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LG
LG
Multi Type Air Conditioner
SERVICE MANUAL
MODEL: Indoor Unit: Wall Mounted Type
TMNC092DYAA(M092CD)
TMNC122DYAA(M122CD)
Outdoor Unit: T2UC182FAA(M182CX)
T2UC242FAA(M242CX)
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Multi Air Conditioner Service Manual
TABLE OF CONTENTS
Safety Precautions ......................................................................................................................................3
Product Specifications
...............................................................................................................................7
Dimensions ..................................................................................................................................................9
Refrigeration Cycle Diagram ....................................................................................................................12
Wiring Diagram ..........................................................................................................................................13
Electronic Control Device .........................................................................................................................14
Schematic Diagram ...................................................................................................................................17
Functions ...................................................................................................................................................19
Operation Details ......................................................................................................................................22
Disassembly ..............................................................................................................................................26
2-way, 3-way Valve ....................................................................................................................................29
Cycle Troubleshooting Guide
..................................................................................................................33
Installation .................................................................................................................................................39
Flaring work and connection of piping
...................................................................................................42
Connecting the Cable Between Indoor Unit and Outdoor Unit
Exploded View and Replacement Parts List
2 Multi Air Conditioner
.............................................................47
...........................................................................................49
Safety Precautions
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.
WARNING
This symbol indicates the possibility of death or serious injury.
CAUTION
This symbol indicates the possibility of injury or damage.
Meanings of symbol used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
WARNING
Installation
Do not use a defective or
underrated circuit breaker.
Use this appliance on a dedicated circuit.
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.
• There is risk of fire or electric shock.
• Moisture may condense and wet or
damage furniture.
• There is risk of fire or electric shock.
Install the panel and the cover
of control box securely.
Always install a dedicated circuit and breaker.
Use the correctly rated breaker or fuse.
• There is risk of fire or electric shock.
• Improper wiring or installation may
cause fire or electric shock
Always ground the product.
• There is risk of fire or electric shock.
Service Manual 3
Safety Precautions
Do not modify or extend the
power cable.
Do not install, remove, or reinstall the unit by yourself
(customer).
Be cautious when unpacking
and installing the product.
• There is risk of fire or electric shock.
• There is risk of fire, electric shock,
explosion, or injury.
• Sharp edges could cause injury. Be
especially careful of the case edges
and the fins on the condenser and
evaporator.
For installation, always contact the dealer or an
Authorized Service Center.
Do not install the product on a
defective installation stand.
Be sure the installation area
does not deteriorate with age.
• There is risk of fire, electric shock,
explosion, or injury.
• 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.
Operational
Do not touch(operate) the
product with wet hands.
• There is risk of fire or electrical shock.
4 Multi Air Conditioner
Do not place a heater or other
appliances near the power
cable.
Do not allow water to run into
electric parts.
• There is risk of fire and electric shock.
• It may cause There is risk of fire, failure of the product, or electric shock.
Safety Precautions
Do not store or use flammable gas or combustibles near the product.
• There is risk of fire or failure of product.
If strange sounds, or smell or smoke comes
from product. Turn the breaker off or disconnect the power supply cable.
• There is risk of electric shock or fire.
Gasolin
Do not open the inlet grille 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.
Be cautious that water could not enter the
product.
• There is risk of fire, electric shock, or product damage.
Service Manual 5
Safety Precautions
CAUTION
Installation
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.
Keep level even when
installing the product.
• To avoid vibration or water leakage.
90Û
Operational
Use two or more people to lift
and transport the product.
• Avoid personal injury.
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
• There is risk of personal injury.
damage to the plastic parts of the product.
x
Wa Thinner
Do not step on or put anyting on the product.
(outdoor units)
• There is risk of personal injury and failure of product.
6 Multi Air Conditioner
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.
Dimensions
Model : T2UC242FAA
L4
H
L3
L1
L9 L10 L10L10
L2
D
W
MODEL
DIM
L6
L5
L7
Gas side
3-Way valve
Liquid side
2-Way valve
L8
T2UC242FAA(M242CX)
W
mm
870
H
mm
655
D
mm
320
L1
mm
370
L2
mm
25
L3
mm
630
L4
mm
25
L5
mm
546
L6
mm
160
L7
mm
160
L8
mm
55
L9
mm
80
L 10
mm
50
Service Manual 11
Electronic Control Device
Electronic Control Device
Indoor Unit
• MAIN P.C.B ASM
• TOP VIEW
• BOTTOM VIEW
14 Multi Air Conditioner
Electronic Control Device
Outdoor Unit
Service Manual 15
Electronic Control Device
Display P.C.B ASM
16 Multi Air Conditioner
Vcc
1
RECEIVER
Vout
GND
C
A
R01G
R13L
100 1/4W
SW(FORCE)
C13L
104
DISPLAY ASM PCB : 6871A20574A
HVB
R01G~R04G
220 1/8W
R02G
LED2
SLEEP
LED1
OPERATION
R03G
LED3
TIMER
R04G
LED4
OUTDOOR
DISPLAY BARE PCB : 6870A90240A
PLASMA
A B C
B
DISPLAY
STEPPING MOTOR
(UP/DOWN)
7
7
2
1
1
1
2
1
5
4
3
7
7
8
5V
3
4
5
4
5
3
CN-12V
12V
C12L
220uF SD
10V
Q03G
KRA107S
Q02G
KRA107S
Q01G
KRA107S
4
3
2
1
1
8
1
2
3
4
5
6
7
8
10K
10K
10K
SDA
SCL
WP
Vcc
5
6
7
8
5V
AC PART
SMD
+ C05D
220
10V SD
CI-B2012-100KJT R/TP 100nH
L02D
20K
R02P
(2012)
5V
Force
5V
R15L
20K
C04D
104,AXAIL
50V
C03D
104,AXIAL
50V
12V
DC LOW
VOLTAGE GND
IC01D
S78L05L 1W
O
I
7805
5V
C14L
CHIP
103
R14L
1K
5V
R11H~R12H
20K,2012
EEPROM
M24C01-MN6T SGS-THOMSON 8PIN SOP TRAY EEPROM IIC
A0
A1
A2
G
20K
R01P
(2012)
C01P,AXIAL,103,50V
5V
47K
47K
47K
IC01G
KID65004AF
16
15
14
13
12
11
10
9
IC01M
KID65004AF
9
16
4
2
3
15
13
6
11
14
7
5
10
12
C03T
If CN-CENT don't use,this use resistor 10K(2012).
CHIP
102 or 10K ohm resistor
HVB OUT
12V
+
5V
12V
HVB OUT
COMP
INDOOR FAN
CN-L/R
2
3 4 5 6 7
8
R
X
D
T
X
D
A
V
d
d
1
A
V
s
s
B
Z
INT1
Vss1
INT0
AVref
AVdd
RESET
X2
X1
0J1H
R01D
4.7K
1/6W
C06J,AXIAL
222,400V
OPTION : noise character increasing thing
SMPS
1
158T
1-4 79T
4-3 79T
3
C05J
0.1uF
100V
Metal film
C04J
1uF
50V
+
R01B
1M
C09D
open
R21H
R02J
100,1/6W
DO6J
1N4937
RO1J
27K
1/4W,1%
+
DC LOW
VOLTAGE GND
IC01L
TLP421(V4 BL)
NTC SCK-102
INT
R03H,1/6W,10K
R01H,1/6W,10K
C01H
103
AXIAL
50V
5V
R01E
1K
3
4
R02H
12.1K
1%
R07H
6.2K
1%
R03A,100
R02A,4.7K
R04L,1/6W
12K
3
5V
5V
1
2
3.6V
R03L
27k
1/6W
5V
D05J
1N4007
1
D01L
1N4148
DC HIGH
VOLTAGE GND
2
R02L
300K
1/2W
Anti Surge Res.
R01L
300K
1/2W
Anti Surge Res.
D03J
1N4007
D01J
1N4007
INT
5V
receiver
5V
BZ01E
PKM13EPY-4002
Only no low temporature detection function.
R05H
10K
C02A
10uF
50V
R05L
56K
R12L 5.1K
R02E,20
R04H
6.2K
1%
R01A,1K
Q01L
KTC3198-Y
2SC5343
R21H~R26H
12.1K, 1%
C01L
AXIAL
103
50V
C01A
AXIAL
103
50V
R11L,1/6W
1K
R06H,1/6W,10K
5V
C03J
10uF
450V/SD
R26H
R25H
R24H
R23H
R22H
C02H
103
AXIAL
50V
DC HIGH
VOLTAGE GND
C
IC01J
LNK500P
LINK SWICH
D
S
15pF
15pF
C01T
CHIP(104) or 10K ohm resistor
R01T,1K,AXIAL
If CN-RF don't use,this use resistor 10K(2012).
C11L ,AXIAL
680pF,50V
OSC01B
CSTS0800MG03-T2
CRTL8.00MSOT
C03H
103
AXIAL
50V
R03D
0 ohm
5V
10M,1W,5% noise character increasing thing
Anti Surge Res.
R03J
DMR40 EE1916S
Lp=4.50mH,+-8%,40Khz
2UEW0.14
TIW0.25
28T
6
R02D
4.7K,1/6W
D01D
UF4004
GLASS TYPE
C06D,AXIAL
102,400V
+ C01D
220UF
25V
8
OR6H OR5H OR4H OR3H OR2H OR1H
F2
F1
Hi Med
Low O/L
C07D,AXIAL
103,50V
OPTION : noise character increasing thing
5V
R04D
0 ohm
C10D
open
33
36
35
34
38
37
42
41
40
39
44
43
47
46
45
48
IC02M
KID65004AF
17 18 1920 21 22 23 24 25 26 27 28 29 30 31 32
Vdd0
Vss0
L01D,IMD
ZBF503D-TA-K TDK TP 12uH
+ C02D
100uF
25V
1
NEC
UPD780023AGC-C
0J2H
12
13
14
15
16
7
8
9
10
11
1
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
OPTION : import or export operation option
R11H
R12H
103,50V
C08D,AXIAL
1
2
3
4
5
6
1
2
PK BL
2
16 15 14 13 12 11 10 9
3
3
5V
D02J
1N4007
D04J
1IN4007
IC01A
KIA7036P
S7136
R01F
560
1/4W
C02J
METAL FILM
100nF/275V/436D
INDOOR FAN
12V
OR6H (PIN 28)
OR5H (PIN 29)
OR4H (PIN 30)
OR3H (PIN 31)
OR2H (PIN 32)
3
2
1
6
10K+-5%
GND
5K+-5%
PIPE-TH
1
4
5
R02F
680
1/2W
C01J
METAL FILM
100nF/275V/436D
NF01J
40mH/1A
P/no:6200JB8010P WRAC APPLIED
R03F
100,1/2W
IC01F
TLP762JF
3
2
ZNR01J
TVR10561
FUSE
250V/T2A
TR01F
TRAICS
T1SM1L43
T2
OR6H
OR5H
OR4H
OR3H
OR2H
OR1H
ZNR01F
TVR10561
WIRE-N
NOTE
RY-4 WAY
RY- FAN
4
4
CN-LIVE
3
3
CN-N1
CN-N2
2
1
1
1
1
1
2
1
3
2
3
1
3
2
1
3
FAN
4WAY
COMP
12V
CN-4WAY
YW396-03AV(YL)
on artworking,Eyelet pattern
3
2
PCB outside
1
Angle type
AC220~240V
50/60Hz
N
L
INDOOR
FAN
MOTOR
RELAY CONNECTION
CN-MOTOR
YW396-03AV(WH)
RY-COMP
G4A-1A-E-LG
3
4
2
Direct type
1
5
1
2
3
1
2
3
4
5
TERMINAL
4
1
2
2(N)
OUTDOOR
FAN MOTOR
COMPRESSOR
MOTOR
4-WAY
WIRE-N
1(L)
3
LOAD
COMP
4WAY
OUTDOOR FAN
L(AC)
CN-MOTOR
CN-4WAY
SH-CAPACITOR
2. The unit of undefined capacitors is uF.
1. The unit of undefined resistance is ohm, 1/8W, 5%.
Option : only This is applied the H/P SRAC.
C01F
METAL FILM
100nF/275V/436D
R04F
120, 1/2W
CN-LIVE
PTC-HEATER
RF
Transmitter
ROOM-TH
PWB:6870A90243A
PCB ASM : 6871A20577
5
6
4
7
5
4
7
3
2
3
1
2
1
2
3
4
3
2
1
1
1
2
3
4
CN-TH1
3
2
1
3
2
1
CN-RF
1
2
2
1
3
3
CN-P/O
CN-TH2
CN-OPTION
OR1H (PIN 33)
C02T
CHIP(681)
5V
12V
4
BARE PCB:6870A90238A
ASM PCB:6871A20572
3
2
1
1
2
3
3
1
2
2
1
CN-HVB
GND
2
2
TXD
3
RXD
Force
receiver
1
1
2
3
4
5
6
1
CN-CENT
1
2
3
4
5
6
7
8
CN-DISP1
1
3
2
1
3
4
5
6
2
4
5
6
7
CN-DISP2
5
4
3
2
1
CN-U/D
4
3
2
Option
2
4
3
4
3
2
5
7
7
5
8
6
8
6
1
3
1
2
4
5
6
3
4
5
6
RD
OR
YL
PK
BL
12V
4
5
5
RD OR YL
FAN
STEPPING MOTOR
(LEFT/RIGHT)
4WAY
DC PART
4
3
Option
Schematic Diagram
Schematic Diagram
Indoor Unit
Service Manual 17
Schematic Diagram
18
Multi Air Conditioner
Functions
Function of Indoor Unit
Wall mounted type
Operation ON/OFF by Remote controller
Sensing the Room Temperature
• Room temperature sensor. (THERMISTOR)
Room temperature control
• Maintains the room temperature in accordance with the Setting Temp.
Starting Current Control
• Indoor fan is delayed for 5 seconds at the starting.
Time Delay Safety Control
• Restarting is inhibited for approx. 3 minutes.
Indoor Fan Speed Control
• High, Med, Low, Chaos
Operation indication Lamps (LED)
--- Lights up in operation
--- Lights up in Sleep Mode
--- Lights up in Energy Saving Mode
--- Lights up in Defrost Mode(for Heating model)
OUT
DOOR
--- Lights up in Compressor operation(for Cooling model)
Health Dehumidification Operation
• Intermittent operation of fan at low speed.
Sleep Mode Auto Control
• The fan is switched to low(Cooling), med(Heating) speed.
• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
Natural Air Control by CHAOS Logic
• The fan is switched to intermittent or irregular operation
• The fan speed is automatically switched from high to low speed.
Airflow Direction Control
• The louver can be set at the desired position or swing
up and down automatically.
Service Manual 19
Functions
Remote Controller
Operation ON/OFF
Operation Mode Selection
Cooling Operation Mode.(
(Cooling
model only)
)
Healthy Dehumidification Operation Mode.(
) Heating Operation Mode.(
Fan Speed Selection
(Low)
(Med)
(High)
Energy Saving Mode
Temperature Setting
TEMPERATURE
LOW
HIGH
Cooling
Down to 18°C
Up to 30°C
JET COOL
Sleep Operation
: Cancel Sleep Mode, Timer ON or Timer OFF
Airflow Direction Control
: 1, 2, 3, 4, 5, 6, 7, Off Timer
Fan Operation Mode
: Fan Operates without cooling or heating.
20 Multi Air Conditioner
(CHAOS)
)
Function
Display Function
Co o l i n g Mo d el
Operation Indicator
• Cooling, Soft Dry, Fan
Sleep Timer Indicator
• Sleep Mode
Energy Saving Mode
Compressor on Indicator
OUT
DOOR
Self-diagnosis Function
Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• 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 12, be sure to pull out power cord and then re-insert.
• Having or not of error code is different from Model.
Error
Code
1
Error Display LED
(Indoor body operation LED)
(once)
3sec
3sec
3sec
Error contents
• Indoor room temperature
thermistor open/short
• Indoor pipe temperature
thermistor open/short.
SVC check point
• Indoor Thermistor
assembly check
Service Manual 21
Operation Details
Operation Details
Function of Controls
• DISPL
AY
C/O Model
Operation Indicator
• ON while in appliance operation, OFF while in appliance pause.
•
Sleep Mode
Comp. Running Incidator
•
Energy Saving Mode
Cooling Mode Operation
• When the intake air temperature reaches0.5 °C below the setting temp, the compressorand the outdoor fan
stop.
• When itreaches0.5 °C above the setting temp, they start to operate again.
Setting Temp+0.5°C
Compressor ON Temp
Setting Temp-0.5°C
Compressor OFF Temp
• While in compressorrunning, operating with the
speedset by the remote control. While in compressor
Health
• When the
operation input by the remote control is received,the intake air temperature is
detected and the setting temp is automatically set according to the intake air temperature.
25°C
26°C ” Intake Air Temp
Intake Air Temp-1°C
24°C ” Intake Air Temp<26°C
Intake Air Temp-0.5°C
18°C ” Intake Air Temp<24°C
18°C
Intake Air Temp<18°C
•
• Whilethe intake air temp is between compressoron temp. and compressor temp.,10-min
Compressor ON Temp.
Compressor OFF Temp.
•
22 Multi Air Conditioner
Setting Temp+0.5°C
Setting Temp-0.5°C
Operation Details
Airflow Speed Selection
• The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input of the airflow
speed selection key on the remote control.
Sleep Timer Operation
• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops.
• While the appliance is on pause, the sleep timer mode cannot be input.
• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature
increases by 1°C. After another 30 min elapse, it increases by 1°C again.
• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to
the low.
• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to
the medium.
Chaos Natural Wind Mode
• When the Chaos Natural Wind mode 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.
Jet Cool Mode Operation (C/O Model)
• If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates.
• 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 operation, the room temperature is controlled to the setting temperature, 18°C
• When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.
• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then
operated in order that the air outflow could reach further.
Forced Operation
• Operation procedures when the remote control can't be used.
• The operation will be started if the power button is pressed.
• If you want to stop operation, re-press the button.
Cooling Model
Operating mode
Indoor FAN Speed
Setting Temperature
Cooling
High
22°C
Heat pump Model
Room Temp. • 24°C 21°C ” Room Temp. < 24 °C Room Temp. < 21 °C
Cooling
High
22°C
Healthy Dehumidification
High
23°C
Heating
High
24°C
• While in forced operation, the key input by the remote control has no effect and the buzzer sounds 10 times to
indicate the forced operation.
Test operation
• During the TEST OPERATION, the unit operates in cooling mode at high speed fan, regardless of room temperature and resets in 18±1 minutes.
• During test operation, if remote controller signal is received, the unit operates as remote controller sets.
If you want to use this operation, open the front panel upward and Press the power button let it be pressed for
about 3 seconds.
• If you want to stop the operation, re-press the button.
Service Manual 23
Operation Details
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.
Protection of the evaporator pipe from frosting
• If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cooling cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor
evaporator pipe from frosting.
• When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor and the
outdoor fan is turned on according to the condition of the room temperature.
Buzzer Sounding Operation
• When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.
• When the appliance-pause key is input by the remote control, the long "beep—" sounds.
24
Multi Air Conditioner
Operation Details
Remote Control Operations
The controls will look like the following.
Service Manual
25
Disassembly
Disassembly
Indoor Unit
Disconnect the unit from power supply before making any checks.
Be sure the power switch is set to “OFF ”.
To remove the Grille from the Chassis.
• Set the up-and-down air discharge louver to open
position (horizontally) by finger pressure.
• Remove the securing screws.
• To remove the Grille, pull the lower left and right
side of the grille toward you (slightly tilted) and lift it
straight upward.
1. Before removing the control box, be sure to
take out the wire screwed at the other end.
Earth
Conductor
26 Multi Air Conditioner
Disassembly
2. To remove the Control Box.
• Remove securing screws.
• Pull the control box out from the chassis
carefully.
Screw
3. To remove the Discharge Grille.
• Unhook the discharge grille and pull the
discharge grille out from the chassis carefully.
4. To remove the Evaporator.
• Remove 3 screws securing the evaporator(at the
left 2EA in the Eva Holder, at the right 1EA).
• When repair, do not damage the Caution label.
Service Manual 27
Disassembly
• Unhook the tab on the right inside of the chassis
at the same time, slightly pull the evaporator
toward you until the tab is clear of the slot.
5. To remove the Motor Cover
• Remove 2 securing screw.
• Pull the motor cover out from the chassis
carefully.
Motor cover
6. To remove the Cross-Flow Fan
• Loosen the screw securing the cross-flow fan to
the fan motor (do not remove).
• Lift up the right side of the cross-flow fan and the
fan motor, separate the fan motor from the
cross-flow fan.
Bearing
Cross-flow fan
• Remove the left end of the cross-flow fan from
the self-aligning bearing.
28 Multi Air Conditioner
2-way, 3-way Valve
2-way, 3-way Valve
2-way Valve (Liguid Side)
3-way Valve (Gas Side)
Valve cap
Flare nut
Hexagonal wrench
(4mm)
Open position
Closed position
To
piping
connection
Flare nut
Open position
Closed position
Pin
To
piping
connection
To outdoor unit
Service Service
port cap port
To outdoor unit
Works
Shaft position
Shaft position
Service port
Shipping
Closed
(with valve cap)
Closed
(with valve cap)
Closed
(with cap)
Air purging
(Installation)
Open
(counter-clockwise)
Closed
(clockwise)
Open
(push-pin or with
vacuum pump)
Operation
Open
(with valve cap)
Open
(with valve cap)
Closed
(with cap)
Pumping down
(Transfering)
Closed
(clockwise)
Open
(counter-clockwise)
Evacuation
(Servicing)
Open
Open
3.
Open
(with charging
cylinder)
Gas charging
(Servicing)
Open
Open
4.
Open
(with charging
cylinder)
Pressure check
(Servicing)
Open
Open
5.
Open
(with charging
cylinder)
Gas releasing
(Servicing)
Open
Open
6.
Open
(with charging
cylinder)
1.
2.
Open
(connected
manifold gauge)
Service Manual 29
2-way, 3-way Valve
(1) Pumping down
Liquid side
Indoor unit
2-Way
valve
Close
Outdoor unit
Gas side
3-Way
valve
Open
manifold gauge
Low-handle
(CLOSE)
Hi- handle
(CLOSE)
• Procedure
1. Confirm that both the gas side and liquid side
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 manifold gauge to the service port of
the gas side valve.
- Connect the hose of the gauge with the push
pin to the service port.
4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
5. Set the liquid side valve to the closed position.
30 Multi Air Conditioner
6. Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm g.
2
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indicating 1kg/
g.
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service
port nut.
- Use torque wrench to tighten the service port
nut to a torque of 1.8kg.m.(4.2kg*m/5.5kg*m)
- Be sure to check for gas leakage.
2-way, 3-way Valve
(2) Evacuation
(All amount of refrigerant leaked)
Indoor unit
Liquid side
2-Way
valve
Close
Outdoor unit
Gas side
3-Way
valve
Open
manifold gauge
Vacuum pump
Lowhandle
(OPEN)
Hi- handle
(CLOSE)
• Procedure
1. Confirm that both the liguid side valve and gas
side valve are set to the opened position.
7. Disconnect the charge hose from the vacuum
pump.
2. Connect the vaccum pump to the center hose of
the manifold gauge.
3. Connect the service port of the gas side valve to
the low side of the gauge.
4. Connect power supply to outdoor unit.
5. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or depleted,replenish as needed.
8. Mount the valve caps and the service port caps.
6. Close the Low handle of the gauge turn off the
vacuum pump, and confirm that the gauge needle does not move(approximately 5 minutes
after turning off the vacuum pump).
Service Manual 31
2-way, 3-way Valve
(3) Gas Charging
(After Evacuation)
Liquid side
Indoor unit
2-Way
valve
Close
Outdoor unit
Gas side
3-Way
valve
Charging
cylinder
Open
manifold gauge
Low-handle
Check valve (OPEN)
Hi- handle
(CLOSE)
• Procedure
1. Connect the gauge to the charging cylinder.
- Connect the charge hose which you disconnected 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 low handle on the gauge 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).
32 Multi Air Conditioner
4. Immediately disconnect the charge hose from
the gas side valve's service port.
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.
- 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.(4.2kg.m/5.5kg.m.)
- Be sure to check for gas leakage.
Cycle Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. difference
Current
: approx. 0°C
: less than 80% of
rated current
All amount of refrigerant leaked out.
Check refrigeration cycle.
Temp. difference
Current
: approx. 8°C
: less than 80% of
rated current
Refrigerant leakage
Clog of refrigeration cycle
Defective compressor
Temp. difference
Current
: less than 8°C
: over the rated
current
Temp. difference
: over 8°C
Temp. Difference
Operating Current
Excessive amount of refrigerant
Normal
Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Suction pressure
(Compared with
the normal value)
Temperature
(Compared with
the normal value)
Cause of Trouble
Description
High
Defective compressor
Current is low.
Normal
Excessive amount of
refrigerant
High pressure does not quickly
rise at the beginning of operation.
Insufficient amount of
refrigerant(Leakage)
Clogging
Current is low.
Higher
Lower
Higher
Current is low.
Notice:
1. The suction pressure is usually 4.5~6.0 kg/cm G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
2
Service Manual 33
Cycle Troubleshooting Guide
Electronic Parts
Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)
Turn off Main Power
(After 10 seconds)
Turn on Main Power
Does "beeping" sound is made from the Indoor Unit?
YES
NO
Primarily, the operating condition of Micom is OK.
Check the voltage of power (About AC 220V, 60Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check PWB Assembly
- Fuse
- Pattern damage
- Varistor(ZNR01J)
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector
Check the connection housing for contacting
• Connector related to CN-NI, RY-COMP NO.3
• Connector related to CN-MOTOR
• Connector contacting of Outdoor Fan/Compressor
• Display PCB Assembly Check
Main PCB Board Operation Check
Content
Items
• SMPS Transformer
(Indoor unit)
- Input Voltage
- Output Voltage(C03D)
Remedy
- About AC220V/240V±10% - Check the power voltage • Replace Trans
- About DC12V
• IC01D(7805) Output
(Indoor/Outdoor unit)
• DC +5V
• Replace IC01D
• IC01A(KIA7036, Reset IC)
OSC01B(8MHz)
• Voltage of IC No.1,
(DC +4.5V over) and Soldering condition.
• Replace faulty parts
34
Multi Air Conditioner
Cycle Troubleshooting Guide
The product is not 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 3 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 by force.)
Cause by the remote control
When the mark(
battery.
) is displayed in LCD screen, replace
Check the connecting circuit between the remote controller
MICOM (No. ) - R16(1.5k) - IR LED - TR - R17(1Ω).
or
MICOM (No. 61 ) - R1(1.5k) - IR LED - TR - R2(1Ω).
Caused by other parts except the remote control
Check the contact of CN-DISP1 connector.
Check Display PCB Assembly
- Voltage between CN DISP1
-
: DC +5V
Check point
• Check the connecting circuit between CN-DIS1
R11L(100Ω) - C01A(100nF) - MICOM PIN
• Check Receiver Assembly
-
Service Manual 35
Cycle Troubleshooting Guide
Compressor/Outdoor Fan are unable to drive.
Turn on Main Power
Operate "Cooling Mode( )" by setting the desired 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 attached as close as to be
effected by the temperature of Heat Exchanger(EVA).
When the sensor circuit for indoor temperature and connector are in bad
connection or are not engaged, Compressor/Outdoor Fan is stopped.
• Check the related circuit of RY-FAN.
• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C).
Check Relay(RY - COMP) for driving compressor.
• When the power(About AC220V/240V) is applied to the connecting wire
terminal support transferred to compressor, PWB Assembly is normal.
• Check the circuit related to the relay.
Check point
Between Micom(No.
59) and GND
Between IC01M(No. 15)
and GND
COMP ON
COMP OFF
DC5V
DC0V
Below DC 1V
(app)
About DC12V
Turn off Main Power
• Check the electrical wiring diagram of outdoor side.
• Check the abnormal condition for the component of
Compressor/Outdoor Fan Motor.
• Check the "open" or "short" of conmecting wires between indoor and
outdoor.
36 Multi Air Conditioner
Cycle Troubleshooting Guide
When indoor Fan does not operate.
Turn off Main power
Check the connection of CN-MOTOR
Check the Fan Motor
Check the Fuse(AC250V/T2A)
Check the related circuit of indoor Fan Motor.
• The pin NO 58 of Micom, and the part for driving TRIAC(the input and
output signal of IC01M, PIN NO 1, 16)
• Check the pattern
• Check the TRIAC
- TRIAC Open: Indoor Fan Motor never operate
- TRIAC short: Indoor Fan Motor always operates in case of ON or OFF.
Turn ON Main Power
Check the TRIAC high speed operation by remote control.
(The Indoor Fan Motor is connected)
The voltage of PIN NO 1(orange) and 3(yellow) of CN-MOTOR.
About AC 180V over
About AC 50V over
TRIAC is not damaged
TRIAC Check
Service Manual 37
Cycle Troubleshooting Guide
When Vertical Louver does not operate.
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
Normal
hands
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin (RED) of CN-U/D and
GND.
• Confirm that there is a soldering short at following terminals.
- Between 60 , 61 , 62 and 63 of MICOM
of IC01M
- Between , , and
of IC01M
- Between , , and
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the Vertical Louver
38 Multi Air Conditioner
Installation
Installation
Select the best Location
more than
20cm
1. If an awning is built over the unit to prevent
direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.
2. Ensure that the spaces indicated by arrows
around front, back and side of the unit.
3. Do not place animals and plants in the path
of the warm air.
4. Take the air conditioner weight into account
and select a place where noise and vibration
are minimum.
5. Select a place so that the warm air and noise
from the air conditioner do not disturb
neighbors.
more than
20cm
more than
70cm
Rooftop Installations:
If the outdoor unit is installed on a roof
structure, be sure to level the unit. Ensure the
roof structure and anchoring method are
adequate for the unit location. Consult local
codes regarding rooftop mounting.
Service Manual 39
Installation
40 Multi Air Conditioner
Installation
Piping Length and Elevation
• The maximun allowable level and piping length
Installation of the outdoor unit
on an upper position
7.5m
A
7.5m
B
A
Installation of the outdoor unit
on a lower position
7.5m
7.5m
B
Model
[Outdoor unit]
Standard length
T2UC182FAA
T2UC242FAA
Max. piping length of each indoor unit
A,B
A
B
C
7.5m
15m
15m
-
Max. total piping length
30m (A+B)
Refrigerant Charge
Indoor Unit Capacity
(Btu/h)
Pipe Size
Gas
Liquid
18k
3/8"(9.52mm)
1/4"(6.35mm)
24k
1/2"(12.7mm) 1/4"(6.35mm)
Rated
Length
Max
Length
Additional
Refrigerant
7.5
15
20g/m
7.5
15
30g/m
Extra refrigerant = (Extended length - Rated length) x Additional refrigerant
Service Manual
41
Flaring work and connection of piping
Flaring work and connection of piping
Flaring work
• Carry out flaring work using flaring tool as shown below.
Flaring work
Main cause for refrigerant leakage is due to defect in the
flaring work. Carry out correct flaring work using the following procedure.
Cut the pipes and the cable.
• Use the piping kit accessory or pipes purchased locally.
• Measure the distance between the indoor and the outdoor unit.
• Cut the pipes a little longer than the measured distance.
• Cut the cable 1.5m longer than the pipe length.
Outside diameter
mm
inch
A
mm
Ø6.35
1/4
0~0.5
Ø9.52
3/8
0~0.5
Ø12.7
1/2
0~0.5
Ø15.88
5/8
0~1.0
Ø19.05
3/4
1.0~1.3
Check
• Compare the flared work with figure below.
Copper
pipe
90q
Slanted Uneven Rough
• If flare is noted to be defective, cut off the flared section and re-flare it.
Smooth all round
Inside is shiny without scratches
Burr removal
= Improper flaring =
• Completely remove all burrs from the cut cross section of
pipe/tube.
• Put the end of the copper tube/pipe in a downward direction as you remove burrs in order to avoid dropping burrs
into the tubing.
Even length
all round
Inclined Surface Cracked Uneven
damaged
thickness
Connection of piping -- Indoor
Pipe
Reamer
• Preparing the indoor unit's piping and drain hose for installation through the wall.
Point down
• Remove the plastic tubing retainer(see illustration below)
and pull the tubing and drain hose away from chassis.
Putting nut on
• Remove flare nuts attached to indoor and outdoor unit,
then put them on pipe/tube having completed burr removal.
(not possible to put them on after flaring work)
• Replace the plastic tubing holder in the original
position.(Optional)
Flare nut
Drain hose
Copper tube
Flaring work
• Firmly hold copper pipe in a die in the dimension shown in
the table above.
"A"
Bar
Handle
Bar
Yoke
Cone
Copper pipe
Clamp handle
42 Multi Air Conditioner
Red arrow mark
When install, make sure that the
remaining parts must be removed
clearly so as not to damage the piping and drain hose, especially power
cord and connecting cable.
Flaring work and connection of piping
Connecting the pipings to the indoor unit and
drain hose to drain pipe.
For right rear piping
Route the indoor tubing and the drain hose in the direction of
rear right.
• Align the center of the pipes and sufficiently tighten
the flare nut by hand.
Drain hose
Indoor unit tubing
Flare nut
Pipes
• Tighten the flare nut with a wrench.
Insert the connecting cable into the indoor unit from the outdoor unit through the piping hole.
Open-end wrench (fixed)
Flare nut
• Do not connect the cable to the indoor unit.
• Make a small loop with the cable for easy connection later.
Wrench
Connection pipe
Indoor unit tubing
Tape the tubing, drain hose, and the connecting cable. Be
sure that the drain hose is located at the lowest side of the
bundle. Locating at the upper side can cause drain pan to
overflow inside the unit.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Ø15.88
5/8
Ø19.05
3/4
Torque
kg.m
1.8
4.2
5.5
6.6
6.6
• When extending the drain hose at the indoor unit, install the
drain pipe.
Tape
Connecting
pipe
Drain pipe
Drain hose
Connecting cable
NOTE: If the drain hose is routed inside the room, insulate
the hose with an insulation material* so that dripping from
"sweating"(condensation) will not damage furniture or floors.
*Foamed polyethylene or equivalent is recommended.
Indoor unit installation
Indoor unit drain hose
Adhesive
•Overlap the connection pipe insulation material and the
indoor unit pipe insulation material. Bind them together with
vinyl tape so that there is no gap.
• Hook the indoor unit onto the upper portion of the installation plate.(Engage the two hooks of the rear top of the
indoor unit with the upper edge of the installation plate.)
Ensure that the hooks are properly seated on the installation plate by moving it left and right.
Connecting
cable
Vinyl tape(narrow)
Wrap the insulation material around the connecting portion.
Plastic bands Insulation material
• Wrap the area which accommodates the rear piping housing section with vinyl tape.
Indoor
unit pipe
Connection
pipe
Drain hose
Press the lower left and right sides of the unit against the
installation plate until the hooks engage into their slots(clicking sound).
Vinyl tape
Wrap with vinyl tape
(wide)
Connecting cable
Pipe
Vinyl tape(narrow)
Service Manual 43
Flaring work and connection of piping
• Bundle the piping and drain hose together by wrapping
them with vinyl tape for enough to cover where they fit into
the rear piping housing section.
Wrap with vinyl tape
Connecting the pipings to the indoor unit and
the drain hose to drain pipe.
• Align the center of the pipes and sufficiently tighten the
flare nut by hand.
Pipe
Vinyl tape(wide)
Indoor unit tubing
Drain hose
For left rear piping
Flare nut
Pipes
• Tighten the flare nut with a wrench.
Route the indoor tubing and the drain hose to
the required piping hole position.
Open-end wrench (fixed)
Flare nut
Wrench
Connection pipe
Indoor unit tubing
Insert the piping, drain hose, and the connecting cable into the piping hole.
Connecting cable
Drain pipe
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Ø15.88
5/8
Ø19.05
3/4
Torque
kg.m
1.8
4.2
5.5
6.6
6.6
• When extending the drain hose at the indoor unit, install the
drain pipe.
Insert the connecting cable into the indoor unit.
• Don't connect the cable to the indoor unit.
Drain hose
• Make a small loop with the cable for easy connection later.
Tape the drain hose and the connecting cable.
Indoor unit drain hose
• Connecting cable
Adhesive
Vinyl tape (narrow)
Wrap the insulation material around the connecting portion.
• Overlap the connection pipe heat insulation and the indoor
unit pipe heat insulation material. Bind them together with
vinyl tape so that there is no gap.
Indoor unit installation
Plastic bands Insulation material
• Hang the indoor unit from the hooks at the top of the installation plate.
• Insert the spacer etc. between the indoor unit and the
installation plate and separate the bottom of the indoor unit
from the wall.
Indoor unit
Spacer
Installation plate
8cm
44 Multi Air Conditioner
Flaring work and connection of piping
• Wrap the area which accommodates the rear piping housing section with vinyl tape.
Indoor
unit piping
Connection
pipe
Vinyl tape
(wide)
Wrap with vinyl tape
Indoor unit installation
• Remove the spacer.
• Ensure that the hooks are properly seated on the installation plate by moving it left and right.
Pipe
Vinyl tape(narrow)
Connecting
cable
Connecting cable
Drain hose
• Bundle the piping and drain hose together by wrapping
them with cloth tape over the range within which they fit
into the rear piping housing section.
Press the lower left and right sides of the unit against the
installation plate until the hooks engage into their
slots(clicking sound).
Pipe
Drain hose
Vinyl tape(narrow)
Installation Information (For left piping)
• Good case
For left piping. Follow the instruction below.
Wrap with
vinyl tape(wide)
• Press on the upper side of clamp. ( )
Reroute the pipings and the drain hose across
the back of the chassis.
• Unfold the tubing to downward slowly. ( )
Piping for
passage through
piping hole
Set the pipings and the drain hose to the back
of the chassis with the tubing holder.
• Hook the edge of tubing holder to tap on chassis and push
the bottom of tubing holder to be engaged at the bottom of
chassis.
• Bend the tubing to the left side of chassis.
Tubing holder
Service Manual 45
Flaring work and connection of piping
Connection of the pipes-Outdoor
• Bad case
• Following bending type from right to left could cause
problem of pipe damage.
Align the center of the pipings and sufficiently
tighten the flare nut by hand.
Finally, tighten the flare nut with torque wrench
until the wrench clicks.
• When tightening the flare nut with torque wrench, ensure
the direction for tightening follows the arrow on the wrench.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Ø15.88
5/8
Ø19.05
3/4
Torque
kg . m
1.8
4.2
5.5
6.6
6.6
Outdoor unit
Gas side piping
(Bigger diameter)
Liquid side
piping
(Smaller
diameter)
Torque wrench
46 Mutli Air Conditioner
Connecting the cable between indoor unit and outdoor unit
Connecting the cable between indoor unit and outdoor unit
Connect the cable to the Indoor unit.
Connection of the cable
1. Remove the cover control from the unit by loosening the screw.
Connect the wires to the terminals on the control board individually as the following.
2.Secure the cable onto the control board with the holder (clamper).
3.
screw.
4.Use a recongnized circuit breaker between the power
source and the unit. A disconnection device to ade-
Outdoor unit
Terminal block
Over 5mm
Holder for
power supply
cord
Cover control
Connecting cable
Power cord
Service Manual 47
Connecting the cable between indoor unit and outdoor unit
The power cord connected to the outdoor unit should be complied with the following specifications
(ETL recognized and CSA certified).
T2UC182FAA
T2UC242FAA
(mm2)
GN
Grade
NORMAL CROSS T2UC182FAA T2UC242FAA
-SECTIONAL AREA
GN
/YL
/YL
20
20
mm
mm
Cable Type(B)
2.5
2.5
H07RN-F
H07RN-F
The power connecting cable connected to the indoor and outdoor unit should be complied with
the following specifications.
(mm2)
GN
/YL
20
mm
48 Multi Air Conditioner
NORMAL CROSS
-SECTIONAL AREA
Grade
Cable Type(B)
H07RN-F
0.75
Exploded View and Replacement Parts List
Exploded View and Replacement Parts List
Indoor Unit
135316
135515
131410
342800
359011
135311
354210
352111
352116
346810
135516
354210
35211B
146811
W6640
W0CZZ
263230
267110
249951
Service Manual 49
Exploded View and Replacement Parts List
Parts List (Indoor)
LOCATION No.
DESCRIPTION
PART No.
SVC
CODE
TMNC092DYAA TMNC122DYAA
(M122CD)
(M092CD)
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.
(GCSC WEBSITE http://biz.LGservice.com)
50 Multi Air Conditioner
435301
437210
435512
552117
148390
552204
559010
430410
349600
552114
447910
546810
554030
554170
249951
552203
552203
552204
435511
437212
Exploded View and Replacement Parts List
• T2UC182FAA
Service Manual 51
Exploded View and Replacement Parts List
Parts List
LOCATION No.
DESCRIPTION
PART No.
T2UC182FAA
(M182CX)
SVC
CODE
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.
(GCSC WEBSITE http://biz.LGservice.com)
52 Multi Air Conditioner
435301
349490
552117
W5210D
552114
559010
552114
349600
552111
552111
430410
447910
546810
554160
W6640
554031
W6920
648600
554160
237200
669010
552203
649950
435511
552203
552203
Exploded View and Replacement Parts List
• T2UC242FAA
Service Manual
53
Exploded View and Replacement Parts List
Parts List
LOCATION No.
DESCRIPTION
PART No.
T2UC242FAA
(M242CX)
SVC
CODE
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.
(GCSC WEBSITE http://biz.LGservice.com)
54
Multi Air Conditioner
P/No.: MFL47139201
December, 2007
Printed in China