Floor Standing Type
Air Conditioner
SERVICE MANUAL
MODEL: LF300CP(LP-C303R20)
LF480CE(LP-C483TA0)
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Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
I Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
I Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
I Installation
Do not use a defective or
underrated circuit breaker. Use
this appliance on a dedicated
circuit.
Always ground the product.
Install the panel and the cover
of control box securely.
• There is risk of fire or electric
shock.
• There is risk of fire or electric
shock.
• There is risk of fire or electric
shock.
Always install a dedicated
circuit and breaker.
Use the correctly rated
breaker or fuse.
Do not modify or extend the
power cable.
• Improper wiring or installation may • There is risk of fire or electric
cause fire or electric shock shock.
• There is risk of fire or electric
shock.
–3–
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Do not install, remove, or re-
install the unit by yourself
(customer).
Be cautious when unpacking
and installing the product.
For installation, always
contact the dealer or an
Authorized Service Center.
• There is risk of fire, electric shock, • Sharp edges could cause injury.
• There is risk of fire, electric shock,
explosion, or injury.
explosion, or injury.
Be especially careful of the case
edges and the fins on the
condenser and evaporator.
Do not install the product on a Be sure the installation area
Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.
defective installation stand.
does not deteriorate with age.
• It may cause injury, accident, or
damage to the product.
• If the base collapses, the air
conditioner could fall with it,
causing property damage, product
failure, and personal injury.
• Moisture may condense and wet or
damage furniture.
I Operational
Do not touch(operate) the
product with wet hands.
Do not place a heater or other
appliances near the power
cable.
Do not let electric parts of the
product get wet.
• There is risk of fire or electrical
shock.
• There is risk of fire or electric
shock.
• There is risk of fire, failure of the
product, or electric shock.
–4–
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Do not store or use flammable gas or
combustibles near the product.
If strange sounds, or small or smoke comes
from product. Turn the breaker off or
disconnect the power supply cable.
• There is risk of fire or failure of product.
• There is risk of electric shock or fire.
G a s o l i n
Do not open the inlet grill of the product during Be cautious that water could not enter the
operation. (Do not touch the electrostatic filter,
if the unit is so equipped.)
product.
• There is risk of physical injury, electric shock, or
product failure.
• There is risk of fire, electric shock, or product damage.
I Installation
Always check for gas (refrigerant) leakage after Install the drain hose to ensure that water is
installation or repair of product.
drained away properly.
• Low refrigerant levels may cause failure of product.
• A bad connection may cause water leakage.
–5–
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Keep level even when installing the product.
Use two or more people to lift and transport
the product.
• To avoid vibration or water leakage.
• Avoid personal injury.
90˚
I Operational
Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.
Do not touch the metal parts of the product
when removing the air filter. They are very
sharp!
• There is risk of fire, electric shock, or damage to the
plastic parts of the product.
• There is risk of personal injury.
Do not step on or put anyting on the product.
(outdoor units)
Do not insert hands or other objects through
the air inlet or outlet while the product is
operated.
• There is risk of personal injury and failure of product.
• There are sharp and moving parts that could cause
personal injury.
–6–
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Functions
Indoor Unit
Power Switch ON/OFF
Operation Mode Control
• Cooling, Heating, Soft Dry, Fan
Indoor Fan Speed Control
• High, Med & Low
Room Temperature control
• Maintains the room temperature in accordance with the Setting Temp.
• Up: up to 30°C(86.0°F)
• Down: down to 16°C(60.8°F)
Sensing Heat Exchanger Temperature
• Heat exchanger temperature sensor (Thermistor)
Soft Dry Operation Mode
• Intermittent operation of fan at low speed.
Time Delay Safety Control
• Restarting is inhibited for approx. 3 minutes.
AutoRestart
• The power comes on again after a power failure.
–7–
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Remote Control
Operation ON/OFF
Cooling Operation Mode
Heating Operation Mode
Sot Dry Operation Mode
• Intermittent operation of fan at low speed.
Fan Operation
• Used to circulate room air without cooling.
Timer Control
• OFF Timer (1, 2, 3,......7 hour)
Airflow Direction Control
• Airflow direction Auto-swing and Manual Contol.
Room Temperature Control
• Up: up to 30°C(86.0°F)
• Down: down to 16°C(60.8°F)
Indoor Fan speed control
• High, Med & Low
–8–
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Outdoor Unit
Deice Control
(Heating Model Only)
• De-ice PCB
Outdoor Fan Speed Control
• One speed
Sensing Heat Exchanger Temperature
• Heat exchanger temperature sensor (Thermistor)
–9–
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Product Specifications
MODEL
LF300CP(LP-C303R20)
LF480CE(LP-C483TA0)
POWER SOURCE (ø, V, Hz)
1, 208/230, 60
1, 208/230, 60
COOLING
CAPACITY
BTU/h
28,000
48,000
W
W
8,206
14,067
INPUT
2,600
4,500
CURRENT
CAPACITY
A
11.5
20
HEATING
BTU/h
W
-
-
-
-
INPUT
W
-
-
CURRENT
A
-
LG
-
MAKER
LG
TYPE
Rotary
Rotary
COMPRESSOR
MODEL
QJ250KAB/QK145KBD
17,658/10,100
7.7/4.5
QP325KBD * 2
CAPACITY
BTU/h
A
24000
CURRENT
INPUT
10.2
W
1,635/935
2162
NOISE
LEVEL(1m)
AIR
INDOOR
OUTDOOR
INDOOR
OUTDOOR
50/45/39/32
57/54/51
62
dB(A)
56
20/16.5/13/6 (706/583/459/212)
47 (1,660)
35/33/30(1,236/1,165/1,059)
104(3,672)
CMM
(CFM)
VOLUME
REFRIGERANT R-22
kg(Oz)
R/C/FPI
1.84 (65)
3.92(124.2)
HEAT
EXCHANGER
FAN
INDOOR
2R/30C/18FPI
2R/36C/20FPI
TURBO FAN
Propeller
3R/28C/18FPI
2R/26C/21FPI
TURBO FAN
OUTDOOR R/C/FPI
INDOOR
TYPE
OUTDOOR
Propeller
ROOM TEMPERATURE CONTROL
Thermistor
Thermistor
NET
INDOOR
OUTDOOR
INDOOR
OUTDOOR
INDOOR
OUTDOOR
LIQUID
32(70.5)
58(127.9)
kg(lbs)
kg(lbs)
WEIGHT
66(145.5)
90(198.4)
Gross Weight
38(83.8)
66(145.5)
71(156.5)
100(220.5)
DIMENSIONS
(W ¥ H ¥ D)
SVC
570 x 1,820x 310 (22.45 x 71.7 x 12.2)
870 x 808 x 320 (34.3 x 31.8 x 12.6)
9.52(3/8)
590 x 1,810 x 440 (23.23 x 71.26 x 17.32)
900 x 1,225 x 370 (35.43 x 48.23 x 14.57)
9.52(3/8)
mm
(Inch)
mm
(Inch)
VALVE
GAS
POWER CABLE
15.88(5/8)
3x4.0
19.05(3/4)
3x5.5
P*mm2
P*mm2
A
CONNECTING CABLE
BREAKER CAPACITY
4x1.0
30
4x1.0
40
–10–
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Dimensions
Indoor Unit: LPNC303R20 (LF300CP)
Top/Bottom Airflow Controller
Left/Right Airflow Controller
Cool air outlet(2 sides) by
Manual operation
Cool air outlet(front side)
Top/Bottom Airflow Controller
Left/Right Airflow Controller
Sliding Clean Door
Control Panel
Remote Controller Holder
Display Panel
Antibiotic Filter
Plasma Deodorant Air Cleaner
Air Inlet
Antibiotic Filter
Air Inlet
Outdoor Unit : LPUC303R20 (LF300CP)
Control Cover
Air Inlet(back side)
Air Outlet
Bottom Panel
Ground Terminal
Refrigerant Pipe Port
–11–
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Indoor Unit
570mm(22.4inch)
311mm(12.2inch)
No.
1
2
Items
Control Display
Air outlet vent
Air inlet vent
3
Outdoor Unit
546mm(21.5inch)
320mm(12.6inch)
870mm(34.3inch)
3
5
1
2
4
No.
1
2
Items
Gas side service valve (Ø 15.88mm(5/8inch))
Liquid side service valve (Ø 9.52mm(3/8inch))
Fan cover
3
4
Earth screw
5
Connecting cable hole
–12–
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Indoor Unit : LPNC483TA0 (LF480CE)
Air Outlet Vent
Remote Signal
Receptor
Air Intake Vent
door Unit : LPUC483TA0 (LF480CE)
Air Intake Vent
(Rear)
Air Outlet
Vent
Piping
–13–
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Indoor Unit
486mm(19.1inch)
439mm(17.3inch)
1
3
2
40mm(1.6inch)
590mm(23.2inch)
41mm(1.6inch)
338mm(13.3inch)
No.
1
Items
Air Outlet Vent
Air Inlet Vent
Control display
2
3
370mm(14.6inch)
Outdoor Unit
125mm(4.9inch)
90mm(3.5inch)
460mm(18.1inch)
460mm(18.1inch)
640mm(25.2inch)
900mm(35.4inch)
130mm(5.1inch)
No.
1
Items
Air Outlet Vent
2
Liquid Side SVC Valve(Ø 9.52mm(3/8inch))
Gas Side SVC Valve(Ø 19.05mm(3/4inch))
Control Box
3
4
5
Earth Screw
–14–
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Wiring Diagram
1. LF300CP(LP-C303R20)
Outdoor
–15–
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2. LF480CE(LP-C483TA0)
Outdoor
–16–
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Operation Details
1. Time Delay Safety Control
3min
The compressor is ceased for 3 minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)
3sec
The indoor fan is ceased for 3 seconds to prevent relay noise.
(Protection of fan relay and micro chip)
30sec The 4-way valve is ceased for 30 sec. to prevent the refrigerant-gas abnormal noise when the Heating
operation is OFF or switched to the other operation mode.
2. Airflow Direction Control
This function is to swing the louver left and right automatically and to set it at the desired position.
The procedure is as the following.
1st : Press the ON/OFF Button to operate the product.
2nd : Press the Airflow Direction Control Button to swing the louver left and right automatically.
(Remote controller)
3rd : Repress the Airflow Direction Control Button to set the louver as the desired position.
(Remote controller)
3. Cooling Mode Operation
When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the
controller and the operation diagram is as following.
Intake Air temp.
Setting Temp. +1°C(1.8°F)
(Compressor ON)
Setting Temp. -1°C(1.8°F)
(Compressor OFF)
More than
3 minutes
More than
3 minutes
Selecting
fan speed
Selecting
fan speed
Selecting
fan speed
Selecting
fan speed
Selecting
fan speed
Indoor Fan Speed
Compressor
ON
OFF
ON
OFF
ON
4. Off Timer Function
This function is to set the time of stopping the unit operation.
The procedure is as the following.
1st: Press the timer set button on the Remocon.
....
2nd: The buzzer sounds and then the display window shows the Off-Time to be set as
- The Off-Time is shifted as the following by each press.
- If you select ' ', the Off-Timer function will be cancelled.
- During Off-Timer Operation, if you repress the timer set button, the rest time will be displayed.
–17–
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5. Heating Mode Operation
The unit will operate according to the setting by the remote controller and the operation diagram is shown as
following.
Intake Air Temp.
Setting Temp. +1°C(1.8°F)
(Compressor OFF)
A
A
Setting Temp.
(Compressor ON)
Setting Temp. -1°C(1.8°F)
minimum
10sec.
minimum
10sec.
minimum
10sec.
Hot
Start
minimum
10sec.
Selecting
fan speed
Selecting
fan speed
Indoor Fan Speed
Compressor
OFF
LOW
OFF
LOW
OFF
ON
OFF
ON
OFF
• A point: The indoor pipe temperature to be less then 35°C(95.0°F) & Discharge air Temperature to be less than 29°C(84.2°F).
The indoor fan operates for minimum 10sec. even if falls lower than 34°C(93.2°F).
During heating operation, the operating procedure of the indoor fan is as the following.
Stop(VI)
Low(V)
Selecting Fan Speed(IV)
39°C(102.2°F)
Discharge Air Temp.
34°C(93.2°F)
(Hot-Start Release Point)
28°C(82.4°F)
26°C(78.8°F)
Indoor Pipe Temp.
Heating Start
Stop(I)
(Hot-Start Operating)
Low(II)
Selecting Fan Speed(III)
Step
Indoor fan speed
Pipe temp.
Air discharge temp.
Off
Low
28 C(82.4°F)(Hot start operating)
28 C(82.4°F)
< 39°C(102.2°F)
≥ 39°C(102.2°F)
> 34°C(93.2°F)
≤ 34°C(93.2°F)
Selecting speed
Selecting speed
Low
28 C(82.4°F)
28 C(82.4°F)
26 C(78.8°F)
Off
26 C(78.8°F)
–18–
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6. Hot-Start Control
• The indoor fan stops until the evaporator piping temperature will be reached to 28°C(82.4°F).
• During heating operation, if piping temperatures fall below 26°C(78.8°F) fan stops.
• The operation diagram is as following.
Maximum
1min
INDOOR PIPE
TEMP.
28°C(82.4°F)
26°C(78.8°F)
INDOOR FAN
SPEED
Selecting
fan speed
OFF
LOW
OFF
COMPRESSOR
ON
7. Defrost Control
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -6°C(21.2°F) after 45 minutes passed
from starting of heating operation and more than.
• Defrost ends after 10 minutes pass from starting of defrost operation or when the outdoor pipe temperature rises
over 12°C(53.6°F) even if before 10 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below -6°C(21.2°F) after 45 minutes pass
from ending of the first defrost and more than.
More than 45 minutes of
heating operation
Within
More than 45 minutes of
heating operation
10 minutes
Defrost
Outdoor Pipe Temp.
Defrost
12°C(53.6°F)
(Defrost OFF)
-6°C(21.2°F)
(Defrost ON)
HOT-
START
Indoor Fan
Compressor
4-Way Valve
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
OFF
ON
OFF
–19–
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8. Soft Dry Operation Mode
• During Soft Dry Operation, the compressor ON temperature is the setting temperature plus 2°C(3.6°F), the
compressor OFF temperature is the setting temperature minus 1°C(1.8°F).
• When the room temperature rises over the compressor ON temperature, the operation mode is switched to the
Cooling mode.
• When the room temperature falls between the compressor ON temperature and OFF temperature, the operation
mode is switched to the Soft Dry Operation.
• The operation diagram is shown below.
Operation
Cooling
Cooling
operation
Intake Air Temp.
Dry operation
Setting Temp. +2°C(3.6°F)
(Compressor ON)
Setting Temp. -1°C(1.8°F)
maximum
7 min.
maximum
10 min.
3 min.
10 min.
3 min.
(Compresso OFF)
Selecting
fan speed
Selecting
fan speed
Indoor Fan Speed
Compressor
LOW
OFF
LOW
ON
LOW
OFF
LOW
OFF
LOW
ON
LOW
OFF
ON
ON
9. Protection of the evaporator pipe from frosting
• Compressor and outdoor fan stop when indoor pipe temperature is below -2°C(28.4°F) and restart at the pipe
temperature is above 12°C(53.6°F).
10. Air Purifying Operation(AP-Z286RC0, AP-Z286R20, AP-Z488TC0)
Outdoor
OFF
OFF
Operating Mode
Mode Selecting
Fan Speed
Initial Starting of
Air purifying
Operation
- Low at the initial
- But could be
switched to Med. Hi
- Outdoor not operating
- Fan operating + Air
purifying operating
Repress Air
purifying
Button or
ON/OFF
Button
ON or OFF
depend on main
operating
When switched to
Air purifying
operation
Selecting Speed of
Main Operating Mode
- Outdoor operating
- Main Operating +
Air purifying operating
condition.
11. Child Lock function
This function is to operate Air conditioner only by Remocon.
The procedure is as the following
1st: Press the 2 buttons of the temperature control simultaneously, to raise-to lower on the Display Panel of the
product for more 3 seconds.
2nd: The buzzer sounds and then the window of Display Panel shows CL (CL) mark.
3rd: To release this function, the reverse again the operating procedure could be done.
❈ During this function is operating, any buttons of Display Panel don't work. But it is possible to operate with
Remote controller.
–20–
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12. Alarm mode display / only displayed while operating.
CO : The sensor for sensing room temperature is open or short.
C1 : The sensor for sensing piping temperature is open or short.
13. Energy Saving
➀ If setting temperature of starting energy saving operation is under 22°C(71.6°F), first, setting temperature it
up to 22°C(71.6°F) and perform energy saving operation.
➁ After energy saving operation starts, if adaptation time of the human body pass from the point which room
temperature and setting temperature meet together, increase setting temperature 1°C(1.8°F) more.
➂ If it doesn't satisfy number ➀ even in 50 minutes from the start of energy saving operation, increase
1°C(1.8°F).
➃ After increasing setting temperature 1°C(1.8°F) more by number ➀, ➁, perform number ➁, ➂ again, if setting
temperature goes up to 25°C(77.0°F), maintain this temperature.
➄ If setting temperature goes down to under 25°C(77.0°F), during the operation, do number ➁, ➂, ➃ again.
27°C(80.6°F)
26°C(78.8°F)
25˚C(77.0°F)
24°C(75.2°F)
23°C(73.4°F)
22°C(71.6°F)
21°C(69.8°F)
28min.
50min.
35min.
50min.
47min.
50min.
Setting energy
saving operation
Setting temp.
23°C(73.4°F)
Setting temp.
24°C(75.2°F)
Setting temp. maintains setting temp.
25°C(77.0°F) 25°C(77.0°F)
14. AUTO RESTART
In case the power comes on again after a power failure, Auto Restarting Operation is the function to operate
procedures automatically to the previous operating conditions.
15. Function of changing set temperature when re-operation after stop.
Operation is set the following condition when re-operation with start/stop button.
1.Operation mode.
Cooling/soft dry mode
Cooling mode
Heating mode Heating mode
2. Setting the set temperature when cooling operation.
Room temperature > Set temperature: to be set to the previous set temperature.
Room temperature ≤ Set temperature
a) Room temperature ≥ 26°C(78.8°F): to be set to 24°C(75.2°F)
b) 22°C(71.6°F) ≤ Room temperature ≤ 25°C(77.0°F): to be set to 21°C(69.8°F)
c) 19°C(66.2°F) ≤ Room temperature ≤ 21°C(69.8°F): to be set to -1°C(1.8°F) less than room temperature.
d) Room temperature ≤ 18°C(64.4°F): to be set to 18°C(64.4°F)
–21–
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3. Setting the set temperature when heating operation.
Room temperature < Set temperature: to be set to the previous set temperature.
Room temperature ≥ Set temperature
a) Room temperature ≤ 20°C(68.0°F)(: to be set to 23°C(73.4°F)
b) 21°C(69.8°F) ≤ Room temperature ≤ 25°C(77.0°F): to be set to 26°C(78.8°F)
c) 26°C(78.8°F) ≤ Room temperature ≤ 28°C: to be set to +1°C more than room temperature.
d) 29°C(84.2°F) ≤ Room temperature : to be set to 30°C(86.0°F)
16. Function for test operation
1) Outline of Operation
- This is for checking the condition of installation during the installation, and it is operated by cooling, Fan speed
is high, comp. on, and Auto air flow operations without setting temperature.
2) Operation or Cancel
- Do test operation, if you push ON/OFF button and the down room temperature checking button over 3
seconds at the same time.
- During the operation, if you push the stop button or push ON/OFF button and the down room temperature
checking button over 3 seconds at the same time, the test operation will be cancelled and unit come to rest.
- During the operation, if you input remocon key or key on Display panel, it performs its duties.
3) Function
- It operates cooling, fan speed is high, auto air flow operation, comp. on for 18 1 minutes, regardless of room
temperature.
- After 18 1 minutes of operation, it becomes off itself.
- During the operation, signal 88 stands for "Lo"
–22–
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Installation of Indoor, Outdoor Unit
1. Selection of the best location
50mm(2inch)
1) Indoor unit
• There should not be any heat source or steam
near the unit.
400mm
(16inch)
400mm
(16inch)
• There should not be any obstacles to prevent the
air circulation.
• A place where air circulation in the room will be
good.
Indoor unit
• A place where drainage can be easily obtained.
• A place where noise prevention is taken into
consideration.
• Do not install the unit near the door way.
• Ensure the spaces indicated by arrows from the
wall, ceiling, fence, or other obstacles.
500mm(20inch)
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.
500mm (20inch)
• There should not be any animals or plants which
could be affected by discharged hot air.
• Ensure the space indicated by arrows from the
500mm(20inch)
wall, ceiling, fence, or other obstacles.
1000mm(39.4inch)
3) Piping length and the elevation
Cooling Only Model
Indoor unit
PIPE SIZE
Max.
Length Elevation
A (m/ft) B (m/ft)
Max.
MODEL
(BTU/h)
A
GAS SIDE LIQUID SIDE
Outdoor unit
B
48k
30k
3/4"
5/8"
3/8"
3/8"
40/131
30/98
25/82
20/66
–23–
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2. Indoor Unit installation
3. Outdoor unit Installation
The mounting floor should be strong and solid
enough to prevent it from vibration.
Install the outdoor unit on the concrete or any
solid base securely and horizontally by securing
it with bolts (Ø12mm(0.5inch)) and nuts.
Drill the piping hole with 2.8 inch diameter hole-
core drill at either the right or the left of indoor
unit. The hole should be sightly slant to the
outdoor side.
If there is any vibration transmitted to the
building, mount the rubber underneath the
outdoor unit.
4. Refrigerant amount
Before shipment, this air conditioner is filled with
the rated amount of refrigerant including additional
amount required for air-purging, subject to
7.5m(25ft) piping length. (The rated amount of
refrigerant is indicated on the name plate.) But
when the piping length exceeds 7.5m(25ft),
additional charge is required according to the
following table.
200mm(7.9 inch)
70mm(2.8 inch)
70mm(2.8 inch)
MODEL (BTU/h)
REFRIGERANT CHARGE
40g/m(1.41oz/m)
48k
30k
30g/m(1.06oz/m)
Example)
Wall
In case of 15m(49ft) long pipe(one-way), the
amount of refrigerant to be replenished is:
48k : (15-7.5) x 40 = 300g
Core Drill
(15-7.5) x 1.41 = 10.58oz
INSIDE
OUTSIDE
Wall
Plastic tube
(Bushing)
Tilt
Cut if necessary
More than 15mm(0.6 inch)
Insert the plastic tube through the hole.
Cut the extruded outside part of the plastic tube,
if necessary.
–24–
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Test running
1. PRECAUTIONS IN TEST RUN
• The initial power supply must provide at least 90% of the rated voltage.
Otherwise, the air conditioner should not be operated.
Carry out the test run more than 5 minutes without fail.
Caution
(Test run will be cancelled 18 minutes later automatically)
• The test run is started by pressing the down room temperature checking button and ON/OFF button for 3
seconds at the same time.
• To cancel the test run, press ON/OFF button.
CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE
• After completing work, be sure to measure and record trial run properties, and store measured data, etc.
• Measuring items are room temperature, outside temperature, suction temperature, blow out temperature, wind
velocity, wind volume, voltage, current, presence of abnormal vibration and noise, operating pressure, piping
temperature, compressive pressure.
• As to the structure and appearance, check following items.
Is the circulation of air adequate?
Is the draining smooth?
Is the remote controller switch operated?
Is there any faulty wiring?
Is the heat insulation complete
(refrigerant and drain piping)?
Are not terminal screws loosened?
.
.
M4...118N cm{12kgf cm}
M5...196N cm{20kgf cm}
Is there any leakage of refrigerant?
0.8 lbf.ft(10 lbf.in)
1.4 lbf.ft(17 lbf.in)
.
.
M6...245N cm{25kgf cm}
M8...588N cm{60kgf cm}
1.8 lbf.ft(22 lbf.in)
4.3 lbf.ft(52 lbf.in)
2. Connection of power supply
1. Connect the power supply cord to the independent power supply.
• Circuit breaker is required.
2. Operate the unit for fifteen minutes or more.
3. Evaluation of the performance
1. Measure the temperature of the intake and discharge air.
2. Ensure the difference between the intake temperature and the discharge one is more than 8°C(46.4°F)
(Cooling) or reversely (Heating).
–25–
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CAUTION
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power specialized for the air conditioner. As for the method of wiring,
be guided by the circuit diagram pasted on the inside of control box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from
vibrations to which the unit is subjected during the course of transportation. Check them and
make sure that they are all tightly fastened. (If they are loose, it could give rise to burn-out of the
wires.)
4) Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked
on the name plate.
7) Confirm that the cable thickness is as specified in the power sources specification.
(Particularly note the relation between cable length and thickness.)
8) Never fail to equip a leakage breaker where it is wet or moist.
9) The following troubles would be caused by voltage drop-down.
• Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to the
normal function of a overload protection device.
• Proper starting power is not given to the compressor.
HAND OVER
Teach the customer the operation and maintenance procedures, using the operation manual (air filter cleaning,
temperature control, etc.).
If Error Code happens in the display of indoor.
Error Code
Error Contents
Checking Point
Indoor Air Sensor Open or Short
C0
C1
C3
C4
1.Check Sensor Connection to PCB whether it's
connected well or not.
2.Replace it with new Sensor.
Indoor Pipe Sensor Open or Short
Outdoor Air Sensor Open or Short
Outdoor Pipe Sensor Open or Short
C5
Communication failure between
Indoor and outdoor unit.
1.Check connecting cable wiring order between
Indoor and outdoor diagram.
2.Check all wire connector whether it is connected
or not.
3.Indoor AC PCB defects.(short inside).
4.Outdoor PCB defects.(short inside)
–26–
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Troubleshooting Guide
Failures to Start
Check power source.
Check of circuit breaker
and fuse.
Check control switch
setting.
Check control switch.
Compressor only fails to
start
Fan only fails to start
Improper wiring
Electric heater is not energized
Drop of power voltage
Loose terminal connection.
Improper wiring
Defect of fan motor
capacitor.
Defect of compressor
capacitor
Irregular motor
resistance ( Ω )
Irregular motor
insulation ( Ω )
Capacitor check
Replacement
Replacement of fan motor.
Improper electric heater
Irregular motor resistance ( Ω )
Regular but fails to start.
Replacement of electric
heater
Irregular motor insulation ( Ω )
Replacement of compressor
Replacement of compressor
–27–
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PACKAGE AIR CONDITIONER VOLTAGE LIMITS
NAME PLATE RATING
380 V
MINIMUM
MAXIMUM
418 V
342 V
198 V
342 V
220 V
242 V
380 - 415 V
456 V
No cooling and heating operation performed
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Other parts than the unit
Electric supply interrupted Measure it with a tester in
Defective power wiring Cut case that the same
Repair a switch box and
is relative instrument.
of power fuse
power source is supplied
to other equipment than
the unit, what and where
trouble can be discovered
by checking the operation
of other equipment.
Replacement of fuse
Request a power
supplier to repair.
Check the power source.
Use a thick cable if
necessary.
Measure it with a tester.
Too low voltage
Control point is on
condition of "OFF" due to
trouble.
Magnetic switch for
compressor & fan motor
Make short-circuit, then
measure it with a tester.
Replace it if necessary.
Operating switch
Protection devices
Troubled or defective
contactor
Check it with the eyes or
tester.
Repair or replace it.
Discover the trouble
cause and push the rest
button.
Check it with the eyes or
tester.
Opened the contact point
with trouble
2) Only blowers do not work
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Air volume change over
switch
Troubled or defective
contact point
Check it with the eyes or a Repair or replace it.
tester
Defected
Capacitor
Check it with a tester.
Replace it.
–28–
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3) Only outdoor fan does not work
WHAT TROUBLED
Motor
COMPLAINTS
HOW TO CHECK
REMEDY
Over-heated
Layer short
Check how it is insulated.
Repair or replace it.
Electric Wiring
Open wire on operation
Check it with a tester.
Rewiring or repair.
Short circuited on
operation
4) Only compressor does not work
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Magnetic switch for
compressor motor
Check it with the eyes on
with a tester.
Defective contact,
magnetic coil troubled.
Repair or replace it.
Compressor motor
Troubled over-heated
(layer short)
Check how it is insulated.
Replace or repair the
compressor.
Compressor
Troubled or over-heated
(lock)
Groaned noise of motor
Check it with a tester.
Check it with a tester.
Repair or replace it.
High pressure switch
Electric circuit
Troubled or defective
contact or operating
Replace it if necessary.
Defective connection or
disconnection of the circuit
for compressor.
Rewiring or push reset
button.
–29–
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The Units discontinue after the operation started
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
Checking
REMEDY
Other parts than the unit Improper opening of the
service valves in the
Open it properly
refrigerant line
Wash it by means of
something like chemical
washing.
Checking
Outdoor coil
Coil is dirty *1
Extract air by vacuum
pump, then recharge the
refrigerant.
Air intruded into the
refrigerant pipe line *1
In the event that
In-condensable gas
blended.
difference between the
saturating temperature
corresponding to high
pressure and the
temperature of air
discharged from the
outdoor coil is more than
15°C, incondensable gas
may be blended.
Readjust it to normal
operating pressure.
(Note)
Check it with a pressure
gauge.
High pressure switch
Improper adjustment
Don't alternate the
specified adjusting
pressure. If the adjusted
pressure exceeds the
specified range, it will
cause a great accident.
Refrigerant
A shortage of refrigerant
amount. * 2
Recharge the
refrigerant. Repair the
spot where it leaks.
Outdoor Fan
If reversed, connect
interchanged wires to
each terminal.
Reverse rotation of fan
Obstacle
Air short circuit *1
Confirm the wind blowing
out.
Check it with eyes.
Power wirings.
Note: Use an appropriate measuring instrument for readjustment.
*1: Check the High-pressure switch indication.
*2: Check the Low- pressure switch indication.
–30–
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The unit is working, but not cooling and heating sufficiently
(Both blower and compressor are working)
WHAT TROUBLED
Load
COMPLAINTS
Much heat load
HOW TO CHECK
REMEDY
Heat load increased.
Window or door has many
cracks or gaps.
Do necessary disposal
respectively.
Correct it.
Correct it.
Air flow
Obstacle disturbs Intake
of uniform wind.
Checking
Short air volume
Refrigerant
Reverse rotation of
blower.
Checking
Replenish it.
(Repair the leakage spot).
Coil inlet pipe is frosted
Shortage in the charged
refrigerant.
Air passage
Air filter
Improper or foreign bodies
Clogged with dust
Checking
Checking
Correct or clear the
foreign bodies.
Cleaning
9.4 All the functions are performed normally, but very noisily and much vibratively.
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Compressor
Liquid refrigerant flooding
back from the evaporator.
• Check for refrigerant over-charge.
• Check to see if the intaking air temperature is
extremely cold.
• Check for insufficient air flow quantity.
• Checking
• Remove the shipping
bracket.
Compressor shipping
bracket is not removed.
Faulty discharge valve and
suction valve.
• Checking
• Replace the
compressor
Blower
Screws
• Repair or replace it.
• Clear the other
material
Checking
Fan broken.
Other materials intruded.
Repair
Checking
Looseness or fail-off of
screws
–31–
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WHAT TROUBLED
COMPLAINTS
Defective contact.
Defective contact point.
Rusting and faults in the iron
core contact face. Defective
contact of the
HOW TO CHECK
Checking
REMEDY
Electric troubles
(Magnetic
contactor)
Repair and clean or
replace it.
operating switch.
Correct it.
Others
Improper installation
Checking
Trouble checking by protection devices
Fault
Cause
Check/Correcitve Action
1. Check the operation of the outdoor motor.
2. Check discharge and suction, air
circulation.
High Discharge
Condenser cooling air extremely hot or
insufficient air flow through the condenser
Clean condenser coil.
Inside of the condenser tube is clogged.
Air in the refrigeration cooling cycle.
Purge air from the cycle.
Suction pressure is higher than standard.
See "High Suction Pressure".
Faulty discharge valves or suction valves of
the compressor.
Low
Discharge
1. Check unit operation input
2. Check the suction pressure.
Refrigerant low-charge or leakage.
Add refrigerant: repair leakage if any.
Suction pressure is lower than standard.
See "Low Suction Pressure".
Intake air extemely hot or excessive air flow
through the evaporator coil.
1. Check fresh air, intake or check for
leakage of the return air.
2. Check air flow quantity.
High
Suction
Pressure
Purge the refrigerant.
Refrigerant over-charge.
Faulty discharge valve or suction valve of
the compressor.
Check the operating input.
Discharge pressure is higher than standard
See "High discharge Pressure".
1. Check air flow quantity.
2. Check air filter.
Intake air extremely cold or insufficient air
flow through the evaporator coil.
Low
Suction
Pressure
3. Check evaporator coil frosting
Add refrigerant, repair leakage, if any.
Check the capillary tube and the strainer.
Refrigerant short-charge or leakage.
Restricted liquid in the suction line.
–32–
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Fault
Cause
Check/Correcitve Action
Discharge pressure is lower than standard.
See "Low Discharge Pressure".
Check the power supply line and the
contactor.
Single or three phases running.
High or low voltage or phase unbalance.
Refrigerant short charge or leakage.
Compressor frequently stops and starts.
Check the voltage and phase unbalance.
Internal
Thermostat
Cut-Off
Add refrigerant, repair leakage, if any.
Check thermistor operation, or any other
cause for frequent stop and start operation.
See "High Discharge Pressure" or "High
Suction Pressure".
Discharge and suction pressure are
extremely high.
Check the voltage and phase unbalance.
High or low voltage, or phase unbalance.
Single or three phases running
Overcurrent
Relay for
Compressor
Cut-Off
Check the power supply line and the
contact.
Faulty compressor motor.
Check electric resistance among the
compressor terminals, and from the
terminals to ground.
Check the electric connections.
Loose connections.
Compressor frequently stops and starts.
Check the operation of the thermistor, or
any other cause for frequent stop.
High or low voltage, or phase unbalance.
Single or three phases running.
Check the voltage and electric wiring.
Overcurrent
Relay for
Fan Motor
Cut-Off
Check the power supply line and the
contactor.
Check the fan motor and wiring.
Check the elelctric connections.
Faulty fan motor.
Loose connection.
Faulty fan bearing.
Check repair or replace the bearing.
Check the electric connections.
Loose connections.
Fuse Blown
Single or three phase running.
Check the power supply line.
Faulty motor.
Check electric resistance among motor
housing, and from the terminals to
ground.
1. Check the wires and connect where
necessary.
Disconnection.
Faulty contact.
Disconnection
and Faulty
Contact
2. Check the contact holding coil.
Check the contact in the magnetic
contact, the over-current relay, the
pressure control switch, the operation
switch, the auxiliary relay.
–33–
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Electronic Parts Troubleshooting Guide
1) No cooling operation performed.
Is the AC220V
YES
(AC 240 V) between Connector(CN-
outunit) Pin 1 and Pin 3 of
Main P.C.B
Is the input power
AC220V (AC240V) at COMP
Magnetic coil?
NO
NO
YES
NO
Is the unit operating?
Check the magnetic
contactor of outdoor unit.
Check the wiring
diagram.
YES
ON/OFF S/W ON
NO
NO
NO
Is it Cooling mode?
YES
Select the cooling
operation mode.
Room temp, > Set temp?
YES
Room temp, >set temp
setting
Is the DC5V at 14
pin of MICOM
YES
Replacement MICOM
Replacement IC02M, RY-COMP
–34–
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2-1) Indoor fan does not operate
Is the unit
operating?
NO
NO
Reset the power ON/OFF S/W
YES
Is the DC5V
at 20pin of
(MICOM)?
YES
Is the DC5V
NO
at 21pin of
(MICOM)?
YES
Is the DC5V
at 22pin of
(MICOM)?
NO
Replacement
(MICOM) and
check the EVA-Th.
YES
Is the DC12V
NO
Is the DC12V
at each terminal
RY- Mid Coil
Is the DC12V
at each terminal
RY-High Coil
NO
NO
at each terminal
RY-S/High Coil
YES
YES
YES
Replacement ICO3M
Is the
Is the
AC220V(240V)
between "C" and "Mid"
of P.C.B?
Is the
AC220V(240V) between
NO NO
NO
AC220V(240V) between
"C" and "S/High" of
P.C.B?
"C" and "High" of P.C.B?
YES
YES
YES
Replacement S/High
Replacement High
Replacement RY-Mid
Check the motor winding
–35–
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3) Airflow Direction does not operate.
NO
Is the unit operating?
The power ON/OFF S/W ON
Press the Auto Swing S/W
YES
NO
Is the Auto Swing S/W "ON"?
YES
NO
Is the DC5V at 16 terminal?
Replacement MICOM
Replacement ICO2M
(MICOM)
YES
Is the DC12V
NO
at each terminal?
(RY-Sync COIL)
YES
Is the AC220V(240V)
at each terminal
(SYN. MOTOR CONNECTOR)?
Replacement RY-Sync
Check synchronous connector
contact point.
NO
YES
Check the synchronous
motor winding.
–36–
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4) Remote control does not operate.
NO
NO
Is the battery of remote
controller normal?
Replacement battery
YES
Is the CN-Disp1
connector normal?
Check the connector.
CN-Disp1
YES
Does the operation
of remote controller
properly?
NO
NO
Replacement remote-controller
Replacement preamp assy
YES
Is the Pre-amp of
display normal?
YES
Replacement MICOM
–37–
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5) The unit does not operate.
Is the AC220V
NO
NO
1. Check the electric connections
2. Check the fuse of Main PCB ASM
(240V) at Trans input terminal?
YES
Replacement Trans
Is the AC12-18V at
Trans (2nd)?
YES
NO
NO
Is the connector of
Main/Display correct?
Check the connector of
Main/Display
YES
Is the DC5V between PIN64
and PIN 32 of MICOM?
1. Replacement ICO3D
2. Replacement Main PCB ASM
YES
Replacement Main PCB ASM
Replacement Micom
6) Timer control does not operate.
–38–
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7) No heating operation works
Is the AC220V
YES
(AC 240 V) between connector
(CN-outunit) Pin 1 and Pin 3 of
Main P.C.B
Is the input power AC220V
(AC240V) at COMP magnetic coil
contactor?
NO
NO
NO
Is the unit operating?
YES
Check the wiring
connection
Check the COMP magnetic
contactor of outdoor unit.
YES
NO
NO
ON/OFF S/W ON
Is it heating mode?
Select the heating operation mode.
Room temp. < Set temp. Setting
YES
Room temp <Set temp?
YES
Is the DC5V
at 14 pin of Micom terminal
NO
NO
NO
Replacement MICOM
Replacement MICOM
YES
Is the DC5V
at 18 pin of Micom terminal
YES
Is the DC12V
at each terminal?
(RY-4way COIL)
Replacement ICO2M
YES
Is the
NO
NO
NO
AC220V (AC 240 V) between
connector(4WAY) and CN-outunit Pin 1 of
Replacement RY-4way
Replacement ICO2M
Main
P. C. B
YES
Is the DC12V at
each terminal?
YES
Is the AC220V
(AC 240 V) between connector(CN-outunit)
Pin 1 and Pin 3 of Main
P. C. B
Replacement RY-Comp
YES
–39–
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8) No heater operation works
NO
Select the heating operation mode.
Is the heating operating?
YES
Is the Compressor
operating?
NO
NO
Compressor "ON"
Heat S/W "ON"
YES
Is the Heat S/W of Main
PCB "ON"?
YES
NO
NO
Is the DC 5V at 15 pin of
MICOM
Replacement MICOM
Replacement ICO2M
YES
Is the
DC 12V at eack terminal?
(RY-Heater COIL)
YES
Is the
AC220V (AC 240 V) between
connector(HEATER) and CN-outunit Pin 1
of Main P.C.B
NO
Replacement RY-Heater
YES
Check the heater wiring
–40–
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Exploded View and Replacement Parts List
1. Indoor Unit
• Model : LF300CP(LP-C303R20)
137211
235811-1
132100
235512
235811-2
249941
267110
W0CZZ
249951
135313-2
268711-1
268711-2
159830
237201
135313-1
–41–
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W52103
W4811-2
W4810-2
354210
W4811-1
Eva-out
567480-3
135515
35211A
35211C
130911
336610
266000
336600
352150
W4810-1
349480
Inlet-air
567480-1
337000
159830-1
346810
140570
359012
W1WE
W1NF
730700
–42–
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• Model : LF480CE(LP-C483TA0)
135310
146811
135080-2
135080-1
267110
146812
137211
268711-1
567480-1
Inlet-air
W4811
268711-3
Eva-out
567480-3
W4810-2
135080-3
552111
237202
354210
35211A 35211C
W4810-1
330870
152302
135080-4
135313
–43–
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135515
130911
249951
249941
268711-2
W4810
135500
W0CZZ
359012
336610
346810
349480
135317
150170
349600
130400
–44–
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2. Outdoor Unit
• Model : LF300CP(LP-C303R20)
–45–
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• Model : LF480CE(LP-C483TA0)
–46–
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December, 2006
Printed in Korea
P/No.: 3828A20156T
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