Room Air Conditioner SVC MANUAL(General)

Internal Use Only http://biz.lgservice.com

Room Air Conditioner

SVC MANUAL(General)

MODEL : General Wall Mounted-Inverter Type

CAUTION

Before Servicing the unit, read the safety precautions in General SVC manual.

Only for authorized service personnel.

Air Conditioner Service Manual

CONTENTS

Part 1 General Information

1. Safety Precautions........................................................................................................4

2. Nomenclature ...............................................................................................................7

Part 2 Functions & Controls

1. List of Functions & Controls........................................................................................9

2. Basic Mode Controls .................................................................................................10

3. Special Mode Controls ...............................................................................................12

4. Utility Functions .........................................................................................................13

Part 3 Test Run

1. Check before Test Run ...............................................................................................17

2. Test Run Flow chart ....................................................................................................18

3. Test Run Detail ............................................................................................................19

Part 4 Trouble Shooting Guide

1. 2-Way, 3-Way Valve ....................................................................................................21

2. Pumping Down ...........................................................................................................22

3. Evacuation (All amount of refrigerant leaked) ........................................................23

4. Gas Charging (After Evacuation) ..............................................................................24

5. Cycle Troubleshooting Guide ....................................................................................25

6. Electric Parts Troubleshooting Guide .......................................................................26

7. Self-diagnosis Function .............................................................................................30

Copyright ©2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

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LGE Internal Use Only

Part 1 General Information

1. Safety Precautions ............................................................................................................4

2. Nomenclature......................................................................................................................7



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Part 1 General Information

1. 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.

Dangerous Voltage

1.1 Cautions in Repair

Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair.Internal components and circuit boards are at main potential when the equipment is connected to the power cables. This high voltage is extremely dangerous and may cause death or severe injury if come in contact with it.

Do not touch the discharging refrigerant gas during the repair work.

The discharging refrigerant gas.The refrigerant gas can cause frostbite.

Release the refrigerant gas completely at a well-ventilated place first.

Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating machine oil discharges and it Can cause injury.

When the refrigerant gas leaks during work, perform ventilation. If the refrigerant gas comes in contact with a fire, poisonous gas generates. A case of leakage of the refrigerant and the closed room full with gas is dangerous because a shortage of oxygen occurs. Be sure to perform ventilation.

When removing the front panel or cabinet, execute short-circuit and discharge between high voltage capacitor terminals. If discharge is not executed, an electric shock is caused by high voltage resulting in a death or injury.

Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock.



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Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock.

Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc.

Indoor/outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals. Improper or loose connections can cause heat generation or fire.

Do not touch, operate, or repaire the product with wet hands. Holding the plug by hand when taking out. Otherwise there is risk of electric shock or fire.

Do not turn on the breaker when the front panel and cabinet are removed.

Be sure to ground the air conditioner with an earthing conductor connected to the earthing terminal.

Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating cycle section can cause burns.

Do not tilt the unit while removing panels. Otherwise, the water inside the unit can spill and wet floor.

Do not use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen deficiency.

Be sure to turn off power switch before connecting or disconnecting connector, or parts damage may be occur.



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1.2 Inspections after Repair

Check to see if the power cable plug is not dirty or loose. If the plug is dusty or loose it can cause an electrical shock or fire.

Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. otherwise, it can cause an electrical shock, excessive heat generation or fire.

Do not insert hands or other objects through the air inlet or outlet while the product is operating. There are sharp and moving parts that could cause personal injury.

Do not block the inlet or outlet of air flow. It may cause product failure

Check to see if the parts are mounted correctly and wires are connected.

Improper installation and connections can cause an electric shock or an injury.

Check whether the installation platform or frame has corroded. Corroded installation platform or frame can cause the unit to fall, resulting in injury.

Be sure to check whether the earth wire is correctly connected.

After the work has finished, be sure to do an insulation test to check whether the resistance is 2[Mohm] or more between the charge section and the non-charge metal section (Earth position). If the resistance value is low, a disaster such as a leak or electric shock is caused at user’s side.

Check the drainage of the indoor unit after the repair. If drainage is faulty the water may enter the room and wet floor.



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2. Nomenclature

2.1 Global Model Name

A S W 1 2 6 B M S 0

1 2 3 4 5 6 7 8 9 10

Code

1

Type

Production Center,

Refrigerant

Code of Model

A~Z

Meaning

L: Chang-won R22

A: Chang-won R410A


7

8

9

2

3

Product Type

Cooling/Heating/Inverter

A~Z

A~Z

4, 5

6

Capacity

Electric Range

Chassis

Look

Function

0~9

1~9

A~Z

A~Z

A~Z

A~Z

10 Serial No.

1~9



S: Split Type Air Conditioner

C: Cooling Only

H: Heat Pump

X: C/O + E/Heater

Z: H/P + E/Heater

V: AC Inverter C/O

N: AC Inverter H/P

Q: DC Inverter C/O

W: DC Inverter H/P

Cooling/Heating Capacity

Ex. "09"

→ 9,000 Btu/h

1: 115V/60Hz

2: 220V/60Hz

3: 208-230V/60Hz

5: 200-220V/50Hz

6: 220-240V/50Hz

7: 110V, 50/60Hz

Name of Chassis

Look,

Color (Artcool Model)

Basic

Basic+4Way

Basic + Filter (Carbon filter)

Plasma+(A/changeove)+A/clean+2Way + Ion

Plasma+(A/changeove)+A/clean+4way + Ion + Lamp

Plasma+(A/changeove)+A/clean+Low A

Plasma+(A/changeove)+A/clean+4way+Low A

Plasma+(A/changeove)+A/clean

Plasma+(A/changeove)+A/clean+4way

Plasma+(A/changeove)+A/clean+PTC

Plasma+(A/changeove)+Autoclean+4way+PTC

Plasma+(A/changeove)+A/clean+4way+Low A+PTC

Smart(Robot) Cleaning

Eco eye + Plasma + Allergy Filter + 4way

Plasma + Allergy Filter + 4way

Allergy Filter + 4way

Allergy Filter + 2way

Basic + Low Ambient

Basic+(A/clean)+4way+Low A

LG Model Development Serial No.

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Q

R

S

U

L

M

N

P

V

W

Y

Z

F

G

H

C

E

A

B

Part 2 Functions & Controls

1. List of Controls & Functions ..........................................................................................9

2. Basic Mode Controls......................................................................................................10

3. Special Mode Controls...................................................................................................12

4. Utility Functions .............................................................................................................13



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Part 2 Functions & Controls

1. List of Functions & Controls

Category

Basic mode controls

Function

Cooling Mode

Heating Mode

Healthy Dehumidification

Auto Changeover

Special Mode controls

Jet Cool

Jet Heat

Energy saving

Forced operation

Auto Clean

Utility Functions

Air volume control

Natural Air control

Auto Swing

Sleep mode Auto control

Auto Restart Function

Description

Cooling operation

Heating operation

Dry operation

Cooling mode is automatically changed to heating mode and vice verse

Powerful cooling mode

Powerful heating mode

Air volume & set temp. are automatically selected for saving energy in cooling mode

Operation without remote controller

After cooling operation, this function makes the evaporator dry

Indoor Fan speed Control

Air volume control Program

Vertical Airflow Direction control

Air volume & set temp. are automatically changed for comfortable sleep

When power returns after a power failure, Unit restarts in the previous operating mode

Remark

NOTE: The Exploded View SVC Manual has the particular Function table for each model.



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2. Basic Mode Controls

2.1 Cooling Mode

+0.5

°C(1°F)

Setting

Temp.

-0.5

°C(-1°F)

Thermo ON

Thermo OFF

INV. Comp.

Frequency

High Low Comp. OFF High Low

• Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions.

• If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 90 seconds. ( not emergency conditions)

• Compressor turned off when

- Intake air temperature reaches below 0.5°C(1°F) of the setting temperature for three minute continuously.

- Intake air temperature reaches below 1.5°C(3°F) of the setting temperature

• Compressors 3 minute time delay.

- After compressor off, the compressor can restart minimum 3 minute later.

2.2 Heating Mode

4˚C(˚F)

2˚C(3.6˚F)

Setting

Temp.

INV. Comp.

Frequency

High Low Comp. OFF High Low Comp. OFF

Thermo OFF

Thermo ON

• Operating frequency of compressor depend on the load condition, The difference between the room temp. and set temp., frequency restrictions.

• If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 90 seconds.

• Condition of compressor turned off

- When intake air temperature reaches 4°C(°F) above the setting temperature.

• Condition of compressor turned on

- When intake air temperature reaches below 2°C(3.6°F) of above the setting temperature.

* Condition of indoor fan turned off

• While in defrost control, the indoor and outdoor fans are turned off.

• Compressor 3 minut delay

- After compressor off, the compressor can restart minimum 3 minute later.



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2.3 Healthy Dehumidification operation

• When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the setting temp. is automatically set according to the intake air temperature.

Setting Temp.

Intake air Temp.

26°C(78.8°F)

≤ intake air temp.

24°C(75.2°F)

≤ intake air temp.< 26°C(78.8°F)

22°C(71.6°F)

≤ intake air temp. < 24°C(75.2°F)

18°C(64.4°F)

≤ intake air temp. < 22°C(71.6°F) intake air temp. < 18°C(64.4°F)

25°C(77°F) intake air temp. -1°C(-2°F) intake air temp. -0.5°C(-1°F) intake air temp.

18°C(64.4°F)

• When intake air temp. is 1 C(2 F) above the setting temp., condition of compressor is same as in cooling mode operation.

• When intake air temperature reaches 1 C(2 F) below the setting temp., compressor operates in step1~step3 and the indoor fan speed again operates at low speed or comes to a stop.

2.4 Auto changeover operation

• The air conditioner changes the operation mode automatically to keep indoor temperature steady.

• When room temperature vary over ±2°C(±4°F) with respect to setting temperature, air conditioner keeps the room temperature in ±2°C(±4°F) with respect to setting temperature by changing the mode from cooling to heating and vice versa.

Switching point

Heating thermo off

+4

°C(+8°F)

+2

°C(+4°F)

+0.5

°C(+1°F)

Setting

Temp.

-0.5

°C(-1°F)

-2

°C(-4°F)

Mode

Cooling operation

Heating operation

Cooling operation

Cooling thermo off

Switching point



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3. Special Mode Controls

3.1 Jet Cool operation

• In the heating mode or Auto Changeover operation, the Jet cool function does not work.

When it is input while in other mode of operation (cooling, dehumidification, Air purification, Air circulation), the Jet cool operation takes place.

• In the Jet cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation.

• In the Jet cool mode, the room temperature is maintained at a setting temperature of 18°C(64.4°F).

• When the sleep timer mode is input during the Jet cool operation, the Jet cool mode has the priority.

• When the Jet cool button is pressed, the horizontal vane of the unit is reset to those of the initial cooling mode and then operate so that the air outflow could reach further.

3.2 Jet Heat operation

• While in cooling mode or Auto Changeover operation, the Jet Heat function does not work.

When it is input while in the Heating mode operation (dehumidification), the Jet Heat mode operation takes place

• In the Jet Heat mode, the indoor fan operated at super-high speed for 60 min. at Heating mode operation.

• In the Jet Heat mode, the room temperature is maintained at a temperature of 30°C(86°F).

• When the sleep timer mode is input during the Jet Heat mode operation, the Jet Heat mode has the priority.

• When the Jet Heat button is pressed, the horizontal vane of the unit is the unit reset to those of the initial Jet heating mode and then operates so that the air outflow could reach under flow.

3.3 Energy saving operation in cooling mode

• During cooling and dehumidification mode of operation, the Energy saving button can be input.

• In this operation, before we feel cold the set temperature and air volume is set automatically to save energy.



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4. Utility Functions

4.1 Forced operation

• To operate the appliance manually in case when the remote control is lost, the forced operation selection switch is on the main unit of the appliance, and operate the appliance in the standard conditions.

• The operating condition is set according to the outdoor temp. and intake air temperature as follows.

Indoor temp.

Operating Mode Setting temp.

Setting speed of indoor fan

over 24°C(75.2°F)

21~24°C(69.8~75.2°F) below 21°C(69.8°F)

Cooling

Healthy Dehumidification

Heating

22°C(71.6°F)

23°C(73.4°F)

24°C(75.2°F)

High speed

• Operating procedures when the remote control can't be used is as follows :

- The operation will be started if the ON/OFF button is pressed.

- If you want to stop operation, re-press the button.

- The ON/OFF switch is on the display PCB or side of indoor unit

4.2 Auto cleaning operation

• Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor.

• Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next operation.

• The function is easy to operate as it is accessed through the Remote controller.

ON OFF

Comp.

Indoor Fan

Cooling CYCLE

ON

Setting Step

Fan

30 Min

OFF

Super Low



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4.3 Air volume control

• UIndoor fan motor control have 6 steps or 8 steps.

• UAir volume is controlled "SH", "H", "MH", "M", "ML", "L" by the remote controller.

• "SL" step is selected in "Sleep Mode" operation.

4.4 Natural Air Control(Natural Wind)

• When the Auto Step is selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec. randomly by the Chaos Simulation.

Step

MH

H

SH

Auto

SL

L

ML

M

Description

Super Low

Low

Medium-Low

Medium

Medium-High

High

Super High

Natural Wind

4.5 Auto Swing

• By the Auto swing key input, the horizontal vane automatically operates with the Auto swing or it is fixed to the desired direction.

4.6 Sleep mode Auto control

• When the set sleep time is reached set time of [1,2,3,4,5,6,7hour] input by the remote control during the operation, the operation of the appliance stops.

• When the appliance is on pause, the sleep timer mode cannot be input.

4.6.1 Sleep timer operation for cooling cycle

• While in cooling mode , 30 min. after the start of the sleep timer, the setting temperature increases by 1 C(2 .

After another 30minutes lapse, it increases again by 1°C(2 .

Setting temp. (˚C)

1.0˚C(2˚F) up

1.0˚C(2˚F) up

Cooling ON temp.

(Setting temp. +0.5˚C(+1˚F))

Cooling OFF temp.

(Setting temp. -0.5˚C(-1˚F))

0.5

1 Sleep time (hour)

NOTE: Some Models are different by swing width and swing pattern.



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4.6.2 Sleep timer operation for heating cycle

• While in heating mode, 60 min. after the start of the sleep timer, the setting temperature decreases by 1 C(2 .

After another 60minutes lapse, it decreases again by 1°C(2 .

Setting temp. (

°C)

Heating ON temp.

(Setting temp)

Heating OFF temp.

(Setting temp. +4.0

°C(+8°F))

1.0

°C(2°F) down

1.0

°C(2°F) down

1 2 Sleep time (hr)

4.7 Auto restart

• When the power comes back after a sudden power failure during operation, the mode before the power failure is kept on the memory of the appliance and it automatically operates in the saved mode on the memory.

• Operation mode that is kept on the memory

- State of operation ON/OFF

- Operation mode/setting temp./selected airflow speed

- Sleep timer mode/remaining time of sleep timer

- Auto Swing



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Part 3 Test Run

Part 3 Test Run

1. Check before Test Run...................................................................................................17

2. Test Run Flow chart .......................................................................................................18

3. Test Run Detail................................................................................................................19



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Part 3 Test Run

1. Check before Test Run

1

2

3

Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly.

Check whether the liquid pipe and gas pipe valves are fully opened.

NOTE: Be sure to tighten caps.

Confirm that 500 V megger shows 2.0 M

Ω or more between power supply terminal block and ground. Do not operate in the case of 2.0 M

Ω or less.

NOTE: Never carry out mega ohm check over terminal control board.

Otherwise the control board may break.

Immediately after mounting the unit or after leaving it turned off for an extended length of time, the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx. 2.0 M

Ω as a result of refrigerant accumulation in the internal compressor.

If the insulation resistance is less than 2.0 M

Ω, turn on the main power supply.



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Part 3 Test Run

2. Test Run Flow chart

START

Test operation for indoor unit

Operate the unit in cooling mode.

Does Test operation start?

Yes

Is cold air discharged for more than 3 minutes ?

Yes

Is there any temperature difference between intake and discharged air?

Yes

Is the operating current normal ?

Yes

Operation mode change to Heating mode

No

No

No

No

Refer to part4, 7 Electric part

Refer to part4, 5 Cycle part

* Check the load (In/Out Temp.)

* Check pipe length and amount of

refrigerant

* Check for abnormal sound in

outdoor unit (comp.,Fan, others )

Is hot air discharged ?

After Hot Start

Yes

Normal

No

Refer to Troubleshooting

Guide

NOTE: When outdoor temperature is low,the unit is operated to Heating mode



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Part 3 Test Run

3. Test Run Detail

1. Check that all tubing and wiring have been properly connected.

2. Check that the gas and liquid side service valves are fully open.

Settlement of outdoor unit

• Anchor the outdoor unit with a bolt and nut(ø10mm) tightly and horizontally on a concrete or rigid mount.

• When installing on the wall, roof or rooftop, anchor the mounting base securely with a nail or wire assuming the influence of wind and earthquake.

• In the case when the vibration of the unit is conveyed to the hose, secure the unit with an anti-vibration bushing.

Bolt

Tubing connection

Evaluation of the performance

Operate unit for 15~20 minutes, then check the system refrigerant charge:

1. Measure the pressure of the gas side service valve.

2. Measure the temperature of the intake and discharge air.

3. Ensure the difference between the intake temperature and the discharge is more than 8°C(46°F) (Cooling) or

(Heating).

Intake temperature

Discharge air

NOTE: If the actual pressure is higher than shown, the system is most likely over-charged, and charge should be removed.

If the actual pressure are lower than shown, the system is most likely undercharged, and charge should be added.

The air conditioner is now ready for use.

PUMP DOWN

This is performed when the unit is to be relocated or the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant in the outdoor unit without loss in refrigerant gas.

CAUTION:

Be sure to perform Pump Down procedure with the unit in cooling mode.

Pump Down Procedure

1. Connect a low-pressure gauge manifold hose to the charge port on the gas side service valve.

2. Open the gas side service valve halfway and purge the air from the manifold hose using the refrigerant gas.

3. Close the liquid side service valve(all the way in).

4. Turn on the unit's operating switch and start the cooling operation.

5. When the low-pressure gauge reading becomes 1 to

0.5kg/cm 2 G(14.2 to 7.1 P.S.I.G.), fully close the gas side valve stem and then quickly turn off the unit. At that time,

Pump Down has been completed and all refrigerant gas will have been collected in the outdoor unit.

5. Check operating current.

6. Change operation mode and check.

Discharge temperature

4. For reference; the gas side pressure of optimum condition is as below.(Cooling)

Refrigerant

Outside ambient

TEMP.

The pressure of the gas side service valve.

R22 35°C (95°F) 4~5kg/cm 2 G(56.8~71.0 P.S.I.G.)

R410A 35°C (95°F) 8.5~9.5kg/cm 2 G(120~135 P.S.I.G.)



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Part 4 Trouble Shooting

Part 4 Trouble Shooting

1. 2-Way, 3-Way Valve ........................................................................................................21

2. Pumping Down ..............................................................................................................22

3. Evacuation (All amount of refrigerant leaked) ............................................................23

4. Gas Charging (After Evacuation) .................................................................................24

5. Cycle Troubleshooting Guide........................................................................................25

6. Electronic Parts Troubleshooting Guide ......................................................................26

7. Self-diagnosis Function.................................................................................................30



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1. 2-Way, 3-Way Valve

2-way Valve (Liquid Side)


3-way Valve (Gas Side)

Hexagonal wrench (4mm)

Flare nut

Open position

Closed position

To piping connection

To outdoor unit

Flare nut

Valve cap

Open position

Closed position

Pin

To piping connection

Service port cap

To outdoor unit

Service port

Works

Shipping

1.

Air purging

(Installation)

Operation

2.

Pumping down

(Transfering)

3.

Evacuation

(Servicing)

4.

Gas charging

(Servicing)

5.

6.

Pressure check

(Servicing)

Gas releasing

(Servicing)

Shaft position

Closed

(with valve cap)

Open

(counter-clockwise)

Open

(with valve cap)

Closed

(clockwise)

Open

Open

Open

Open



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Shaft position

Closed

(with valve cap)

Closed

(clockwise)

Open

(with valve cap)

Open

Open

(push-pin or with vacumm pump)

Closed

(with cap)

Open Open

(counter-clockwise) (connected manifold gauge)

Open

(with charging cylinder)

Open

Service port

Closed

(with cap)

Open

Open

Open


Open


Open




2. Pumping Down

Indoor unit

Liquid side

2-Way valve

Open

Gas side

3-Way valve

Closed

Outdoor unit

CLOSE

Purge the air

Lo

CLOSE

• Procedure

(1) Confirm that both the 2-way and 3-way valves are set to the open position.

– Remove the valve stem caps and confirm that the valve stems are in the raised position.

– Be sure to use a hexagonal wrench to operate the valve stems.

(2) Operate the unit for 10 to 15 minutes.

(3) Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve.

– Connect the charge hose with the push pin to the service port.

(4) Air purging of the charge hose.

– Open the low-pressure valve on the charge set slightly to air purge from the charge hose.

(5) Set the 2-way valve to the closed position.

(6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates

1kg/cm 2

.g.

(7) Immediately set the 3-way valve to the closed position.

– Do this quickly so that the gauge ends up indicating 3 to 5kg/cm 2

.g.

(8) Disconnect the charge set, and mount the 2way and 3-way valve’s stem nuts and the service port nut.

– Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.



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3. Evacuation (All amount of refrigerant leaked)


Indoor unit

Liquid side

3-Way valve

Open

Outdoor unit

Gas side

Vacuum pump

OPEN

Lo

OPEN

Vacuum

Gage

3-Way valve

Open

• Procedure

(1) Connect the vacuum pump to the center hose of charge set center hose

(2) Evacuation for approximately one hour.

– Confirm that the gauge needle has moved toward 0.8 Torr.

(3) Close the valve (Lo side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

(4) Disconnect the charge hose from the vacuum pump.

– Vacuum pump oil.

If the vacuum pump oil becomes dirty or depleted, replenish as needed.



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4. Gas Charging (After Evacuation)

Indoor unit

Liquid side

3-Way valve

Open Outdoor unit

Gas side

3-Way valve

Open

Check valve

Charging cylinder

(1)

OPEN

Lo

CLOSE

Vacuum

Gage

• Procedure

(1) Connect the charge hose to the charging cylinder.

– Connect the charge hose which you dis-connected from the vacuum pump to the valve at the bottom of the cylinder.

– If you are using a gas cylinder, also use a scale and reverse the cylinder so that the system can be charged with liquid.

(2) Purge the air from the charge hose.

– Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air. (Be careful of the liquid refrigerant). The procedure is the same if using a gas cylinder.

(3) Open the valve (Lo side on the charge set and charge the system with liquid refrigerant.

– If the system can not be charged with the specified amount of refrigerant, it can be charged with a little at a time (approximately 150g each time) while operating the air conditioner in the cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the procedure (pumping down-pin).

This is different from previous procedures.

Because you are charging with liquid refrigerant from the gas side, absolutely do not attempt to charge with larger amounts of liquid refrigerant while operating the air conditioner.

(4) Immediately disconnect the charge hose from the 3-way valve’s service port.

– Stopping partway will allow the gas to be discharged.

– If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose.

(5) Mount the valve stem nuts and the service port nut.

– Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.



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5. Cycle Troubleshooting Guide

Trouble analysis

1. Check temperature difference between intake and discharge air, and operating current.

Temp. difference : approx. 0°C(1°F)

Current : less than 80% of rated current

All amount of refrigerant leaked out.

Check refrigeration cycle.

Temp. Difference

Temp. difference

Current

: approx. 8°C(16°F)

: less than 80% of rated current

Refrigerant leakage

Clog of refrigeration cycle

Defective compressor

Operating Current

Temp. difference

Current

: less than 8°C(16°F)

: near the rated current

Excessive amount of refrigerant

Temp. difference : over 8°C(16°F) Normal

NOTICE

Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower temperature difference is larger.



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6. Electronic Parts Troubleshooting Guide

Trouble 1

The Product doesn’t operate at all. (9~30kBtu/h Model)

Turn off the main power and wait until LED on outdoor PCB is off.

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?

Does "Lighting" LED is mounted on the outdoor PCB?

NO YES

• Primarily, the operating condition of Micom is O.K.

Check the voltage of power(AC 208~230V, 60Hz).

• The voltage of main power.

• The voltage applied to the unit.

• The connecting method of Indoor/Outdoor connecting cable (each color)

• The P.W.B. Ass'y

(Fuse,Noise Filter, Power Module(SMPS), IC01D,IC04D)

• Check CN-DISP1

The operation check of the P.C.B. Ass'y

Procedure

1) The input voltage of Power

Module(SMPS)

2) The output voltage of Power

Module (SMPS)

3) IC01D(LD1085), IC04D(7805)

: DC 220V~390V

: 15V

: DC 5V

Specification

10%

Remedy

Replace the P.C.B.



- 26 -


Trouble 2


Product doesn't operate with the remote controller.

Turn on main power.

While the compressor has been stopped, the compressor does not operate owing to the delaying function for 2 minutes after stopped.

When the compressor stopped Indoor Fan is driven by a low speed.

At this point the wind speed is not controlled by the remote controller.

(When operated in the Sleeping Mode, the wind speed is set to the low speed as force).)

Caused by the remote controller.

Caused by other parts except the remote controller

When the mark ( ) is displayed in LCD screen, replace battery.

Check the contact of CN-DISP 1, 2 connector

Check DISP P.C.B Ass'y

-Voltage between CN-DISP1 : DC +5V

Check point

• Check the connecting circuit between

MICOM PIN and CN-DISP1 PIN

• Check receiver ass'y



- 27 -



Trouble 3

The Compressor/Outdoor Fan don't operate

Turn on the main power.

Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least.

When in air circulation mode, compressor/outdoor fan is stopped.

Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.)

When displaying Error code, refer to the trouble shooting guide.

Check the main power source.(AC 208V~230V)

Check the trouble shooting guide error code 21,26.

Check that CN_FAN(A,B) supplied voltage to outdoor PCB is about AC 208V~230V.

Turn off main power.

Check the electrical wiring diagram of Outdoor side.

Check the open or short of connecting wires between Indoor and Outdoor.



- 28 -



Trouble 4

When indoor Fan does not operate

Turn off main power.

Check the connection of CN-FAN.

Check the Fan Motor.

Check the Fuse(AC250V, T2A).

Check the related circuit of indoor Fan Motor.

• The pin No.

38 of micom and the part for driving SSR.(Q01M)

• Check the related pattern.

• Check the SSR.

- SSR Open: Indoor Fan Motor never operate.

- SSR short: Indoor Fan Motor always operates in case of ON or OFF.

Turn on the main power

Check the SSR high speed operation by remote control.

(the Indoor Fan Motor is connected)

The voltage of Pin No 1(orange) and 3(black) of CN-FAN.

About AC 160V over

SSR is not damaged

About AC 50V over

Check SSR



- 29 -



7. Self-diagnosis Function

■ Error Indicator

• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.

• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.

• After error occurrence, if error is released, error LED is also released simultaneously.

• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.

• Having or not of error code is different from Model.

■ Indoor Unit Error

1. SB, SC, SH, S4, S5 Chassis

Error

Code

Description

1

2

5

6

Indoor Sensor(Air) open/short

Indoor Sensor(Entry Pipe) open/short

Communication Failure(Indoor Unit

↔ Outdoor Unit)

Indoor Sensor(Exit Pipe) open/short

9 EEPROM ERROR(Indoor Unit)

10 Indoor Unit Fan Lock(Operation Failure)

12 Indoor Sensor(Middle Pipe) open/short

Indoor Unit

Error Indication

Outdoor Unit

LED1 LED2

LED1

(Red)

LED2

(Green)

1 Time

2 Times

5 Times

6 Times

9 Times

-

2 Times

-

-

-

-

-

1 Time

1 Time

-

-

-

-

-

-

-

-

-

-

-

-

-

-

1) SB, SC, Chassis 2) S4, S5 Chassis (4 LED Model)

LED1

(1 Digit)

LED2

(10 Digit)

LED1

(1 Digit)

LED2

(10 Digit)

3) SH Chassis

2. SE Mirror, S8, SD Chassis

Ex) Error Code 5 (Communication Failure)

1 Digit

10 Digit



- 30 -



■ Outdoor Unit Error

1) 2 LED Type

LED1

(Green, 1 Digit)

LED2

(Red, 10 Digit)

2) 1 LED Type

Red LED

Ex) Error Code 21 (DC Peak)

1sec 2sec 1sec 2sec 1sec 2sec 1sec 2sec

Error

Code

Description

21 DC Peak (IPM Fault)

22 CT 2(Max CT)

23 DC Link Low Volt

25 Low wire volt/ high wire volt

26 DC Comp Position Error

27 PSC Fault Error

28 DC Link High Volt

29 Inverter Compressor over-current

31 CT error (low current)

32 D-Pipe High (INV)

40 CT Sensor (Open / Short)

41 INV. D-Pipe Th Error (Open / Short)

44 Outdoor Air Th Error (Open / Short)

45 Cond. Middle Pipe Error (Open / Short)

48 Cond. Out Pipe Error (Open / Short)

53 Communication Failure(Outdoor Unit

↔ Indoor Unit)

60 EEPROM Check Sum Error

61 Cond. Pipe High

62 Heatsink High

63 Cond. Pipe Low

65 Heatsink Th Error (Open/Short)

Indoor Unit

Error Indication

Outdoor Unit

LED1 LED2 LED1 LED2

4 Times

4 Times

4 Times

4 Times

4 Times

5 Times

6 Times

6 Times

6 Times

6 Times

6 Times

2 Times

2 Times

2 Times

2 Times

2 Times

2 Times

2 Times

2 Times

3 Times

3 Times

-

1 Time

4 Times

5 Times

8 Tiems

3 Times

-

1 Time

2 Times

3 Times

5 Times

1 Time

2 Times

3 Times

5 Times

6 Times

7 Times

8 Tiems

9 Times

1 Time

2 Times

4 Times

4 Times

4 Times

4 Times

4 Times

5 Times

6 Times

6 Times

6 Times

6 Times

6 Times

2 Times

2 Times

2 Times

2 Times

2 Times

2 Times

2 Times

2 Times

3 Times

3 Times

-

1 Time

4 Times

5 Times

8 Tiems

3 Times

-

1 Time

2 Times

3 Times

5 Times

1 Time

2 Times

3 Times

5 Times

6 Times

7 Times

8 Tiems

9 Times

1 Time

2 Times



- 31 -



■ Troubleshooting Guide (Indoor Unit)



- 32 -




- 33 -




- 34 -


■ Trouble Shooting Guide [Outdoor Unit (2 LED Type)]

1) CH21: DC Peak Error



- 35 -




- 36 -


2) CH22: CT2 Error (Input Over-current)



- 37 -


3) CH23: DC Link Low Voltage Error



- 38 -


4) CH26: DC Comp Location Sensing Error



- 39 -


5) CH27: PSC Fault Over-current Error



- 40 -


6) CH29: Compressor phase Over-current Error (only verifiable at Outdoor unit PCB Assembly)



- 41 -


7) CH32: Inverter Compressor D-Pipe Overheat Error



- 42 -


8) CH40: CT Sensor Error (Open/Short)

Tester

Tester



- 43 -


9) CH41/44/45/65: Inv D-Pipe/Outdoor Inlet/Cond. Pipe/Heat sink Sensor Error



- 44 -


10) CH53: Outdoor Unit <-> Indoor Unit Communication Error



- 45 -


11) CH60: Outdoor Unit PCB EEPROM Error



- 46 -


12) CH61: Cond. Pipe Overheat Error



- 47 -


13) CH62: Heat Sink Overheat Error



- 48 -


14) CH67: Outdoor BLDC Fan Lock Error



- 49 -


■

Trouble Shooting Guide [Outdoor Unit(1 LED Type)]

1) CH21: DC Peak Error



- 50 -


Resistance between the lines of each

U - V

V - W

W - U

1.5 ~ 2

Ω

1.5 ~ 2

Ω

1.5 ~ 2

Ω



- 51 -


2) CH22: CT2 Error (Input Over-current)



- 52 -


3) CH23: DC Link Low Voltage Error



- 53 -


4) CH26: DC Comp Location Sensing Error



- 54 -


5) CH29: Compressor phase Over-current Error (only verifiable at Outdoor unit PCB Assembly)



- 55 -


6) CH32: Inverter Compressor D-Pipe Overheat Error



- 56 -


7) CH40: CT Sensor Error (Open/Short)

Is AC input current sensing part normal?

Check voltage measurement on the input current (Fig.1) at the power-on standby state DC 0V ± 0.2V

Is the Comp phase Current sensor part normal?

DC voltage measurement at the measurement point in figure 2 at power-on standby state -> measured value : within 2.5V ± 0.2V



- 57 -


8) CH41/44/45/65: Inv D-Pipe/Outdoor Inlet/Cond. Pipe/Heat sink Sensor Error



- 58 -


9) CH53: Outdoor Unit <-> Indoor Unit Communication Error



- 59 -


10) CH60: Outdoor Unit PCB EEPROM Error



- 60 -


11) CH61: Cond. Pipe Overheat Error



- 61 -


12) CH62: Heat Sink Overheat Error

Are the PCB temperature sensing parts normal?



- 62 -


13) CH67: Outdoor BLDC Fan Lock Error



- 63 -


P/NO : MFL41161605 NOVEMBER, 2009

Room Air Conditioner SVC MANUAL(General)

Room Air Conditioner

SVC MANUAL(General)

MODEL : General Wall Mounted-Inverter Type

CAUTION

Air Conditioner Service Manual

CONTENTS

Part 1 General Information

1. Safety Precautions

1.1 Cautions in Repair

1.2 Inspections after Repair

2. Nomenclature

2.1 Global Model Name

A S W 1 2 6 B M S 0

Part 2 Functions & Controls

1. List of Functions & Controls

2. Basic Mode Controls

2.1 Cooling Mode

2.2 Heating Mode

2.3 Healthy Dehumidification operation

2.4 Auto changeover operation

3. Special Mode Controls

3.1 Jet Cool operation

3.2 Jet Heat operation

3.3 Energy saving operation in cooling mode

4. Utility Functions

4.1 Forced operation

4.2 Auto cleaning operation

4.3 Air volume control

4.4 Natural Air Control(Natural Wind)

4.5 Auto Swing

4.6 Sleep mode Auto control

4.7 Auto restart

Part 3 Test Run

1. Check before Test Run

1

2

3

2. Test Run Flow chart

3. Test Run Detail

Part 4 Trouble Shooting

1. 2-Way, 3-Way Valve

2. Pumping Down

3. Evacuation (All amount of refrigerant leaked)

4. Gas Charging (After Evacuation)

5. Cycle Troubleshooting Guide

NOTICE

6. Electronic Parts Troubleshooting Guide

Trouble 1

Trouble 2

Trouble 3

Trouble 4

7. Self-diagnosis Function

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LG

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LG

LM-1860HL

LG

PRHR040

LG

AS-H076PB/D/M/WL1

LG

AS-W126URH1/UBH1/UWH1/UMH1

Table of contents