LG LV-B2461CL, LV-B2461HL, LV-B1861HL, LV-B1861CL, LV-2461HL Service Manual

Room Air Conditioner

(Convertible Type)

SERVICE MANUAL

MODEL: LV-B2461CL/ 2461HL

LV-B1861CL/ 1861HL

Contents

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

Product Specifications (Cooling Only)..................................................................................5

Product Specifications (Cooling & Heating).........................................................................6

Dimensions..............................................................................................................................7

Refrigeration Cycle Diagram..................................................................................................9

Wiring Diagram......................................................................................................................11

Operation Details ..................................................................................................................13

Display Function ...................................................................................................................21

Self-diagnosis Function........................................................................................................21

Installation .............................................................................................................................22

Operation ...............................................................................................................................39

Disassembly of the parts (Indoor Unit) ...............................................................................41

2-way, 3-way Valve.................................................................................................................45

Cycle Troubleshooting Guide...............................................................................................52

Electronic Parts Troubleshooting Guide.............................................................................53

Electronic control device......................................................................................................57

Schematic Diagram...............................................................................................................58

Exploded View and Replacement Parts List.......................................................................59

–2–

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 Deice Mode or Hot Start Mode (only Heating Model)

--- Lights up during compressor running
(only Cooling Model)

•Intermittent operation of fan at low speed.

•The fan is switched to low(Cooling), med(Heating) 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, right and left (not on all models) automatically.

•The setting temperature, indoor fan speed and desired

operation made are automatically set by fuzzy rule.

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)

Soft Dry Operation Mode

•Both the indoor and outdoor fan

stops during deicing.

•Hot start after deice ends.

•The indoor fan stops until the

evaporator piping temperature
will be reached at 28°C.

Deice (defrost) control (Heating)

Hot-start Control (Heating)

Sleep Mode Auto Control

Natural Air Control by CHAOS Logic

Airflow Direction Control

Auto Operation

–3–

–4–

Soft Dry Operation Mode.( )

Remote Controller

Operation ON/OFF

Reset

Operation Mode Selection

Fan Speed Selection

Room Temperature Display

Temperature Setting

Setting the Time or Timer

Timer Selection

Timer Setting

Timer Cancel

Sleep Operation

Airflow Direction Control

(Cooling

model only)

(Heating

model only)

TEMPERATURE

LOW HIGH

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

Cooling Operation Mode.( )

Heating Operation Mode.( )

Auto Operation Mode.( )

Fan Operation Mode

ON OFF

SET

CANCEL

: High:39°C ↔ LOW:11°C

: OFF, ON, OFF ↔ ON

: Cancel Sleep Mode, Timer ON or Timer OFF.

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

: Fan Operates without cooling. (Cooling model only)

Cooling Heating

Down to 18°C

Up to 30°C,

Down to 16°C

Up to 30°C,

Product Specifications (Cooling Only)

Model Name

Item Unit

Cooling Capacity Btu/h(kcal/h) 18,000(4,536) 24,000(6,048)

Moisture Removal ℓ/h 2.5 3.5

Power Source

ø

, V, Hz

1ø, 220-240V, 50Hz

Indoor 14.0 16.0

Outdoor 50 50

Input W 1,935 2,500

Running Current A 9.0 11.9

E.E.R. Btu/h-W 9.3 9.6

Indoor 1,200 x 205 x 615

Outdoor 870 x 655 x 320

Indoor 30

Outdoor 57 57

Refrigerant (R-22) g 880 1,550

Airflow Direction Control (Up & Down) 󱇩󱇩

Remocon Type L.C.D Wireless

Liquid 1/4" (6.35) 1/4" (6.35)

Gas 1/2" (12.7) 5/8" (15.88)

Sleeping Operation 󱇩󱇩
Drain Hose 󱇩󱇩

Connecting Wire 0.75mm

2

󱈉

Main Power Cable 1.5mm

2

󱈉 2.5mm2󱈉

(2.0mm

2

:for the Middle East)

Time Delay Safety Function 󱇩
Air Circulation 󱇩
Soft Dry 󱇩

Fan Speed (Indoor) 3 (Hi, Med, Low)

Timer 24Hrs

Self-Diagnosis 󱇩
Auto-Restart 󱇩

Air Circulation m3/min

Dimensions

(W×H×D)

Net. Weight

mm

kg

LV-B1861CL LV-B2461CL

–5–

Service Valve &
Connecting Tube

Product Specifications (Cooling & Heating)

–6–

Model Name

Item Unit

Cooling Capacity Btu/h(kcal/h) 19,000(4,788) 24,000(6,048)

Heating Capacity Btu/h(kcal/h) 20,000(5,040) 24,000(6,048)

Moisture Removal ℓ/h 2.5 3.5

Power Source

ø

, V, Hz

1

ø

, 220-240V~, 50Hz

Indoor 14.5 16

Outdoor 45 50

Input Cooling 1,950 2,670

Heating 1,860 2,570

Running Current Cooling 8.9 12.3

Heating 8.5 11.9

E.E.R.(Cooling) Btu/h-W 9.74 8.98

C.O.P.(Heating) w/w 3.15 2.73

Indoor 1,200 x 205 x 615

Outdoor 870 x 655 x 320

Indoor 30

Outdoor 58 58

Refrigerant (R-22) g 1,310 1,390

Airflow Direction Control (Up & Down) 󱇩󱇩

Remocon Type L.C.D Wireless

Liquid 1/4" (6.35) 1/4" (6.35)

Gas 1/2" (12.7) 5/8"(15.88)

Sleeping Operation 󱇩󱇩
Drain Hose 󱇩󱇩

Connecting Wire 0.75mm

2

󱈉

Main Power Cable 1.5mm

2

󱈉 2.5mm2󱈉

(2.0mm

2

:for the Middle East)

Time Delay Safety Function 󱇩
Air Circulation 󱇩
Soft Dry 󱇩

Fan Speed (Indoor) 3 (Hi, Med, Low)

Timer 24Hrs

Self-Diagnosis 󱇩
Auto-Restart 󱇩

Air Circulation m3/min

W

A

Dimensions

(W×H×D)

Net. Weight

mm

kg

LV-B1861HL

LV-B2461HL

Service Valve &
Connecting Tube

Dimensions

(1) Indoor Unit

250mm

36mm

36mm

1076mm

1200mm

205mm

615mm

392mm

265mm

468mm

R

63mm

38mm

175mm

(Installation Plate)

(Rear Side)

–7–

(2) Outdoor Unit

Gas side
3-way valve

Liquid side
3-way valve

W

L6L7 L8 L9

L4

L11

L10

D

L1

L2

L5

L3

MODEL

DIM

W mm 870

H mm 655

D mm 320

L1 mm 370

L2 mm 25

L3 mm 340

L4 mm 630

L5 mm 25

L6 mm 546

L7 mm 162

L8 mm 162

L9 mm 54

L10 mm 74.5

L11 mm 79

–8–

LV-B1861CL/HL
LV-B2461CL/HL

Refrigeration Cycle Diagram

• LV-B1861CL

• LV-B2491CL

For installation over rated distance, 30g of refrigerant should be added for each meter.

ex) When installed at a distance of 15m, 300g of refrigerant should be added.

(15-5) x 30g = 300g

Pipe size(Diameter:󱇅) Piping length(m) Elevation(m)

MODEL

Gas Liquid Rated Max Rated Max

LV-B1861CL 1/2" 1/4" 5 15 5 8

LV-B2461CL 5/8" 1/4" 5 20 5 8

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGER
(EVAPORATOR)

HEAT
EXCHANGER
(CONDENSER)

COMPRESSOR

GAS SIDE

LIQUID SIDE

CAPILLARY TUBE

–9–

• LV-B1861HL

• LV-B2461HL

For installation over rated distance, 30g of refrigerant should be added for each meter.

ex) When installed at a distance of 15m, 300g of refrigerant should be added.

(15-5) x 30g = 300g

–10–

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGER

HEAT
EXCHANGER

COMPRESSOR

GAS SIDE

LIQUID SIDE

CAPILLARY TUBE

COOLING

HEATING

REVERSING
VALVE

CHECK VALVE

CAPILLARY TUBE

Pipe size(Diameter:󱇅) Piping length(m) Elevation(m)

MODEL

Gas Liquid Rated Max Rated Max

LV-B1861HL 1/2" 1/4" 5 15 5 8

LV-B2461HL 5/8" 1/4" 5 20 5 8

Wiring Diagram

(1) Indoor Unit

–11–

(INDOOR)

DISPLAY PCB

ASSY.

MAIN PCB

ASSY.

TRANS­FORMER

THERMISTOR

CN-TH

CN-TRANS

CN-FAN

RY-L

OR
RD
BL

BL

BL

BR

BK

MOTOR

CAPACITOR

BR YL

GN/YL

GN/YL

FUSE

T3.15A

STEP

MOTOR

RY-COMP

CN-4WAY

RY

RD

BK

WH

CN-UP/DOWN 1,2

POWER

INPUT

GN/YL

CN-DISP

DOOR S/W 1,2

3

RY-M
RY-H

TERMINAL

BLOCK

1

(L) 2(N)

3456 78

CONVERTIBLE(HEAT PUMP)

STEP

MOTOR

TO OUTDOOR UNIT

TO OUTDOOR UNIT

(INDOOR)

DISPLAY PCB

ASSY.

MAIN PCB

ASSY.

TRANS­FORMER

THERMISTOR

CN-TH

CN-TRANS

CN-FAN

RY-L

OR
RD
BL

BL

BK

MOTOR

CAPACITOR

BR YL

GN/YL

GN/YL

GN/YL

FUSE

T3.15A

STEP

MOTOR

RY-COMP

CN-4WAY

CN-UP/DOWN 1,2

POWER

INPUT

BR

BL

WH

CN-DISP

DOOR S/W 1,2

4

3

RY-M
RY-H

TERMINAL

BLOCK

1

(L) 2(N)

34

CONVERTIBLE(COOLING ONLY)

STEP

MOTOR

1. LV-B1861CL/2461CL

2. LV-B1861HL/2461HL

(2) Outdoor Unit

1. LV-B1861CL/2461CL

2. LV-B2461HL

3. LV-B1861HL

–12–

CONVERTIBLE(HEAT PUMP) (OUTDOOR)

CONVERTIBLE(COOLING ONLY) (OUTDOOR)

COMP.

BL

RD

GN/YL

GN/YL

GN/YL

BKBK

L3 L2 L1

CAPACITOR

REVERSING

VALVE

THERMISTOR

CAPACITOR

FAN

MOTOR

R

C

S

TO INDOOR UNIT

34567

TERMINAL

BLOCK

HIGH PRESSURE S/W(FOR HEATING)

BK

BK

BKBK

WH

BR

BL

BK

BK

YL

BR(OR)

YL

CONVERTIBLE(HEAT PUMP) (OUTDOOR)

COMP.

BL

RD

GN/YL

GN/YL

GN/YL

BKBK

L3 L2 L1

CAPACITOR

REVERSING

COIL

THERMISTOR

CAPACITOR

FAN

MOTOR

R

C

S

TO INDOOR UNIT

34567

TERMINAL

BLOCK

HIGH PRESSURE S/W(FOR HEATING)

BK

BK

BKBK

WH

BR

BL

BK

BK

YL

BR(OR)

YL

TO INDOOR UNIT

COMP.

CAPACITOR

FAN

MOTOR

R

S

C

H

F

C

34

TERMINAL

BLOCK

BL

RD

BR

BRBL

BK

T/B

BR(OR)

GN/YL

YL

T/B

Operation Details

(1) The function of main control

1. Time Delay Safety Control

• 3min…The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.

(Protection of compressor)

• 5sec…Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind.

• 30sec… The 4-way valve is ceased for 30sec. to prevent the refrigerant-gas abnormal noise when the Heating

operation is OFF or switched to the other operation mode while compress is off.

While compressor is running, it takes 3~5 seconds to switch.

2. Airflow Direction Control

• This function is to swing the louver up and down automatically and to set it at the desired position.

• The procedure is as the following.

1st ; Press the ON/OFF Button to operate the product.
2nd ; Press the Airflow Direction Control Button to swing the louver up and down automatically.
3nd ; Repress the Airflow Direction Control Button to set the louver as the desired position.

MODE 0

1

2

3

4

5

6

7

135°

Cooling

MODE

MODE

MODE

MODE

MODE

MODE

MODE

9

MODE

(CLOSE)

OPEN

135°

12°

Cooling

HeatingHeating

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

MODE 8

MODE 9

CLOSE

OPEN

135°

12°

Cooling

HeatingHeating

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

MODE 8

MODE 9

CLOSE

–13–

※ For Heating Model

• Airflow direction control figure when installed on

the floor.

• Airflow direction control figure when installed

under the ceiling.

3. Cooling Mode Operation

• When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote

controller and the operation diagram is as following

4. Cooling or Heating Mode with Sleep Mode Auto Operation

• When selecting the Cooling( ) or the Heating( ) combined with the Sleep Mode Auto Operation( ), the
operation diagram is as following.

■ Cooling Mode with the Sleep Mode

• The setting temperature will be raised by 1°C 30minutes later and by 2°C 1 hour later.

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

■ Heating Mode with the Sleep Mode.

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

Intake Air temp.

COMP. ON
(SET TEMP.+0.5°C)

COMP. OFF
(SET TEMP. -0.5°C) More than More than

3 minutes 3 minutes

INDOOR FAN Low Low Low Low Low

COMPRESSOR ON OFF ON OFF ON

30 minutes 30 minutes

1°C

1°C

–14–

Setting Temp. +3°C
(Compressor OFF)

Setting Temp.
(Compressor ON)

Indoor Fan Med. Med. Med. Med. Med. Med.

Compressor ON OFF ON OFF ON OFF

Intake Air temp.

COMP. ON
(SET TEMP.+0.5°C)

COMP. OFF
(SET TEMP. -0.5°C) More than More than

3 minutes 3 minutes

Selecting Selecting Selecting

fan speed fan speed fan speed

COMPRESSOR ON OFF ON OFF ON

INDOOR FAN Low Low

5. Auto Operation

• The operation procedure is as following. (Cooling & Heating Model)

* If initial mode is decided, that mode is continued without the room temperature changing.
* For cooling operation mode over 24°C setting temperature and fan speed are same as cooling only model.

• Auto Operation for Cooling. (Cooling only Model)

–15–

Press Start/Stop Button

Select Auto Operation Mode

Check the Room temperature

Operation mode

Indoor fan speed are automatically decided by Fuzzy rule.

Setting temperature

Intake-air

temperature

Operation Mode Heating Soft Dry Cooling

Operation Condition Intake-air Temperature Setting temperature Fan speed Air Direction Control

Over 26°C25°C

Over 24°C~below 26°C Intake air -1°C

Over 22°C~below 24°C Intake air -0.5°C

Over 20°C~below 22°C intake air temperture

below 20°C20°C

Over 20°C~below 30°C Fuzzy control

below 20°C20°C

over 30°C30°C

below 21°C

below

24°C

~

Over 24°C

Over
21°C

When Auto Operation

initial start

When pressing room temp-

erature setting button

during Auto Operation

Controlled

by Fuzzy logic

In this mode, when
pressing the verti­cal air diretion con­trol.
Button, louvers
moves to 1/f
rhythm (refer to
page 17)

Intake-Air temp

Setting Temp. +0.5°C
(Compressor OFF)

Setting Temp.-0.5°C
(Compressor ON)

Indoor Fan

Compressor

ON ONOFF OFF

Fuzzy Speed

• Auto Operation for Soft Dry

The Setting temperature will be same as that of the current intake-air temperature.

- Compressor ON temperature; Setting temperature +1°C

- Compressor OFF temperature; Setting temperature -0.5°C

• Auto Operation for Heating.

- Compressor ON temperature; Setting temperature

- Compressor OFF temperature; Setting temperature +3°C

• 1/f rhythm louver operation : In Auto operation mode, when pressing the vertical air direction control button, lou-

ver moves as following cycle.

–16–

Intake Air temp. below 20°C over 20℃~below 21°C

Setting temp. 20°C Intake air temp. +0.5°C

21.5°C

20°C

20°C

Intake-Air temp.

Setting temp.

20.5°C

21°C

MODE0

MODE1

MODE2

MODE3

MODE4

MODE5

MODE6

MODE9

(CLOSED)

End

Start

6. Natural wind by CHAOS logic

–17–

For more fresh feeling than other fan speed mode, press
the indoor fan Speed Selector and set to CHAOS mode.
In this mode, the wind blows like natural breeze by auto­matically changing fan speed according to the CHAOS
logic.

Intake Air temp.

OUTDOOR FAN/COMP.

INDOOR FAN

: Setting fan speed : LOW

Cooling on temp.

(Setting temp.+0.5)

Setting CHAOS Natural wind

Setting temp.

Cooling off temp.

(Setting temp.-0.5)

: CHAOS Natural wind

: COMP ON : COMP OFF

GRAPH of Natural wind by the CHAOS logis (During Cooling operation)

Intake Air temp.

30sec

OUTDOOR FAN/COMP.

INDOOR FAN

: Setting fan speed : LOW

Heating off temp.

(Setting temp.+3.0)

Setting CHAOS Natural wind

Heating on temp.

(Setting temp.)

: CHAOS Natural wind

: COMP ON : COMP OFF

GRAPH of Natural wind by the CHAOS logis (During Heating operation)

LOW OR STOP

–18–

7. Heating Mode Operation

The unit will operate according to the setting by the remote controller and the operation diagram is shown as
following.

• For Heating Model

INDOOR FAN

4-WAY VALVE

ON

ON

ON

OFF

OFF

OFF

OFF

ON

ON

ON

ON

26°C

28°C

Indoor piping temp.

Intake Air temp.

Setting temp. +3.0˚C

(Compressor OFF)

Setting temp.

(Compressor ON)

minimum

1min.

minimum

3min.

Fan

Stops

Low
Fan

Low Fan Low Fan Fan StopSelected Fan

Selected

Fan

Low
Fan

Selected

Fan

minimum

3min.

minimum

30sec.

minimum

1min.

OUTDOOR FAN

COMPRESSOR

8. Hot-Start Control

• The indoor fan stops until the evaporator piping temperature will be reached to 28℃.

• During heating operation, if piping temperatures falls below 26°C fan stops.

• The operation diagram is as following.

PIPING
TEMPERATURE

1min

COMPRESSOR

INDOOR FAN

ON

26°C

: Selected Fan : Low Fan : Fan Stop

28°C

–19–

9. Deice Control ❋ ( ); LV-B2461HL

• Deicing operation is controlled by timer and sensing the outdoor piping temperature.

• The first deicing starts only when the outdoor pipe temperature falls below -6°C after 45(30) minutes passed

from starting of heating operation.

• Deicing ends after 10(6) minutes passed from starting of deice operation or when the outdoor pipe temperature
rises over 12°C even if before 10(6) minutes.

• The second deicing starts only when the outdoor pipe temperture falls below -6°C after 45(30) minutes passed
from ending of the first deicing.

More than 45(30) minutes

of heating operation

Within

10(6) minutes

DeicingDeicing

ON OFF

ON ON

ON

ON OFF OFF

COMPRESSOR

4-WAY VALVE

INDOOR FAN

-6°C

DEICE ON

12°C

DEICE OFF

The outdoor

piping Temp.

ON

More than 45(30) minutes

of heating operation

HOT-

START

ON

OFF

ON

INDOOR FAN

Low Fan Low Fan

Intake Air temp.

Setting temp. +1.0˚C

(Compressor ON)

Setting temp. -0.5˚C

(Compressor OFF)

Setting temp.

2min.58sec. 2min.58sec.

10min. 10min.7min.

Within 7min.

CoolingCooling

OUTDOOR FAN

COMPRESSOR

Selected

Fan

Selected

Fan

ON

ON

ON

ON

OFF

OFF

OFF

OFF

ON

ON

OFF

OFF

ON

ON

OFF

OFFONON

OFF

OFF

10. Soft Dry Operation

• During Soft Dry Operation, the compressor ON temperature is the setting temperature plus 1°C, the compressor
OFF temperature is the setting temperature minus 0.5°C.

• When the room temperature rises over the compressor ON temperature, the operation mode is switched to the
cooling mode.

• When the room temperature falls between the compressor ON temperature and OFF temperature, the operation
mode is switched to the Soft Dry Operation.
In this temperature range, 10min. Dry Operation, 7min operation OFF. During 10min Dry operation, if the room
temperature falls below compressor OFF temperature, Compressor OFF.

• In micom dehumidify mode, control of fan speed is as following.

12. Protection of the evaporator pipe from frosting

If the temperature of the indoor coil is below 0°C after 7 minutes from starting the compressor, the

compressor and the outdoor fan is stopped, and then after 3 minute delay of the compressor and
the temperature of the indoor coil is over 7°C, the compressor and the outdoor fan is reoperated.
Indoor fan operates at low speed (comp. OFF) or at selected speed (comp. ON)

13. Inlet grille open

Once the inlet grille is opened during operation of the unit, the unit automatically stops operation and the
lamps will be turned-off. But memorized functions are still available.
When the inlet grille is closed again, the unit become waiting state for operation. From then, the unit can be
operated by forced operation button or Start/Stop button of remote controller.

14. Test Operation

• When pressing forced operation switch about 3 seconds, the unit operates in cooling mode at high speed fan
regardless of room temperature and resets in 18 min.

• During test operation, if remote controller signal is received, the unit operates as remote controller sets.

15. 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 should be on the automatically operates in the mode
on the memory.

• 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 controller 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.

–20–

11. Forced operation

• If you lose wireless remote controller, you can operate the unit with forced operation switch.

• The standard conditions are as following.

• Unit operates in low fan mode for first 15 seconds, then switched to proper operation mode according to

intake Air temperature.

Heat pump Model

Room Temp≥ 24

°C

21°C〈Room Temp≤24

°C

Room Temp 〈21

°C

Operation Mode Cooling Cooling Soft Dry Heating

FAN Speed High High Soft Dry Rule High

Setting Temp. 24°C22°C Air Intake Temperature 24°C

Cooling Model

R

Forced
Operation Button

Press the Forced Operation Button.

•Press the Forced Operation Button once
again to stop operation.