Daewoo DSB-181LH User manual

53
Service Manual
SPLIT SYSTEM AIR CONDITIONER
Model: DSB-181LH
DAEWOO ELECTRONICS CO., LTD.
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).

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
Contents

2
1. SPECIFICATIONS
MODEL DSB-181LH
ITEM
Function COOLING HEATING
Class T
Power 220~240V/ 50Hz
Capacity W 5,110 5,400
Btu/h 17,500 18,500
Dehumidification l/h 2.2
Running Current A 10.8 11.5
Power Input W 2,050 2,230
Starting Current A
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
Refrigerant
(R-22)
Connection
◆DSB-181LH

3
1035
205
322
453
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2. OUTLINE AND DIMENSIONS
1
INDOOR UNIT
DSB-181LH
Connecting Pipe
Filter-L Filter-R
Grille Insert
Body
Plate Mounting
REMOCON
453
1035

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

5
1
PARTS OF NAME AND FUNCTION
Indoor Unit
3. OPERATION
◆DSB-181LH
Indoor Cover
Electrostatic Filter
Removes dust
particles from the air.
(Option Filter)
Deodorizing Filter
Removes bad
smells 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 OFF ENTER CANCEL
TIMER RESET
FAN DIR.
FAN SPEED
MODE
SLEEP
ON/OFF
TEMP.
LCD Remote Controller

6
●DSB-181LH
■ 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”.
■ There is a switch panel at inside of Front Panel.
At 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

7
Outdoor Unit
● DSB-181LH
AIR IN
AIR OUT
AC Cover
Remove cover 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)

8
Name of Each Button
2
REMOTE CONTROLLER
●DSB-181LH
MODE
SLEEP
ON/OFF
TIMER
ENTER/
CANCEL
FAN SPEED
TURBO/MILD
Display
Displays information
pertaining to unit.
TURBO/MILD
Press to be colder the unit.
TIMER ENTER/CANCEL Button
Press to enter a timer setting or
to cancel timer setting
TIMER ON/OFF Button
Press to set the unit of or on time.
(0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8,
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 select the fan speed
(High " ", Middle " ",
Low " ").
COVER
Slide down to access most
of the remote buttons.
Slide down further to
access the battery
compartment.
AUTO
FAN DIR.
FAN DIR.

9
Replacing Batteries
3
REMOTE CONTROLLER DISPLAY
Open the cover after
pressing the arrow
direction and pulling out.
Put the drycell by
direction. Close the cover after pushing into arrow
direction.
123
+–
+–
● DSB-181LH
MODE Indicators (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 indicate
the fan speed.
AUTO
+–

10
If you set time in OFF-Timer Mode, the unit will stop at the set time.
If you set time in ON-Timer Mode, the unit will run at the set time.
(1) Range of setting temperature: 18~32°C
(2) Setting temperature: Operating temperature of compressor
(3) During the time of test operating, 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
COMP (OFF)
-1°C 0°C
(COOLING)
(RT-DT)
COMP (ON)
COMP (OFF)
-1°C 0°C
(HEATING)
(DT-RT)

11
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)
(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
HH H X H X H
MM M X M X M
LL L X L X L
Auto X Auto Auto Auto X Auto
Natural Natural Natural X Natural X Natural
0
LMH
+1°C +2°C (RT-DT)
LMH
0 1 2 (DT-RT)
(COOLING)
(HEATING)

12
(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.
(3) To cancel sleep mode, press the SLEEP button again or press the MODE button once.: the SLEEP
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 CYCLE)
DT
+0.5°C+0.5°C+0.5°C
0 0.5 1.0 HOUR
(HEATING CYCLE)
DT
–0.5°C
–0.5°C
–0.5°C

13
3 min. Time Delay of Compressor
In normal operation, there is a time delay of three minutes between turn off and turning back on including initial
power up.
When indoor fan motor is on, it always starts at normal speed and then it operates desired speed.
Indoor Fan Motor Starting
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. 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 operation returns when the indoor coil temperature is higher than 7°C or equal to 7°C.
0°C 7°C
Compressor and
Outdoor Fan OFF
OFF
ON
Set Speed
Indoor Fan
(Indoor coil temperature)

14
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
(2) Selecting Operating Mode Again
Room temperature 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
Heating Position
(RT: Room temperature)

15
(1) Cooling Condition (Room Temperature > 22°C)
!Fan Speed: Super high speed
@Air discharge direction: Fixed
#Set temperature: 18°C (Fixed)
$Operation Mode: Cooling Mode
%Compressor and Outdoor Fan
Dehumidification Mode
Air Discharge Direction
Auto Mode II(Powerful Cooling)
-1
OFF
ON
(Room temperature-18˚C)
0 1
(1) When you turn on the 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 temperature 18°C
Compressor : OFF
Indoor Fan : 1 min/ON, 7 min/OFF
Fan speed : Ultra low speed
COOLING POSITION
HEATING POSITION
<
>

16
Cooling Airflow Prevention
When the indoor coil temperature is lower than 30°C, Microcomputer of the unit stops indoor fan to prevent cooling
airflow.
Heating Airflow Prevention
When the indoor coil temperature is higher than 65°C, Microcomputer of the unit stops the compressor to prevent it
from overheating. In the funcfion of HEATING AIRFLOW PREVENTION, when pressing FAN SPEED button,
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 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
-1
OFF
ON
(Room temperature-32˚C)
0 1
<

17
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
1 Room air thermistor, connector
Indoor coi l thermister, connector
2Compressor, Electrical parts of
comp. Gas leak
8 seconds
0.5 second
8 seconds
0.5 second

18
4. WIRING DIAGRAM
◆ DSB-181LH
INDOOR UNIT
OUTDOOR UNIT

19
◆ DSB-181LH
Indoor
Unit
Outdoor
Unit
1
MAIN ELECTRIC PARTS
PART NAME PART CODE SPEC. QUANTITY REMARK
Fan Motor 3108000311 IC-9425 DWKC 5A 1
Fan Motor Capacitor 3106995010 1.2µF 450VAC 0.2A 1
Fuse 5FVLB3152L 250V/50T 3.15A 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 Coil 3109700100 L30-0240 1