DOWNLOAD 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 ↓ Size: 2.16 MB | Pages: 86 in PDF or view online for FREE

Model
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
Pages
86
Size
2.16 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
lt-b2861hl.zip
Date

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

3. The Indoor Unit Installation
• The following parts is optional.
Hanging Bolt    - W 3/8 or M10, length 650 mm
Nut                   - W 3/8 or M10
Spring Washer - M10
Plate Washer   - M10
• Drill the piping hole on the wall slightly tilted to
the outdoor side using a Ø 70 hole-core drill.
–25–
Wall
5~7mm
Indoor
Outdoor
Set screw of
paper model (4 pieces)
Paper model
for installation
Ceiling board
100mm
Adjust the same height
Ceiling board
Ceiling 
Flat washer for M10
(accessory)
Keep the length of the bolt
from the bracket to 40mm
Open the ceiling board
along the outer edge of the 
paper model
Flat washer for M10
(accessory)
Hanging bolt
(W3/8 or M10)
Nut
(W3/8 or M10)
Nut
(W3/8 or M10)
Spring washer
(M10)
Air Conditioner body
• Tighten the nut and bolt to prevent unit falling.
CAUTION
4. Remote Controller Installation
• Although the room temperature sensor is in the indoor unit, the remote control box should be installed in such
places away from direct sunlight and high humidity.
Installation of the remote control box
• Select places that are not splashed with water.
• Select control position after receiving customer approval.
• The room temperature sensor of the thermostat for temperature control is built in the indoor unit.
• This remote controller equipped with liquid crystal display. If this position is higher or lower, display is difficult
to see.(The standard height is 1.2 ~ 1.5m high)
Routing of the remote control cord
• Keep the remote control cord away from the refrigerant piping and the drain piping.
• To protect the remote control cord from electrical noise, place the cord at least 5cm away from other power
cables (audio equipment, television set, etc.)
• If the remote control cord is secured to a wall, provide a trap at the top of the cord to prevent water droplets
from running.
–26–
Remove the battery cover from the remote con-
troller.
• Slide the cover according to the arrow direction.
Insert the two batteries.
• Be sure that the (+) and (-) directions are correct.
• Be sure that both batteries are new.
Re-attach the cover.
• Slide it back into position.
• Fix the under plate on the wall
• Separate the under plate from Remote control box.
• Fix the cord clamps on the wall by
ø 3 tapping screws (accessory).
• Fix the remote control cord.
Remote control 
box body
Cord clamp
(accessory)
Lever carefully 
the box open 
using a screw 
driver, etc.
Front case
The lo
wer par
t
Face of wall
Under plate
Screw (accessory)
WIRED REMOTE CONTROL INSTALLATION
REMOTE CONTROL PREPARATION(OPTION)
DISASSEMBLING
ELECTRICAL WIRING
HOW TO MOUNT ONTO A WALL
HOW TO INSERT BATTERIES
• Do not use rechargeable bat-
teries, such batteries differ
from standard dr y cells in
shape, dimensions, and per-
formance.
• Romove the batteries from the
remote controller if the air con-
ditioner is not going to be used
for some long time.
 
Wire and make sure that teminal
numbers are matched on unit side and
remote controller side.
The maximum length of the cord is 100m.
If the length of the cord exceeds 50m,
use a wire size greater than 0.5mm
2
.
Remote controller
(Main board)
CN REMO
–27–
5. Wiring Connection
• Open the control box cover and connect the Remote control cord and Indoor power wires.
The power cord connected to the outdoor unit 
should be complied with the following specifications 
(Rubber insulation, type H05RN-F approved by HAR 
 or SAA).
The connecting cable connected to the indoor and 
outdoor unit should be complied with the following 
specifications (Rubber insulation, type H05RN-F 
approved by HAR or SAA).
CAUTION
8.5mm
20mm
GN/YL
NORMAL CROSS-SECTIONAL AREA
Capacity 1 Phase 3 Phase
36K BTU/h 5.5mm
2
2.5mm
2
24,28,30K
BTU/h
2.5mm
2
-
7.5mm
20mm
GN/YL
NORMAL
CROSS-SECTIONAL
AREA 0.75mm
Remote control
cord
Control 
box cover
Control box cover
fitting screw (4 units)
[Air inlet side view]
Wire taking inlet
Indoor Power wires
Terminal Block of Indoor Unit
3(N) 4(L)
5
6
7
S
R
T
3(N)
N
4(L)
5
6
7
8
Terminal Block of Outdoor Unit
Power Cord
Terminal Block of Indoor Unit
3(N) 4(L)
5
6
7
S
R
T
3(N)
N
4(L)
5
6
7
8
Terminal Block of Outdoor Unit
Power Cord
Terminal Block of Indoor Unit
3(N) 4(L)
5
6
7
1(N) 2(L)
3(N) 4(L)
5
6
7
8
Terminal Block of Outdoor Unit
Power Cord
Terminal Block of Indoor Unit
3(N) 4(L)
5
6
7
1(N) 2(L)
3(N) 4(L)
5
6
7
8
Terminal Block of Outdoor Unit
Power Cord
Make sure that the screws of the terminal are free from looseness.
WARNING
1 Phase
• Heat Pump Model
• Cooling Model
3 Phase
• Heat Pump Model
• Cooling Model
–28–
1. All wiring must comply with LOCAL REGULATIONS.
2. Select a power source that is capable of supplying the current required by the air conditioner.
3. Feed the power source to the unit via a distribution switch board designed for this purpose.
4. The terminal screws inside the control box may be loose due to vibration during transport. 
Check the screws for loose connection. 
(Running the air conditioner with loose connection can overload and damage electrical components.)
5. Always ground the air conditioner with a grounding wire and connector to meet the LOCAL REGULATION.
Main power source
(24K, 28K, 30K Btu)
(36K Btu)
Switch box
Refrigerant pipe
Circuit Breaker
Use circuit breaker or time delay fuse.
ELECTRICAL WIRING
GROUP CONTROL(OPTIONAL)
It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent
over current.
• Use Only One Wired Remote Controller with several
air conditioners (max. 16 Units).
• Sequential starting to prevent overcurrent.
• You can use a group control after connecting the
brown and yellow wire of each air-conditioner.
• You must remove the resistor "OP 7" in remote control.
Design
Features
Operation unit
ZONE
1 2 3 4
Humidify
JET
AUTO
AUTO SWING
OPERATION
FAN SPEED
Program set
SUB FUNCTION
SET TEMP
Room Temp
HI
MED
LO
Heater
Defrost
Filter
Preheat
Out door
Time
Timer
On
Set no. Time
Off
01
03
05
07
09
11
13
15
17
19
21
23
ID
#1
ID
#2
......
ID
#16
Yellow
Yellow
Red
Yellow
Brown
Wired Remote Controller
(Standard)
Brown
Brown
Page of 86
Display

Click on the first or last page to see other 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 manuals if exist.