LG ARUN260LLS5 INSTALLATION MANUAL

INSTALLATION MANUAL

AIR
CONDITIONER

www.lg.com

Copyright © 2018 - 2019 LG Electronics Inc. All Rights Reserved.

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.

Heat Pump
Or

iginal instruction

MFL71320401

Rev.00_020819

ENGLISH

ESPAÑOL

PORTUGUÊS

BAHASA INDONESIA

2

ENGLISH

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:

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

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.

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 intstall 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 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, harzards 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 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 :

3

• 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.

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 installting 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.

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.

• 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 outdoour 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.

• 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.

!

ENGLISH

4

ENGLISH

31 Auto Dust Removal Mode

31 Compressor Max. Frequency Limit

31 ODU Fan Max. RPM Limit

32 SLC (Smart Load Control)

32 Humidity Reference

32 Central Control Connection at Indoor Unit side

32 Compressor Input Current Limit

33 Power Consumption Display on wired remote controller

33 Overall Defrost Operating in Low temperature (Heating)

33 Base pan Heater operation

33 Comfort Cooling operation

34 Self-Diagnosis Function

37 CAUTION FOR REFRIGERANT LEAK

37 Introduction

37 Checking procedure of limiting concentration

38 INSTALLATION GUIDE AT THE SEASIDE

38 Model Designation

38 Airborne Noise Emission

2 TIPS FOR SAVING ENERGY
2 IMPORTANT SAFETY INSTRUCTIONS
5 INSTALLATION PROCESS
5 OUTDOOR UNITS INFORMATION
5 ALTERNATIVE REFRIGERANT R410A
6 SELECT THE BEST LOCATION
6 INSTALLATION SPACE

6 Individual Installation

7 LIFTING METHOD
8 INSTALLATION

8 The location of the Anchor bolts

8 Foundation for Installation

8 Preparation of Piping

10 Plumbing materials and storage methods

11 REFRIGERANT PIPING INSTALLATION

11 Precautions on Pipe connection / Valve operation

11 Connection of Outdoor units

11 Caution

12 PIPE CONNECTIONS BETWEEN INDOOR

AND OUTDOOR UNIT

12 Preparation Work

13 Pipe Drawing Out during Single / Series connection

13 Refrigerant piping system

14 Pipe Connection Method between outdoor unit/indoor unit

16 Branch pipe Fitting

18 Distribution Method

18 Vacuum Mode

18 Leak Test and Vacuum drying

19 Refrigerant charging

20 Thermal insulation of refrigerant piping

21 ELECTRICAL WIRING

21 Caution

23 Control box and connecting position of wiring

23 Communication and Power Cables

24 Wiring of main power supply and equipment capacity

24 Field Wiring

26 Checking the setting of outdoor units

27 Automatic Addressing

27 The Procedure of Automatic Addressing

28 Cool & Heat selector

29 High Static Pressure Compensation mode

29 Night Low Noise Function

29 Overall defrost mode

29 Setting the ODU address

30 Snow removal & rapid defrost

30 Setting Capacity Up Airflow Adjusting for IDU (Heating)

30 Target pressure adjusting

30 Low Ambient Kit

31 High Efficiency Mode (Cooling Operation)

TABLE OF CONTENTS

5

ENGLISH

ALTERNATIVE REFRIGERANT R410A

The refrigerant R410A has the property of higher operating pressure in
comparison with R22.
Therefore, all materials have the characteristics of higher resisting
pressure than R22 ones and this characteristic should also be
considered during the installation.
R410A is an azeotrope of R32 and R125 mixed at 50:50, so the ozone
depletion potential (ODP) of R410A is 0.

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).

• Since R410A is a mixed refrigerant, the required additional
refrigerant must be charged in its liquid state.(If the refrigerant
is charged in its gaseous state, its composition changes and the
system will not work properly.)

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
will be operated as low in the all indoor units.

Combination Ratio(50~200%)

Outdoor Number Connection Ratio

Single outdoor units 200 %

Double outdoor units 160 %

Triple outdoor units 130 %

Over the triple unit 130 %

CAUTION

!

• The wall thickness of the piping should comply with the relevant
local and national regulations for the designed pressure 3.8 MPa
[551.1psi]

• Since R410A is a mixed refrigerant, the required additional
refrigerant must be charged in its liquid state.
If the refrigerant is charged in its gaseous state, its composition
changes and the system will not work properly.

• 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.

• Be careful not to install wrongly to minimize economic loss
because it is expensive in comparison with R22.

OUTDOOR UNITS INFORMATION

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 24hours at 3.8MPa (38.7 kgf/cm

2

)[551.1psi]

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.

INSTALLATION PROCESS

6

ENGLISH

During the installation of the unit, consider service, inlet, and outlet
acquire the minimum space as shown in the figures below.
Side space should be more than 49 mm for operating of Auto Dust
Removal mode.

Limitati

ons 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’’)

Fron t

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 1 500 mm (59 inch) or less.

• The height of the wall on the inlet side must
be 500 mm (19-11/16’’) or less.

• There is no limit to the wall on Inlet side.

• If the height of the walls on the front and Inlet
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 (59 inch)

- h2 = B(Actual height) - 500 (19-11/16’’)

Individual Installation

INSTALLATION SPACE

Category

Installation Space

Case 1

(10mm(13/32inch)≤Side

Space≤49mm(13/14inch))

Case 2

(Side Space

≥49mm(13/14inch))

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≥1200 (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≥10 (13/32)
B≥300 (11-13/16)
E≥20 (25/32)

ac

b

d

aee c

b

d

aec

b

f

d

aec

b

f

d

ac

b

f

d

aec

b

f

d

aeec

b

f

d

a

b

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

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.)

7

ENGLISH

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.

• Install the outdoor unit at the higher installation console by 50 cm
(19.7 inch) than the average snowfall (annual average snowfall) if it is
installed at the area with much snowfall.

• Where snow accumulated on the upper part of the Outdoor Unit by
more than 10 cm (3.9 inch), always remove snow for operation.

- The height of H frame must be more than 2 times the snowfall
and its width shall not exceed the width of the product. (If width
of the frame is wider than that of the product, snow may
accumulate)

- 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.

LIFTING METHOD

CAUTION

!

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.

Remove the Rear Grille

• Remove the rear grille in snowy area.

• Make sure that heat exchanger should not be damaged.

Locking points for

transportation ropes

Forklift Carrying Hole

UXA UXB

Rear Grille

Forklift Carrying Guide

8

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).

Chassis A [mm (inch)] B [mm (inch)]

UXA 930 (36-5/8) 730 (28-3/4)
UXB 1 240 (47-1/4) 1 040 (40-15/16)

• 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)

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

CAUTION

!

• 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.

Pallet(Wood Support)

- Remove before Installation

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

Foundation for Installation

The location of the Anchor bolts

INSTALLATION

Outdoor units
should not be
supported only by
the corner supports.

65

(2-9/16)

65

(2-9/16)

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

65 (2-9/16)

At least

65 (2-9/16)

Unit : mm (inch)

731 (28-25/32)

At least 100 mm

(3-15/16 inch)

Center of the Unit

At least 100 mm

(3-15/16 inch)

Center of the Unit

760 (29-29/32)

9

ENGLISH

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.

1 Remove the cap and turn the valve counter clockwise with the

hexagon wrench.

2 Turn 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.

3 Make 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)

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)

CAUTION

!

• 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
R410A(PVE) and hand tighten the nut
3 to 4 turns as the initial tightening.

Union

Insulation of shutoff valve

1

Use the heat insulation material for the refrigerant piping which has
an excellent heat-resistance (over 120 °C [248 °F]).

2 Precautions 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.

Closing shutoff valve

1 Remove the cap and turn the valve clockwise with the hexagon

wrench.

2 Securely tighten the valve until the shaft contacts the main body seal.

3 Make 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)

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.

Pipe diameter

Inch (mm)

A inch (mm)

Wing nut type Clutch type

Ø 1/4 (Ø 6.35)

0.04~0.07 (1.1~1.8) 0~0.02 (0~0.5)

Ø 3/8 (Ø 9.52)
Ø 1/2 (Ø 12.7)

Ø 5/8 (Ø 15.88)

<Wing nut type> <Clutch type>

Bar

"A"

Copper pipe

±2

90°

45°

±2

A

R=0.4~0.8

Fastening band
(accessory)

Refrigerant piping

Indoor unit

Thermal insulator
(accessory)

10

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 insula’tion 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

Counter

measure

-

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.

• 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)

CAUTION

!

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 abo
ve 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.

11

ENGLISH

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.)

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.

A≥B≥C≥D

① IDU side connection pipe
② ODU to ODU connection pipe (1st branch)
③ ODU to ODU connection pipe (2st branch)
④ ODU to ODU connection pipe (3rd brach)

2 Unit

3 Unit

4 Unit

ARCNN21

ARCNN31

ARCNN41

C

C

A

Outdoor units Model

Liquid Pipe Gas Pipe

I.D.15.88 I.D.15.88

I.D.15.88

I.D.19.05

I.D.12.7

I.D.12.7

I.D.9.52

331

83

70

314

I.D.22.2

O.D.19.05

O.D.12.7

I.D.9.52

334
281

I.D.15.88

I.D.19.05

I.D.19.05

I.D.12.7

83

I.D.22.2

334
281

I.D.15.88

I.D.19.05

I.D.19.05

I.D.12.7

83

I.D.22.2

C

C

I.D.28.58I.D.22.2O.D.19.05

O.D.22.2I.D.28.58I.D.31.8

I.D. 19.05O.D.15.88

I.D. 19.05O.D.15.88

I.D.22.2O.D.19.05

I.D.19.05O.D.15.88

I.D.19.05O.D.15.88

I.D.12.7

I.D.15.88

O.D.19.05

C

C

C

I.D.28.58

O.D.22.2

125

I.D.41.3

O.D.34.9

111

130

416
408

I.D.28.58 I.D.28.58

I.D.34.9

I.D.41.3 I.D.38.1

O.D.34.9

I.D.31.8

I.D.22.2

I.D.28.58

341

111

298

I.D.34.9

I.D.41.3

I.D.28.58

134

415
375

I.D.44.48 I.D.53.98

I.D.41.3

I.D.28.58

I.D.34.9O.D. 28.58I.D.22.2

I.D.34.9O.D.28.58I.D.22.2

I.D.34.9O.D.28.58I.D.22.2

I.D.53.98I.D.44.5O.D.41.3

I.D.34.9O.D.28.58I.D.22.2

O.D.41.3I.D. 44.5I.D.53.98

O.D.34.9

I.D.28.58

2, 3, 4 Outdoor Units

For more information, refer accessory installation manual.

Y branch

A

B

To outdoor unit
To branch piping or indoor unit

A
B

Viewed from point A
in direction of arrow

Within +/- 10

2 Commercially available piping often contains dust and other

materials. Always blow it clean with a dry inert gas.

3 Use care to prevent dust, water or other contaminants from entering

the piping during installation.

4 Reduce the number of bending portions as much as possible, and

make bending radius as big as possible.

5 Always use the branch piping set shown below, which are sold

separately.

Caution

1 Use 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)

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)]

0.8

(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)

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)

Y branch

Header

4 branches 7 branches 10 branches

ARBLB01621, ARBLB03321,
ARBLB07121, ARBLB14521,

ARBLB23220

ARBL054 ARBL057 ARBL1010

ARBL104 ARBL107 ARBL2010

Connection of Outdoor units

When installing ODU series, refer below picture.

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.

REFRIGERANT PIPING
INSTALLATION

Service Port

Liquid pipe

Gas pipe

AB

(Master)

(Slave1)

C

(Slave2)

(Slave3)

D

12

ENGLISH

6 If 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.

7 Always 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.

8 A second branch cannot be made after a header.

(These are shown by .)

To Outdoor Unit

Sealed Piping

A

A
B

9 The 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.

A

B

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.

- Pipe connections can be done on the front side or on the side
according to the installation environments.

- Be sure to let 0.2 kgf/cm

2

(2.8 psi) Nitrogen flow in the pipe when

welding.

- If Nitrogen was not flown during welding, many oxidized membranes
may form inside the pipe and disturb the normal operations of valves
and condensers.

Nitrogen
Direction

Removal area for pipes

bottom side connections.

Knock Out for

communication cable

Knock Out for
power supply cable

Knock Out for
gas pipe

Knock Out for

Liquid pipe

CAUTION

!

• Do not give damage to the pipe/base during the Knock Out
work.

• Proceed to pipe work after removing burr after Knock Out work.

• Perform sleeve work to prevent damage to the wire when
connecting wires using Knock Outs.

Preparation Work

- Use Knock Outs of Base Pan of the outdoor unit for Left/Right or
Bottom pipe drawing outs.

PIPE CONNECTIONS BETWEEN
INDOOR AND OUTDOOR UNIT

Regulator

Valve

Nitrogen

Left Side

Pipe Draw

Out

Right
Side Pipe
Draw Out

Front Pipe Draw Out

Refrigerant Pipe

Nitrogen

Nitrogen
Direction

Direction

Taping

13

ENGLISH

Remove leakage prevention cap

• Remove the leakage prevention cap attached to the outdoor unit
service valve before pipe work.

• Proceed the leakage prevention cap removal as follows:

- Verify whether all the pipes are locked.

- Extract remaining refrigerant or air inside using the service port.

- Remove the leakage prevention cap

Method of drawing out pipes on the bottom side

- Drawing out common pipe through side panel

Combination of Y
branch/header Method

Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping

h * : See Table 4

Header Method

Ⓐ : Outdoor Unit
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : Header

Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch

pipe between Outdoor
units: ARCNN41

Ⓕ : Connection branch

pipe between Outdoor
units : ARCNN31

Ⓖ : Connection branch

pipe between Outdoor
units : ARCNN21

Y branch method

h * : See Table 4

Series Outdoor Units (2 Units ~ 4 Units)

Combination of Y branch/
header Method

Ⓐ : Outdoor Unit
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe

between Outdoor
units : ARCNN41

Ⓕ : Connection branch pipe

between Outdoor
units : ARCNN31

Ⓖ : Connection branch pipe

between Outdoor
units : ARCNN21

Ⓗ : Header
Ⓘ : Sealed piping

h * : See Table 4

Y branch method

Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units

h * : See Table 4

Refrigerant piping system
1 Outdoor Units

Pipe Drawing Out during Single / Series connection

Method of drawing out pipes on the front side

- Proceed with the pipe work as shown in the below figure for front

side pipe drawing out.

Service Port

Liquid pipe

Gas pipe

Leakage
Prevention Cap

H 110 m [361 ft]

H 110 m [361 ft]

L 150 m [492 ft] (200 m [656 ft])

l 40 m [131 ft] (90m [295 ft])

h 40 m [131 ft]

L 150 m [492 ft] (200 m [656 ft])

l 40 m [131 ft] (90m [295 ft])

Indoor
Unit

h 40m(131ft)

Liquid pipe

Liquid pipe

Gas pipe

Gas pipe

H 110 m [361 ft]

h 40 m [131 ft]

L 200 m [656 ft]

l 40 m [131 ft]

D

Slave3

Slave2

10m or

less

G

F

E

H 110 m [361 ft]

Slave1

Master

C

h 40 m (131 ft)

ODU Capacity
Master ≥ Slave 1 ≥Slave 2 ≥Slave 3

L 150 m [492 ft] (200 m [656 ft])

l 40 m [131 ft] (90m [295 ft])

C

C

C

Indoor

Unit

C

Liquid pipe

Remove Knock Out for the pipes

Gas pipe

Slave3

Slave2

10m or

less

G

F

E

H 110 m [361 ft]

Slave1

Master

ODU Capacity
Master ≥ Slave 1 ≥Slave 2 ≥Slave 3

L 150 m [492 ft] (200 m [656 ft])

40 m [131 ft] (90m [295 ft]

l

H

I

h 40 m (131 ft)

14

ENGLISH

Header Method

Ⓐ : Outdoor Unit
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : Connection branch pipe

between Outdoor
units : ARCNN41

Ⓕ : Connection branch pipe

between Outdoor
units : ARCNN31

Ⓖ : Connection branch pipe

between Outdoor
units : ARCNN21

Pipe Connection Method between outdoor
unit/indoor unit

h See Table 2
A : Refrigerant pipe diameter from outdoor unit to first branch
E : Refrigerant pipe diameter for outdoor unit capacity

(Slave 1+ Slave 2+ Slave 3)

F : Refrigerant pipe diameter for outdoor unit capacity

(Slave 2+ Slave 3)

G : Refrigerant pipe diameter for outdoor unit capacity(Slave 3)

Level Difference

(Outdoor unit ↔ Outdoor unit)

5 m [16.4 ft]

Max length from first branch to

each outdoor unit (L1, L2, L3)

Less than 10 m [32.8 ft]

(equivalent length of piping 13 m

[42.7 ft])

h * : See Table 4

WARNING

!

Increased Pipe Diameter(table 2)

- When pipe length is 90m [295 ft] or more from ODU to 1st
branch

- When level difference is 50 m [164 ft] or more

WARNING

!

• Branch pipe can not be used after header.

• It is recommended that difference in length of the pipes
connected to the indoor units (a~f) is minimized. Performance
difference between indoor units may occur.

Y branch

Method

Combination of Y

branch/header

Method

Header

Method

Max pipe

length

Outdoor Unit

↔

Indoor Unit

Longest

pipe

length(L)

A+B+C+D+e ≤ 150 m

[492 ft]

(200 m [656 ft] :

Conditional application)*

A+B+b ≤ 150 m [492 ft]
A+C+e ≤ 150 m [492 ft]

(200 m [656 ft] :

Conditional application)*

A+f ≤ 200 m

[656 ft]

Equivalent

pipe length

175 m [574 ft]

(225 m [738 ft] :

Conditional application)*

175 m [574 ft]

(225 m [738 ft] :

Conditional application)*

225 m

[738 ft]

Total pipe

length

1000 m [3281 ft] 1000 m [3281 ft]

1000 m

[3281 ft]

Max

difference

in height

Outdoor Unit

↔ Indoor Unit

Difference in

height(H)

110 m [361 ft] 110 m [361 ft] 110 m [361 ft]

Indoor Unit

↔ Indoor Unit

Difference in

height(h)

40 m [131 ft] 40 m [131 ft] 40 m [131 ft]

Longest pipe

length after

1st branch

Pipe

length(ℓ)

40 m [131 ft]

(90 m [295 ft] :

Conditional application)*

40 m [131 ft]

(90 m [295 ft] :

Conditional application)*

40 m [131 ft]

(Table 1) Limit Pipe length

(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)

ODU

capacity

(hp)

Pipe diameter when pipe

length is < 90 m (295 ft)

(Standard)

Pipe diameter when pipe
length is ≥ 90 m (295 ft)

Pipe diameter when height

differential (ODU↔IDU) is

> 50 m (164 ft)

Liquid Pipe

mm (inch)

Gas Pipe

mm (inch)

Liquid Pipe

mm (inch)

Gas Pipe

mm (inch)

Liquid Pipe

mm (inch)

Gas Pipe

mm (inch)

8

Ø 9.52 (3/8) Ø 19.05 (3/4) Ø 12.7 (1/2) Ø 22.2 (7/8) Ø 12.7 (1/2) Not increased

10

Ø 9.52 (3/8) Ø 22.2 (7/8) Ø 12.7 (1/2)

Ø 28.58 (1-1/8)

Ø 12.7 (1/2) Not increased

12~16

Ø 12.7 (1/2)

Ø 28.58 (1-1/8)

Ø 15.88 (5/8)

Ø 34.9 (1-3/8)

Ø 15.88 (5/8) Not increased

18~22

Ø 15.88 (5/8)

Ø 28.58 (1-1/8)

Ø 19.05 (3/4)

Ø 34.9 (1-3/8)

Ø 19.05 (3/4) Not increased

24

Ø 15.88 (5/8)

Ø 34.9 (1-3/8)

Ø 19.05 (3/4)

Ø 41.3 (1-5/8)

Ø 19.05 (3/4) Not increased

26~34

Ø 19.05 (3/4)

Ø 34.9 (1-3/8)

Ø 22.2 (7/8)

Ø 41.3 (1-5/8)

Ø 22.2 (7/8) Not increased

36~60

Ø 19.05 (3/4)

Ø 41.3 (1-5/8)

Ø 22.2 (7/8)

Ø 44.5 (1-3/4)

Ø 22.2 (7/8) Not increased

62~64

Ø 22.2 (7/8)

Ø 44.5 (1-3/4)

Ø 25.4 (1)

Ø 53.98 (2-1/8)

Ø 25.4 (1) Not increased

66~104

Ø 22.2 (7/8)

Ø 53.98 (2-1/8)

Ø 25.4 (1)

Ø 53.98 (2-1/8)

Ø 25.4 (1) Not increased

(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)

Downward indoor unit

total capacity [kW(Btu/h)]

Liquid pipe
[mm(inch)]

Gas pipe

[mm(inch)]

≤ 5.6(19 100)

Ø 6.35(1/4) Ø 12.7(1/2)

< 16.0 (54 600) Ø 9.52(3/8) Ø 15.88(5/8)

≤ 22.4 (76 400)

Ø 9.52(3/8) Ø 19.05(3/4)
< 33.6 (114 700) Ø 9.52(3/8) Ø 22.2(7/8)
< 50.4 (172 000) Ø 12.7(1/2) Ø 28.58(1-1/8)
< 67.2 (229 400) Ø 15.88(5/8) Ø 28.58(1-1/8)

< 72.8(248 500) Ø 15.88(5/8) Ø 34.9(1-3/8)
< 100.8(344 000) Ø 19.05(3/4) Ø 34.9(1-3/8)
< 173.6(592 500) Ø 19.05(3/4) Ø 41.3(1-5/8)
< 184.8(630 700) Ø 22.2(7/8) Ø 44.5(1-3/4)

≤ 224.0(764 400)

Ø 22.2(7/8) Ø 53.98(2-1/8)

(Table 4) Conditional Application

Condition Example

1

Diameter of pipes between
first branch and the last
branch should be increased
by one step, except pipe
diameter B,C,D is same as
Diameter A

40 m [131 ft] <

B+C+D+e

90 m [295 ft] ’B, C, D

Change a diameter

2

While calculating whole
refrigerant pipe length, pipe
B,C,D length should be
calculated twice.

A+Bx2+Cx2+Dx2

+a+b+c+d+e

≤

1 000 m [3 281 ft]

3

Length of pipe from each
indoor unit to the closest
branch

a,b,c,d,e≤40 m

[131 ft]

4

Length of pipe from
outdoor unit to the
farthest indoor unit 5
(A+B+C+D+e)] - [Length
of pipe outdoor unit to the
closest indoor unit 1
(A+a)] ≤40 m [131 ft]

(A+B+C+D+e)-

(A+a) ≤ 40 m

[131 ft]

• To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.

Ø 6.35(1/4) ’ Ø 9.52(3/8), Ø 9.52(3/8) ’
Ø 12.7(1/2), Ø 12.7(1/2) ’ Ø 15.88(5/8),
Ø 15.88(5/8) ’ Ø 19.05(3/4), Ø 19.05(3/4) ’
Ø 22.2(7/8), Ø 22.2(7/8) ’ Ø 25.4(1),
Ø 25.4(1) ’ Ø 28.58(1-1/8), Ø 28.58(1-1/8) ’
Ø 31.8(1-1/4), Ø 31.8(1-1/4) ’ Ø 34.9(1-3/8),
Ø 34.9(1-3/8) ’ Ø 38.1(1-1/2)

Master

L2

L3

Indoor

Unit

E GF

1st branch

l 40m (131ft)

Slave3

Slave2

Slave1

10m or

less

G

Slave1

H1

L1

Refrigerant pipe diameter from outdoor unit to first branch

Master

F

E

B

H 110 m [361 ft]

C

h 40 m (131 ft)

Slave2

C

ODU Capacity
Master ≥ Slave 1 ≥Slave 2 ≥Slave 3

L 200 m [656 ft]

l

40 m [131 ft]

D

CCC

C

Slave3

h 40 m (131 ft)

L

l

H 110 m [361 ft]

h 40 m [131 ft]

Indoor
Unit

15

ENGLISH

Indoor Unit Connection

Indoor Unit connecting pipe from branch (a,b,c,d,e,f)

Indoor Unit capacity

[kW(Btu/h)]

Liquid pipe

[mm(inch)]

Gas pipe [mm(inch)]

≤ 5.6(19 100)

Ø 6.35(1/4) Ø 12.7(1/2)
< 16.0(54 600) Ø 9.52(3/8) Ø 15.88(5/8)
< 22.4(76 400) Ø 9.52(3/8) Ø 19.05(3/4)
< 28.0(95 900) Ø 9.52(3/8) Ø 22.2(7/8)

WARNING

!

• In case of pipe diameter B connected after first branch is bigger
than the main pipe diameter A, B should be of the same size
with A.

Ex) In case indoor unit combination ratio 120 % is connected to

24 HP(67.2 kW) outdoor unit.

1) Outdoor unit main pipe diameter A : Ø 34.9(1-3/8)(Gas
pipe), Ø15.88(5/8)(liquid pipe)

2) Pipe diameter B after first branch according to 120 %
indoor unit combination(80.6 kW) : Ø 34.9(1-3/8)(gas pipe),
Ø 19.05(3/4)(liquid pipe)

Therefore, pipe diameter B connected after first branch
would be Ø 34.9(1-3/8)(gas pipe) / Ø 15.88(5/8)(liquid pipe)
which is same with main pipe diameter.

Pipe Connection Method/Precautions for
Series connections between Outdoor units

- Separate Y branch joints are needed for series connections between
outdoor units.

- Please refer to the below connection examples to install pipe
connections between outdoor units.

Pipe connection between outdoor
units (General Case)

The maximum pipe
length after the first
branching between the
outdoor units is 10 m
[32.8 ft] or less

Pipes between outdoor units
are 2 m [6.6 ft] or less

2 m [6.6 ft] or less

- If the distance between the outdoor units becomes more than 2 m
[6.6 ft], apply Oil Traps between the gas pipes.

- If the outdoor unit is located lower than the main pipe, apply Oil Trap.

Pipes between outdoor units
are 2 m [6.6 ft] or longer

Oil Trap

Oil Trap Oil Trap

2 m [6.6 ft] or less

2 m [6.6 ft] or less 2 m [6.6 ft] or less

0.2 m [0.66 ft]

2 m [6.6 ft] or longer

2 m [6.6 ft] or longer

2 m [6.6 ft] or longer

CAUTION

!

• Bending radius should be
at least twice the diameter
of the pipe.

• Bend pipe after 500 mm
[19.7 inch] or more from
branch(or header).
Do not bend U type.
It may affect performance
or result in noise. If U type
bending is required, the R
should be more than 200
mm [7.9 inch]

Toward indoor unit

Toward indoor unit

Pipe inclination (2° or more)

Toward indoor unit

Toward indoor unit

Toward indoor unit

Toward indoor unit

(Example 1)

(Example 2)

(Example 3)

- Apply Oil Trap as shown below when the length of the pipe between
the outdoor units is more than 2 m [6.6 ft]. Otherwise, the unit may
not operate properly.

(Example 1)

Toward indoor unit

≤ 2m

Examples of Wrong Pipe Connections

If the main pipe is
higher than the
outdoor units, oil is
accumulated in the
outdoor unit.

Oil Trap

500 mm [19.7 inch]

or more

500 mm [19.7 inch]

or more

R

If there are differences in the height
between the outdoor units, oil is
accumulated in the lower outdoor unit.

16

ENGLISH

Toward indoor unit

≤ 2 m [6.6 ft]

≥ 2 m [6.6 ft]

≥ 0.2 m [0.66 ft]

Oil Trap

(Example 2)

- When connecting the pipes between the outdoor units, the
accumulation of oil in the slave outdoor unit should be avoided.
Otherwise, the unit may not operate properly.

(Example 1)

Toward indoor unit

Toward indoor unit

h

h

≥ 0.2 m [0.66 ft]

Toward indoor unit

Toward indoor unit

Oil Trap

(Example 3)

h

Toward indoor unit

(Example 2)

Y branch

A

B

Viewed from point A
in direction of arrow

Horizontal
plane

Within +/- 10°

A

Ⓐ To Outdoor Unit
Ⓑ To Branch Piping or Indoor Unit

• Ensure that the branch pipes are attached horizontally (see the
diagram below.)

• There is no limitation on the joint mounting configuration.

• If the diameter of the refrigerant piping selected by the procedures
described is different from the size of the joint, the connecting
section should be cut with a pipe cutter.

• Branch pipe should be insulated with the insulator in each kit.

Branch pipe Fitting

• When the number of indoor units to be connected to the branch
pipes is less than the number of branch pipes available for
connection then cap pipes should be fitted to the surplus branches.

Header

A

B

Ⓐ To Outdoor Unit
Ⓑ To Indoor Unit

• The indoor unit having larger
capacity must be installed closer
to Ⓐ than smaller one.

• If the diameter of the refrigerant
piping selected by the
procedures described is
different from the size of the
joint, the connecting section
should be cut with a pipe cutter.

ⓒ Pipe cutter

• When the number of pipes to be
connected is smaller than the
number of header branches,
install a cap to the unconnected
branches.

• Fit branch pipe lie in a horizontal plane.

Horizontal plane

View from point B in the direction of the arrow

Tape
(field supply)

Insulator

(included with kit)

Liquid and gas
pipe joints

Insulator for
field piping

C

B

Pinched pipe

17

ENGLISH

• Header should be insulated with the insulator in each kit.

• Joints between branch and pipe should be sealed with the tape
included in each kit.

• Any cap pipe should be insulated using the insulator provided with
each kit and then taped as described above.

Y branch pipe

Models Gas pipe Liquid pipe

ARBLN01621

I.D.19.05(3/4)

O.D.15.88(5/8)

I.D.12.7(1/2)

I.D.15.88(5/8)

I.D.15.88(5/8)

I.D.15.88(5/8)

I.D.12.7(1/2)

I.D.12.7(1/2)

292(11-1/2)

281(11-1/16)

74

(2-29/32)

70(2-3/4)

1

1

I.D.12.7(1/2)

292(11-1/2)

281(11-1/16)

74

(2-29/32)

70(2-3/4)

I.D.6.35(1/4)

I.D.6.35(1/4)

I.D.6.35(1/4)

1

1

I.D.9.52(3/8)

I.D.9.52(3/8)

I.D.9.52(3/8)

O.D.9.52(3/8)

ARBLN03321

413(16-1/4)

390(15-11/32)

I.D.19.05(3/4)

I.D.19.05(3/4)

I.D.19.05(3/4)

I.D.12.7(1/2)

I.D.12.7

(1/2)

70(2-3/4)

I.D.15.88(5/8)

I.D.15.88(5/8)

I.D.25.4(1)

I.D.25.4(1)

O.D.25.4(1)

80(3-5/32)

110(4-11/32)

83

(3-9/32)

1

2

3

3

O.D.19.05(3/4)

O.D.19.05(3/4)

1 2

I.D.22.2(7/8)

I.D.22.2(7/8)

I.D.22.2(7/8)

I.D.28.58(1-1/8)

I.D.6.35(1/4)

I.D.12.7(1/2)

I.D.12.7(1/2)

I.D.12.7(1/2)

74

(2-29/32)

332(13-1/16)

321(12-5/8)

I.D.6.35(1/4)

I.D.9.52(3/8)

I.D.9.52(3/8)

I.D.9.52(3/8)

I.D.6.35(1/4)I.D.6.35(1/4)

ARBLN07121

I.D.12.7

(1/2)

376(14-13/16)

404(15-29/32)

120(4-23/32) 120(4-23/32)

90(3-17/32)

I.D.15.88(5/8)

I.D.15.88(5/8)

2

3

1

2

1 3

I.D.19.05(3/4)

I.D.19.05(3/4)

O.D.19.05(3/4)

96

(3-25/32)

I.D.22.2(7/8)

I.D.22.2(7/8)

O.D.22.2(7/8)

I.D.34.9(1-3/8)

I.D.28.58(1-1/8)

I.D.28.58(1-1/8)

I.D.28.58(1-1/8)

O.D.31.8(1-1/4)

I.D.31.8(1-1/4)

I.D.31.8(1-1/4)

I.D.6.35(1/4)

I.D.15.88(5/8)

I.D.15.88(5/8)

I.D.15.88(5/8)

I.D.12.7(1/2)

I.D.12.7(1/2)

I.D.12.7(1/2)

O.D.12.7(1/2)

O.D.12.7(1/2)

70(2-3/4)

110(4-11/32)

371(14-19/32)

394(15-1/2)

83

(3-9/32)

2

3

3

I.D.19.05(3/4)

I.D.19.05(3/4)

I.D.19.05(3/4)

2

I.D.6.35(1/4)

I.D.9.52(3/8)

I.D.9.52(3/8)

I.D.6.35(1/4)

ARBLN14521

I.D.12.7(1/2)

70(2-3/4)

471(18-17/32)

517(20-11/32)

125

(4-29/32)

130(5-1/8)

I.D.15.88(5/8)

I.D.41.3(1-5/8)

I.D.41.3
(1-5/8)

I.D.41.3(1-5/8)

I.D.38.1(1-1/2)

I.D.38.1(1-1/2)

I.D.38.1(1-1/2)

O.D.38.1(1-1/2)

O.D.15.88(5/8)

2

3

3

2

2

3

3

120(4-23/32)

120(4-23/32)

90(3-17/32)

I.D.19.05(3/4)

I.D.19.05(3/4)

I.D.22.2(7/8)

I.D.22.2(7/8)

O.D.22.2(7/8)

I.D.34.9(1-3/8)

I.D.34.9(1-3/8)

I.D.34.9(1-3/8)

O.D.34.9(1-3/8)

I.D.28.58(1-1/8)

O.D.28.58(1-1/8)

I.D.28.58(1-1/8)

I.D.6.35(1/4)

I.D.12.7(1/2)

O.D.12.7(1/2)

I.D.12.7

(1/2)

110(4-11/32)110(4-11/32)

416(16-3/8)

444(17-15/32)

O.D.15.88(5/8)

I.D.15.88(5/8)

I.D.19.05(3/4)

I.D.15.88(5/8)

I.D.15.88(5/8)

I.D.19.05(3/4)

I.D.19.05(3/4)

O.D.19.05(3/4)

80(3-5/32)

2

3

1

2 3 3

96

(3-25/32)

I.D.22.2(7/8)

I.D.22.2(7/8)

I.D.22.2(7/8)

I.D.6.35(1/4)

I.D.9.52(3/8)

I.D.9.52(3/8)

I.D.6.35(1/4)

ARBLN23220

O.D.28.58(1-1/8)

I.D.22.2(7/8)

115(4-17/32)

X2

100(4-11/32)

O.D.15.88(5/8)

I.D.12.7(1/2)

70(2-3/4)

O.D.22.2(7/8)

I.D.15.88(5/8)

I.D.19.05(3/4)

120(4-23/32)

O.D.38.1(1-1/2)

I.D.34.9(1-3/8)

I.D.28.58(1-1/8)

O.D.44.48(1-3/4)

X2

175(6-7/8)

I.D.31.8(1-1/4)

I.D.53.98(2-1/4)

I.D.25.4(1)

I.D.44.48(1-3/4)

I.D.44.48(1-3/4)

I.D.38.1(1-1/2)I.D.41.3(1-5/8)

I.D.44.48(1-3/4)

I.D.38.1(1-1/2)

I.D.41.3(1-5/8)

I.D.53.98(2-1/4)

420(16-17/32)

490(19-9/32)

134

1

2

3

32

3 3

3

3

2

I.D.6.35(1/4)

O.D.19.05(3/4)

O.D.12.7(1/2)

I.D.15.88(5/8)

O.D.12.7(1/2) I.D.6.35(1/4)

I.D.9.52(3/8)

X2

110(4-11/32) 110(4-11/32)

I.D.25.4(1)

I.D.22.2(7/8)

I.D.19.05(3/4)

I.D.19.05(3/4)I.D.22.2(7/8)

I.D.25.4(1)

I.D.25.4(1)

I.D.22.2(7/8)

346(13-5/8)

379(14-29/32)

96(3-25/32)

2

3 32

3

I.D.6.35(1/4)

[Unit:mm(inch)]

[Unit:mm(inch)]

Header

Models Gas pipe Liquid pipe

4 branch

ARBL054

120

150

360

120

ID15.88

ID12.7

ID12.7

ID15.88

ID15.88

ID19.05

120(4-23/32)

360(14-5/32)

ID9.52(3/8)ID9.52(3/8)ID9.52(3/8)

ID9.52(3/8)

ID6.35(1/4)

ID6.35(1/4)

ID9.52(3/8)

ID12.7(1/2)

150
(5-29/32)

120
(4-23/32)

7 branch

ARBL057

540

120

150

120

ID15.88

ID12.7

ID15.88

ID12.7

ID15.88

ID19.05

540(21-1/4)

ID9.52(3/8)

150
(5-29/32)

120
(4-23/32)

120(4-23/32)

ID6.35(1/4)

ID9.52(3/8)

ID9.52(3/8)

ID12.7(1/2)

4 branch

ARBL104

120

150

400

160

ID15.88

ID12.7

ID19.05

ID15.88

ID22.2

ID28.58ID25.4

ID9.52(3/8)

150
(5-29/32)

120(4-23/32)

120
(4-23/32)

360(14-5/32)

ID9.52(3/8)ID9.52(3/8)ID9.52(3/8)

ID9.52(3/8)

ID6.35(1/4)

ID6.35(1/4)

ID9.52(3/8)

ID12.7(1/2)

7 branch

ARBL107

120

150

160

580

ID19.05

ID15.88

ID15.88

ID12.7

ID22.2ID28.58 ID25.4

ID9.52(3/8)

120
(4-23/32)

700(27-9/16)

120(4-23/32)

ID6.35(1/4)

ID9.52(3/8)

ID9.52(3/8)ID9.52(3/8)

ID6.35(1/4)ID6.35(1/4)

ID9.52(3/8)

ID6.35(1/4)

ID9.52(3/8)ID12.7(1/2)

150
(5-29/32)

ID9.52(3/8)

10 branch

ARBL1010

120

150

160

760

ID19.05

ID15.88

ID15.88

ID12.7

ID22.2ID28.58 ID25.4

ID9.52(3/8)

120
(4-23/32)

120(4-23/32)

720(28-11/32)

ID6.35(1/4)

ID9.52(3/8)

ID9.52ID9.52
(3/8)(3/8)

ID9.52
(3/8)

ID6.35(1/4)

ID12.7(1/2)

ID9.52(3/8)

150
(5-29/32)

ID9.52(3/8)

10 branch

ARBL2010

120

150

182

775

ID19.05

ID15.88

ID15.88

ID12.7

ID28.58

ID31.8 ID34.9

ID9.52(3/8)

120
(4-23/32)

ID9.52(3/8)

ID6.35(1/4)

ID9.52
(3/8)

107(4-7/32)

60*9=540(21-1/2)

700(27-9/16)

ID6.35(1/4)

ID9.52(3/8)

ID19.05(3/4)

ID15.88(5/8)

ID9.52
(3/8)

ID6.35
(1/4)

ID9.52
(3/8)

ID6.35
(1/4)

150
(5-29/32)

ID9.52(3/8)

Insulate the header using
the insulation
material attached to the
branch pipe kit
as shown in the figure.

Tape

Insulator

Insulator of field pipe

Insulator for cap pipe

Cap pipe

Tape

18

ENGLISH

- Ensure that the branch pipes are attached vertically.

Slave

Master

Header

Slave

Master

Slave

Master

Slave

Master

Vertical Distribution

The others

Leak test
Leak test should be made by pressurizing nitrogen gas to 3.8 MPa(38.7

kgf/cm

2

). If the pressure does not drop for 24 hours, the system
passes the test. If the pressure drops, check where the nitrogen leaks.
For the test method, refer to the following figure. (Make a test with
the service valves closed. Be also sure to pressurize liquid pipe, gas
pipe and high pressure gas pipe)

The test result can be judged good if the pressure has not be reduced
after leaving for about one day after completion of nitrogen gas
pressurization.

Leak Test and Vacuum drying

Indoor unit

Nitrogen gas
cylinder

Slave 1 outdoor unit Master outdoor unit

Liquide pipe

Gas pipe

Liquide pipe

Gas pipe

Liquid side

Gas side

Close

Close

Close

Close

When inserting nitrogen
gas of high pressure, it
must be used with
regulator.

This function is used for creating vacuum in the system after
compressor replacement, ODU parts replacement or IDU
addition/replacement.

Vacuum mode setting method

SW01C (Ɨ: Confirm /
Automatic Addressing)

SW02C (ȭ: backward)

SW04C (X : cancel)

DIP-SW01

7-Segment

SW01D (reset)

SW03C (ȯ: forward)

Vacuum mode off method

CAUTION

!

ODU operation stops during vacuum mode. Compressor can't
operate.

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“SVC” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Se3” Push the ‘●’ button

Start the vacuum mode : “VACC”

ODU Valve open

ODU EEV open

IDU EEV open

HR unit valve open, SC EEV open

DIP switch off and push the reset button on Master unit PCB

Vacuum Mode

Slave

Master

Slave

Master

1st

1st

1st

Main pipe

Distribution

2nd

2nd

3rd

3rd

Main pipe

Distribution

Slave

Master

1st

3rd

3rd main pipe distribution

2nd

Horizontal Distribution

Distribution Method

19

ENGLISH

WARNING

!

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.

CAUTION

!

To prevent the nitrogen from entering the refrigeration system in
the liquid state, the top of the cylinder must be at higher position
than the bottom when you pressurize the system.

Usually the cylinder is used in a vertical standing position.

Vacuum Drying
Vacuum drying should be made from the service port provided on the outdoor

unit’s service valve to the vacuum pump commonly used for liquid pipe, gas
pipe and high/low pressure common pipe. (Make Vacuum from liquid pipe, gas
pipe and high/low pressure common pipe with the service valve closed.)
* Never perform air purging using refrigerant.

• Vacuum drying: Use a vacuum pump that can evacuate to -100.7 kPa
(-14.6 psi, 5 Torr, -755 mmHg).

- Evacuate the system from the liquid and gas pipes with a vacuum

pump for over 2 hrs and bring the system to -100.7 kPa(-14.6 psi).
After maintaining system under that condition for over 1 hr, confirm
the vacuum gauge rises. The system may contain moisture or leak.

- Following should be executed if there is a possibility of moisture

remaining inside the pipe.
(Rainwater may enter the pipe during work in the rainy season or
over a long period of time)
After evacuating the system for 2 hrs, give pressure to the system
to 0.05 MPa(7.3 psi) (vacuum break) with nitrogen gas and then
evacuate it again with the vacuum pump for 1hr to -100.7 kPa(-14.6
psi)(vacuum drying). If the system cannot be evacuated to -100.7
kPa(-14.6 psi) within 2 hrs, repeat the steps of vacuum break and its
drying. Finally, check if the vacuum gauge does not rise or not, after
maintaining the system in vacuum for 1 hr.

NOTE

!

Always add an appropriate amount of refrigerant. (For the refrigerant
additional charge)
Too much or too little refrigerant will cause trouble.
To use the Vacuum Mode (If the Vacuum mode is set, all valves of Indoor
units and Outdoor units will be opened.)

WARNING

!

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.

WARNING

!

When installing and moving the air conditioner to another site,
recharge 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.

Scale
Use a graviometer. (One that
can measure down to 0.1 kg).
If you are unable to prepare
such a high-precision gravimeter
you may use a charge cylinder.

Indoor unit

Slave 1 outdoor unit Master outdoor unit

Liquide pipe

Gas pipe

Liquide pipe

Gas pipe

Liquid side

Gas side

Close

Close

Close

Close

Vacuum
pump

NOTE

!

If the ambient temperature differs between the time when pressure is
applied and when the pressure drop is checked, apply the following
correction factor

There is a pressure change of approximately 0.01 Mpa(1.5 psi) for each

33.8 °F (1°C) of temperature difference.
Correction= (Temp. at the time of pressurization – Temp. at the time of

check) X 0.1
For example: Temperature at the time of pressurization

3.8 MPa(551 psi) is 80.6°F (27 °C)
24 hour later: 3.73 MPa(541 psi), 68 °F (20 °C)
In this case the pressure drop of 0.07 MPa
(10 psi) is because of temperature drop
And hence there is no leakage in pipe
occurred.

Heat Pump System Installation

Ⓐ Manifold Gauge
Ⓑ Low Pressure Side Handle
Ⓒ High Pressure Side Handle

WARNING

!

• Pipe to be vacuumed : gas pipe, liquid pipe

• If the refrigerant amount is not exact, it may not operate

properly.

• If additionally bottled refrigerant amount is over 10 %, condenser

burst or insufficient indoor unit performance may be caused.

Refrigerant charging

Liquid pipe

Gas pipe

20

ENGLISH

The amount of Refrigerant

The calculation of the additional charge should take into account the
length of pipe and CF(correction Factor) value of indoor unit.

Total liquid pipe : Ø 25.4 mm (1.0 inch)

Additional charge(kg)

Total liquid pipe : Ø 22.2 mm (7/8 inch)

Total liquid pipe : Ø 19.05 mm (3/4 inch)

Total liquid pipe : Ø 15.88 mm (5/8 inch)

Total liquid pipe : Ø 12.7 mm (1/2 inch)

Total liquid pipe : Ø 9.52 mm (3/8 inch)

Total liquid pipe : Ø 6.35 mm (1/4 inch)

CF value of indoor unit

=

+

+

+

+

+

+

× 0.480 kg/m (0.323 lbs/ft)

× 0.354 kg/m (0.238 lbs/ft)

× 0.266 kg/m (0.179 lbs/ft)

× 0.173 kg/m (0.116 lbs/ft)

× 0.118 kg/m (0.079 lbs/ft)

× 0.061 kg/m (0.041 lbs/ft)

× 0.022 kg/m (0.015 lbs/ft)

Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5 kW -1 ea, Ceiling concealed

Duct 7.3 kW-2 ea,
Wall Mounted 2.3 kW-4 ea
CF = [0.64 kg (1.411 lbs)×1EA] + [0.26 kg (0.573

lbs)×2EA] + [0.26 kg (0.529 lbs)×4 EA]
= 2.12 kg (4.67 lbs)

WARNING

!

• Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following
equation for human safety.

If the above equation can not be satisfied, then follow the
following steps.

• Selection of air conditioning system: select one of the next

- Installation of effective opening part

- Reconfirmation of Outdoor Unit capacity and piping length

- Reduction of the amount of refrigerant

- Installation of 2 or more security device (alarm for gas leakage)

• Change Indoor Unit type
: I

nstallation position should be over 2 m (6.6 ft) from the floor (Wall

mounted type ’ Cassette type)

• Adoption of ventilation system
: Choose ordinary ventilation system or building ventilation

system

• Limitation in piping work
: Prepare for earthquake and thermal stress

Volume of the room at which Indoor Unit of

the least capacity is installed

Total amount of refrigerant in the system

≤0.44 kg/m

3

(0.028 lbs/ft3)

Attach the additional refrigerant table of IDU.

Bad example

• Do not insulate gas or low pressure pipe and liquid or
highpressure pipe together.

• Be sure to fully insulate connecting portion.

Ⓐ

These parts are not insulated.

Ⓐ Liquid pipe
Ⓑ Gas pipe
Ⓒ Power lines
Ⓓ

Finishing tape

Ⓔ

Insulating material

Ⓕ

Communication lines

A

C

D

E

B

F

A

Be sure to give insulation work to refrigerant piping by covering liquid
pipe and gas pipe separately with enough thickness heat-resistant
polyethylene, so that no gap is observed in the joint between indoor
unit and insulating material, and insulating materials themselves. When
insulation work is insufficient, there is a possibility of condensation
drip, etc. Pay special attention to insulation work to ceiling plenum.

Ⓐ Heat insulation material
Ⓑ Pipe
Ⓒ Outer covering(Wind the connection part and cutting part of heat

insulation material with a finishing tape.)

Heat insulation

material

Adhesive + Heat - resistant

polyethylene foam + Adhesive tape

Outer

covering

Indoor Vinyl tape

Floor

exposed

Water-proof hemp cloth +

Bronze asphalt

Outdoor

Water-proof hemp cloth +

Zinc plate + Oily paint

NOTE

!

When using polyethylene cover as covering material, asphalt
roofing shall not be required.

Thermal insulation of refrigerant piping

Good example

Ⓐ Liquid pipe
Ⓑ Gas pipe
Ⓒ Power lines
Ⓓ

Insulating material

Ⓔ

Communication lines

Communication lines

Separation

Power lines

E

D

D

B

A

C

21

ENGLISH

A

B

E

B

I

A

B

D

C

1 m

(3.28 ft)

1 m

(3.28 ft)

D

F

F

G

B

G

D

B

H

I

J

A

Penetrations

Ⓐ Sleeve
Ⓑ Heat insulating material
Ⓒ Lagging
Ⓓ Caulking material
Ⓔ Band
Ⓕ Waterproofing layer
Ⓖ Sleeve with edge
Ⓗ Lagging material
Ⓘ Mortar or other incombustible caulking
Ⓙ Incombustible heat insulation material

When filling a gap with mortar, cover the penetration part with steel plate so
that the insulation material will not be caved in. For this part, use
incombustible materials for both insulation and covering. (Vinyl covering
should not be used.)

Inner wall (concealed) Outer wall Outer wall (exposed)

Floor (fireproofing)

Penetrating portion on fire

limit and boundary wall

Roof pipe shaft

Caution

- Follow ordinance of your governmental organization for technical
standard related to electrical equipment, wiring regulations and
guidance of each electric power company.

-

Install the Outdoor Unit communication cable away from the power

source wiring so that it is not affected by electric noise from the power
source. (Do not run it through the same conduit.)

- Be sure to provide designated grounding work to Outdoor Unit.

- Give some allowance to wiring for electrical part box of Indoor and

Outdoor Units, because the box is sometimes removed at the time of
service work.

- Never connect the main power source to terminal block of

communication cable. If connected, electrical parts will be burnt out.

- Use the 2-core shielded wires for communication cable.( mark in

the figure below) If communication cable of different systems are
wired with the same multiplecore cable, the resultant poor
transmitting and receiving will cause erroneous operations. ( mark
in the figure below)

- Only the communication cable specified should be connected to the

terminal block for Outdoor Unit communication.

CAUTION

!

Be sure to correct the outdoor unit to earth. Do not connect ground
wire to any gas pipe, liquid pipe, lightening rod or telephone earth
line. If earth is incomplete, it may cause an electric shock.

WARNING

!

Be sure to have authorized electrical engineers do the electric
work using special circuits in accordance with regulations and this
installation manual.
If power supply circuit has a lack of capacity or electric work
deficiency, it may cause an electric shock or fire.

ELECTRICAL WIRING

2-core shielded cables

Remote
control

Remote
control

Remote
control

Remote
control

Indoor

Unit

Indoor

Unit

1Unit

Master

2Unit

Slave1

3Unit

Slave2

4Unit

Slave3

Master Slave1 Slave2 Slave3

Indoor

Unit

Indoor

Unit

Master Slave

Master Slave

Master Slave1 Slave2

Master Slave1 Slave2

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Multi-Core Cable

Master Slave

Master Slave

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Remote
control

Master Slave1 Slave2 Slave3

Master Slave1 Slave2 Slave3

Indoor

Unit

Indoor

Unit

Remote
control

Remote
control

Indoor

Unit

Indoor

Unit

22

ENGLISH

Master Slave1 Slave2

Master Slave1 Slave2

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

Remote
control

Indoor

Unit

CAUTION

!

When the 400 volt power supply is applied to “N” phase by mistake,
check damaged parts in control box and replace them.

Precautions when laying power wiring

Use round pressure terminals for connections to the power terminal
block.

Round pressure terminal

Power cable

When none are available, follow the instructions below.

- Do not connect wiring of different thicknesses to the power terminal
block. (Slack in the power wiring may cause abnormal heat.)

- When connecting cable which is the same thickness, do as shown in
the figure below.

- For wiring, use the designated power cable and connect firmly, then
secure to prevent outside pressure being exerted on the terminal
block.

- Use an appropriate screwdriver for tightening the terinal screws. A
screwdriver with a small head will strip the head and make proper
tighterning impossible.

- Over-tightening the terminal screws may break them.

CAUTION

!

• Use the 2-core shielded wires for communication cables. Never use
them together with power cables.

• The conductive shielding layer of cable should be grounded to the
metal part of both units.

• Never use multi-core cable

• As this unit is equipped with an inverter, to install a phase leading
capacitor not only will deteriorate power factor improvement effect,
but also may cause capacitor abnormal heating. Therefore, never
install a phase leading capacitor.

• Make sure that the power unbalance ratio is not greater than 2 %.
If it is greater the units lifespan will be reduced.

23

ENGLISH

UXA

UXB

WARNING

!

The temperature sensor for outdoor air should not be exposed to
direct sunlight.

- Provide an appropriate cover to intercept direct sunlight.

NOTE

!

• The figures are based on assumed length of parallel cabling up
to 100 m [328 ft]. For length in excess of 100 m [328 ft] the
figures will have to be recalculated in direct proportion to the
additional length of cable involved.

• If the power supply waveform continues to exhibit some
distortion the recommended spacing in the table should be
increased.

- If the cable are laid inside conduits then the following point
must also be taken into account when grouping various cable
together for introduction into the conduits

- Power cable(including power supply to air conditioner) and
communication cables must not be laid inside the same

- In the same way, when grouping the power wires and
communication cables should not be bunched together.

CAUTION

!

If apparatus is not properly earthed then there is always a risk of
electric shock, the grounding of the apparatus must be carried out
by a qualified person.

CAUTION

!

In case of using the shielded wires, it should be grounded.

Separation of communication and power cables

- If communication and power cables are installed alongside each other
then there is a strong likelihood of operational faults developing due
to interference in the signal wiring caused by electrostatic and
electromagnetic coupling.
The tables below indicates our recommendation as to appropriate
spacing of communication and power cables where these are to be
run side by side

Communication and Power Cables

Communication cable

- Types : shielded wires or unshielded wires

- Cross section : 1.0 ~ 1.5 mm

2

(1.55 × 10-3~ 2.32 × 10-3in2)

- Maximum allowable temperature: 60 °C (140 °F)

- Maximum allowable cable length: under 1 000 m (3 281 ft)

Remote control cable

- Types : 3-core cables

Central control cable

Product type Cable type Diameter

ACP&AC Manager

2-core wires (shielded)

1.0 ~ 1.5 mm

2

(1.55 × 10-3~

2.32 × 10-3in2)

AC Smart

2-core wires (shielded)

1.0 ~ 1.5 mm

2

(1.55 × 10-3~

2.32 × 10-3in2)

Simple central controller

4-core wires (shielded)

1.0 ~ 1.5 mm

2

(1.55 × 10-3~

2.32 × 10-3in2)

AC Ez

4-core wires (shielded)

1.0 ~ 1.5 mm

2

(1.55 × 10-3~

2.32 × 10-3in2)

Current capacity of power cable Spacing

100 V or more

10 A 300 mm (11-13/16 inch)
50 A 500 mm (19-11/16 inch)

100 A 1 000 mm (39-3/8 inch)

Exceed 100 A 1 500 mm (59-1/16 inch)

Control box and connecting position of wiring

- Remove all of the screws at front panel and remove the panel by
pulling it forward.

- Connect communication cable between main and sub outdoor unit
through the terminal block.

- Connect communication cables between outdoor unit and indoor
units through the terminal block.

- When the central control system is connected to the outdoor unit, a
dedicated PCB must be connected between them.

- When connecting communication cable between outdoor unit and
indoor units with shielded cable, connect the shield ground to the
earth screw.

Front Panel

Main Board

External Board

Main power line

terminal block

(Take care of the phase

sequence of 3-phases

4-wires power system)

24

ENGLISH

CAUTION

!

• Some installation site may require attachment of an earth leakage
breaker. If no earth leakage breaker is installed, it may cause an
electric shock.

• Do not use anything other than breaker and fuse with correct
capacity. Using fuse and wire or copper wire with too large capacity
may cause a malfunction of unit or fire.

WARNING

!

• Follow ordinance of your governmental organization for
technical standard related to electrical equipment, wiring
regulations and guidance of each electric power company.

• Make sure to use specified cables for connections so that no
external force is imparted to terminal connections. If
connections are not fixed firmly, it may cause heating or fire.

• Make sure to use the appropriate type of overcurrent protection
switch. Note that generated overcurrent may include some
amount of direct current.

Ground wire

1 The power wire Between the master outdoor unit and slave1

outdoor unit - minimum : 6 mm2[9.3 × 10-3inch2]

2 The power wire Between the slave1 outdoor unit and slave2

outdoor unit - minimum : 4 mm2[6.2 × 10-3inch2]

3 The power wire Between the slave2 outdoor unit and slave3

outdoor unit - minimum : 2.5 mm2[3.875 × 10-3inch2]

h The above standard is CV wire standard.
h Please use the 3-phases 4-wires quadrupole Leakage circuit breaker

of circuit breaker.

The thickness of Minimum wire (mm2[ inch2])

Leakage

circuit breaker

(4P ELCB)

Main power

wire

Branch wire Ground wire

1 Unit

2.5~16

[3.875 × 10

-3

~2.48 × 10-2]

-

2.5~4

[3.875 × 10

-3

~6.2 × 10-3]

Below 20~60 A

100 mA 0.1 s

2 Unit

16~50

[2.48 × 10

-2

~7.75 × 10-2]

-

4~10

[6.2 × 10

-3

~1.55 × 10-2]

Below 75~150 A

100 mA 0.1 s

3 Unit

50~95

[7.75 × 10

-2

~1.4725 × 10-1]

-

10

[1.55 × 10-2]

Below 150~200 A

100 mA 0.1 s

4 Unit

95~120

[1.4725 × 10

-1

~1.86 × 10-1]

-

10~16

[1.55 × 10

-2

~2.48 × 10-2]

Below 200~250 A

100 mA 0.1 s

Field Wiring

Single outdoor unit

R S T N

Switch

Fuse

L

N

Communication cable

(2 Wires Cable)

Power cable

(4 Wires Cable)

Communication cable

(3 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

[Outdoor Unit]

[Indoor Units]

Outdoor

Power supply

(3Ø 4 wires)

Indoor

Power supply

(1Ø 2 wires)

(Main Switch)

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Frequency

Voltage range(V)

Outdoor Indoor
60 Hz 380 V 220 V
50 Hz 380-415 V 220-240 V

Wiring of main power supply and equipment
capacity

- Use a separate power supply for the Outdoor Unit and Indoor Unit.

- Bear in mind ambient conditions (ambient temperature,direct
sunlight, rain water,etc.) when proceeding with the wiring and
connections.

- The cable size is the minimum value for metal conduit wiring. The
power cord size should be 1 rank thicker taking into account the line
voltage drops. Make sure the power-supply voltage does not drop
more than 10 %.

- Specific wiring requirements should adhere to the wiring regulations
of the region.

- Power supply cords of parts of appliances for outdoor use should not
be lighter than polychloroprene sheathed flexible cord.

- Don't install an individual switch or electrical outlet to disconnect
each of indoor unit separately from the power supply.

34 34 34

Master
Outdoor Unit

SODU.B SODU.A IDU.B IDU.A CEN.B CEN.A DRY1 DRY2 GND 12V

Between Indoor and Master Outdoor unit

The GND terminal at the
main PCB is a ‘-’ terminal
for dry contact, it is not
the point to make ground
connection.

WARNING

!

• Indoor Unit ground wires are required for preventing electrical
shock accident during current leakage, Communication disorder by
noise effect and motor current leakage (without connection to
pipe).

• Don't install an individual switch or electrical outlet to disconnect
each of indoor unit separately from the power supply.

• Install the main switch that can interrupt all the power sources in an
integrated manner because this system consists of the equipment
utilizing the multiple power sources.

• If there exists the possibility of reversed phase, lose phase,
momentary blackout or the power goes on and off while the
product is operating, attach a reversed phase protection circuit
locally. Running the product in reversed phase may break the
compressor and other parts.

Series outdoor units

When the power source is connected

In series between the units.

R S T N

Switch

Fuse

L

N

Communication cable

(2 Wires Cable)

Power cable

(4 Wires Cable)

Communication cable

(3 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

[Master]

[Indoor Units]

Outdoor

Power supply

(3Ø 4wires)

Indoor

Power supply

(1Ø 2wires)

(Main Switch)

[Slave1] [Slave2]

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Frequency

Voltage range(V)

Outdoor Indoor
60 Hz 380 V 220 V
50 Hz 380~415 V 220~240 V

25

ENGLISH

Example) Connection of communication cable

[BUS type] [STAR type]

When the power source is supplied to Each outdoor unit individually.

L

N

Communication cable

(2 Wires Cable)

Power cable

(4 Wires Cable)

Communication cable

(3 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

Power cable

(2 Wires Cable)

[Master]

[Indoor Units]

Outdoor

Power supply

(3Ø 4wires)

Indoor

Power supply

(1Ø 2wires)

(Main Switch)

[Slave1] [Slave2]

R S T N

Switch

Fuse

R S T N

Switch

Fuse

R S T N

Switch

Fuse

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Between Indoor and Master Outdoor unit
The communication cables between indoor unit and master outdoor
unit are possible to connect with BUS type or STAR type.

The GND terminal at the main PCB is a ‘-’ terminal for dry contact.
It is not the point to make ground connection.

- Make sure that terminal number of master and slave outdoor units
are matched.(A-A, B-B)

WARNING

!

• Indoor Unit ground wires are required for preventing electrical
shock accident during current leakage, Communication disorder by
noise effect and motor current leakage (without connection to pipe).

• Don't install an individual switch or electrical outlet to disconnect
each of indoor unit separately from the power supply.

• Install the main switch that can interrupt all the power sources in an
integrated manner because this system consists of the equipment
utilizing the multiple power sources.

• If there exists the possibility of reversed phase, lose phase,
momentary blackout or the power goes on and off while the
product is operating, attach a reversed phase protection circuit
locally.
Running the product in reversed phase may break the compressor
and other parts.

WARNING

!

When the total capacity is over than 68 HP, Do not use single
power source for connecting series units.

The First terminal block could be burnt out.

- Connection of communication
cable must be installed like
below figure between indoor
unit to outdoor unit.

- Abnormal operation can be
caused by communication
defect, when connection of
communication cable is installed
like below figure(STAR type).

Frequency

Voltage range(V)

Outdoor Indoor
60 Hz 380 V 220 V
50 Hz 380~415 V 220~240 V

CAUTION

!

It should be wiring power cables or communication cables to
avoid interference with the oil level sensor. Otherwise, That oil
level sensor would be operated abnormally.

Example) Connection of power and communication cable (UXA)

Gap : Over

50mm(1.97’’)

When connecting

Main power lines

/ Ground wire from left side

When connecting

Communication wires

/ Ground wire from left side

Main power
terminal block

Ground wire

Main power

terminal block

Insulation sleeves

attachments

Ground wire

Ground wire
ODU-IDU

Communication
cable

ODU-ODU
Communication
cable

Bottom Side

Main power
terminal block

Ground wire

When connecting
Communication wires
/ Ground wire from
front guide panel

When connecting
Main power lines
/ Ground wire from
front guide panel

Gap : Over
50mm(1.97’’)

Front Side

Fix firmly with cable tie or

clamp cord not to be displaced

Main power line

connection

Communication/Ground

wire connection

SODU.B SODU.A IDU.B IDU.A CEN.B CEN.A DRY1 DRY2 GND 12V

34 34 34

Master

SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2 GND 12V

Outdoor Unit

SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2 GND 12V

SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2 GND 12V

Master
Outdoor unit

Slave1
Outdoor Unit

Slave2
Outdoor Unit

SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2 GND 12V

Slave3
Outdoor Unit

26

ENGLISH

CAUTION

!

It should be wiring power cables or communication cables to avoid
interference with the oil level sensor. Otherwise, That oil level sensor
would be operated abnormally.

Checking the setting of outdoor units

Checking according to DIP switch setting

- You can check the setting values of the Master outdoor unit from the
7 segment LED.
The DIP switch setting should be changed when the power is OFF.

Checking the initial display
The number is sequentially appeared at the 7 segment in 5 seconds

after applying the power. This number represents the setting condition.

[Main Board]

DIP switch

7 segment

SW01C
(Automatic Addressing Setting)

Main power

terminal block

Insulation sleeves

attachments

Ground wire

Ground wire

ODU-IDU
Communication
cable

ODU-ODU
Communication
cable

Main power

terminal block

Ground wire

When connecting
Communication wires
/ Ground wire from
front guide panel

When connecting
Main power lines
/ Ground wire from
front guide panel

Gap : Over
50mm(1.97’’)

Front Side

Fix firmly with cable tie
or clamp cord not to be
displaced

Main power line

connection

Communication/Ground

wire connection

Quick control Setting
In the factory setting, main PCB DIP switch setting is all “OFF”.

- Check and make sure that all the indoor unit model name are
ARNU******4.

- Change the main PCB DIP switch No. 3 “OFF → ON” like below
picture.

- Push the reset button.

7 segmentDIP Switch

Reset button

• Initial display order

• Example) ARUN620LLS5
62 HP 380 V Heat Pump System (Master unit: 18 HP,
Slave 1: 16 HP, Slave 2: 14 HP, Slave 3: 14 HP)

Order No Mean

①

8~26 Master unit capacity

②

10~24 Slave 1 unit capacity

③

10~24 Slave 2 unit capacity

④

10~24 Slave 3 unit capacity

⑤

8~96 Total capacity

⑥

2 Heat Pump

⑦

38 380 V model
46 460 V model
22 220 V model

⑧

50 Product type

① ② ③ ④ ⑤ ⑥ ⑦ ⑧

18 16 14 14 62 2 38 50

Example) Connection of power and communication cable (UXB)

Main power

terminal block

Ground wire

Gap : Over

50mm(1.97’’)

When connecting

Main power lines

/ Ground wire from left side

When connecting

Communication wires

/ Ground wire from left side

Bottom Side

27

ENGLISH

Master/Slave DIP switch setting

• Master Unit

• Slave Unit

DIP switch

setting

ODU Setting

Slave 1

Slave 2

Slave 3

DIP switch

setting

ODU Setting

Factory Setting

Main Board

The Procedure of Automatic Addressing

CAUTION

!

• In replacement of the indoor unit PCB, always perform Automatic
addressing setting again (At that time, please check about using
Independent power module to any indoor unit.)

• If power supply is not applied to the indoor unit, operation error
occur.

• Automatic Addressing has to be performed after more than 3
minutes to improve indoor unit communition when initial power is
supplied.

• Please be sure that all the DIP switch (1~7) of master outdoor unit is
OFF before Automatic Addressing setting

Setting the optional function
Select the mode/function/option/value using ‘▶’, ‘◀’ Button and

confirm that using the ‘●’ button after DIP switch No.5 is turned on.

SW01C (Ɨ: Confirm /
Automatic Addressing)

SW02C (ȭ: backward)

SW04C (X : cancel)

DIP-SW01

7-Segment

SW01D (reset)

SW03C (ȯ: forward)

Automatic Addressing

The address of indoor units would be set by Automatic
Addressing

- Wait for 3 minutes after supplying power.
(Master and Slave outdoor units, indoor units)

- Press RED button of the outdoor units for 5 seconds. (SW01C)

- A “88” is indicated on 7-segment LED of the outdoor unit PCB.

- For completing addressing, 2~7 minutes are required depending on
numbers of connected indoor units

-

Numbers of connected indoor units whose addressing is completed are
indicated for 30 seconds on 7-segment LED of the outdoor unit PCB

- After completing addressing, address of each indoor unit is indicated
on the wired remote control display window. (CH01, CH02,
CH03, ……, CH06 : Indicated as numbers of connected indoor units)

DIP switch

Power On

Waiting 3 minutes

Press RED Button for 5 s

(SW01C)

7-segment LED = 88

Don’t press RED Button

(SW01C)

Waiting about 2~7 minutes

7-segment LED

= 88

YES

OK

Automatic Addressing process start

• Automatic addressing process end Numbers of indoor
unit connected are indicated for 30seconds on
7-segment LED after completing process

NO Check the connections

Indoor address number is displayed on wired remote controller or
indoor unit display window. It is not an error message, will
disappeared when on/off button is pressed on remote controller
ex) Display of 01, 02, ..., 15 means connection of 15 indoor units

and Automatic addressing is completed normally.

of communication cable

7 segment

SW01C
(Automatic Addressing Setting)

28

ENGLISH

Optional Mode Selection Function Selection Option Selection

Remarks

Content

Display (◎)

Content

Display

(◀, ▶ ’ ◎)

Default

Optional

(◀, ▶ ’ ◎)

FDD Fdd

Automatic Refrigerant

Charging (Cooling)

Fd 1 - -

* Refer FDD

guidance

Automatic Refrigerant

Charging (Heating)

Fd 2 - -

Refrigerant Amount

Check (Cooling)

Fd 3 - -

Refrigerant Amount

Check (Heating)

Fd 4 - -

Automatic system

check mode(cooling

or heating)

Fd 7 - -

All IDU operation

(Cooling)

Fd 8 - -

Compulsory

Operation for

1 hour

All IDU operation

(Heating)

Fd 9 - -

Installation Func

Cool & Heat

Selector

Fn 1 oFF

oFF,

oP1~oP2

Saving in

EEPROM

High Static Pressure

Compensation

mode

Fn 2 oFF

oFF,

oP1~oP7

Night Low Noise

mode

Fn 3 oFF

oFF,

oP1~oP12

Overall Defrost

mode

Fn 4

North

America: oFF

Europe: oFF
Tropical: oN

on, oFF

ODU address

setting

Fn 5 0 255

Snow Removal &

Rapid Defrost

Fn 6 oFF

oFF,

oP1~oP3

Airflow Adjusting

for IDU (Heating

capacity up)

Fn 7 oFF on, oFF

Target Pressure

Adjusting

Fn 8 oFF

oFF,

oP1~oP4

Low Ambient Kit Fn 9 oFF on, oFF

High Efficiency

Mode (Cooling

Operation)

Fn 10 oFF on, oFF

Auto Dust Removal

Mode

Fn 11 oFF

oFF,

oP1~oP5

Compressor Max.

Frequency Limit

Fn 12 oFF

oFF,

oP1~oP9

ODU Fan Max.

RPM Limit Mode

settting

Fn 13 oFF

oFF,

oP1~oP7

Smart Load Control

Mode setting

Fn 14 oFF

oFF,

oP1~oP3

Central Control

Connection at

Indoor Unit side

Fn 19 oFF oFF, on

Compressor Input

Current Limit mode

Fn 20 oFF

oFF,

oP1~oP10

Power

Consumption

Display on wired

remote controller

Fn 21

SPL0

SPL0, SPL1

[Pd10~Pd11]

Overall Defrost

Operating in Low

temperature (Heating)

Fn 22 oFF on, oFF

Optional Base panel

Heater

Fn 23 oFF on, oFF

User Idu

Comfort Cooling

Mode setting

Id 10 EAch

* Refer Comfort

Cooling
guidance

Saving in

EEPROM

Service SvC Vaccum Mode SE 3 vACC -

1time / 1

Selection

* Functions save in EEPROM will be maintained continuously, though

the system power was reset.

CAUTION

!

• To perform the otional funtion should be sure that All the IDU is off
mode, unless the function will not be performed.

Function setting

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn1” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :
“oFF”,“op1”,“op2” Push the ‘●’ button

Cool & Heat Selection mode is set

Cool & Heat selector

Mode setting method

CAUTION

!

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

• If use a function, first install a Cool & Heat selector.

Switch Control Function

Switch

(Up)

Switch

(Down)

oFF op1(mode) op2(mode)

Right side

(On)

Left side

(On)

Not operate Cooling Cooling

Right side

(On)

Right side

(On)

Not operate Heating Heating

Left side

(Off)

- Not operate Fan mode Off

Switch (Up)

Switch (Down)

Left side

Right side

29

ENGLISH

FAN Maximum RPM of each step

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn2” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“op1~op7” Push the ‘●’ button

Start the Static pressure compensation mode :

Save the selected option value in EEPROM

Chassis UXA UXB

Max. RPM

Standard 880 1 000

Overload / Low

Temperature

1 000 1 150

op1 860 950
op2 840 900
op3 820 850
op4 800 800
op5 780 750
op6 760 700
op7 740 650

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn3” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“op1~op12” Push the ‘●’ button

Start the Night low noise function :

Save the selected option value in EEPROM

Time Settings

Step Judgment Time(Hr) Operation Time(Hr)

op1 8 9
op2 6.5 10.5
op3 5 12
op4 8 9
op5 6.5 10.5
op6 5 12
op7 8 9
op8 6.5 10

op9 5 12
op10 Continuous operation
op11 Continuous operation
op12 Continuous operation

Noise

Chassis UXA UXB
Capacity 8~14 HP 16~22 HP 24~26 HP

Step Noise(dBA)

op1~op3,op10 55 59 60
op4~op6,op11 52 56 57
op7~op9,op12 49 53 55

CAUTION

!

• Request installer to set the function during installation.

• If ODU RPM changes, cooling capacity may go down.

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn4” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“on” ~ “oFF” Push the ‘●’ button

Overall defrost mode is set

Mode setting

- on: Operate overall defrost

- off: Operate partial defrost

CAUTION

!

• Ask an authorized technician to setting a function.

Setting the ODU address

Mode setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn5” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“0” ~ “255” Push the ‘●’ button

ODU address is set

Overall defrost mode

Mode setting method

Night Low Noise Function

In cooling mode, this function makes the ODU fan operate at low RPM
to reduce the fan noise of ODU at night which has low cooling load.

Night low noise function setting method

High Static Pressure Compensation mode

This function secures the air flow rate of ODU, in case static pressure
has been applied like using duct at fan discharge of ODU.

Static pressure compensation mode setting method

30

ENGLISH

CAUTION

!

• Ask an authorized technician to setting a function.

• If use a function, first install a Central controller.

CAUTION

!

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

Mode setting

setting Mode

oFF Not setting

op1 Snow removal mode

op2 Rapid defrost mode

op3 Snow removal mode. + Rapid defrost mode.

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn6” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“op1” ~ “op3” Push the ‘●’ button

Mode is set

CAUTION

!

• Ask an authorized technician to setting a function.

Step Mode
OFF Not setting

ON Low capacity mode

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn7” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“on” ~ “oFF” Push the ‘●’ button

IDU capacity adjusting is set

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn9” Push the ‘●’ button

Low Ambient Kit Mode is set

Select the Option using ‘▶’, ‘◀’ Button :

“on”,“oFF” Push the ‘●’ button

Low Ambient Kit

Mode setting method

h Reference for functional logic of I/O Module

CAUTION

!

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

• Change a power consumption or capacity.

Setting

Mode

Purpose

Condensing

temperature

variation

Evaporating
temperature

variation

Heat Cool

op1 Increase capacity Increase capacity

+2 °C

(35.6 °F)

-3 °C

(37.4 °F)

op2

Decrease power

consumption

Increase capacity

+2 °C

(35.6 °F)

-1.5 °C

(-34.7 °F)

op3

Decrease power

consumption

Decrease power

consumption

-4 °C

(-39.2 °F)

+2.5 °C

(36.5 °F)

op4

Decrease power

consumption

Decrease power

consumption

-6 °C

(-42.8 °F)

-4.5 °C

(-40.1 °F)

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“op1” ~ “op4” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn8” Push the ‘●’ button

Target pressure is set

Select the Option using ‘▶’, ‘◀’ Button :

“HEAT” , “COOL” Push the ‘●’ button

Target pressure adjusting

Mode setting method

Setting Capacity Up Airflow Adjusting for IDU
(Heating)

If the operation of indoor unit is more than 130 %, the air flow is
operated as low in the all indoor units.

Mode setting method

Snow removal & rapid defrost

Mode setting method

31

ENGLISH

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn10” Push the ‘●’ button

High Efficiency Mode is set

Select the Option using ‘▶’, ‘◀’ Button :

“on”,“oFF” Push the ‘●’ button

Mode Setting

Setting

Operation

time

Operating

time

Repeat

cycle

Detail of function

op1

Stop

+2hour

5minutes 2hour

After product stopped 2 hour, fan operating
5 minutes(Repeated every 2 hours)

op2

stop

+5minutes

3minutes

Twice in

2 hour

after product stopped 5 minutes, fan
operating 3 minutes (Limited to two times
within 2 hours)

op3

stop

+5minutes

3minutes 1 time

after product stopped 2 hour, fan operating
5 minutes(Repeated every 2 hours)

op4

Stop

+1minutes

1minutes 1 time

after product stopped 5 minutes, fan
operating 3 minutes(when io module
connection/one-time operation)

op5

Stop

+1minutes

1minutes

Low

speed

after product stopped 1minutes, fan operating
1 minutes(every time the product stops)

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn11” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“op1”~“op5” Push the ‘●’ button

Auto Dust Removal Mode is set

Function setting

Setting Inverter (Hz)

oFF ­op1 143 Hz
op2 135 Hz
op3 128 Hz
op4 120 Hz
op5 113 Hz
op6 105 Hz
op7 98 Hz
op8 90 Hz
op9 83 Hz

CAUTION

!

• Ask an authorized technician to setting a function.

• If use a function, first install a Central controller.

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn13” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“op1”~“op7” Push the ‘●’ button

ODU Fan Max. RPM Limit Mode is set

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn 12” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :
“oFF”,“op1”,“op9” Push the ‘●’ button

Cool & Heat Selection mode is set

ODU Fan Max. RPM Limit

Mode setting method

Compressor Max. Frequency Limit

Mode setting method

Auto Dust Removal Mode

The ability to set reverse run outdoor fan to remove dust, heat
exchanger.

Mode setting method

High Efficiency Mode (Cooling Operation)

Target low pressure will change according to ODU temperature during
the cooling operation.

Mode setting method

MAX. RPM Limit Setting

Chassis UXA UXB

Fan MAX. RPM

Limit (RPM)

oFF 880 1000
oP1 -20 -50
oP2 -40 -100
oP3 -60 -150
oP4 -80 -200
oP5 -100 -250
oP6 -120 -300
oP7 -140 -350

32

ENGLISH

SLC(Smare Lode Control) Mode

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn14” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“op1”~“op3” Push the ‘●’ button

SLC(Smare Lode Control) Mode is set

Setting Mode Detail of function

oFF Not Setting ­oP1 Smooth Mode Slowly control, a target pressure value
oP2 Normal Mode Normal control, a target pressure value
oP3 Peak Mode Fast control, a target pressure value

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn16” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“Fn19” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“on”,“oFF” Push the ‘●’ button

Central Control Connection at Indoor

Unit side Mode is set

Compressor Input Current Limit

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn20” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“op1”~”op10” Push the ‘●’ button

Compressor Input Current Limit mode is set

Mode Compressor Input Current Limit

op1 95 %
op2 90 %
op3 85 %
op4 80 %
op5 75 %
op6 70 %
op7 65 %
op8 60 %
op9 55 %

op10 50 %

Compressor Input Current Limit

System Input Current Control
Mode setting method

Central Control Connection at Indoor Unit side

Mode setting method

CAUTION

!

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

• If use a function, capacity may go down.

SLC (Smart Load Control)

Function for set the variable target pressure which for the high
efficiency and comport operation depend on ODU load.

Mode setting method

33

ENGLISH

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn21” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“SPL0”,“SPL1”,”Pd10”,”Pd11”Push the ‘●’

button

Power Consumption Display on wired remote

controller Mode is set

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn22” Push the ‘●’ button

Overall Defrost Operating in Low Mode is set

Setting Detail of function

Defualt OFF

Setting ON/OFF Control

Setting Detail of function

SPL0 Not used Smart plug logic

SPL1 Using smart plug logic

Pd10 Not installation

Pd11 PDI was installed

Setting of continous cooling operation

Mode setting Effect

0 No setting
1 Cooling capacity low,Power consumption low
2 Cooling capacity mid,Power consumption mid
3 Cooling capacity high,Power consumption high

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Idu” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Id10” Push the ‘●’ button

EEV pulse appearing

(seg1, seg2:Idu No./seg3, seg4:Mode)

Select the Function using ‘▶’, ‘◀’ Button :

Idu No. setting and Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

Mode setting and Push the ‘●’ button

*Mode can be set 0~3 (”0” is no setting)

Setting of continous cooling operation

Comfort Cooling operation

It is function to reduce the ODU energy consumption by the continuou
s operation without thermo off.

Mode setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn23” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“on” Push the ‘●’ button

Base pan Heater operation mode is set

CAUTION

!

• Function to prevent freezing of ODU base pan in a cold area.

• Heater is accesory.(Sold separately)

Base pan Heater operation

Overall Defrost Operating in Low temperature
(Heating)

Mode setting method

Power Consumption Display on wired remote
controller

Mode setting method

34

ENGLISH

Self-Diagnosis Function

Error Indicator

- This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.

- Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of outdoor unit control board as
shown in the table.

- If more than two troubles occur simultaneously, lower number of error code is first displayed.

- After error occurrence, if error is released, error LED is also released simultaneously.

Error Display
1st,2nd,3rd LED of 7-segment indicates error number, 4th LED indicates unit number.(* = 1: Master, 2: Slave 1, 3: Slave 2, 4: Slave 3)

Ex) 1051 : Error occurrence with error number 105 at No. 1 outdoor unit (=Master unit)

In case of indoor unit error occurrence, the error number is only shown at remote controller
without 7 segment LED of outdoor unit.

Ex) CH → 01 : Error occurrence with error number 01 (at remote controller)

In case of compressor error occurrence, 7 segment LED of outdoor unit control board
will display its error number alternately with compressor number.

Ex) 213 → C23 : It means that compressor error occurred with Error No. 21 at No. 3 Outdoor unit (=Slave2)

* Refer to the DX-Venitilation manual for DX-Venitilation error code.

• 1 : Master outdoor unit error, 2 : salve 1 outdoor unit error

• 3 : slave2 outdoor unit error, 4 : slave3 outdoor unit error

Display Title Cause of Error

0 1 - Air temperature sensor of indoor unit Air temperature sensor of indoor unit is open or short

0 2 - Inlet pipe temperature sensor of indoor unit Inlet pipe temperature sensor of indoor unit is open or short

0 3 -

Communication error : wired remote controller ↔
indoor unit

Failing to receive wired remote controller signal in indoor unit PCB

0 4 - Drain pump Malfunction of drain pump

0 5 -

Communication error : outdoor unit ↔ indoor unit

Failing to receive outdoor unit signal in indoor unit PCB

0 6 - Outlet pipe temperature sensor of indoor unit Outlet pipe temperature sensor of indoor unit is open or short

08 -

Hydro Kit Hot water storage tank Temperature
sensor

Pipe temperature sensor is open or short

0 9 - Indoor EEPROM Error

In case when the serial number marked on EEPROM of
Indoor unit is 0 or FFFFFF

1 0 - Poor fan motor operation

Disconnecting the fan motor connector / Failure of indoor
fan motor lock

1 1 -

Communication error : Hydro Kit Indoor unit ↔
Inv.PCB

Failing to receive Inv. PCB signal in indoor unit

1 2 - Hydro Kit Inv.PCB error Hydro Kit Inv.PCB error

13 -

Hydro Kit Solar heat piping temperature sensor
error

Pipe temperature sensor is open or short

1 4 - Hydro Kit Indoor unit Flow switch error Flow switch flow detection error

1 5 - Hydro Kit Liquid pipe Strange overheat Error Temperature sensor defective or hot water inflow

16 -

Hydro KitIndoor unit Inlet and Outlet pipe
Temperature sensor Error

Pipe temperature sensor is open or short

17 -

Hydro Kit Indoor unit Inlet pipe Temperature
sensor Error
Outside air Introduction duct Inlet pipe
Temperature sensor Error

Pipe temperature sensor is open or short

18 -

Hydro Kit Indoor unit Outlet pipe Temperature
sensor Error

Pipe temperature sensor is open or short

2 1 *

Outdoor Unit Inverter Compressor IPM Fault

Outdoor Unit Inverter Compressor Drive IPM Fault

2 2 *

Inverter PCB Input Over Current(RMS) of Master
Outdoor Unit

Outdoor Unit Inverter PCB Input Current excess (RMS)

2 3 *

Outdoor Unit Inverter Compressor DC Link Low or
High Voltage

System is turned off by Master Outdoor Unit DC Link Low/High
Voltage.

2 4 * Outdoor Unit High Pressure Switch

System is turned off by Master Outdoor Unit high pressure switch.

2 5 *

Outdoor Unit Input Voltage High/ Low Voltage

Over 537V or below 247V (ARUM***LTE5)
Over 310V or below 143V (ARUM***BTE5)
Over 598V or below 320V (ARUM***DTE5)

Indoor unit related errorOutdoor unit related error

Error No.

Repeat

Error No. of Unit

Error No. of Compressor

35

ENGLISH

Display Title Cause of Error

2 6 * Outdoor Unit Inverter Compressor Start Failure

The first start failure by Outdoor Unit Inverter Compressor
abnormality or Compressor locked

2 9 * Outdoor Unit Inverter Compressor Over Current Outdoor Unit Inverter Compressor Fault OR Drive Fault

3 2 *

Outdoor Unit Inverter Compressor1 High
Discharge Temperature

Outdoor Unit Inverter Compressor1 High Discharge Temperature

3 3 *

Outdoor Unit Inverter Compressor2 High
Discharge Temperature

Outdoor Unit Inverter Compressor2 High Discharge Temperature

3 4 * High Pressure of Outdoor Unit High Pressure of Outdoor Unit

3 5 * Low Pressure of Outdoor Unit Low Pressure of Outdoor Unit

4 0 * Outdoor Unit Inverter Compressor CT Sensor Fault Outdoor Unit Inverter Compressor CT Sensor open or short

4 1 *

Outdoor Unit Inverter Compressor1 Discharge
Temperature Sensor Fault

Outdoor Unit Inverter Compressor Discharge Temperature
Sensor open or short

4 2 * Outdoor Unit Low Pressure Sensor Fault Outdoor Unit Low Pressure Sensor open or short

4 3 * Outdoor Unit High Pressure Sensor Fault Outdoor Unit High Pressure Sensor open or short

4 4 * Outdoor Unit Air Temperature Sensor Fault Outdoor Unit Air Temperature Sensor open or short

4 5 *

Outdoor Unit Heat Exchanger Temperature Sensor
(Front side) Fault

Outdoor Unit Heat Exchanger Temperature Sensor(Front side)
open or short

4 6 * Outdoor Unit Suction Temperature Sensor Fault Outdoor Unit Suction Temperature Sensor open or short

4 7 *

Outdoor Unit Inverter Compressor2 Discharge
Temperature Sensor Fault

Outdoor Unit Inverter Compressor2 Discharge Temperature
Sensor open or short

4 9 * Outdoor Unit Faulty IPM Temperature Sensor Outdoor Unit IPM Temperature Sensor short/open

50*

Omitting connection of R, S, T power of Outdoor
Unit

Omitting connection of outdoor unit

5 1 * Excessive capacity of indoor units

Excessive connection of indoor units compared to capacity of
Outdoor Unit

52*

Communication error : inverter PCB ’ Main PCB

Failing to receive inverter signal at main PCB of Outdoor Unit

53*

Communication error : indoor unit ’ Main PCB of
Outdoor Unit

Failing to receive indoor unit signal at main PCB of Outdoor Unit.

57*

Communication error : Main PCB ’ inverter PCB

Failing to receive signal main PCB at inverter PCB of Outdoor Unit

6 0 * Inverter PCB EEPROM Error of Master Outdoor Unit Access Error of Inverter PCB of Outdoor Unit

6 2 * Outdoor Unit Inverter Heatsink High Temperature

System is turned off by Outdoor Unit Inverter Heatsink High
Temperature

65*

Outdoor Unit Inverter Heatsink Temperature
Sensor Fault

Outdoor Unit Inverter Heatsink Temperature Sensor open or
short

6 7 * Outdoor Unit Fan Lock Restriction of Outdoor Unit

7 1 * Inverter CT Sensor Error of Master Outdoor Unit Inverter CT Sensor open or short of Outdoor Unit

7 5 * Outdoor Unit Fan CT Sensor Error Outdoor Unit Fan CT Sensor open or short

7 7 * Outdoor Unit Fan Over Current Error Outdoor Unit Fan Current is over 6A

7 9 * Outdoor Unit Fan Start Failure Error

The first start failure by Outdoor Unit Fan abnormality or Fan
locked

8 6 * Outdoor Unit Main PCB EEPROM Error

Communication Fail Between Outdoor Unit Main MICOM and
EEPROM or omitting EEPROM

8 7 * Outdoor Unit Fan PCB EEPROM Error

Communication Fail Between Outdoor Unit Fan MICOM and
EEPROM or omitting EEPROM

1 0 4*

Communication Error Between Outdoor Unit and
Other Outdoor Unit

Failing to receive Slave Unit signal at main PCB of Outdoor Unit

1 0 5* Outdoor Unit Fan PCB Communication Error Failing to receive fan signal at main PCB of Outdoor unit

1 0 6* Outdoor Unit Fan IPM Fault Error Instant Over Current at Outdoor Unit Fan IPM

Outdoor unit related error

36

ENGLISH

Display Title Cause of Error

1 0 7* Outdoor Unit Fan DC Link Low Voltage Error Outdoor Unit Fan DC Link Input Voltage is under 380V

1 1 3* Outdoor Unit Liquid pipe Temperature Sensor Error Liquid pipe temperature sensor of Outdoor Unit is open or short

1 1 4*

Outdoor Unit Subcooling Inlet Temperature
Sensor Error

Outdoor Unit Subcooling Inlet Temperature Sensor Error

115 *

Outdoor Unit Subcooling Outlet Temperature
Sensor Error

Outdoor Unit Subcooling Outlet Temperature Sensor Error

1 1 6 * Outdoor Unit Oil Level Sensor Error Oil Level Sensor of Outdoor Unit is open or short

145 *

Outdoor unit Main Board - External Board
communication Error

Outdoor unit Main Board - External Board communication Error

1 5 0 * Outdoor Unit Discharge Superheat not satisfied

Outdoor Unit Compressor Discharge Superheat not satisfied
during 5 minutes

151 *

Failure of operation mode conversion at Outdoor
Unit

Failure of operation mode conversion at Outdoor Unit

153 *

Outdoor Unit Heat Exchanger Temperature
Sensor (upper part) Fault

Outdoor Unit Heat Exchanger Temperature Sensor (upper part)
Fault

154 *

Outdoor Unit Heat Exchanger Temperature
Sensor (lower part) Fault

Outdoor Unit Heat Exchanger Temperature Sensor(lower part)
open or short

182 *

Outdoor unit External Board Main-Sub Micom
communication Error

Outdoor Unit Main Board Main-Sub Micom communication
failed

1 8 7 * Hydro - Kit P,HEX bursting error

Inlet water temperature is below 5 degree or water temperature
error during defrosting operation.

1 9 3 * Outdoor Unit Fan Heatsink High Temperature

System is turned off by Outdoor Unit Fan Heatsink High
Temperature

194 *

Outdoor Unit Fan Heatsink Temperature Sensor
Fault

Outdoor Unit Fan Heatsink Temperature Sensor open or short

Network error

2 4 2 * Network error of cntral controller Communication wiring defect

Outdoor unit related error

37

ENGLISH

Checking procedure of limiting concentration

Check Concentration limit along following steps and take appropriate
measure depending on the situation.

Calculate amount of all the replenished refrigerant [kg (lbs)] per each
refrigerant system.

Calculate refrigerant concentration level
Calculate the volume of the room where indoor unit is installed as

single room or the smallest room.

- With partition but opened which
serve passage of air to adjoining
room

- Without partition

Concentration limit is the limit of Freon gas concentration where
immediate measures can be taken without hurting human body
when refrigerant leaks in the air. The Concentration limit shall be
described in the unit of [kg/m

3

(lbs/ft3)] (Freon gas weight per unit

air volume) for facilitating calculation.

Concentration limit: 0.44 kg/m3(0.028 lbs/ft3) (R410A)

Amount of additional
replenished refrigerant

Total amount of
refrigerant in the system
[kg (lbs)]

+

=

Note : In case one refrigerant facility is

divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.

Amount of pre charged
refrigerant per single unit
system

Amount of replenished
refrigerant at factory shipment

Amount of additionally
replenished refrigerant
depending on piping
length or piping
diameter by customer

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Opening

Partition

In the case of opening
without door , or 0.15
% or more openings
(to floor space) both
above and below door)

Outdoor unit

(No.1 system)

Flow of
refrigerant

Indoor unit

Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)

CAUTION FOR REFRIGERANT LEAK

The installer and system specialist shall secure safety against leakage
according to local regulations or standards.
The following standards may be applicable if local regulations are not
available.

Introduction

Though the R410A refrigerant is harmless and incombustible itself ,
the room to equip the air conditioner should be large to such an extent
that the refrigerant gas will not exceed the Concentration limit even if
the refrigerant gas leaks in the room.

Concentration limit

- With partition and without opening which serve as passage of air to
adjoining room

Calculate refrigerant concentration

Total amount of refrigerant

system [kg(lbs)]

Volume of smallest room

whereindoor unit is installed

[m

3

(ft3)]

- In case the result of calculation exceeds the Concentration limit,
perform the same calculations by shifting to the second smallest, and
the third smallest rooms until at last the result is below the
Concentration limit.

= Maximum concentration limit

[kg/m

3

(lbs/ft3)]

(R410A)

In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take

one of the countermeasures shown below:

• Countermeasure 1

Provide opening for ventilation.
Provide 0.15% or More size of opening to floor space both above
and below door, or provide opening without door.

• Countermeasure 2

Provide gas leak alarm linked with mechanical ventilator.

• Countermeasure 3

Reducing the system`s refrigerant quantity by deviding into smaller
separate system.

Outdoor unit

Indoor unit

Smallest
room

Countermeasure 2

Gas leak alarm
Mechanical ventilator

Countermeasure 1

Opening effective to ventilation

Indoor unit

Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.

38

ENGLISH

• Product Name : Air conditioner

• Model Name :

• Additional information : Serial number is refer to the bar code on the

product.

Product Sales Name Model Factory Name

ARUx***LTy5 series

x =

N (Heat Pump), V (Cooling Only), M (Heat Recovery / Heat Pump)
y = E (Basic function), S(Standard)
*** = Numeric; (Cooling capacity)

Product information

Airborne Noise Emission

The A-weighted sound pressure emitted by this product is below 70
dB.

** The noise level can vary depending on the site.

The figures quoted are emission level and are not necessarily safe
working levels.

Whilst there is a correlation between the emission and exposure
levels, this cannot be used reliably to determine whether or not further
precautions are required.

Factor that influence the actual level of exposure of the workforce
include the characteristics of the work room and the other sources of
noise, i.e. the number of equipment and other adjacent processes and
the length of time for which an operator exposed to the noise. Also,
the permissible exposure level can vary from country to country.

This information, however, will enable the user of the equipment to
make a better evaluation of the hazard and risk.

Model Designation

CAUTION

!

• Air conditioners should not be installed in areas where corrosive
gases, such as acid or alkaline gas, are produced.

• Avoid installing the product where it could be exposed to sea
wind (salty wind) directly. It can result corrosion on the product.
Corrosion, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operation.

• If outdoor unit is installed close to the seaside, should avoid
direct exposure to the sea wind.

INSTALLATION GUIDE AT THE
SEASIDE

• Periodic ( 1times per 6 month) cleaning of the dust or salt
particles stuck on the heat exchanger is necessary by using clean
water

In case, to install the outdoor unit on the seaside, set up a windbreak
not to be exposed to the sea wind.

- It should be strong enough like concrete to prevent the sea wind
from the sea.

- The height and width should be more than 150 % of the outdoor unit.

- It should be kept more than 70 cm (2.3 ft) of distance between
outdoor unit and the windbreak for smooth air flow.

Select a well-drained place.

If there is improper installation or maintenance not complying with the
installation guide, product’s performance and reliability is not
guauranteed.

Sea wind

Windbreak

Selecting the location(Outdoor Unit)

If the outdoor unit is to be installed close to the seaside, direct
exposure to the sea wind should be avoided. Install the outdoor unit on
the opposite side of the sea wind direction.

Sea wind

Sea wind