LG ATNH126ELFC User manual

LG
Synchro
Air Conditioner
SERVICE MANUAL
LG
CAUTION
website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

2Synchro Air Conditioner
Synchro Air Conditioner Service Manual
TABLE OF CONTENTS
Model Number Nomenclature......................................................................3
Safety Precautions .......................................................................................4
Model Names...............................................................................................11
External Appearance..................................................................................12
Dimensions .................................................................................................13
Product Specifications...............................................................................21
Combination table ......................................................................................25
Installation...................................................................................................26
Operation ....................................................................................................61
Control Devices and Function...................................................................76
Schematic Diagram ....................................................................................89
Piping Diagrams .......................................................................................100
Troubleshooting Guide.............................................................................105
(3-way) Valve ............................................................................................126
Function ....................................................................................................130
Exploded View & Replacement Parts List..............................................147

Service Manual 3
Model Number Nomenclature
Model Number Nomenclature
Indoor Unit
Outdoor Unit
A T N H 18 6 E L F B
Serial Number
Function
A : Basic
E : E/Grille
F : Plasma + Elevation grille
Panel type
Cassette L : Basic panel, W : Wooden panel
Duct : L
Chassis type
Cassette : E/F/D, Convertible : E/B, Duct : H/G/R
Electrical Rating
6 : 1Ø 220-240V ,50Hz
Nominal Cooling Capacity in Btu/h
Ex)18,000Btu/h '18', 24,000Btu/h '24'
Model Type
H : Heat Pump
Unit Type
N : Indoor Unit U : Outdoor Unit
Indoor Unit Type
T : Ceiling Cassette
V : Ceiling&Floor(Convertible)
B : Ceiling Concealed Duct
Refrigerent Type
A : R410A, L : R22
A U U H 100 8 0
Air Discharge Type
0 : Top discharge, A : Side discharge
Electrical Rating(Volt/Hertz/Phase)
1 : 115 / 60 / 1 2 : 220 / 60 / 1
3 : 208-230 / 60 / 1 5 : 200-220 / 50 / 1
6 : 220-240 / 50 / 1 8 : 380-415 / 50 / 3
Nominal Cooling Capacity in Btu/h
Ex)72,000Btu/h '72', 100,000Btu/h '100'
Model Type
W : DC Inverter Heat Pump(MPS Inverter)
H : Conventional Heat Pump(MPS Variable)
Unit Type
N : Indoor Unit, U : Outdoor Unit
Indoor Unit Type
2/3/4 : Multi Room, U : Universal, B : Duct, T : Cassette
Refrigerent Type
A : R410A, L : R22

4Synchro 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.
Be sure not to do.
Be sure to follow the instruction.
WARNING
■Installation
Have all electric work done by a licensed
electrician according to "Electric Facility
Engineering Standard" and "Interior Wire
Regulations" and the instructions given in
this manual and always use a special circuit.
• If the power source capacity is inadequate or
electric work is performed improperly, electric
shock or fire may result.
Ask the dealer or an authorized technician to
install the air conditioner.
• Improper installation by the user may result in
water leakage, electric shock, or fire.
Always ground the product.
• There is risk of fire or electric shock.
Always intstall a dedicated circuit and breaker.
• Improper wiring or installation may cause fire or
electric shock.

Service Manual 5
Safety Precautions
For re-installation of the installed product,
always contact a dealer or an Authorized
Service Center.
• There is risk of fire, electric shock, explosion, or
injury.
Do not install, remove, or re-install the unit
by yourself (customer).
• There is risk of fire, electric shock, explosion, or
injury.
Do not store or use flammable gas or
combustibles near the air conditioner.
• There is risk of fire or failure of product.
Use the correctly rated breaker or fuse.
• There is risk of fire or electric shock.
Prepare for strong wind or earthquake and
install the unit at the specified place.
• Improper installation may cause the unit to top-
ple and result in injury.
Do not install the product on a defective
installation stand.
• It may cause injury, accident, or damage to the
product.
When installing and moving the air condition-
er to another site, do not charge it with a
different refrigerant from the refrigerant
specified on the unit.
• If a different refrigerant or air is mixed with the
original refrigerant, the refrigerant cycle may
malfunction and the unit may be damaged.
Do not reconstruct to change the settings of
the protection devices.
• If the pressure switch, thermal switch, or other
protection device is shorted and operated
forcibly, or parts other than
those specified by LGE are
used, fire or explosion may
result.
Gasolin

6Synchro Air Conditioner
Safety Precautions
Ventilate before operating air conditioner
when gas leaked out.
• It may cause explosion, fire, and burn.
Securely install the cover of control box and
the panel.
• If the cover and panel are not installed securely,
dust or water may enter the outdoor unit and fire
or electric shock may result.
If the air conditioner is installed in a small room, measures must be taken to prevent the
refrigerant concentration from exceeding the safety limit when the refrigerant leaks.
• Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceed-
ed. Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxy-
gen in the room could result.
■Operation
Do not damage or use an unspecified power
cord.
• There is risk of fire, electric shock, explosion, or
injury.
Use a dedicated outlet for this appliance.
• There is risk of fire or electrical shock.
Be cautious that water could not enter the
product.
• There is risk of fire, electric shock, or product
damage.
Do not touch the power switch with wet
hands.
• There is risk of fire, electric shock, explosion, or
injury.

Service Manual 7
Safety Precautions
When the product is soaked (flooded or
submerged), contact an Authorized Service
Center.
• There is risk of fire or electric shock.
Be cautious not to touch the sharp edges
when installing.
• It may cause injury.
Take care to ensure that nobody could step
on or fall onto the outdoor unit.
• This could result in personal injury and product
damage.
Do not open the inlet grill of the product dur-
ing operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)
• There is risk of physical injury, electric shock, or
product failure.
CAUTION
■Installation
Always check for gas (refrigerant) leakage
after installation or repair of product.
• Low refrigerant levels may cause failure of
product.
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.
Keep level even when installing the product.
• To avoid vibration or water leakage.
Do not install the unit where combustible gas
may leak.
• If the gas leaks and accumulates around the
unit, an explosion may result.
90˚
Gasolin

8Synchro Air Conditioner
Safety Precautions
Use power cables of sufficient current
carrying capacity and rating.
•Cables that are too small may leak, generate
heat, and cause a fire.
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.
Keep the unit away from children. The heat
exchanger is very sharp.
•It can cause the injury, such as cutting the finger.
Also the damaged fin may result in degradation
of capacity.
When installting the unit in a hospital, com-
munication station, or similar place, provide
sufficient protection against noise.
• The inverter equipment, private power generator,
high-frequency medical equipment, or radio com-
munication equipment may cause the air condition-
er to operate erroneously, or fail to operate. On the
other hand, the air conditioner may affect such
equipment by creating noise that disturbs medical
treatment or image broadcasting.
Do not install the product where it is 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.

Service Manual 9
Safety Precautions
■Operation
Do not use the air conditioner in special
environments.
•Oil, steam, sulfuric smoke, etc. can significantly
reduce the performance of the air conditioner or
damage its parts.
Do not block the inlet or outlet.
•It may cause failure of appliance or accident.
Make the connections securely so that the
outside force of the cablemay not be applied
to the terminals.
•Inadequate connection and fastening may gen-
erate heat and cause a fire.
Be sure the installation area does not deteri-
orate with age.
•If the base collapses, the air conditioner could
fall with it, causing property damage, product
failure, or personal injury.
Install and insulate the drain hose to ensure that water is drained away properly based on the
installation manual.
•A bad connection may cause water leakage.
Be very careful about product transportation.
•Only one person should not carry the product if it weighs more
than 20 kg.
•Some products use PP bands for packaging. Do not use any PP
bands for a means of transportation. It is dangerous.
•Do not touch the heat exchanger fins. Doing so may cut your fin-
gers.
•When transporting the Outdoor Unit, suspending it at the specified
positions on the unit base. Also support the Outdoor Unit at four
points so that it cannot slip sideways.

10 Synchro Air Conditioner
Safety Precautions
Safely dispose of the packing materials.
• Packing materials, such as nails and other metal or
wooden parts, may cause stabs or other injuries.
• Tear apart and throw away plastic packaging bags
so that children may not play with them. If children
play with a plastic bag which was
not torn apart, they face the
risk of suffocation.
Turn on the power at least 12 hours before
starting operation.(In case of outdoor
temperature 5°C below)
•Starting operation immediately after turning on
the main power switch can result in severe
damage to internal parts. Keep the power switch
turned on during the operational season.
Do not touch any of the refrigerant piping
during and after operation.
•It can cause a burn or frostbite.
Do not operate the air conditioner with the
panels or guards removed.
•Rotating, hot, or high-voltage parts can cause
injuries.
Do not directly turn off the main power
switch after stopping operation.
•Wait at least 5 minutes before turning off the
main power switch.
Otherwise it may result in
water leakage or other
problems.
Auto-addressing should be done in condition of
connecting the power of all indoor and outdoour
units. Auto-addressing should also be done in
case of changing the Indoor Unit board(PCB).
Use a firm stool or ladder when cleaning or
maintaining the air conditioner.
•Be careful and avoid personal injury.
Do not insert hands or other objects through
the air inlet or outlet while the air conditioner
is plugged in.
•There are sharp and moving parts that could
cause personal injury.

Service Manual 11
Model Names
Model Names
Indoor Unit
Outdoor Unit
Branch Kit
TE
Ceiling Cassette 4-Way TF
TD
Ceiling & Floor(Convertible) VE
VB
BH
Ceiling Concealed Duct BG
BR
Model Name
Nominal Capacity[Btu/h(Kw)]
Chassis
Name
Type
12,000
(3.5) 18,000 (5.3) 24,000 (7.0) 30,000 (8.8) 36,000 (10.6) 48,000 (14.1) 60,000 (17.6)
ATNH126ELFC ATNH186ELFC - - - -
- - ATNH246FLFC ATNH306FLFC - -
- - - - ATNH366DLFC ATNH486DLFC ATNH606DLFC
AVNH126ELAC - - - - -
- AVNH186BLAC AVNH246BLAC AVNH306BLAC - -
- ABNH186HLAC ABNH246HLAC - - -
- - - ABNH306GLAC ABNH366GLAC -
- - - - - ABNH486RLAC ABNH606RLAC
Indoor Unit
UH AUUH488C - - -
MPS Variable UY - - AUUH 728C -
UW - - - AUUH1008C
Model Name
Nominal Capacity[Btu/h(Kw)]
Type Chassis
Name
48,000
(14.0) 60,000 (17.6) 72,000 (21.1) 100,000 (29.0)
Outdoor Unit
Name of accessory Model No. Indoor classification Capacity Ratio(%) Remark
PMUB11A "Synchro" Duo 50:50(1:1)
PMUB23A 40:60(2:3) Unbalance type
Branch Kit PMUB111A 33:33:33(1:1:1)
PMUB112A "Synchro" Trio 25:25:50(1:1:2) Unbalance type
PMUB122A 20:40:40(1:2:2) Unbalance type
PMUB1111A "Synchro" Quartet 25:25:25:25(1:1:1:1)

12 Synchro Air Conditioner
External Appearance
External Appearance
Indoor Unit
Outdoor Unit
Ceiling Cassette-4Way Ceiling & Floor(Convertible)
Ceiling Concealed Duct
ATNH126ELFC / ATNH186ELFC
ATNH246FLFC / ATNH306FLFC
ATNH366DLFC / ATNH486DLFC
ATNH606DLFC
AVNH126ELAC / AVNH186BLAC
AVNH246BLAC / AVNH306BLAC
ABNH186HLAC / ABNH246BHLAC
ABNH306GLAC / ABNH366BGLAC
ABNH486RLAC / ABNH606RLAC
AUUH728C
AUUH488C
AUUH1008C

Service Manual 13
Dimensions
Dimensions
Indoor Unit
CLOSE OPEN OPEN CLOSE
269
670
30
570
269
190.5
160
52
90 90
120.4 30 521
670 570
450
40
110 110
670
670
4
1
3
2
5
6
Unit:mm
570 Unit size
570 Unit size
450 (Hanging bolt)
7575
600 (Ceiling opening)
600 (Ceiling opening)
521(Hanging bolt) 39.5
39.5
1. Cassette Type - TE(12K/18K)
(unit : mm)
Number Name Descripition
1 Liquid pipe connection ø6.35 flare
2 Gas pipe connection 12k: ø9.52, 18k: ø12.7 flare
3 Drain pipe connection
4 Power supply connection
5 Air discharge grill
6 Air suction grill

14 Synchro Air Conditioner
Dimensions
2. Cassette Type - TF (24K/30K)
292
850
850
850
850
744 658
572
744
292
212
150
54
90 90
192 117
70
110 110
41
3
2
5
6
Unit:mm
744 Unit size
744 Unit size
658 (Hanging bolt)
6666
790 (Ceiling opening)
790 (Ceiling opening)
572(Hanging bolt) 109
109
30
(unit : mm)
Number Name Descripition
1 Liquid pipe connection ø6.35 flare
2 Gas pipe connection
24K: ø12.7, 30K: ø15.88 flare
3 Drain pipe connection
4 Power supply connection
5 Air discharge grill
6 Air suction grill

Service Manual 15
Dimensions
288
950
950
950
950
290
210.5
180
52
140
40
110
30
90 90
110
55
840
785
840
678
Fresh Air Inlet
Unit:mm
840 Unit size
840 Unit size
672 (Hanging bolt) 101.5101.5
875 (Ceiling opening)
875 (Ceiling opening)
785 (Hanging bolt) 45
45
4
5
6
1
3
2
(unit : mm)
Number Name Descripition
1 Liquid pipe connection 36K: ø6.35, 48K/60K: ø9.52 flare
2 Gas pipe connection 36K: ø15.88, 48K/60K: ø19.05 flare
3 Drain pipe connection
4 Power supply connection
5 Air discharge grill
6 Air suction grill
3. Cassette Type - TD(36K/48K/60K)

16 Synchro Air Conditioner
Dimensions
Ø12.7Ø6.3518k, 24k
Ø15.88Ø6.3530k
GasLiquidModel
1. Pipe Specification(mm)
Note:
1200
205
615
R
More than
20cm
More than eye-level
More than
20cm
R
(Ceiling installation)
R
More than
20cm
More than
20cm
(Floor/Wall installation)
(Rear Side)
(Unit: mm)
1076
Suspension bolt
(W3/8 or M10) Center-line for the
piping hole
265
1236 265
1076
more than
260
265
1236
392
265
468
63
Ø10 Stud Bolt hole
38
175
(Installation Plate)
250
128
36
36 1076
4. Ceiling & Floor(Convertible) - VB(18K/24K), VE(12K)

Service Manual 17
Dimensions
Top view
(unit: mm) Front view
600600
Front
Inspection hole
※Suitable dimension "H" is necessary
to get a slope to drain as figure.
(600X600)
Control box
1000
H
l
i
h
j
k
A
H
CD EF
B
(G) ab c d
KJ
fe
Ø12.7
Ø15.88
Ø6.35
Ø9.52
18, 24k
30, 36 Ø19.05
48, 60k
k
GasLiquidModel
1. Pipe Specification(mm)
Note:
C D E F (G) H J K a b c d e f h i j k l
355 45.5 450 30 87 750 163 260 61.5 243 212.3 243 110 130 52 66 81 30 158.5
355 45.5 450 30 87 830 186 298 229.5 243 232 243 116 160 53 59 81 19 158.5
477 56 590 30 120 1006 294 380 215 279 241 279 185 168 51 98 83 17 172
Capacity A B
932 882
1232 1182
1282 1230
ABNH186HLAC
ABNH246HLAC
ABNH306GLAC
ABNH366GLAC
ABNH486RLAC
ABNH606RLAC
(Unit: mm)
5. Ceiling Concealed Duct - BH(18K/24K), BG(30K/36K), BR(48K/60K)

18 Synchro Air Conditioner
Dimensions
AUUH488C
L6L7 L8 L9
L4
H
L11
L10
L5
W
D
L1
L2
L3
Gas side
3-way valve
Control cover
Liquid side
3-way valve
4-hole for anchor bolts
Wmm 900
Hmm 1
,165
Dmm 370
L1 mm 460
L2 mm 45
L3 mm 410
L4 mm 1,135
L5 mm 30
L6 mm 550
L7 mm 175
L8 mm 175
L9 mm 112
L10 mm 120
L11
1
2
mm 83
mm Ø9.52
mm Ø19.05
AUUH488C
Model
Dimensions

Service Manual 19
Dimensions
AUUH728C
Air
inlet
Air
inlet
Air outlet
Service Panel
(Unit : mm)
Knockout hole
(For the control wiring,
the power supply,
refrigerant connecting
pipe)
Knockout hole
(For the control wiring, the power supply,
refrigerant connecting pipe)
153
15
690
40
144428100
220
1512
670
730
153
806
500(bolt hole)
700(bolt hole)

20 Synchro Air Conditioner
Dimensions
45
33 160
60
15
190 900(bolt hole)
1280
190
700(bolt hole)
730
690
670
1555
63 1444 48
100
Air
inlet
Air
inlet
Air outlet
Service Panel
Knockout hole
Knockout hole
(For the control wiring, the power supply,
refrigerant connecting pipe)
(For the control wiring,
the power supply,
refrigerant connecting
pipe)
AUUH1008C