LG LWB0760ACL Service Manual ▷ View online
—17—
4. TROUBLESHOOTING GUIDE
4.1 OUTSIDE DIMENSIONS
487mm(19 / ")
3
16
218mm(8 / ")
15
26
510mm(20 / ")
1
16
353mm(13 / ")
7
8
487mm(19 / ")
3
16
218mm(8 / ")
15
26
510mm(20 / ")
1
16
353mm(13 / ")
7
8
OPERATION
COO
L
FA
N
HIGH
HIGH
LOW
LOW
THERMOSTAT
5
4
3
2
1
9
8
7
6
CO
O
LE
R
0
o
CAPILLARY TUBE
COMPRESSOR
BLOWER
EVAPORATOR COIL
: REFRIGERANT FLOW
CONDENSER COIL
FAN
MOTOR
4.2 PIPING SYSTEM
The following is a brief description of the important components and their function in what is called the refrigeration system.
Reference should made to figure 22 to follow the refrigerating cycle and the flow of the refrigerant in the cooling cycle.
Reference should made to figure 22 to follow the refrigerating cycle and the flow of the refrigerant in the cooling cycle.
Discharge the refrigerant system using a
Freon
Freon
TM
Recovery System. If there is no valve
to attach the recovery system, install one
(such as a WATCO A-1) before venting the
Freon
(such as a WATCO A-1) before venting the
Freon
TM
. Leave the valve in place after
servicing the system. Do not vent Freon
TM
into
the atmosphere.
MOTOR
COMPRESSOR
OIL
(LIQUID REFRIGERANT)
CAPILLARY TUBE
OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH
AIR FOR REFRIGERANT
PASS THROUGH
SUCTION LINE
COOL LOW PRESSURE VAPOR
COOL LOW PRESSURE VAPOR
COOLED
AIR
AIR
COMPLETE LIQUID
BOIL OFF POINT
BOIL OFF POINT
LIQUID
PRESSURE
DROP
PRESSURE
DROP
ROOM AIR HEAT LOAD
VAPOR INLET
HOT
DISCHARGED
AIR
DISCHARGED
AIR
LIQUID OUTLET
HIGH PRESSURE VAPOR
LIQUID REFRIGERANT
LOW PRESSURE VAPOR
ROOM AIR CONITIONER
EVAPORATOR COILS
CONDENSER COILS
CYCLE OF REFRIGERATION
Figure 22
—26—
COMPLAINT
CAUSE
REMEDY
If not running, determine the cause. Replace if
required.
required.
Remove the cabinet, inspect the interior surface of
the condenser. If restricted, clean carefully with a
vacuum cleaner (do not damage fins) or brush.
Clean the interior base before re-assembling.
the condenser. If restricted, clean carefully with a
vacuum cleaner (do not damage fins) or brush.
Clean the interior base before re-assembling.
If the condenser fins are closed over a large area on
the coil surface, head pressures will increase,
causing the compressor to cycle.
Straighten the fins or replace the coil.
the coil surface, head pressures will increase,
causing the compressor to cycle.
Straighten the fins or replace the coil.
Test the capacitor.
Check the terminals. If loose, repair or replace.
Check the system for a restriction.
If restricted, clean or replace.
Close if open.
Determine if the unit is properly sized for the area to
be cooled.
be cooled.
Check the set screw, or clamp. If loose or missing,
correct. If the blower or fan is hitting scroll or barrier,
rearrange the air handling parts.
correct. If the blower or fan is hitting scroll or barrier,
rearrange the air handling parts.
Remove the cabinet and carefully rearrange the
tubing not to contact the cabinet, compressor,
shroud and barrier.
tubing not to contact the cabinet, compressor,
shroud and barrier.
Fan motor
Condenser air flow
restriction
restriction
Condenser fins
(damaged)
(damaged)
Capacitor
Wiring
Refrigeration system
Air filter
Exhaust damper door
Unit undersized
Blower or fan
Copper tubing
Compressor cycles on
overload
overload
Insufficient cooling
Excessive noise
—18—
4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused from an electrical defect. The other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
The one is called Starting Failure which is caused from an electrical defect. The other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
Unit runs but poor cooling is ineffective.
Ineffective Cooling
Check of outdoor coil
(heat exchanger) & fan
operation.
(heat exchanger) & fan
operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
44~50°F(7~10°C)
temperature difference of
inlet & outlet air ;
44~50°F(7~10°C)
Check heat load
increase.
increase.
Clean condenser.
Not on separate circuit
Check inside gas
pressure.
pressure.
Adjusting of refrigerant
charge
charge
Malfunction of compressor
Replacement of
compressor
compressor
Check of cold air circulation
for smooth flow.
for smooth flow.
Dirty indoor coil
(Heat exchanger)
(Heat exchanger)
Remove obstruction.
Check clogging in
refrigeration circuit.
refrigeration circuit.
Repair clogging in
refrigeration circuit.
refrigeration circuit.
Obstruction at air outlet
Clogged of air filter
Malfunction of fan
—19—
Fails to Start
Check of circuit breaker
and fuse.
and fuse.
Gas leakage of feeler bulb
of thermostat
of thermostat
Check of control switch.
Only fan fails to start.
Improper wiring
Defect of fan motor
capacitor
capacitor
Resistance irregular motor
( ).
Insulation irregular motor
( ).
( ).
Insulation irregular motor
( ).
Replacement of fan motor
Regular but fails to start
Replacement of compressor
(Locking of rotor, metal)
(Locking of rotor, metal)
Improper thermostat setting
Loose terminal connection
Improper wiring
Irregular motor resistance ( )
Irregular motor insulation ( )
Replacement of compressor
(Motor damaged)
(Motor damaged)
Drop of power voltage
Check capacitor.
Replacement
Only compressor fails to
start.
start.
Defect of compressor
capacitor
capacitor
Check of power source.
Check of control switch
setting.
setting.
Click on the first or last page to see other LWB0760ACL service manuals if exist.