LT-D3680CL, LT-D3680HL, LT-D3682HL, LT-D4820CL, LT-D4820HL, LT-D4822HL, LT-D4880CL, LT-D4880HL — LG Air Conditioner Service Manual (repair manual)

Model
LT-D3680CL LT-D3680HL LT-D3682HL LT-D4820CL LT-D4820HL LT-D4822HL LT-D4880CL LT-D4880HL
Pages
55
Size
1.77 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
lt-d3680hl.zip
Date

View LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL Service Manual online

Ceiling Cassette
Air Conditioner
SERVICE MANUAL
MODELS: LT-D3680CL/LT-D3680HL
LT-D3682HL
LT-D4820CL/LT-D4820HL
LT-D4880CL/LT-D4880HL
LT-D4822HL
Contents
Functions  .................................................................................................................................3
Product Specifications (Cooling & Heating) ..........................................................................5
Dimensions  ..............................................................................................................................7
Refrigeration Cycle Diagram  ................................................................................................10
Wiring Diagram  ......................................................................................................................12
Operation Details ...................................................................................................................15
Installation of Indoor, Outdoor Unit  .....................................................................................18
3-way Valve  ............................................................................................................................34
Cycle Troubleshooting Guide ...............................................................................................39
Electronic Parts Troubleshooting Guide  .............................................................................40
Electronic Control Device  .....................................................................................................43
Schematic Diagram  ...............................................................................................................44
Exploded View and Replacement Parts List  .......................................................................45
–2–
Functions
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
Soft Dry Operation Mode
Airflow Direction Control
Auto Operation(Auto Change Over)
Deice (defrost) control (Heating)
Auto Restart
–3–
Hot-start Control (Heating)
• The indoor fan stops until the evaporator piping tempera-
ture will be reached at 28°C.
Compact and light design
• To install a unit is very convenient size because of smaller
than fextile size. ( 600 x 600 )
Low noise
• The most advanced low-noise design.
• The adoption of turbo fan and round type heat exchanger
give the quietest operation.
Long life filter
• Long life type(wrinkle) and wastable and anti-bacteria filter
is adopted.
Plasma Air Purifying Filter(2HL Only)
High head height Drain pump
• Built-in drain pump automatically drains water.
• A standard drain-head height of up to 700mm is possible.
High-Ceilingcorresponding Function
• According to the height of ceiling, the RPM of indoor fan
motor is selectable to increase air reaching distance.
Central Control(Optional)
• It is operating individually or totally by central control function.
Group Control(Optional Wiring)
• Each controller can control 16 units and 8 controllers can connect.
• It operates maximum 16 units by only one wired remote con-
troller and each unit starts random to prevent overcurrent.
• 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.
• Jet, High, Med, Low
• Intermittent operation of fan at low speed.
• The louver can be set at swing up and down automatically.
• Although the air-conditioner is turned off by a power failure, it is restarted automati-
cally previous operation mode after power supply.
• The setting temperature and desired operation mode are auto-
matically set by fuzzy rule.
• Both the indoor and outdoor fan stops during defrosting.
• Hot start after defrost ends.
–4–
Remote Controller
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Room Temperature Display
Temperature Setting
Setting the Timer 
Weekly Program
(Cooling 
model only)
(Heating 
model only)
(Low)
(Med)
(High)
Cooling Operation Mode (       )
Heating Operation Mode (       )
Auto Operation Mode (       )
Soft Dry Operation Mode (       )
Fan Operation Mode
HI
JET
AUTO
MED
LO
Program
Holiday
SET/CLR
Min
Hour
Week
Timer
Cancel
Timer
Cancel
: High:39°C 
LOW:11°C
: Fan Operates without cooling & heating
Cooling
Heating 
Down to 18°C
Up to 30°C
Down to 16°C
Up to 30°C
–18–
Installation of Indoor, 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 con-
sideration.
• Do not install the unit near the door way.
• Ensure the spaces indicated by arrows from the
wall, ceiling, or other obstacles.
• The indoor unit must keep the maintenance
space.
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
Indoor unit
Outdoor unit
B
A
More than
30cm
Fence or
obstacles
More than 70cm
More than 50cm
More than
More than
30cm
More than
30cm
Sunr
oof
Unit:cm
Ceiling
Ceiling Board
Ceiling Board
30 or more
Abo
ve
 250
400 or less
100 
or more
50 or 
more
50 or 
more
30 or less
Floor
CAPACITY
36K Btu/h
5/8"
3/8"
7.5
50
48K Btu/h
3/4"
3/8"
7.5
50
GAS
LIQUID
5
30
50
5
30
60
Elevation B (m)
Length A (m)
* Additional
refrigerant
(g/m)
Pipe Size
Rated
Rated
Max.
Max.
• Rated performance for refrigerant line length of: 7.5m
• If 48K Model is installed at a distance of 15m, 450g of refrigerant should be added
(15-7.5) x 60g

Download LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL Service Manual (Repair Manual)

Here you can view online or download LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL Air Conditioner. Information contained in LG LT-D3680CL / LT-D3680HL / LT-D3682HL / LT-D4820CL / LT-D4820HL / LT-D4822HL / LT-D4880CL / LT-D4880HL service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).