LG LBUH366GSS0 User manual

LG Concealed Duct
Air Conditioner
INSTALLATION MANUAL
LG
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.

2Concealed Duct Air Conditioner
Ceiling Duct Type Air Conditioner Installation Manual
TABLE OF CONTENTS
Safety Precautions..............3
Introduction .........................8
Installation of Indoor,
Outdoor Unit ........................9
Connecting Pipes to the
Indoor Unit .........................19
Connecting Pipes to the
Outdoor Unit ......................21
Checking the Drainage .....21
Connecting Cables
between Indoor Unit and
Outdoor Unit ......................22
Air Purging and
Evacuation .........................26
Group Control....................28
Two Thermistor system ....28
E.S.P.(External Static
Pressure) Setting ..............29
How to Set E.S.P? .............29
External Static Pressure &
air Flow...............................31
Checking the Power Cord &
Test Running .....................32
Installation Guide at the
Seaside...............................33
Installation
Requirements Required Parts Required Tools
• Four Type “A” screws
• Connecting cable
• Level
• Screw driver
• Electric drill
• Hole core drill (ø70mm)
• Pipes: Gas side .....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

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.
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.
• 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 circuit
and breaker.
• Improper wiring or installation may
cause fire or electric shock
Use the correctly rated breaker
or fuse.
• There is risk of fire or electric shock.
Safety Precautions
Installation Manual 3
Safety Precautions

■Operation
Do not modify or extend the
power cable.
• There is risk of fire or electric shock.
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 condenser and
evaporator.
For installation, always contact
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
conditioner 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.
Do not store or use flammable
gas or combustibles near the
product.
• There is risk of fire or failure of product.
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.
Gasolin
4Concealed Duct Air Conditioner
Safety Precautions
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.

Safety Precautions
Installation Manual 5
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 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 disconnect 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 product from the window
before the hurricane arrives.
• There is risk of property
damage, failure of product,
or electric shock.
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,
disconnect the power supply plug or turn off the
breaker.
• There is risk of product damage or failure, or
unintended operation.
Take care to ensure that nobody could step on
or fall onto the outdoor unit.
• This could result in personal injury and
product damage.

6Concealed Duct Air Conditioner
Safety Precautions
■Installation
CAUTION
Always 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.
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.
90°
90°
Use two or more people to lift and transport the
product.
•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 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.
Do not block the inlet or outlet of air flow.
•It may cause product failure.
■Operation

Do not step on or put anyting on the product.
(outdoor units)
•There is risk of personal injury and failure of
product.
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.
Do not drink the water drained from the product.
•It is not sanitary and could cause serious
health issues.
Use a firm stool or ladder when cleaning or
maintaining the product.
•Be careful and avoid personal injury.
Replace the all batteries in the remote control with
new ones of the same type. Do not mix old and new
batteries or different types of batteries.
•There is risk of fire or explosion
Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.
•They may burn or explode.
If the liquid from the batteries gets onto your
skin or clothes, wash it well with clean water. Do
not use the remote if the batteries have leaked.
•The chemicals in batteries could cause burns
or other health hazards.
Safety Precautions
Installation Manual 7

8Concealed Duct Air Conditioner
Installation Parts Provided
Air filters
Air outlet vents
Air intake vents
Remote Controller
(Side) (Rear)
Air intake vents
Air outlet vents
Piping
Drain hose
Connecting wire
Control cover
(Side) (Rear)
Air outlet
vents
Air intake
vents
Connecting Wire
Drain Hose
Connection Pipe
Control Cover
Air intake
vents
Piping
Drain hose
Connecting
wire
Control cover
Air outlet vents
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

Installation Manual 9
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.
•Take the weight of the air conditioner into
account and select a place where noise and
vibration are minimum.
•Select a place where the warm air and noise
from the air conditioner do not disturb
neighbors.
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
More than
90cm
More than 90cm
More than 120cm
More than
90cm
Fence or
obstacles
Fence or
Fence or
obstacles
obstacles
Fence or
obstacles

10 Concealed Duct Air Conditioner
Installation of Indoor, Outdoor Unit
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
CAUTION:
•If 60k Model is installed at a distance of 15m, 600g of refrigerant
should be added (15-7.5) x 80g = 600g
•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.
Gas Liquid Standard Max. Standard Max .
30k Btu/h 15.88(5/8") 6.35(1/4") 7.5 50 5 30 45
36k Btu/h(1Ø) 15.88(5/8") 6.35(1/4") 7.5 50 5 30 60
36k Btu/h(3Ø) 15.88(5/8") 6.35(1/4") 7.5 50 5 30 40
42k Btu/h 19.05(3/4") 9.52(3/8") 7.5 50 5 30 60
48k Btu/h 19.05(3/4") 9.52(3/8") 7.5 50 5 30 70
60k Btu/h 19.05(3/4") 9.52(3/8") 7.5 50 5 30 80
Capacity
Pipe Size Length A(m) Elevation B(m)
*Additional
(Diameter:Ø)refrigerant(g/m)

Installation Manual 11
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)
1282 1230 477 56 590 30 120 1006 294
48k/60k Btu/h
1232 1180 355 45.5 450 30 87 830 186
30k/36k/42k Btu/h
Dimension
Capacity
ABCDE F(G)HI

12 Concealed Duct Air Conditioner
Installation of Indoor, Outdoor Unit
•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

Installation Manual 13
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

14 Concealed Duct Air Conditioner
Installation of Indoor, Outdoor Unit
•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.
CAUTION: Cutting line of
insulation must look upper
direction. Thickness of
insulation is 7mm or over.
Recommended Insulation
material
Meterial: FOAM PE
Thickness : 10mm
Density : less than 0.032±0.005(g/cm2)
Thermal conductivity : less than
0.03(kcal/m.hr.°C)
NOTICE
■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

Installation Manual 15
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.

16 Concealed Duct Air Conditioner
Installation of Indoor, Outdoor Unit
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

Installation Manual 17
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
* One side must be 90Cm for service.
Two of the remaining three sides may be 30Cm.
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.
Above 70Cm
Above 30Cm
Outdoor unit
Above 30Cm Above 50Cm
Face of wall
Above 90Cm
*Above 90Cm
Above
90Cm
Above
90Cm
Capacity Additional refrigerant(g/m)
30k Btu/h 45
36k Btu/h(1Ø) 60
36k Btu/h(3Ø) 40
42k Btu/h 60
48k Btu/h 70
60k Btu/h 80

18 Concealed Duct Air Conditioner
Installation of Indoor, Outdoor Unit
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
30k Btu/h 30A -
36k Btu/h 35A 25A
42k Btu/h - 25A
48k Btu/h - 25A
60k Btu/h - 30A

Installation Manual 19
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"
6.35(1/4") 1.1~1.3
9.52(3/8") 1.5~1.7
12.70(1/2") 1.6~1.8
15.88(5/8") 1.6~1.8
19.05(3/4") 1.9~2.1
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 =

20 Concealed Duct Air Conditioner
Connecting Pipes to the Indoor Unit
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.