: ...r Supply 4 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 42 22 21 MICOM C6 10µF 16V CE2 47µF 16V CC1 104 5V ...

Page 38: ...com 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 Reset 5 CE1 7042P 104 CC3 18 1K R9 R10 5 6K 1 3 2 4 7uF 16V RESET IC 5V MICOM 4 25V H L t t POWER ON Vcc 5V DELAY TIME FOR POWER ON RESET 4 2V ...

Page 39: ...s 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 R4 is Resistance to protect excessing current of Buzzer 34 6 11 R4 1K KID65004 12V MICOM Buzzer Driving 6 ...

Page 40: ... 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 Ref Fig 7 1 SN1 is Snubber MICOM 38 KID 65004 R4 1K 12V 1 2 TLP560J R5 100 L1 SN1 0 1µF 120 TRIAC SM3 JZ47 TO MOTOR L AC220V Triac Driving 7 AC220V TRIGGER MOTOR INPUT LOW SPEED MEDIUM SPEED HIGH SPEED Fig 7 1 ...

Page 41: ...39 Oscillation 8 X TAL 8MHz 50 49 VDD 10 VSS 10 Fig 9 1 DESCRIPTION Oscillatory Frequency drive Micom it is made up 8MHz X TAL oscillatory Freqency Ocillatory wave is as following Fig 9 1 ...

Page 42: ... MICOM 30 CA1 RA R14 R13 R12 R11 JS5 Test JS3 JS4 29 28 27 Selecting Function is as following Table Functional Configuration 9 JS6 JS5 JS4 JS3 SHORT Skip Mild Heat 50Hz OPEN Comp err detect High Cool 60Hz ...

Page 43: ...t the swing motor connection wire Loosen a screw for fixing ground wire Loosen two screws for fixing the body 4 Removing the Drain Pan After doing above procedures Loosen a screw for fixing body Fig 4 Unhook the right part of Drain Pan 5 Removing the Indoor Coil After doing above procedures Loosen four screws for fixing indoor coil at left and right side Fig 5 Loosen a screw for fixing the bracket...

Page 44: ...42 PROCEDURES PHOTOS 7 Removing the blower After doing above procedures Loosen a screw for fixing holder bearing Remove the blower Fig 8 Fig 7 ...

Page 45: ...y spanner Remove spring washer and plain washer Remove fan Remove fan stopper Disconnect Motor lead wire from control box Loosen four screws for fixing Motor bracket and then remove the Motor 3 Removing Dual Capacitor Do basic procedure Diconnect lead wire from the Deul capacitor Loosen two screws for fixing the capacitor bracket Remove the Deul capacitor 4 Removing Magnetic Contactor Fig 5 Do bas...

Page 46: ...44 3 EXPLODED DIAGRAM Indoor Unit DSB 181LH ...

Page 47: ...1 3108000311 MOTOR FCU 1 IC 9425 DWKC 5A 12 3102400900 INSERT GRILLE 1 ABS 13 3100501000 BOX CONTROL 1 ABS 14 3107400010 EVAPORATOR ASS Y 1 15 3101930000 FILTER ELECTRO ASS Y 1 16 3101940000 FILTER CARBON ASS Y 1 17 3101403700 COVER TERMINAL BLOCK 1 ABS 18 3108100100 PAN DRAIN 1 ABS 19 3102200200 FRAME 1 ABS 20 3101910000 FILTER PRE R ASS Y 1 Caution In this Service Manual some parts can be change...

Page 48: ... LED PCB ASS Y 1 27 3108000100 MOTOR STEPPING 2 MP28GA l 400mm 28 3108912330 TERMINAL BLOCK 1 DBW 6P 29 3107400300 EVA BRKT L 1 SECC T1 0 30 3107800200 LINK VER A 1 ABS 31 3107800400 LINK VER C 1 ABS 32 3107500200 EMBLEM 1 URETAN 33 3105500200 PLATE WINDOW SWITCH 1 34 3104500300 PLATE MOUNTING 1 SECC T0 8 35 3108000200 MOTOR STEPPING 1 MP28GA l 1300mm 36 3104300200 POWER PCB ASS Y 1 37 3104300400 ...

Page 49: ...47 4 EXPLODED DIAGRAM Outdoor Unit DSB 181LH 37 38 39 ...

Page 50: ...108000400 MOTOR ODU 1 220V 50Hz 11 3106800030 CONDENSER ASS Y 1 12 7392800011 NUT HEX 1 M8 13 3102600101 HANDLE R 1 PP 14 3104500601 PLATE PARTITION 1 SECC T1 0 15 310061000P BRACKET SERVICE ASS Y 1 16 3102100200 FOOT 4 SECC T2 0 17 3102600200 HANDLE L 1 PP 18 3101200310 CLAMP CORD 2 19 3101200100 CLAMP CAPACITOR 1 SECC T0 8 20 3100003200 PIPE REVERSING ASS Y 1 CU Caution In this Service Manual so...

Page 51: ...CE VALVE 1 27 3105400100 SERVICE VALVE 1 28 5SC0202700 POWER RELAY 1 G7L 2A TUB 29 3100003400 COIL SENSOR ASS Y 1 30 3102100700 FOOT CUSHION 4 NR 31 3106000900 COMP BOLT 3 M8 x L46 5 32 3101500700 RUBBER CUSHION 3 NR 33 7400208411 WASHER PLAIN 3 M8 34 7392800011 NUT HEX 3 M8 35 7347602011 BOLT HEX 4 M6 x L20 36 7348602011 BOLT HEX 4 M6 37 7112401214 SCREW TAPPING 10 M4 38 3109500900 CAPACITOR DUAL...

Page 52: ...50 5 CONTROL BOX ASSEMBLY DSB 181LH 1 CONTROL BOX ASSY ...

Page 53: ...RNESS REVER VALVE UL 1015 18 1 3102704420 14 HARNESS OD SIGNAL UL 1015 18 1 3102704430 15 POWER CORD WS 93 250V 10 16A 1 31013A24B1 16 CABLE CORD DA 5N 1 3101200300 17 CONTROL PCB ASS Y DSB 181LH HEAT PUMP 50Hz 1 3104300100 18 HARNESS CONNECTING UL 1007 26 1 3102704900 19 POWER PCB ASS Y DSB 181LH 1 3104300200 20 LED PCB ASS Y 15 18K FR 4 1 3104300300 21 SWITCH PCB ASS Y 15 18K FR 4 1 3104300400 2...

Page 54: ... 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 ...

Page 55: ......

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