Daewoo DWB-072C User manual

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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.......................................................................................................................6
6. CARE AND MAINTENANCE.......................................................................................................................7
7. TROUBLE SHOOTING GUIDE...............................................................................................................8~9
8. HOW TO DISASSEMBLE..........................................................................................................................10
9. WIRING DIAGRAM.....................................................................................................................................11
10. REFRIGERANT CYCLE ..........................................................................................................................12
11. EXPLODED DIAGRAM AND PARTS LIST.....................................................................................13~16

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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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2. GENERAL SPECIFICATIONS
ITEM MODEL DWB-072C DWB-092C
Function Cooling only
Power source 220-240V, 50Hz
Cooling Capacity Btu/h 7,200 8,600
Kcal/h 1,814 2,167
Energy Btu/Wh 9.86 9.89
Efficiency Ratio Kcal/Wh 2.48 2.49
Dehumidification Pts/h 2.43 2.66
g/h 1,105 1,210
Electrical Data Power Input (W) 730 870
Running Current (A) 3.1 3.6
Compressor
Type ROTARY
Model RBB070A011 RBB090A011
Capacitor 25µF/400VAC 30µF/400VAC
Model YSLA-35-4N YSLA-35-4P
Fan Motor Capacitor 2µF/400VAC 3µF/400VAC
Indoor-Fan Blower-Fan
Outdoor-Fan Propeller-Fan
Refrigerant(R-22) Control Capillary
Charge Amount(g) 15.2oz(430g) 18.4oz(520g)
Dimensions Unit(W x H x D) 18.9(W)x14.6(H)x19.5(D) inch / 480(W)x369(H)x497(D) mm
PACKING(W x H x D) 21.1(W)x17.6(H)x21.9(D) inch / 535(W)x446(H)x556(D) mm
Weight Net Weight 62.7lbs(28.5kg) 64.9lbs(29.5kg)
Gross Weight 66lbs(30kg) 68.2lbs(31kg)

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3.NAMES OF MAJOR COMPONENTS
NO PART NAME
1 CABINET
2 BLADE VERTICAL
3 BLADE HORIZENTAL
4 KNOB BLADE
5 GRILLE FRONT
NO PART NAME
6 KNOB SELECTOR
7 KNOB THERMOSTAT
8 AIR FILTER
9 CONTROL PANEL
1
2
8
4
3
6
9
7
5

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4. FUNCTION OF MAIN COMPONENTS
1. ROTARY SWITCH (SELECTOR)
Please refer to the part of selector in the chapter 9 (Wiring Diagram).
The rotary switch (selector) controls the fan motor’s rotation speed, and has five positions.
The function of the five position is as follow.
●OFF: This position stops all operations of the air conditioner.
●HIGH COOL: This position provides the maximum air flow for rapid
cooling, dehumidifying and dust removing operations.
(Use this position on sultry summer days.)
●LOW COOL: This position provides the minimum air flow for quiet
cooling, dehumidifying operations.
(Use this position on suitable for night-time.)
●HIGH FAN: This position provides the maximum air fiow alone fan
operation without cooling operation.
●LOW FAN: This position provides the minimum air flow air flow alone
fan operation without cooling operation.
2. THERMOSTAT (TEMPERATURE CONTROL)
●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.
3. MOTOR
The motor is used to rotate the indoor and outdoor fan so that the room air can be recirculated.
4. FAN
●BLOEWR 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.
5. CAPACITOR
The Capacitor enlarges the difference of phase between main coil and sub coil so that the Compressor and Fan Motor
starts well.
6. ACCUMULATOR
The Accumulator blocks the unflow of liquid refrigerant and impurities into the Compressor.
SELECTOR
HIGH
COOL
HIGH
FAN
LOW
COOL
LOW
FAN
OFF
THERMOSTAT

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5. GENERAL INFORMATIONS
1. CHANGING AIR FLOW DIRECTION
Air flow deflectors divert air from center flow to left or right.
Adjust deflectors for desired air flow pattern.
2. AIR FLOW AROUND UNIT
Check in door grill 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.
3. 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.
4. USE OF EXTENSION CORDS
Because of potential safety hazards under certain conditions 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 or more.
5. DRAIN HOLE AND WATER DRIPPING OUTSIDE
Locate drain hole at the rear 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 tited or 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.

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6. CARE AND MAINTENANCE
1. 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 grill by pulling up.
2. Clean Air Filter with a vacuum cleaner or lukewarm, soapy water.
3. Shake it when clean to remove moisture completely. Replace it.
2. CLEANING THE AIR CONDITIONER
1. At least once a year, remove cabinet and thoroughly clean air conditioner. Have the unit inspected by an authorized
servicer to ensure unit is functioning properly.
2. Wash air conditioner with lukewarm, soapy water as needed. Rinse and dry thoroughly.
3. If using concentrated liquid detergent, dilute in warm water first.
4. Front grill 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 scratch, crack and discolor surfaces.

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7. 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) Disconnection
2) Malfunction of contact
•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
•Malfunction
•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
•Repair
•Repair or replace
•Replace
•Repair
•Consult your electric company
•Check the capacity of wire
•Ventilate well and remove the
heat source
•Replace
•Replace
•Replace
•Replace
•Replace
•Replace

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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

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8. 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 Grill
- Fan Motor - Remove Filter Pre.
- Propeller Fan - Remove screw(1 point) in Front Grill.
- Blower Fan 2. Remove the unit from Cabinet
- Remove screws (2 point) from the unit’s sides.
- Pull the unit from Cabinet
3. Remove Scroll upper.
4. Remove Plate Scroll
- Remove screws (3 point) from Plate Scroll’s sides.
5. Remove Ass’y Control Box
- Remove screws (3 point).
- Remove wires in the each components.
6. Remove wires in the Panel Housing.
7. Remove screws (7 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 hex-nut (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 11 (Exploded diagram and parts list).