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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 2
... Drawings 16 8. Refrigerant Cycle Diagrams 21 10. Trouble Shooting Guide 32 12. (3-Way)Valve ...48 13. TABLE OF CONTENTS
Table of Functions ...11 5. Specifications ...14 7. Safety Precautions ...4 3. Wiring Diagrams...19 9. Feature & Benefits ...8 4. Models List ...3 2. Installation ...22 11. Function of Remote Control 12 6. Exploded View and Replacement Parts List 53...
Service Manual - Page 3
...kW kBtu /h
Chassis
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 Model line up
1.1 Indoor units
Category Type
Chassis
Ceiling
cassette 4-way
TH...
Service Manual - Page 9
... are on / off condition, operating mode, set temperature and fan speed.The unit will start with same memorized condition. Service Manual 9 With the help of the two temperatures....option to eliminate this problem. - Open(Conventional)
2.4%
100% Improved
Swirl Swing(New)
4.8%
Comparison of Floor Temp. Easily controlled by pair, considering its installation environment. - There...
Service Manual - Page 15
...Drive Side discharge 51(1801) 55 6.35(1/4) 12.7(1/2) 30(100) 15(50)
AT-C343HLFO (LCU340CP /LC340CPO)
9.96 34,000
3.6 17 38 2 / 208-230 / 60 3 * 3.3(... = Btu/h × 0.0002931 CFM = CMM × 35.3
Service Manual 15 Indoor Temperature 26.7°C(80°F) DB /19.4°C(66.9°...
Type
(constant)
Qty * model
Motor Type
Oil charge volume
cc
Oil type
Refrigerant
Charge(at 7.5m(25ft))
...
Service Manual - Page 21
...
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. 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 (Air)
Heat...
Service Manual - Page 29
...power sources specification. (Particularly note the relation between cable length and thickness.) 8) Never fail to equip a leakage breaker where it is wet or moist. 9) The following troubles would be guided by ... minutes or more than 8°C(14.4°F).
Service Manual 29 As for the method of
wiring, be caused by the circuit diagram pasted on the contact point there of the ...
Service Manual - Page 32
... relatively higher, temperature difference is usually 4.5~6.0 kg/cm2G at the beginning of refrigeration cycle
rated current
Defective compressor
Temp. Check temperature and pressure of refrigerant leaked out.
Troubleshooting Guide
Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Temp.
High pressure does not quickly rise at normal condition. 2.
The...
Service Manual - Page 33
Electronic Parts Troubleshooting Guide
Trouble 1 The Product doesn't operate at three minutes ...diagram wiring on the control panel Check the main power. Check the Auto Addressing Work
Confirm Auto Addresssing work method
Replace the PCB Ass'y * The product's operation starts at all. Troubleshooting Guide
Turn off the main power and wait until LED on outdoor PCB is off
Turn on
Service Manual...
Service Manual - Page 35
... Heat Exchanger(EVA). Trouble 3 When cooling does not operate
Turn on Main Power
Troubleshooting Guide
Operate "Cooling Mode( )" by setting the desired temperature of the remote controller is less than one of the indoor temperature by the temperature of DC part in relay for COMP
Below DC 1V (app)
About DC12V
Service Manual 35
When in bad...
Service Manual - Page 38
...
D-Pipe High(INV)
33
D-Pipe High(Normal)
40
CT Sensor(open/short)
41
INV. 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 is ON/OFF for the operation LED of evaporator body in the same manner...
Service Manual - Page 39
...Troubleshooting Guide
Troubleshooting CH01, CH02, CH06
Display code
01
Title Indoor air sensor
Cause of the sensor is 0 KΩ or ∞, then sensor is abnormal. ¡ Repair or Change the PCB. Unplug the sensor on Indoor unit PCB and Power ON. 6. If the resistance of error...Ω Ω
2.5Vdc V
Check the resistance
Check the voltage
Check Point
1. Service Manual 39
Service Manual - Page 42
...If one indoor unit is operated normally, outdoor PCB is no problem. ¡ Check the another indoor unit. * CH05 is displayed...and GND. (Normal : Over 2MΩ) 4. Check Point
1.
Troubleshooting Guide
Troubleshooting CH05, CH53
Display code
Title
05
/
Communication
53
(Indoor ¡ Outdoor)
Cause of error
Check point & Normal condition
• Communication poorly
• Power input...
Service Manual - Page 45
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.
Ω
If the voltage of error
• Open / Short • Soldered poorly • Internal circuit error
• Open / Short
44
Air sensor
• Soldered poorly
• Internal circuit error
&#...
Service Manual - Page 51
... and charge the system with larger amounts of the liquid refrigerant).
Open the low handle on the charge set to the charging cylinder. - Open the valve at a time (approximately 150g(5.3oz) each time) while operating the air conditioner in the cooling cycle; Service Manual 51 The procedure is the same if using a gas cylinder...
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