LG LV-B2420CL User manual

Room Air Conditioner
(Convertible Type)
SERVICE MANUAL
MODEL: LV-B2420CL/ B2420HL
LV-B2421CL/ B2421HL
LV-B1820CL/ B1820HL
LV-B1821CL/ B1821HL

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...............................................................................................51
Electronic Parts Troubleshooting Guide.............................................................................52
Electronic control device......................................................................................................56
Schematic Diagram ...............................................................................................................57
Exploded View and Replacement Parts List.......................................................................58
–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(22˚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, 60Hz
Indoor 13.5 15
Outdoor 45 50
Input W 2,000 1,950 2,750 2,700
Running Current A 9.7 9.2 13 13
E.E.R. Btu/h-W 9 9 8.73 8.73
Indoor 1,200 x 205 x 615
Outdoor 870 x 655 x 320
Indoor 30
Outdoor 45 55 60 60
Refrigerant (R-22) g 1,330 1,040 1,800 1,050
Airflow Direction Control (Up & Down) O O O
Remocon Type L.C.D Wireless
Liquid 1/4" (6.35) 3/8" (9.52) 1/4" (6.35)
Gas 1/2" (12.7) 5/8" (15.88) 5/8" (15.88)
Sleeping Operation O O O
Drain Hose O O O
Connecting Wire 0.75mm2
Main Power Cable 1.5mm22.5mm2
2.0mm2:for the Middle East)
Time Delay Safety Function O
Air Circulation O
Soft Dry O
Fan Speed (Indoor) 3 (Hi, Med, Low)
Timer 24Hrs
Self-Diagnosis O
Auto-Restart O
Air Circulation m3/min
Dimensions
(W HD)
Net. Weight
mm
kg
LV-B1820CL LV-B1821CL LV-B2420CL LV-B2421CL
–5–
Service Valve &
Connecting Tube

Product Specifications (Cooling & Heating)
–6–
Model Name
Item Unit
Cooling Capacity Btu/h(kcal/h) 18,000(4,536) 24,000(6,048)
Heating Capacity Btu/h(kcal/h) 18,000(4,536) 24,000(6,048)
Moisture Removal /h 2.5 3.5
Power Source
ø , V, Hz
1ø, 220, 60Hz
Indoor 13.5 15
Outdoor 45 50
Input Cooling 1,950 1,750 2,750 2,600
Heating 1,900 1,750 2,750 2,500
Running Current Cooling 9 8 13 12.5
Heating 8.8 8 13 11.5
E.E.R.(Cooling) Btu/h-W 9.23 9.34 8.73 9.23
C.O.P.(Heating) w/w 2.78 2.92 2.56 2.81
Indoor 1,200 x 205 x 615
Outdoor 870 x 655 x 320
Indoor 30
Outdoor 60 62
Refrigerant (R-22) g 1,480 1,140 1,800 1,400
Airflow Direction Control (Up & Down) O O
Remocon Type L.C.D Wireless
Liquid 1/4" (6.35) 3/8"(9.52) 1/4"(6.35)
Gas 1/2" (12.7) 5/8"(15.88)
Sleeping Operation O O
Drain Hose O O
Connecting Wire 0.75mm2
Main Power Cable 1.5mm22.5mm2
2.0mm2:for the Middle East)
Time Delay Safety Function O
Air Circulation O
Soft Dry O
Fan Speed (Indoor) 3 (Hi, Med, Low)
Timer 24Hrs
Self-Diagnosis O
Auto-Restart O
Air Circulation m3/min
W
A
Dimensions
(W HD)
Net. Weight
mm
kg
LV-B1820HL LV-B1821HL LV-B2420HL LV-B2421HL
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-B1820CL/HL, LV-B1821CL/HL, LV-B2420CL/HL, LV-B2421CL/HL

Refrigeration Cycle Diagram
• LV-B1820CL
• LV-B1821CL
• LV-B2420CL
• LV-B2421CL
Pipe size(Diameter: ) Piping length(m) Elevation(m)
MODEL
Gas Liquid Rated Max Rated Max
LV-B1820CL 1/2" 1/4" 5 15 5 8
LV-B1821CL 1/2" 1/4" 5 15 5 8
LV-B2420CL 5/8" 3/8" 5 20 5 8
LV-B2421CL 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–
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

• LV-B1820HL
• LV-B1821HL
• LV-B2420HL
• LV-B2421HL
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-B1820HL 1/2" 1/4" 5 15 5 8
LV-B1821HL 1/2" 1/4" 5 15 5 8
LV-B2420HL 5/8" 3/8" 5 20 5 8
LV-B2421HL 5/8" 1/4" 5 20 5 8