LG LWC1260ACG Service Manual ▷ View online
CONTENTS
1. PREFACE
This SERVICE MANUAL provides various service information, the mechanical and electrical parts, etc. This
room air conditioner was manufactured and assembled under a strict quality control system.
The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit.
room air conditioner was manufactured and assembled under a strict quality control system.
The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit.
1. PREFACE
1.1 SAFETY PRECAUTIONS
2
1.2 INSULATION RESISTANCE TEST
2
1.3 SPECIFICATIONS
3
1.4 FEATURES
5
1.5 CONTROL LOCATIONS
5
2. DISASSEMBLY INSTRUCTIONS
2.1 MECHANICAL PARTS
7
2.1.1 FRONT GRILLE
7
2.1.2 CABINET
7
2.1.3 CONTROL BOX
7
2.2 AIR HANDLING PARTS
8
2.2.1 AIR GUIDE
8
2.2.2 BLOWER
8
2.2.3 FAN, SHROUD
9
2.3 ELECTRICAL PARTS
9
2.3.1 OVERLOAD PROTECTOR
9
2.3.2 COMPRESSOR
9
2.3.3 CAPACITOR
10
2.3.4 POWER CORD
10
2.3.5 THERMOSTAT
10
2.3.6 ROTARY SWITCH
10
2.3.7 MOTOR
11
2.4 REFRIGERATING CYCLE
11
2.4.1 CONDENSER
11
2.4.2 EVAPORATOR
11
2.4.3 CAPILLARY TUBE
12
3. TROUBLE SHOOTING GUIDE
3.1 OUTSIDE DIMENSIONS
14
3.2 PIPING SYSTEM
14
3.3 TROUBLE SHOOTING GUIDE
16
4. SCHEMATIC DIAGRAM
4.1 CIRCUIT DIAGRAM
21
4.2 ELECTRONIC CONTROL DEVICE
24
4.3 COMPONENTS LOCATION
(OF MAIN P.C.B ASM)
25
4.4 COMPONENTS LOCATION
(FOR DISPLAY P.C.B ASM)
25
5. EXPLODED VIEW
26
6. SVC PARTS LIST
27
1.1 SAFETY PRECAUTIONS
1. When servicing the unit, set the ROTARY
SWITCH or POWER SWITCH to OFF and unplug
the power cord.
the power cord.
2. Observe the original lead dress.
If a short circuit is found, replace all parts which
have been overheated or damaged by the short
circuit.
have been overheated or damaged by the short
circuit.
3. After servicing the unit, make an insulation resis-
tance test to protect the customer from being
exposed to shock hazards.
exposed to shock hazards.
1.2 INSULATION RESISTANCE TEST
1. Unplug the power cord and connect a jumper
between 2 pins (black and white).
2. The grounding conductor (green & yellow) should
be open.
3. Measure the resistance value with an ohm meter
between the jumpered lead and each exposed
metallic part on the equipment at all the positions
(except OFF) of the ROTARY SWITCH.
metallic part on the equipment at all the positions
(except OFF) of the ROTARY SWITCH.
4. The value should be over 1M
Ω
.
—2—
2. DISASSEMBLY INSTRUCTIONS
– Before disassembling, turn the POWER SWITCH to OFF and disconnect the power cord.
2.1 MECHANICAL PARTS
2.1.1 FRONT GRILLE
1. Open the INLET GRILLE upward and remove the
air filter.
2. Remove the screw which fastens the FRONT
GRILLE.
3. Pull the FRONT GRILLE from the right side.
4. Remove the FRONT GRILLE.
5. Re-install the components by referring to the
4. Remove the FRONT GRILLE.
5. Re-install the components by referring to the
above removal procedure. (See figure 1)
2.1.2 CABINET
1. After disassembling the FRONT GRILLE, remove
the two screws which fasten the CABINET at both
sides.
sides.
2. Remove the two screws which fasten the CABI-
NET at back.
3. Pull the BASE PAN forward. (See figure 2)
2.1.3 CONTROL BOX
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the 3 screws which fasten the CON-
2. Remove the 3 screws which fasten the CON-
TROL BOX.
3. Pull the CONTROL BOX forward about 10-15cm.
4. Discharge the CAPACITOR by placing a 20,000
4. Discharge the CAPACITOR by placing a 20,000
ohm resistor across the capacitor terminals.
5. Remove two wire housings in the control box.
6. Pull the control box forward completely.
7. Re-install the components by referring to the
6. Pull the control box forward completely.
7. Re-install the components by referring to the
above removal procedure. (See figure 3)
(Refer to the CIRCUIT DIAGRAM found on pages
22 and 23 in this manual and on the control box.)
(Refer to the CIRCUIT DIAGRAM found on pages
22 and 23 in this manual and on the control box.)
—7—
THERMOST
AT
OPERA
TION
THERMOST
AT
OPERA
TION
O
Figure 1
Figure 2
Figure 3
2.2 AIR HANDLING PARTS
2.2.1 AIR GUIDE
1. Remove the front grille. (Refer to section 2.1.1)
2. Remove the cabinet. (Refer to section 2.1.2)
3. Pull the cover E.P.S upward.
4. Remove 3 screws which fasten the UPPER AIR
2. Remove the cabinet. (Refer to section 2.1.2)
3. Pull the cover E.P.S upward.
4. Remove 3 screws which fasten the UPPER AIR
GUIDE.
5. Push the two hooks which fasten the UPPER AIR
GUIDE and remove the UPPER AIR GUIDE.
6. Re-install the components by referring to the
above removal procedure. (See figure 4 and 5)
2.2.2 BLOWER
1. Remove the upper air guide. (Refer to section
2.2.1)
2. Move the evaporator sideward carefully.
3. Remove the clamp which secures the blower with
3. Remove the clamp which secures the blower with
a hand plier. (See figure 6)
4. Remove 2 screws which fasten the MOTOR
MOUNT.
5. Pull the BLOWER forward by dragging the motor
mount upward carefully.
6. Remove the BLOWER.
7. Re-install the components by referring to the
7. Re-install the components by referring to the
above removal procedure. (See figure 7)
—8—
THERMOST
AT
OPERA
TION
O
Figure 4
Figure 5
Figure 6
Figure 7
2.2.3 FAN, SHROUD
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the 4 screws which fasten the con-
2. Remove the 4 screws which fasten the con-
denser.
3. Move the condenser sideward carefully.
4. Remove the clamp which secures the FAN with a
4. Remove the clamp which secures the FAN with a
hand plier.
5. Remove the FAN.
6. Remove the SHROUD.
7. Re-install by referring to the above removal pro-
6. Remove the SHROUD.
7. Re-install by referring to the above removal pro-
cedure. (See figure 8 and 9)
2.3 ELECTRICAL PARTS
2.3.1 OVERLOAD PROTECTOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the nut which fastens the TERMINAL
2. Remove the nut which fastens the TERMINAL
COVER.
3. Remove the terminal cover.
4. Remove all the leads from the OVER LOAD
4. Remove all the leads from the OVER LOAD
PROTECTOR.
5. Remove the overload protector.
6. Re-install the components by referring to the
6. Re-install the components by referring to the
above removal procedure.
(See figures 10 and 11)
(See figures 10 and 11)
2.3.2 COMPRESSOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Discharge the refrigerant system using a Freon™
2. Discharge the refrigerant system using a Freon™
Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the Freon™. Leave the valve in place after servic-
ing the system.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the Freon™. Leave the valve in place after servic-
ing the system.
3. Remove the overload protector. (Refer to section
2.3.1)
4. After purging the unit completely, detach the suc-
tion tube and the discharge tube at the compres-
sor connections.
sor connections.
5. Remove the 3 nuts and the 3 bracket washers
which fasten the compressor.
6. Remove the compressor.
7. Re-install the components by referring to the
7. Re-install the components by referring to the
above removal procedure. (See figure 12)
—9—
Figure 8
Figure 9
Figure 12
Figure 10
Figure 11
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