LG LT-D3680CL User manual

Ceiling Cassette
Air Conditioner
SERVICE MANUAL
MODELS: LT-D3680CL/LT-D3680HL
LT-D3682HL
LT-D4820CL/LT-D4820HL
LT-D4880CL/LT-D4880HL
LT-D4822HL
Библиотека СОК 

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 AUTOMEDLO
Program Holiday
SET/CLR
MinHour
Week
Timer CancelTimer Cancel
: High:39°C ↔LOW:11°C
: Fan Operates without cooling & heating
Cooling Heating
Down to 18°C
Up to 30°CDown to 16°C Up to 30°C

Model
3, 380-415, 50 3, 380-415, 50 3, 380-415, 50 3, 380-415, 50 3, 380-415, 50 3, 380-415, 50
9,073(10,550) 9,073(10,550) 9,073(10,550) 12,096(14,065) 12,096(14,065) 12,096(14,065)
36,000 36,000 36,000 48,000 48,000 48,000
- 9,073(10,550) 9,073(10,550) - 12,096(14,065) 12,096(14,065)
- 36,000 36,000 - 48,000 48,000
4,000 4,000 4,000 4,900 4,900 4,900
- 3,500 3,500 - 4,400 4,400
7.5 7.5 7.5 8.5 8.5 8.5
- 6.5 6.5 - 8 8
50 50 50 55 55 55
- 48 48 - 55 55
2.27 2.27 2.27 2.3 2.3 2.3
- 3.0 3.0 - 2.93 2.93
25 25 25 30 30 30
58 58 58 58 58 58
4.0 4.0 4.0 5.3 5.3 5.3
OOOOOO
XO O X O O
444444
OOOOOO
OOOOOO
OOOOOO
OOOOOO
OOOOOO
444444
OOOOOO
XO O X O O
OOOOOO
OOOOOO
OOOOOO
OOOOOO
Option Option Option Option Option Option
OOOOOO
XX O X X O
2,900 2,900 2,900 4,300 4,250 4,250
840*840*288 840*840*288 840*840*288 840*840*288 840*840*288 840*840*288
950*950*30 950*950*30 950*950*30 950*950*30 950*950*30 950*950*30
790*965*320 790*965*320 790*965*320 900*1225*370 900*1225*370 900*1225*370
32 32 32 32 32 32
78 78 78 95 95 95
14 : 4*2.5 14 : 4*2.5 14 : 4*2.5 12 : 4*3.5 12 : 4*3.5 12 : 4*3.5
18 : 4*0.75 18 : 5*0.75 18 : 5*0.75 16 : 4*1.25 16 : 5*1.25 16 : 5*1.25
3/8(9.52) 3/8(9.52) 3/8(9.52) 3/8(9.52) 3/8(9.52) 3/8(9.52)
5/8(15.88) 5/8(15.88) 5/8(15.88) 3/4(19.05) 3/4(19.05) 3/4(19.05)
50 50 50 50 50 50
30 30 30 30 30 30
FoamPE/5mm FoamPE/5mm FoamPE/5mm FoamPE/5mm FoamPE/5mm FoamPE/5mm
Ø25 / 32 Ø25 / 32 Ø25 / 32 Ø25 / 32 Ø25 / 32 Ø25 / 32
LT-D3680CL LT-D3680HL LT-D3682HL LT-D4880CL LT-D4880HL LT-D4882HL
Power Supply ø, V, Hz
Capacity Cooling kcal/h(W)
Btu/h
Heating kcal/h(W)
Btu/h
Input Cooling W
Heating W
Running Current Cooling A
Heating A
Starting Current Cooling A
Heating A
E.E.R kcal/h(W)
C.O.P W/W
Air Circulation Indoor m3/min
Outdoor m3/min
Moisture Removal l/ h
Air-Flow Direction Control
Heating Operation Mode
Fan Speeds (steps)
Auto Operation (Changeover)
Forced Operation
Jet Cool
Soft Dry Operation
Timer Delay Safety Function
Feature Air Deflection (Way)
Self Diagnosis
Hot start
Auto Restart
Air refresh (Hole)
High Ceiling
Group Control (Optional wiring)
Central Control
Wired remote controller (with weekly Program)
Plasma A/Cleaner
Refrigerant(R-22) Charge g
Dimensions Indoor mm
(W x D x H) Panel mm
Outdoor mm
Net Weight Indoor kg
Outdoor kg
Main Power Cord AWG#:P*mm2
Connection Cable AWG#:P*mm2
Service Valve Liquid (inch)
Gas (inch)
Installation Pipe Length (m)
Elevation (m)
Insulation(material/thickness)
Drain Hose(I.D/O.D) mm
Product Specifications (Cooling & Heating)
–5–

–6–
Power Supply ø, V, Hz
Capacity Cooling kcal/h(W)
Btu/h
Heating kcal/h(W)
Btu/h
Input Cooling W
Heating W
Running Current Cooling A
Heating A
Starting Current Cooling A
Heating A
E.E.R kcal/h(W)
C.O.P W/W
Air Circulation Indoor m3/min
Outdoor m3/min
Moisture Removal l/ h
Air-Flow Direction Control
Heating Operation Mode
Fan Speeds (steps)
Auto Operation (Changeover)
Forced Operation
Jet Cool
Soft Dry Operation
Timer Delay Safety Function
Feature Air Deflection (Way)
Self Diagnosis
Hot start
Auto Restart
Air refresh (Hole)
High Ceiling
Group Control (Optional wiring)
Central Control
Wired remote controller (with weekly Program)
Plasma A/Cleaner
Refrigerant(R-22) Charge g
Dimensions Indoor mm
(W x D x H) Panel mm
Outdoor mm
Net Weight Indoor kg
Outdoor kg
Main Power Cord AWG#:P*mm2
Connection Cable AWG#:P*mm2
Service Valve Liquid (inch)
Gas (inch)
Installation Pipe Length (m)
Elevation (m)
Insulation(material/thickness)
Drain Hose(I.D/O.D) mm
1, 220, 60 1, 220, 60
12,096(14,065) 12,096(14,065)
48,000 48,000
- 12,096(14,065)
- 48,000
5,000 5,000
- 4,500
24 24
- 22.5
55 55
-55
2.3 2.3
- 2.93
30 30
58 58
5.3 5.3
OO
XO
44
OO
OO
OO
OO
OO
44
OO
XO
OO
OO
OO
OO
Option Option
OO
XX
4,300 4,300
840*840*288 840*840*288
950*950*30 950*950*30
900*1225*370 900*1225*370
32 32
95 95
10 : 3*6.0 10 : 3*6.0
16 : 4*1.25 16 : 5*1.25
3/8(9.52) 3/8(9.52)
3/4(19.05) 3/4(19.05)
50 50
30 30
FoamPE/5mm FoamPE/5mm
Ø25 / 32 Ø25 / 32
Model LT-D4820CL LT-D4820HL

Dimensions
–7–
290
950
950
950
950
290
210.5
180
52
140
40
110
30
90 90
110
55
840
785
840
678
(1) Indoor Unit

(2) Outdoor Unit(36K)
–8–
L6L7 L8 L9
L4
H
L11
L10
L5
W
D
L1
L2
L3
Gas side
3-way valve
Liquid side
3-way valve
MODEL
DIM
W mm 790
H mm 965
D mm 320
L1 mm 358
L2 mm 19
L3 mm 339
L4 mm 920
L5 mm 38
L6 mm 503
L7 mm 144
L8 mm 143
L9 mm 73
L10 mm 93
L11 mm 80
36K Models

–9–
(3) Outdoor Unit(48K)
L6L7 L8 L9
L4
H
L11
L10
L5
W
D
L1
L2
L3
Gas side
3-way valve
Liquid side
3-way valve
MODEL
DIM
W mm 900
H mm 1,225
D mm 370
L1 mm 460
L2 mm 45
L3 mm 410
L4 mm 1,135
L5 mm 90
L6 mm 550
L7 mm 175
L8 mm 175
L9 mm 112
L10 mm 120
L11 mm 83
48K Models

Refrigeration Cycle Diagram
• HEAT PUMP (LT-D3680HL, LT-D3682HL, LT-D4880HL, LT-D4882HL, LT-D4820HL)
•Rated performance for refrigerant line length of: 7.5m
•If 48K Capacity is installed at a distance of 15m, 450g of refrigerant
should be added ....................................................(15-7.5) x 60g
–10–
INDOOR UNIT OUTDOOR UNIT
HEAT
EXCHANGER HEAT
EXCHANGER
COMPRESSOR
GAS SIDE
LIQUID SIDE
COOLING
HEATING
REVERSING
VALVE
CAPILLARY TUBE
Capacity
36K 5/8" 3/8" 7. 550
48K 3/4" 3/8"
7. 550
GAS LIQUID
530 50
530 60
Elevation (m)
Length (m) * Additional
refrigerant
(g/m)
Pipe Size
(Diameter:ø)
Rated RatedMax. Max.