Toshiba RAV-RM301KRTP-E, RAV-RM401KRTP-E Installation Manual

Installation Manual

Indoor Unit

High-Wall Type

Model name:

RAV-RM301KRTP-E
RAV-RM401KRTP-E

R32 or R410A

Installation Manual 1

English

For commercial use

Installation Manual

‒ 1 ‒

1-EN

Please read this Installation Manual carefully before installing the Air Conditioner.

• This Manual describes the installation method of the indoor unit.

• For installation of the outdoor unit, follow the Installation Manual attached to the outdoor unit.

• For precaution for safety, follow the Installation Manual attached to the outdoor unit.

ADOPTION OF R32 or R410A REFRIGERANT

This Air Conditioner has adopted a refrigerant HFC (R32 or R410A) which does not destroy the
ozone layer.
Be sure to check the refrigerant type for outdoor unit to be combined, and then install it.

Contents

1 PRECAUTIONS FOR SAFETY .............................................. 5

2 ACCESSORY PARTS ..................................................... 11

3 SELECTION OF INSTALLATION PLACE ................................... 12

4 INSTALLATION OF INDOOR UNIT ......................................... 15

5 CUTTING A HOLE AND MOUNTING INSTALLATION PLATE ................. 16

6 PIPING AND DRAIN HOSE INSTALLATION ................................. 17

7 INDOOR UNIT FIXING ..................................................... 21

8 DRAINAGE ............................................................... 21

9 REFRIGERANT PIPING ................................................... 22

10 ELECTRICAL CONNECTION .............................................. 25

11 APPLICABLE CONTROLS ................................................ 30

12 TEST RUN ................................................................ 42

13 MAINTENANCE ........................................................... 44

14 TROUBLESHOOTING ..................................................... 46

Installation Manual

‒ 2 ‒

2-EN

Thank you for purchasing this Toshiba air conditioner.
Please read carefully through these instructions that contain important information which complies with
the Machinery Directive (Directive 2006/42/EC), and ensure that you understand them.
After completing the installation work, hand over this Installation Manual as well as the Owner’s Manual
provided to the user, and ask the user to keep them in a safe place for future reference.

Generic Denomination: Air Conditioner

Definition of Qualified Installer or Qualified Service Person

The air conditioner must be installed, maintained, repaired and removed by a qualified installer or qualified
service person. When any of these jobs is to be done, ask a qualified installer or qualified service person
to do them for you.
A qualified installer or qualified service person is an agent who has the qualifications and knowledge
described in the table below.

Agent Qualifications and knowledge which the agent must have

Qualified
installer

• The qualified installer is a person who installs, maintains, relocates and removes the air
conditioners made by Toshiba Carrier Corporation. He or she has been trained to install,
maintain, relocate and remove the air conditioners made by Toshiba Carrier Corporation or,
alternatively, he or she has been instructed in such operations by an individual or individuals
who have been trained and is thus thoroughly acquainted with the knowledge related to these
operations.

• The qualified installer who is allowed to do the electrical work involved in installation, relocation
and removal has the qualifications pertaining to this electrical work as stipulated by the local
laws and regulations, and he or she is a person who has been trained in matters relating to
electrical work on the air conditioners made by Toshiba Carrier Corporation or, alternatively,
he or she has been instructed in such matters by an individual or individuals who have been
trained and is thus thoroughly acquainted with the knowledge related to this work.

• The qualified installer who is allowed to do the refrigerant handling and piping work involved
in installation, relocation and removal has the qualifications pertaining to this refrigerant
handling and piping work as stipulated by the local laws and regulations, and he or she is a
person who has been trained in matters relating to refrigerant handling and piping work on
the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been
instructed in such matters by an individual or individuals who have been trained and is thus
thoroughly acquainted with the knowledge related to this work.

• The qualified installer who is allowed to work at heights has been trained in matters relating
to working at heights with the air conditioners made by Toshiba Carrier Corporation or,
alternatively, he or she has been instructed in such matters by an individual or individuals who
have been trained and is thus thoroughly acquainted with the knowledge related to this work.

Qualified
service person

• The qualified service person is a person who installs, repairs, maintains, relocates and removes
the air conditioners made by Toshiba Carrier Corporation. He or she has been trained to install,
repair, maintain, relocate and remove the air conditioners made by Toshiba Carrier Corporation
or, alternatively, he or she has been instructed in such operations by an individual or individuals
who have been trained and is thus thoroughly acquainted with the knowledge related to these
operations.

• The qualified service person who is allowed to do the electrical work involved in installation,
repair, relocation and removal has the qualifications pertaining to this electrical work as
stipulated by the local laws and regulations, and he or she is a person who has been trained in
matters relating to electrical work on the air conditioners made by Toshiba Carrier Corporation
or, alternatively, he or she has been instructed in such matters by an individual or individuals
who have been trained and is thus thoroughly acquainted with the knowledge related to this
work.

• The qualified service person who is allowed to do the refrigerant handling and piping work
involved in installation, repair, relocation and removal has the qualifications pertaining to this
refrigerant handling and piping work as stipulated by the local laws and regulations, and he or
she is a person who has been trained in matters relating to refrigerant handling and piping work
on the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has
been instructed in such matters by an individual or individuals who have been trained and is
thus thoroughly acquainted with the knowledge related to this work.

• The qualified service person who is allowed to work at heights has been trained in matters
relating to working at heights with the air conditioners made by Toshiba Carrier Corporation or,
alternatively, he or she has been instructed in such matters by an individual or individuals who
have been trained and is thus thoroughly acquainted with the knowledge related to this work.

Installation Manual

‒ 3 ‒

3-EN

Definition of Protective Gear

When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective
gloves and ‘safety’ work clothing.
In addition to such normal protective gear, wear the protective gear described below when undertaking
the special work detailed in the table below.
Failure to wear the proper protective gear is dangerous because you will be more susceptible to injury,
burns, electric shocks and other injuries.

Work undertaken Protective gear worn

All types of work

Protective gloves
‘Safety’ working clothing

Electrical-related work

Gloves to provide protection for electricians and from heat
Insulating shoes
Clothing to provide protection from electric shock

Work done at heights
(50 cm or more)

Helmets for use in industry

Transportation of heavy objects Shoes with additional protective toe cap

Repair of outdoor unit Gloves to provide protection for electricians and from heat

These safety cautions describe important matters concerning safety to prevent injury to users or other
people and damages to property. Please read through this manual after understanding the contents
below (meanings of indications), and be sure to follow the description.

Indication Meaning of Indication

WARNING

Text set off in this manner indicates that failure to adhere to the directions in the warning could
result in serious bodily harm (*1) or loss of life if the product is handled improperly.

CAUTION

Text set off in this manner indicates that failure to adhere to the directions in the caution could
result in slight injury (*2) or damage (*3) to property if the product is handled improperly.

*1: Serious bodily harm indicates loss of eyesight, injury, burns, electric shock, bone fracture, poisoning,

and other injuries which leave aftereffect and require hospitalization or long-term treatment as an
outpatient.

*2: Slight injury indicates injury, burns, electric shock, and other injuries which do not require hospitalization

or long-term treatment as an outpatient.

*3: Damage to property indicates damage extending to buildings, household effects, domestic livestock,

and pets.

MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT

WARNING

(Risk of fire)

This mark is for R32 refrigerant only. Refrigerant type is written on nameplate
of outdoor unit.
In case that refrigerant type is R32, this unit uses a flammable refrigerant.
If refrigerant leaks and comes in contact with fire or heating part, it will create
harmful gas and there is risk of fire.

Read the OWNER’S MANUAL carefully before operation.

Service personnel are required to carefully read the OWNER’S MANUAL and INSTALLATION
MANUAL before operation.

Further information is available in the OWNER’S MANUAL, INSTALLATION MANUAL, and the
like.

Installation Manual

‒ 4 ‒

4-EN



Warning indications on the air conditioner unit

Warning indication Description

WARNING

ELECTRICAL SHOCK HAZARD

Disconnect all remote
electric power supplies
before servicing.

WARNING

ELECTRICAL SHOCK HAZARD

Disconnect all remote electric power supplies before servicing.

WARNING

Moving parts.
Do not operate unit with grille
removed.
Stop the unit before the servicing.

WARNING

Moving parts.
Do not operate unit with grille removed.
Stop the unit before the servicing.

CAUTION

High temperature parts.
You might get burned
when removing this panel.

CAUTION

High temperature parts.
You might get burned when removing this panel.

CAUTION

Do not touch the aluminum
fins of the unit.
Doing so may result in injury.

CAUTION

Do not touch the aluminium fi ns of the unit.
Doing so may result in injury.

CAUTION

BURST HAZARD

Open the service valves before
the operation, otherwise there
might be the burst.

CAUTION

BURST HAZARD

Open the service valves before the operation, otherwise there might be
the burst.

Installation Manual

‒ 5 ‒

5-EN

1 PRECAUTIONS FOR SAFETY

• Ensure that all Local, National and International regulations are satisfied.

• Read this “PRECAUTIONS FOR SAFETY” carefully before Installation.

• The precautions described below include the important items regarding
safety. Observe them without fail.

• After the installation work, perform a trial operation (test run) to check for any
problem.

Follow the Owner’s Manual to explain how to use and maintain the unit to

the customer.

• Turn off the main power supply switch (or breaker) before the unit
maintenance.

• Ask the customer to keep the Installation Manual together with the Owner’s
Manual.

The manufacturer shall not assume any liability for the damage caused by not
observing the description of this manual.

WARNING

General

• Before starting to install the air conditioner, read through the Installation
Manual carefully, and follow its instructions to install the air conditioner.

• Only a qualified installer(*1) or qualified service person(*1) is allowed to
do installation work. Inappropriate installation may result in water leakage,
electric shock or fire.

• Do not use any refrigerant different from the one specifled for complement or
replacement. Otherwise, abnormally high pressure may be generated in the
refrigeration cycle, which may result in a failure or explosion of the product or
an injury to your body.

• Before opening the front panel of the indoor unit or service panel of the
outdoor unit, set the circuit breaker to the OFF position. Failure to set the
circuit breaker to the OFF position may result in electric shocks through
contact with the interior parts. Only a qualified installer(*1) or qualified
service person(*1) is allowed to remove the front panel of the indoor unit or
service panel of the outdoor unit and do the work required.

• Before carrying out the installation, maintenance, repair or removal work, be
sure to set the circuit breaker to the OFF position. Otherwise, electric shocks
may result.

• Place a “Work in progress” sign near the circuit breaker while the installation,
maintenance, repair or removal work is being carried out. There is a danger
of electric shocks if the circuit breaker is set to ON by mistake.

Installation Manual

‒ 6 ‒

6-EN

• Only a qualified installer(*1) or qualified service person(*1) is allowed to
undertake work at heights using a stand of 50 cm or more or to remove the
front panel of the indoor unit to undertake work.

• Wear protective gloves and safety work clothing during installation, servicing
and removal.

• Do not touch the aluminium fin of the unit. You may injure yourself if you do
so. If the fin must be touched for some reason, first put on protective gloves
and safety work clothing, and then proceed.

• Do not climb onto or place objects on top of the outdoor unit. You may fall or
the objects may fall off of the outdoor unit and result in injury.

• When work is performed at heights, use a ladder which complies with the
ISO 14122 standard, and follow the procedure in the ladder’s instructions.
Also wear a helmet for use in industry as protective gear to undertake the
work.

• Before cleaning the filter or other parts of the outdoor unit, set the circuit
breaker to OFF without fail, and place a “Work in progress” sign near the
circuit breaker before proceeding with the work.

• Before working at heights, put a sign in place so that no-one will approach
the work location, before proceeding with the work. Parts and other objects
may fall from above, possibly injuring a person below. While carrying out the
work, wear a helmet for protection from falling objects.

• Do not use the refrigerant other than R32 or R410A.

For the refrigerant type, check the outdoor unit to be combined.

• The refrigerant used by this air conditioner, follow to the outdoor unit.

• The air conditioner must be transported in stable condition. If any part of the
product is broken, contact the dealer.

• When the air conditioner must be transported by hand, carry it by two or
more people.

• Do not move or repair any unit by yourself. There is high voltage inside the
unit. You may get electric shock while removing the cover and main unit.

• This appliance is intended to be used by expert or trained users in shops, in
light industry, or for commercial use by lay persons.

Selection of installation location

• When the air conditioner is installed in a small room, provide appropriate
measures to ensure that the concentration of refrigerant leakage occur in the
room does not exceed the critical level.

• Do not install the air conditioner in a location that may be subject to a risk
of exposure to a combustible gas. If a combustible gas leaks and becomes
concentrated around the unit, a fire may occur.

• To transport the air conditioner, wear shoes with additional protective toe
caps.

Installation Manual

‒ 7 ‒

7-EN

• To transport the air conditioner, do not take hold of the bands around the
packing carton. You may injure yourself if the bands should break.

• Do not place any combustion appliance in a place where it is directly
exposed to the wind of air conditioner, otherwise it may cause imperfect
combustion.

• Do not install in a location where flammable gas leaks are possible. If the
gas leak and accumulate around the unit, it may ignite and cause a fire.

• Install the indoor unit at least 2.5 m above the floor level since otherwise
the users may injure themselves or receive electric shocks if they poke
their fingers or other objects into the indoor unit while the air conditioner is
running.

• Appliance and pipe-work shall be installed, operated and stored in a room
with a floor area larger than A

min

m2.

How to get A

min

m2: A

min

= (M / (2.5 × 0.22759 × h0))

2

M is the refrigerant charge amount in appliance in kg;
h0 is the installation height of the appliance in m:

0.6 m for floor standing / 1.8 m for wall mounted / 1.0 m for window mounted
/ 2.2 m for ceiling mounted.

(R32 refrigerant models only. For detail, refer to Installation Manual of the

outdoor unit.)

Installation

• Install the air conditioner securely in a location where the base can sustain
the weight adequately. If the strength is not enough, the unit may fall down
resulting in injury.

• Follow the instructions in the Installation Manual to install the air conditioner.
Failure to follow these instructions may cause the product to fall down or
topple over or give rise to noise, vibration, water leakage or other trouble.

• Carry out the specied installation work to guard against the possibility of high
winds and earthquake. If the air conditioner is not installed appropriately, a
unit may topple over or fall down, causing an accident.

• If refrigerant gas has leaked during the installation work, ventilate the room
immediately. If the leaked refrigerant gas comes in contact with fire, noxious
gas may generate.

• Use forklift to carry in the air conditioner units and use winch or hoist at
installation of them.

Installation Manual

‒ 8 ‒

8-EN

Refrigerant piping

• Install the refrigerant pipe securely during the installation work before
operating the air conditioner. If the compressor is operated with the valve
open and without refrigerant pipe, the compressor sucks air and the
refrigeration cycles is over pressurized, which may cause a injury.

• Tighten the flare nut with a torque wrench in the specified manner. Excessive
tighten of the flare nut may cause a crack in the flare nut after a long period,
which may result in refrigerant leakage.

• After the installation work, confirm that refrigerant gas does not leak. If
refrigerant gas leaks into the room and flows near a fire source, such as a
cooking range, noxious gas may be generated.

• When the air conditioner has been installed or relocated, follow the
instructions in the Installation Manual and purge the air completely so that no
gases other than the refrigerant will be mixed in the refrigerating cycle.

Failure to purge the air completely may cause the air conditioner to

malfunction.

• Nitrogen gas must be used for the airtight test.

• The charge hose must be connected in such a way that it is not slack.

Electrical wiring

• Only a qualified installer(*1) or qualified service person(*1) is allowed to
carry out the electrical work of the air conditioner. Under no circumstances
must this work be done by an unqualified individual since failure to carry out
the work properly may result in electric shocks and/or electrical leaks.

• To connect the electrical wires, repair the electrical parts or undertake
other electrical jobs, wear gloves to provide protection for electricians and
from heat, insulating shoes and clothing to provide protection from electric
shocks. Failure to wear this protective gear may result in electric shocks.

• Use wiring that meets the specifications in the Installation Manual and the
stipulations in the local regulations and laws. Use of wiring which does not
meet the specifications may give rise to electric shocks, electrical leakage,
smoking and/or a fire.

• Connect earth wire. (grounding work)

Incomplete grounding causes an electric shock.

• Do not connect earth wires to gas pipes, water pipes, and lightning
conductor or telephone earth wires.

• After completing the repair or relocation work, check that the earth wires are
connected properly.

• Install a circuit breaker that meets the specifications in the installation
manual and the stipulations in the local regulations and laws.

• Install the circuit breaker where it can be easily accessed by the agent.

• When installing the circuit breaker outdoors, install one which is designed to
be used outdoors.

Installation Manual

‒ 9 ‒

9-EN

• Under no circumstances the power wire must not be extended. Connection
trouble in the places where the wire is extended may give rise to smoking
and/or a fire.

• Electrical wiring work shall be conducted according to law and regulation
in the community and installation manual. Failure to do so may result in
electrocution or short circuit.

Test run

• Before operating the air conditioner after having completed the work, check
that the electrical control box cover of the indoor unit and service panel of
the outdoor unit are closed, and set the circuit breaker to the ON position.
You may receive an electric shock if the power is turned on without first
conducting these checks.

• If there is any kind of trouble (such as an error display has appeared, smell
of burning, abnormal sounds, the air conditioner fails to cool or heat or
water is leaking) has occurred in the air conditioner, do not touch the air
conditioner yourself but set the circuit breaker to the OFF position, and
contact a qualified service person. Take steps to ensure that the power will
not be turned on (by marking “out of service” near the circuit breaker, for
instance) until qualified service person(*1) arrives. Continuing to use the air
conditioner in the trouble status may cause mechanical problems to escalate
or result in electric shocks or other trouble.

• After the work has finished, use an insulation tester set (500 V Megger) to
check the resistance is 1 MΩ or more between the charge section and the
non-charge metal section (earth section). If the resistance value is low, a
disaster such as a leak or electric shock is caused at user’s side.

• Upon completion of the installation work, check for refrigerant leaks and
check the insulation resistance and water drainage. Then conduct a test run
to check that the air conditioner is operating properly.

Explanations given to user

• Upon completion of the installation work, tell the user where the circuit
breaker is located. If the user does not know where the circuit breaker is, he
or she will not be able to turn it off in the event that trouble has occurred in
the air conditioner.

• If the fan grille is damaged, do not approach the outdoor unit but set the
circuit breaker to the OFF position, and contact a qualified service person(*1)
to have the repairs done. Do not set the circuit breaker to the ON position
until the repairs are completed.

• After the installation work, follow the Owner’s Manual to explain to the
customer how to use and maintain the unit.

Installation Manual

‒ 10 ‒

10-EN

Relocation

• Only a qualified installer(*1) or qualified service person(*1) is allowed to
relocate the air conditioner. It is dangerous for the air conditioner to be
relocated by an unqualified individual since a fire, electric shocks, injury,
water leakage, noise and/or vibration may result.

• While carrying out the pump-down work shut down the compressor before
disconnecting the refrigerant pipe. Disconnecting the refrigerant pipe with
the service valve left open and the compressor still operating will cause air or
other gas to be sucked in, raising the pressure inside the refrigeration cycle
to an abnormally high level, and possibly resulting in rupture, injury or other
trouble.

CAUTION

This Air Conditioner has adopted a refrigerant HFC (R32 or R410A) which
does not destroy the ozone layer.

• As the R32 or R410A refrigerant is easily affected by impurities such as
moisture, oxidized film, oil, etc., due to the high pressure, be careful not to
allow the moisture, dirt, existing refrigerant, refrigerating machine oil, etc., to
get mixed up in the refrigeration cycle during the installation work.

• A special tool for the R32 or R410A refrigerant is required for installation.

• Use a new and clean piping materials for the connecting pipe so that
moisture and dirt are not mixed together during the installation work.

• When using existing pipes, follow the installation manual enclosed with the
outdoor unit.

To disconnect the appliance from main power supply.

• This appliance must be connected to the main power supply by means of a
switch with a contact separation of at least 3 mm.

The installation fuse (all types can be used) must be used for the power
supply line of this air conditioner.

Install the indoor unit at least 2.5 m above the floor level since otherwise
the users may injure themselves or receive electric shocks if they poke
their fingers or other objects into the indoor unit while the air conditioner
is running.

(*1) Refer to the “Definition of Qualified Installer or Qualified Service Person.”

Installation Manual

‒ 11 ‒

11-EN

2 ACCESSORY PARTS

Part name Q’ty Shape Usage

Installation Manual 1 This manual

(Hand over to customers)
(For other languages that do not appear in
this installation Manual, please refer to the
enclosed CD-R.)

Owner’s Manual 1

(Hand over to customers)
(For other languages that do not appear in
this installation Manual, please refer to the
enclosed CD-R.)

CD-ROM 1 − Owner’s Manual and Installation Manual.

Installation plate 1

Wireless remote controller 1

Battery 2

Remote controller holder 1

Mounting screw Ø4 × 25R 6

Flat head wood screw Ø3.1 × 16R 2

Heat insulator 1

Installation Manual

‒ 12 ‒

12-EN

3 SELECTION OF INSTALLATION PLACE

WARNING

• Install the air conditioner at enough strong place to withstand the weight of the unit.
If the strength is not enough, the unit may fall down resulting in injury.

CAUTION

• Do not install the air conditioner in a location subject to a risk of exposure to a combustible

gas.

If a combustible gas leaks and stays around the unit, a fire may occur.

Upon approval of the customer, install the air conditioner in a place that satisfies the following
conditions.

• Place where the unit can be installed horizontally.

• Place where a sufficient servicing space can be ensured for safety maintenance and check.

• Place where drained water will not cause any problem.

Avoid installing in the following places.

Select a location for the indoor unit where the cool or warm air will circulate evenly.
Avoid installation in the following kinds of locations.

• Saline area (coastal area).

• Locations with acidic or alkaline atmospheres (such as areas with hot springs, factories where
chemicals or pharmaceuticals are made and places where the exhaust air from combustion appliances
will be sucked into the unit).

Doing so may cause the heat exchanger (its aluminum fins and copper pipes) and other parts to

become corroded.

• Locations with atmospheres with mist of cutting oil or other types of machine oil.

Doing so may cause the heat exchanger to become corroded, mists caused by the blockage of the

heat exchanger to be generated, the plastic parts to be damaged, the heat insulators to peel off, and
other such problems to result.

• Places where iron or other metal dust is present. If iron or other metal dust adheres to or collects on
the interior of the air conditioner, it may spontaneously combust and start a fire.

• Locations where vapors from food oils are formed (such as kitchens where food oils are used).

Blocked filters may cause the air conditioner’s performance to deteriorate, condensation to form, the

plastic parts to be damaged, and other such problems to result.

• Locations near obstructions such as ventilation openings or lighting fixtures where the flow of the
blown air will be disrupted (a disruption of the air flow may cause the air conditioner’s performance to
deteriorate or the unit to shut down).

• Locations where an in-house power generator is used for the power supply.

The power line frequency and voltage may fluctuate, and the air conditioner may not work properly as a

result.

• On truck cranes, ships or other moving conveyances.

• The air conditioner must not be used for special applications (such as for storing food, plants, precision
instruments or art works).

(The quality of the items stored may be degraded.)

• Locations where high frequencies are generated (by inverter equipment, in-house power generators,
medical equipment or communication equipment).

(Malfunctioning or control trouble in the air conditioner or noise may adversely affect the equipment’s

operation.)

• Locations where there is anything under the unit installed that would be compromised by wetness.

(If the drain has become blocked or when the humidity is over 80 %, condensation from the indoor unit

will drip, possibly causing damage to anything underneath.)

• In the case of the wireless type of system, rooms with the inverter type of fluorescent lighting or
locations exposed to direct sunlight.

(The signals from the wireless remote controller may not be sensed.)

• Locations where organic solvents are being used.

• The air conditioner cannot be used for liqueed carbonic acid cooling or in chemical plants.

• Location near doors or windows where the air conditioner may come into contact with high-temperature,
high-humidity outdoor air.

(Condensation may occur as a result.)

• Locations where special sprays are used frequently.

Installation Manual

‒ 13 ‒

13-EN

65 mm or more

300 mm or more

300 mm or more

Shield pipe

Hook

Installation
plate

Air fi lter

(Attach to the front

panel.)

Hook

*1

*2



Installation diagram of Indoor and outdoor units

The auxiliary piping can be connected
to the left, rear left, rear right, right,
bottom right or bottom left.

Right

Rear right

Bottom
right

Rear
left

Bottom left

Left

Insulate the refrigerant pipes
separately with insulation, not together.

6 mm thick heat resisting
polyethylene foam

Insert the cushion between the
indoor unit and wall, and tilt the
indoor unit for better operation.

For the rear left and left piping

Wall

Make sure to run the drain hose
sloped downward.

Do not allow the drain hose to get
slack.

Cut the piping
hole sloped
slightly.

Batteries

Wireless
remote controller

Remote control holder

Flat head
wood screw

Refrigerant piping
must be protected from
physical damage.
Install a plastic cover
or equivalent.

Before installing the wireless remote controller

1. Remove the battery cover.

2. Insert 2 new batteries (R03 [AAA] type) following
the (+) and (−) positions.

Wireless remote controller

Cover

Batteries

Installation Manual

‒ 14 ‒

14-EN



Installation space

The indoor unit shall be installed so that its top surface comes at a height of 2.5 m or more.
Also it must be avoided to put anything on top of the indoor unit.

*1 Reserve space required to install the indoor unit and for service work.

Keep 65 mm or more for clearance between top plate of the indoor unit and the ceiling surface.

*2 Provide a space as shown for service clearance for the cross flow fan.



Installation place

• A place which provides the spaces around the indoor unit as shown in the above diagram.

• A place where there is no obstacle near the air inlet and outlet.

• A place that allows easy installation of the piping to the outdoor unit.

• A place which allows the front panel to be opened.

CAUTION

• Direct sunlight to the indoor unit’s wireless receiver should be avoided.

• The microprocessor in the indoor unit should not be too close to RF noise sources.
(For details, see the owner’s manual.)



Wireless remote controller

• A place where there are no obstacles such as a curtain that may block the signal from the indoor unit.

• Do not install the remote controller in a place exposed to direct sunlight or close to a heating source,
such as a stove.

• Keep the remote controller at least 1m apart from the nearest TV set or stereo equipment.

(This is necessary to prevent image disturb-bounces or noise interference.)

• The location of the remote controller should be determined as shown below.

Indoor unit

(Side view) (Top view)

Indoor unit

Reception
range

Remote controller

Reception range

Remote controller

* : Axial distance

* 7 m

7 m

75°

45°

45°

5 m

5 m

Installation Manual

‒ 15 ‒

15-EN

4 INSTALLATION OF INDOOR UNIT

WARNING

Install the air conditioner certainly to sufficiently withstand the weight.
If the strength is insufficient, the unit may fall down resulting in human injury.
Perform a specified installation work to guard against strong wind or earthquake.
An incomplete installation can cause accidents by the units falling and dropping.

REQUIREMENT

Strictly comply with the following rules to prevent damage of the indoor units and human injury.

• Do not put a heavy article on the indoor unit. (Even units are packaged)

• Carry in the indoor unit as it is packaged if possible. If carrying in the indoor unit unpacked by
necessity, be sure to use buffering cloth, etc. to not damage the unit.

• To move the indoor unit, do not apply force to the refrigerant pipe, drain pan, foamed parts, or resin
parts, etc.

• Carry the package by two or more persons, and do not bundle it with plastic band at positions other
than specified.

Be careful to the following items when installating the unit.

• Considering air discharge direction, select an installation place where discharge air can circulate evenly
in a room. Avoid to install the unit at place with “NO GOOD” mark in the right figure.

Bad installation place

: Not cooled well.

Good installation place
Cooled well all over.

Screen

NO GOODOK

Installation Manual

‒ 16 ‒

16-EN

5

CUTTING A HOLE AND MOUNTING INSTALLATION
PLATE



Cutting a hole

In case of installing the refrigerant pipes from the
rear:

1. Decide the hole position for piping at

120 mm from the arrow mark (Ö) on the
installation plate and drill a hole at a slight
downward slant toward outdoor side.

The center of the pipe
hole is above the arrow.

120 mm

Ø65 mm

Pipe hole

NOTE

• When drilling a wall that contains a metal lath,
wire lath or metal plate, be sure to use a pipe
hole brim ring sold separately.



Mounting the installation plate

144

50

50

300

65

103

300

Pipe hole

Indoor unit

Hook

Hook

Thread

Weight

Pipe hole

Hook

Installation
plate

Mounting screw



When the installation plate is
directly mounted on the wall

1. Securely fit the installation plate onto the
wall by screwing it in the upper and lower
parts to hook up the indoor unit.

2. To mount the installation plate on a
concrete wall with anchor bolts, utilize
the anchor bolt holes as illustrated in the
above figure.

3. Install the installation plate horizontally in
the wall.

CAUTION

When installing the installation plate with a
mounting screw, do not use the anchor bolt
hole. Otherwise the unit may fall down and
result in personal injury and property damage.

5 mm dia. hole

Clip anchor
(local parts)

Mounting screw
4 × 25R

Anchor bolt

Projection
15 mm or less

NO

GOOD

NO

GOOD

OK

CAUTION

Failure to firmly install the unit may result in
personal injury and property damage if the unit
falls.

• In case of block, brick, concrete or similar type

walls, make 5 mm dia. holes in the wall.

• Insert clip anchors for appropriate mounting

screws.

NOTE

• Secure four corners and lower parts of the
installation plate with 6 mounting screws to
install it.

Installation Manual

‒ 17 ‒

17-EN

6

PIPING AND DRAIN HOSE INSTALLATION



Piping and drain hose forming

* Apply heat-insulation for both refrigerant pipe and drain hose surely so that no dew generates inside of

the equipment. (Use polyethylene foam for insulating material.)

Rear right

Rear left

Bottom left

Left

Bottom right

Right

Die-cutting

back body slit

Piping preparation

Changing

drain hose

1. Die-cutting back body slit

Cut out the slit on the left or right side of the back body for the left or right connection and the slit on the
bottom left or right side of the back body for the bottom left or right connection with a pair of nippers.

2. Changing drain hose

For leftward connection, bottom-leftward connection and rear leftward connection’s piping, it is necessary
to change the drain hose and drain cap.
Without changing the drain hose position, the indoor unit will not fit to the wall.

How to remove the drain hose

• The drain hose can be removed by removing the screw securing the drain
hose and then pulling out the drain hose.

• When removing the drain hose, be careful of any sharp edges of steel plate.
The edges can injuries.

• To install the drain hose, insert the drain hose firmly until the connection part
contacts with heat insulator, and then secure it with original screw.

Drain hose

Installation Manual

‒ 18 ‒

18-EN

How to remove the drains cap

Clip the drain cap by needle-nose pliers and pull out.

How to fix the drains cap

1) Insert hexagonal wrench (dia. 4 mm) in a centre head.

2) Firmly insert drains cap.

No gap

Insert a hexagon
wrench (4 mm)

Do not apply lubricating oil
(refrigerant machine oil) when
inserting the drain cap. Application
causes deterioration and drain
leakage from the plug.

CAUTION

Firmly insert the drain hose and drain cap; otherwise, water may leak.

How to remove the drain hose

1) Remove the front panel.

2) Remove the screws of drain hose.

3) Pull out the drain hose.

How to fix the drain hose

1) Put the drain hose.

2) Screw the drain hose to the indoor unit.

3) Install the front panel.

q In case of right or left piping

• After scribing slits of the front panel with a knife or a marking-off pin, cut them with a pair of nippers or
an equivalent tool.

Slit

Installation Manual

‒ 19 ‒

19-EN

q In case of bottom right or bottom left piping

• After scribing slits of the front panel with a knife or a marking-off
pin, cut them with a pair of nippers or an equivalent tool.

Slit

q Left-hand connection with piping

Bend the connecting pipe so that it is laid within 43 mm above the wall surface. If the connecting pipe
is laid exceeding 43 mm above the wall surface, the indoor unit may unstably be set on the wall. When
bending the connecting pipe, make sure to use a spring bender so as not to crush the pipe.

Bend the connecting pipe within a radius of 30 mm.

To connect the pipe after installation of the unit (figure)

260 mm

210 mm

43 mm

Liquid side

Gas side

(To the forefront of fl are)

Outward form of indoor unit

R 30 mm (Use polisin (polyethylene)
core or the like for bending pipe.)

Use the handle of screwdriver, etc.

80°

NOTE

If the pipe is bent incorrectly, the indoor unit may unstably be set on the wall.
After passing the connecting pipe through the pipe hole, connect the connecting pipe to the auxiliary
pipes and wrap the facing tape around them.

Installation Manual

‒ 20 ‒

20-EN

A

A

10

Heat insulator provided

Gas side

Indoor unit shield pipe

Liquid side

Cut the heat insulator of the gas pipe
(locally procured) leaving a 10 mm
overlap with the shield of the shield pipe.

Heat insulator wrapping cross section A-A

Make the slit part of heat insulator to upward.

▼ Insulating the pipes

Insulate the indoor unit completely so there are no gaps using the heat insulator provided.

CAUTION

Securely apply insulation all the way up to the pipe connecting section of the indoor unit so that there
is no exposed area. (the pipe exposed to the outside causes water leak.)
When wrapping the heat insulator around pipes, make sure the slit aperture toward the ceiling surface.

CAUTION

• Bind the auxiliary pipes (two) and power supply wiring and control wiring with facing tape tightly. In
case of leftward piping and rear leftward piping, bind the auxiliary pipes (two) only with facing tape.

Indoor unit

Power supply wiring

Control wiring

Auxiliary pipes

Installation plate

• Carefully arrange pipes so that any pipe does not stick out of the rear plate of the indoor unit.

• Carefully connect the auxiliary pipes and connecting pipes to one another and cut off the insulating
tape wound on the connecting pipe to avoid double-taping at the joint; moreover, seal the joint with
the vinyl tape, etc.

• Since dew results in a machine trouble, make sure to insulate both the connecting pipes.
(Use polyethylene foam as insulating material.)

• When bending a pipe, carefully do it, not to crush it.

Installation Manual

‒ 21 ‒

21-EN

7

INDOOR UNIT FIXING

8

DRAINAGE

1. Pass the pipe through the hole in the wall,
and hook the indoor unit on the installation
plate at the upper hooks.

2. Swing the indoor unit to right and left to
confirm that it is firmly hooked up on the
installation plate.

3. While pressing the indoor unit onto the
wall, hook it at the lower part on the
installation plate. Pull the indoor unit
toward you to confirm that it is firmly
hooked up on the installation plate.

1

2

Installation plate

Hook here.

Hook

Press

(unhook)

• For detaching the indoor unit from the

installation plate, pull the indoor unit toward
you while pushing its bottom up at the specified
parts.

Push

Push

1. Run the drain hose sloped downwards.

NOTE

• Hole should be made at a slight downward
slant on the outdoor side.

2. Put water in the drain pan and make sure
that the water is drained out of doors.

3. When connecting extension drain hose,
insulate the connecting part of extension
drain hose with shield pipe.

50 mm
or more

Do not rise the drain hose.

Do not form the drain hose
into a wavy shape.

Do not put the
drain hose end
into water.

Do not put the
drain hose end
in the drainage
ditch.

Drain hose

Extension drain hose

Inside the
room

Shield pipe

CAUTION

Arrange the drain pipe for proper drainage from
the unit.
Improper drainage can result in dew-dropping.

This air conditioner has the structure designed to
drain water collected from dew, which forms on
the back of the indoor unit, to the drain pan.
Therefore, do not store the power cord and other
parts at a height above the drain guide.

Wall

Wall

Space for pipes

Drain guide

Installation Manual

‒ 22 ‒

22-EN

9

REFRIGERANT PIPING



Refrigerant Piping

1. Use copper pipe with 0.8 mm or more
thickness. (In case pipe size is dia. 15.9,

with 1.0 mm or more.)

2. Flare nut and flare works are also different
from those of the conventional refrigerant.
Take out the flare nut attached to the main
unit of the air conditioner, and use it.

REQUIREMENT

When the refrigerant pipe is long, provide
support brackets at intervals of 2.5 to 3 m to
clamp the refrigerant pipe. Otherwise, abnormal
sound may be generated.

CAUTION

IMPORTANT 4 POINTS FOR PIPING WORK

1. Reusable mechanical connectors and
flared joints are not allowed indoors. When
mechanical connectors are reused indoors,
sealing parts shall be renewed. When flared
joints are reused indoors, the flare part shall
be refabricated.

2. Tight connection (between pipes and unit)

3. Evacuate the air in the connecting pipes by
using VACUUM PUMP.

4. Check the gas leakage. (Connected points)



Pipe size

(dia. : mm)

RAV

PIPE SIZE (mm)

Gas side Liquid side

RM301 9.5 6.4

RM401 12.7 6.4



Permissible Piping Length and
Height Difference

They vary according to the outdoor unit.
For details, refer to the Installation Manual

attached to the outdoor unit.

Flaring

෬ Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.

• Insert a flare nut into the pipe, and flare the
pipe.

As the flaring sizes of R32 or R410A differ

from those of refrigerant R22, the flare tools
newly manufactured for R32 or R410A are
recommended.
However, the
conventional tools can
be used by adjusting
projection margin of the
copper pipe.

q Projection margin in flaring: B (Unit: mm)

Rigid (Clutch type)

Outer dia. of

copper pipe

Tool used

Conventional

tool used

6.4 , 9.5 0.5 to 1.0 1.0 to 1.5

12.7 , 15.9 0.5 to 1.1 1.5 to 2.0

q Flaring dia. meter size: A (Unit: mm)

Outer dia. of copper pipe

A

+0

-0.4

6.4 9.1

9.5 13.2

12.7 16.6

15.9 19.7

B

Installation Manual

‒ 23 ‒

23-EN

REQUIREMENT

Tightening with an excessive torque may crack
the nut depending on installation conditions.
Tighten the nut within the specified tightening
torque.

Piping with outdoor unit

• Shape of valve differs according to the outdoor
unit.

For details of installation, refer to the Installation

Manual of the outdoor unit.

Heat insulation

Heat insulation for the pipes should be done
separately for the liquid side and gas side.
Because both of the liquid and gas side pipes
become a low temperature during cooling
operation, sufficient heat insulation should be
done to prevent condensation.

• Heat insulator with a heat resistance of 120°C or

more must be used for the gas side pipe.

• The pipe connection section of the indoor unit

must be heat insulated securely and compactly
with the attached heat insulator.

Fix with vinyl tape

Local side pipeHeat insulator

(attached)



Airtight test/Air purge, etc.

For airtight test,air purge, addition of refrigerant,
and gas leak check, follow the Installation Manual
attached to the outdoor unit.



Open fully valves of the outdoor
unit

Open the valve of the outdoor unit fully.
A hexagonal wrench is required for opening the
valve.
For details, refer to the Installation Manual
attached to the outdoor unit.

CAUTION

• Do not scratch the inner surface of the flared
part when removing burrs.

• Flare processing under the condition of
scratches on the inner surface of flare
processing part will cause refrigerant gas
leak.

• Check that the flared part is not scratched,
deformed, stepped, or flattened, and that
there are no chips adhered or other problems,
after flare processing.

• Do not apply refrigerating machine oil to the
flare surface.

* In case of flaring with the

conventional flare tool, pull it out
approx. 0.5 mm more than that
for R22 to adjust to the specified
flare size. The copper pipe gauge
is useful for adjusting projection
margin size.

A

Tightening connection

CAUTION

• Do not apply excessive torque. Otherwise, the
nut may crack depending on the conditions.

(Unit: N•m)

Outer dia. of copper pipe Tightening torque

6.4 mm (dia.) 14 to 18 (1.4 to 1.8 kgf•m)

9.5 mm (dia.) 33 to 42 (3.3 to 4.2 kgf•m)

12.7 mm (dia.) 50 to 62 (5.0 to 6.2 kgf•m)

15.9 mm (dia.) 68 to 82 (6.8 to 8.2 kgf•m)

q Tightening torque of flare pipe connections

Incorrect connections may cause not only a gas
leak, but also a trouble of the refrigeration cycle.
Align the centres of the connecting pipes and
tighten the flare nut as far as possible with your
fingers. Then tighten the nut with a spanner and
torque wrench as shown in the figure.

Work using double spanner

Installation Manual

‒ 24 ‒

24-EN



Wireless remote controller A-B
selection

Using 2 wireless remote controllers for the
respective air conditioners, when the 2 air
conditioners are closely installed.

Wireless remote controller B setup

1

Push TEMPORARY button on the indoor
unit to turn the air conditioner ON.

2

Point the wireless remote controller at the
indoor unit.

3

Push and hold button on the wireless
remote controller by the tip of the pencil.
“00” will be shown on the display.

4

Push during pushing . “B” will be
shown on the display and “00” will be
disappear and the air conditioner will turn
OFF. The wireless remote controller B is
memorized.

“B” Display

“00” Display

NOTE

• Repeat above step to reset wireless remote
controller to be A.

• The wireless remote controllers do not display
“A”.

• The factory default of the wireless remote
controllers is “A”.



Gas leak check

Check with a leak detector or soap water whether
gas leaks or not, from the pipe connecting section
or cap of the valve.

REQUIREMENT

Use a leak detector manufactured exclusively
HFC refrigerant (R410A, R134a, R32, etc.).

Installation Manual

‒ 25 ‒

25-EN

10

ELECTRICAL CONNECTION

WARNING

• Use the specified wires for wiring connect the terminals. Securely fix them to prevent
external forces applied to the terminals from affecting the terminals.

Incomplete connection or fixation may cause a fire or other trouble.

• Connect earth wire. (grounding work)

Incomplete grounding cause an electric shock.
Do not connect earth wires to gas pipes, water pipes, lightning conductor or telephone earth wires.

• Appliance shall be installed in accordance with national wiring regulations.

Capacity shortage of power circuit or incomplete installation may cause an electric shock or a fire.

CAUTION

• For power supply specifications, follow the Installation Manual of outdoor unit.

• Do not connect 220 – 240 V power to the terminal blocks (

A

, B ) for control wiring.

Otherwise, the system will fail.

• Do not damage or scratch the conductive core and inner insulator of power and system
interconnection wires while peeling them.

• Perform the electric wiring so that it does not come to contact with the high-temperature part of the
pipe.

The coating may melt resulting in an accident.

• Do not turn on the power of the indoor unit until vacuuming of the refrigerant pipes completes.



System interconnection wires specifications

System interconnection wires*

4 × 1.5 mm² or more

(H07 RN-F or 60245 IEC 66)

Up to 70 m

*Number of wire × wire size

Remote controller wiring

Remote controller wiring, remote controller
inter-unit wiring

Wire size: 2 × 0.5 to 2.0 mm²

Total wire length of remote controller wiring
and remote controller inter-unit wiring =
L + L1 + L2 + … Ln

In case of wired type only Up to 500 m

2 remote controllers Up to 300 m

2 remote controllers including a
wireless remote controller

Up to 400 m

Total wire length of remote controller inter-unit wiring = L1 + L2 + … Ln Up to 200 m

CAUTION

The remote controller wire and system interconnection wires cannot be parallel to contact each
other and cannot be stored in the same conduits. If doing so, a trouble may be caused on the
control system due to noise or other factor.

Remote
controller
wiring

Indoor unit

Remote

controller

Indoor unit Indoor unit Indoor unit

Remote controller inter-unit wiring

(max. 8 units)

LnL2L1

L

Installation Manual

‒ 26 ‒

26-EN



Wiring between indoor unit and outdoor unit

1

Figure below shows the wiring connections between the indoor and outdoor units and
between the indoor units and remote controller. The wires indicated by the broken lines or
dot-and-dash lines are provided at the locally.

2 Refer to the both indoor and outdoor unit wiring diagrams.
3 The power of the indoor unit is supplied from the outdoor unit.

Wiring diagram

q Single system q Simultaneous twin system

A B

11223

3

Remote controller

Remote controller wiring

Indoor side

Outdoor side

System interconnection
wires

Power supply

A B

1 2 3

A B

11223

3

Remote controller

Remote controller
inter-unit wiring

Remote controller wiring

Indoor side

Outdoor side

System interconnection wires

Power supply

Indoor power
inter-unit wiring

Indoor

side

q Simultaneous triple and double twin system

A B

1 2 3

A B

1 2 3

A B

1 2 3

A B

1 2 3

1 2 3

Indoor side

Outdoor side

Remote controller

Remote controller
wiring

System
interconnection
wires

Power supply

Indoor

side

Indoor

side

Indoor

side

Indoor power
inter-unit wiring

Indoor power
inter-unit wiring

Indoor power
inter-unit
wiring

Remote
controller
inter-unit
wiring

Remote
controller
inter-unit
wiring

Remote
controller
inter-unit
wiring

Triple

Double twin

* Use 2-core shield wire (MVVS 0.5 to 2.0 mm² or more) for the remote controller wiring in the

simultaneous twin, simultaneous triple and simultaneous double twin systems to prevent noise
problems. Be sure to connect both ends of the shield wire to earth leads.

* Connect earth wires for each indoor unit in the simultaneous twin, simultaneous triple and simultaneous

double twin systems.

Installation Manual

‒ 27 ‒

27-EN



Wired remote controller wiring

• As the wired remote controller wire has non-polarity, there is no problem if connections to indoor unit
terminal blocks A and B are reversed.

q Wiring diagram

A
B

A
B

Terminal block for
remote controller
wiring of indoor unit

Wired remote controller wire
(Procured locally)

Terminal block

Wired remote
controller unit

Installation Manual

‒ 28 ‒

28-EN

Power supply terminal block

Terminal block for
communication/
remote controller
wiring

Earth screw

Clamp base

Screw

Cord clamp

Screw

Terminal cover

Screw

N
L

3

Earth line

75 mm

55 mm

20 mm

10 mm

about
150 mm

Power
supply wire

<Stripping length of the power supply wire>

Wired remote
controller wire

Terminal block
for control/wired
remote controller
wiring

Cord clamp

Control wire

Earth screw for
shield wire

Power supply
terminal block

Cord clamp

Power supply
wire

Clamp base

Earth screw
for power
supply wire



Wiring Connection

How to connect the power supply wiring
and control wiring

The power supply wire and the control wire can be
connected without removing the front panel.

REQUIREMENT

Connect the power supply wire after connecting
the control wire for this model.

1. Remove the air inlet grille.

Open the air inlet grille upward and pull it

toward you.

2. Remove the terminal cover and the

clamp base.

3. Insert the power supply wire and control

wire (according to the local rule) into the
pipe hole on the wall.

4. Take the power supply wire out of the

cable slot on the rear panel so that it
protrudes about 150 mm from the front.

5. Insert the control wire fully into the

control/wired remote controller terminal
block U3, U4, A, B and secure it tightly
with screws.

6. Clamp the control wire with the cord

clamp.

7. Install the clamp base with a screw.

8. Insert the power supply wire fully into the

terminal block and secure it tightly with
screws. Tightening torque: 1.2 N·m (0.12
kgf·m) Secure the earth line with the
earth screw.

9. Clamp the power supply wire with the

cord clamp.

10. Attach the terminal cover and the air inlet

grille to the indoor unit.

CAUTION

• Be sure to refer to the wiring diagram
attached inside the front panel.

• Check local electrical cords an also any
specific wiring instructions and limitations.

• Do not catch the control wire when installing
the clamp base.

Installation Manual

‒ 29 ‒

29-EN



Wiring connection (twin, triple,
double twin system)

1

Connect a header unit by following the
procedure of wiring connection for single
system.

2

Connect system interconnection wire 1
and 2 of follower unit to terminal 1 and 2
on terminal block respectively.

System interconnection wire 3 is not used.

3

Connect the earth wire to the earth screw
located on the underside of the electrical
control box.

4

Clamp the system interconnection wire
with the cord clamp.

5

Attach the terminal cover and the air
intake grille to the indoor unit.

q When using optional wired remote

controller

The system interconnection wire and the wired
remote controller wire can be connected without
removing the front panel.

1

Remove the air intake grille.

Open the air intake grille upward and pull it
toward you.

2

Remove the terminal cover and the clamp
base.

3

Insert the system interconnection wire and
wired remote controller wire (according to
the local rule) into the pipe hole on the
wall.

4

Take the system interconnection wire and
wired remote controller wire out of the
cable slot on the rear panel so that it
protrudes about 150 mm from the front.

5

Insert the wired remote controller wire fully
into the wired remote controller / central

control terminal block,

A, B

and secure it

tightly with screws.

• Strip off approx. 9 mm the wire to be
connected.

• Non polarity, 2 core wire is used for wiring
of the wired remote controller. (0.5 mm² to

2.0 mm² wires)

6

Clamp the wired remote controller wire
with the cord clamp.

7

Install the clamp base with a screw.

8

Insert the system interconnection wire
fully into the terminal block and secure it
tightly with screws.

Tightening torque: 1.2 N·m (0.12 kgf·m)
Secure the earth wire with the earth screw.

9

Clamp the system interconnection wire
with the cord clamp.

10

Attach the terminal cover and the air intake
grille to the indoor unit.

CAUTION

• Be sure to refer to the wiring diagram
attached inside the front panel.

• Check local electrical cords and also any
specific wiring instructions and limitations.

• Do not catch the wired remote controller wire
when installing the clamp base.

Installation Manual

‒ 30 ‒

30-EN

11

APPLICABLE CONTROLS

A wired remote controller is necessary for this function. This function cannot be operate with a wireless
remote controller.

REQUIREMENT

• When you use this air conditioner for the
first time, it takes approx. 5 minutes until the
remote controller becomes available after
power-on. This is normal.

<When power is turned on for the first

time after installation>

It takes approx. 5 minutes until the remote

controller becomes available.

Power on“SETTING”

flashes

“SETTING”
goes out

Remote
controller is
available

Approx. 5 minutes

<When power is turned on for the second

(or later) time>

It takes approx. 1 minute until the remote

controller becomes available.

Power on“SETTING”

flashes

“SETTING”
goes out

Remote
controller is
available

Approx. 1 minutes

• Normal settings were made when the indoor
unit was shipped from factory.

Change the indoor unit settings as required.

• Use the wired remote controller to change
the settings.

* The settings cannot be changed using

the wireless remote controller, sub remote
controller, or remote-controller less system
(for central remote controller only).

Therefore, install the wired remote

controller to change the settings.



Basic procedure for changing
settings

Change the settings while the air conditioner is not
working.
(Stop the air conditioner before making settings.)

CAUTION

Set only the CODE No. shown in the following
table: Do NOT set any other CODE No.
If a CODE No. not listed is set, it may not be
possible to operate the air conditioner or other
trouble with the product may result.
* The displays appearing during the setting

process differ from the ones for previous
remote controllers (AMT31E). (there are more
CODE No.)

1

6

1
3

2

5

4

1

Push button and TEMP. button
simultaneously for 4 seconds or more.

After a while, the display flashes as shown in
the figure.
Confirm that the CODE No. is [01].

• If the CODE No. is not [01], push

button
to erase the display content, and repeat the
procedure from the beginning.

(No operation of the remote controller is

accepted for a while after

button is

pushed.)

(* Display content varies with the
indoor unit model.)

Installation Manual

‒ 31 ‒

31-EN

2

Each time button is pushed, indoor
unit numbers in the control group change
cyclically. Select the indoor unit to change
settings for.

The fan of the selected unit runs. The indoor
unit can be confirmed for which to change
settings.

3

Specify CODE No. [ ] with TEMP. /

buttons.

4

Select SET DATA [ ] with TIME /

buttons.

5

Push button. When the display changes
from flashing to lit, the setup is completed.

• To change settings of another indoor unit,
repeat from Procedure

2.

• To change other settings of the selected
indoor unit, repeat from Procedure

3.

Use

button to clear the settings.

To make settings after

button was

pushed, repeat from Procedure

2.

6

When settings have been completed, push

button to determine the settings.

When

button is pushed, “SETTING”
flashes and then the display content
disappears and the air conditioner enters the
normal stop mode.
(While “SETTING” is flashing, no operation of
the remote controller is accepted.)



Change of lighting time of filter
sign

According to the installation condition, the lighting
time of the filter sign (Notification of filter cleaning)
can be changed.
Follow to the basic operation procedure

(

1

→

2 → 3 → 4 → 5 → 6).

• For the CODE No.. in Procedure

3, specify [01].

• For the [SET DATA] in Procedure

4, select the

SET DATA of filter sign lighting time from the
following table.

SET DATA Filter sign lighting time

0000 None

0001 150H (Factory setting)

0002 2500H

0003 5000H

0004 10000H



To secure better effect of heating

When it is difficult to obtain satisfactory heating
due to installation place of the indoor unit or
structure of the room, the detection temperature of
heating can be raised. Also use a circulator, etc. to
circulate heat air near the ceiling.
Follow to the basic operation procedure

(

1

→

2 → 3 → 4 → 5 → 6).

• For the CODE No.. in Procedure

3, specify [06].

• For the SET DATA in Procedure

4, select

the SET DATA of shift value of detection
temperature to be set up from the table below.

SET DATA Detection temp shift value

0000 No shift

0001 +1°C

0002 +2°C (Factory setting)

0003 +3°C

0004 +4°C

0005 +5°C

0006 +6°C

Installation Manual

‒ 32 ‒

32-EN



Power saving mode

¿ Performing settings of the power

saving mode

* When an outdoor unit is used, the power level

is fixed to 75 % regardless of the value on the
display.

1

Push button for 4 seconds or more
when the air conditioner is not working.

flashes.

Indicates CODE No. “C2.”

2

Select an indoor unit to be set by pushing

(left side of the button).
Each time the button is pushed, unit
numbers change as follows:

UNIT No.

1-1

UNIT No.

1-2

UNIT No.

1-3

UNIT No.

1-4

The fan of the selected unit runs.

3

Adjust the power save setting by pushing
TIME / buttons.
Each push of the button changes the
power level by 1 % within the range from
100 % to 50 %.

* The factory default is 75 %.

Setting of power level
in power saving mode

4

Determine the setting by pushing
button.

5

Push button to complete the setting.



Remote controller switch
monitoring function

This function is available to call the service
monitor mode from the remote controller during a
test run to acquire temperatures of sensors of the
remote controller, indoor unit, and outdoor unit.

13

4

2

1

Push and buttons simultaneously
for at least 4 seconds to call the service
monitor mode.
The service monitor indicator lights up and
the header indoor unit number is displayed
first. CODE No. is also displayed.

2

Pushing TEMP. / buttons, select
the number of sensor (CODE No.) to be
monitored. (See the following table.)

3

Pushing (left side of the button),
select an indoor unit to be monitored. The
sensor temperatures of indoor units and
their outdoor unit in the control group are
displayed.

Installation Manual

‒ 33 ‒

33-EN



Adjustment of air direction

1. Using the remote controller switch, change the
up/down air direction by moving the horizontal
louver.

2. Adjust the right/left air direction by bending the
vertical grille inside of the air outlet port with
hands.

REQUIREMENT

Do not touch the horizontal louver directly with
hands; otherwise a trouble may be caused.
For handling of the horizontal louver, refer to
“Owner’s Manual” attached to the outdoor unit.

4

Push button to return to the normal
display.

Indoor unit data

CODE

No.

Data name

01 Room temperature (remote controller)

02 Indoor unit intake air temperature (TA)

03

Indoor unit heat exchanger (coil) temperature

(TCJ)

04

Indoor unit heat exchanger (coil) temperature

(TC)

F3

Indoor unit fan cumulative operating hours

(x1h)

Outdoor unit data

CODE

No.

Data name

60

Outdoor unit heat exchanger (coil)

temperature (TE)

61 Outside air temperature (TO)

62 Compressor discharge temperature (TD)

63 Compressor suction temperature (TS)

64 —

65 Heatsink temperature (THS)

6A Operating current (x1/10)

F1

Compressor cumulative operating hours

(x100h)

Installation Manual

‒ 34 ‒

34-EN



Group control

Simultaneous twin, triple or double twin system

A combination with an outdoor unit allows simultaneous ON / OFF operation of the indoor units. The
following system patterns are available.

- Two indoor units for the twin system

- Three indoor units for the triple system

- Four indoor units for the double-twin system

q Twin system

Outdoor unit

Indoor unit

Remote controller

Indoor unit

Finish of address setup by power-ON

q Triple system

Outdoor unit

Indoor unit

Remote controller

Indoor unit Indoor unit

Finish of address setup by power-ON

q Double twin

Outdoor unit

Indoor unit

Remote controller

Indoor unit Indoor unit Indoor unit

Finish of address setup by power-ON

• For wiring procedure and wiring method, follow to the “Electrical connection” in this manual.

• When the power supply has been turned on, the automatic address setup starts and which indicates
that address is being set up flashes on the display part.

During setup of automatic address, the remote controller operation is not accepted.

Required time up to the finish of automatic addressing is approx. 5 minutes.

Installation Manual

‒ 35 ‒

35-EN

Group control for system of multiple units

One remote controller can control maximum 8 indoor units as a group.

q Group control in single system

Outdoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit

Indoor unit

Remote controller

(Max. 8 units)

Indoor unit Indoor unit Indoor unit Indoor unit

Finish of address setup by power-ON

• For wiring procedure and wiring method of the individual line (identical refrigerant line) system, follow to
“Electrical connection”.

• Wiring between lines is performed in the following procedure.

Connect the terminal block (A / B) of the indoor unit connected with a remote controller to the terminal

blocks (A / B) of the indoor units of other indoor units by wiring the inter-unit wire of the remote
controller.

• When the power supply has been turned on, the automatic address setup starts and which indicates
that address is being set up flashes on the display part in about 3 minutes. During setup of automatic
address, the remote controller operation is not accepted.

Required time up to the finish of automatic addressing is approx. 5 minutes.

NOTE

In some cases, it is necessary to change the address manually after setup of the automatic address
according to the system configuration of the group control.

• The follow mentioned system configuration is a case when complex systems in which systems of the
simultaneous twin and simultaneous triple unit is controlled as a group by a remote controller.

(Example) Group control for complex system

Line system

Indoor No.

After setup of

automatic

address

After setup

change of manual

address

(example of
random setup)

(example of address
setup change)

Address: 1-1-1

Address: 1-1-2

Address: 2-1-2

Address: 2-1-2

Address: 2-2-2

Address: 3-3-1

Address: 3-1-2

Address: 3-1-2

Address: 3-2-2

Address: 2-2-2

Address: 3-3-2

Address: 1-2-2

Indoor address

Line address Group address

Procedure

example 1

Outdoor unit

<Single system> <Twin system> <Triple system>

Outdoor unit Outdoor unit

Indoor unit Indoor unit Indoor unit Indoor unit

Remote controller

Indoor unitIndoor unit

The above address is set by the automatic addressing when the power is turned on. However, line
addresses and indoor addresses are set randomly. For this reason, change the setting to match
line addresses with indoor addresses.

Installation Manual

‒ 36 ‒

36-EN

[Procedure example]

Manual address setup procedure

While the operation stops, change the setup.
(Stop the operation of the unit.)

2, 61

7

3

-1,

4
5
6

-1,

-1,

7

3

-3,

4

-3,

3

-2,

4

-2,

5

-2

5

-

3

1

Push + + buttons simultaneously
for 4 seconds or more. After a while, the
display part flashes as shown below.
Check the displayed CODE No. is [10].

• When the CODE No. is other than [10],
push

button to erase the display and

repeat procedure from the first step.

(After pushing

button, operation of
the remote controller is not accepted for
approx. 1 minute.)

(For a group control, No. of the firstly

displayed indoor unit becomes the header
unit.)

(* Display changes according to
the model No. of indoor unit.)

2

Every time button is pushed, the
indoor UNIT No. in the group control is
displayed in order. Select the indoor unit
of which setup is changed.

In this time, the position of the indoor unit of
which setup is changed can be confirmed
because fan of the selected indoor unit
operate.

3

1) Specify CODE No. [12] with TEMP.
/ buttons.

(CODE No. [12]: Line address)

2) Change the line address from [3] to [2]

with TIME / buttons.

3) Push

button.

In this time, the setup finishes when

the display changes from flashing to
lighting.

Indoor unit No. before setup change is displayed.

4

1) Specify CODE No. [13] with TEMP.

/ buttons.

(CODE No. [13]: Indoor address)

2) Change the indoor address from [3] to

[2] TIME / buttons.

3) Push

button.

In this time, the setup finishes when

the display changes from flashing to
lighting.

Indoor unit No. before setup change is displayed.

5

1) Specify CODE No. [14] TEMP. /

buttons.

(CODE No. [14]: Group address)

2) Change the SET DATA from [0001] to

[0002] TIME / buttons.

(SET DATA [Header unit: 0001] [Follower

unit: 0002])

3) Push

button.

In this time, the setup finishes when

the display changes from flashing to
lighting.

Indoor UNIT No. before setup change is displayed.

Installation Manual

‒ 37 ‒

37-EN

6

If there is other indoor unit to be changed,
repeat procedure

2 to 5 to change the

setup.
When the above setup has finished, push

to select the indoor UNIT No. before

change of setup, specify CODE No. [12], [13],
[14] in order with TEMP. / buttons,
and then check the changed contents.

Address change check Before change:
[3-3-1] → After change: [2-2-2]

Pushing button clears the contents of
which setup was changed.

(In this case, procedure from

2 is repeated.)

Indoor UNIT No. before setup change is displayed.

7

After check of the changed contents, push

button. (setup is determined.) When
button is pushed, the display disappears
and the status becomes the usual stop

status. (when

button is pushed the
operation from the remote controller is not
accepted for approx. 1 minute.)

* If the operation from the remote controller is

not accepted even 1 minute or more passed
after pushing

button, it is considered that

the address setup is incorrect.

In this case, the automatic address must be

again set up.

Therefore repeat procedure of the setup

change from the Procedure

1.

To recognize the position of the
corresponding indoor unit though the
indoor UNIT No. is known

Check the position during operation stop.
(Stop operation of the set.)

2

1, 3

1

1

Push + buttons simultaneously
for 4 seconds or more.
After a while, the display part flashes and
the display appears as shown below.
In this time, the position can be checked
because fan of the indoor unit operate.

• For the group control, the indoor UNIT No.
is displayed as [ ] and fans of all the
indoor units in the group control operate.

Check the displayed CODE No. is [01].

• When the CODE No. is other than [01],
push

button to erase the display and

repeat procedure from the first step.

(After pushing

button, operation of
the remote controller is not accepted for
approx. 1 minute.)

(* Display changes according to
the model No. of indoor unit.)

2

In the group control, every time
button is pushed, the indoor UNIT No. in
the group control is displayed in order.

In this time, the position of the indoor unit can
be confirmed because only fan of the selected
indoor unit operate.
(For a group control, No. of the firstly
displayed indoor unit becomes the header
unit.)

3

After confirmation, push button to
return the mode to the usual mode.

When

button is pushed, the display

disappears and the status becomes the usual
stop status.

(When

button is pushed the operation
from the remote controller is not accepted for
approx. 1 minute.)

Installation Manual

‒ 38 ‒

38-EN



8 °C operation

Pre-heating operation can be set for cold regions
where room temperature drops to below zero.

1

Push + + buttons simultaneously
for 4 seconds or more when the air
conditioner is not working.
After a while, the display part flashes as
shown below. Check the Displayed CODE
No. is [10].
When the CODE No. is other than [10], push

button to erase the display and repeat

procedure from the first step.
(After pushing

button, operation of the
remote controller is not accepted for approx.
1 minute.)

(* Display changes according to
the model No. of indoor unit.)

2

Every time button is pushed, the
indoor unit No. in the group control is
displayed in order. Select the indoor unit
of which setup is changed. In this time, the
position of the indoor unit of which setup
is changed can be confirmed because fan
of the selected indoor unit operate.

3

Specify CODE No. [d1] TEMP. /
buttons.

4

Select SET DATA [0001] TIME /
buttons.

SET DATA 8 °C Operation setting

0000

None

(factory default)

0001 8 °C Operation setting

5

Push button.
In this time, the setup finishes when the
display changes from flashing to lighting.

6

Push button. (setup is determined.)

When

button is pushed, the display

disappears and the status becomes the usual
stop status. (when

button is pushed the
operation from the remote controller is not
accepted for approx. 1 minute.)



Central control system

Air conditioners at multiple locations can be
controlled individually for each refrigeration
system from a control room.
Central control is not available with the supplied
wireless remote controller. Use the optional wired
remote controller.

q Wiring for central control

The terminal block for central control wiring (

U3

and U4

) is the same as that for optional wired
remote controller. Connect the central control wire
to the terminals (

U3 and U4

) on the terminal block
in the same way as the optional wired remote
controller.
For details, refer to the installation manual of the
applicable central control system.

Wired
remote
controller
wire

Terminal block
for control/wired
remote controller
wiring

Control wire

Earth screw for
shield wire

Cord clamp

Installation Manual

‒ 39 ‒

39-EN

q Centrally control the system by the SDI, DI series on their own setting for the terminating

resistor is required.

• Use switch SW01 for the setting.

• Make the terminating resistor setting only for the indoor unit with the smallest line address number.

123

AB

U3 U4

U1U3U2

U4

AB

U3 U4

AB

U1U3U2

U4

123 123

123

123

AB

U3 U4

123123

AB

123

123

AB

123

Refrigeration

system 1

Refrigeration

system 2

Refrigeration

system 3

Refrigeration

system 4

Central

control
device

Central

control
device

Central control device: Up to 10 units

Outdoor
unit

System interconnection wire
(AC 220-240 V serial)

Central control wires

*Connect 1 and 2 only

Follower
indoor unit

Follower
indoor unit

Indoor
unit

Follower
indoor unit

Header
indoor
unit

Header
indoor
unit

TCC-LINK
adapter
(option)
Required for
indoor units
other than
high wall type

Remote
controller
wiring

Remote

controller

Remote

controller

Remote

controller

Remote

controller

Group operation (up to 8 units) Twin and triple system (example of triple system)

Line address 1 2 4

SW01 bit1 ON OFF OFF

Remarks

Set bit1 of

SW01 to ON

Factory

default

Factory

default

(OFF at factory default)

Installation Manual

‒ 40 ‒

40-EN

How to set the SW01

1

Remove the front panel.

• Before removing the front panel, direct the
horizontal louver to the direction shown in
the figure below.

• Remove the screws securing the front
panel, and detach it from the indoor unit.

2

Remove the earth wire, TC sensor,
TCJ sensor motor lead (louver motor,
fan motor).

3

Remove the screws and detach the
electrical control box.

4

Remove the electrical control box cover
and set bit1 of SW01 on the board to ON.

(Do not touch SW02 as it is used for other
setting.)

SW01: OFF
SW02: OFF

SW01: ON

SW02: OFF

ON

12

ON

12

Factory default After setting

5

Assemble the removed parts by reversing
steps 1 to 3.

Insert the sensors and motor lead (louver
motor, fan motor) into the original positions.

CAUTION

Connect the sensor and the motor lead
certainly back to the previous position. If they
are not properly connected, the system will not
operate or other errors may occur.

Installation Manual

‒ 41 ‒

41-EN

q Centrally control the system by connecting to the TCC-LINK central control system.

Setting central control addresses

When air conditioners of the SDI, DI series are connected to the TCC-LINK central control system for
central control using this product, set the addresses of indoor units using the following procedure.

Completion of

ELECTRIC WORK construction

System power ON

Automatic address setup

Set central control addresses

End

Line address manual setting / change

Are indoor units under group control?

Are all indoor units under central control set to

header units (group address = 1)?

Set indoor units under central control to header units again,

and set those that are out of central control to follower units again.

* Refer to “Manual address setup procedure”.

No

* Refer to the manual of the central control system.

Yes

Yes

No

The system performs the address setup
automatically after power-on.

Change line addresses.
If automatic address setup has not been performed
successfully, set addresses manually.
* Refer to “Manual address setup procedure”.

Installation Manual

‒ 42 ‒

42-EN

In case of wired remote controller

2, 4
3

1, 5

Procedure 1

Keep button pushed for 4 seconds or more.
[TEST] is displayed on the display part and the
selection of mode in the test mode is permitted.

Procedure 2

Push button.

Procedure 3

Using button, select the operation mode,
[COOL] or [HEAT].

• Do not run the air conditioner in a mode other
than [COOL] or [HEAT].

• The temperature controlling function does not
work during test run.

• The detection of error is performed as usual.

Procedure 4

After the test run, push button to stop a
test run.
(Display part is same as procedure 1.)

Procedure 5

Push check button to cancel (release from) the
test run mode.
([TEST] disappears on the display and the status
returns to a normal.)

12

TEST RUN

A wired remote controller is necessary for this function. This function cannot be operate with a wireless
remote controller.



Before test run

• Before turning on the power supply, carry out
the following procedure.

1) Using 500V-megger, check that resistance

of 1MΩ or more exists between the terminal
block of the power supply and the earth
(grounding).

If resistance of less than 1MΩ is detected, do

not run the unit.

2) Check the valve of the outdoor unit being

opened fully.

• To protect the compressor at activation time,
leave power-ON for 12 hours or more before
operating.

WARNING

• Never press the electromagnetic contactor
to forcibly perform a test run. (This is very
dangerous because the protective device
does not work.)

• Before starting a test run, be sure to set
addresses following the installation manual
supplied with the outdoor unit.



How to execute a test run

Using the wired remote controller, operate the unit
as usual.
For the procedure of the operation, refer to the
attached Owner’s Manual.
A forced test run can be executed in the following
procedure even if the operation stops by thermo.­OFF.
In order to prevent a serial operation, the forced
test run is released after 60 minutes have passed
and returns to the usual operation.

CAUTION

• Do not use the forced test run for cases
other than the test run because it applies an
excessive load to the devices.

Installation Manual

‒ 43 ‒

43-EN

In case of wireless remote controller
(Forced test operation is performed in a
different way.)

REQUIREMENT

• For the operation procedure, be sure to follow
the Owner’s Manual.

• Finish the forced cooling operation in a short
time because it applies excessive strength to
the air conditioner.

• A test operation of forced heating is
unavailable. Perform a test operation by
heating operation using the switches of the
remote controller.

However heating operation may be not

carried out according to the temperature
conditions.

• Check wiring/piping of indoor and outdoor

units

1. When pushing [RESET] button for 10
seconds or more, “Pi!” sound is heard and
the operation changes to a forced cooling
operation. After approx. 3 minutes, a
cooling operation starts forcedly.

Check cool air starts blowing. If the

operation does not start, check wiring
again.

2. To stop a test operation, push [RESET]
button once again (Approx. 1 second).
The louver closes and the operation stops.

OPERATION /
RESET button

• Check transmission of remote controller

1. Push “START/STOP” button of the remote
controller to check an operation can also
start by the remote controller.

• “Cooling” operation by the remote

controller may be unavailable according
to the temperature conditions.

Check wiring/piping of the indoor and

outdoor units in forced cooling operation.

Installation Manual

‒ 44 ‒

44-EN

13

MAINTENANCE

¿ Daily maintenance

Cleaning of air filter

If is displayed on the remote controller, maintain
the air filter.

1

Push the button to stop the
operation, then turn off the circuit breaker.
After the cooling or dry operation, the
ventilation fan keeps running for self-

cleaning. Push the

button twice to

stop the operation.

3

1,2

Take out the air filter

1

Open the air intake grille until it stops, and
slightly raise the hook on the lower centre
of the air filter.

The air intake grille should not be opened
further; otherwise, the arms may come off and
the air intake grille may fall down.

Air filter

Cleaning with water or vacuum cleaner

• If dirt is heavy, clean the air filter by tepid water

with neutral detergent or water.

• After cleaning with water, dry the air filter

sufficiently in a shade place.

Mount the air filter

2

Turn on the circuit breaker, then push the

button on the remote controller to

start the operation.

3

After cleaning, push .

display disappears.

Installation Manual

‒ 45 ‒

45-EN

CAUTION

• Do not start the air conditioner while leaving air filter removed.

• Push the filter reset button. (

indication will be turn off.)

¿ Periodic maintenance

For environmental conservation, it is strongly recommended that the indoor and outdoor units of the air
conditioner in use be cleaned and maintained regularly to ensure efficient operation of the air conditioner.
When the air conditioner is operated for a long time, periodic maintenance (once a year) is recommended.
Furthermore, regularly check the outdoor unit for rust and scratches, and remove them or apply rustproof
treatment, if necessary.
As a general rule, when an indoor unit is operated for 8 hours or more daily, clean the indoor unit and
outdoor unit at least once every 3 months. Ask a professional for this cleaning / maintenance work.
Such maintenance can extend the life of the product though it involves the owner’s expense.
Failure to clean the indoor and outdoor units regularly will result in poor performance, freezing, water
leakage, and even compressor failure.

Inspection before maintenance

Following inspection must be carried out by a qualified installer or qualified service person.

Part Inspection method

Heat exchanger

Access from inspection opening and remove the access panel. Examine the heat exchanger if
there is any clogging or damages.

Fan motor Access from inspection opening and check if any abnormal noise can be heard.

Fan

Access from inspection opening and remove the access panel. Examine the fan if there are
any waggles, damages or adhesive dust.

Filter Go to installed location and check if there are any stains or breaks on the filter.

Drain pan

Access from inspection opening and remove the access panel. Check if there is any clogging
or drain water is polluted.

q Maintenance List

Part Unit Check (visual / auditory) Maintenance

Heat exchanger Indoor / outdoor

Dust / dirt clogging,
scratches

Wash the heat exchanger when it is
clogged.

Fan motor Indoor / outdoor Sound

Take appropriate measures when
abnormal sound is generated.

Filter Indoor Dust / dirt, breakage

y Wash the filter with water when it is

contaminated.

y Replace it when it is damaged.

Fan Indoor

y Vibration, balance
y Dust / dirt, appearance

y Replace the fan when vibration or

balance is terrible.

y Brush or wash the fan when it is

contaminated.

Air intake /
discharge grilles

Indoor / outdoor Dust / dirt, scratches

Fix or replace them when they are
deformed or damaged.

Drain pan Indoor

Dust / dirt clogging, drain
contamination

Clean the drain pan and check the
downward slope for smooth drainage.

Ornamental panel,
louvers

Indoor Dust / dirt, scratches

Wash them when they are contaminated
or apply repair coating.

Exterior Outdoor

y Rust, peeling of insulator
y Peeling / lift of coat

Apply repair coating.

Installation Manual

‒ 46 ‒

46-EN

14

TROUBLESHOOTING

A wired remote controller is necessary for this function. This function cannot be operate with a wireless
remote controller.



Confirmation and check

When a trouble occurred in the air conditioner, the
check code and the indoor UNIT No. appear on
the display part of the remote controller.
The check code is only displayed during the
operation.
If the display disappears, operate the air
conditioner according to the following
“Confirmation of error history” for confirmation.

Indoor UNIT No. in which
an error occurred

Check code



Confirmation of error history

When a trouble occurred on the air conditioner,
the trouble history can be confirmed with the
following procedure. (The trouble history is stored
in memory up to 4 troubles.)
The history can be confirmed from both operating
status and stop status.

3

2

1

Procedure 1

When pushing and buttons at the same
time for 4 seconds or more, the following display
appears.
If [Service check]

is displayed, the mode enters

in the trouble history mode.

• [01: Order of trouble history] is displayed in

CODE No. window.

• [Check code] is displayed in CHECK window.

• [Indoor unit address in which an error occurred]

is displayed in UNIT No.

Procedure 2

Every pushing of “TEMP.” button used
to set temperature, the trouble history stored in
memory is displayed in order.

The numbers in CODE No. indicate CODE No.
[01] (latest) → [04] (oldest).

REQUIREMENT

Do not push button because all the trouble
history of the indoor unit will be deleted.

Procedure 3

After confirmation, push button to return to the
usual display.

Installation Manual

‒ 47 ‒

47-EN



Error codes and parts to be checked

Wired

remote

controller

display

Wireless remote controller

Sensor block display of

receiving unit

Main defective parts

Judging

device

Parts to be checked / error description

Air conditioner

status

Indication

Operation Timer

Ready

GR GR OR

Flashing

E01

No header remote
controller

Remote
controller

Incorrect remote controller setting --- The
header remote controller has not been
set (including two remote controllers).

*

Remote controller
communication error

No signal can be received from the
indoor unit.

E02

Remote controller
transmission error

Remote
controller

System interconnection wires, indoor
P.C. board, remote controller.

--- No signal can be sent to the indoor
unit.

*

E03

Indoor unit-remote
controller regular
communication error

Indoor

Remote controller, network adapter,
indoor P.C. board --- No data is received
from the remote controller or network
adapter.

Auto-reset

E04

Indoor unit-outdoor unit
serial communication
error

Indoor

System interconnection wires, indoor
P.C. board, outdoor P.C. board --- Serial
communication error between indoor unit
and outdoor unit

Auto-reset

IPDU-CDB
communication error

E08

Duplicated indoor
addresses

Indoor

Indoor address setting error --- The
same address as the self-address was
detected.

Auto-reset

E09

Duplicated header
remote controllers

Remote
controller

Remote controller address setting error -

-- Two remote controllers are set as
header in the double-remote controller
control.

*

(* The header indoor unit stops raising
alarm and follower indoor units continue
to operate.)

Е10

CPU-CPU
communication error

Indoor

Indoor P.C. board --- Communication
error between main MCU and motor
microcomputer MCU.

Auto-reset

E18

Header unit follower unit
regular communication
error

Indoor

Indoor P.C. board --- Regular
communication is not possible between
header and follower indoor units or
between twin header (main) and follower
(sub) units.

Auto-reset

E31

IPDU communication
error

Outdoor

Communication error between IPDU and
CDB.

Entire stop

F01

ALT

Indoor unit heat
exchanger sensor (TCJ)
error

Indoor

Heat exchanger sensor (TCJ), indoor
P.C. board --- Open-circuit or short-circuit
of the heat exchanger sensor (TCJ) was
detected.

Auto-reset

F02

ALT

Indoor unit heat
exchanger sensor (TC)
error

Indoor

Heat exchanger sensor (TC), indoor P.C.
board --- Open-circuit or short-circuit of
the heat exchanger sensor (TC) was
detected.

Auto-reset

F04

ALT

Outdoor unit discharge
temp. sensor (TD) error

Outdoor

Outdoor temp. sensor (TD), outdoor P.C.
board --- Open-circuit or short-circuit of
the discharge temp. sensor was
detected.

Entire stop

F06

ALT

Outdoor unit temp.
sensor (TE / TS) error

Outdoor

Outdoor temp. sensors (TE / TS),
outdoor P.C. board --- Open-circuit or
short-circuit of the heat exchanger temp.
sensor was detected.

Entire stop

F07

ALT TL sensor error Outdoor

TL sensor may be displaced,
disconnected or short-circuited.

Entire stop

F08

ALT

Outdoor unit outside air
temp. sensor error

Outdoor

Outdoor temp. sensor (TO), outdoor P.C.
board --- Open-circuit or short-circuit of
the outdoor air temp. sensor was
detected.

Operation
continued

Installation Manual

‒ 48 ‒

48-EN

Wired

remote

controller

display

Wireless remote controller

Sensor block display of

receiving unit

Main defective parts

Judging

device

Parts to be checked / error description

Air conditioner

status

Indication

Operation Timer

Ready

GR GR OR

Flashing

F10

ALT

Indoor unit room temp.
sensor (TA) error

Indoor

Room temp. sensor (TA), indoor P.C.
board --- Open-circuit or short-circuit of
the room temp. sensor (TA) was detected.

Auto-reset

F12

ALT TS sensor error Outdoor

TS sensor may be displaced,
disconnected or short-circuited.

Entire stop

F13

ALT Heat sink sensor error Outdoor

Abnormal temperature was detected by
the temp. sensor of the IGBT heat sink.

Entire stop

F15

ALT

Temp. sensor connection
error

Outdoor

Temp. sensor (TE / TS) may be connected
incorrectly.

Entire stop

F29

SIM

Indoor unit, other P.C.
board error

Indoor Indoor P.C. board --- EEPROM error. Auto-reset

F31

SIM Outdoor unit P.C. board Outdoor

Outdoor P.C. board ---- In the case of
EEPROM error.

Entire stop

H01

Outdoor unit compressor
breakdown

Outdoor

Current detect circuit, power voltage --­Minimum frequency was reached in the
current releasing control or short-circuit
current (Idc) after direct excitation was
detected.

Entire stop

H02

Outdoor unit compressor
lock

Outdoor

Compressor circuit --- Compressor lock
was detected.

Entire stop

H03

Outdoor unit current
detect circuit error

Outdoor

Current detect circuit, outdoor unit P.C.
board --- Abnormal current was detected
in AC-CT or a phase loss was detected.

Entire stop

H04

Case thermostat
operation

Outdoor Malfunction of the case thermostat Entire stop

H06

Outdoor unit low­pressure system error

Outdoor

Current, high-pressure switch circuit,
outdoor P.C. board --- Pressure sensor
error was detected or low-pressure
protective operation was activated.

Entire stop

L03

SIM

Duplicated header
indoor units

Indoor

Indoor address setting error --- There are
two or more header units in the group.

Entire stop

L07

SIM

Group line in individual
indoor unit

Indoor

Indoor address setting error --- There is
at least one group-connected indoor unit
among individual indoor units.

Entire stop

L08 SIM

Indoor group address
not set

Indoor

Indoor address setting error --- Indoor
address group has not been set.

Entire stop

L09

SIM

Indoor unit capacity not
set

Indoor Indoor unit capacity has not been set. Entire stop

L10

SIM Outdoor unit P.C. board Outdoor

In the case of outdoor P.C. board jumper
wire (for service) setting error.

Entire stop

L20

SIM

LAN communication
error

Network
adapter
central
control

Address setting, central control remote
controller, network adapter --­Duplication of address in central control
communication.

Auto-reset

L29

SIM Other outdoor unit error Outdoor

Other outdoor unit error. Entire stop

1) Communication error between IPDU
MCU and CDB MCU.

Entire stop

2) Abnormal temperature was detected by
the heat sink temp. sensor in IGBT.

L30

SIM

Abnormal external input
into indoor unit
(interlock)

Indoor

External devices, outdoor unit P.C. board

--- Abnormal stop due to incorrect external

input into CN80.

Entire stop

L31

SIM

Phase sequence error,
etc.

Outdoor

Power supply phase sequence, outdoor
unit P.C. board --- Abnormal phase
sequence of the 3-phase power supply.

Operation
continued
(thermostat
OFF)

Installation Manual

‒ 49 ‒

49-EN

Wired

remote

controller

display

Wireless remote controller

Sensor block display of

receiving unit

Main defective parts

Judging

device

Parts to be checked / error description

Air conditioner

status

Indication

Operation Timer

Ready

GR GR OR

Flashing

P01

ALT Indoor unit fan error Indoor

Indoor fan motor, indoor P.C. board --­Indoor AC fan error (fan motor thermal
relay activated) was detected.

Entire stop

P03

ALT

Outdoor unit discharge
temp. error

Outdoor

An error was detected in the discharge
temp. releasing control.

Entire stop

P04

ALT

Outdoor unit high­pressure system error

Outdoor

High-pressure switch --- The IOL was
activated or an error was detected in the
high-pressure releasing control using the
TE.

Entire stop

P05

ALT Open phase detected Outdoor

The power wire may be connected
incorrectly. Check open phase and
voltages of the power supply.

Entire stop

P07

ALT Heat sink overheat Outdoor

Abnormal temperature was detected by
the temp. sensor of the IGBT heat sink.

Entire stop

P10

ALT

Indoor unit water
overflow detected

Indoor

Drain pipe, clogging of drainage, float
switch circuit, indoor P.C. board --­Drainage is out of order or the float
switch was activated.

Entire stop

P12

ALT

Abnormal operation of
the fan of the indoor unit

Indoor

Abnormal operation of the indoor fan
motor, indoor P.C. board, or indoor DC
fan (over current or lock, etc.) is detected.

Entire stop

P15

ALT Gas leakage detected Outdoor

There may be gas leakage from the pipe
or connecting part. Check for gas leakage.

Entire stop

P19

ALT 4-way valve error

Outdoor
(Indoor)

4-way valve, indoor temp. sensors (TC /
TCJ) --- An error was detected due to
temperature drop of the indoor unit heat
exchanger sensor during heating.

Auto-reset

P20

ALT

High-pressure protective
operation

Outdoor High-pressure protection. Entire stop

P22

ALT Outdoor unit fan error Outdoor

Outdoor unit fan motor, outdoor unit P.C.
board --- An error (overcurrent, locking,
etc.) was detected in the outdoor unit fan
drive circuit.

Entire stop

P26

ALT

Outdoor unit inverter Idc
activated

Outdoor

IGBT, outdoor unit P.C. board, inverter
wiring, compressor --- Short-circuit
protection for compressor drive circuit
devices (G-Tr / IGBT) was activated.

Entire stop

P29

ALT

Outdoor unit position
error

Outdoor

Outdoor unit P.C. board, high-pressure
switch --- Compressor motor position
error was detected.

Entire stop

P31

ALT Other indoor unit error Indoor

Another indoor unit in the group is raising
an alarm.

Entire stop

E03 / L07 / L03 / L08 alarm check
locations and error description.

Auto-reset

: Lighting : Flashing : OFF : The air conditioner automatically enters the auto-address setting mode.
ALT : When two LEDs are flashing, they flash alternately. SIM: When two LEDs are flashing, they flash in synchronization.
Receiving unit display OR : Orange GR : Green

Installation Manual

‒ 50 ‒

50-EN

Work instructions

The existing R22 and R410A piping can be reused
for inverter R32 product installations.

WARNING

Confirming the existence of scratches or
dents on the existing pipes and confirming
the reliability of the pipe strength are
conventionally referred to the local site.
If the specified conditions can be cleared,
it is possible to update existing R22 and
R410A pipes to those for R32 models.

Basic conditions needed to reuse
existing pipes

Check and observe the presence of three
conditions in the refrigerant piping works.

1. Dry (There is no moisture inside of the pipes.)

2. Clean (There is no dust inside of the pipes.)

3. Tight (There are no refrigerant leaks.)

Restrictions for use of existing pipes

In the following cases, the existing pipes
should not be reused as they are. Clean the
existing pipes or exchange them with new
pipes.

1. When a scratch or dent is heavy, be sure to use

new pipes for the refrigerant piping works.

2. When the existing pipe thickness is thinner than

the specified “Pipe diameter and thickness,” be
sure to use new pipes for the refrigerant piping
works.

• The operating pressure of refrigerant is high.
If there is a scratch or dent on the pipe or a
thinner pipe is used, the pressure strength
may be inadequate, which may cause the
pipe to break in the worst case.

* Pipe diameter and thickness (mm)

Pipe outer diameter Ø6.4 Ø9.5 Ø12.7 Ø15.9

Thickness

R32, R410A

0.8 0.8 0.8 1.0

R22

3. When the outdoor unit was left with the pipes
disconnected, or the gas leaked from the pipes
and the pipes were not repaired and refilled.

• There is the possibility of rain water or air,

including moisture, entering the pipe.

4. When refrigerant cannot be recovered using a
refrigerant recovery unit.

• There is the possibility that a large quantity of

dirty oil or moisture remains inside the pipes.

5. When a commercially available dryer is
attached to the existing pipes.

• There is the possibility that copper green rust

has been generated.

6. When the existing air conditioner is removed
after refrigerant has been recovered.

Check if the oil is judged to be clearly different

from normal oil.

• The refrigerator oil is copper rust green in

color:

There is the possibility that moisture has

mixed with the oil and rust has been
generated inside the pipe.

• There is discolored oil, a large quantity of

residue, or a bad smell.

• A large quantity of shiny metal dust or other

wear residue can be seen in the refrigerant oil.

7. When the air conditioner has a history of the
compressor failing and being replaced.

• When discolored oil, a large quantity of

residue, shiny metal dust, or other wear
residue or mixture of foreign matter is
observed, trouble will occur.

8. When temporary installation and removal of
the air conditioner are repeated such as when
leased etc.

9. If the type of refrigerator oil of the existing
air conditioner is other than the following oil
(Mineral oil), Suniso, Freol-S, MS (Synthetic
oil), alkyl benzene (HAB, Barrel-freeze), ester
series, PVE only of ether series.

• The winding-insulation of the compressor

may deteriorate.

NOTE

The above descriptions are results have been
confirmed by our company and represent
our views on our air conditioners, but do not
guarantee the use of the existing pipes of air
conditioners that have adopted R32, R410A in
other companies.

Curing of pipes

When removing and opening the indoor or outdoor
unit for a long time, cure the pipes as follows:

• Otherwise rust may be generated when

moisture or foreign matter due to condensation
enters the pipes.

• The rust cannot be removed by cleaning, and

new pipes are necessary.

Placement

location

Term Curing manner

Outdoors

1 month or more Pinching

Less than 1 month

Pinching or taping

Indoors Every time

APPENDIX

Installation Manual

‒ 51 ‒

51-EN

Are there scratches or dents on the existing pipes?

Is it possible to operate the existing air conditioner?

y After the existing air conditioner is operated in cooling

mode for approx. 30 minutes or longer,* recover the
refrigerant.

y For cleaning the pipes and recovering oil

y Refrigerant recovery: Pump down method

y Remove the existing air conditioner from the piping

and carry out flushing (nitrogen pressure 0.5 MPa) to
remove any remains inside of the pipe.

Note: In case of twin pipes, also be sure to fl ush the

branching pipe.

Connect the indoor / outdoor units to the existing pipe.

y Use a flare nut attached to the main unit for the indoor

/ outdoor units. (Do not use the flare nut of the existing
pipe.)

y Re-machine the flare machining size to size for R32,

R410A.

y (Airtight test), Vacuum dry, Refrigerant charge, Gas

leak check

Test run

Was largely discolored oil or a large quantity

of remains discharged? (When the oil deteriorates,

the color of the oil changes to a muddy or

black color.)

Existing pipes: Cannot be used.

y Use new pipes.

Clean the pipes or use new pipes.

Piping necessary to change the flare nut /

machining size due to pipe compression

1) Flare nut width: H

H

(mm)

Copper pipe
outer diameter

Ø6.4 Ø9.5 Ø12.7 Ø15.9

For R32, R410A 17 22 26 29

For R22 Same as above 24 27

2) Flare machining size: A

A

(mm)

Copper pipe
outer diameter

Ø6.4 Ø9.5 Ø12.7 Ø15.9

For R32, R410A 9.1 13.2 16.6 19.7

For R22 9.0 13.0 16.2 19.4

Becomes a little larger for R32, R410A

Do not apply refrigerator oil to the flare surface.

(If there is discharge of remains, it is judged that a
large quantity of remains are present.)

YES

YES

NO

NO

NO

YES

Nitrogen gas pressure 0.5 MPa

144 / 9 Moo 5, Bangkadi Industrial Park, Tivanon Road, Tambol Bangkadi, Amphur Muang, Pathumthani 12000, Thailand

1122650199