LG LT-D5480HL User manual

Ceiling Cassette
Air Conditioner
SERVICE MANUAL
MODELS: LT-D5480HL
LT-D5480HA
LT-D5480CL
LT-D5480CA

Contents
Functions .................................................................................................................................3
Product Specifications (Cooling & Heating)..........................................................................5
Dimensions ..............................................................................................................................6
Refrigeration Cycle Diagram ..................................................................................................8
Wiring Diagram ......................................................................................................................10
Operation Details ...................................................................................................................11
Installation of Indoor, Outdoor Unit .....................................................................................14
Cycle........................................................................................................................................30
Cycle Troubleshooting Guide ...............................................................................................33
Electronic Parts Troubleshooting Guide .............................................................................34
Electronic Control Device .....................................................................................................37
Schematic Diagram ...............................................................................................................38
Exploded View and Replacement Parts List .......................................................................39
–2–

–3–
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
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 because of smaller size
than textile. ( 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 wrinkle(type) and washable and anti-bacteria filter
is adopted.
Plasma Air Purifying Filter(2HL Only)
High head Drain pump • Built-in drain pump automatically drains water.
• A standard drain-head height of up to 700mm is possible.
High-Ceiling corresponding Function • According to the height of ceiling, the RPM of indoor fan
motor is selected 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 be
connected.
• It operates maximum 16 units by only one wired remote con-
troller and each unit starts sequentially 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 logic.
• 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
13,608(15,826) 13,608(15,826) 13,608(15,826) 13,608(15,826)
54,000 54,000 54,000 54,000
13,608(15,826) 13,608(15,826) - -
54,000 54,000 - -
5,600 5,600 5,600 5,600
4,850 4,850 - -
9.5 9.5 9.5 9.5
8.4 8.4 - -
79 79 79 79
79 79 - -
2.43 2.43 2.43 2.43
3.26 3.26 - -
36 36 36 36
58 58 58 58
5.8 5.8 5.8 5.8
OO OO
OO XX
44 44
OO OO
OO OO
OO OO
OO OO
OO OO
44 44
OO OO
OO XX
OO OO
OO OO
OO OO
OO OO
Option Option Option Option
OO OO
OX OX
5,800 5,800 5,700 5,700
840*840*288 840*840*288 840*840*288 840*840*288
950*950*30 950*950*30 950*950*30 950*950*30
900*1,225*370 900*1,225*370 900*1,225*370 900*1,225*370
32 32 32 32
95 95 95 95
12 : 4*3.5 12 : 4*3.5 12 : 4*3.5 12 : 4*3.5
16 : 5*1.25 16 : 5*1.25 16 : 5*1.25 16 : 5*1.25
1/2(12.7) 1/2(12.7) 1/2(12.7) 1/2(12.7)
3/4(19.05) 3/4(19.05) 3/4(19.05) 3/4(19.05)
50 50 50 50
30 30 30 30
FoamPE/5mm FoamPE/5mm FoamPE/5mm FoamPE/5mm
Ø25 / 32 Ø25 / 32 Ø25 / 32 Ø25 / 32
LT-D5480HA LT-D5480HL LT-D5480CA LT-D5480CL
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 / 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 (mm)
Gas Inch (mm)
Installation Pipe Length (m)
Elevation (m)
Insulation(material/thickness)
Drain Hose(I.D/O.D) mm
Product Specifications (Cooling & Heating)
–5–

Dimensions
–6–
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

–7–
(2) Outdoor Unit(54K)
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
54K Models

Refrigeration Cycle Diagram
• HEAT PUMP (LT-D5480HL, LT-D5480HA)
•Rated performance for refrigerant line length of: 7.5m
•If 54K Capacity is installed at a distance of 15m, 450g of refrigerant
should be added ....................................................(15-7.5) x 60g
–8–
INDOOR UNIT OUTDOOR UNIT
HEAT
EXCHANGER HEAT
EXCHANGER
COMPRESSOR
GAS SIDE
LIQUID SIDE
COOLING
HEATING
REVERSING
VALVE
CAPILLARY TUBE
Capacity
54K 3/4" 1/2" 7. 550
GAS LIQUID
530 60
Elevation (m)
Length (m) * Additional
refrigerant
(g/m)
Pipe Size
(Diameter:ø)
Rated RatedMax. Max.

–9–
• COOLING ONLY(LT-D5480CL, LT-D5480CA)
•Rated performance for refrigerant line length of: 7.5m
•If 54K Capacity is installed at a distance of 15m, 450g of refrigerant
should be added ....................................................(15-7.5) x 60g
INDOOR UNIT OUTDOOR UNIT
HEAT
EXCHANGER
(CONDENSER)
HEAT
EXCHANGER
(CONDENSER)
COMPRESSOR
GAS SIDE
LIQUID SIDE
CAPILLARY TUBE
Capacity
54K 3/4" 1/2"
7. 550
GAS LIQUID
530 60
Elevation (m)
Length (m) * Additional
refrigerant
(g/m)
Pipe Size
Rated Rated
Max. Max.

–10–
Wiring Diagram
(1) Capacity: 54K(3ø) - LT-D5480HL, LT-D5480HA, LT-D5480CL, LT-D5480CA
<HEAT PUMP>
<COOLING ONLY>
OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM
INDOOR
MOTOR DRAIN
PUMP STEP MOTOR
TEMP.
THERMISTOR
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN -DISP
DISPLAY PCB
ONLY LT-D xxx2HL
AIR
CLEANER
H.V. ASSY
DOOR S/W
TERMINAL
BLOCK
TO OUTDOOR UNIT
3854A20072G3854A20072H
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BK
BL
GN
/
YL
COMP
RD
BK
WH
RD
BK
1 2 3 4 5
FUSE T3.15A
4 WAY
RTM
POWER SUPPLY
STN
BK
BK BKWH
WH WH
RD
OR
BK
63H2
WH
D.P CTH
TNS NO NC
WH
OR
BK 52F1
52C 1
2
3
4
5
6
31
T/B1
T/B2
32
B
A
FMo
49FMo FMo 49FMo
YL BK
OR
BK
T3 T2 T1
RD
WH
CM
12
34
56
78
YL BK
OR
BK
BK
BL
BL
BK WH
Co Co
20SV
GN/YL TMo
To the indoor unit
1(L)
2(N)
3
4
5
BK
WHWH YL
BK
RD
F1
F1
OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM
INDOOR
MOTOR DRAIN
PUMP STEP MOTOR
TEMP.
THERMISTOR
PIPE
THERMISTOR
REMOTE
CONTROL
FLOAT S/W
CN -DISP
DISPLAY PCB
ONLY LT-D xxx2CL
AIR
CLEANER
H.V. ASSY
DOOR S/W
TERMINAL
BLOCK
TO OUTDOOR UNIT
3854A20072P3854A20072Z
BR
YL
BK
OR
BL
BL
BR
GN/YL
RD
BL
GN
/
YL
COMP
BK
RD
WH
RD
BK
1 2 3 4 5
FUSE T3.15A
GN/YL TMo
To the indoor unit
2(N)
1(L)
3
4
5
F1
F1
RTM
POWER SUPPLY
STN
BK
BK
WH
RD
WH WH
52C 1
2
3
4
5
6
31
32
B
A
FMo
49FMo FMo 49FMo
BK
T3 T2 T1
RD
WH BK
BL
WH
WH
CM
YL BK
OR
Co Co
YL
OR BK
BR
BK
OR
OR
BR