LG LM-2320C2L/M Service Manual

Multi Type Room Air Conditioner

SERVICE MANUAL

MODEL: LM-2320C2L/M

Functions...................................................................................................................................... 3

Product Specifications................................................................................................................ 5

Dimensions................................................................................................................................... 6

Refrigeration Cycle Diagram....................................................................................................... 8

Wiring Diagram ............................................................................................................................ 9

Operation Details ....................................................................................................................... 10

Display Function........................................................................................................................ 14

Self-diagnosis Function ............................................................................................................ 14

Installation.................................................................................................................................. 15

Operation.................................................................................................................................... 29

Disassembly of the parts (Indoor Unit).................................................................................... 31

2-way, 3-way Valve..................................................................................................................... 33

Cycle Troubleshooting Guide ....................................................................................................37

Electronic Parts Troubleshooting Guide.................................................................................. 38

Electronic Control Device ......................................................................................................... 44

Schematic Diagram.................................................................................................................... 45

Exploded View and Replacement Parts List............................................................................ 46

- 2 -

Contents

- 3 -

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, Chaos

--- Lights up in operation

--- Lights up in Sleep Mode

--- Lights up in Timer Mode

--- Lights up in Compressor operation(for Cooling model)

• Intermittent operation of fan at low speed.

• The fan is switched to low(Cooling) speed.

• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.

• The fan is switched to intermittent or irregular operation

•

The fan speed is automatically switched from high to low speed.

• The louver can be set at the desired position or swing up and down automatically.

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

Operation indication Lamps (LED)

OUT

DOOR

Health Dehumidification Operation

Sleep Mode Auto Control

Natural Air Control by CHAOS Logic

Airflow Direction Control

- 4 -

Remote Controller

JET COOL

Healthy Dehumidification Operation Mode.

( )

Operation Mode Selection

(Cooling

model only)

Cooling Operation Mode.( ) Auto Operation Mode.( )

Sleep Operation

Fan Operation Mode

Room, Temperature Display

Setting the Time or Timer

Airflow Direction Control

Operation ON/OFF

Temperature Setting

TEMPERATURE

LOWHIGH

Timer Selection

ON OFF

Timer Setting

SET

Timer Cancel

CANCEL

Reset

Fan Speed Selection

(Low) (Med) (High) (CHAOS)

: (High: 39°C LOW : 11°C)

Down to 18°C Up to 30°C

Cooling

: OFF, ON, OFF ON

: Cancel Sleep Mode, Timer ON or Timer OFF

: 1, 2, 3, 4, 5, 6, 7, Off Timer

: Fan Operates without cooling.

- 5 -

Product Specifications

22,700(5,720) 14,000(3,528) 8,700(2,192)

2.9 1.7 1.2 1Ø, 220V, 60Hz

Indoor 9.0 7.0 Outdoor 41 Indoor 41 + 1 38 + 1 Outdoor 55 + 1

2,400 1,500 1,050

10.9 6.8 4.7

9.46 9.33 8.3 Indoor 13 7.5 Outdoor 61 Indoor(A/B)

888 x 287 x 170 / 802 x 262 x 165 Outdoor 870 x 655 x 320 Indoor(A/B)

9 / 7

Outdoor 56

1,230 1,120

L.C.D Wireless Liquid 1/4"(6.35) Gas 1/2"(12.7) 3/8"(9.52)

O O

Operation

A-Unit Only

A-Unit + B-Unit

B-Unit Only

Unit

Item

Cooling Capacity Btu/h(kcal/h) Moisture Removal ℓ/h Power Source ø, V, Hz

Air Circulation

m3/min

Noise Level dB(A)

Input W Runnig Current A E.E.R. Btu/h.w

Motor Output W

Dimensions(W x H x D)

Net. Weight kg

Refrigerant(R-22)(at 7.5m)

g Airflow Direction Control(Up & Down) Remocon Type

Service Valve

Sleeping Operation Drain Hose

LM-2320C2L/M

1. Indoor Unit

- 6 -

Dimensions

Installation plate

Right rear piping

Left rear piping

ø70mm

50mm

20mm

80mm

ø70mm

Center

ø70mm

Left rear piping Right rear piping

Tubing hole cover

W mm 802 888

H mm 262 287 D mm 165 170

B-Unit (9K)

A-Unit (14K)

MODEL

DIM

( 9K )

( 14K )

- 7 -

L10

Gas side 3-Way valve

Liquid side 2-Way valve

L7L5L6

2. Outdoor Unit

W mm 870 H mm 655 D mm 320 L1 mm 370 L2 mm 25 L3 mm 630 L4 mm 25 L5 mm 546 L6 mm 160 L7 mm 160 L8 mm 64 L9 mm 76.5 L10 mm 50

LM-2320C2L/M

MODEL

DIM

- 8 -

Refrigeration Cycle Diagram

LM-2320C2CL/M

Pipe Size (Diameter : inch)

Max.

piping length

(m)

Max.

piping elevation

(m)

Gas Liquid

3/8"(1/2") 1/4" 10~15 5~7

ex)

Capillary Cooling

A-UNIT B-UNIT

CAPILLARY TUBE

LIQUID SIDE

2-WAY VALVE

GAS SIDE

3-WAY VALVE

HEAT EXCHANGER (EVAPORATOR)

HEAT

EXCHANGER

(CONDENSER)

COMPRESSOR

3854A20023C

INDOOR WIRING DIAGRAM

CN-DISP1

CN-U/D

FUSE

AC250V/T2A

CN-TH1

SSR

SH-CAPA.

ZNR

THERMISTOR

FORCED OPERATION

AUTO RESTART

REMOTE CONTROL

STEP

MOTOR

MAIN PCB

ASM

DISPLAY PCB ASM

TO OUTDOOR UNIT

PILLAR TERMINAL

GN/YL

1(L) 2(N

)

RY-COMP.

CN-POWER CN-MOTOR

3854A20023D

INDOOR WIRING DIAGRAM

CN-DISP1

CN-U/D

FUSE

AC250V/T2A

CN-TH1

SSR

SH-CAPA.

CN-TAB1

ZNR

CN-MOTOR

THERMISTOR

FORCED OPERATION

AUTO RESTART

REMOTE CONTROL

STEP

MOTOR

MAIN PCB

ASM

DISPLAY PCB ASM

TO OUTDOOR UNIT

PILLAR TERMINAL

GN/YL

1(L) 2(N

)

RY-COMP.

TO INDOOR UNIT

3854AP7050H

MAIN

POWER

B-UNITA-UNIT

OUTDOOR WIRING DIAGRAM

1(L) 1(L)2(N) 1(L) 2(N)2(N)

CAPACITOR

O.L.P

T/B 4

T/B 1

T/B 3

T/B 2

MOTOR

POWER

RELAY

TERMINAL 8LOCK(10P)

COMP

GN/YL

CAPACITOR

- 9 -

Wiring Diagram(Indoor Unit & Outdoor Unit)

1. A-Unit(14K) (Indoor Unit) 2. B-Unit(9K) (Indoor Unit)

3. Outdoor Unit

Operation Details

1. MAIN UNIT FUNCTION

• DISPLAY

1) C/O Model Operation Indicator

• On while in appliance operation, off while in appliance pause

• Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on)

Sleep Timer Indicator

• On while in sleep timer mode, off when sleep timer cancel or appliance operation pause

Timer Indicator

• On while in timer mode (on/off), off when timer mode is completed or canceled.

Comp. Running Incidator

• While in appliance operation, on while in outdoor unit compressor running, off while in compressor off

■ Cooling Mode Operation

• When the intake air temperature reaches 0.5°C below the setting temp, the compressor and the outdoor fan stop.

• When it reaches 0.5°C above the setting temp, they start to operate again. Compressor ON Temp ➲ Setting Temp+0.5°C Compressor OFF Temp ➲ Setting Temp-0.5°C

• While in compressor running, operating with the airflow speed set by the remote control. While in compressor not running, operating with the low airflow speed regardless of the setting.

■ Healthy Dehumidification Mode

• When the dehumidification operation input by the remote control is received, the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature. 26°C ≤ Intake Air Temp ➲ 25°C 24°C ≤ Intake Intake Air Temp<26°C ➲ Intake Air Temp-1°C 18°C ≤ Intake Intake Air Temp<24°C ➲ Intake Air Temp-0.5°C Intake Air Temp<18°C ➲ 18°C

• While in compressor off, the indoor fan repeats low airflow speed and pause.

• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification

operation and 4-min compressor off repeat. Compressor ON Temp. ➲ Setting Temp+0.5°C Compressor OFF Temp. ➲ Setting Temp-0.5°C

• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.

■ Cooling overload

• Control indoor fan by sensing outdoor pipe temperature.

• One step down from setting fan speed if pipe temperature is oven 50°C and if below 45°C, operate on setting

temperature.

-10-

■ Fuzzy Operation (Cooling only Model)

• According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.

Compressor ON Temp ➲ Setting Temp + 0.5°C Compressor OFF Temp ➲ Setting Temp + 0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temp at that time.

26°C ≤ Intake Air Temp ➲ 25°C 24°C ≤ Intake Air Temp < 26°C ➲ Intake Air Temp + 1°C 22°C ≤ Intake Air Temp < 24°C ➲ Intake Air Temp + 0.5°C 18°C ≤ Intake Air Temp < 22°C ➲ Intake Air Temp Intake Air Temp<18°C ➲ 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule.

• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.

■ Airflow Speed Selection

• The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input of the airflow speed selection key on the remote control.

■ On-Timer Operation

• When the set time is reached after the time is input by the remote control, the appliance starts to operate.

• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.

• If the appliance is operating at the time set by the timer, the operation continues.

■ Off-Timer Operation

• When the set time is reached after the time is input by the remote control, the appliance stops operating.

• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.

• If the appliance is on pause at the time set by the timer, the pause continues.

■ Off-Timer <=> On-Timer Operation

• When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is carried out according to the set time.

■ Sleep Timer Operation

• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops.

• While the appliance is on pause, the sleep timer mode cannot be input.

• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature increases by 1°C. After another 30 min elapse, it increases by 1°C again.

• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to

the low.

• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to the medium.

-11-

-12-

■ Chaos Swing Mode

• By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are fixed to the desired direction.

• While in Chaos Swing mode, the angles of cooling and heating cycle operations are different.

■ Chaos Natural Wind Mode

• When the Chaos Natural Wind mode is selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec. randomly by the Chaos Simulation.

■ Jet Cool Mode Operation (Cooling only Model)

• If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates.

• In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min at cooling mode operation.

• In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C

• When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.

• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then

operated in order that the air outflow could reach further.

■ Auto Restarting Operation

• When the power is restored after a sudden power failure while in appliance operation, the mode before the power failure is kept on the memory and the appliance automatically operates in the mode on the memory.

• The slide switch on the main unit of the appliance should be on the Auto Restarting position in order that the Auto Restarting operation is available.

• Operation Mode that is kept on the memory

- State of Operation ON/OFF

- Operation Mode/Setting Temp/Selected Airflow Speed

- Sleep Timer Mode/Remaining Time of Sleep Timer (unit of hour)

• If no input by the remote control or no switching of the slide switch within 7 hr after the appliance operates by the Auto Restarting operation, the appliance is forced to stop at the moment of 7-hr elapse.

■ Forced Operation (Cooling only Model)

• To operate the appliance by force in case that the remote control is lost, the forced operation selection switch is on the main unit of the appliance to operate the appliance in the standard conditions.

• When the power is supplied while the slide switch is on the forced operation position, or when the slide switch position is switched to the Auto Restarting position (or test operation) or switched from the remote control position to the forced operation position while the power is on, the forced operation is carried out.

• When the slide switch position is switched from the forced operation position to the Auto Restarting position or the remote control position, the forced operation is canceled and the appliance stops operating.

• The forced operation is carried out in cooling mode with the setting temperature 22°C and the high speed of airflow.

• While in forced operation, the key input by the remote control has no effect and the buzzer sounds 10 times to indicate the forced operation.

FORCED OPERATION

AUTO RESTART

REMOTE CONTROL

-13-

■ Remote Control Operation Mode

• When the remote control is selected by the slide switch on the main unit, the appliance operates according to the input by the remote control.

■ Protection of the evaporator pipe from frosting

• If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cooling cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor evaporator pipe from frosting.

• When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor and the outdoor fan is turned on according to the condition of the room temperature.

■ Buzzer Sounding Operation

• When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.

• When the appliance-pause key is input by the remote control, the long "beep—" sounds.

• When a key is input by the remote control while the slide switch on the main unit of the appliance is on the

forced operation position, the error sound "beep-beep-beep-beep-beep-" is made 10 times to indicate that the remote control signal cannot be received.

Display Function

■ Cooling Model

• Cooling, Soft Dry, Fan

• Sleep Mode

• Timer Mode

Self-diagnosis Function

■ 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 as the following table.

• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.

• After error occurrence, if error is released, error LED is also released simultaneously.

• To operate again on the occurrence of error code 12, be sure to pull out power cord and then re-insert.

• Having or not of error code is different from Model.

Operation Indicator

Timer Indicator

Sleep Timer Indicator

Compressor on Indicator

-14-

OUT

DOOR

(once)

(twice)

(5times)

(once)

(twice)

(3times)

3sec 3sec

3sec

3sec 3sec

3sec

3sec 3sec

3sec

Error Code

Error LED

(Indoor body operation LED)

Error contents SVC check point

• Indoor suction temperature thermistor open/short.

• Indoor pipe temperature thermistor open/short.

• Indoor TH ass'y check

• Outdoor TH ass'y

check

• Resetting of remocon operating mode

• Communication line/circuit check

• Primarily check refrigerant pressure

• Connecting pipe check

• Connecting cable check

• Outdoor suction temperature

thermistor open/short.

• Outdoor pipe temperature thermistor open/short.

• Abnormal operation of multi product. (Simultanueous operation of cooling and heating)

• Misconnection of connecting cables

• Poor communication

- 15 -

Installation

Front

Right Rear right

Rear left

Down right

Left

More than 5 cm

More than eye-level

More than

5 cm

More than

5 cm

More than 10 cm

More than 70 cm

Indoor unit

Outdoor unit

1) Selection of the best location

1. Indoor unit

• There should not be any heat source or steam

near the unit.

• There should not be any obstacles to prevent the air circulation.

• A place where air circulation in the room will be good.

• A place where drainage can be easily obtained.

• A place where noise prevention is taken into

consideration.

• Do not install the unit near the door way.

• Ensure the spaces indicated by arrows from

the wall, ceiling, fence, or other obstacles.

2. Outdoor unit

• If an awning is built over the unit to prevent direct sunlight or rain exposure, be careful that heat radiation from the condenser is not restricted.

• There should not be any animals or plants which could be affected by hot air discharged.

• Ensure the spaces indicated by arrows from the wall, ceiling, fence, or other obstacles.

3. Piping length and the elevation

Pipe Size

GAS LIQUID

Max. piping

length

A (m)

Max.

Elevation

B (m)

1/2"(3/8") 1/4" 10~15 5~7

(1) Installation of Indoor, Outdoor unit

- 16 -

2) Indoor Unit Installation

The mounting wall should be strong and solid enough to protect it from the vibration.

1. Mount the installation plate on the wall with four Type "A" screws.

(If mounting the unit on the concrete wall, consider using anchor bolts.)

• Always mount the Installation plate horizontally

by aligning the marking-off line by means of the thread and a level.

2. Drill the piping hole with 70mm dia. holecore drill.

• Line according to the arrows marked on lower

the left and the rght side of the Installation Plate. The meeting point of the extended line is the center of the hole.

• Drill the piping hole at either the right or the left

and the hole should be slightly slant to the outdoor side.

Installation Plate

marking-off line

Thread

Weight

Type "A" screw

ø70mm ø70mm

5~7mm

ø70mm

50mm

20mm

80mm

Indoor Outdoor

Wall

Left rear piping Right rear piping

The lower left and the right side of Installation Plate

9K Btu

14K Btu

+ 36 hidden pages

LG LM-2320C2L/M Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual