LG LB-E4880HL User manual

Ceiling Duct Air Conditioner
SVC MANUAL(Exploded View)
MODEL : LB-E4880HL
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Internal Use Only
http://biz.lgservice.com

Contents
Functions 3
Product Specifications (Cooling & Heating) 5
Dimensions 6
Refrigeration Cycle Diagram 7
Wiring Diagram 8
Operation Details 9
Installation of Indoor, Outdoor Unit 12
Test Running 23
3-way Valve 25
Cycle Troubleshooting Guide 30
Electronic Parts Troubleshooting Guide 31
Electronic Control Device 34
Schematic Diagram 35
Exploded View 36
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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only

Functions
Room temperature sensor. (Thermistor)
Maintains the room temperature in accordance with the Setting Temp.
Indoor fan is delayed for 5 seconds at the starting.
Restarting is inhibited for approx. 3 minutes.
High, Med, Low
Intermittent operation of fan at low speed.
The setting temperature, indoor fan speed and desired operation mode are automatically set.
Both the indoor and outdoor fan stops during defrosting.
Hot start after defrost ends.
The indoor fan stops until the evaporator piping temperature will be reached at 28°C.
Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
Soft Dry Operation Mode
Deice (defrost) control (Heating)
Hot-start Control (Heating)
Auto Operation
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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only

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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Remote Controller
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Room Temperature Display
Temperature Setting
Setting the Time or Timer
(Cooling
model only) (Heating
model only)
(Low) (Med) (High)
Cooling Operation Mode ( )
Heating Operation Mode ( )
Soft Dry Operation Mode ( )
Fan Operation Mode
HIMEDLO
Set
: High:39°CLOW:11°C
: Fan Operates without cooling & heating
Cooling Heating
Down to 18°C
Up to 30°C
Down to 16°C
Up to 30°C
When the air conditioner is turned off by a power failure, it is restarted
automatically after a power resupply.
✓

- 5 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Product Specifications (Cooling & Heating)
Model Name
Volt
Item Unit
Cooling Capacity Btu/h(W)
Heating Capacity Btu/h(W)
Power Source , V, Hz
Indoor
Outdoor
Input Cooling
Heating
Running Current Cooling
Heating
E.E.R. Btu/h-W
Indoor
Outdoor
Indoor
Outdoor
Refrigerant (R-22) g
Remocon Type
Liquid
Gas
Drain Hose
Connecting Wire
Main Power Cable
Time Delay Safety Function
Soft Dry
Fan Speed (Indoor)
Timer
Self-Diagnosis
Air Circulation m3/min
Dimensions
(W H D)
Net. Weight
mm
kg
W
A
LB-E4880HL
380-415V
Service Valve &
Connecting Tube
48,000 (12,090)
48,000 (12,090)
3ø380-415V~, 50Hz
50
105
6,000
5,500
10
10
8.0
1,230 x 370 x 680
900 x 1,220 x 370
70
95
5,000
L.C.D
1/2" (12.7)
3/4" (19.05)
O
1.25mm2
2.5mm2
O
O
3 (Hi, Med, Low)
24Hrs
O

- 6 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Dimensions
MODEL:LB-E4880HL
Indoor Unit
900
1220
370
1230 680
370
Outdoor Unit

- 7 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Refrigeration Cycle Diagram
• MODEL: LB-E4880HL
(Rated performance for refrigerant line length of: 5m)
For installation over rated distance, 70g of refrigerant should be added for each meter.
ex) When installed at a distance of 15m, 525g of refrigerant should be added.
(15-7.5) x 70g = 525g
Pipe size(Diameter: ø) Piping length(m) Elevation(m)
MODEL
Gas Liquid Rated Max. Rated Max.
LB-E4880HL 3/4" 1/2" 5 30 5 30 70
INDOOR UNIT OUTDOOR UNIT
HEAT
EXCHANGER HEAT
EXCHANGER
COMPRESSOR
GAS SIDE
LIQUID SIDE
COOLING
HEATING
REVERSING
VALVE
CHECK VALVE
CAPILLARY TUBE
Additional
refrigerant
(g/m)

Wiring Diagram
MODEL: LB-E4880HL
• Indoor Unit
• Outdoor Unit
- 8 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
2
E
4
FMi
TRANS
WH
BL
BK
GN/YLGN/YL
RD
OR
CN-TRANS2
PWB ASM
CN-POWER
CN-TRANS1
Hi Med Low
CN-MOTOR
RY-FAN RY-4WAY RY-COMP
CN-OUT
1
3
E
DC-12V SIGNAL GND
Remo.
CN-REMO
INDOOR ELECTRIC CIRCUIT
INDOOR UNITOUTDOOR UNIT
(RD) (YL) (BR)
P/NO : 3854A90021R
4
5
3
1
2
COi
GN/YL
CN-TH
EVA
TH
ROOM
TH1
RTM
3Ø, 380-415V, 50Hz
POWER SUPPLY
STN
BK
BK
BK
WH
WH
WH
RD
OR
BK
63H2
WH
D.P CTH
TNS NO NC
WH
OR
BK 52F1
52C 1
2
3
4
5
6
31
T/B1
T/B2
32
B
A
F1
FMo
49FMo
FMo
49FMo
YL BK
OR
BK
T3
T2 T1
RD
WH
CM
12
34
56
78
YL BK
OR
BK
BK
BK
CH BK
WH
BL
BL
WH
Co Co
20SV
WH
F1
BK
BK
BK
CH
NOTE
BL : BLUE
BK : BLACK
OR : ORANGE
GN/YL : GREEN/YELLOW
RD : RED
WH : WHITE
YL : YELLOW
Outdoor Unit Wiring Diagram
RTM
3Ø, 380-415V, 50Hz
POWER SUPPLY
STN
BK
BK
BK
WH
WH
WH WH
RD
OR
BK
63H2
WH
D.P CTH
TNS NO NC
WH
OR
BK 52F1
52C 1
2
3
4
5
6
31
T/B1
T/B2
32
B
A
FMo
49FMo
FMo
49FMo
YL BK
OR
BK
T3
T2 T1
RD
WH
CM
12
34
56
78
YL BK
OR
BK
BK
BL
BL
WH
WH
Co Co
20SV
BK
WH
BL
RD
GN/YL
GN/YL
TMo
To the indoor unit
1
2
3
4
5
6
BK
WHWH YL
BK
RD
F1
63H2
C TH
49FMo
20SV
CM
HIGH PRESSURE SWITCH FOR HEATING
THERMISTOR FOR PIPE TEMP.
INTERNAL T.P FOR FMo
REVERSING COIL
COMPRESSOR
52C
TM
52F1
D.P
CH
MAGNECTIC CONTACTOR
MAIN TERMINAL BLOCK
RELAY FOR FMo
DEICER PCB
CRANKCASE HEATER
Co
FMo
F1
TMo
RUN CAPACITOR FOR FMo
OUTDOOR FAN MOTOR
FUSE (250V,10A)
TERMINAL BLOCK
P/NO : 3854A90021S
F1

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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Operation Details
(1) The function of main control
1. Time Delay safety Control
•3min The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)
•30sec The 4-way valve is ceased for 30sec. to prevent the refrigerant-gas abnormal noise when the Heating
operation is OFF or switched to the other operation mode while compress is off.
While compressor is running, it takes 3~5 seconds to switch.
2. Soft-Dry Operation
•The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of
already being set to the best speed for Dry Operation by Micom Control.
3. Cooling Mode Operation
•When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con-
troller and the operation diagram is as following
Intake Air temp.
COMP. ON
(SET TEMP.+0.5°C)
COMP. OFF
(SET TEMP. -0.5°C) More than More than
3 minutes 3 minutes
Selecting Selecting Selecting
fan speed fan speed fan speed
COMPRESSOR ON OFF ON OFF ON
INDOOR FAN Low Low

- 10 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Intake Air temp.
Setting temp.+3°C
(Compressor OFF)
Setting temp.
(Compressor ON)
INDOOR FAN Low OFF Low Low OFF
COMPRESSOR ON OFF ON OFF
A point; While the indoor Heat-Exchanger temperature is higher than 35°C fan operates at low speed, when
it becomes lower than 35˚C fan stops.
B point; When the indoor Heat-Exchanger temperature is higher than 35°C, fan operates at seleted fan
speed, when it becomes lower than 35°C, the fan operates at low speed for 10sec, after 10sec, it
operates at seleted fan speed.
4. Heating Mode Operation (Except Cooling Model)
The unit will operate according to the setting by the remote controller and the operation diagram is shown as following.
Hot Start Low
Selecting
Fan Speed
minimum 3min
Selecting fan
speed
minimum
10sec.
1min
AA
minimum
1min.
minimum
10sec.
B
5. Hot-Start Control
The indoor fan stops until the evaporator piping temperature will be reached to 28°C.
The operation diagram is as following.
PIPING
TEMPERATURE 1min
COMPRESSOR
INDOOR FAN
ON
26°C
: Selected Fan : Low Fan : Fan Stop
28°C