LG LMNH122LRA0 User manual

LG
Multi Type Air Conditioner
SERVICE MANUAL
LG
CAUTION
website http://www.lgservice.com
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
MODEL
• Indoor Unit:
• Outdoor Unit: L8UC100BFA0
L8UH100BFA0
Duct Type
LMNH122BTG0
LMNH182BTG0
LMNH242BYG0
LMNH182BHA0
LMNH242BHA0
LMNH302BGA0
LMNH362BGA0
LMNH482BEG0
LMNC122BTG0
LMNC182BTG0
LMNC242BYG0
LMNC182BHA0
LMNC242BHA0
LMNC302BGA0
LMNC362BGA0
LMNC482BEG0
Art Cool Deluxe Type
LMNH122DU*0
LMNH182D3*0
LMNH242D3*0
LMNC122DU*0
LMNC182D3*0
LMNC242D3*0
LMNH122TEA0
LMNH122TEC0
LMNH182TEA0
LMNH182TEC0
LMNH242TFA0
LMNH242TFC0
LMNH302TFA0
LMNH302TFC0
LMNH362TDA0
LMNH362TDC0
LMNH482TDA0
LMNH482TDC0
LMNC122TEA0
LMNC122TEC0
LMNC182TEA0
LMNC182TEC0
LMNC242TFA0
LMNC242TFC0
LMNC302TFA0
LMNC302TFC0
LMNC362TDA0
LMNC362TDC0
LMNC482TDA0
LMNC482TDC0
4 Way CST Type
Room Type
LMNH122LRA0
LMNH122LRL0
LMNH182LTA0
LMNH182LTL0
LMNH242LTA0
LMNH242LTL0
LMNC122LRA0
LMNC122LRL0
LMNC182LTA0
LMNC182LTL0
LMNC242LTA0
LMNC242LTL0

2Multi type Air Conditioner
Multi type Air Conditioner Service Manual
TABLE OF CONTENTS
Model Number Nomenclature....................................................................................................................3
Safety Precautions......................................................................................................................................6
Dimensions................................................................................................................................................12
Indoor Unit..............................................................................................................................................12
Outdoor Unit............................................................................................................................................18
Product Specifications.............................................................................................................................19
Installation.................................................................................................................................................24
Select the best location of indoor unit.....................................................................................................24
How to fix ...............................................................................................................................................25
Piping and Drainage of Indoor Unit.........................................................................................................29
Connection of indoor unit piping..............................................................................................................30
Remote Controller Installation.................................................................................................................40
Connecting Pipings and the cable to Outdoor unit..................................................................................42
Checking the Drainage and Pipe forming................................................................................................44
Maximum Length of Pipe and Extra Charge of Refrigerant Charge........................................................47
Piping Connection Size...........................................................................................................................50
Test Running...........................................................................................................................................51
Operation...................................................................................................................................................56
Function of control...................................................................................................................................56
Function of Indoor Unit............................................................................................................................61
Function of Outdoor Unit.........................................................................................................................64
Remote Control Operation......................................................................................................................65
Control Devices and Function .................................................................................................................73
Simple Central Control............................................................................................................................73
Term of Each part and Function..............................................................................................................73
Electrical wiring.......................................................................................................................................74
Deluxe Central Control............................................................................................................................80
Disassembly of the parts (Indoor unit) ...................................................................................................86
Indoor unit...............................................................................................................................................86
Schematic Diagram...................................................................................................................................89
Electronic Control Device........................................................................................................................89
Wiring Diagram .......................................................................................................................................94
Components Locations ...........................................................................................................................96
Troubleshooting Guide...........................................................................................................................101
Refrigeration Cycle Diagram.................................................................................................................101
Self-diagnosis Function.........................................................................................................................104
Cycle Troubleshooting Guide................................................................................................................105
Electronic Parts Troubleshooting Guide................................................................................................106
General Information ..............................................................................................................................111
(3-way) Valve ...........................................................................................................................................127
Exploded View & Replacement Parts List ............................................................................................131
Indoor Unit ............................................................................................................................................131
Outdoor Unit .........................................................................................................................................155

Service Manual 3
Model Number Nomenclature
Model Number Nomenclature
Indoor Unit
Outdoor Unit
LMN H 2
12 RLA0
Serial Number
L8U H B100 F A 0
Electrical Ratings
MPS Variable Multi System Indoor Unit
Model Type
H : Heat Pump
C : Cooling Only
Ex) 12,000 Btu/h '12', 48,000 Btu/h '48'
Nominal Heating or Cooling Capacity in Btu/h
Electrical Rating
2 : 1Ø, 220V, 60Hz
Chassis Name
Indoor Unit Type
L : Wall Mounted
T : Ceiling Cassette
B : Ceiling Concealed Duct
D : Art Cool Deluxe
Function
A : Basic, L : Nano Plasma + Auto Clean(Wall Mounted)
C: Plasma(Ceiling Cassette), G: Low Static Motor
Art Cool Deluxe Type Front Panel Color
B: Blue, D: Wood, M: Metal, R: Mirror, W: White
R22 MPS Variable Multi System Outdoor Unit.
And No. of Connectable Indoor Units
Ex) L2U : Connectable max. 2 Indoor Units
L8U : Connectable max. 8 Indoor Units
Model Type
H : Heat Pump C : Cooling Only
Ex) 100,000 Btu/h '100', 72,000 Btu/h '72'
Nominal Cooling Capacity in Btu/h
B : 3Ø, 220V, 560Hz
Multi Type
Function
A : Basic
F : Free Joint Multi Type
Serial Number

Model Number Nomenclature
Panel (Cassette)
4Multi type Air Conditioner
TF PT-HFA 3821A10072A 8435002992886 HEATING
PT-HFC 3721A10072E 8435002992893 HEATING + PLASMA
PT-CFA 3721A10072B 8435002992862 COOLING
PT-CFC 3721A10072G 8435002992879 COOLING + PLASMA
PT-HEA 3721A10105A 8435002992978 HEATING
CST PANEL TE(family look) PT-HEC 3721A10105B 8435002992985 HEATING + PLASMA
PT-CEA 3721A10105C 8435002992954 COOLING
PT-CEC 3721A10105D 8435002992961 COOLING + PLASMA
PT-HDA3721A10106A 8435002994057 HEATING
TD(family look) PT-HDC 3721A10106B 8435002994064 HEATING + PLASMA
PT-CDA 3721A10106C 8435002994071 COOLING
PT-CDC 3721A10106D 8435002994088 COOLING + PLASMA
Category CHASSIS PANEL NAME PANEL P/NO. SERIAL NO. Remark
123456
PT-HEA
Basic A
B
Plasma Filter C
D
Elevation Grille E
Elevation Grille + Plasma Filter F
TE/TB/TD Before 2003 : Basic 0
TE/TD Before 2003 : Plasma Filter 1
6. Function
5. Chassis Name
Function
Number Contents
1, 2 Panel for Cassette
3-
4 Cooling/Heatpump
5 Chassis Name
6 Function
Chassis Abbrevation
TD D
TE E
TF F

Service Manual 5
Model Number Nomenclature
Indoor Units
Outdoor Units
3.5
(12000) 5.3 (18000) 7.0 (24000) 8.8 (30000) 10.6 (36000) 14.0 (48000)
LMNH/C
122LRL0
LMNH/C
122DU*0 LMNH/C
182D3*0 LMNH/C 242D3*0
----
-LMNH/C
182LTL0 LMNH/C 242LTL0 --
LMNH/C
122TEA0 LMNH/C 182TEA0 -- -
--
LMNH/C
242TFA0 LMNH/C 302TFA0 -
----
LMNH/C
362TDA0
-LMNH/C
182BHA0 LMNH/C 242BHA0 --
-
-
-
-
-
-
-LMNH/C
302BGA0 LMNH/C 362BGA0
LMNH/C
122BTG0 LMNH/C
182BTG0 LMNH/C
242BYG0
-- -
-
-
-
-
LMNH/C
482TDA0
-
-
LMNH/C
482BEG0
-
Model Name
Capacity, kW(Btu/h)
SR
DU
D3
ST
TE
TF
TD
BH
BG
BE
Low
Static
BT
BT1
BY
Chasiss
Wall
Mounted General
Mirror
Category Type
Ceiling
Cassette
Art Cool
4Way
Ceiling
Concealed
Duct
High
Static
Model Name Cooling Only
Heating Pump
Rated Capacity Cooling kW(Btu/h)
Heating kW(Btu/h)
Number of Indoor Units Multi Piping Type
to be Connected Distributor Type
Indoor Units Btu/h
Connectable Capacity Btu/h
Power Supply
L8UC100BFA0
L8UH100BFA0
29.2(100000)
29.2(100000)
Max. 2 Units
Max. 8 Units
12,000~48,000
12,000~100,000
3Ø, 220V, 60Hz
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the
air conditioner.
This symbol indicates special notes.
NOTICE
Symbols Used in this Manual

6Multi type Air Conditioner
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.
■Meanings of symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
WARNING
■Installation
Be sure not to do.
Be sure to follow the instruction.
Do not use a defective or under-
rated circuit breaker. Use this
appliance on a dedicated circuit.
•There is risk of fire or electric
shock.
For electrical work, contact the
dealer, seller, a qualified electrician,
or an Authorized Service Center .
•Do not disassemble or repair the
product. There is risk of fire or
electric shock.
Always ground the product.
•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.
Always install a dedicated cir-
cuit and breaker.
•Improper wiring or installation may
cause fire or electric shock
Use the correctly rated break-
er or fuse.
•There is risk of fire or electric
shock.

Service Manual 7
Safety Precautions
Do not modify or extend the
power cable.
•There is risk of fire or electric
shock.
Do not install, remove, or re-
install the unit by yourself
(customer).
•There is risk of fire, electric shock,
explosion, or injury.
Be cautious when unpacking
and installing the product.
•Sharp edges could cause injury.
Be especially careful of the case
edges and the fins on the con-
denser and evaporator.
For installation, always con-
tact 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.
Be sure the installation area
does not deteriorate with age.
•If the base collapses, the air condi-
tioner could fall with it, causing
property damage, product failure,
and personal 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.
Take care to ensure that
power cable could not be
pulled out or damaged during
operation.
•There is risk of fire or electric
shock.
Do not place anything on the
power cable.
•There is risk of fire or electric
shock.

8Multi type Air Conditioner
Safety Precautions
Do not allow water to run into
electric parts.
•It may cause There is risk of fire,
failure of the product, or electric
shock.
Do not store or use flammable
gas or combustibles near the
product.
•There is risk of fire or failure of
product.
Do not use the product in a
tightly closed space for a long
time.
•Oxygen deficiency could occur.
When flammable gas leaks,
turn off the gas and open a
window for ventilation before
turn the product on.
•Do not use the telephone or turn
switches on or off. There is risk of
explosion or fire
If strange sounds, or small or
smoke comes from product.
Turn the breaker off or discon-
nect the power supply cable.
•There is risk of electric shock or
fire.
Stop operation and close the
window in storm or hurricane.
If possible, remove the prod-
uct from the window before
the hurricane arrives.
•There is risk of property damage,
failure of product, or electric shock.
Do not plug or unplug the
power supply plug during
operation.
•There is risk of fire or electric
shock.
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 and electric
shock.
Gasolin

Service Manual 9
Safety Precautions
Do not open the inlet grill of the product
during operation. (Do not touch the elec-
trostatic filter, if the unit is so equipped.)
•There is risk of physical injury,
electric shock, or product failure.
When the product is soaked
(flooded or submerged), contact
an Authorized Service Center.
•There is risk of fire or electric
shock.
Be cautious that water could
not enter the product.
•There is risk of fire, electric shock,
or product damage.
Ventilate the product from time to time when
operating it together with a stove, etc.
•There is risk of fire or electric shock.
Turn the main power off when cleaning or
maintaining the product.
•There is risk of electric shock.
When the product is not be used for a long time, dis-
connect the power supply plug or turn off the breaker.
•There is risk of product damage or failure, or unintend-
ed operation.
Take care to ensure that nobody could step on
or fall onto the outdoor unit.
•This could result in personal injury and product dam-
age.
Always check for gas (refrigerant) leak-
age 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 leak-
age.
CAUTION
■Installation
90°

10 Multi type Air Conditioner
Do not block the inlet or outlet
of air flow.
•It may cause product failure.
Use a soft cloth to clean. Do
not use harsh detergents, sol-
vents, etc.
•There is risk of fire, electric shock,
or damage to the plastic parts of
the product.
Do not touch the metal parts of
the product when removing the
air filter. They are very sharp!
•There is risk of personal injury.
Safety Precautions
Do not install the product
where the noise or hot air
from the outdoor unit could
damage the neighborhoods.
•It may cause a problem for your
neighbors.
Don't use people to lift and
transport the product
(use fork lift)
•Avoid personal injury.
Do not install the product
where it will be exposed to
sea wind (salt spray) directly.
•It may cause corrosion on the
product. Corrosion, particularly on
the condenser and evaporator fins,
could cause product malfunction or
inefficient operation.
Do not expose the skin directly to cool air for
long periods of time.
(Don't sit in the draft.)
•This could harm to your health.
Do not use the product for special purposes,
such as preserving foods, works of art, etc. It
is a consumer air conditioner, not a precision
refrigeration system.
•There is risk of damage or loss of property.
■Operational
Wax
Thinner