LG LB-H60BESA0 User manual

LG
Ceiling Duct-Type Air Conditioner
INSTALLATION MANUAL
LG
MODELS: LB-H60BESA0
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 .........................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 of the
Connecting Pipes and the
Indoor Unit.........................25
Group Control....................26
Two Thermistor system....26
Static Pressures &
Air Flow Rate .....................27
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
Safety Precautions
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 to properties only.
■Installation
Be sure not to do.
Be sure to follow the instruction.
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.

4Ceiling Duct Type Air Conditioner
Safety Precautions
■Operation
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
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.
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.
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
ENGLISH
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.
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 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.
Do not open the inlet grill of the
product during operation. (Do
not touch the electrostatic 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.
Gasolin

6Ceiling Duct Type Air Conditioner
Safety Precautions
■Operation
■Installation
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.
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.
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.
90°
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.

Safety Precautions
Installation Manual 7
ENGLISH
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,
solvents, 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.
Do not step on or put
anyting on the product.
(outdoor units)
•There is risk of personal
injury and failure of product.
Always insert the filter securely.
Clean the filter every two weeks
or more often if necessary.
• A dirty filter reduces the
efficiency of the air conditioner
and could cause product
malfunction or damage.
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
Wax
Thinner
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.

8Ceiling Duct Type Air Conditioner
Installation Parts Provided
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

Installation Manual 9
ENGLISH
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

10 Ceiling Duct Type 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
If piping length is more than 5m
85
Capacity
Gas
3/4" Liquid 1/2"
Elevation B(m)
Length A(m)
*Additional
refrigerant
(g/m)
Pipe Size
(Diameter: Ø)
Standard
7.5 Standard 5
Max.
50 Max. 30
60k Btu/h(3ø)
CAUTION:
•If 60k Model is installed at a distance of 50m, 3612.5g of refrigerant
should be added (50-7.5) x 85g = 3612.5g
•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.

Installation Manual 11
ENGLISH
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)
60K BTU/h 1292 1230 570.5 54 680 30 120 1006 294
Dimension
Capacity
A B C D E F (G) H I

12 Ceiling Duct Type 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
ENGLISH
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 Ceiling Duct Type 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.
■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
ENGLISH
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 Ceiling Duct Type 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
AUTOSWINGOPERATION
FANSPEED
Programset
SUBFUNCTION
SETTEMP
RoomTemp
HI
MED
LO
Heater
Defrost
Filter
Preheat
Outdoor
Time
Timer
On
Setno.Time
Off010305070911131517192123
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
ENGLISH
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
60k Btu/h(3ø) 85 g/m

18 Ceiling Duct Type 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 3 Phase
60k Btu/h 50A

Installation Manual 19
ENGLISH
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 =

20 Ceiling Duct Type 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.