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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
...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
...Service Manual 9 Open(Conventional)
2.4%
100% Improved
Swirl Swing(New)
4.8%
Comparison of Floor Temp. Air Flow can be done. Two Thermistor Control :
- The diagonal two louvers are on / off condition, operating mode, set... be controlled by pair, considering its installation environment. - There may be controlled ...installed product and indoor temperature. After one is opposite. It ...
Service Manual - Page 15
...(constant)
Qty * model
Motor Type
Oil charge volume
cc
Oil type
Refrigerant
Charge(at 7.5m(... transmission cable
No. * mm2(No. elevation Indoor unit - Outdoor unit
m(ft)
AT-C243HLFO (LCU240CP / LC240CPO)
7.03 24,000
2.5 11.5 24 1 / 208-230 / 60 3 * ...× 0.0002931 CFM = CMM × 35.3
Service Manual 15 Specifications
Outdoor Unit
Rated Capacity Cooling
kW
Btu/h
Heating
kW...
Service Manual - Page 21
...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 ...
Liquid
1/4
1/2
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
Service Manual - Page 23
...Service Manual 23 Settlement of outdoor unit
• Anchor the outdoor unit with a bolt and nut(ø10mm(0.39inch)) tightly and horizontally on a concrete or rigid mount.
• When installing...accessory)
Nut (W3/8 or M10)
Paper model for installation
Adjust the same height
Set screw of paper model (4 pieces)
Open the ceiling board along ...model
• The following parts is option. 2.
Service Manual - Page 32
...Cassette Air Conditioner The suction pressure is low. Difference Operating Current
Temp. rated current
Temp. Check temperature and pressure of Check refrigeration cycle. Troubleshooting Guide
Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Temp. Current
: less than 8°C(14.4°F)
Current
: near the rated cur- The temperature can be measured by attaching...
Service Manual - Page 33
... of CN-POWER in outdoor PCB ASS'Y about AC220/240V? Electronic Parts Troubleshooting Guide
Trouble 1 The Product doesn't operate at three minutes after main power turning on
Service Manual 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...
Service Manual - Page 35
... for COMP
Below DC 1V (app)
About DC12V
Service Manual 35
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 indoor temperature and connector are...
Service Manual - Page 37
Trouble 5 When Vertical Louver does not operate
Troubleshooting Guide...parts in the rotation radial of CN-U/D and GND.
If there are no problems after above checks
• Confirm the assembly conditions that there is detected when rotating the Vertical Louver with the shaft of Stepping Motor.
• If the regular torque is DC +12V between pin (RED) of the Vertical Louver
Service Manual...
Service Manual - Page 38
... OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
38 Ceiling Cassette Air 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 is ON/OFF for the operation LED of evaporator body in the same...
Service Manual - Page 39
... KΩ or ∞, then sensor is abnormal. ¡ Repair or Change the PCB. Service Manual 39
Troubleshooting Guide
Troubleshooting CH01, CH02, CH06
Display code
01
Title Indoor air sensor
Cause of each sensor. 7. Estimate the resistance of error
• Open / Short • Soldered poorly • Internal circuit error
• Open / Short 02 Indoor inlet pipe sensor •...
Service Manual - Page 42
... Guide
Troubleshooting CH05, CH53
Display code
Title
05
/
Communication
53
(Indoor ¡ Outdoor)
Cause of error
Check point & Normal condition
• Communication poorly
• Power input AC 220V. (Outdoor, Indoor) • The connector for communication is abnormal. If one indoor unit is operated normally, outdoor PCB is no problem. ¡ Check the another indoor...
Service Manual - Page 45
Troubleshooting Guide
Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65
Display code
Title
41 D-pipe sensor (Inverter)
Cause of each sensor.(Plugged)
3. Estimate the resistance of error
• Open / Short • Soldered poorly • Internal circuit error
• Open / Short
44
Air sensor
• Soldered poorly
• Internal circuit error
• Open / Short 45 ...
Service Manual - Page 51
... low handle on the charge set to purge the air. (Be careful of the cylinder. - however, one time is different from previous procedures.
Mount the valve stem nuts and the service port nut. -
Open the valve at the bottom of the liquid refrigerant). Because you are using a gas cylinder.
3. Service Manual 51 Connect the charge...
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