LG LF480CE User Manual

Floor Standing Type
Air Conditioner

SERVICE MANUAL

MODEL: LF300CP(LP-C303R20)

LF480CE(LP-C483TA0)

Contents

Safety Precautions..................................................................................................................3

Functions .................................................................................................................................7

Product Specifications .........................................................................................................10

Dimensions............................................................................................................................11

Wiring Diagram......................................................................................................................15

Operation Details ..................................................................................................................17

Installation of Indoor, Outdoor Unit.....................................................................................23

Test Running .........................................................................................................................25

Troubleshooting Guide .........................................................................................................27

Exploded View and Replacement Parts List.......................................................................41

–2–

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must
be followed.

■ 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.

■ Meanings of symbols used in this manual are as shown below.

Be sure not to do.

Be sure to follow the instruction.

■ Installation

Do not use a defective or
underrated circuit breaker. Use
this appliance on a dedicated
circuit.

• There is risk of fire or electric
shock.

Always install a dedicated
circuit and breaker.

• Improper wiring or installation may
cause fire or electric shock

Always ground the product.

• There is risk of fire or electric
shock.

Use the correctly rated
breaker or fuse.

• There is risk of fire or electric
shock.

Install the panel and the cover
of control box securely.

• There is risk of fire or electric
shock.

Do not modify or extend the
power cable.

• There is risk of fire or electric
shock.

–3–

Do not install, remove, or re­install 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,
explosion, or injury.

Do not install the product on a
defective installation stand.

• It may cause injury, accident, or
damage to the product.

• Sharp edges could cause injury.
Be especially careful of the case
edges and the fins on the
condenser and evaporator.

Be sure the installation area
does not deteriorate with age.

• If the base collapses, the air
conditioner could fall with it,
causing property damage, product
failure, and personal injury.

• There is risk of fire, electric shock,
explosion, or injury.

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.

• Moisture may condense and wet or
damage furniture.

■ Operational

Do not touch(operate) the
product with wet hands.

• There is risk of fire or electrical
shock.

Do not place a heater or other
appliances near the power
cable.

• There is risk of fire or electric
shock.

–4–

Do not let electric parts of the
product get wet.

• There is risk of fire, failure of the
product, or electric shock.

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.

Gasolin

Do not open the inlet grill of the product during
operation. (Do not touch the electrostatic filter,
if the unit is so equipped.)

• There is risk of physical injury, electric shock, or
product failure.

• There is risk of electric shock or fire.

Be cautious that water could not enter the
product.

• There is risk of fire, electric shock, or product damage.

■ Installation

Always check for gas (refrigerant) leakage after
installation or repair of product.

• Low refrigerant levels may cause failure of product.

Install the drain hose to ensure that water is
drained away properly.

• A bad connection may cause water leakage.

–5–

Keep level even when installing the product.

Use two or more people to lift and transport
the product.

• To avoid vibration or water leakage.

90˚

■ Operational

Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.

• There is risk of fire, electric shock, or damage to the
plastic parts of the product.

• Avoid personal injury.

Do not touch the metal parts of the product
when removing the air filter. They are very
sharp!

• There is risk of personal injury.

Thinner

Wax

Do not step on or put anyting on the product.
(outdoor units)

• There is risk of personal injury and failure of product.

Do not insert hands or other objects through
the air inlet or outlet while the product is
operated.

• There are sharp and moving parts that could cause
personal injury.

–6–

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–

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–

Outdoor Unit

Deice Control

• De-ice PCB

Outdoor Fan Speed Control

• One speed

Sensing Heat Exchanger Temperature

• Heat exchanger temperature sensor (Thermistor)

(Heating Model Only)

–9–

Product Specifications

MODEL

POWER SOURCE (ø, V, Hz)

COOLING CAPACITY BTU/h

INPUT W

CURRENT A

HEATING CAPACITY BTU/h

INPUT W

CURRENT A

MAKER

TYPE

COMPRESSOR MODEL

CAPACITY BTU/h

CURRENT A

INPUT W

NOISE INDOOR

LEVEL(1m) OUTDOOR

W

W

dB(A)

LF300CP(LP-C303R20) LF480CE(LP-C483TA0)

1, 208/230, 60 1, 208/230, 60

28,000 48,000

8,206 14,067

2,600 4,500

11.5 20

--

--

--

--

LG LG

Rotary Rotary

QJ250KAB/QK145KBD QP325KBD * 2

17,658/10,100 24000

7.7/4.5 10.2

1,635/935 2162

50/45/39/32 57/54/51

56 62

AIR INDOOR

VOLUME OUTDOOR

REFRIGERANT R-22

HEAT INDOOR R/C/FPI

EXCHANGER OUTDOOR R/C/FPI

FAN INDOOR

OUTDOOR

ROOM TEMPERATURE CONTROL

NET INDOOR

WEIGHT OUTDOOR

Gross Weight INDOOR kg(lbs)

OUTDOOR

DIMENSIONS INDOOR

(W ¥ H ¥ D) OUTDOOR

SVC LIQUID

VALVE GAS

POWER CABLE P*mm

CONNECTING CABLE P*mm

BREAKER CAPACITY A

CMM

(CFM)

kg(Oz)

TYPE

kg(lbs)

mm

(Inch)

mm

(Inch)

2

2

20/16.5/13/6 (706/583/459/212) 35/33/30(1,236/1,165/1,059)

47 (1,660) 104(3,672)

1.84 (65) 3.92(124.2)

2R/30C/18FPI 3R/28C/18FPI

2R/36C/20FPI 2R/26C/21FPI

TURBO FAN TURBO FAN

Propeller Propeller

Thermistor Thermistor

32(70.5) 58(127.9)

66(145.5) 90(198.4)

38(83.8) 66(145.5)

71(156.5) 100(220.5)

570 x 1,820x 310 (22.45 x 71.7 x 12.2) 590 x 1,810 x 440 (23.23 x 71.26 x 17.32)

870 x 808 x 320 (34.3 x 31.8 x 12.6) 900 x 1,225 x 370 (35.43 x 48.23 x 14.57)

9.52(3/8) 9.52(3/8)

15.88(5/8) 19.05(3/4)

3x4.0 3x5.5

4x1.0 4x1.0

30 40

–10–

Cool air outlet(2 sides) by

Manual operation

Cool air outlet(front side)

Top/Bottom Airflow Controller

Left/Right Airflow Controller

Sliding Clean Door

Display Panel

Antibiotic Filter

Air Inlet

Air Inlet

Antibiotic Filter

Plasma Deodorant Air Cleaner

Remote Controller Holder

Control Panel

Top/Bottom Airflow Controller
Left/Right Airflow Controller

Air Outlet

Bottom Panel

Ground Terminal

Refrigerant Pipe Port

Air Inlet(back side)

Control Cover

Dimensions

Indoor Unit: LPNC303R20 (LF300CP)

Outdoor Unit : LPUC303R20 (LF300CP)

–11–

Indoor Unit

800mm(31.5inch)

180mm(7.1inch)

101mm(4.0inch)

370mm(14.6)

340mm(13.4inch)

95mm

870mm(34.3inch)

320mm(12.6inch)

546mm(21.5inch)

5

3

1

2

4

1820mm(71.7inch)

570mm(22.4inch)

311mm(12.2inch)

180mm(7.1inch)

101mm(4.0inch)

No. Items

1 Control Display
2 Air outlet vent
3 Air inlet vent

Outdoor Unit

No. Items

1 Gas side service valve (Ø 15.88mm(5/8inch))
2 Liquid side service valve (Ø 9.52mm(3/8inch))
3 Fan cover
4 Earth screw
5 Connecting cable hole

–12–

Air Intake Vent
(Rear)

Air Outlet

Vent

Piping

Air Outlet Vent

Remote Signal
Receptor

Air Intake Vent

Indoor Unit : LPNC483TA0 (LF480CE)

door Unit : LPUC483TA0 (LF480CE)

–13–

Indoor Unit

210mm(8.3inch)

290mm(11.4inch)

505mm(19.9inch)

130mm(5.1inch)

41mm(1.6inch)

40mm(1.6inch)

139mm(15.5inch)

260mm(10.2inch)

486mm(19.1inch)

260mm(10.2inch)

260mm(10.2inch)

1850mm(72.8inch)

1540mm(60.6inch)

2

590mm(23.2inch)

525mm(20.7inch)

79mm(3.1inch)

No.

1A
2 Air Inlet Vent
3

439mm(17.3inch)

1

3

950mm(37.4inch)

134mm(5.3inch)

338mm(13.3inch)

Items

ir Outlet Vent

Control display

40mm(1.6inch)

40mm(1.6inch)

562mm(22.1inch)

139mm(15.5inch)

41mm(1.6inch)

41mm(1.6inch)

Outdoor Unit

No. Items

1A
2 Liquid Side SVC Valve(Ø
3 Gas Side SVC Valve(Ø
4 Control Box
5

130mm(5.1inch)

130mm(5.1inch)

90mm(3.5inch)

505mm(19.9inch)

460mm(18.1inch)
640mm(25.2inch)
900mm(35.4inch)

370mm(14.6inch)

125mm(4.9inch)

460mm(18.1inch)

ir Outlet Vent

Earth Screw

1220mm(48.0inch)

290mm(11.4inch)

290mm(11.4inch)

210mm(8.3inch)

210mm(8.3inch)

9.52mm(3/8inch))

19.05mm(3/4inch))

–14–

Wiring Diagram

1. LF300CP(LP-C303R20)

Outdoor

–15–

2. LF480CE(LP-C483TA0)

Outdoor

–16–

Intake Air temp.

Setting Temp. +1°C(1.8°F)

(Compressor ON)

Setting Temp. -1°C(1.8°F)

(Compressor OFF)

Indoor Fan Speed

Selecting

fan speed

Selecting

fan speed

Selecting

fan speed

Selecting

fan speed

Selecting

fan speed

3 minutes

More than

3 minutes

More than

Compressor ON OFF ON OFF ON

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.

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–

5. Heating Mode Operation

Intake Air Temp.

Setting Temp.

(Compressor ON)

Setting Temp. -1°C(1.8°F)

Indoor Fan Speed

Compressor

ON OFF ON OFF

OFF

Hot

Start

minimum

10sec.

minimum

10sec.

minimum

10sec.

minimum

10sec.

OFF

AA

OFFLOW LOW

Setting Temp. +1°C(1.8°F)

(Compressor OFF)

Selecting

fan speed

Selecting

fan speed

Low(V)Stop(VI)

39°C(102.2°F)

Discharge Air Temp.

Indoor Pipe Temp.

34°C(93.2°F)

28°C(82.4°F)
26°C(78.8°F)

Selecting Fan Speed(IV)

Low(II)Stop(I)

(Hot-Start Operating)

Heating Start

(Hot-Start Release Point)

Selecting Fan Speed(III)

The unit will operate according to the setting by the remote controller and the operation diagram is shown as
following.

• 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.

Step Indoor fan speed Pipe temp. Air discharge temp.

Off

Low 28 C(82.4°F) < 39°C(102.2°F)

Selecting speed 28 C(82.4°F) ≥ 39°C(102.2°F)

Selecting speed 28 C(82.4°F) > 34°C(93.2°F)

Low 26 C(78.8°F) ≤ 34°C(93.2°F)

Off 26 C(78.8°F)

28 C(82.4°F)(Hot start operating)

–18–

6. Hot-Start Control

INDOOR PIPE

TEMP.

INDOOR FAN

SPEED

Selecting

fan speed

OFF OFFLOW

1min

Maximum

COMPRESSOR ON

28°C(82.4°F)

26°C(78.8°F)

More than 45 minutes of

heating operation

Outdoor Pipe Temp.

Indoor Fan

Compressor

4-Way Valve

ON

ON

ON

ON

OFF

ON

OFF

HOT-

START

ON

ON OFF OFFON

12°C(53.6°F)

(Defrost OFF)

-6°C(21.2°F)
(Defrost ON)

Within

10 minutes

Defrost

Defrost

More than 45 minutes of

heating operation

• 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.

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.

–19–

8. Soft Dry Operation Mode

Intake Air Temp.

Indoor Fan Speed

LOW

Selecting

fan speed

Selecting

fan speed

LOW LOW LOW LOW

Compressor OFFON ONON OFF OFF ON

LOW

OFF

Setting Temp.

+2°C(3.6°F)

(Compressor ON)

Setting Temp.

-1°C(1.8°F)

(Compresso OFF)

Operation

Cooling

Cooling

operation

Dry operation

3 min. 3 min.

10 min.

maximum

7 min.

maximum

10 min.

• 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.

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)

Mode Selecting

Initial Starting of
Air purifying
Operation

When switched to
Air purifying
operation

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.

Operating Mode

- Outdoor not operating

- Fan operating + Air
purifying operating

- Outdoor operating

- Main Operating +
Air purifying operating

- Low at the initial

- But could be

Selecting Speed of
Main Operating Mode

Fan Speed

switched to Med. Hi

Outdoor OFF

OFF

ON or OFF
depend on main
operating
condition.

Repress Air
purifying
Button or
ON/OFF
Button

–20–

12. Alarm mode display / only displayed while operating.

Setting energy

saving operation

Setting temp.
23°C(73.4°F)

21°C(69.8°F)

22°C(71.6°F)

23°C(73.4°F)

24°C(75.2°F)

25˚C(77.0°F)

26°C(78.8°F)

27°C(80.6°F)

Setting temp.
24°C(75.2°F)

Setting temp.
25°C(77.0°F)

maintains setting temp.

25°C(77.0°F)

28min.

50min. 50min. 50min.

35min. 47min.

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.

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
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)

Cooling mode

–21–

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–

Installation of Indoor, Outdoor Unit

A

B

Indoor unit

Outdoor unit

50mm(2inch)

1000mm(39.4inch)

Indoor unit

500mm(20inch)

500mm(20inch)

500mm (20inch)

1000mm(39.4inch)

400mm

(16inch)

400mm

(16inch)

500mm(20inch)

1. Selection of the best location

1) Indoor unit

• There should not be any heat source or steam
near the unit.

• There should not be any obstacles to prevent the
air circulation.

• A place where air circulation in the room will be
good.

• 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.

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.

• There should not be any animals or plants which
could be affected by discharged hot air.

• Ensure the space indicated by arrows from the
wall, ceiling, fence, or other obstacles.

3) Piping length and the elevation

Cooling Only Model

MODEL
(BTU/h)

48k 3/4" 3/8" 40/131 25/82

GAS SIDE LIQUID SIDE

PIPE SIZE

Max.
Length
A (m/ft)

Max.

Elevation

B (m/ft)

30k 5/8" 3/8" 30/98 20/66

–23–

2. Indoor Unit installation

Wall

Core Drill

Tilt

Cut if necessary

More than 15mm(0.6 inch)

Wall

Plastic tube
(Bushing)

INSIDE OUTSIDE

200mm(7.9 inch)

70mm(2.8 inch)

70mm(2.8 inch)

90mm(3.5 inch)

The mounting floor should be strong and solid
enough to prevent it from vibration.

Drill the piping hole with 2.8 inch diameter hole­core drill at either the right or the left of indoor
unit. The hole should be sightly slant to the
outdoor side.

3. Outdoor unit Installation

Install the outdoor unit on the concrete or any
solid base securely and horizontally by securing
it with bolts (Ø12mm(0.5inch)) and nuts.

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.

MODEL (BTU/h) REFRIGERANT CHARGE

48k 40g/m(1.41oz/m)

30k 30g/m(1.06oz/m)

Example)
In case of 15m(49ft) long pipe(one-way), the
amount of refrigerant to be replenished is:

48k : (15-7.5) x 40 = 300g

(15-7.5) x 1.41 = 10.58oz

Insert the plastic tube through the hole.

Cut the extruded outside part of the plastic tube,
if necessary.

–24–

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.

Caution

• 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.

Carry out the test run more than 5 minutes without fail.
(Test run will be cancelled 18 minutes later automatically)

Is the circulation of air adequate?
Is the draining smooth?
Is the heat insulation complete

(refrigerant and drain piping)?

Is there any leakage of refrigerant?

Is the remote controller switch operated?
Is there any faulty wiring?
Are not terminal screws loosened?

M4...118N cm{12kgf.cm}

0.8 lbf.ft(10 lbf.in)

M6...245N cm{25kgf.cm}

1.8 lbf.ft(22 lbf.in)

M5...196N cm{20kgf.cm}

1.4 lbf.ft(17 lbf.in)

M8...588N cm{60kgf.cm}

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–

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

C0

C1

C3

C4

C5

Indoor Air Sensor Open or Short

Indoor Pipe Sensor Open or Short

Outdoor Air Sensor Open or Short

Outdoor Pipe Sensor Open or Short

Communication failure between
Indoor and outdoor unit.

1.Check Sensor Connection to PCB whether it's
connected well or not.

2.Replace it with new Sensor.

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–

Troubleshooting Guide

Failures to Start

Check of circuit breaker
and fuse.

Check control switch.

Fan only fails to start

Improper wiring

Defect of fan motor
capacitor.

Irregular motor
resistance

( Ω )

Irregular motor
insulation

( Ω )

Replacement of fan motor.

Improper electric heater

Replacement of electric
heater

Regular but fails to start.

Replacement of compressor

Electric heater is not energized

Loose terminal connection.

Improper wiring

Irregular motor resistance ( Ω

)

Irregular motor insulation ( Ω

)

Replacement of compressor

Drop of power voltage

Capacitor check

Replacement

Compressor only fails to
start

Defect of compressor
capacitor

Check power source.

Check control switch
setting.

–27–

PACKAGE AIR CONDITIONER VOLTAGE LIMITS

NAME PLATE RATING MINIMUM MAXIMUM

380 V 342 V 418 V

220 V 198 V 242 V

380 - 415 V 342 V 456 V

No cooling and heating operation performed

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Other parts than the unit

Magnetic switch for
compressor & fan motor

Operating switch

Protection devices

Electric supply interrupted
Defective power wiring Cut
of power fuse

Too low voltage

Control point is on
condition of "OFF" due to
trouble.

Troubled or defective
contactor

Opened the contact point
with trouble

Measure it with a tester in
case that the same
power source is supplied
to other equipment than
the unit, what and where
trouble can be discovered
by checking the operation
of other equipment.

Measure it with a tester.

Make short-circuit, then
measure it with a tester.

Check it with the eyes or
tester.

Check it with the eyes or
tester.

Repair a switch box and
is relative instrument.

Replacement of fuse
Request a power

supplier to repair.

Check the power source.
Use a thick cable if
necessary.

Replace it if necessary.

Repair or replace it.

Discover the trouble
cause and push the rest
button.

2) Only blowers do not work

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Air volume change over
switch

Capacitor

Troubled or defective
contact point

Defected

Check it with the eyes or a
tester

Check it with a tester.

–28–

Repair or replace it.

Replace it.

3) Only outdoor fan does not work

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Motor

Electric Wiring

Over-heated
Layer short

Open wire on operation

Short circuited on
operation

Check how it is insulated.

Check it with a tester.

Repair or replace it.

Rewiring or repair.

4) Only compressor does not work

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Magnetic switch for
compressor motor

Compressor motor

Compressor

High pressure switch

Defective contact,
magnetic coil troubled.

Troubled over-heated
(layer short)

Troubled or over-heated
(lock)

Troubled or defective
contact or operating

Check it with the eyes on
with a tester.

Check how it is insulated.

Groaned noise of motor

Check it with a tester.

Repair or replace it.

Replace or repair the
compressor.

Repair or replace it.

Replace it if necessary.

Electric circuit

Defective connection or
disconnection of the circuit
for compressor.

Check it with a tester.

Rewiring or push reset
button.

–29–

The Units discontinue after the operation started

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Other parts than the unit

Outdoor coil

In-condensable gas
blended.

High pressure switch

Improper opening of the
service valves in the
refrigerant line

Coil is dirty *1

Air intruded into the
refrigerant pipe line *1

Improper adjustment

Checking

Checking

In the event that
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.

Check it with a pressure
gauge.

Open it properly

Wash it by means of
something like chemical
washing.

Extract air by vacuum
pump, then recharge the
refrigerant.

Readjust it to normal
operating pressure.
(Note)
Don't alternate the
specified adjusting
pressure. If the adjusted
pressure exceeds the
specified range, it will
cause a great accident.

Refrigerant

Outdoor Fan

Note: Use an appropriate measuring instrument for readjustment.

*1: Check the High-pressure switch indication.

*2: Check the Low- pressure switch indication.

A shortage of refrigerant
amount. * 2

Reverse rotation of fan
Obstacle
Air short circuit *1

Confirm the wind blowing
out.

Check it with eyes.

–30–

Recharge the
refrigerant. Repair the
spot where it leaks.

If reversed, connect
interchanged wires to
each terminal.
Power wirings.

The unit is working, but not cooling and heating sufficiently

(Both blower and compressor are working)

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Load

Air flow

Short air volume

Refrigerant

Air passage

Air filter

9.4

All the functions are performed normally, but very noisily and much vibratively.

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Much heat load

Obstacle disturbs Intake
of uniform wind.

Reverse rotation of
blower.

Shortage in the charged
refrigerant.

Improper or foreign bodies

Clogged with dust

Heat load increased.
Window or door has many
cracks or gaps.

Checking

Checking

Coil inlet pipe is frosted

Checking

Checking

Do necessary disposal
respectively.

Correct it.

Correct it.

Replenish it.
(Repair the leakage spot).

Correct or clear the
foreign bodies.

Cleaning

Compressor

Blower

Screws

Liquid refrigerant flooding
back from the evaporator.

Compressor shipping
bracket is not removed.

Faulty discharge valve and
suction valve.

Fan broken.

Other materials intruded.

Looseness or fail-off of
screws

• Check for refrigerant over-charge.

• Check to see if the intaking air temperature is

extremely cold.

• Check for insufficient air flow quantity.

• Checking

• Checking

Checking

Checking

• Remove the shipping
bracket.

• Replace the

compressor

• Repair or replace it.

• Clear the other

material

Repair

–31–

WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY

Electric troubles
(Magnetic
contactor)

Others

Defective contact.
Defective contact point.
Rusting and faults in the iron
core contact face. Defective
contact of the
operating switch.

Improper installation

Trouble checking by protection devices

Fault Cause Check/Correcitve Action

High Discharge

Condenser cooling air extremely hot or
insufficient air flow through the condenser

Inside of the condenser tube is clogged.

Air in the refrigeration cooling cycle.

Suction pressure is higher than standard.

Checking

Checking

Repair and clean or
replace it.

Correct it.

1. Check the operation of the outdoor motor.

2. Check discharge and suction, air
circulation.

Clean condenser coil.

Purge air from the cycle.

See "High Suction Pressure".

Low
Discharge

High
Suction
Pressure

Low
Suction
Pressure

Faulty discharge valves or suction valves of
the compressor.

Refrigerant low-charge or leakage.

Suction pressure is lower than standard.

Intake air extemely hot or excessive air flow
through the evaporator coil.

Refrigerant over-charge.

Faulty discharge valve or suction valve of
the compressor.

Discharge pressure is higher than standard

Intake air extremely cold or insufficient air
flow through the evaporator coil.

Refrigerant short-charge or leakage.

1. Check unit operation input

2. Check the suction pressure.

Add refrigerant: repair leakage if any.

See "Low Suction Pressure".

1. Check fresh air, intake or check for

leakage of the return air.

2. Check air flow quantity.

Purge the refrigerant.

Check the operating input.

See "High discharge Pressure".

1. Check air flow quantity.

2. Check air filter.

3. Check evaporator coil frosting

Add refrigerant, repair leakage, if any.

Restricted liquid in the suction line.

–32–

Check the capillary tube and the strainer.

Fault Cause Check/Correcitve Action

Internal
Thermostat
Cut-Off

Overcurrent
Relay for
Compressor
Cut-Off

Discharge pressure is lower than standard.

Single or three phases running.

High or low voltage or phase unbalance.

Refrigerant short charge or leakage.

Compressor frequently stops and starts.

Discharge and suction pressure are
extremely high.

High or low voltage, or phase unbalance.

Single or three phases running

Faulty compressor motor.

See "Low Discharge Pressure".

Check the power supply line and the
contactor.

Check the voltage and phase unbalance.

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".

Check the voltage and phase unbalance.

Check the power supply line and the
contact.

Check electric resistance among the
compressor terminals, and from the
terminals to ground.

Overcurrent
Relay for
Fan Motor
Cut-Off

Fuse Blown

Disconnection
and Faulty
Contact

Loose connections.

Compressor frequently stops and starts.

High or low voltage, or phase unbalance.

Single or three phases running.

Faulty fan motor.

Loose connection.

Faulty fan bearing.

Loose connections.

Single or three phase running.

Faulty motor.

Disconnection.

Faulty contact.

Check the electric connections.

Check the operation of the thermistor, or
any other cause for frequent stop.

Check the voltage and electric wiring.

Check the power supply line and the
contactor.

Check the fan motor and wiring.

Check the elelctric connections.

Check repair or replace the bearing.

Check the electric connections.

Check the power supply line.

Check electric resistance among motor
housing, and from the terminals to
ground.

1. Check the wires and connect where

necessary.

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–

YES

YES

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

Electronic Parts Troubleshooting Guide

1) No cooling operation performed.

Is the AC220V

(AC 240 V) between Connector(CN-

outunit) Pin 1 and Pin 3 of

Main P.C.B

ON/OFF S/W ON

Is the unit operating?

Is it Cooling mode?

Room temp, > Set temp?

Is the input power

AC220V (AC240V) at COMP

Magnetic coil?

Check the magnetic
contactor of outdoor unit.

Select the cooling
operation mode.

Check the wiring
diagram.

Is the DC5V at 14

pin of MICOM

Replacement IC02M, RY-COMP

Room temp, >set temp
setting

Replacement MICOM

–34–

2-1) Indoor fan does not operate

YES

YES

YES

YES YES YES

YES YES YES

YES

NO

NO

NO

NO

NONONO

NO NO NO

Is the unit

operating?

Is the DC5V

at 20pin of

(MICOM)?

Reset the power ON/OFF S/W

Replacement ICO3M

AC220V(240V) between

Is the DC12V

at each terminal

RY-S/High Coil

Is the

"C" and "S/High" of

P.C.B?

Is the DC5V

at 21pin of
(MICOM)?

Is the DC12V

at each terminal

RY-High Coil

Is the

AC220V(240V) between

"C" and "High" of P.C.B?

Is the DC5V

at 22pin of
(MICOM)?

Is the DC12V

at each terminal

AC220V(240V)

between "C" and "Mid"

RY- Mid Coil

Is the

of P.C.B?

Replacement

(MICOM) and

check the EVA-Th.

Replacement S/High

Check the motor winding

Replacement High Replacement RY-Mid

–35–

3) Airflow Direction does not operate.

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

Is the unit operating?

Is the Auto Swing S/W "ON"?

Is the DC5V at 16 terminal?

(MICOM)

Is the DC12V

at each terminal?

(RY-Sync COIL)

The power ON/OFF S/W ON

Press the Auto Swing S/W

Replacement MICOM

Replacement ICO2M

Is the AC220V(240V)

at each terminal

(SYN. MOTOR CONNECTOR)?

Check the synchronous
motor winding.

Replacement RY-Sync
Check synchronous connector
contact point.

–36–

4) Remote control does not operate.

YES

NO

YES

NO

YES

NO

YES

NO

Is the battery of remote

controller normal?

Is the CN-Disp1

connector normal?

Does the operation
of remote controller

properly?

Is the Pre-amp of

display normal?

Replacement battery

Check the connector.

CN-Disp1

Replacement remote-controller

Replacement preamp assy

Replacement MICOM

–37–

5) The unit does not operate.

YES

NO

YES

NO

YES

NO

YES

NO

(240V) at Trans input terminal?

Is the AC220V

Is the AC12-18V at

Trans (2nd)?

Is the connector of

Main/Display correct?

Is the DC5V between PIN64

and PIN 32 of MICOM?

1. Check the electric connections

2. Check the fuse of Main PCB ASM

Replacement Trans

Check the connector of
Main/Display

1. Replacement ICO3D

2. Replacement Main PCB ASM

Replacement Main PCB ASM

6) Timer control does not operate.

–38–

Replacement

Micom

7) No heating operation works

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

Is the AC220V
(AC 240 V) between connector
(CN-outunit) Pin 1 and Pin 3 of

Main P.C.B

Is the unit operating?

ON/OFF S/W ON

Is it heating mode?

Is the input power AC220V

(AC240V) at COMP magnetic coil

Check the COMP magnetic
contactor of outdoor unit.

contactor?

Check the wiring

connection

Room temp <Set temp?

Is the DC5V

at 14 pin of Micom terminal

Is the DC5V

at 18 pin of Micom terminal

Is the DC12V

at each terminal?

(RY-4way COIL)

Is the

AC220V (AC 240 V) between

connector(4WAY) and CN-outunit Pin 1 of

Main

P. C . B

Select the heating operation mode.

Room temp. < Set temp. Setting

Replacement MICOM

Replacement MICOM

Replacement ICO2M

Replacement RY-4way

Is the DC12V at

each terminal?

(AC 240 V) between connector(CN-outunit)

Is the AC220V

Pin 1 and Pin 3 of Main

P. C . B

–39–

Replacement ICO2M

Replacement RY-Comp

8) No heater operation works

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

Is the heating operating?

Is the Compressor

operating?

Is the Heat S/W of Main

PCB "ON"?

Is the DC 5V at 15 pin of

DC 12V at eack terminal?

MICOM

Is the

(RY-Heater COIL)

Select the heating operation mode.

Compressor "ON"

Heat S/W "ON"

Replacement MICOM

Replacement ICO2M

Is the

AC220V (AC 240 V) between

connector(HEATER) and CN-outunit Pin 1

of Main P.C.B

Check the heater wiring

Replacement RY-Heater

–40–

Exploded View and Replacement Parts List

267110

237201

135313-1

135313-2

235811-2

235811-1

137211

132100

235512

249941

268711-1

249951

159830

W0CZZ

268711-2

1. Indoor Unit

• Model : LF300CP(LP-C303R20)

–41–

130911

35211C

354210

W4811-1

567480-3

Eva-out

336610

W4810-1

730700

346810

359012

W1NF

140570

W1WE

349480

567480-1

Inlet-air

159830-1

337000

266000

352150

336600

W4810-2

W4811-2

135515

W52103

35211A

–42–

268711-3

268711-1

567480-1

Inlet-air

567480-3

Eva-out

W4810-2

137211

237202

35211A 35211C

152302

135313

330870

146812

W4810-1

354210

552111

W4811

267110

135080-2

135310

146811

135080-1

135080-3

135080-4

• Model : LF480CE(LP-C483TA0)

–43–

359012

346810

150170

130400

349480

135317

135500

268711-2

249941

249951

W4810

W0CZZ

336610

135515

130911

349600

–44–

2. Outdoor Unit

435512

437210

349480-1

447910

559010

546810

349600

W0CZZ-2

W0CZZ-1

W6920

W5210D

552113

552201

554160-1

554160-2

552200

661400

649950

554030

137213-1

435300

137213-2

435511

552203-1

552203-2

430410

435301

268711-4

548490

567480-4 552112

Air

Accum.

• Model : LF300CP(LP-C303R20)

–45–

• Model : LF480CE(LP-C483TA0)

437212

435512

435301

437210

559010

137213

435511

546810

447900

554031

552203-2

552203-1

430411

349600-1

W5210D

554160

552112

552201

552200

661400

552113

649950

W0CZZ-1

268711-4

567480-4

Air

Accum.

548490

–46–

P/No.: 3828A20156T

December, 2006

Printed in Korea