LG LT-B2421CL / LT-B2421HL / LT-B2461CL / LT-B2461HL / LT-B2821CL / LT-B2821HL / LT-B2861CL / LT-B2861HL / LT-B3021CL / LT-B3021HL / LT-B3621CL / LT-B3621HL / LT-B3661CL / LT-B3661HL / LT-B3681CL / LT-B3681HL Service Manual ▷ View online
Ceiling Cassette
Air Conditioner
Air Conditioner
SERVICE MANUAL
MODELS: LT-B2461CL/LT-B2461HL
LT-B2861CL/LT-B2861HL
LT-B2421CL/LT-B2421HL
LT-B2821CL/LT-B2821HL
LT-B3021CL/LT-B3021HL
LT-B3681CL/LT-B3681HL
LT-B3621CL/LT-B3621HL
LT-B3661CL/LT-B3661HL
LT-B2421CL/LT-B2421HL
LT-B2821CL/LT-B2821HL
LT-B3021CL/LT-B3021HL
LT-B3681CL/LT-B3681HL
LT-B3621CL/LT-B3621HL
LT-B3661CL/LT-B3661HL
Contents
Functions
3
Product Specifications (Cooling & Heating)
5
Dimensions
8
Refrigeration Cycle Diagram
11
Wiring Diagram
13
Operation Details
19
Installation of Indoor, Outdoor Unit
22
Test Running
34
3-way Valve
36
Cycle Troubleshooting Guide
41
Electronic Parts Troubleshooting Guide
42
Electronic Control Device
46
Schematic Diagram
47
Exploded View and Replacement Parts List
49
–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
• 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 automatically previous operation
mode after power supply.
• The setting temperature and desired operation mode are automatically set by fuzzy rule.
• Both the indoor and outdoor fan stops during defrosting.
• Hot start after defrost ends.
• Hot start after defrost ends.
• The indoor fan stops until the evaporator piping temperature will be reached at 28°C.
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
Deice (Defrost) control (Heating)
Hot-start Control (Heating)
Auto Restart
–3–
–4–
Remote Controller
Operation ON/OFF
Operation Mode Selection
Fan Speed Selection
Room Temperature Display
Temperature Setting
Setting the Timer
Weekly Timer
(Cooling
model only)
(Heating
model only)
(Low)
(Med)
(High)
Cooling Operation Mode ( )
Heating Operation Mode ( )
Heating Operation Mode ( )
Auto Operation Mode ( )
Soft Dry Operation Mode ( )
Fan Operation Mode
HI
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
Up to 30°C
Down to 16°C
Up to 30°C
Up to 30°C
