LG ATNH126ELFB User manual

LG
Universal System
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.

2Universal System Air Conditioner
TABLE OF CONTENTS
Safety Precautions...................................................................................................3
I. Indoor Units
Introduction..............................................................................................................8
Ceiling Cassette 4-way..........................................................................................10
Ceiling & Floor.......................................................................................................37
Ceiling concealed Duct..........................................................................................51
II. Outdoor Units
Introduction............................................................................................................73
MPS Variable Single A(AUUH-B, R410A) .............................................................75
III. Troubleshooting Guide
Self-diagnosis Function.........................................................................................99
Electronic Parts Troubleshooting Guide ..............................................................100
IV. Electronic Control Device
Ceiling Cassette Type..........................................................................................107
Ceiling Duct Type.................................................................................................108
Ceiling & Floor.....................................................................................................110
V. Schematic Diagram
Ceiling Cassette Type..........................................................................................113
Ceiling Duct Type.................................................................................................114
Ceiling & Floor.....................................................................................................115
VI. Explode View and Replacement Parts List
Indoor Units.........................................................................................................117
Outdoor Units ......................................................................................................135
Panel Assembly, Front.........................................................................................149

I. Indoor Units
Introduction.......................................................................................................8
Ceiling Cassette 4-way...................................................................................10
Ceiling & Floor................................................................................................37
Ceiling Concealed Duct..................................................................................51
Service Manual 7

• Models List
Type Refrigerant Chassis
name 18,000 (5.3) 24,000 (7.0) 30,000 (8.8) 36,000 (10.6)
TE ATNH
186ELFB ---
TF - ATNH
246FLFB ATNH 306FLFB -
TD - - - ATNH
366DLFB
Ceiling & Floor R410A VB AVNH
186BLAB AVNH 246BLAB AVNH 306BLAB -
BH ABNH
186HLAB ABNH 246HLAB --
BG -
12,000
(3.5)
ATNH
126ELFB
-
-
-
-
--
BR -----
ABNH
306GLAB
48,000
(14.1)
-
--
ATNH
486DLFB ATNH 606DLFB
-
60,000
(17.6)
-
-
--
--
VE AVNH
126ELAB --
-- --
ABNH
486RLAB ABNH 606RLAB
ABNH
366GLAB
1Ø, 220-240V,
50Hz
Model name
Nominal capacity [Btu/h(kW)] Power
Supply
R410A
Ceiling
Cassette
4-Way
Ceiling
Concealed
Duct
Indoor unit
R410A
8Universal System Air Conditioner
Introduction
Introduction

• Model Number Nomenclature
Indoorunit
Decoration panel(For Ceiling Cassette Models)
A T N H 1 8 6 E L FB
Serial Number
Functions
A :Basic B : Low Ambient
C : Plasma Filter E : Elevation Grille
F : Elevation Grille + Plasma Filter
H : Plasma Filter + Low Ambient
L : Nano Plasma M : Nano Plasma + Elevation Grille
Look
L : Basic
E : E Chassis F : F Chassis D : D Chassis
Chassis Name
Electrical Ratings
6:1Ø,220V~240V,50Hz 8:3Ø,380V~415V,50Hz
Nominal CoolingCapacity in Btu/h
Ex) 18 -> 18,000 Btu/h, 48 -> 48,000 Btu/h
Model Type
C : Cooling Only H : HeatPump
Indicates that this is a indoor unit for R410A
ATN : Ceiling cassette type indoor unit
ABN : Ceiling concealed duct type indoor unit
AVN : Convertible type indoor unit
P T - H EC
Functions
A : Basic C : Plasma Air Purifier
E : Elevation Grille F : Elevation Grille + Plasma Air Purifier
Indoor Unit Chassis
E : E Chassis F : F Chassis D : D Chassis
Model Type
C : Cooling Only H : Heat Pump
Decoration Panel of Ceiling Cassette Type Indoor Unit
Service Manual 9
Introduction

10 Universal System Air Conditioner
Ceiling Cassette 4-way
Contents
1. Features & Benefits ..............................................................................11
2. List of Functions....................................................................................15
3. Specifications........................................................................................16
4. Dimensional Drawings ..........................................................................18
5. Wiring Diagrams ...................................................................................22
6. Piping Diagrams....................................................................................24
7. Operating Instructions...........................................................................27
8. Installation.............................................................................................29
9. Accessories ..........................................................................................36
Ceiling Cassette 4-way
(R410A·Indoor Units)
ATNH-EL/FL/DL
Ceiling Cassette 4-way

(18k Btu/h model)
■Convenience
•Auto elevation grille(Accessory)
•Tele control(Accessory)
•LCD wired remote control
•Group control
•Central control(Accessory)
•Weekly progam
■Cleanness
•Plasma air purifying system
•Hygienic and easy to clean filter
■Easy Installation
•Compact design & easy installation
•High ceiling corresponding operation
•High head drain pump(700mm)
■Comfort & Reliability
•Low noise with 3-dimensional turbo fan
•2-Thermistor control(Main body & Remote control)
•Zero stanby power consumption
•Jet cool
•Swirl swing
•Space control
Compact Design and Easy Installation
Only about 269mm height in the ceiling is sufficient for
installation space.
A smaller size than a Textile(600X600) is very conve-
nient for installation.
Low Noise with 3-dimensional
turbo fan
The most advanced low-noise design.
The adoption of turbo-fan and round type heat
exchanger provides the quietest operation.
Hygienic and Easy-to-Clean Filter
Washable and anti bacteria filter is adopted.
It is easy to open grille and replace clean filter.
Service Manual 11
Ceiling Cassette 4-way
1. Features & Benefits

12 Universal System Air Conditioner
Ceiling Cassette 4-way
Ceiling Board
Drain Pan
Maximum 700mm
Drain Pump
Flexible drain hose
Pipe fixture
Slope 1/50~1/100
Hard Tube(ex.PVC)
+
+
+
+
Polluted Air Purified fresh Air
+4.8KV discharge
Ionizer Photo-Catalyst Coated Mesh
Dust particles
Odour
Dust electrode discharge
Odour molecule
Generating plasma
Plasma Air Purifying System
The PLASMA Air Purifying Function not only removes micro-
scopic contaminants and dust, but also removes house
mites, pollen, and pet fur helps to prevent allergic diseases
like asthma.
High Head Drain Pump(700mm)
Built-in Drain Pump drains out water automatically.
A standard drain-head height of up to 700 mm is possible, creating the ideal solution for perfect water drainage.
High-Ceiling Corresponding Operation
According to the height of the installation, it provides vari-
ability of indoor fan motor rpm. If the height of installation is
low then you can adjust low rpm of indoor fan motor. On
the other hand if the height of the installation is high you
can adjust high rpm of indoor fan motor. Selection of
speed can be done by slide switch at the back of the LCD
wired remote.
Tele Control (Accessory)
- It provides you ease of control. Air conditioner
can be switched on/off by the telephone. It
saves time & energy.
ON
ONON OFF
ON OFF OFFOFF
In Advance by Telephone
Before Coming Home... In case of Going out
Without Turning off the
Air Conditioner...
Over than 3.3mHigh Ceiling 2.7~3.3mStandard
Ceiling HeightSwitch selection Less than 2.7mLow Ceiling

Child Lock Function
-It prevents the children or others from tampering
with the control buttons. Unit can be controlled by
the wireless remote controller. This can be easily set
by pressing timer key & Min key simultaneously.
After child lock is set, pressing any key will display
CL on the LCD for 3 seconds and all the keys will be
ineffective.
Auto Elevation Grille(Accessory)
-Auto Elevation Grille is automatically down to height
of max. 3.1 m. So it enables to install the Indoor unit
at high ceiling space. And Auto Elevation Grille
makes you cleaning the filter easily.
CHILD LOCK
-Display
71
Vane 2
Swirl Swing(New)4- Open(Conventional)
Swirl Swing(New)4- Open(Conventional)
2.4% 4.8%100% Improved
Comparison of Air Flow Types
Comparison of Floor
Temp. Distribution(20°C)
Vane 1 Close OpenOpen
Open
Open
Open
Close CloseOpen
Vane 3 Close Open Close CloseOpen
OpenOpen Close CloseOpen
Vane 2
OpenOpen
Time
Close CloseOpen
Vane 4
Vane 1
Vane 3
Vane 2
Time
Vane 4
Vane 3
Vane 4
Vane 1
Swirl Swing
- It is the function for comfort cooling/heating operation.
- The diagonal two louvers are opened the
more larger than the other louvers.
After one minute, it is opposite.
Space Control
Vanes angle can be controlled by pair, considering its
installation environment.
- For example direct drafts can be annoying, leading
to discomfort and reduced productivity vane control
helps to eliminate this problem.
- Easily controlled by wired remote control.
- Air Flow can be controlled easily regarding any
space environment.
Service Manual 13
Ceiling Cassette 4-way

14 Universal System Air Conditioner
Ceiling Cassette 4-way
Weekly Program
- On/Off schedule of operation for a period of ONE
week.
No need to turn the unit On/OFF manually during
working days. On/Off time is scheduled in micom of
the wired remote control.
Auto Restart Operation
- Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same
mode prior to the power failure. Memorized condition are on / off condition, operating mode (cooling/heating),
set temperature and fan speed.The unit will memorize the above conditions and start with same memorized
condition.
Two Thermistor Control
- There may be a significant difference between the temperature taken at the installed product and indoor tem-
perature. Two thermistor control provides option to control temperature by referring any of the two tempera-
tures. With the help of the slide switch at the back of the LCD wired remote controller, selection of the desired
thermistor for controlling the unit can be done. One thermistor is in the Indoor unit & the other one is in the
LCD wired remote.
Group Control
- It enables to control as much as 16 units with the
help of one wired remote controller. All the units will
follow same setting of temperature & other sub func-
tions.
Central Control(Accessory)
- It enables to control 16 x 8 = 128 units with the help
of 8 controllers. All units can be put on and off from
one Central Room.For Setting Temperature, Fan
Speed and other sub functions, access the respec-
tive LCD wired remote controller of each unit.
❈Sub PI485(with wire assembly) should be pur-
chased as optional.
Operation Time Table (Example)
Mon Tue Wed Thu Fri Sat Sun
OFF
Setting
Temp.
On
Off
25°C25°C25°C25°C25°C
09:00
12:00
08:00
17:00
09:00
12:00
08:00
12:00
09:00
12:00
10mm 10mm
1216........
........
Main
PCB
Controller
# 1 Controller # 2 Controller # 8
M
1
Sub
1
M
2
Sub
2
M
16
Sub
16
M
17
Sub
17
M
18
Sub
18
M
128
Sub
128