Fujitsu AR 7, AR 18, AR 9, AR 24, AR 12 Installation Manual

AIR CONDITIONER
INDOOR UNIT
Slim Duct Type

INSTALLATION MANUAL

For authorized service personnel only.

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Contents

1. SAFETY PRECAUTIONS .............................................2

1.1. IMPORTANT! Please Read Before Starting ...........2

1.2. Special precautions ................................................ 2

2. ABOUT THIS PRODUCT .............................................. 3

2.1. Precautions for using R410A refrigerant ................ 3

2.2. Special tools for R410A ..........................................3

2.3. For authorized service personnel only. .................. 3

2.4. Accessories ............................................................ 4

2.5. Optional parts ......................................................... 5

3. GENERAL SPECIFICATIONS ...................................... 5

3.1. Type of copper pipe and insulation material ........... 5

3.2. Additional materials required for installation...........5

3.3. Operating range ..................................................... 5

4. ELECTRICAL REQUIREMENT ..................................... 6

5. SELECTING THE MOUNTING POSITION ................... 6

6. INSTALLATION WORK ................................................. 7

6.1A. Installation dimensions

(Ceiling concealed type) ...................................... 7

6.1B. Installation dimensions (Wall mounted type/

Floor standing concealed type) ...........................7

6.2A. Install the unit (Ceiling concealed type) ............... 7

6.2B. Install the unit (Wall mounted type/

Floor standing concealed type) .........................10

7.

PIPE INSTALLATION .................................................. 12

7.1. Selecting the pipe material ................................... 12

7.2. Pipe requirement .................................................. 12

7.3. Flare connection (Pipe connection)...................... 12

7.4. Installing heat insulation ....................................... 13

8. INSTALLING DRAIN PIPES ........................................ 14

8.1A. When drain pump is used .................................. 14

8.1B. When drain pump is not used

(Natural drainage) .............................................. 14

8.2. Install the drain pipe ............................................. 15

9. ELECTRICAL WIRING ................................................ 16

9.1. INDOOR UNIT SIDE ............................................ 17

10. REMOTE CONTROLLER SETTING ........................... 18

10.1. Installing the remote controller ........................... 18

10.2. Setting the dip switches .....................................19

10.3. Function setting .................................................. 19

10.4. Jumper wire setting ............................................ 22

10.5. Test run .............................................................. 22

11. SPECIAL INSTALLATION METHODS ......................... 23

12. OPTIONAL PARTS ..................................................... 23

12.1. External input and external output .....................23

12.2. Remote sensor (Optional parts) ......................... 24

12.3. IR Receiver Unit (Optional parts) ....................... 24

13. ERROR CODES ......................................................... 25

14. CUSTOMER GUIDANCE ............................................ 26

PART No. 9374342419-02

All Fujitsu General products are manufactured to metric units and
tolerances. United States customary units are provided for reference
only. In cases where exact dimensions and tolerances are required,
always refer to metric units.

1. SAFETY PRECAUTIONS

1.1.

IMPORTANT! Please Read Before Starting

When Transporting

Be careful when picking up and moving the indoor and out­door units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin alu­minum fi ns on the air conditioner can cut your fi ngers.

When Installing...

This air conditioning system meets strict safety and operating
standards. As the installer or service person, it is an important
part of your job to install or service the system so it operates
safely and effi ciently.

For safe installation and trouble-free operation, you
must:

• Carefully read this instruction booklet before beginning.

• Follow each installation or repair step exactly as shown.

• Observe all local, state, and national electrical codes.

• Pay close attention to all danger, warning, and caution no­tices given in this manual.

WARNING:

CAUTION:

• Hazard alerting symbols

This symbol refers to a hazard or unsafe
practice which can result in severe personal
injury or death.

This symbol refers to a hazard or unsafe
practice which can result in personal injury
and the potential for product or property dam­age.

Electrical

Safety / alert

If Necessary, Get Help

These instructions are all you need for most installation sites
and maintenance conditions. If you require help for a special
problem, contact our sales/service outlet or your certified
dealer for additional instructions.

...In a Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the unit’s
weight. It may be necessary to construct a strong wood or
metal frame to provide added support.

...In a Room

Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to walls
and fl oors.

...In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents wa­ter damage and abnormal vibration.

...In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a metal
frame.

...In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher than
drifting snow.

When Connecting Refrigerant Tubing

• Keep all tubing runs as short as possible.

• Use the fl are method for connecting tubing.

• Apply refrigerant lubricant to the matching surfaces of the
fl are and union tubes before connecting them, then tighten
the nut with a torque wrench for a leak-free connection.

• Check carefully for leaks before opening the refrigerant
valves.

In Case of Improper Installation

The manufacturer shall in no way be responsible for improper
installation or maintenance service, including failure to follow
the instructions in this document.

1.2. Special precautions

When Wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE PER­SONAL INJURY OR DEATH. ONLY A QUALIFIED,
EXPERIENCED ELECTRICIAN SHOULD ATTEMPT
TO WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tubing
are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this sys­tem. Carefully refer to the wiring diagram and these instruc­tions when wiring. Improper connections and inadequate
earthing (grounding) can cause accidental injury or death.

• Earth (Ground) the unit following local electrical codes.

• Connect all wiring tightly. Loose wiring may cause overheat­ing at connection points and a possible fi re hazard.

En-2

When Servicing

•

Turn the power OFF at the main circuit breaker panel before
opening the unit to check or repair electrical parts and wiring.

•

Keep your fi ngers and clothing away from any moving parts.

• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left inside
the unit being serviced.

• After installation, explain correct operation to the customer,
using the operating manual.

WARNING

Never touch electrical components immediately after the
power supply has been turned off. Electrical shock may
occur. After turning off the power, always wait 5 minutes or
more before touching electrical components.

2. ABOUT THIS PRODUCT

2.1.

Precautions for using R410A refrigerant

The basic installation work procedures are the same as
conventional refrigerant (R22) models.
However, pay careful attention to the following points:

• Since the working pressure is 1.6 times higher than that of
conventional refrigerant (R22) models, some of the piping
and installation and service tools are special. (See the fol­lowing table.)
Especially, when replacing a conventional refrigerant (R22)
model with a new refrigerant R410A model, always replace
the conventional piping and fl are nuts with the R410A piping
and fl are nuts.

• Models that use refrigerant R410A have a different charg­ing port thread diameter to prevent erroneous charging with
conventional refrigerant (R22) and for safety. Therefore,
check beforehand. [The charging port thread diameter for
R410A is 1/2 inch.]

• Be more careful that foreign matter (oil, water, etc.) does not
enter the piping than with refrigerant (R22) models. Also,
when storing the piping, securely seal the opening by pinch­ing, taping, etc

• When charging the refrigerant, take into account the slight
change in the composition of the gas and liquid phases, and
always charge from the liquid phase side whose composi­tion is stable.

Copper pipes

It is necessary to use seamless copper pipes and it is
desirable that the amount of residual oil is less than 0.0014
oz/10 m (33 ft). Do not use copper pipes having a collapsed,
deformed or discolored portion (especially on the interior sur­face). Otherwise, the expansion value or capillary tube may
become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than
when using R22, it is necessary to choose adequate materi­als.
Thicknesses of copper pipes used with R410A are as shown
in the table. Never use copper pipes thinner than that in the
table even when it is available on the market.

WARNING

Do not use the existing (for R22) piping and fl are nuts.

• If the existing materials are used, the pressure inside
the refrigerant cycle will rise and cause failure, injury,
etc. (Use the special R410A materials.)

When installing and relocating the air conditioner,
do not mix gases other than the specifi ed refrigerant
(R410A) to enter the refrigerant cycle.

• If air or other gas enters the refrigerant cycle, the
pressure inside the cycle will rise to an abnormally
high value and cause failure, injury, etc.

2.3. For authorized service personnel only.

2.2. Special tools for R410A

Tool Name Contents of Change

Pressure is high and cannot be
measured with a conventional
gauge. To prevent erroneous
mixing of other refrigerants, the
diameter of each port has been

Gauge Manifold

Charge Hose

Vacuum Pump

Gas Leakage

Detector

changed.
It is recommended the gauge with
seals 30 in. Hg to 768 psi for high
pressure.
30 in. Hg to 551 psi for low pres­sure.

To increase pressure resistance,
the hose material and base size
were changed.

A conventional vacuum pump can
be used by installing a vacuum
pump adapter.

Special gas leakage detector for
HFC refrigerant R410A.

WARNING

For the air conditioner to operate satisfactorily, install it as
outlined in this installation manual.

Connect the indoor unit and outdoor unit with the air
conditioner piping and cords available from your local
distributor. This installation manual describes the correct
connections using the installation set available from your local
distributor.

Installation work must be performed in accordance with
national wiring standards by authorized personnel only.

Do not turn on the power until all installation work is complete.

CAUTION

This installation manual describes how to install the

indoor unit only. To install the outdoor unit, refer to the
installation manual included with the outdoor unit.

• Be careful not to scratch the air conditioner when handling
it.

• After installation, explain correct operation to the customer,
using the operating manual.

En-3

2.4. Accessories

WARNING

For installation purposes, be sure to use the parts supplied by
the manufacturer or other prescribed parts.
The use of non-prescribed parts can cause serious accidents
such as the unit to fall, water leakage, electric shock, or fi re.

The following installation parts are furnished. Use them as
required.

Keep the Installation Manual in a safe place and do not
discard any other accessories until the installation work has
been completed.

Do not discard any accessories needed for installation until
the installation work has been completed.

Name and Shape Q’ty Application

Operating Manual

Name and Shape Q’ty Application

Filter (Small)

2

(AR7/9/

12/24)

Filter (Big)

Drain Hose

Hose Band

2

(AR18)

1

(AR24)

1

For installing drain pipe
3/4 in. (O.D. 1-1/16 in.)

For installing drain hose

Installation Manual

Installation Template

Washer

Coupler Heat
Insulation
(Large)

1

(This book)

1

For positioning the indoor
unit

1

For installing indoor unit

8

For indoor side pipe joint
(Large pipe)

1

Drain Hose Insulation B

Wired Remote
Controller

Remote Controller
Cable

Tapping Screw
(M4 × 16 mm)

1

Insulates the drain hose

1

1

For connecting the
remote controller

1

For installing the remote
controller

2

Coupler Heat
Insulation (Small)

Cable Tie

En-4

1

Small

3

Large 4

For indoor side pipe joint
(Small pipe)

For power supply and
remote controller cable
binding.

For fixing the coupler
heat insulation.

2.5. Optional parts

Description Model No. Application

Wireless Remote
Controller

Wired Remote Con­troller

Simple Remote Con­troller

IR Receiver Unit UTY-LRHUM

Remote Sensor Unit UTY-XSZX

External Control Set UTD-ECS5A

UTY-LNHUM

UTY-RNNUM

UTY-RSNUM

For air conditioner
operation

For air conditioner
operation

For air conditioner
operation

For the wireless
remote controller

Room temperature
sensor

For control input/
output port

CAUTION

Install heat insulation around both the gas and liquid
pipes. Failure to do so may cause water leaks.

Use heat insulation with heat resistance above 248 °F.
(Reverse cycle model only)

In addition, if the humidity level at the installation lo­cation of the refrigerant piping is expected to exceed
70%, install heat insulation around the refrigerant pip­ing. If the expected humidity level is 70-80%, use heat
insulation that is 9/16 in. (15 mm) or thicker and if the
expected humidity exceeds 80%, use heat insulation
that is 13/16 in. (20 mm) or thicker.

If heat insulation is used that is not as thick as speci­fied, condensation may form on the surface of the
insulation. In addition, use heat insulation with heat
conductivity of 0.045 W/(m•K) or less (at 68 °F).

3. GENERAL SPECIFICATIONS

This INSTALLATION MANUAL briefl y outlines where and how
to install the air conditioning system. Please read over the
entire set of instructions for the indoor and outdoor units and
make sure all accessory parts listed are with the system be­fore beginning.

3.1.

Type of copper pipe and insulation material

Copper tubing for connecting the outdoor unit to the indoor
unit and insulation material is available for purchase locally.
When you purchase them, please specify the following.

• Deoxidized annealed copper pipe for refrigerant piping as:

CAUTION

Refer to the Installation Manual for the outdoor unit
for description of allowable pipe length and height
difference.

MODEL

AR7/9/12 1/4 in. (6.35 mm) 3/8 in. (9.52 mm)

AR18 1/4 in. (6.35 mm) 1/2 in. (12.70 mm)
AR24 1/4 in. (6.35 mm) 5/8 in. (15.88 mm)

• Use pipe with water-resistant heat insulation.

• All Fujitsu General products are manufactured to metric
units and tolerances. United States customary units are pro­vided for reference only. In cases where exact dimensions
and tolerances are required, always refer to metric units.

Liquid Pipe Gas Pipe

Diameter

3.2.

Additional materials required for installation

A. Refrigeration (armored) tape
B. Insulated staples or clamps for connecting wire (See your

local electrical codes.)
C. Putty
D. Refrigeration lubricant
E. Clamps or saddles to secure refrigerant piping

3.3. Operating range

Cooling/Dry Mode Heating Mode
Temperature About 64 to 90 °F About 60 to 88 °F
Humidity About 80% or less ─

En-5

4.

ELECTRICAL REQUIREMENT

Always make the air conditioner power supply a special
branch circuit and provide a special switch and receptacle. Do
not extend the power cable.

WARNING

Refer to local codes for acceptable cable type.

Cable Cable size Remarks

Connection cable 14 AWG

3 cable + Earth (Ground)

1Φ 208/230 V

Max. Cable Length: Limit voltage drop to less than 2%. In­crease cable gauge if voltage drop is 2% or more.

5.

SELECTING THE MOUNTING POSITION

Correct initial installation location is important because it is
diffi cult to move unit after it is installed.

WARNING

Install the air conditioner in a location which can with­stand a load of at least 3 times the weight of the main
unit and which will not amplify sound or vibration. If the
installation location is not strong enough, the indoor unit
may fall and cause injuries.

MODEL

Withstandable weight

(Unit weight x 3*)
AR 7/9/12 120 Lbs (54kg)

AR 18 153 Lbs (69kg)

AR 24 179 Lbs (81kg)

CAUTION

Do not install the unit near a source of heat, steam, or
fl ammable gas.

Install the unit where drainage does not cause any trouble.

Install the indoor unit, outdoor unit, power supply cable, and
remote controller cable at least 40 in. (1 m) away from a
television or radio receivers. The purpose of this is to prevent
TV reception interference or radio noise.
(Even if they are installed more than 40 in. (1 m) apart, you
could still receive noise under some signal conditions.)

If children under 10 years old may approach the unit, take
preventive measures so that they cannot reach the unit.

• Decide the mounting position with the customer as
follows:

(1) Install the indoor unit on a place having a suffi cient strength

so that it withstands against the weight of the indoor unit.

(2) The inlet and outlet ports should not be obstructed; the air

should be able to blow all over the room.
(3) Leave the space required to service the air conditioner.
(4) A place from where the air can be distributed evenly

throughout the room by the unit.
(5) Install the unit where connection to the outdoor unit is easy.
(6) Install the unit where the connection pipe can be easily

installed.
(7) Install the unit where the drain pipe can be easily installed.
(8) Install the unit where noise and vibrations are not amplifi ed.
(9) Take servicing, etc., into consideration and leave the spaces.

Also install the unit where the fi lter can be removed.

*In accordance with UL standards.

CAUTION

Do not install the unit in the following areas:

• Area with high salt content, such as at the seaside.
It will deteriorate metal parts, causing the parts to fail or the

unit to leak water.

• Area fi lled with mineral oil or containing a large amount of
splashed oil or steam, such as a kitchen.

It will deteriorate plastic parts, causing the parts to fail or

the unit to leak water.

• Area that generates substances that adversely affect the
equipment, such as sulfuric gas, chlorine gas, acid, or
alkali.

It will cause the copper pipes and brazed joints to corrode,

which can cause refrigerant leakage.

• Area that can cause combustible gas to leak, contains
suspended carbon fibers or flammable dust, or volatile
infl ammables such as paint thinner or gasoline.

If gas leaks and settles around the unit, it can cause a fi re.

• Area where animals may urinate on the unit or ammonia
may be generated.

Do not use the unit for special purposes, such as storing
food, raising animals, growing plants, or preserving precision
devices or art objects.
It can degrade the quality of the preserved or stored objects.

Do not install where there is the danger of combustible gas
leakage.

En-6

6. INSTALLATION WORK

6.1A. Installation dimensions (Ceiling
concealed type)

Provide a service access for inspection purposes.
Do not place any wiring or illumination in the service space,
as they will impede service.

Installation Dimensions

Strong and durable ceiling

unit: in. (mm)

6.1B.

Installation dimensions (Wall mounted
type/Floor standing concealed type)

The wall mounted type/floor standing concealed type re­quires a temperature correction setting. Perform this in “10.3.
Function setting”.

unit: in. (mm)

Left side

1 (10) or
less

1 (10) or
less

Right side
(PIPE side)

Left
side

4 (100) or
more

10 (240) or more

1 (20) or more

1 (20) or more

Service access Ceiling

Indoor unit

12 (300) or
more

12 (300) or more

9ft (2500) or more

Floor

(When no ceiling)

Adjust the wind direction in the room depending on the
shape of blow out opening.

Service access

Unit

Control
box

12 (300) or

4 (100) or

12 (300) or

more

Service space

more

more

Right
side

6 (150)
or more

Left side

6 (150)
or more

4 (100) or
more

4 (100) or
more

Strong and
durable floor

Strong and
durable floor

6.2A. Install the unit (Ceiling concealed
type)

Install the air conditioner in a location which can withstand a
load do at least 5 times the weight of the main unit and which
will not amplify sound or vibration. If the installation location is
not strong enough, the indoor unit may fall and cause injuries.

If the job is done with the panel frame only, there is a risk that
the unit will come loose. Please take care.

6.2A.1. UNIT INSTALLATION EXAMPLE (CEILING
CONCEALED TYPE)

Connect the locally purchased duct.

(1) Inlet side

• Connect the duct to the locally purchased inlet fl ange.

• Connect the fl ange to the body with the locally purchased

tapping screws.

• Wind the inlet flange connecting to the duct with the

aluminum tape etc. to avoid the air discharge.

12 (300) or
more

12 (300) or
more

WARNING

Grill

Inlet air

Strong and

durable floor

Right side
(PIPE side)

Grill

Inlet air

Strong and

durable floor

1 (20) or
more

1 (20) or
more

1 (20) or
more

1 (20) or
more

6 (150)
or
more

Duct

6 (150)
or
more

CAUTION

When the duct is connected to inlet side, remove contained
fi lter and surely attach locally purchased fi lter at inlet opening.

(2) Outlet side

• Connect the duct with adjusting inside of outlet fl ange.

• Wind the outlet flange connecting to the duct with the

aluminum tape etc. to avoid the air discharge.

• Insulate the duct to avoid the dew condensation.

En-7

CAUTION

Check that duct work does not exceed the range of external
static pressure of equipment.

Make sure to insulate ducts to avoid condensation.

Make sure to insulate between ducts and walls if metal ducts
are used.

Please explain handling and washing methods of locally
purchased materials to the customer.

To prevent people from touching the parts inside the unit, be
sure to install grilles on the inlet and outlet ports. The grilles
must be designed in such a way that cannot be removed
without tools.

When connecting the duct to the outlet port of the indoor unit,
be sure to insulate the outlet port and the installation screws
to prevent water from leaking around the port.

AR7/9/12/18 Model

• Set the static pressure outside the unit to 0.36 in. WG or
less (the allowable range is between 0 and 0.36 in. WG).

AR24 Model

• Set the static pressure outside the unit to 0.2 in. WG or
less (the allowable range is between 0 and 0.2 in. WG).

Replace the cover as follows.

• Remove the screws, and then remove cover and fan
guard.

• Install the cover with the screws as shown in the following
illustration.

Model Screw

AR7/9/12 9

AR18 11
AR24 13

Side Inlet - Side Outlet

Insulation material (Field supply)

Aluminum tape

Flange (Field supply)

Air

Duct (Field
supply)

Intake grille

(Field supply)

Side Inlet - Side Outlet (Duct)

Insulation material (Field supply)

Aluminum tape

Flange (Field supply)

Air

Duct (Field
supply)

Intake grille

(Field supply)

Bottom Inlet - Side Outlet

Duct (Field supply)

Air

Air

Flange (Field supply)

Aluminum tape

Tapping screw for
fl ange connection

(M4 x 10 mm /

Field supply)

Air

Screw

Cover

Fan guard

CAUTION

All items removed (cover, fan guard, screws) must be
reinstalled.

Intake grille (Field supply)

Air

Outlet side

unit: in. (mm)

Inlet side

4-5/16

(109)

P7-7/8 (200)

2-3/4

(70)

5-1/8
(130)

unit: in. (mm)

AR7/9/12 AR18 AR24

A 25-9/16 (650) 33-7/16 (850) 41-5/16 (1050)

P7-7/8 (200) × 2

B

= 15-3/4 (400)

P7-7/8 (200) × 3

= 23-5/8 (600)

P7-7/8 (200) × 4

= 31-1/2 (800)

1 (25)

3/4

(19)

7-13/16

1

(25)

1-3/8 (35)

9/16 (15)

7/16

7/16

(198)

(11)

(11)

En-8

6.2A.2. INSTALL THE FILTERS

• Install the fi lters to the unit.

6.2A.4. FIX THE UNIT

(1) Hang the unit

• Use hanger bolts of size M8 or M10 (5/16 or 3/8 in.).

Hanger

Hanger bolt

Nut A (Field
supply)

Washer (Ac­cessories)

Nut B (Field
supply)

Filter (Accessories)

AR7/9/12/18: 2 fi lters
AR24: 3 fi lters

Unit

Filter

6.2A.3. DRILLING HOLES FOR BOLTS AND IN­STALLING THE BOLTS

• Using the installation template, drill holes for bolts (4 holes).

Installation template

Drilling position
for bolts

Hanger bolt

Nut A (Field
supply)

Washer (Ac­cessories)

Nut B (Field
supply)

*:

It might become diffi cult to open and shut the Cover /control

Hanger

Unit

13/16 in.
(20 mm)
length

Cover

box cover when the length exceeds 13/16 in. (20 mm).

(2) Leveling
Base horizontal direction leveling on top of the unit.

Ceiling

Level gauge

Air

(377 mm)

14-13/16 in.

A

unit: in. (mm)

AR7/9/12 AR18 AR24

A 28-7/8 (734) 36-3/4 (934) 44-5/8 (1134)

OK

PROHIBITED

1 in. (10 mm) or less

En-9

Level gauge

Air

CAUTION

Leave a space of 4 in. (100 mm) or more between the inlet
port and the ceiling.

Fasten the unit securely with Nuts A and B.

6.2B. Install the unit (Wall mounted type/
Floor standing concealed type)

WARNING

Install the air conditioner in a location which can withstand a
load do at least 5 times the weight of the main unit and which
will not amplify sound or vibration. If the installation location is
not strong enough, the indoor unit may fall and cause injuries.

If the job is done with the panel frame only, there is a risk that
the unit will come loose. Please take care.

6.2B.1. UNIT INSTALLATION EXAMPLE

(Wall

mounted type/Floor standing concealed type)

Connect the locally purchased duct.

(1) Inlet side

• Connect the duct to the locally purchased inlet fl ange.

• Connect the fl ange to the body with the locally purchased
tapping screws.

• Wind the inlet fl ange connecting to the duct with aluminum
tape etc. to avoid the air discharge.

CAUTION

When duct is connected to inlet side, remove fi lter provided
with unit and attach locally purchased fi lter at return air grille
or in return duct.

(2) Outlet side

• Connect the duct to outlet fl ange.

• Wind the outlet flange connecting to the duct with
aluminum tape etc. to avoid the air discharge.

• Insulate the duct to avoid condensation.

CAUTION

Check that duct work does not exceed the range of external
static pressure of equipment.

Make sure to insulate ducts to avoid condensation.

Make sure to insulate between ducts and walls if metal ducts
are used.

Please explain handling and washing methods of locally
purchased materials to the customer.

To prevent people from touching the parts inside the unit, be
sure to install grilles on the inlet and outlet ports. The grilles
must be designed in such a way that cannot be removed
without tools.

When connecting the duct to the outlet port of the indoor unit,
be sure to insulate the outlet port and the installation screws
to prevent water from leaking around the port.

AR7/9/12/18 Model

• Set the static pressure outside the unit to 0.36 in. WG or less
(the allowable range is between 0 and 0.36 in. WG).

AR24 Model

• Set the static pressure outside the unit to 0.2 in. WG or less
(the allowable range is between 0 and 0.2 in. WG).

En-10

• Remove the screws, and then remove cover and fan
guard.

• Install the cover with the screws as shown in the following
illustration.

Model Screw

AR7/9/12 9

AR18 11
AR24 13

6.2B.2. INSTALL THE FILTERS

• Install the fi lters (Accessories) to the unit.

AR7/9/12/18: 2 fi lters
AR24: 3 fi lters

6.2B.3. INSTALL THE UNIT

• To prevent overturning, attach the unit to the fl oor or the
wall.

• To avoid vibration of the unit, install vibration isolation pad
between the unit and the fl oor or the wall.

Leveling
Level unit before attaching to fl oor or wall.

Level gauge

Filter

Unit

Filter

OK

1 in. or less

(10 mm)

Level gauge

PROHIBITED

1 in. or less

(10 mm)

CAUTION

Fasten the unit securely with Nuts A and B.

PROHIBITEDOK

En-11

7. PIPE INSTALLATION

CAUTION

Be careful that foreign matter (oil, water, etc.) does not enter
the piping with refrigerant R410A models. Also, when storing
the piping, securely seal the openings by pinching, taping,
etc.

While brazing the pipes, be sure to purge with dry nitrogen
gas.

7.1. Selecting the pipe material

CAUTION

Do not use existing pipes.

Use pipes that have clean external and internal sides without
any contamination which may cause trouble during use, such
as sulfur, oxide, dust, cutting waste, oil, or water.

It is necessary to use seamless copper pipes.
Material : Phosphor deoxidized seamless copper pipes
It is desirable that the amount of residual oil is less than 40
mg/10 m (33 ft).

Do not use copper pipes that have a collapsed, deformed,
or discolored portion (especially on the interior surface).
Otherwise, the expansion valve or capillary tube may become
blocked with contaminants.

Improper pipe selection will degrade performance. As an air
conditioner using R410A incurs pressure higher than when
using conventional refrigerant, it is necessary to choose
adequate materials.

7.2. Pipe requirement

CAUTION

Refer to the Installation Manual of the outdoor unit for
description of the length of connecting pipe or for difference
of its elevation.

• Use pipe with water-resistant heat insulation.

CAUTION

Install heat insulation around both the gas and liquid pipes.
Failure to do so may cause water leaks.
Use heat insulation with heat resistance above 248°F.
(Reverse cycle model only)
In addition, if the humidity level at the installation location
of the refrigerant piping is expected to exceed 70 %, install
heat insulation around the refrigerant piping. If the expected
humidity level is 70-80 %, use heat insulation that is
9/16 in. (15mm) or thicker and if the expected humidity
exceeds 80 %, use heat insulation that is 13/16 in. (20mm)
or thicker. If heat insulation is used that is not as thick
as specified, condensation may form on the surface of
the insulation. In addition, use heat insulation with heat
conductivity of 0.045 W/(m·K) or less (at 68°F).

7.3. Flare connection (Pipe connection)

WARNING

Tighten the flare nuts with a torque wrench using the
specifi ed tightening method. Otherwise, the fl are nuts could
break after a prolonged period, causing refrigerant to leak
and generate a hazardous gas if the refrigerant comes into
contact with a fl ame.

•

Thicknesses of copper pipes used with R410A are as
shown in the table.

•

Never use copper pipes thinner than those indicated in the
table even if they are available on the market.

Thicknesses of Annealed Copper Pipes (R410A)

Pipe Outside Diameter [in. (mm)] Thickness [in. (mm)]

1/4 (6.35) 0.032 (0.80)

3/8 (9.52) 0.032 (0.80)
1/2 (12.70) 0.032 (0.80)
5/8 (15.88) 0.039 (1.00)
3/4 (19.05) 0.047 (1.20)

7.3.1. Flaring

• Use special pipe cutter and fl are tool exclusive for R410A.

(1)

Cut the connection pipe to the necessary length with a
pipe cutter.

(2)

Hold the pipe downward so that cuttings will not enter the

pipe and remove any burrs.

(3)

Insert the fl are nut (always use the fl are nut attached to
the indoor and outdoor units respectively) onto the pipe
and perform the fl are processing with a fl are tool. Use
the special R410A flare tool, or the conventional flare
tool. Leakage of refrigerant may result if other fl are nuts
are used.

(4)

Protect the pipes by pinching them or with tape to pre­vent dust, dirt, or water from entering the pipes.

En-12

Check if [L] is fl ared uniformly

Wid

oss

flats

and is not cracked or scratched.

Die

A

Pipe

Pipe Outside
Diameter [in.

(mm)]

1/4 (6.35)

Dimension A [in.

(mm)]

Flare Tool for R410A,

Clutch Type

Dimension B

[in. (mm)]

3/8 (9.1)

-00.4

3/8 (9.52) 1/2 (13.2)

1/2 (12.70) 5/8 (16.6)

0 to 0.020 (0 to 0.5)
5/8 (15.88) 3/4 (19.7)
3/4 (19.05) 15/16 (24.0)

When using conventional fl are tools to fl are R410A pipes,
the dimension A should be approximately 0.020 in. (0.5 mm)
more than indicated in the table (for fl aring with R410A fl are
tools) to achieve the specifi ed fl aring. Use a thickness gauge
to measure the dimension A.

Width across

th acr

fl ats

Pipe Outside

Diameter [in. (mm)]

Width Across Flats of

Flare Nut [in. (mm)]

1/4 (6.35) 11/16 (17)

3/8 (9.52) 7/8 (22)
1/2 (12.70) 1 (26)
5/8 (15.88) 1-1/8 (29)
3/4 (19.05) 1-7/16 (36)

7.3.2. Bending pipes

•

If pipes are shaped by hand, be careful not to collapse
them.

•

Do not bend the pipes in an angle more than 90°.

•

When pipes are repeatedly bend or stretched, the material
will harden, making it diffi cult to bend or stretch them any
more.

•

Do not bend or stretch the pipes more than 3 times.

CAUTION

To prevent breaking of the pipe, avoid sharp bends.

If the pipe is bent repeatedly at the same place, it will break.

7.3.3. Pipe connection

CAUTION

Be sure to install the pipe against the port on the indoor unit
correctly. If the centering is improper, the flare nut cannot
tighten smoothly. If the fl are nut is forced to turn, the threads
will be damaged.

Do not remove the flare nut from the indoor unit pipe until
immediately before connecting the connection pipe.

Hold the torque wrench at its grip, keeping it at a right angle
with the pipe, in order to tighten the fl are nut correctly.

Tighten the fl are nuts with a torque wrench using the specifi ed
tightening method. Otherwise, the fl are nuts could break after
a prolonged period, causing refrigerant to leak and generate
a hazardous gas if the refrigerant comes into contact with a
fl ame.

CAUTION

Connect the piping so that the control box cover can easily be
removed for servicing when necessary.

In order to prevent water from leaking into the control box,
make sure that the piping is well insulated.

When the fl are nut is tightened properly by your hand, hold
the body side coupling with wrench, then tighten with a
torque wrench. (See the following table for the fl are nut tight-
ening torques.)

Tighten with 2 wrenches.

Holding spanner

Torque wrench

Indoor unit pipe
(Body side)

Flare nut

Connection pipe

Flare Nut [in. (mm)] Tightening Torque [lbf·ft (N·m)]

1/4 (6.35) dia. 11.8 to 13.3 (16 to 18)

3/8 (9.52) dia. 23.6 to 31.0 (32 to 42)
1/2 (12.70) dia. 36.1 to 45.0 (49 to 61)
5/8 (15.88) dia. 46.5 to 55.3 (63 to 75)
3/4 (19.05) dia. 66.4 to 81.1 (90 to 110)

7.4. Installing heat insulation

Install the heat insulation material after performing a refriger­ant leak check (see the Installation Manual for the outdoor
unit for details).

7.4.1. COUPLER HEAT INSULATION

• Insulate with the coupler heat insulation (Accessories)
around the gas pipe and liquid pipe at indoor unit.

• After installing the coupler heat insulation, wrap both ends
with vinyl tape so that there is no gap.

• After affi xing the coupler heat insulation, secure it with 2
cable ties (large), one on each end of the insulation.

• Make sure that the cable ties overlap the heat insulation
pipe.

Coupler heat
insulation (Acces­sories)

Cable tie (Large)
(Accessories)

After checking for gas leaks (refer to the Installation Manual of
the outdoor unit), perform this section.

Install heat insulation around both the large (gas) and small
(liquid) pipes. Failure to do so may cause water leaks.

Cover this portion with
heat insulation.

Heat insulation

CAUTION

En-13

8. INSTALLING DRAIN PIPES

WARNING

Do not insert the drain piping into the sewer where sulfurous
gas occurs. (Heat exchange erosion may occur)

Insulate the parts properly so that water will not drip from the
connection parts.

Check for proper drainage after the construction by using the
visible portion of transparent drain port and the drain piping
fi nal outlet on the body.

CAUTION

Do not apply adhesive agent on the drain port of the body.
(Use the attached drain hose and connect the drain piping)

8.1A. When drain pump is used

• Use general hard polyvinyl chloride pipe ø 3/4 in. (19 mm)
[I.D.], ø 1-1/16 in. (27 mm) [O.D.].

• Do not perform a rise, trap and air bleeding.

• Provide a downward gradient (1/100 or more).

• Provide supporters when long pipes are installed.

• Use an insulation material as needed, to prevent the pipes
from freezing.

• Install the pipes in a way that allows for the removal of the
control box.

Gap of 5 to 6ft (1.5 to 2 m)

Locally arranged pipe

Max. 11-13/16 in.
(300 mm)

Horizontal or
upward gradient

[O.D.1-1/16 in.
(27 mm)] or more

27-9/16 in. (700
mm) or less

GOOD

Air bleeding

Supporter

Rise

8.1B.

When drain pump is not used (Natural
drainage)

CAUTION

Set “Drainage function setting (JM1)” in “10.4. Jumper wire set­ting.”
Drain pump cannot be used if it is installed in wall mounted type/
fl oor standing concealed type.

If the drain pump is not used, please replace with the drain
cap.

Ceiling concealed type

Wall mounted type /

Floor standing concealed type

• Use general hard polyvinyl chloride pipe ø 3/4 in. (19 mm)
[I.D.], ø 1-1/16 in.(27 mm) [O.D.] .

• Do not perform a rise, trap and air bleeding.

• Provide a downward gradient (1/100 or more).

• Provide supporters when long pipes are installed.

• Use an insulation material as needed, to prevent the pipes
from freezing.

• Install the pipes in a way that allows for the removal of the
control box.

(1) Ceiling concealed type

Gap of 5 to 6ft (1.5 to 2 m)

Downward gradient

0.10-0.19 in.

(2.5-5.0 mm)

Supporter

3-15/16 in. (100 mm) or more

Trap

PROHIBITED

Observe the following procedures to construct centralized
drain pipe fi ttings.

[O.D.1-5/16 in. (33 mm)] or more

Downward gradient 1/100 or more

27-9/16 in.
(700 mm) or less

En-14

Locally arranged pipe

[O.D.1-1/16 in.
(27 mm)] or more

GOOD

Air bleeding

Trap

Rise

PROHIBITED

Observe the following procedures to construct centralized
drain pipe fi ttings.

[O.D.1-5/16 in.
(33 mm)] or more

Downward gradient
1/100 or more

(2)

Wall mounted type / Floor standing concealed type

Downward gradient 0.10-

0.19 in. (2.5-5.0 mm)

3-15/16 in.
(100 mm)
or more

[O.D.1-1/16 in.
(27 mm)] or more

(2) Be sure to connect Drain pipe with adhesive (polyvinyl

chloride) so that there is no leakage.

Applying
area of
adhesive

3/16 in. (4 mm) or less

Joint pipe
(Field supply)

Drain pipe [3/4 in. (19 mm)
O.D.1-1/16 in. (27 mm)] (Field supply)

Locally arranged pipe

GOOD

Air bleeding

Trap

Rise

PROHIBITED

Observe the following procedures to construct centralized
drain pipe fi ttings.

[O.D.1-5/16 in.
(33 mm)] or more

Downward gradient
1/100 or more

8.2. Install the drain pipe

(1) Be sure to use supplied Drain hose 1 and Hose band 2

Hose band

2

Drain hose

1

Drain
hole

Hard PVC side

CAUTION

Do not connect to the Drain hole with adhesive. Using
adhesive may cause damage and water leaks.

(3) After installing the Drain hose 1, check if the drainage is

smooth.

CAUTION

To prevent excessive force on Drain hose 1, avoid bends or
twists. (To bend or twist may cause water leaks.)

(4) After checking for drainage, attach the Drain hose

insulation B 3 to insulate, following the instructions as in
the fi gures.

To avoid space with Drain hose 1 and Hose band 2,
press fi rmly the Drain hose insulation B 3.

Ensure there is
no space.

3

Drain hose

insulation B

• STEP1~STEP3

Butt the insulation
against the unit.

Unit

Hose band

3/16 in. (4 mm) or less

13/16 in. (20 mm)

1

Drain hose

2

Fasten the Hose band
horizontal against earth (ground).

The Hose band
side of the Drain hose

at the position where

2

must be positioned at the right

1

as in the fi gure.

2

Hose band

STEP 1

Press fi rmly

STEP 2

Slit

Press fi rmly

Slit

Press fi rmly

En-15

Slit

Press fi rmly

9. ELECTRICAL WIRING

Press fi rmly

Roll the in­sulation over
the joint.

STEP 3

• FINISH
Check that there is no gap between the unit and the drain

hose insulation.

• When drain pump is used. (Ceiling concealed type only)

Do not cover the
panel window.

• When drain pump is not used. (Natural drainage)

WARNING

Before starting work, check that power is not being supplied
to the indoor unit and outdoor unit.

Match the terminal board numbers and connection cord colors
with those of the outdoor unit or branch box. Erroneous wiring
may cause burning of the electric parts.

Connect the connection cords firmly to the terminal board.
Imperfect installation may cause a fire.

Always fasten the outside covering of the connection cord
with the cable clip. (If the insulator is chafed, electric leakage
may occur.)

Always connect the earth (ground) wire.

(1) Use ring terminals with insulating sleeves as shown in the

following fi gure to connect to the terminal block.

(2) Securely clamp the ring terminals to the wires using an

appropriate tool so that the wires do not come loose.
Use the specifi ed wires, connect them securely, and fasten

(3)

them so that there is no stress placed on the terminals.

(4)

Use an appropriate screwdriver to tighten the terminal screws.

Do not use a screwdriver that is too small, otherwise, the

screw heads may be damaged and prevent the screws
from being properly tightened.

(5) Do not tighten the terminal screws too much, otherwise,

the screws may break.

(6) See the table 1 for the terminal screw tightening torques.

Do not cover the
control box cover.

Note: Check for drainage

Pour about 1 liter of water from the position shown in the dia­gram or from the airfl ow outlet to the dew tray. Check for any
abnormalities such as strange noises and whether the drain
pump functions normally.

CAUTION

Make sure the drain water is properly drained.

Strip 6/16 in. (10 mm)

Screw with
special washer

Wire

Use ring terminals and tighten the terminal screws to the
specified torques, otherwise, abnormal overheating may be
produced and possibly cause heavy damage inside the unit.

Ring terminal

Terminal
board

Terminal block

Ring terminal

Wire

WARNING

Sleeve

Screw with
special washer

Ring
terminal

Table 1

Tightening Torque

M4 screw 11 to 16 lbf·in (1.2 to 1.8 N·m)

En-16

9.1. INDOOR UNIT SIDE

(1) Remove the control box cover from the control box.

Cover

Cable tie (Small)
(Accessories)

Remote controller cable

Screw

(2) Cable connection

• Connect the connection cable to the terminal board.

• Connect the remote controller cable to the terminal board.

• Fix the remote controller cable to the control box cover
with a nylon clamp.

Remote controller cable

1: Red
2: White
3: Black

Cable tie (Small)

(Accessories)

Conduit (Field supply)

Earth (Ground)

Power supply

cable

φ7/8 in.
(22.2 mm)

Conduit (Field
supply)

Conduit (Field supply)

Power supply cable

(3) Wiring system diagram

INDOOR UNIT SIDE

UNIT

DISCONNECT
SWITCH (Field

supply)

INDOOR

TERMINAL

Remote controller line

14AWG
(Inter-unit)
Power lines

Power line

Control line

Earth (Ground)
line

OUTDOOR UNIT

or BRANCH BOX

Disconnect Switch - Field supplied if required by local code.
Select the correct capacity of disconnect switch according to

the load.

CAUTION

Tighten the indoor unit connection cable and power
supply indoor and outdoor unit, branch box terminal
board connections fi rmly with the terminal board screws.
Faulty connection may cause a fi re.

If the indoor unit connection cable and power supply are
wired incorrectly, the air conditioner may be damaged.

Connect the indoor unit connection cable by matching
the numbers of the outdoor, branch box and indoor units
terminal board numbers as shown in terminal label.

Earth (Ground) both the indoor, outdoor and branch box
units by attaching a earth (ground) cable.

Unit shall be earthed (grounded) in compliance with the
applicable local and national rules.

WARNING

Disconnect switch for over current protection given in
the system diagram is to be installed between the indoor
unit and the outdoor unit, branch box.

CAUTION

Be sure to refer to the previous diagram for do correct fi eld
wiring. Wrong wiring causes malfunction of the unit.

Check local electrical rules and also any specific wiring
instructions or limitations.

En-17

10. REMOTE CONTROLLER SETTING

.

CAUTION

When detecting the room temperature
using the remote controller, please
set up the remote controller accord­ing to the following conditions. If the
remote controller is not located prop­erly, the correct room temperature
will not be detected, and thus abnor­mal conditions like “not cooling” or
“not heating” will occur even if the
air-conditioner is running normally.

• Locate where an average temperature for the room
being air conditioned will be sensed.

• Do not locate where it may be directly exposed to the
outlet air from the air-conditioner.

• Locate out of direct sunlight.

• Locate away from the infl uence of other heat sources.

Do not touch the remote controller PC board and PC
board parts directly with your hands.

Do not wire the remote controller cable together with or
parallel to the connection cables, and power supply ca­ble of the INDOOR UNIT, OUTDOOR UNIT, and BRANCH
BOX. It may cause erroneous operation.

When installing the bus wire near a source of electro­magnetic waves, use shielded wire.

Do not set the DIP switches, either on the air condi­tioner or the remote controller, in any way other than
indicated in this manual that is supplied with the air
conditioner. Doing so may result in improper operation.

Temperature
sensor

Hole

Cable tie
(Small)

[Example]

1. Red

Box

Rear case

4-3/4 (120)

2. White

3. Black

CAUTION

When connecting the
remote controller wires, do
not overtighten the screws.

Remote control­ler cable

Connector

Screws

4-3/4 (120)

11/ 16

(17)

10.1. Installing the remote controller

Open the operation panel on the front of the remote control­ler, remove the 2 screws indicated in the following fi gure, and
then remove the front case of the remote controller.

When installing the remote controller, remove the connector
from the front case. The wires may break if the connector is
not removed and the front case hangs down.
When installing the front case, connect the connector to the
front case.

Front case

SET BACK

Screws

(back side)

Connector

Rear case

When remote controller cable is concealed
(1) Conceal the remote controller cable.
(2) Pass the remote controller cable through the hole in the

rear case and connect the remote controller cable to the
remote controller terminal board specifi ed in fi gure.

(3) Clamp the remote controller cable sheath with the cable

tie as shown in fi gure.
(4) Cut off the excess cable tie.
(5) Install the rear case to the wall, box, etc., with 2 screws

fi gure.

En-18

(45.3)

1-13/16

1-3/16

Hole

(30)

3/16 (4.5)

1-5/16

(33.5)

7/8

(23)

5/16

(8)

3/16 (4.5)

5/8

(15.3)

2-1/2 (63.5)

3-5/16 (83.5)

1/2

(12.5)

(4.5)

1/4

(6)

3/16

Hole ×2

Hole ×3

unit: in. (mm)

CAUTION

Install the remote controller wires so as not to be touched
directly with your hand.

Do not touch the remote controller PC board and PC
board parts directly with your hands.

10.2. Setting the dip switches

Set the remote controller DIP switches.

[Example]

Front case (back side)

OFF

1
2
3
4
5
6

DIP switch 1

SW state

OFF ON

★

★

★

★

★

★

Invalidity Validity

Cannot be used.
(Do not change)

Dual remote controller setting
* Refer to "DUAL REMOTE

CONTROLLERS" in "11.
SPECIAL INSTALLATION
METHODS".

Use prohibited.
(Do not change)

Use prohibited.
(Do not change)

Use prohibited.
(Do not change)

Memory backup setting
* Set to ON to use batteries

for the memory backup. If
batteries are not used, all of
the settings stored in mem­ory will be deleted if there is
a power failure.

DIP­Switch 1

NO.

SW

1

SW

2

SW

3

SW

4

SW

5

SW

6

ON

ON

(★ Factory setting)

Detail

(2) Press the SET BACK button to select the indoor unit num-

ber.

SET BACK

SUMOTUWETH FR

SA

Unit number of INDOOR UNIT

(3) Press the Set time ( ) buttons to select the function

number.

SUMOTUWETH FR

SA

Function number

(4) Press the SET TEMP. buttons ( ) ( ) to select the setting

value.
The display fl ashes as shown to the right during setting

value selection.

10.3. Function setting

This procedure changes the function settings used to control
the indoor unit according to the installation conditions. Incor­rect settings can cause the indoor unit to malfunction. This
procedure should be performed by authorized installation or
service personnel only.

Perform the Function Setting according to the installation con­ditions using the remote controller. (Refer to the indoor unit
installation manual for details on the function numbers and
setting values.)

(1) Press the SET TEMP. buttons ( ) ( ) and FAN button

simultaneously for more than 5 seconds to enter the func-

tion setting mode.

SUMOTUWETH FR

SA

SUMOTUWETH FR

SA

Setting value

(5) Press the TIMER SET button to confi rm the setting.

Press the TIMER SET button for a few seconds until the set­ting value stops fl ashing.
If the setting value display changes or if “- -” is displayed
when the fl ashing stops, the setting value has not been set
correctly.
(An invalid setting value may have been selected for the
indoor unit.)

(6) Repeat steps 2 to 5 to perform additional settings.

Press the SET TEMP. buttons (

) ( ) and FAN button
simultaneously again for more than 5 seconds to cancel the
function setting mode. In addition, the function setting mode
will be automatically canceled after 1 minute if no operation
is performed.

(7) After completing the FUNCTION SETTING, be sure to turn

off the power and turn it on again.

En-19

10.3.1. Function Details

Filter sign

Select appropriate intervals for displaying the fi lter sign on the
indoor unit according to the estimated amount of dust in the
air of the room.
If the indication is not required, select "No indication" (03).

(♦... Factory setting)

Function

Number

11

Setting

Value

00 Standard (400 hours)
01 Long interval (1000 hours)
02 Short interval (200 hours)
03 No indication ♦

Setting Description

Static pressure

Select the appropriate static pressure according to the instal­lation conditions.

Function

Number

26

Range of static pressure is different by model.

Model Name Range of Static Pressure

ARU7RLF

ARU9RLF
ARU12RLF
ARU18RLF
ARU24RLF 0 to 0.2 in. WG (0 to 50 Pa)

Setting

Value

00 0 in. WG (0 Pa)
01 0.04 in. WG (10 Pa)
02 0.08 in. WG (20 Pa)
03 0.12 in. WG (30 Pa)
04 0.16 in. WG (40 Pa)
05 0.20 in. WG (50 Pa)
06 0.24 in. WG (60 Pa)
07 0.28 in. WG (70 Pa)
08 0.32 in. WG (80 Pa)
09 0.36 in. WG (90 Pa)

31

0 to 0.36 in. WG (0 to 90 Pa)

(♦... Factory setting)

Setting Description

0.1 in. WG (25 Pa)
[Standard]

♦

Auto restart

Enable or disable automatic restart after a power interruption.

(♦... Factory setting)

Function

Number

40

* Auto restart is an emergency function such as for power

outage etc. Do not attempt to use this function in normal
operation. Be sure to operate the unit by remote controller or
external device.

Setting

Value

00 Enable ♦
01 Disable

Setting Description

Room temperature sensor switching

(Only for Wired remote controller)
When using the Wired remote controller temperature sensor,

change the setting to "Both" (01).

(♦... Factory setting)

Function

Number

42

00: Sensor on the indoor unit is active.
01: Sensors on both indoor unit and wired remote controller

are active.

* Remote controller sensor must be turned on by using the

remote controller

Setting

Value

00 Indoor unit ♦
01 Both

Setting Description

Remote controller custom code

(Only for wireless remote controller)
The indoor unit custom code can be changed.
Select the appropriate custom code.

(♦... Factory setting)

Function

Number

44

Setting

Value

00 A ♦
01 B
02 C
03 D

Setting Description

External input control

"Operation/Stop" mode or "Forced stop" mode can be selected.

Function

Number

46

Setting

Value

00 Operation/Stop mode ♦
01 (Setting prohibited)
02 Forced stop mode

(♦... Factory setting)

Setting Description

Room temperature sensor switching (Aux.)

To use the temperature sensor on the wired remote controller
only, change the setting to "Wired remote controller" (01). This
function will only work if the function setting 42 is set at "Both"
(01)

(♦... Factory setting)

Function

Number

48

Setting

Value

00 Both
01 Wired remote controller ♦

Setting Description

Setting record

Record any changes to the settings in the following table.



Setting Setting Value

Filter sign
Static pressure
Auto restart
Room temperature sensor switching
Remote controller custom code
External input control
Room temperature sensor switching (Aux.)

After completing the Function Setting, be sure to turn off the
power and turn it on again.

En-20

10.3.2. Temperature Correction

NOTE:

When changing Function 95, perform this setting before other
Room temp. control settings (Function 30, 31, 92, 93).
If Function 95 is not set fi rst, Room temperature control set-
tings (Function 30, 31, 92, 93) will be reset and you must re­do them again.

Heat Insulation condition (building insulation)

Heat insulation conditions differ according to the installed en­vironment.
Standard insulation "00" allows system to rapidly respond to
the cooling or heating load changes.
High insulation "01" is when the heat insulation structure of
the building is high and does not require system to rapidly re­spond to cooling or heating load changes.
When High insulation "01" is selected;

• Overheating (overcooling) is prevented at the start-up.

• All room temp. control settings (Function 30, 31, 92, 93) will
reset to No correction [0.0°F (0.0°C)].

(♦... Factory setting)

Function

Number

95

Setting

Value

00 Standard insulation ♦
01 High insulation

Setting Description

Room temperature control for indoor unit sensor

Depending on the installed environment, correction of the
room temperature sensor may be required.
Select the appropriate control setting according to the in­stalled environment.
The temperature correction values show the difference from
the Standard setting "00" (manufacturer's recommended
value).

* When Function 95-01(High insulation) is set, the Standard

setting "00" will be the same as No correction "01" [0.0°F
(0.0°C)].

Function

Number

30

(For

cooling)

heating)

In case of Slim duct type and Floor/Ceiling type models:
In fl oor console installations, select “01”.

31

(For

Setting

Value

00 Standard setting* ♦
01 No correction 0.0°F (0.0°C)
02 -1°F (-0.5°C)
03 -2°F (-1.0°C)
04 -3°F (-1.5°C)
05 -4°F (-2.0°C)
06 -5°F (-2.5°C)
07 -6°F (-3.0°C)
08 -7°F (-3.5°C)
09 -8°F (-4.0°C)
10 +1°F (+0.5°C)
11 +2°F (+1.0°C)
12 +3°F (+1.5°C)
13 +4°F (+2.0°C)
14 +5°F (+2.5°C)
15 +6°F (+3.0°C)
16 +7°F (+3.5°C)
17 +8°F (+4.0°C)

(♦... Factory setting)

Setting Description

More

Cooling

Less

Heating

Less

Cooling

More

Heating

Room temperature control for wired remote con­troller sensor

Depending on the installed environment, correction of the wire
remote temperature sensor may be required.
Select the appropriate control setting according to the in­stalled environment.
To change this setting, set Function 42 to Both "01", and
Function 48 to Wired remote controller "01".
Ensure that the Thermo Sensor icon is displayed on the re­mote controller screen.

(♦... Factory setting)

Function

number

92

(For

cooling)

heating)

93

(For

Setting

value

00 No correction 0.0°F (0.0°C) ♦
01 No correction 0.0°F (0.0°C)
02 -1°F (-0.5°C)
03 -2°F (-1.0°C)
04 -3°F (-1.5°C)
05 -4°F (-2.0°C)
06 -5°F (-2.5°C)
07 -6°F (-3.0°C)
08 -7°F (-3.5°C)
09 -8°F (-4.0°C)
10 +1°F (+0.5°C)
11 +2°F (+1.0°C)
12 +3°F (+1.5°C)
13 +4°F (+2.0°C)
14 +5°F (+2.5°C)
15 +6°F (+3.0°C)
16 +7°F (+3.5°C)
17 +8°F (+4.0°C)

Setting description

More

Cooling

Less

Heating

Less

Cooling

More

Heating

Setting record

Record any changes to the settings in the following table.



Setting Setting Value

Heat Insulation condition (building
insulation)

Room temperature control for in­door unit sensor

Room temperature control for wired
remote controller sensor

After completing the Function Setting, be sure to turn off the
power and turn it on again.

Cooling
Heating
Cooling
Heating

En-21

SETTING THE ROOM TEMPERATURE
DETECTION LOCATION

The location of the sensor detecting the room temperature
can be selected from the following 2 examples. Choose the
best location depending on the installing condition.
Refer to “10.3. Function setting”.

A. Indoor unit sensor setting (factory setting)

The room temperature is detected by the indoor unit tem­perature sensor. When using this function, the “Room tem­perature sensor switching (Function number: 42)” is set at
“Indoor unit (00)”

(1) When the THERMO SENSOR button is pressed, the lock

display fl ashes because the function is locked at the factory.

A

Indoor unit

F

F

(2) Fan delay setting (JM3)

It is a function to delay the stop of cooling fan when the air
conditioner is stopped.

(♦... Factory setting)

JM3 Fan Delay

Connect Invalid

♦

Disconnect Valid

• Switching position

Jumper wires

JM3

JM2

JM1

B. Indoor unit/remote controller sensor setting

The temperature sensor of both the indoor unit and the re­mote controller is used to detect the room temperature.
When using this function, the “Room temperature sensor
switching (Function number: 42)” is set at “Both (01)”

(1) Activate the sensor switching function as described in

“Room temperature sensor switching (Function number:

42).”

(2) Press the THERMO SENSOR button for 5 seconds or

more to select the temperature sensor of the indoor unit
or the remote controller.

B

Indoor unit

F

F

10.4. Jumper wire setting

(1) Drainage function setting (JM1)

If contained drain pump is not used, set the drainage function
to “Invalid” in the drainage function switching.

• If contained drain pump is not use:

When used under “WALL MOUNTED TYPE/FLOOR
STANDING CONCEALED TYPE”.
When used in natural drainage under “CEILING CON­CEALED TYPE”.

(♦... Factory setting)

JM1 Drainage Function

Connect Valid

♦

Disconnect Invalid

• JM2 setting forbidden

10.5. Test run

CAUTION

Always turn on the power 12 hours prior to the start of the
operation in order to ensure compressor protection.

CHECK ITEMS

(1)

Is operation of each button on the remote controller normal?
(2) Does each lamp light normally?
(3) Do the airfl ow direction louvers operate normally?
(4) Is the drain normal?
(5)

Is there any error noise and vibration during operation?

• Do not operate the air conditioner in test run for a long time.

[OPERATION METHOD]

• For the operation method, refer to the operating manual.
(1) Stop the air conditioner operation.
(2)

Press the MODE button and the FAN button simultane-

ously for 2 seconds or more to start the test run.

Test run display

(3) Press the START/STOP button to stop the test run.
If “C0” appears on the unit number display, there is a remote

controller error. Refer to the installation manual included with
the remote controller.

Unit Number Error Code Content

Incompatible indoor unit is
connected

Indoor unit  remote con­troller communication error

En-22

[Using the wireless remote controller for test
run] (Option)

• For the operation method, refer to the operating manual.

•

The outdoor unit may not operate depending on the room
temperature. In this case, press the test run button on the
wireless remote controller unit while the air conditioner is
running. (Point the transmitter section of the wireless remote
controller toward the air conditioner and press the test run
button with the tip of a ball-point pen and so on.)

Transmitter section

12. OPTIONAL PARTS

WARNING

Refer to local codes for acceptable cable type.

12.1. External input and external output

Connection methods

• Wire modifi cation
Remove insulation from wire attached to wire kit connector.

Remove insulation from fi eld supplied cable.
Use crimp type insulated butt connector to join fi eld cable and
wire kit wire.

Test run button

•

To end test operation, press the wireless remote controller
START/STOP button.

(When the air conditioner is run by pressing the test run

button, the OPERATION indicator lamp and TIMER indica­tor lamp will simultaneously fl ash slowly.)

11. SPECIAL INSTALLATION METHODS

CAUTION

When setting DIP switches, do not touch any other
parts on the circuit board directly with your bare
hands.

Be sure to turn off the main power.

DUAL REMOTE CONTROLLERS

• 2 separate remote controllers can be used to operate the
indoor units.

•

The timer and self-diagnosis functions cannot be used on
the secondary units.

(1) Wiring method (indoor unit to remote controller)

Indoor unit

Remote controller cable

Insulated connection

Cable (Field supply)

Output terminal (CN103)

Input No Voltage terminal
(CN102)

Option parts
External input/output wire

Primary unit

Remote controller

Secondary unit

(2) Remote controller DIP switch 1 setting
Set SW2 on the remote controller DIP switch 1 according

to the following table.

Number of Remote

Controllers

Primary Unit Secondary Unit

SW2 SW2

1 (Normal) OFF –

2 (Dual) OFF ON

Cable tie (Small)

(Accessories)

En-23

12.2. Remote sensor (Optional parts)

12.3. IR Receiver Unit (Optional parts)

Connection method

• Connection terminals

Remote sensor terminal (CN8)

• Wiring arrangement

Connection method

• Connection terminals

Receiver unit terminal (CN13)

• Wiring arrangement

Cable tie

Cable tie

• Remove the existing connector and replace it with the remote

sensor connector (ensure that the correct connector is used).

• The original connector should be insulated to ensure that it

does not come into contact with other electrical circuitry.

Setting for room temperature correction
When a remote sensor is connected, set the function setting

of indoor unit as follows.

• Set Function Number “30” (Room temperature control for
cooling) to “00” (Factory setting)

• Set Function Number “31” (Room temperature control for
heating) to “02”

• Use 7 pins for receiver unit cable.

•

At fi rst, connect the receiver unit cable to the Receiver unit
terminal (CN13).

Cable tie

Avoid covering the air inlet

Power supply
cable

Avoid touching the ceiling with the wiring

Ceiling

with the wiring.

Do not bind the power supply cable and other cables together.

En-24

13. ERROR CODES

If you use a wired remote controller, error codes will appear on the remote controller display. If you use a wireless remote con­troller, the lamps on the IR receiver unit will output error codes by way of blinking patterns. See the lamp blinking patterns and
error codes in the following table. An error display is displayed only during operation.

Error Display

Operation

Lamp

(green)

Timer
Lamp

(orange)

ECONOMY

Lamp

(green)

(1) (1)

(1) (2)

(1) (5)
(2) (1)
(2) (2)
(2) (3)

(2) (4)

(3) (2) Indoor unit
(3) (5) Indoor unit
(4) (1) Indoor unit
(4) (2) Indoor unit
(5) (1) Indoor unit
(5) (3) Indoor unit
(5) (15) Indoor unit
(6) (2) Outdoor unit
(6) (3) Outdoor unit

(6) (4) Outdoor unit

(6) (5) Outdoor unit
(6) (10) Outdoor unit
(7) (1) Outdoor unit
(7) (2) Outdoor unit

(7) (3) Outdoor unit

(7) (4) Outdoor unit
(7) (5) Outdoor unit
(7) (7) Outdoor unit

(8) (2) Outdoor unit

(8) (3) Outdoor unit
(8) (4) Outdoor unit

(8) (6) Outdoor unit

(9) (4) Outdoor unit

(9) (5) Outdoor unit

(9) (7) Outdoor unit

(9) (9) Outdoor unit
(10) (1)
(10) (3)
(10) (5)

(13) (2) Branch box

•Display mode : 0.5s ON / 0.5s OFF, ( ) : Number of fl ashing, : 0.1s ON / 0.1s OFF

Wired

Remote

Controller

Error Code

Mode DESCRIPTION Remark

•

Communication

Communication

Communication
Function setting
Function setting
Function setting

Function setting

Serial communication error
Remote controller communi-

cation error
Scan error

Initial setting error
Indoor unit capacity error
Connection disabled (series error)

Connection unit number er­ror

Indoor unit main PCB error
Manual auto switch error
Room error
Indoor unit Heat Ex. sensor error
Indoor unit fan motor 1 error
Water Drain error
Indoor unit error
Outdoor unit main PCB error
Inverter PCB error

Active fi lter error, PFC circuit
error

IPM error
Display panel error
Discharge thermistor error
Compressor thermistor error

Outdoor unit Heat Ex. Sen­sor error

Outdoor thermistor error
Suction Gas thermistor error
Heat sink thermistor error

Sub-cool Heat Ex. gas
thermistor error

Liquid pipe thermistor error
Current sensor error

Pressure sensor error

Trip detection
Compressor motor control

error
Outdoor unit fan motor 1 error

4-way valve error
Refrigerant system
Refrigerant system
Refrigerant system

Discharge temperature 1 error

Compressor temperature error

Pressure error 2

Unit fl ow divider error

When the indoor unit cannot receive the signal from the branch unit

•

When the branch unit cannot receive the signal from the indoor unit

•Wired remote controller communication error

•

Check operation incompletion error (normally, operation disabled)

•Wiring mistake

•Indoor unit capacity error

•Combination error

•Connection unit number error (indoor unit)

•Connection unit number error (branch unit)

•Indoor unit PCB Model information error

•Manual auto switch error

•Inlet thermistor error

•Indoor unit Heat Ex. Middle thermistor error

•Main fan motor lock error

•Main fan motor revolution speed error

•Drain pump error

•Indoor unit error

•Outdoor unit PCB Model information error

•Outdoor unit PCB microcomputer communication error

•Inverter error

•Voltage error stoppage permanently

•Voltage error (can restore)

•Over current protected operation stoppage permanently

•PFC hardware error

•Trip terminal L error

•Microcomputers communication error

•Discharge thermistor 1 error

•Compressor thermistor 1 error

•Outdoor unit Heat Ex. liquid thermistor error

•Outdoor thermistor error

•Suction Gas thermistor error

•Heat sink thermistor error

•Sub-cool Heat Ex. gas inlet thermistor error

•Sub-cool Heat Ex. gas outlet thermistor error

•Liquid pipe thermistor 1 error

•Current sensor 1 error (stoppage permanently)

•Discharge pressure sensor error

•Suction pressure sensor error

•High pressure switch 1 error

•Trip detection

•Rotor position detection error (stoppage permanently)

•Duty error

•4-way valve error

•Discharge temperature 1 error

•Compressor 1 temperature error

•Low pressure error

•EEPROM access error

•Equipment type information error

•Serial communication error to outdoor unit

•Branch units serial communication error

•Serial communication error to indoor unit

•Liquid pipe thermistor error

•Gas pipe thermistor error

•Expansion valve full closure operation error

•Remote controller communication error

•Branch unit error

En-25

[Troubleshooting at the remote controller LCD]

This is possible only on the wired remote controller.

[Self-diagnosis]

If an error occurs, the following display will be shown.
(“Er” will appear in the set room temperature display)

Error code

EX. Self-diagnosis

14. CUSTOMER GUIDANCE

Explain the following to the customer in accordance with the
operating manual:

(1) Starting and stopping method, operation switching,

temperature adjustment, timer, air fl ow switching, and other
remote controller unit operations.

(2) Air fi lter removal and cleaning, and how to use the air louvers.
(3) Give the operating manual to the customer.
(4) If the wireless remote controller custom code is changed from

A to B, C, or D, it will change back to A when the batteries in
the remote controller are replaced. Explain to the customer
how to program the wireless remote controller for the correct
custom code.

En-26