LG LC340CPO, LC340CPI, LC240CPO, LCN340CP, LCU340CP Service Manual

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.

TABLE OF CONTENTS

Table of contents			Page
1.	Models List .......................................................................................................................		3
2.	Safety Precautions ...........................................................................................................		4
3.	Feature & Benefits ...........................................................................................................		8
4.	List of Functions .............................................................................................................		11
5.	Function of Remote Control ...........................................................................................		12
6.	Specifications .................................................................................................................		14
7.	Dimensional Drawings ...................................................................................................		16
8.	Wiring Diagrams.............................................................................................................		19
9.	Refrigerant Cycle Diagrams ...........................................................................................		21
10.		Installation ....................................................................................................................	22
11.		Trouble Shooting Guide................................................................................................	32
12.		(3-Way)Valve ................................................................................................................	48
13.		Electronic Control Device.............................................................................................	52
14.		Exploded View and Replacement Parts List ................................................................	53

2 Ceiling Cassette Air Conditioner

Models List

Models List

1. Model line up

1.1 Indoor units

					Model names
Category	Type	Chassis			Capacity, kW(kBtu/h)
				7.03(24)		9.96(34)
Ceiling	4-way
cassette			TH	AT-C243HLF0		AT-C343HLF0

1.2 Outdoor units

Cooling only		AT-C243HLF0		AT-C343HLF0
No. of connectable indoor units			1
Total capacity index of connectable	kW	7.03		9.96
indoor units	kBtu/h	24		34
Power supply		1Ø, 208-230V, 60Hz

Chassis

Local model name

		Local Model 1			Local Model 2
Factory
	Indoor		Outdoor	Indoor		Outdoor
AT-C243HLF0	LCN240CP		LCU240CP	LC240CPI		LC240CPO
AT-C343HLF0	LCN340CP		LCU340CP	LC340CPI		LC340CPO

Service Manual 3

Safety Presautions

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must be followed.

■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

■ Meanings of symbols used in this manual are as shown below.

Be sure not to do.

Be sure to follow the instruction.

Do not use a defective or underAlways ground the product.			Install the panel and the cover
rated circuit breaker. Use this			of control box securely.
appliance on a dedicated circuit.

•There is risk of fire or electric shock.

•There is risk of fire or electric shock.

•There is risk of fire or electric shock.

Always install a dedicated circuit and breaker.

•Improper wiring or installation may cause fire or electric shock

Use the correctly rated breaker or fuse.

•There is risk of fire or electric shock.

Do not modify or extend the power cable.

•There is risk of fire or electric shock.

4 Ceiling Cassette Air Conditioner

Safety Presautions

Do not install, remove, or re-	Be cautious when unpacking
install the unit by yourself	and installing the product.
(customer).
• There is risk of fire, electric shock,	• Sharp edges could cause injury.
explosion, or injury.	Be especially careful of the case
	edges and the fins on the con-
	denser and evaporator.

Do not install the product on a	Be sure the installation area
defective installation stand.	does not deteriorate with age.

For installation, always contact the dealer or an Authorized Service Center.

•There is risk of fire, electric shock, explosion, or injury.

Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open.

•It may cause injury, accident, or damage to the product.

•If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.

•Moisture may condense and wet or damage furniture.

Do not touch(operate) the product with wet hands.

•There is risk of fire or electrical shock.

Do not place a heater or other appliances near the power cable.

•There is risk of fire or electric shock.

Do not let electric parts of the product get wet.

•There is risk of fire, failure of the product, or electric shock.

Service Manual 5

Safety Presautions

Do not store or use flammable gas or combustibles near the product.

If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable.

• There is risk of fire or failure of product.

• There is risk of electric shock or fire.

Gasolin

Be cautious that water could not enter the product.

• There is risk of fire, electric shock, or product damage.

Install the drain hose to ensure that water is drained away properly.

• A bad connection may cause water leakage.

6 Ceiling Cassette Air Conditioner

Safety Presautions

Keep level even when installing the product.

• To avoid vibration or water leakage.

Use two or more people to lift and transport the product.

• Avoid personal injury.

90˚

■ Operational

Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.

• There is risk of fire, electric shock, or damage to the

Do not touch the metal parts of the product when removing the air filter. They are very sharp!

• There is risk of personal injury.

Wax

Thinner

Do not step on or put anyting on the product. (outdoor units)

• There is risk of personal injury and failure of product.

Do not insert hands or other objects through the air inlet or outlet while the product is operated.

•There are sharp and moving parts that could cause personal injury.

Service Manual 7

Features & Benefits

Features & Benefits

Environment Friendly Refrigerant :

-LG Ceiling Cassette Air Conditioners uses environment friendly refrigerant, which don't do any harm to the environment.

Plasma Air Purifier :

-It removes not only microscopic contaminants & dust, but also house mites, pollen, and pet fur to help preventing allergic diseases like asthma.It provides odor free, dust free and allergy free air.

		Dust
Dust particles		electrode
	Ionizer	discharge
Pre-filter		Dusts Collection
	+6.5KV	++
Polluted	discharge	+	Purified
Air		+	fresh Air
		+
Odour	Generating	dusts	aluminum coated
	plasma
		Odor molecule	electrode(-)

(3.25KV discharge)

1 2 ........ 16

Group Control :

-It enables to control as much as 16 units with the help of one wired remote controller. All the units will follow same setting of temperature & other sub functions.

Central Control :

-It enables to control 16 x 8 = 128 units with the help of 8 controllers. All units can be put on and off from one Central Room. For Setting Temperature, Fan Speed and other sub functions, access the respective LCD wired remote controller of each unit.

Jet Cool :

-In this mode, quick and fast cooling is done. Cold and high velocity air is supplied to the room till the indoor temperature reaches 18°C(64°F). The unit will continue to run in jet cool mode till the Indoor temperature reaches 18°C(64°F).

........

Main	M	M	M	M	M	M
PCB	1	2	16	17	18	128
	Sub	Sub	Sub	Sub	Sub	Sub
	1	2	16	17	18	128

Controller	Controller	Controller
# 1	# 2	# 8

8 Ceiling Cassette Air Conditioner

Features & Benefits

Swirl Swing

-It is the function for comfort cooling/heating operation.

-The diagonal two louvers are opened the more larger than the other louvers.

After one minute, it is opposite.

Comparison of Floor	4- Open(Conventional)	Swirl Swing(New)
Temp. Distribution(20°C)

2.4%

100% Improved

4.8%

Comparison of Air Flow Types

4- Open(Conventional)

Swirl Swing(New)

Vane 2

Vane 1

Vane 1

Open

Close

Open

Close

Open

Close

Vane 2

Vane 2

Open

Open

Close

Open

Close

Open

Vane 3

Vane 3

Vane 1

Vane 3

Open

Close

Open

Close

Open

Close

Vane 4

Vane 4

Open

Open

Close

Open71

Close

Open

Time

Time

Vane 4

Space Control

Vanes angle can be controlled by pair, considering its installation environment.

-For example direct drafts can be annoying, leading to discomfort and reduced productivity vane control helps to eliminate this problem.

-Easily controlled by wired remote control.

-Air Flow can be controlled easily regarding any space environment.

Auto Restart Operation :

-Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same mode prior to the power failure. Memorized condition are on / off condition, operating mode, set temperature and fan speed.The unit will memorize the above conditions and start with same memorized condition.

Two Thermistor Control :

-There may be a significant difference between the temperature taken at the installed product and indoor temperature. Two thermistor control provides option to control temperature by referring any of the two temperatures. With the help of the slide switch at the back of the LCD wired remote controller, selection of the desired thermistor for controlling the unit can be done. One thermistor is in the Indoor unit & the other one is in the LCD wired remote.

Service Manual 9

Features & Benefits

High Ceiling Operation

-According to the height of ceiling installation, it provides variability of indoor fan motor rpm. If the height of installation is low then you can adjust low rpm of indoor fan motor. On the other hand if the height of the installation is high you can adjust high rpm of indoor fan motor. Selection of speed can be done by slide switch at the back of the LCD wired remote.

ex:

Selection	Height	RPM
Lower	2.4m(7.9ft)	700/600/500
Standard	2.7m(8.9ft)	750/650/550
Higher	3.0m(9.8ft)	800/700/600

Water Drain Pump :

-In some of the places natural drainage is not possible. For such places drain pump is very useful. It removes condensed water from the unit.

Time Delay Safety Function :

-It delays restarting of the compressor by three minutes thereby preventing damage to the compressor.

Zero Standby Power:

-Due to SMPS (Switching Modulation Power Supply) technology, there is almost zero power consumption in the standby mode.

Child Lock Function:

-It prevents the children or others from tampering the control buttons. Unit can be controlled by the wireless remote controller. This can be easily set by pressing timer key & Min key simultaneously. After child lock is set, pressing any key will displaye CL on the LCD for 3 seconds and all the keys will be ineffective.

Self Diagnosis Function:

-This function provides diagnosis of the unit. An error code will be displayed on the LCD wired remote controller & diagnosis can be done as per the code indication. The same is also printed on key cover of the LCD wired remote controller.

5~6W
	30m
	0.5W
Others	LG
	30m

CHILD LOCK -Display

10 Ceiling Cassette Air Conditioner

List of Functions

List of Functions

• Ceiling Cassette

	Category	Function	AT-C243HLF0	AT-C343HLF0
		Air supply outlet	4	4
		Airflow direction control (left & right)	X	X
		Airflow direction control (up & down)	Auto	Auto
		Auto swing (left & right)	X	X
	Air flow	Auto swing (up & down)	O	O
		Airflow steps(Fan / Cool / Heat)	3/4/-	3/4/-
		CHAOS swing	X	X
		CHAOS wind (Auto wind)	X	X
		Jet cool (Power wind)	O	O
		Swirl wind	O	O
		Deodorizing filter	X	X
	Air purifying	Plasma air purifier	O	O
		Prefilter(Washable)	O	O
		Drain pump	O	O
	Installation	E.S.P. control	-	-
		Electric heater (Operation)	-	-
		High ceiling operation	O	O
		Hot start	X	X
	Reliability	Self diagnosis	O	O
		Soft dry operation	O	O
		Auto changeover	X	X
		Auto cleaning	X	X
		Auto operation(Artificial intelligence)	O	O
		Auto restart operation	O	O
	Convenience	Child lock	O	O
		Forced operation	O	O
		Group control	Option	Option
		Sleep mode	-	-
		Timer (On/Off)	O	O
		Timer (weekly)	O	O
		Two thermistor control	O	O
		Standard wired remote controller	O	O
		Deluxe wired remote controller	-	-
	Individual Control	Simple wired remote controller	-	-
		Wired remote controller(for hotel use)	-	-
		Wireless remote controller(simple)	-	-
		Wireless LCD remote controller	PQWRHSF0	PQWRHSF0
		General central control(Non LGAP)	Option	Option
	CAC Network	Dry contact	Option	Option
		Simple central control(LGAP)	Option	Option
	Function
		PDI(Power Distribution Indicator)	Option	Option
		PI 485	Option	Option
	Special Function Kit	CTIE	X	X
		Zone control	X	X
	Others	Thermistor	-	-

Note :

O : Applied, X : Not applied, – : No relation

Option: Model name & price are different according to options, and assembled in factory with main unit.

Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package.

Service Manual 11

Function of Remote Control

Function of Remote Control

1. Wireless LCD Remote Control

Signal transmitter

5			1
6
			3
4
2			10
		CANCEL
			9
7	OFF	SET
ON			12
11		AUTO CLEAN
8			17
		°C/°F	18
13
			14
15
			16

Flip-up door (opened)

Operation Mode

Cooling Operation

Auto Operation

Healthy Dehumidification Operation

1. START/STOP BUTTON

Operation starts when this button is pressed and stops when the button is pressed again.

2. OPERATION MODE SELECTION BUTTON

Used to select the operation mode.

3.ROOM TEMPERATURE SETTING BUTTONS

Used to select the room temperature.

4.INDOOR FAN SPEED SELECTOR

Used to select fan speed in four steps

low, medium and high.

5. JET COOL

Used to start or stop the speed cooling.(speed cooling operates super high fan speed in cooling mode.)

6. AUTO SWING BUTTON

Used to stop or start louver movement and set the desired up/down airflow direction.

7.ON/OFF TIMER BUTTONS

Used to set the time of starting and stopping operation.

8.TIME SETTING BUTTONS

Used to adjust the time.

9.TIMER SET/CANCEL BUTTON

Used to set the timer when the desired time is obtained and to cancel the Timer operation.

10.SLEEP MODE AUTO BUTTON

Used to set Sleep Mode Auto operation.

11.AIR CIRCULATION BUTTON

Used to circulate the room air without cooling.

12.ROOM TEMPERATURE CHECKING BUTTON

Used to check the room temperature.

13.PLASMA AIR CLEAN BUTTON

Used to start or stop the plasma-purification function.

14.HORIZONTAL AIRFLOW DIRECTION CONTROL BUTTON (OPTIONAL)

Used to set the desired horizontal airflow direction.

15.RESET BUTTON

Used prior to resetting time.

16.2nd F Button

Used prior to using modes printed in blue at the bottom of buttons.

17.AUTO CLEAN (OPTIONAL)

Used to set Auto Clean mode.

18.°C/°F SWITCH BUTTON

Used to switch temperature reading from Centigrade to Fahrenheit.

The wireless remote controller do not operate the swirl mode.

12 Ceiling Cassette Air Conditioner

Function of Remote Control

2. Wired LCD Remote Control

AUTO SWING

OPERATION

SET TEMP

FAN SPEED

SUB FUNCTION

Room Temp

HI

AUTO

Heater

Preheat

1

MED

JET

Defrost

Humidify

LO

SLo

Filter

Out door

2ndF

Time

ZONE

1 2 3 4

Timer

Operation unit

No Func

Program set

On Off

Set no. Time

01

03

05 07

09 11 13

15 17

19

21

23

3

17

10

11

12

13

14

15

16

18

Timer Cancel 2ndF

Program Week Holiday

Plasma

Set/Clr

Hour Min

RESET

2

5

6

4

7

8

9

1 Operation display

Displays the operation conditions.

2 On/Off Button

Operation starts when this button is pressed, and stops when the button is pressed again.

3 Set Temperature Button

Used to set the temperature when the desired temperature is obtained.

4 FAN Operation Button

Used to circulate room air without cooling.

5 Fan Speed & Jet Cool Button

Used to set the desired fan speed and select jet cool mode.

6 Operation Mode Selection Button

Used to select the operation mode.

•Auto Operation Mode

•Cooling Operation Mode

•Soft Dry Operation Mode

7 Auto Swing Button

Used to swing up and down.

8 Room Temperature Checking Button

Used to check the room temperature.

9 Plasma Air Clean Button

Used to start or stop the plasma-purification function.

10 Timer Cancel Button

Used to cancel the timer.

11 Timer Set Button

Used to set the timer when the desired time is obtained.

12 Week Button

Used to set a day of the week.

13 Program Button

Used to set the weekly timer.

14 Holiday Button

Used to set a holiday of the week.

15 Time Set Button

Used to set the time of the day and change the time in the weekly timer Function.

16 Set and Clear Button

Used to set and clear the weekly timer.

17 Swirl Button

Used to select swirl swing mode.

18 Reset Button

Used to set the current time and clear the setting time.

Service Manual 13

Specifications

Specifications

	Indoor unit type		Ceilling Cassette - 4way
	Model		AT-C243HLF0	AT-C343HLF0
			(LCN240CP / LC240CPI)	(LCN340CP / LC340CPI)
Power supply		Phase/Volts/Hz	1 / 208-230 / 60	1 / 208-230 / 60
Cooling capacity		kW	7.03	9.96
		Btu/h	24,000	34,000
Heating capacity		kW	-	-
		Btu/h	-	-
Current	Nominal running current	A	1.0	1.0
Fan	Motor Type		BLDC	BLDC
	Fan Type		Turbo Fan	Turbo Fan
	Motor Output(W) * number of units		50.6 * 1	50.6 * 1
	Air flow rate (H/M/L)	cmm	18.4/17.0/15.6	24.1/22.7/21.2
		cfm	650/600/550	850/800/750
	Capacitor	mF/V	-	-
	Drive		DC	DC
Coil	Row * stages * FPI	mm	2R * 9C * 18	2R * 9C * 18
Dimensions	Body	mm(inch)	840 * 840 * 225(331/16 * 331/16 * 87/8)	840 * 840 * 225(331/16 * 331/16 * 87/8)
(W*D*H)	Decorative Panel	mm(inch)	950 * 950 * 30(3713/32 * 3713/32 * 13/16)	950 * 950 * 30(3713/32 * 3713/32 * 13/16)
Net Weight	Body	kg(lbs)	26(57.3)	26(57.3)
	Decorative Panel	kg(lbs)	3(6.61)	3(6.61)
Gross Weight	Body	kg(lbs)	30(66)	30(66)
	Decorative Panel	kg(lbs)	4(9)	4(9)
Air filter			Long Life filter	Long Life filter
Sound Level (H/M/L)		dB(A)+3	38/35/32	40/37/34
Piping Connections	Liquid	mm(inch)	6.35(1/4)	6.35(1/4)
	Gas	mm(inch)	12.7(1/2)	15.88(5/8)
Drain	OD/ID	mm(inch)	32/25(1.26/0.98)	32/25(1.26/0.98)
Dehumidification rate		l/h(pts/h)	3.0(6.3)	3.7(7.8)
Safety Devices			Fuse, Thermal protector for Fan motor
Temperature sensor			Thermistor	Thermistor
Refrigerant			R410A	R410A
Refrigerant control			EEV	EEV
Connectable outdoor Unit			Single	Single
Power and Transmission interunit cable		No.* mm2 (No. AWG)	4 * 2.1(14)	4 * 2.1(14)

Note :

1.Capacities are based on the following conditions:

Cooling: - Indoor Temperature 26.7°C(80°F) DB /19.4°C(67°F) WB

-Outdoor Temperature 35°C(95°F) DB /23.9°C(75°F) WB Piping Length - Interconnecting Piping Length 7.5m(25ft)

-Level Difference of Zero.

Conversion Formula

kW = Btu/h × 0.0002931

CFM = CMM × 35.3

14 Ceiling Cassette Air Conditioner

Specifications

		Outdoor Unit		AT-C243HLFO	AT-C343HLFO
				(LCU240CP / LC240CPO)	(LCU340CP /LC340CPO)
Rated Capacity		Cooling	kW	7.03	9.96
			Btu/h	24,000	34,000
		Heating	kW	-	-
			Btu/h	-	-
Rated Input		Cooling	kW	2.5	3.6
		Heating	kW	-	-
Energy Label				-	-
Testing combination				-	-
Running current		Cooling	A	11.5	17
		Heating	A	-	-
Starting current		(Cooling/Heating)	A	24	38
Power supply			Phase / Volts / Hz	1 / 208-230 / 60	2 / 208-230 / 60
Power supply Cable(outdoor)			No. * mm2(No. AWG)	3 * 2.1(14)	3 * 3.3(12)
Power and transmission cable			No. * mm2(No. AWG)	4 * 2.1(14)	4 * 2.1(14)
Dimensions		W * H * D	mm(inch)	870 * 800 * 320(341/2 * 311/2 * 1219/32)	900 * 1160 * 370(357/16 * 4511/16 * 149/16)
Net weight			kg(lbs)	73(160)	86(190)
Gross weight			kg(lbs)	78(172)	93(205)
Maximum number of connectable unit				1	1
Compressor		Type		ROTARY	ROTARY
(constant)		Qty * model		2*GK120KAA	GJ151KAA + GJ208KAA
		Motor Type		Induction	Induction
		Oil charge volume	cc	700	1200
		Oil type		PVE	PVE
Refrigerant		Charge(at 7.5m(25ft))	g(oz)	2100(74.1)	2500(88.2)
		Type		R410A	R410A
		Control		EEV	EEV
Heat Exchanger		Rows * Column * FPI		2R * 36C * 20	2R * 52C * 18
		Defrosting method		-	-
Fan		Capacitor	mF/Vac	6 / 370	6 / 370
		Drive		Direct Drive	Direct Drive
		Discharge Direction	Side / Top	Side discharge	Side discharge
		Air flow rate	cmm(cfm)	51(1801)	105(3708)
Noise level(H)		Sound press, 1m	db (A) + 3	55	58
Piping connections		Liquid	mm(inch)	6.35(1/4)	6.35(1/4)
		Gas	mm(inch)	12.7(1/2)	15.88(5/8)
Max. piping length		Main piping	m(ft)	30(100)	35(115)
Max. elevation		Indoor unit - Outdoor unit	m(ft)	15(50)	20(66)

Note :

1. Capacities are based on the following conditions:

Cooling: - Indoor Temperature 26.7°C(80°F) DB /19.4°C(66.9°F) WB - Outdoor Temperature 35°C(95°F) DB /23.9°C(75°F) WB

Piping Length - Interconnecting Piping Length 7.5m(25ft)

- Level Difference of Zero.

Conversion Formula

kW = Btu/h × 0.0002931

CFM = CMM × 35.3

Service Manual 15

Dimensional Drawings

Dimensional Drawings

1. Indoor Units

Model No.: LCN240CP/LC240CPI/LCN340CP/LC340CPI

900(35.4) (ceiling opening)

840(33.1)

688(27.1) (hanging bolt)

225(8.9)

950(37.4)	950(37.4)	806(31.7)(hanging bolt)		900(35.4)(ceilingopening)
			840(33.1)
	950(37.4)
	950(37.4)
	1	840(33.1)
		688(27.1)
950(37.4)	3
	2
				806(31.7)	840(33.1)
	R35(1
	.
	4)

			840(33.1)	6
	4
30(1.18)	5			225(8.9)
	135(5.3)	76(3.0)

7

* mm(inch)

No.

Part Name

Remark

1Decoration panel

2Air suction grille

3Air discharge grille

4Gas pipe connection

5Liquid pipe connection

6Drain pipe connection

7Power supply connection

16 Ceiling Cassette Air Conditioner

Dimensional Drawings

2. Outdoor Units

Model No.: LCU240CP/LC240CPO

	870(34.3)
	546(21.5)	160(6.3)
	320(12.6)			340(13.4)	360(14.2)
		54.6(2.1)		10(0.4)
	333(13.1)				320(12.6)
808(31.8)	782.5(30.8)
	392(15.4)	Ø
		531(20.
		9)
	25.5(1.0)	80(3.1)	50(2.0)		*mm(inch)

Service Manual 17

Dimensional Drawings

Model No.: LCU340CP/LC340CPO

900(35.4)
550(21.7)	175(6.9)

370(14.6)

395(15.6)

15(0.6)

	520(20.5)	1
565(22.2)		1135(44.7)	1165(45.9)

273(10.7)	124(4.9)	80(3.1)
	308(12.1)

370(14.6)

4

65(2.6)

3

2

5

*mm(inch)

No.

Part Name

Remark

1Air discharge grille

2Gas pipe connection

3Liquid pipe connection

4Power & transmission connection

5Earth screw

18 Ceiling Cassette Air Conditioner

Wiring Diagrams

Wiring Diagrams

1. Indoor Unit

LCN240CP/LC240CPI/LCN340CP/LC340CPI
Connector Number	Location

CN-POWER	AC power supply
CN-MOTOR	BLDC fan motor output
CN-DPUMP	Drain pump output
CN-DISP	Display
CN-FLOAT	Float switch input
CN-REMO	Remote control
CN-CC	Dry-contact
CN-ROOM	Room sensor
CN-PIPE1	In-pipe thermistor
CN-PIPE2	Out-pipe thermistor
CN-GRILL	Elevation grille
CN-PTC	PTC Heater
CN-HVB	HVB Ass'y (Air cleaner)

Service Manual 19