LG ZRUM080LTS6 User manual

INSTALLATION MANUAL
AIR
CONDITIONER
www.lg.com
Please read this installation manual completely before installing the product.
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.
For Heat Pump / Heat Recovery system
Original instruction
Copyright © 2023 LG Electronics Inc. All Rights Reserved.
MFL71987502
Rev.00_030623
ENGLISH
PORTUGUÊS
ITALIANO
MAGYAR
ESPAÑOL
БЪЛГАРСKN
FRANÇAIS
SRPSKI
DEUTSCH
HRVATSKI
ΕΛΛΗΝΙΚΆ
SVENSKA
ČEŠTINA
NORSK
NEDERLANDS
SUOMI
POLSKI
DANSK
LIMBA ROMÂNĂ

2
ENGLISH
WARNING
• Installation or repairs made by unqualified
persons can result in hazards to you and others.
• The information contained in the manual is
intended for use by a qualified service
technician familiar with safety procedures
and equipped with the proper tools and test
instruments.
• Failure to carefully read and follow all
instructions in this manual can result in
equipment malfunction, property damage,
personal injury and/or death.
• If the supply cord is damaged, it must be
replaced by the manufacturer, its service
agent or similarly qualified persons in order to
avoid a hazard.
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 install a dedicated circuit and breaker.
- Improper wiring or installation may cause
fire or electric shock.
• 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 cool excessively indoors. This may be harmful for your
health and may consume more electricity.
• Block sunlight with blinds or curtains while you are operating the
air conditioner.
• Keep doors or windows closed tightly while you are operating the
air conditioner.
• Adjust the direction of the air flow vertically or horizontally to
circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, in a short
period of time.
• Open windows regularly for ventilation as the indoor air quality
may deteriorate if the air conditioner is used for many hours.
• Clean the air filter once every 2 weeks. Dust and impurities
collected in the air filter may block the air flow or weaken the
cooling / dehumidifying functions.
For your records
Staple your receipt to this page in case you need it to prove the date of
purchase or for warranty purposes. Write the model number and the
serial number here:
Model number :
Serial number :
You can find them on a label on the side of each unit.
Dealer’s name :
Date of purchase :
IMPORTANT SAFETY
INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USING
THE APPLIANCE.
Always comply with the following precautions
to avoid dangerous situations and ensure peak
performance of your product.
WARNING
It can result in serious injury or death when the
directions are ignored.
CAUTION
It can result in minor injury or product damage
when the directions are ignored.
!
!
TIPS FOR SAVING ENERGY
Here are some tips that will help you minimize the power consumption
when you use the air conditioner.
You can use your air conditioner more efficiently by referring to the
instructions below:

3
ENGLISH
• 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
topple and result in injury.
• Do not install the product on a defective
installation stand.
- It may cause injury, accident, or damage to
the product.
• Use a vacuum pump or Inert(nitrogen) gas
when doing leakage test or air purge. Do not
compress air or Oxygen and do not use
Flammable gases. Otherwise, it may cause
fire or explosion.
- There is the risk of death, injury, fire or
explosion.
• When installing and moving the air
conditioner 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.
• 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 exceeded. Should the refrigerant leak
and cause the safety limit to be exceeded,
hazards due to lack of oxygen 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.
• 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 grille 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.

4
ENGLISH
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.
• 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 installing the unit in a hospital,
communication station, or similar place,
provide sufficient protection against noise.
- The inverter equipment, private power
generator, high-frequency medical
equipment, or radio communication
equipment may cause the air conditioner 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.
• Do not install the unit in potentially explosive
atmospheres.
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 cable may not be applied
to the terminals.
- Inadequate connection and fastening may
generate heat and cause a fire.
• 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, 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 fingers.
- 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.
!

5
ENGLISH
• 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 6 hours before
starting operation.
- 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
outdoor units. Auto-addressing should also
be done in case of changing the indoor unit
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.
• Means for disconnection must be
incorporated in the fixed wiring in accordance
with the wiring rules.
• Mechanical connections (mechanical
connectors or flared joints) shall be
accessible for maintenance purposes.
Pipe-work shall be protected from physical
damage.
When mechanical connectors are reused
indoors, sealing parts shall be renewed.
When flared joints are reused indoors, the
flare part shall be re-fabricated.
The appliance shall be installed in accordance
with national wiring regulations.
For installations with field applied mechanical
joints which are exposed in the occupied
space, the instructions shall state that a
sensor shall be located
• Remote located within 2 m horizontal
distance in line of sight of the unit and on a
wall within the room in which the unit is
installed; and
- 100 mm above the floor where h0is not
more than 300 mm from the floor: or
- 300 mm above the floor where h0is greater
than 300 mm from the floor.
The supply and return air shall be directly
ducted to the space.
Open areas such as false ceilings shall not be
used as a return air duct.
servicing shall be performed only as
recommended by the manufacturer.

6
ENGLISH
Safety precautions for R32 model
• Do not use means to accelerate the
defrosting process or to clean, other than
those recommended by the manufacturer.
• The appliance shall be stored in a room
without continuously operating ignition
sources (for example: open flames, an
operating gas appliance or an operating
electric heater.)
• Do not pierce or burn.
• Be aware that refrigerants may not contain
an odour.
• Keep any required ventilation openings clear
of obstruction
• Auxiliary devices which may be a potential
ignition source shall not be installed in the
duct work. Examples of such potential
ignition sources are hot surfaces with a
temperature exceeding X°C and electric
switching devices.
• Only auxiliary devices approved by the
appliance manufacturer or declared suitable
with the refrigerant shall be installed in
connecting ductwork.
• The appliance shall be stored so as to
prevent mechanical damage from occurring.
The manufacturer should specify other
potential continuously operating sources
known to cause ignition of the refrigerant
used.
• Compliance with national gas regulations
shall be observed
• Refrigerant tubing shall be protected or
enclosed to avoid damage.
• The installation of pipe-work shall be kept to
a minimum
• A brazed, welded, or mechanical connection
shall be made before opening the valves to
permit refrigerant to flow between the
refrigerating system parts.
• Any person who is involved with working on
or breaking into a refrigerant circuit should
hold a current valid certificate from an
industry-accredited assessment authority,
which authorises their competence to handle
refrigerants safely in accordance with an
industry recognised assessment
specification.
• Servicing shall only be performed as
recommended by the equipment
manufacturer.
Maintenance and repair requiring the
assistance of other skilled personnel shall be
carried out under the supervision of the
person competent in the use of flammable
refrigerants.
• Periodic cleaning of the dust of salt particles
stuck on the heat exchanger by using water.
• Dismantling the unit, treatment of the
refrigerant oil and eventual parts should be
done in accrodance with local and national
standards.
• Checks to the area
Prior to beginning work on systems
containing flammable refrigerants, safety
checks are necessary to ensure that the risk
of ignition is minimised. For repair to the
refrigerating system, the following
precautions shall be complied with prior to
conducting work on the system.
• Work procedure
Work shall be undertaken under a controlled
procedure so as to minimise the risk of a
flammable gas or vapour being present while
the work is being performed.
This appliance is filled with flammable
refrigerant (for R32)
This symbol indicates that the
Operation Manual should be read
carefully.
This symbol indicates that a service
personnel should be handling this
equipment with reference to the
Installation Manual.
Read the precautions in this manual
carefully before operating the unit.

7
ENGLISH
• General work area
All maintenance staff and others working in
the local area shall be instructed on the
nature of work being carried out. Work in
confined spaces shall be avoided.
• Checking for presence of refrigerant
The area shall be checked with an
appropriate refrigerant detector prior to and
during work, to ensure the technician is
aware of potentially flammable atmospheres.
Ensure that the leak detection equipment
being used is suitable for use with flammable
refrigerants, i.e. non-sparking, adequately
sealed or intrinsically safe.
• Presence of fire extinguisher
If any hot work is to be conducted on the
refrigerating equipment or any associated
parts, appropriate fire extinguishing
equipment shall be available to hand. Have a
dry powder or CO2 fire extinguisher adjacent
to the charging area.
• No ignition sources
No person carrying out work in relation to a
refrigerating system which involves exposing
any pipe work that contains or has contained
flammable refrigerant shall use any sources of
ignition in such a manner that it may lead to
the risk of fire or explosion.
All possible ignition sources, including
cigarette smoking, should be kept sufficiently
far away from the site of installation, repairing,
removing and disposal, during which
flammable refrigerant can possibly be
released to the surrounding space.
Prior to work taking place, the area around the
equipment is to be surveyed to make sure
that there are no flammable hazards or ignition
risks. “No Smoking” signs shall be displayed.
•Checks to the refrigerating equipment
Where electrical components are being
changed, they shall be fit for the purpose and
to the correct specification. At all times the
manufacturer’s maintenance and service
guidelines shall be followed. If in doubt
consult the manufacturer’s technical
department for assistance.
The following checks shall be applied to
installations using flammable refrigerants:
- The actual refrigerant charge is in
accordance with the room size within which
the refrigerant containing parts are installed
- The ventilation machinery and outlets are
operating adequately and are not obstructed
- If an indirect refrigerating circuit is being
used, the secondary circuit shall be checked
for the presence of refrigerant
- Marking to the equipment continues to be
visible and legible. Markings and signs that
are illegible shall be corrected
- Refrigerating pipe or components are
installed in a position where they are
unlikely to be exposed to any substance
which may corrode refrigerant containing
components, unless the components are
constructed of materials which are
inherently resistant to being corroded or are
suitably protected against being so
corroded.
• Checks to electrical devices
Repair and maintenance to electrical
components shall include initial safety checks
and component inspection procedures.
If a fault exists that could compromise
safety, then no electrical supply shall be
connected to the circuit until it is
satisfactorily dealt with. If the fault cannot be
corrected immediately but it is necessary to
continue operation, an adequate temporary
solution shall be used. This shall be reported
to the owner of the equipment so all parties
are advised.
Initial safety checks shall include:
- Capacitors are discharged: this shall be
done in a safe manner to avoid possibility of
sparking.
- No live electrical components and wiring are
exposed while charging, recovering or
purging the system.
- Continuity of earth bonding

8
ENGLISH
• Repairs to sealed components
During repairs to sealed components, all
electrical supplies shall be disconnected from
the equipment being worked upon prior to
any removal of sealed covers, etc.
If it is absolutely necessary to have an
electrical supply to equipment during
servicing, then a permanently operating form
of leak detection shall be located at the most
critical point to warn of a potentially
hazardous situation.
Particular attention shall be paid to the
following to ensure that by working on
electrical components, the casing is not
altered in such a way that the level of
protection is affected.
This shall include damage to cables,
excessive number of connections, terminals
not made to original specification, damage to
seals, incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have
not degraded such that they no longer serve
the purpose of preventing the ingress of
flammable atmospheres.
Replacement parts shall be in accordance
with the manufacturer’s specifications.
• Repair to intrinsically safe components
Do not apply any permanent inductive or
capacitance loads to the circuit without
ensuring that this will not exceed the
permissible voltage and current permitted for
the equipment in use.
Intrinsically safe components are the only
types that can be worked on while live in the
presence of a flammable atmosphere.
The test apparatus shall be at the correct
rating. Replace components only with parts
specified by the manufacturer.
Other parts may result in the ignition of
refrigerant in the atmosphere from a leak.
NOTE: The use of silicon sealant can inhibit
the effectiveness of some types of
leak detection equipment. Intrinsically
safe components do not have to be
isolated prior to working on them.
• Decommissioning
Before carrying out this procedure, it is
essential that the technician is completely
familiar with the equipment and all its detail.
It is recommended good practice that all
refrigerants are recovered safely.
Prior to the task being carried out, an oil and
refrigerant sample shall be taken in case
analysis is required prior to re-use of
recovered refrigerant. It is essential that
electrical power is available before the task is
commenced.
a) Become familiar with the equipment and
its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure
that:
- Mechanical handling equipment is
available, if required, for handling
refrigerant cylinders
- All personal protective equipment is
available and being used correctly
- The recovery process is supervised at all
times by a competent person
- Recovery equipment and cylinders
conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a
manifold so that refrigerant can be
removed from various parts of the system.
f) Make sure that cylinder is situated on the
scales before recovery takes place.
g) Start the recovery machine and operate in
accordance with manufacturer's
instructions.
h) Do not overfill cylinders. (No more than
80 % volume liquid charge).
i) Do not exceed the maximum working
pressure of the cylinder, even temporarily.
j) When the cylinders have been filled
correctly and the process completed, make
sure that the cylinders and the equipment
are removed from site promptly and all
isolation valves on the equipment are
closed off.
k) Recovered refrigerant shall not be charged
into another refrigerating system unless it
has been cleaned and checked.

9
ENGLISH
• Labelling
Equipment shall be labelled stating that it has
been de-commissioned and emptied of
refrigerant. The label shall be dated and
signed. Ensure that there are labels on the
equipment stating the equipment contains
flammable refrigerant.
●Ventilated area
Ensure that the area is in the open or that it
is adequately ventilated before breaking into
the system or conducting any hot work. A
degree of ventilation shall continue during
the period that the work is carried out. The
ventilation should safely disperse any
released refrigerant and preferably expel it
externally into the atmosphere.
●Cabling
Cabling will not be subject to wear,
corrosion, excessive pressure, vibration,
sharp edges or any other adverse
environmental effects. The check shall also
take into account the effects of ageing or
continual vibration from sources such as
compressors or fans.
●Detection of flammable refrigerants
Under no circumstances shall potential
sources of ignition be used in the searching
for or detection of refrigerant leaks. A halide
torch (or any other detector using a naked
flame) shall not be used.
●Leak detection methods
The following leak detection methods are
deemed acceptable for systems containing
flammable refrigerants.
Electronic leak detectors shall be used to
detect flammable refrigerants, but the
sensitivity may not be adequate, or may need
re-calibration. (Detection equipment shall be
calibrated in a refrigerant-free area.)
Ensure that the detector is not a potential
source of ignition and is suitable for the
refrigerant used.
Leak detection equipment shall be set at a
percentage of the LFL of the refrigerant and
shall be calibrated to the refrigerant
employed and the appropriate percentage of
gas (25 % maximum) is confirmed.
Leak detection fluids are also suitable for use
with most refrigerants but the use of
detergents containing chlorine shall be
avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work.
NOTE: Examples of leak detection fluids are
- bubble method
- fluorescent method agents
If a leak is suspected, all naked flames shall
be removed/extinguished.
If a leakage of refrigerant is found which
requires brazing, all of the refrigerant shall be
recovered from the system, or isolated (by
means of shut off valves) in a part of the
system remote from the leak. Removal of
refrigerant shall be according to removal and
evacuation procedure.
●Removal and evacuation
When breaking into the refrigerant circuit to
make repairs - or for any other purpose –
conventional procedures shall be used.
However, for flammable refrigerants it is
important that best practice is followed since
flammability is a consideration.
The following procedure shall be adhered to:
- Remove refrigerant;
- Purge the circuit with inert gas (optional for
A2L);
- Evacuate (optional for A2L);
- Purge with inert gas (optional for A2L);
- Open the circuit by cutting or brazing
The refrigerant charge shall be recovered into
the correct recovery cylinders. For appliances
containing flammable refrigerants other than
A2L refrigerants, the system shall be purged
with oxygen-free nitrogen to render the
appliance safe for flammable refrigerants.
This process may need to be repeated
several times.

10
ENGLISH
Compressed air or oxygen shall not be used
for purging refrigerant systems.
For appliances containing flammable
refrigerants, other than A2L refrigerants,
refrigerants purging shall be achieved by
breaking the vacuum in the system with
oxygen-free nitrogen and continuing to fill
until the working pressure is achieved, then
venting to atmosphere, and finally pulling
down to a vacuum. This process shall be
repeated until no refrigerant is within the
system. When the final oxygen-free nitrogen
charge is used, the system shall be vented
down to atmospheric pressure to enable
work to take place. This operation is
absolutely vital if brazing operations on the
pipe-work are to take place.
Ensure that the outlet for the vacuum pump
is not close to any potential ignition sources
and that ventilation is available.
●Charging procedures
In addition to conventional charging
procedures, the following requirements shall
be followed.
- Ensure that contamination of different
refrigerants does not occur when using
charging equipment. Hoses or lines shall be
as short as possible to minimise the amount
of refrigerant contained in them.
- Cylinders shall be kept in an appropriate
position according to the instruction.
- Ensure that the refrigerating system is
earthed prior to charging the system with
refrigerant.
- Label the system when charging is
complete (if not already).
- Extreme care shall be taken not to overfill
the refrigerating system.
Prior to recharging the system, it shall be
pressure tested with the appropriate purging
gas. The system shall be leak-tested on
completion of charging but prior to
commissioning. A follow up leak test shall be
carried out prior to leaving the site.
●Recovery
When removing refrigerant from a system,
either for servicing or decommissioning, it is
recommended good practice that all
refrigerants are removed safely.
When transferring refrigerant into cylinders,
ensure that only appropriate refrigerant
recovery cylinders are employed.
Ensure that the correct number of cylinders
for holding the total system charge are
available. All cylinders to be used are
designated for the recovered refrigerant and
labelled for that refrigerant (i.e. special
cylinders for the recovery of refrigerant).
Cylinders shall be complete with pressure
relief valve and associated shut-off valves in
good working order.
Empty recovery cylinders are evacuated and,
if possible, cooled before recovery occurs.
The recovery equipment shall be in good
working order with a set of instructions
concerning the equipment that is at hand and
shall be suitable for the recovery of
flammable refrigerants. In addition, a set of
calibrated weighing scales shall be available
and in good working order.
Hoses shall be complete with leak-free
disconnect couplings and in good condition.
Before using the recovery machine, check
that it is in satisfactory working order, has
been properly maintained and that any
associated electrical components are sealed
to prevent ignition in the event of a
refrigerant release.
Consult manufacturer if in doubt. The
recovered refrigerant shall be returned to the
refrigerant supplier in the correct recovery
cylinder, and the relevant Waste Transfer
Note arranged.
Do not mix refrigerants in recovery units and
especially not in cylinders. If compressors or
compressor oils are to be removed, ensure
that they have been evacuated to an
acceptable level to make certain that
flammable refrigerant does not remain within
the lubricant.

11
ENGLISH
The evacuation process shall be carried out
prior to returning the compressor to the
suppliers. Only electric heating to the
compressor body shall be employed to
accelerate this process. When oil is drained
from a system, it shall be carried out safely.
●Qualification of workers
The manual shall contain specific information
about the required qualification of the
working personnel for maintenance, service
and repair operations. Every working
procedure that affects safety means shall
only be carried out by competent persons
according to Annex HH.
Examples for such working procedures are:
- breaking into the refrigerating circuit;
- opening of sealed components;
- opening of ventilated enclosures.

12
ENGLISH
35 ELECTRICAL WIRING
35 Caution
36 Control box and connecting position of wiring
36 Communication and Power Cables
36 Separation of communication and power cables
37 Wiring of main power supply and equipment capacity
37 Point for attention regarding quality of the public electric power
supply
38 Field Wiring
39 Checking the setting of outdoor units
40 Setting For Heat Recovery Unit
40 Switch for setup of HR Unit
42 Automatic Addressing
43 The Procedure of Automatic Addressing
44 Flow chart of auto pipe detection process
44 Flow chart of manual addressing for pipe detection
44 Group Number setting
45 Cool & Heat selector
46 High Static Pressure Compensation mode
46 Night Low Noise Function
46 Overall defrost mode
46 Setting the ODU address
47 Snow removal & rapid defrost
47 Setting Capacity Up Airflow Adjusting for IDU (Heating)
47 Target pressure adjusting
47 Low Ambient Kit
48 Auto Dust Removal Mode
48 Compressor Max. Frequency Limit
48 ODU Fan Max. RPM Limit
48 SLC (Smart Load Control)
49 Humidity Reference
49 Central Control Connection at Indoor Unit side
49 Compressor Input Current Limit
49 Power Consumption Display on wired remote controller
50 Overall Defrost Operating in Low temperature (Heating)
50 Base pan Heater operation
50 Target Noise Control
50 Comfort Cooling operation
51 LG AI engine connection information setting option
51 LG AI engine function
55 Self-Diagnosis Function
58 SPECIAL REQUIREMENTS
58 Flow chart
61 INSTALLATION GUIDE AT THE SEASIDE
61 Model Designation
61 Airborne Noise Emission
2TIPS FOR SAVING ENERGY
2IMPORTANT SAFETY INSTRUCTIONS
13 INSTALLATION PROCESS
13 OUTDOOR UNITS INFORMATION
13 SELECT THE BEST LOCATION
15 INSTALLATION SPACE
15 Individual Installation
15 LIFTING METHOD
16 INSTALLATION
16 The location of the Anchor bolts
16 Foundation for Installation
17 Preparation of Piping
18 Plumbing materials and storage methods
19 REFRIGERANT PIPING INSTALLATION
<For Heat Pump System Installation>
19 Precautions on Pipe connection / Valve operation
19 Caution
<For Heat Recovery System Installation>
20 Precautions on Pipe connection / Valve operation
20 Installation procedure for HR unit
21
Installation of Outdoor Unit, HR Unit, Indoor Unit Refrigerant Pipe
21 Type of HR Unit
21 Installation of Zoning Control
22 Caution
23 PIPE CONNECTIONS BETWEEN INDOOR
AND OUTDOOR UNIT
<For Heat Pump System Installation>
23 Preparation Work
23 Pipe Drawing Out during Single / Series connection
24 Refrigerant piping system
<For Heat Recovery System Installation>
24 Preparation Work
25 Pipe Drawing Out during Single / Series connection
25 Refrigerant piping system
<For Heat Pump And Heat Recovery System Installation>
28 Pipe Connection Method between outdoor unit/indoor unit
29 Branch pipe Fitting
31 Distribution Method
31 Vacuum Mode
32 Leak Test and Vacuum drying
33 Refrigerant charging
34 Thermal insulation of refrigerant piping
TABLE OF CONTENTS

13
ENGLISH
SELECT THE BEST LOCATION
Select space for installing outdoor unit, which will meet the following
conditions:
• No direct thermal radiation from other heat sources
• No possibility of annoying neighbors due to noise of unit
• No exposition to strong wind
• With strength which bears weight of unit
• Note that drain flows out of unit when heating
• Because of the possibility of fire, do not install unit to the space
where generation, inflow, stagnation, and leakage of combustible gas
is expected.
• Avoid unit installation in a place where acidic solution and spray
(sulfur) are often used.
• Do not use unit under any special environment where oil, steam and
sulfuric gas exist.
• It is recommended to fence round the outdoor unit in order to
prevent any person or animal from accessing the outdoor unit.
• If installation site is area of heavy snowfall, then the following
directions should be observed.
- Make the foundation as high as possible.
- Fit a snow protection hood.
• Select installation location considering following conditions to avoid
bad condition when additionally performing defrost operation.
- Install the outdoor unit at a place well ventilated and having a lot of
sunshine in case of installing the product at a place With a high
humidity in winter (near beach, coast, lake, etc.)
(Ex : Rooftop where there is always sunshine.)
CAUTION
• The above list indicates the order in which the individual work
operations are normally carried out but this order may be varied
where local conditions warrants such change.
• The thickness of the piping should comply with the relevant
local and national regulations for the designed pressure 3.8 MPa
(551.1 psi).
!
The foundation must be level even
Outdoor unit foundation work
Avoid short circuits and ensure
sufficient space is allowed for service
Installation of outdoor unit
Refer to automatic addressing flowchart
Automatic addressing of indoor unit
In the final check for 24 hours at 3.8 MPa (38.7 kgf/cm
2
)[551.1 psi]
there must be no drop in pressure.
Airtight test
Multiple core cable must not be used.
(suitable cable should be selected)
Electrical work
(connection circuits and drive circuits)
Make sure no gaps are left where
the insulating materials are joined
Heat insulation work
Make sure airflow is sufficient
Duct work
Adjust to downward gradient
Drain pipe work
Special attention to dryness,
cleanness and tightness
Refrigerant piping work
Check model name to
make sure the fitting
is made correctly
Installation of indoor unit
Take account of gradient
of drain piping
Sleeve and insert work
Make connection clearly between outdoor, indoor,
remote controller and option.
Preparation of contract drawings
Indicate clearly who will be responsible for switch setting.
Determination of division work
The vacuum pump used must have a capacity of reaching at least
5 torr, more than 1 hour
Vacuum drying
Recharge correctly as calculated in this manual. and record the
amount of added refrigerant
Additional charge of refrigerant
Make sure there are no gaps left between the facing materials
used on the ceiling
Fit facing panels
Run each indoor unit in turn to make sure the pipe work
has been fitted correctly
Test run adjustment
Explain the use of the system as clearly as possible to your customer and
make sure all relevant documentation is in order
Transfer to customer with explanation
Preheat the crank case with the electrical heater for more than 6 hours.
CAUTION
!
CAUTION
!
Notes : * We can guarantee the operation only within 130 %
combination. If you want to connect more than 130 %
combination, please contact us and discuss the
requirement like below.
• If the operation of indoor unit is more than 130 %, the airflow is
operated as low in the all indoor units.
Combination Ratio(50~200 %)
Outdoor Number Connection Ratio
Single outdoor units 200 %
• The wall thickness of the piping should comply with the relevant
local and national regulations for the designed pressure 3.8 MPa
[551.1 psi]
• Do not place the refrigerant container under the direct rays of
the sun to prevent it from exploding.
• For high-pressure refrigerant, any unapproved pipe must not be
used.
• Do not heat pipes more than necessary to prevent them from
softening.
OUTDOOR UNITS INFORMATIONINSTALLATION PROCESS

14
ENGLISH
Select installation location of the HR unit suitable for following
conditions
- Avoid a place where rain may enter since the HR unit is for indoor.
- Sufficient service space must be obtained.
- Refrigerant pipe must not exceed limited length.
- Avoid a place subject to a strong radiation heat from other heat
source.
- Avoid a place where oil spattering, vapor spray or high frequency
electric noise is expected.
- Install the unit at a place in which it is not affected by operation noise.
(Installation within cell such as meeting room etc. may disturb
business due to noise.)
- Place where refrigerant piping, drain piping and electrical wiring
works are easy.
[Unit: mm(inch)]
NOTE
!
• Be sure to install the inspection door at the control box side.
• If reducers are used, servicing space must be increased equal to
reducer's dimension.
For Heat Recovery Installation
No. Part Name
Type of HR unit
3 port / 4 port
6 port / 8 port 2 port
Description
1Low pressure Gas
pipe connection port
Ø 28.58 (1-1/8)
Brazing connection
Ø 22.2 (7/8) Brazing
connection
2High pressure Gas
pipe connection port
Ø 22.2 (7/8) Brazing
connection
Ø 19.05 (3/4) Brazing
connection
3Liquid pipe
connection port
Ø 15.88 (5/8) Brazing
connection
(In a type of 3 port HR
unit, use Ø12.7 (1/2))
Ø 9.52 (3/8) Brazing
connection
4Indoor unit Gas pipe
connection port
Ø 15.88 (5/8) – Ø 12.7 (1/2)
Brazing connection
Ø 15.88 (5/8) – Ø 12.7 (1/2)
Brazing connection
5Indoor unit Liquid pipe
connection port
Ø 9.52 (3/8) – Ø 6.35 (1/4)
Brazing connection
Ø 9.52 (3/8) – Ø 6.35 (1/4)
Brazing connection
6 Control box - -
7 Hanger metal Suspension bolt M10
or M8
Suspension bolt
M10 or M8
500 (19-11/16)
311 (12-1/4)
127 (5)
147 (5-25/32)
19 (3/4) 52 (2-3/64)
390 (15-23/64)92 (3-5/8) 205 (8-5/64)
500 (19-11/16)
540 (21-17/64
157 (6-3/16) 157 (6-3/16)
486 (19-9/64)
167 (6-37/64
218 (8-37/64)
7
1
2
3
5
4
6
300 (11-12/16) more
300 (11-12/16) more
300 (11-12/16) more
450 (17-23/32) more
(Servicing space) (Servicing space)
(Servicing space)
(Servicing space)
100 (3-15/16) more
Servicing space)
100 (3-15/16) more
Servicing space)
Inspection door
(servicing space)
2 port / 3port / 4 port HR unit
6 port / 8 port HR unit
7
311 (12-1/4)
809 (31-27/32)
793 (31-7/32)
160 (6-19/64)
218 (8-37/64)
166 (6-17/32)
1
2
3
19 (3/4) 53 (2-3/32)
389 (15-5/16)
92 (3-5/8) 207 (8-5/32)
147 (5-25/32)
126 (4-61/64)
5
4
6
540 (21-17/64)
800 (31-1/2)
160 (6-19/64)
300 (11-12/16) more
300 (11-12/16) more
300 (11-12/16) more
450 (17-23/32) more
(Servicing space) (Servicing space)
(Servicing space) (Servicing space)
100 (3-15/16) more
(Servicing space)
100 (3-15/16) more
(Servicing space)
Inspection door
(servicing space)
[Unit: mm(inch)]
[Unit: mm(inch)]

15
ENGLISH
Limitations
on the
height
of the
wall
(Refer
to 4
side
walls)
h2
h1
1 500 (59)
Inlet
side
A
B
50500
(19-11/16’’)(19-11/16’’)
500
(19-11/16’’)
Front
side
500
(19-11/16’’)
240
(9-1/2’’)
or more
50 (2) or more
45° or
more
• The height of the wall on the front side must
be 1500 mm (59 inch) or less.
• The height of the wall on the inlet side must
be 500 mm (19-11/16 inch) or less.
• There is no limit to the wall on the side.
• If the height of the walls on the front and the
side are higher than the limit, there must be
additional space on the front and the side.
- Additional Space on the front side by 1/2 of h1
- Additional Space on the inlet side by 1/2 of h2
- h1 = A(Actual height) - 1 500 mm (59 inch)
- h2 = B(Actual height) - 500 mm (19-11/16 inch)
Seasonal wind and cautions in winter
• Sufficient measures are required in a snow areas or severe cold
areas in winter so that product can be operated well.
• Get ready for seasonal wind or snow in winter even in other areas.
• Install a suction and discharge duct not to let in snow or rain.
• Install the outdoor unit In such a way that it should not come in
contact with snow directly. If snow piles up and freezes on the air
suction hole, the system may malfunction. If it is installed at snowy
area, attach the hood to the system.
• The raised support platform must be high enough to allow the unit to
remain above possible snow drifts, and must be higher than the
maximum anticipated snowfall for the location.
• Where snow accumulated on the upper part of the Outdoor Unit by
more than 10 cm (3.9 inch), always remove snow for operation.
- Don't install the suction hole and discharge hole of the Outdoor
Unit facing the seasonal wind.
• When carrying the suspended, unit pass the ropes under the unit and
use the two suspension points each at the front and rear.
• Always lift the unit with ropes attached at four points so that impact
is not applied to the unit.
• Attach the ropes to the unit at an angle of 40° or less.
Forklift Carrying Guide
Forklift Carrying Hole
Locking points for
transportation ropes
LIFTING METHOD
INSTALLATION SPACE
Individual Installation
During the installation of the unit, consider service, inlet, and outlet
acquire the minimum space as shown in the figures below.
Category Installation Space
Case 1
(10(13/32)≤Side
Space≤49(13/14))
Case 2
(Side Space
≥49(13/14))
4 sides
are
walls
A≥10 (13/32)
B≥300 (11-13/16)
C≥10 (13/32)
D≥500 (19-11/16)
A≥50 (1-31/32)
B≥100 (3-15/16)
C≥50 (1-31/32)
D≥500(19-11/16)
A≥10 (13/32)
B≥300 (11-13/16)
C≥10 (13/32)
D≥500 (19-11/16)
E≥20 (25/32)
A≥50 (1-31/32)
B≥100 (3-15/16)
C≥50 (1-31/32)
D≥500 (19-11/16)
E≥100 (3-15/16)
A≥10 (13/32)
B≥300 (11-13/16)
C≥10 (13/32)
D≥500 (19-11/16)
E≥20 (25/32)
F≥600 (23-5/8)
A≥50 (1-31/32)
B≥100 (3-15/16)
C≥50 (1-31/32)
D≥500 (19-11/16)
E≥100 (3-15/16)
F≥500 (19-11/16)
A≥10 (13/32)
B≥300 (11-13/16)
C≥10 (13/32)
D≥300 (11-13/16)
E≥20 (25/32)
F≥500 (19-11/16)
A≥50 (1-31/32)
B≥100 (3-15/16)
C≥50 (1-31/32)
D≥100 (3-15/16)
E≥100 (3-15/16)
F≥500 (19-11/16)
Rear
to
Rear
A≥10 (13/32)
B≥500 (19-11/16)
C≥10 (13/32)
D≥500 (19-11/16)
F≥900 (35-7/16)
A≥50 (1-31/32)
B≥500 (19-11/16)
C≥50 (1-31/32)
D≥500 (19-11/16)
F≥600 (23-5/8)
A≥10 (13/32)
B≥500 (19-11/16)
C≥10 (13/32)
D≥500 (19-11/16)
E≥20 (25/32)
F≥1 200 (47-1/4)
A≥50 (1-31/32)
B≥500 (19-11/16)
C≥50 (1-31/32)
D≥500 (19-11/16)
E≥100 (3-15/16)
F≥900 (35-7/16)
A≥10 (13/32)
B≥500 (19-11/16)
C≥10 (13/32)
D≥500 (19-11/16)
E≥20 (25/32)
F≥1 800 (70-7/8)
A≥50 (1-31/32)
B≥500 (19-11/16)
C≥50 (1-31/32)
D≥500 (19-11/16)
E≥100 (3-15/16)
F≥1 200 (47-1/4)
Only 2
sides
are
walls
A≥10 (13/32)
B≥300 (11-13/16)
A≥200 (7-7/8)
B≥300 (11-13/16)
E≥400 (15-3/4)
500
(19-11/16’’)
ac
b
d
500
(19-11/16’’)
aeec
b
d
500
(19-11/16’’)
aec
b
f
d
500
(19-11/16’’)
aec
b
f
d
500
(19-11/16’’)
ac
b
f
d
500
(19-11/16’’)
aec
b
f
d
500
(19-11/16’’)
aeec
b
f
d
500
(19-11/16’’)
a
b
500
(19-11/16’’)
aee
b
Front
Front
Front Front
Front Front
Front
Front
Front
Front Front
Front Front
Front Front Front
Front
Front
Front
Front Front
No limit for the
height of wall
No limit for the height of wall
Front
[Unit : mm (inch)]
Remove the Rear Grille
• Remove the rear grille in snowy area.
• Make sure that heat exchanger should not be damaged.
Rear Grille

16
ENGLISH
• Install at places where it can endure the weight and vibration/noise
of the outdoor unit.
• The outdoor unit support blocks at the bottom shall have width of at
least 100 mm (3-15/16 inch) under the Unit’s legs before being fixed.
• The outdoor unit support blocks should have minimum height of
200 mm (7-7/8 inch).
• Anchor bolts must be inserted at least 75 mm (2-15/16 inch).
At least 100 mm
(3-15/16 inch)
At least 100 mm
(3-15/16 inch)
At least 100 mm
(3-15/16 inch)
At least 100 mm
(3-15/16 inch)
At least 100 mm
(3-15/16 inch)
At least 100 mm
(3-15/16 inch)
Outdoor units
should not be
supported only by
the corner supports.
Center of the Unit
Center of the Unit
• Fix the unit tightly with bolts as shown below so that unit will not fall
down due to earthquake or gust.
• Use the H-beam support as a base support
• Noise and vibration may occur from the floor or wall since vibration is
transferred through the installation part depending on installation
status. Thus, use anti-vibration materials (cushion pad) fully (The base
pad shall be more than 200 mm (7-7/8 inch)).
At least
200 (7.87)
760 (29-29/32)
731 (28-25/32)
A
B
65 (2-9/16)
65
(2-9/16)
65 (2-9/16)
65 (2-9/16)
At leastAt least
Unit : mm (inch)
200(7.87)
75(2.95)
75(2.95)
200(7.87)
100(3.94)
ⒶThe corner part must be fixed firmly. Otherwise, the support for the
installation may be bent.
ⒷGet and use M10 Anchor bolt.
ⒸPut Cushion Pad between the outdoor unit and ground support for
the vibration protection in wide area.
ⒹSpace for pipes and wiring (Pipes and wirings for bottom side)
ⒺH-beam support
ⒻConcrete support
• Be sure to remove the Pallet(Wood Support) of the bottom side
of the outdoor unit Base panel before fixing the bolt. It may
cause the unstable state of the outdoor settlement, and may
cause freezing of the heat exchanger resulting in abnormal
operations.
• Be sure to remove the Pallet(Wood Support) of the bottom side
of the outdoor unit before welding. Not removing Pallet(Wood
Support) causes hazard of fire during welding.
WARNING
• Install where it can sufficiently support the weight of the
outdoor unit.
If the support strength is not enough, the outdoor unit may drop
and hurt people.
• Install where the outdoor unit may not fall in strong wind or
earthquake.
If there is a fault in the supporting conditions, the outdoor unit
may fall and hurt people.
• Please take extra cautions on the supporting strength of the
ground, water outlet treatment(treatment of the water flowing
out of the outdoor unit in operation), and the passages of the
pipe and wiring, when making the ground support.
• Do not use tube or pipe for water outlet in the Base panel. Use
drainage instead for water outlet. The tube or pipe may freeze
and the water may not be drained.
!
Foundation for Installation
The location of the Anchor bolts
INSTALLATION
CAUTION
!
CAUTION
!
Chassis A B
UXA 930 (36-5/8) 730 (28-3/4)
Be very careful while carrying the product.
• Do not have only one person carry product if it is more than 20
kg (44 lbs).
• PP bands are used to pack some products. Do not use them as
a mean for transportation because they are dangerous.
• Do not touch heat exchanger fins with your bare hands.
Otherwise you may get a cut in your hands.
• Tear plastic packaging bag and scrap it so that children cannot
play with it. Otherwise plastic packaging bag may suffocate
children to death.
• When carrying in Outdoor Unit, be sure to support it at four
points. Carrying in and lifting with 3-point support may make
Outdoor Unit unstable, resulting in a fall.
• Use 2 belts of at least 8 m (26.2 ft) long.
• Place extra cloth or boards in the locations where the casing
comes in contact with the sling to prevent damage.
•
Hoist the unit making sure it is being lifted at its center of gravity.
Pallet(Wood Support)
- Remove before Installation
[Unit: mm(inch)]

17
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 below.
- If flare is noted to be defective, cut off the flared section and do
flaring work again.
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.
Bar
Copper pipe
"A"
<Wing nut type> <Clutch type>
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =
Flare shape and flare nut tightening torque
Opening shutoff valve
Precautions when connecting pipes
- See the following table for flare part machining dimensions.
- When connecting the flare nuts, apply refrigerant oil to the inside and
outside of the flares and turn them three or four times at first.
(Use ester oil or ether oil.)
-
See the following table for tightening torque.(Applying too much torque may
cause the flares to crack.)
- After all the piping has been connected, use nitrogen to perform a
gas leak check.
- Only Annealed pipe should be used for flared joint.
- The outside diameter of pipe should be smaller than 20 mm.
1Remove the cap and turn the valve counter clockwise with the
hexagon wrench.
2Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may
break the valve body, as the valve is not a backseat type. Always
use the special tool.
3Make sure to tighten the cap securely.
Pipe size
[mm (inch)]
Tightening Torque
N.m (lbs.ft) A [mm (inch)] Flare shape
Ø 9.52 (3/8) 38±4 (28±3.0) 12.8 (0.5)~13.2 (0.52)
90°±2
45°
±2
A
R=0.4~0.8
Ø 12.7 (1/2) 55±6 (41±4.4) 16.2 (0.64)~16.6 (0.65)
Ø 15.88 (5/8) 75±7 (55±5.2) 19.3 (0.76)~19.7 (0.78)
Union
Closing shutoff valve
1Remove the cap and turn the valve clockwise with the hexagon
wrench.
2Securely tighten the valve until the shaft contacts the main body seal.
3Make sure to tighten the cap securely.
* For the tightening torque, refer to the table on the below.
Tightening torque
Shut
off
valve
size
(mm
(inch))
Tightening torque N.m (lbs.ft) (Turn clockwise to close)
Shaft
(valve body)
Cap
(Valve lid) Service port
Flare nut
Gas line
piping
attached
to unit
Closed Opened Hexagonal
wrench
Ø 6.35
(1/4) 6.0±0.6
(4.4±0.4)
5.0±0.0
(3.7±0.4)
4 mm
(0.16 inch)
17.6±2.0
(13.0±1.5)
12.7±2
(9.4±1.5)
16±2
(12±1.5)
-
Ø 9.52
(3/8) 38±4 (28±3.0)
Ø 12.7
(1/2) 10.0±1.0 (7.4±0.7) 20.0±2.0 (14.8±1.5) 55±6 (41±4.4)
Ø 15.88
(5/8)
12.0±1.2
(8.9±0.9) 5 mm
(0.24 inch)
25.0±2.5
(18.4±1.8)
75±7
(55±5.1)
Ø 19.05
(3/4)
14.0±1.4
(10.3±1.0) 110±10 (81.1±7.4)
Ø 22.2
(7/8) 30.0±3.0
(22.1±2.2) 8 mm (0.31 inch) -
Ø 25.4
(1)
25±3
(18.5±2.2)
ENGLISH
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 1.5 m (4.92 ft) longer than the pipe length.
Preparation of Piping
Pipe
Reamer
Point down
Copper
tube 90° Slanted Uneven Rough
CAUTION
!
Pipe diameter
Inch (mm)
A inch (mm)
Wing nut type Clutch type
Ø 1/4 (Ø 6.35) 0.04~0.05(1.1~1.3)
0~0.02
(0~0.5)
Ø 3/8 (Ø 9.52) 0.06~0.07(1.5~1.7)
Ø 1/2 (Ø 12.7) 0.06~0.07(1.6~1.8)
Ø 5/8 (Ø 15.88) 0.06~0.07(1.6~1.8)
Ø 3/4 (Ø 19.05) 0.07~0.08(1.9~2.1)
• Always use a charge hose for service port connection.
•
After tightening the cap, check that no refrigerant leaks are present .
• When loosening a flare nut, always use two wrenches in
combination, When connecting the piping,
always use a spanner and torque wrench
in combination to tighten the flare nut.
• When connecting a flare nut, coat the
flare(inner and outer faces) with oil for
R32 and hand tighten the nut
3 to 4 turns as the initial tightening.

18
ENGLISH
Refrigerant piping on three principles
Drying Cleanliness Airtight
Should be no moisture
inside No dust inside. There is no refrigerant leakage
Items
Moisture
Dust
Leakage
Cause failure
- Significant
hydrolysis of
refrigerant oil
- Degradation of
refrigerant oil
- Poor insulation of
the compressor
- Do not cold and
warm
- Clogging of EEV,
Capillary
- Degradation of
refrigerant oil
- Poor insulation of
the compressor
- Do not cold and
warm
- Clogging of EEV,
Capillary
- Gas shortages
- Degradation of
refrigerant oil
- Poor insulation of
the compressor
- Do not cold and
warm
Countermeasure
- No moisture in the
pipe
- Until the connection
is completed, the
plumbing pipe
entrance should be
strictly controlled.
- Stop plumbing at
rainy day.
- Pipe entrance
should be taken side
or bottom.
-
When removal burr
after cutting pipe, pipe
entrance should be
taken down.
- Pipe entrance
should be fitted cap
when pass through
the walls.
- No dust in the pipe.
- Until the connection
is completed, the
plumbing pipe
entrance should be
strictly controlled.
- Pipe entrance
should be taken side
or bottom.
- When removal burr
after cutting pipe,
pipe entrance should
be taken down.
- Pipe entrance
should be fitted cap
when pass through
the walls.
- Airtightness test
should be.
- Brazing operations
to comply with
standards.
- Flare to comply with
standards.
- Flange connections
to comply with
standards.
Nitrogen substitution method
Welding, as when heating without nitrogen substitution a large
amount of the oxide film is formed on the internal piping.
The oxide film is a caused by clogging EEV, Capillary, oil hole of
accumulator and suction hole of oil pump in compressor.
It prevents normal operation of the compressor.
In order to avoid this problem, Welding should be done after replacing
air by nitrogen gas.
When welding plumbing pipe, the work is required.
Regulator
Nitrogen gas
Pressure 0.02 MPa
(2.9 psi) less
Auxiliary valve
Taping
(Should not
contain air)
Welding Point
Note) should not block the outlet side.
When the internal pressure in pipe is above
the atmospheric pressure, pinhole is
occurred and it is a leakage cause.
Oxide scale
Nitrogen
Plumbing materials and storage methods
Pipe must be able to obtain the specified thickness and should be
used with low impurities.
Also when handling storage, pipe must be careful to prevent a
fracture, deformity and wound.
Should not be mixed with contaminations such as dust, moisture.
Indoor unit Thermal insulator
(accessory)
Fastening band
(accessory)
Refrigerant piping
CAUTION
!
Insulation of shutoff valve
1Use the heat insulation material for the refrigerant piping which has
an excellent heat-resistance (over 120 °C [248 °F]).
2Precautions in high humidity circumstance:
This air conditioner has been tested according to the "ISO
Conditions with Mist" and confirmed that there is not any default.
However, if it is operated for a long time in high humid atmosphere
(dew point temperature: More than 23 °C [73.4 °F]), water drops
are liable to fall. In this case, add heat insulation material according
to the following procedure:
- Heat insulation material to be prepared:
EPDM (Ethylene Propylene Diene Methylene)-over 120 °C
[248 °F] the heat-resistance temperature.
- Add the insulation over 10 mm [0.39 inch] thickness at high
humidity environment.
• Always use the nitrogen.
(not use oxygen, carbon dioxide, and a Chevron gas)
Please use the following nitrogen pressure 0.02 MPa (2.9 psi)
- Oxygen: Promotes oxidative degradation of refrigerant oil.
Because it is flammable, it is strictly prohibited to use.
- Carbon dioxide: Degrade the drying characteristics of gas
- Chevron Gas: Toxic gas occurs when exposed to direct flame
•
Always use a pressure reducing valve.
• Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is observed.
In fact, due to the organic acids generated by oxidation of the
alcohol contained in the anti-oxidants, ants nest corrosion occurs.
(Causes of organic acid →alcohol + copper + water +
temperature)

19
ENGLISH
Service Port
No Use
(Weld with supplied
accessory pipe cap)
Liquid pipe
Gas pipe
WARNING
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas
leakage after the work.
!
CAUTION
!
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
6If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in
heating/cooling performance.
8A second branch cannot be made after a header.
(These are shown by .)
To Outdoor Unit
Sealed Piping
A
A
B
A
B
2Commercially available piping often contains dust and other
materials. Always blow it clean with a dry inert gas.
3Use care to prevent dust, water or other contaminants from entering
the piping during installation.
4Reduce the number of bending portions as much as possible, and
make bending radius as big as possible.
5Always use the branch piping set shown below, which are sold
separately.
Y branch Header
4 branches 7 branches 10 branches
ARBLB01621, ARBLB03321,
ARBLB07121, ARBLB14521,
ARBLB23220
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
Caution
1Use the following materials for refrigerant piping.
- Material: Seamless phosphorous deoxidized copper pipe
- Wall thickness : Comply with the relevant local and national
regulations for the designed pressure 3.8 MPa
(551 psi). We recommend the following table as
the minimum wall thickness.
Outer diameter
[mm(inch)]
6.35
(1/4)
9.52
(3/8)
12.7
(1/2)
15.88
(5/8)
19.05
(3/4)
22.2
(7/8)
25.4
(1)
Minimum thickness
[mm(inch)]
0.8
(0.03)
0.8
(0.03)
0.8
(0.03)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
Outer diameter
[mm(inch)]
28.58
(1-1/8)
31.8
(1-1/4)
34.9
(1-3/8)
38.1
(1-1/2)
41.3
(1-5/8)
44.45
(1-3/4)
53.98
(2-1/8)
Minimum thickness
[mm(inch)]
0.99
(0.04)
1.1
(0.04)
1.21
(0.05)
1.35
(0.05)
1.43
(0.06)
1.55
(0.06)
2.1
(0.08)
Precautions on Pipe connection / Valve operation
Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare
connection for the indoor unit, and welding connection for the outdoor
pipe and the branching parts.
- Use hexagonal wrench to open/close the valve.
hIn case of the heat pump system installation, be sure to maintain to
close no use pipe like below picture.
hRefer to the accessory installation manual provided.
For Heat Pump System Installation
REFRIGERANT PIPING
INSTALLATION

20
ENGLISH
Service Port
Low Pressure Gas pipe
Liquid pipe
High Pressure Gas pipe
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
WARNING
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas
leakage after the work.
!
Installation procedure for HR unit
1Using an insert-hole-in- anchor, hang the hanging bolt.
2Install a hexagon nut and a flat washer (locally-procured)to the
hanging bolt as shown in the figure in the bottom, and fit the main
unit to hang on the hanger metal.
3After checking with a level that the unit is level, tighten the hexagon
nut.
* The tilt of the unit should be within ±5° in front/back and left/right.
4This unit should be installed suspended from ceiling and side A
should always be facing up.
5Insulate not used pipes completely as shown in the figure.
Six-sided Nut
(M10 or M8)
Hanger metal
Hanger metal
Hanger metal
Flat washer
Flat washer
Flat washer
(M10)
Hanging bolt
(M10 or M8)
Insulation
Precautions on Pipe connection / Valve operation
Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare
connection for the indoor unit, and welding connection for the outdoor
pipe and the branching parts.
- Use hexagonal wrench to open/close the valve.
9The Multi V will stop due to an abnormality like excessive or
insufficient refrigerant. At such a time, always properly charge the
unit. When servicing, always check the notes concerning both the
piping length and the amount of additional refrigerant.
10 Never perform a pump down. This will not only damage the
compressor but also deteriorate the performance.
11 Never use refrigerant to perform an air purge. Always evacuate air
by using a vacuum pump.
12 Always insulate the piping properly. Insufficient insulation will
result in a decline in heating/cooling performance, drip of
condensate and other such problems.
13 When connecting the refrigerant piping, make sure the service
valves of the Outdoor Unit is completely closed (the factory
setting) and do not operate it until the refrigerant piping for the
Outdoor and Indoor Units has been connected, a refrigerant
leakage test has been performed and the evacuation process has
been completed.
14 Always use a non-oxidizing brazing material for brazing the parts
and do not use flux. If not, oxidized film can cause clogging or
damage to the compressor unit and flux can harm the copper
piping or refrigerant oil.
WARNING
When installing and moving the air conditioner to another site, be
sure to make recharge refrigerant after perfect evacuation.
• If a different refrigerant or air is mixed with the original
refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
• After selecting diameter of the refrigerant pipe to suit total
capacity of the indoor unit connected after branching, use an
appropriate branch pipe set according to the pipe diameter of the
indoor unit and the installation pipe drawing.
!
CAUTION
!
For Heat Recovery System Installation