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Service Manual - Page 1
website http://www.lgservice.com e-mail http://www.lgeservice.com/techsup.html
LG
LG Ceiling Cassette Air Conditioner
SERVICE MANUAL
MODEL: LCN240CP/LCU240CP LC240CPI/LC240CPO LCN340CP/LCU340CP LC340CPI/LC340CPO
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Service Manual - Page 3
...
AT-C243HLF0
AT-C343HLF0
1
7.03
9.96
24
34
1Ø, 208-230V, 60Hz
❈ Local model name
Factory AT-C243HLF0 AT-C343HLF0
Local Model 1
Indoor
Outdoor
LCN240CP
LCU240CP
LCN340CP
LCU340CP
Local Model 2
Indoor
Outdoor
LC240CPI
LC240CPO
LC340CPI
LC340CPO
Service Manual 3 Models List
1. Model line up
1.1 Indoor units
Category Type
Chassis
Ceiling
cassette 4-way
TH...
Service Manual - Page 9
...be controlled by pair, considering its installation environment. - Auto Restart Operation :
-
Service Manual 9 The diagonal two louvers are on / off condition, operating mode, set temperature and fan speed.The unit..., selection of Floor Temp. With the help of the slide switch at the installed product and indoor temperature. Open(Conventional)
2.4%
100% Improved
Swirl Swing(New)
4.8%
...
Service Manual - Page 11
Service Manual 11 Note :
O : Applied, X : Not applied, - : No relation Option: Model name & price are different ... of Functions
List of Functions
• Ceiling Cassette
Category
Function
AT-C243HLF0
AT-C343HLF0
Air flow
Air purifying Installation Reliability
Convenience
Individual Control CAC Network Function Special Function Kit Others
Air supply outlet Airflow direction control (left &...
Service Manual - Page 15
... 1. Level Difference of connectable unit
Compressor
Type
(constant)
Qty * model
Motor Type
Oil charge volume
cc
Oil type
Refrigerant
Charge(at 7.5m(25ft))
g(oz)
Type
Control
Heat Exchanger Rows.../h × 0.0002931 CFM = CMM × 35.3
Service Manual 15 AWG)
Power and transmission cable
No. * mm2(No. Specifications
Outdoor Unit
Rated Capacity Cooling
kW
Btu/h
Heating
kW
Btu...
Service Manual - Page 21
Cooling Only Models
INDOOR UNIT
OUTDOOR UNIT
Refrigerant Cycle Diagrams
Capillary Tube
H/EX
Gas Side
Thermistor
Accumulator
Check Valve
High pressure S/W Thermistor
Check Valve
Thermistor (...
1/4
5/8
Piping length (ft.)
Rated
Max.
25
100 115
Elevation (ft.)
Rated
Max.
16
50
16
66
Additional Refrigerant
(oz/ft) 0.22 0.32
Service Manual 21
Refrigerant Cycle Diagrams
1.
Service Manual - Page 23
...Outdoor
5~7mm (0.20~0.28inch)
Service Manual 23 M10
CAUTION • ...paper model
• The following parts is conveyed to the outdoor side using a Ø 70(2.76inch) hole-core drill. Bolt
Installation Tubing connection
3. 2. Indoor Unit Installation
150mm...W3/8 or M10)
Paper model for installation
Adjust the same height
Set screw of paper model (4 pieces)
Open the ceiling board along ...
Service Manual - Page 32
...Current
: less than 8°C(14.4°F)
Current
: near the rated cur-
Check temperature and pressure of refrigerant leaked out. Difference Operating Current
Temp.
Troubleshooting Guide
Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air depends on room air humidity.
difference : approx...
Service Manual - Page 33
.... Refer to the self-diagnosis function.
Check the Auto Addressing Work
Confirm Auto Addresssing work method
Replace the PCB Ass'y * The product's operation starts at all.
Is the voltage of wires
Check... of indoor unit and terminal block?
Electronic Parts Troubleshooting Guide
Trouble 1 The Product doesn't operate at three minutes after main power turning on
Service Manual 33
Service Manual - Page 35
... 10kΩ / at least. Trouble 3 When cooling does not operate
Turn on Main Power
Troubleshooting Guide
Operate "Cooling Mode( )" by setting the desired temperature of the remote ...support transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to be effected by 1°C at 25°C(77°F)). COMP) for COMP
Below DC 1V (app)
About DC12V
Service Manual...
Service Manual - Page 37
Trouble 5 When Vertical Louver does not operate
Troubleshooting Guide
• Confirm that the Vertical Louver is normally geared with the ...8226; Confirm that are no problems after above checks
• Confirm the assembly conditions that there is DC +12V between pin (RED) of the Vertical Louver
Service Manual 37
If there are catching and interfering parts in the rotation radial of CN...
Service Manual - Page 38
...times 4 times 5 times 6 times
Indoor Status ON OFF OFF OFF OFF OFF OFF
Outdoor Error
Error Code
Description
21
DC Peak(IPM Fault)
22
CT2(Max CT)
23
DC Link Low Volt
24... Conditioner Troubleshooting Guide
Self-diagnosis Function
I Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark ...
Service Manual - Page 39
Troubleshooting Guide
Troubleshooting CH01, CH02, CH06
Display code
01
Title Indoor air sensor
Cause of each sensor. 3.
Estimate the voltage of error
• Open / Short • Soldered poorly • Internal circuit error
• Open / Short 02 Indoor inlet pipe sensor • Soldered poorly
• Internal circuit error...
Check Point
1. Service Manual 39 Unplug the ...Repair...
Service Manual - Page 42
Troubleshooting Guide
Troubleshooting CH05, CH53
Display code
Title
05
/
Communication
53
(Indoor ¡ Outdoor)
Cause of error
Check point & Normal condition
• Communication poorly
• ...GND1, GND2, and main GND. 6. If one indoor unit is operated normally, outdoor PCB is no problem. ¡ Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed ...
Service Manual - Page 45
...; / at 25°C(77°F) (Unplugged) • Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Check Point
1. Estimate the voltage of each sensor.(Plugged)
3. Troubleshooting Guide
Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65
Display code
Title
41 D-pipe sensor (Inverter)
Cause of the sensor is 0 V or 5Vdc, then sensor is abnormal.
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