Daewoo DWB-122CH User manual

1
TABLE OF CONTENTS
1. PRECAUTION...............................................................................2
2. GENERAL SPECIFICATIONS ................................................................3
3. NAMES OF MAJOR COMPONENTS .........................................................4
4. FUNCTION OF MAIN COMPONENTS ........................................................5
5. GENERAL INFORMATIONS .................................................................7
6. CARE AND MAINTENANCE .................................................................9
7. ELECTRICAL REQUIREMENTS ............................................................10
8. DESCRIPTION OF FUNCTIONS ............................................................11
9. WIRING DIAGRAM.........................................................................12
10. REFRIGERANT CYCLE ...................................................................13
11. PCB DRIVING DESCRIPTION .............................................................14
12. TROUBLE SHOOTING GUIDE.............................................................16
13. HOW TO DISASSEMBLE..................................................................19
14. EXPLODED DIAGRAM AND PARTS LIST ..................................................20

2
1. PRECAUTION
Please observe the following instructions.
1. Turn off unit.
Make sure the unit is OFF and the AC cord is unplugged before repairing or servicing.
2. In case of checking the circuit unavoidably while the unit is connected with power source, be careful
not to connect with the part of electric charge.
You may cause electric shock.
3. Use of proper part if you need to replace the part, be sure to use genuine part of servicing model.
Do not repair or replace the electric contact part.
Consumer must not repair the unit, because it is dangerous.
4. Use of proper tool.
You must use the proper tool to repair the unit, and use the measuring appliance adjusted accurately.
5. Damage of electric wire and power cord when servicing.
Check electric wire and a surely replace a damage electric wire and a damage power cord.
6. Never use connecting the middle of wire, after cutting the middle of wire.
It may cause a fire and trouble.
7. Checking the insulation resistance.
After you complete the assembly of unit, surely check the insulation resistance.
Confirm that the insulation resistance of the power line and the ground terminal is over 30MΩby measuring insulation
resistance.
8. Checking the ground.
After checking the ground, servicing it completely.
9. Checking the installation.
After checking the installation, servicing it completely.
10. Care children.
When servicing, do not make the children approach the air-conditioner.

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3.NAMES OF MAJOR COMPONENTS
12
NO PART NAME
1 AIR FILTER
2 GRILLE FRONT
3 CABINET
4 BLADE VERTICAL
5 KNOB THERMOSTAT
6 KNOB SELECTOR
NO PART NAME
7 BLADE HORIZONTAL
8 AIR VENT
9 AIR INTAKE
10 AIR DISCHARGE
11 HEATER LAMP
12 CABINET DRAIN (Attached inside of Grille Front)

5
4. FUNCTION OF MAIN COMPONENTS
• FAN & COOLING CONTROL
The Fan Control Selector Switch has six positions.
Choose one of the speed settings by rotating the fan control Selector Switch to the appropriate position
OFF Select this setting for stop all operation of air conditioner
FAN Select this setting for low speed air circulation without cooling and
heating.
LOW COOL Select this setting for cooling operation with LOW FAN.
HIGH COOL Select this setting for cooling operation with HIGH FAN.
LOW HEAT Select this setting for Heating operation with LOW FAN.
HIGH HEAT Select this setting for Heating operation with HIGH FAN.
• TEMPERATURE CONTROL
Choose a temperature settings by rotating the knob of thermostat to the appropriate position
• The Thermostat automatically starts and stops operation in order to keep the room
temperature at a proper level, and this results in efficient use of power and economical
cooling.
• Turn clockwise for a cooler room temperature.
• Turn counter-clockwise for a warmer room temperature.
• HEATER LAMP
When the unit sets heating operation condition, the red lamp is lighted.
When the frost settles on the heat exchanger of the outside, defrosting is made automatically and the red lamp is turned
off.
The unit may give a hiss and the fan motor stops for 1 to 10 minutes.
This should not be regarded as a problem.
After defrosting, the heating operation begins again.
NOTE
• ECONOMICAL AND COMFORTABLE USE
1. Properly control the room temperature.
2. Avoid being exposed to direct sunlight.
3. Prevent the wind from entering the room.
WARMER COOLER
HIGH
COOL
LOW
COOL
HIGH
HEAT
LOW
HEAT
FANFAN OFF
SELECTOR
WARMER COOLER
THERMOSTAT
CAUTION
When the air conditioner has been performing its cooling operation and is turned “OFF”or set to the ‘FAN”
position, wait at least 3 minutes before resetting to the cooling operation.

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•MOTOR
The motor is used to rotate the indoor and outdoor fan so that the room air can be recirculated.
•FAN MOTOR
–BLOWER FAN : The Blower draws hot air from the room through the Evaporator and then discharges it back into the
cool air. It circulates the room air.
–PROPELLER FAN: The Propeller draws outdoor air through louvering and cools Condenser, and then blows the hot air out.
* Heating condition is in opposition.
•CAPACITOR
The Capacitor enlarges the difference of phase between main coil so that the Compressor and Fan Motor starts well.
•ACCUMULATOR
The Accumulator blocks the unflow of liquid refrigerant and impurities into the Compressor.
CAUTION
In order to After Service convenience that the motor is common parts with Cooling only model, (This part is not
use of medium speed function so that the lead wire’s receptacle is taping)
Because of the motor supplies of having a lead wire’s receptacle when Heat Pump model’s After Service that it
is necessary to taping of lead-wire.

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5. GENERAL INFORMATIONS
•CHANGING AIR FLOW DIRECTION
Air flow deflectors divert air from center flow to left or right and up or down.
Adjust deflectors for desired air flow pattern.
•AIR FLOW AROUND UNIT
Check indoor grille and outdoor louvers for air flow obstructions. Do not block air flow to and from unit. The outdoor coil
should be checked and periodically cleaned for debris that may collect and block unit air flow. If air flow is obstructed or
deflected back into unit, the compressor may cycle on and off rapidly, causing early compressor failure.
•DRAIN HOLE AND WATER DRIPPING OUTSIDE
Locate drain hole at the rear or on the bottom of unit. Water in base pan is picked up by the fan blade and thrown onto the
warm outdoor coil where it evaporates. The air conditioner must be installed level or tilted slightly to the outside for proper
water disposal. On exceptionally hot and humid days the air conditioner may permit excess water to pass thru rear drain hole
or overflow. This should be considered normal.
•HOW TO INSTALL THE DRAIN CAP
This drain cap is not attached the rear the unit at the factory.
If you want to install the drain cap, please install the drain
cap like Fig. of the drain cap.
There are two kinds of method to install the drain cap.
The first method is that the shape of hole like
It is good for the household.
The second method is that the shape of hole is like
It is good for the shop.
•DOOR VENT
The door vent for the room air ventilation is lever type.
If the door vent lever moves to the left, then close the
vent and moves to the rght, then open the vent.
Door Vent
CLOSE VENT → OPEN
→
The rear side of the unit
Drain Cap
SEAL DRAIN
M4x8 SCREW: Use Screw(M4x8) only.

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•HOW TO ATTACH CABINET DRAIN
The air conditioner employs a proper drain method whereby the condensed water (moisture removed from the air) is
drained to the outside.
In very humid weather, excessive condensate water removed from the air may cause some water to collect. To remove
this excess water you can install the cabinet drain as detailed below.
1. Take the cabinet drain which is located in the upper styrofoam pad.
2. Remove the hole rubber from the base pan bottom hole.
3. Install the cabinet drain to the left corner of the cabinet with 3 screws.
4. Connect the drain hose to the outlet located at the bottom of the cabinet drain.
You can purchase the drain hose or tubing locally to satisfy your particular needs.
(Drain hose is not supplied)
CABINET
SCREW
CABINET
DRAIN
DRAIN HOSE
CAUTION
1. Remove “the Grille Front”from the unit.
2. Find “the Cabinet Drain”which is attached on rear side of “the Grille Front”.
- If you don’t remove it. the unit cannot be operated normally.
3. Assemble “the Cabinet Drain”according to the instruction of page 5
- “How to attach cabinet drain”
Inside of Grille Front
Remove the Cabinet Drain

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6. CARE AND MAINTENANCE
•AIR FILTER
Clean the air filter, which removes dust inside the room.
It should be washed at least once every week during operation.
1. Remove the Air Filter from the front grille by pulling to right.
2. Clean Air Filter with a vacuum cleaner or lukewarm, soapy water.
3. Shake it when clean to remove moisture completely. Reinstall.
•CLEANING THE AIR CONDITIONER
1. At least once a year, remove cabinet and thoroughly clean air conditioner.
Have the unit inspected by an authorized service man to ensure unit is
functioning properly.
2. Wash air conditioner with lukewarm, soapy water as needed.
Rinse and dry thoroghly.
3. If using concentrated liquid detergent, dilute in warm water first.
4. Front grille may be wiped off with a cloth dampened in a mild detergent
solution.
5. Cabinet may be washed with mild soap or detergent and lukewarm water,
then polished with liquid wax for appliances.
6. Condenser and Evaporator coils should be cleaned at the beginning of each cooling season. Use a soft brush or
vacuum cleaner to clean them, making sure that the Condenser and Evaporator coils are not damaged.
7. Do not use abrasive cleaners. These items scrach, crack and discolor surfaces.
CAUTION
To avoid death of personal injury due to electrical shock, turn fan control OFF and unplug
power cord before cleaning or performing maintenance. After cleaning or performing
maintenance, reconnect power.
NOTE
A dirty Air Filter reduces air flow and the cooling capacity.
Do not operate unit without Air Filter.
NOTE
To assure continued peak efficiency, condenser coils (weather side of unit) should be checked periodically and
cleaned if clogged with soot or dirt from the atmosphere.

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7. ELECTRICAL REQUIREMENTS
•ELECTRICAL GROUNDING INSTRUCTIONS
This appliance is equipped with a three-prong(grounding) plug for protection against possible shock hazards. If a two-prong
wall receptacle is encountered, the customer is required to contact a qualified electrician and have the two-prong wall
receptacle replaced with a properly grounded three-prong wall receptacle in accordance with the National Electrical Code.
•USE OF EXTENSION CORD
Because of potential safety hazards under a certain condition we strongly recommend against the use of an extension
cord. However, if you still elect to use an extension cord, it is absolutely necessary that it is earthed and the marked
rating of the extension cord should be 250V, 10A (MIN.)
The socket-outlet shall be installed near the equipment and shall be easily accessible.
•REPLACEMENT OF SUPPLY FLEXIBLE CORD.
It the supply flexible cord is damaged, it must be replaced by the manufacturer or its service agent or similarly qualified
person in order to avoid a hazard.
WARNING :
To avoid death, personal injury or properly damage due to electrical shock, this unit must be
grounded.
Do not under any circumstances cut or remove the round grounding prong from the plug.
Do not use a two prong adapter.
WARNING :
To avoid death, personal injury or properly damage due to electrical shock, do not use an
extension cord or pinch the power cord.
Do not remove the warning tag from the power cord.
CAUTION :
The appliance shall be installed in accordance with national wiring regulations.

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8. DESCRITION OF FUNCTIONS
•COOLING OPERATION
If the rotary switch is turned to “COOL”, the unit starts to cooling operation.
The power is not supplied to the de-ice controller P.C.B(Deicer PCB) in this mode.
The fan motor is “ON”when rotary switch is turned to “COOL”because RL1(on the P.C.B) is normally close.
•HEATING OPERATION
If the rotary switch is turned to “HEAT”, the unit starts to heating operation.
The power is supplied to the de-ice controller P.C.B in this mode.
Fan motor, Reversing valve, Lamp, (Heater Pump), these parts go on just turnning the rotary switch to “HEAT”because
RL1 is normally close.
The de-ice mode of heating operation is follows below.
•DE-ICE OPERATION
When the power is supplied by the turnning rotary switch to “HEAT”, the micro-computer chip(on the P.C.B) starts to
check the time and temperature.
Entering de-ice operation(to turn cooling cycle).
1. The micro-computer chip is check the temperature of condensor, After 50 minutes since the units starts on heating
mode.
2. If the Temperature is below -4˚C, RL1 goes on.
3. Then, all parts of concerning with RL1 go off also, such as Fan motor, Lamp, Reversing valve.
4. Now, the unit turned to cooling operation but fan motor is off.
Back to heat mode.
1. On the de-ice operation if the temperature is going over 15˚C, RL1 goes off.
2. Or 10minutes passed on the de-ice operation, RL1 goes off also.
3. Now the unit turned to heating mode because RL1 off means all parts turned on also.
such as Fan motor, Reversing valve, Lamp.
Remark : This de-ice operation is always repeat in heating mode when satisfying of the condition to enter the de-ice
operation.
ON
Time
50minutes 10minutes
Sensing
Temperature
Compressor
(Heater Pump)
Fan motor
(Reversing valve)
(Lamp)
ON
(-4°C) (15°C)
ON
OFF

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9. WIRING DIAGRAM

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10. REFRIGERANT CYCLE
Evaporator
Blower fan
MOTOR
CHECK
VALVE
Reversing
Valve
Accumulator
Propeller fan
Condenser
Refrigerant flow(COOLING)
Refrigerant flow(HEATING)
Capillary Tube
M
Compressor
D
C
S
E

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11. PCB DRIVING DESCRIPTION

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1. DC POWER SUPPLY
Refer to “C”(DC Power) in the circuit diagram
DC Voltages is needs +12[V] and +5[V].
DC +12[V] is used for relay control, and DC +5[V] is used for the micro-computer. and the peripheral hardware in the P.C.B.
DC +5[V] is regulated y IC2(7805S).
CE1, CE2, CC6, CC5 designed for voltage regulation or noise filtering.
2. RESET
Refer to “A”(reset) in the circuit diagram.
Number 4 (IC1) is used for reset the micro-computer when the power is on or off.
3. SENSOR VALUE INPUT
Refer to “B”(Sensor) in the circuit diagram.
Number 7 (IC1) is used for reading the value of the sensor.
Temperature is read on voltage instead of the resistance of the sensor.
4. AC LOAD CONTROL
Refer to “D”(AC Load) in the circuit diagram.
Nuber 5 (IC1) is used for control the relay(RL1).
RL1 controls Reversing valve, Lamp or Fan motor.
MICOM PIN ASSIGNMENT
1(VDD)
2
3
4(RESET)
VDD
no use
no use
Reset input
VSS(GND)
Sensor input
VREF
Relay control output
(VSS)8
7
(VREF)6
5
PIC12C671

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12. TROUBLE SHOOTING GUIDE
TROUBLE SITUATION ANALYSIS CAUSE REMEDY
Fan motor and
compressor do not run
Switch is in “cool”
position but the
compressor does not
run
1. Power failure
2. Power is supplied,
but the equipment
does not run
1. Not operating at all
2. Compressor
3. Frequent start and
stop
1) Power plug
2) Circuit breaker
1) receptacle
2) Operation switch
3) Cord or lead wire to
the switch
1) Compressor
2) Thermostat
3) Selector switch
4) O.L.P
5) Capacitor
1) Electricity
2) Room temperature
and outside
temperature
3) Compressor
4) O.L.P
5) Capacitor
1) Thermostat
2) Capacitor
3) O.L.P
1) Power failure
2) Circuit breaker is tripped
3) Power plug is not contacting
● Disconnection
● Mechanical failure of switch
1) Disconnection
2) Malfunction of contact
● Disconnection or burned-out
1) Failure
2) Malfunction
3) Knob is not set to the proper
setting
● Failure of malfunction of proper
setting
1) Turn over
● Lack of capacity
● Disconnection
1) The voltage exceeded allowed
range
2) Capacity of wire is not
sufficient
● Extremely high
● Burned-out
● Malfunction
● Lack of capacity
● Malfunction
● Lack of capacity
● Turn over
● Consult your electric company
● In case of a breaker, turn it on
and off a few times
● Replace the power plug
● Repair or replace the
receptacle
● Replace the cord or lead wire
● Replace the compressor or
connection wire
● Replace
● Repair or replace
● Turn knob for cooler setting
● Repair or replace the swtting
● Wait until return it.
● Replace
● Repair
● Consult your electric company
● Check the capacity of wire
● Ventilate well and remove the
heat source
● Replace
● Replace
● Replace
● Replace
● Replace
● Wait until return it.

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TROUBLE SITUATION ANALYSIS CAUSE REMEDY
The compressor runs
but the motor doesn’t
run
Both fan motor and
compressor are
running but cooling is
bad
Vibration & Noise
Water leakage into
room
Electric shock
(Leakage of current)
Not cooling at all
Insufficient cooling
1) Fan
2) Fan motor
3) Capacitor
4) Fan motor circuit
Refrigerant system
1) Refrigerant system
2) Filter
3) Heat exchanger of
condenser
1) Installation place
2) Fan
3) Fixing screws
4) Electric
components
●Installation condition
●Insulation of
components
● Blocked by others
●Disconnection or burned-out
electric cord
●Failure malfunction of contact
●Disconnection of malfunction of
contact
1) Refrigerant system is choked
2) Compressor failure
3) Leakage of refrigerant gas
1) Refrigerant system is choked
2) Compressor failure
3) Leakage of refrigerant gas
4) Refrigerant charge is too high
●Clogged up with dust
1) Fin is cogged up with dust
2) The ventilation is not good
3) The unit is exposed to the
sunlight
4) Other heat source is added in
the room
●Installation of the unit is
imperfectly done
1) Fan is contacted with
obstacles
2) Fixing bolt
●Have a screw loose
●Electrical noise
●The front is lower than rear side
1)Insulation defect of wiring and
lead wire
2) Leakgae of current due to the
dew or rust
●Repair
●Replace the fan motor
●Replace
●Check the circuit
●Repair
●Repair
●Recharge refrigerant gas
●Check and repair refrigerant
system
●Replace
●Check a part of Leakage and
repair
●Repair and recharge
●Clean the air fiter
●Clean the unit
●Shade the unit from the
sunlight
●Remove the added heat source
●Install the unit perfectly
●Remove obstacles
●Tighten the bolt
●Tighten the screw
●Exchange the components
●Make rear side of the unit lower
than the front
●Check the unit’s Leakage of
current.
●Replace the defective parts or
components

18
TROUBLE SHOOTING
If you find the ice on the outdoor side, please check the P.C.B as following.
1) P.C. B test function.
1) Remove the sensor connector from the P.C.B.
2) Supply the power
3) Short the sensor connector (pin 1 and 3 of CN1) for 3 seconds over.
4) If the relay(RL1) is on and off just one time, the P.C.B. is regard of correct.
5) Connect the sensor to the P.C.B. again.
2) R-T TABLE OF SENSOR.
3) RELAY CHECK
If the resistance is “zero”between the two pin L1 and L3, the relay(RL1) is O.K.
(The check must be conducted after the power supply cord is removed.)
4) If the P.C.B, Sensor, Relay are correct all, please check the other parts.
TEMP(°C)
-5
-4
-3
-2
-1
0
1
2
3
4
5
R(KOhm)
43.67
41.35
39.18
37.13
35.21
33.4
31.69
30.08
28.57
27.14
25.79
Voltage(V)
1.117
1.165
1.213
1.264
1.315
1.368
1.421
1.474
1.529
1.584
1.641
TEMP(°C)
6
7
8
9
10
11
12
13
14
15
16
R(KOhm)
24.52
23.31
22.18
21.11
20.11
19.14
18.23
17.38
16.56
15.81
15.07
Voltage(V)
1.696
1.753
1.811
1.868
1.926
1.984
2.043
2.101
2.16
2.218
2.277

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13. HOW TO DISASSEMBLE
1 Before service of 1. Stop the unit, remove the power cord from the receptacles.
any part. 2. Move the unit to the safe location for the suitable work.
2 Ass’y Fan Motor 1. Remove Front Grille
- Fan Motor - Remove Filter Pre.
- Propeller Fan - Remove screw(2 point) in Front Grille.
- Blower Fan 2. Remove Cabinet from the unit.
- Remove screws (4 point) from the unit’s sides.
3. Remove Holder Scroll.
4. Remove Scroll upper
5. Remove Ass’y Control Box
- Remove screws (4 point).
- Remove wires in the each components.
6. Remove wires in the Panel Housing.
7. Remove screws (4 point) from Ass’y Fan Motor’s sides.
- Ass’y Fan Motor is assembly of Fan Motor, Propeller and Blower Fan, Orifice
and Panel Housing.
8. Lift the Ass’y Fan Motor from the unit.
9. Remove Clip Fan (2 point) from the shaft of Fan Motor.
10. Remove Propeller Fan from the shaft of Fan Motor.
11. Remove Blower Fan from the shaft of Fan Motor.
12. Remove Fan Motor from Panel Housing.
- Remove screws (4 point).
3 Ass’y Control Box 1. Same as the procedure 1 to 5 in the Item 2.
-
Rotary Switch (selector)
- Thermostat
- Capacitor
- Power Cord
4 O.L.P 1. Same as the procedure 1 to 2 in the Item 2.
2. Remove Terminal Cover from Compressor.
- Remove hex-nut (1 point).
Please refer to the chapter 14 (Exploded diagram and parts list).