LG LB-H482ESG0 User manual

LG
Ceiling Duct-Type Air Conditioner
INSTALLATION MANUAL
LG
MODELS: LB-H482ESG0
LB-C482ESG0
LB-H602ESG0
LB-C602ESG0
LB-H48BESG0
LB-C48BESG0
LB-H60BESG0
LB-C60BESG0
IMPORTANT
• Please read this installation manual completely before
installing the product.
• When the power cord is damaged, replacement work shall
be performed by authorized personnel only.
• Installation work must be performed in accordance with
the national wiring standards by authorized personnel
only.
• Please retain this installation manual for future reference
after reading it thoroughly.

2Ceiling Duct Type Air Conditioner
Ceiling Duct Type Air Conditioner Installation Manual
TABLE OF CONTENTS
Safety Precautions..............3
Introduction .........................7
Installation of Indoor,
Outdoor Unit ........................8
Connecting Pipes to the
Indoor Unit .........................18
Connecting Pipes to the
Outdoor Unit ......................20
Checking the Drainage .....20
Connecting Cables
between Indoor Unit and
Outdoor Unit ......................21
Air Purging of the
Connecting Pipes and the
Indoor Unit .........................24
Group Control....................25
Two Thermistor system ....25
Installation
Requirements Required Parts Required Tools
• Four Type “A” screws
• Connecting cable
• Level
• Screw driver
• Electric drill
• Hole core drill (ø70mm)
• Pipes: Gas side .....1/2", 5/8", 3/4"
Liquid side .............1/4", 3/8", 1/2"
• Insulated drain hose
• Insulation materials
• Flaring Tools set
• Additional Drain hose
(Inner Dia...............25mm)
• Screw driver
• Hexagonal Wrench (4mm/5mm)
• Gas-leak Detector

Safety Precautions
Installation Manual 3
ENGLISH
To prevent injury to the user or other people and property damage, the following instructions must be
followed.
■Be sure to read before installing the air conditioner.
■Be sure to observe the cautions specified here as they include important items related to safety.
■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.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage.
■Installation
Be sure not to do.
Be sure to follow the instruction.
Safety Precautions
Do not damage or use an unspecified power
cable.
• It will cause electric shock or fire.
Do not disassemble or repair the product.
• Contact your dealer and service center.
Always earth the product.
• It will cause fire or electric shock.
Do not handle the flamable gas or explosive
materials near the product.
• Otherwise, it may cause fire or failure of
product.
Do not install the product where flamable
gas could leak.
• Otherwise, it may cause esplosion or fire.
Do not install the product on the defected
installation stand.
• Otherwise, It may cause injury or accident.
Be cautious when unpack and install the
product.
• Sharp edges could cause injury.
For installation, always contact the dealer or
service center.
• Otherwise, it may cause fire, electric shock,
explosion or injury.
Do not install the product on an defected
installation stand.
• Otherwise, It may cause injury or accident.
For electric work, contact the dealer or
service center.
• Otherwise, It will cause fire or electric shock.

4Ceiling Duct Type Air Conditioner
Safety Precautions
Do not modify power cable length.
• It will cause fire or electric shock.
Always intstall a circuit breaker and
exclusive switching board.
• No installation may cause fire and electric
shock.
Use a rated breaker and fuse.
• Otherwise, it may cause fire and electric shock.
Do not use a defected circuit breaker and
exclusive switching board.
• Otherwise, it may cause fire and electric shock.
■Operation
Do not touch(operate) product with wet
hands.
• Otherwise, it may cause fire or electric shock.
If strange sound, smell or smoke comes
from product. Turn the breaker off or
disconnect the power supply cable.
• Otherwise, it may cause electric shock or fire.
Do not place the heater, etc. near the power
cable.
• Otherwise, it may cause fire and electric shock.
Do not put water into electric part.
• Otherwise, it may cause fire or failure of
product, and electric shock.
Ventilate the room frequently using with a
stove, etc.
• Otherwise, an ozygen shortage may occur.
When the product is not be used for a long
time, disconnect the power supply plug or
turn off the breaker.
• Otherwise, it may cause failure of product or
fire.
Do not place heavy object on the power
cable.
• Otherwise, it may cause fire or electric shock.
When the product is soaked, contact the
service center.
• Otherwise, it may cause fire or eletric shock.
Install the panel and the cover of control box
securely.
• Otherwise, it may cause fire and electric shock."
Do not turn the breaker on/off or
connect/disconnect the power supply plug
during operation.
• Otherwise, it may cause fire or electric shock.
Do not open the inlet grill of the product
during operation.
• Otherwise, it may cause electric shock or
failure.
Do no touch the metal parts of the product
when removing the air filter.
• Otherwise, it may cause personal injury.
Do not let children step on
the product.
• Otherwise, children may be
seriously injured.
Do not step or put anyting
on the product.
• Otherwise, it may cause
personal injury and failure of
product.
Be cautious that water could
not enter the product.
• Otherwise, it may cause fire or
electric shock.

Safety Precautions
Installation Manual 5
ENGLISH
■Operation
■Installation
Always inspect gas leakage after
installation and repair of product.
• Otherwise, it may cause failure of product.
Install the drain hose to ensure that drain
can be securely done.
• Otherwise, it may cause water leakage.
Keep the level even when install the
product.
• Otherwise, it may cause vibration or water
leakage.
Do not install the product where the noise
or hot wind from the outdoor unit could
give any damage to the neighborhoods.
• Otherwise, it may cause dispute with the
neighborhoods.
Do not carry the product by oneself.
• Otherwise it may harm to your health.
Do not install the product exposed to sea
wind(salt) directly.
• Otherwise, it may cause the rust on product.
Do not expose your skin directly to cool air
for a long time.
• Otherwise, it may harm to your health.
When flammable gas leaks, open the
window for ventilation before turn the
product on.
• Otherwise, it may cause explosion or fire.
Turn the main power off when cleaning the
product.
• Otherwise, it may cause fire and electric shock.
Do not put a pet or houseplant where it is
exposed to direct air flow.
• This could injure the pet or plant.
Do not use the product for special purpose
to preserve animals, vegetables, precision
device, or works of art, etc.
• Otherwise, it may cause loss of property.
Stop operation and close the window in
strom or hurricane.
• Otherwise, it may cause failure of product or
electric shock.
Do not place obstacles aroud the inlet or
outlet of air flow.
• Othewise, it may cause failure of product.
Always insert the filter securely.
Clean the filter every two weeks.
• Otherwise, it may cause failure of the product.
Use a soft cloth to clean, Do not use wax,
tinner or a strong detergent, etc.
• Otherwise, it may change the appearance of
the product.
Do not drink drained water from the
product.
• Otherwise, it may harm to your health.

6Ceiling Duct Type Air Conditioner
Safety Precautions
Do not insert your hand or bars, etc. into
the air inlet/outlet.
• Otherwise, it may cause personal injury.
Do not use the product at the closed space
for a long time.
• Otherwise, it may cause suffocation due to
poor oxygen.
Do not operate the product for a long time
at high humid place, and leave a door or a
window open.
• Otherwise, water may drop and wet or damage
furniture, etc.
Do not step on an unstable bench when
maintaining the product, etc.
• Otherwise, it may cause personal injury.
Replace the 2 batteries with new ones of
same type.
• Otherwise, it may cause fire or explosion.
Do not charge or disassemble the batteries
and throw into a fire.
• Otherwise, it may cause fire or an explosion.
If the liquid from the batteries gets onto
your skin or clothes, wash it well with clean
water.
• Otherwise it may harm to your health.

Installation Parts Provided
Installation Manual 7
ENGLISH
Air filters
(Optional)
Air outlet vents
Air intake vents
Remote Controller
(Side) (Rear)
Air intake vents
Air outlet vents
Piping
Drain hose
Connecting
wire
Control
cover
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
Introduction
Symbols Used in this Manual
Features

8Ceiling Duct Type Air Conditioner
Installation of Indoor, Outdoor Unit
Installation of Indoor, Outdoor Unit
Indoor unit
Install the air conditioner in the location that
satisfies the following conditions.
•The place shall easily bear a load exceeding
four times the indoor unit’s weight.
•The place shall be able to inspect the unit as
the figure.
•The place where the unit shall be leveled.
•The place shall allow easy water
drainage.(Suitable dimension “H”is necessary
to get a slope to drain as figure.)
•The place shall easily connect with the
outdoor unit.
•The place where the unit is not affected by an
electrical noise.
•The place where air circulation in the room will
be good .
•There should not be any heat source or steam
near the unit
Outdoor unit
•If an awning is built over the unit to prevent
direct sunlight or rain exposure, be careful that
heat radiation from the condenser is not
restricted.
•There should not be any animals or plants
which could be affected by hot air discharged.
•Ensure the spaces indicated by arrows from
the wall, ceiling, fence or other obstacles.
Selection of the best location
H
600600
Top view
(unit: mm)
Front view
Front
Inspection hole
(600X600)
Control box
1000
More than
30cm
More than
30cm
More than
70cm
Sunroof
Fence or
obstacles

Installation of Indoor, Outdoor Unit
Installation Manual 9
ENGLISH
Piping length and the elevation
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
A
Oil trap
Outdoor unit
Indoor unit
B
If piping length is more than 5m
60
100
85
Capacity
Gas
3/4"
3/4"
3/4"
Liquid
3/8"
1/2"
1/2"
Elevation B(m)
Length A(m)
*Additional
refrigerant
(g/m)
Pipe Size
(Diameter: Ø)
Standard
7.5
7.5
7.5
Standard
5
5
5
Max.
50
50
50
Max.
30
30
30
48k Btu/h
60k Btu/h(1ø)
60k Btu/h(3ø)
CAUTION:
•If 48k Model is installed at a distance of 50m, 2550g of refrigerant
should be added (50-7.5) x 60g = 2550g
•Capacity is based on standard length and maximun allowance length
is on the basis of reliability.
•Improper refrigerant charge may result in abnormal cycle.
•Oil trap should be installed every 10 meters.

10 Ceiling Duct Type Air Conditioner
Installation of Indoor, Outdoor Unit
Indoor unit installation
Installation of Unit
Install the unit above the ceiling correctly.
•Apply a joint-canvas between the unit and duct
to absorb unnecessary vibration.
•Apply a filter Accessory at air return hole.
•Install the unit leaning to a drainage hole side
as a figure for easy water drainage.
•A place where the unit will be leveled and that
can support the weight of the unit.
•A place where the unit can withstand its
vibration.
•A place where service can be easily
performed.
CASE 1
POSITION OF SUSPENSION BOLT
Drainage hole
A
B
C
1-3 mm D
(G)
H
I
EF
M10 Nut
M10 SP. washer
M10 washer
X 4
X 4 (Local
supply)
X 4
M10 Nut
M10 SP. washer
M10 washer
X 4
X 4 (Local
supply)
X 4
CASE 2
POSITION OF CONSOLE BOLT
(Unit:mm)
48K BTU/h 1292 1230 570.5 54 680 30 120 1006 294
60K BTU/h
Dimension
Capacity
ABCDE F(G)HI

Installation of Indoor, Outdoor Unit
Installation Manual 11
ENGLISH
•Select and mark the position for fixing bolts.
•Drill the hole for set anchor on the face of
ceiling.
•Insert the set anchor and washer onto the
suspension bolts for locking the suspension
bolts on the ceiling.
•Mount the suspension bolts to the set anchor
firmly.
•Secure the installation plates onto the
suspension bolts (adjust level roughly) using
nuts, washers and spring washers.
CAUTION:
Tighten the nut and bolt to
prevent unit falling.
1 Set anchor
Old building New building
2 Plate washer
3 Spring washer
4 Nut
5 Suspension
bolts

12 Ceiling Duct Type Air Conditioner
Installation of Indoor, Outdoor Unit
Ceiling
CAUTION
1~3mm
Drainage hole
Drainage hole
U-Trap
B
C
A ≥70mm
B ≥2C
C ≥2 x SP
SP = External Pressure
(mmAq)
Ex) External Pressure
= 10mmAq
A ≥70mm
B ≥40mm
C ≥20mm
A
Make sure to be closed.
Unit
Drainage pipe
(Local supply)
Thermal insulator
(Local supply)
Drainage hole
CAUTION FOR GRADIENT OF
UNIT AND DRAIN PIPING
Lay the drain hose with a downward
inclination so water will drain out.
Front of view
•Always lay the drain with downward
inclination (1/50 to 1/100).
Prevent any upward flow or reverse flow in
any part.
•5mm or thicker formed thermal insulator
shall always be provided for the drain pipe.
•Install the P-Trap (or U-Trap) to prevent
a water leakage caused by the blocking
of intake air filter.
Applied U-Trap Dimension
1. Install declination of the indoor unit is very important for the drain of the duct type air
conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 5mm.
•The unit must be horizontal or declined to the drain hose connected when finished
installation.
CORRECT
CORRECT
INCORRECT
INCORRECT
•Upward routing not
allowed

Installation of Indoor, Outdoor Unit
Installation Manual 13
ENGLISH
•Drill the piping hole with 70mm dia, hole core
drill.
•Piping hole should be slightly slant to the
outdoor side.
5~7mm
Indoor Outdoor
WALL
INSULATION, OTHERS
Insulate the joint and tubes completely.
All thermal insulation must comply with local requirement.
INDOOR UNIT
REFRIGERANT PIPE
•Insulate and tape the gas piping.
■After all workings are finished, check the working and operation.
•Air distribution Is the air circulation good?
•Drain Is the drainage smoothly and no sweating?
•Gas leakage Is the piping connection correctly?
•Wiring Is the wiring connection correctly?
•Lock-bolt Is the lock-bolt of compressor loosened?
THERMAL INSULATION
TEST AND CHECK
Make sure that there is no clearance here.
Overlap with thermal
insulator for piping.
Thermal insulator for refrigerant pipe
(Local supply) Thermal insulator for
piping(Local supply)
Hose clip for thermal insulator(Local supply)
Union for liquid pipe
Refrigerant pipe and thermal
insulator(Local supply)
Union for gas pipe
Thermal insulator for refrigerant pipe
(Local supply)
Hose clip for thermal insulator
(Local supply)
Power cable
Thermal insulator
Gas pipe
Liquid pipe
Tape

14 Ceiling Duct Type Air Conditioner
Installation of Indoor, Outdoor Unit
INSTALLATION OF REMOTE CONTROL BOX Install the remote control box and
cord correctly.
•Although the room temperature sensor is in the indoor unit, the remote control box
should be installed in such places away from direct sunlight and high humidity.
INSTALLATION OF THE REMOTE CONTROL BOX
•Select places that is not splashed by
water.
•Select control position after receiving
customer approval.
•The room temperature sensor of the
thermostat for temperature control is built
in the indoor unit.
•This remote controller equipped with liquid
crystal display. If this position is higher or
lower, display is difficult to see.
(The standard height is 1.2~1.5m high)
ROUTING OF THE REMOTE CONTROL CORD
•Keep the remote control cord away from
the refrigerant piping and the drain piping.
•To protect the remote control cord from
electrical noise, place the cord at least
5cm away from other power cables. (Audio
equipment, Television set, etc)
•If the remote control cord is secured to a
wall, provide a trap at the top of the cord
to prevent water droplets from running.
POINT OF REMOTE CONTROLLER INSTALLATION
DISASSEMBLING OF THE REMOTE CONTROLLER
ELECTRICAL WIRING TO THE INDOOR UNIT
Make sure that wire and terminal
numbers are matched on unit side
and remote controller side.
(Main board)
CN REMO
The maximum length of the cord is 100m.
If the length of the cord exceeds 50m, use a wire size greater than 0.5mm2.
Remote controller
CN REMO
Remote
control
box body
Lever carefully
the box open
using a screw
driver, etc.
Front case
The lower part
Face of wall
Upper notch
Upper flange
Under plate
Remote
control cord
Remote
control unit
Tapping screw
(Local supply)
Lower notch
Face of wall
Upper notch
Lower notch
Switch box
(Local supply)
Under plate
Remote
control unit
Remote
control cord
Screw
(Local supply)
Cord
clamp
Push hand
(Part B)
(Part A)
FIXING OF REMOTE
CONTROL CORD
1. Fix the cord clamps on the wall
by ø3 tapping screws(Local supply).
2. Fix the remote control cord.
PROCEDURE OF INSTALLATION
1. Fix the under plate on the switch box by
screws(Local supply). In this case, fit the under
plate on the wall, and be careful of deformation.
2. Receive the remote control cord in the switch
box.
3. Hook the remote control unit on the under plate.
WHEN THE REMOTE CONTROL BOX IS
INSTALLED WITH THE CORD BURIED.
PROCEDURE OF INSTALLATION
1. Fix the under plate on the wall by self tapping
screws (accessory).
2. Make a slit (Part A) at the top side of the remote
control box by nipper.
3.Rout the cord as shown in the following figure. In
this case, push the cord into the around of
case(Part B).
4. Hook the remote control unit on the under plate.
WHEN THE REMOTE CONTROL BOX IS
INSTALLED WITH THE CORD EXPOSED.

Installation of Indoor, Outdoor Unit
Installation Manual 15
ENGLISH
WIERED REMOTE CONTROLLER INSTALLATION
•Since the room temperature sensor is in the remote controller, the remote controller box
should be installed in a place away from direct sunlight, high humidity and direct supply of cold
air to maintain proper space temperature.
Install the remote controller about 5ft(1.5m) above the floor in an area with good air circulation
at an average temperature.
Do not install the remote controller where it can be affected by:
- Drafts, or dead spots behind doors and in corners.
- Hot or cold air from ducts.
- Radiant heat from sun or appliances.
- Concealed pipes and chimneys.
- Uncontrolled areas such as an outside wall behind the remote controller.
- This remote controller is equipped with a seven segment LED. display. For proper display of
the remote controller LED's, the remote controller should be installed properly as shown in
Fig.1.
(The standard height is 1.2~1.5 m from floor level.)
Operationunit
ZONE
1234
Humidify JET
AUTO
AUTOSWING OPERATION FANSPEED
Programset
SUBFUNCTION SETTEMP
RoomTemp
HI
MED
LO
Heater
Defrost
Filter
Preheat
Outdoor
Time
Timer
On
Setno. Time
Off
01 03 05 07 09 11 13 15 17 19 21 23
Operationunit
ZONE
1234
Humidify
JET
AUTO
AUTOSWINGOPERA
TION
FANSPEED
Programset
SUBFUNCTION
SETTEMP
RoomT
emp
HI
MED
LO
Heater
Defrost
Filter
Preheat
Outdoor
Time
Timer
On
Setno.Time
Off
010305070
9111315171
92
123
5feet
(1.5meters)
no
no
no
yes
Operationunit
ZONE
1234
Humidify JET
AUTO
AUTOSWING OPERATION FANSPEED
Programset
SUBFUNCTION SETTEMP
RoomTemp
HI
MED
LO
Heater
Defrost
Filter
Preheat
Outdoor
Time
Timer
On
Setno. Time
Off
01 03 05 07 09 11 13 15 17 19 21 23
Fig.1 Typical locations for remote controller

16 Ceiling Duct Type Air Conditioner
Installation of Indoor, Outdoor Unit
Flared connection (Union)
Flared connection
(Service valve, Ball valve)
Use a seemliness tube
Factory charged
Indoor
Outdoor
■Select the following location
•A place where the air conditioner can get good ventilation.
•A place where it shall not annoy the neighbors.
•A place where the unit shall be leveled and that can support the weight of unit and
withstand its vibrations.
■Keep a maintenance space
REFRIGERANT PIPING
INSTALLATION OF OUT DOOR UNIT
Perform the work according to the Service Manual
or Installation Guide.
Select a location that satisfies the following
conditions. Install the unit firmly in place.
•Use two spanners when connecting the
refrigerant pipe to the unit.
•Make a bend with a radius as large as
possible.
•Perform air purge with R-22 or vacuum
drying.
•When piping work is finished, check all
joints.
■Add refrigerant if piping is over 7.5m.
Above 70Cm
Above 30Cm
Outdoor unit
Above 30Cm Above 50Cm
Face of wall
Capacity Addition volume
48k Btu/h 60 g/m
60k Btu/h(1ø) 100 g/m
60k Btu/h(3ø) 85 g/m

Installation of Indoor, Outdoor Unit
Installation Manual 17
ENGLISH
Outdoor
Indoor
Control terminal board
Control box
Control box cover
(On which the Electric
Wiring Connection is put)
AA
view
Remote
control cord
Connection
cord between
the indoor unit
and the
outdoor unit
Cord clamper
1
1
Main
power source Switch box
Circuit Breaker
Main terminal board
Control terminal board
Cord
clamper
Cover control
ELECTRICAL WIRING
Indoor unit
•Remove the control box cover for
electrical connection between the
indoor and outdoor unit.
(Remove crews .)
•Use the cord clamper to fix the cord.
Perform the electrical wiring work according to the
electrical wiring connection.
•All wiring must comply with local
requirements.
•Select a power source that is capable of
supplying the current required by the air
conditioner.
•Use a recognized circuit breaker between
the power source and the unit. A
disconnection device to adequately
disconnect all supply lines must be fitted.
•Capacity of circuit breaker
WIRING CONNECTION
Outdoor unit
•Remove the control cover for wiring
connection.
•Use the cord clamper to fix the cord.
•Earthing work
Connect the cable of diameter 1.6mm2
or more to the earthing terminal
provided in the control box and do
earthing.
Please check !!
Capacity 1 Phase 3 Phase
48k Btu/h 50A 50A
60k Btu/h 50A 50A

18 Ceiling Duct Type Air Conditioner
Connecting Pipes to the Indoor Unit
Connecting Pipes to the Indoor Unit
Preparation of Piping
Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the
following procedure.
Cut the pipes and the cable.
•Use the accessory piping kit or the pipes
purchased locally.
•Measure the distance between the indoor and
the outdoor unit.
•Cut the pipes a little longer than measured
distance.
•Cut the cable 1.5m longer than the pipe
length.
Burrs removal
•Completely remove all burrs from the cut cross
section of pipe/tube.
•Put the end of the copper tube/pipe to
downward direction as you remove burrs in
order to avoid to let burrs drop in the tubing.
Putting nut on
•Remove flare nuts attached to indoor and
outdoor units, than put them on pipe/tube
having completed burr removal.
(Not possible to put them on after flaring work)
Flaring work
•Carry out flaring work using flaring tool as
shown below.
Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
Check
•Compare the flared work with figure.
•If flare is noted to be defective, cut off the
flared section and do flaring work again.
Outside Diameter "A"
1/4" 0~0.5
3/8" 0.5~0.8
1/2" 0.5~0.8
5/8" 0.8~1.0
3/4" 1.0~1.3
Copper
tube
90°Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =

Connecting Pipes to the Indoor Unit
Installation Manual 19
ENGLISH
Pipe bending
Annealed copper pipe with small diameter (ø6.35 or ø9.52) can be easily bent manually. In this
case, secure large R(radius) for the bend section and gradually bend pipe. If annealed copper pipe
is large in diameter (ø15.88 or ø19.05), bend pipe with bender. Use bender appropriate for the pipe
diameter.
Brazing
In refrigerant piping, bending (in particular, acute bending) must be minimized to reduce piping
resistance. Bending is, however, necessary in some places by virtue of the installation position of
devices auxiliary to the packaged air conditioner, or of the building structure, piping distance or
finishing appearance. If a more acute bend is required than that attainable by pipe bender, perform
brazing using ready-made elbow. Aside from this function, brazing also serves to connect straight
pipes, generally using ready-made sockets. While brazing, protect piping against heat with wet cloth
to avoid damaging valve packing or burning thermal insulator with burner heat. While brazing, blow
inert gas (nitrogen gas or carbonic gas) to prevent formation of oxidation film in copper piping;
otherwise, the refrigerant circuit will clog. The blowing of nitrogen gas (or carbonic gas) through 3-
way valves is described in the following:
Refrigerant piping(Flare piping)
When connecting piping, be sure to keep piping dry(keep piping away from water), clean (keep
piping away from dust) and airtight (avoid refrigerant leakage).
When connecting piping on rainy days or making a through-hole in wall, take due care to prevent
water or plaster from entering piping.
Water enters Plaster enters
CAUTION:
•This procedure is designed to prevent formation of oxidation film by
filling piping with inert gas. Note that excessive gas pressure will
generate pinholes at brazed points.
(Nitrogen gas: Supply pressure 0.05~0.1kg/cm2G)
•When supplying inert gas, be sure to open one end of piping.

20 Ceiling Duct Type Air Conditioner
Connecting Pipes to the Outdoor Unit
Connecting Pipes to the Outdoor Unit
Checking the Drainage
Connecting the pipes to the Outdoor
unit
•Align the center of the pipings and sufficiently
tighten the flare nut with fingers.
•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.
Checking the Drainage
•Remove the Air Filter.
•Check the drainage.
- Spray one or two glasses of water upon the
evaporator.
- Ensure that water flows drain hose of indoor
unit without any leakage.
Torque wrench
Outdoor unit
Gas side piping
(Bigger Dia.)
Liquid side piping
(Smaller Dia.)
Pipe size Torque
1/4" 1.8kg.m
3/8" 4.2kg.m
1/2" 5.5kg.m
5/8" 6.6kg.m
3/4" 6.6kg.m