Toshiba RAV-HM301SDTY-E User manual

English
D0X7303301- 01
For commercial use
R32
AIR CONDITIONER (SPLIT TYPE)
Owner’s Manual
Indoor Unit
Model name:
<Slim Duct Type>
RAV-HM301SDTY-E
RAV-HM401SDTY-E
RAV-HM561SDTY-E
RAV-HM801SDTY-E
OM_D0X7303301-01_EN_Print.book Page 1 Friday, May 19, 2023 6:48 PM

– 1 –
1-EN 2-EN
Original instruction
Thank you very much for purchasing TOSHIBA Air Conditioner.
Please read this owner’s manual carefully before using your Air Conditioner.
• Be sure to obtain the “Owner’s manual” and “Installation manual” from constructor (or dealer).
• Request to constructor or dealer.
Please clearly explain the contents of the Owner’s manual and hand over it.
ADOPTION OF R32 REFRIGERANT
This Air Conditioner has adopted a HFC (R32) which does not destroy the ozone layer.
Be sure to combine with an outdoor unit for the R32 refrigerant.
Contents
1 Precautions for Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1 Précautions de sécurité. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1 Vorsichtsmaßnahmen für die Sicherheit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1 Precauzioni per la sicurezza . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1 Precauciones de seguridad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
1 Precauções de segurança. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
1 Veiligheidsvoorzorgen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
1Προφυλάξεις ασφαλείας . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
1Меры предосторожности . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
2 Applicable controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
3 Test run. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
5 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
6 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
7 Notice code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
OM_D0X7303301-01_EN_Print.book Page 1 Friday, May 19, 2023 6:48 PM

– 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
with the outdoor unit 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.
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 (*1)
• 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 (*1)
• 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.
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.
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.
Work undertaken Protective gear worn
All types of work Protective gloves
‘Safety’ working clothing
Electrical-related work
Gloves to provide protection from electric shock
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 toecap
Repair of outdoor unit Gloves to provide protection for electricians
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.
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.
3-EN 4-EN
OM_D0X7303301-01_EN_Print.book Page 2 Friday, May 19, 2023 6:48 PM

– 3 –
5-EN 6-EN
Warning Indications on the Air Conditioner Unit
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.
CAUTION
High temperature parts.
You might get burned when removing this panel.
CAUTION
Do not touch the aluminium fins 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.
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.
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
BURST HAZARD
Open the service valves before
the operation, otherwise there
might be the burst.
Warning indication Description
1Precautions for Safety
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 or service person 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 specified 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 intake grille 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 intake grille 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, 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.
• 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 intake grille of the indoor unit to undertake work.
OM_D0X7303301-01_EN_Print.book Page 3 Friday, May 19, 2023 6:48 PM

– 4 –
EN
• Wear protective gloves and safety work clothing during installation,
servicing and removal.
• Do not touch the aluminum 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 indoor 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.
• The refrigerant used by this air conditioner is the R32.
• 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 when 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 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.
• To transport the air conditioner, wear shoes with additional
protective toecap.
• 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.
• 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.
• 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.
• Appliance and pipe-work shall be installed, operated and stored in
a room with a floor area larger than Amin m2.
How to get Amin m2: Amin = (M / (2.5 × 0.22759 × h0))2
M is the refrigerant charge amount in appliance in kg;
h0is 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
• Suction duct length must be longer than 850mm.
• When the indoor unit is to be suspended, the designated hanging
bolts (M10 or W3/8) and nuts (M10 or W3/8) must be used.
7-EN 8-EN
OM_D0X7303301-01_EN_Print.book Page 4 Friday, May 19, 2023 6:48 PM

– 5 –
9-EN 10-EN
• 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 specified 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 truck to carry in the air conditioner units and use winch
or hoist at installation of them.
• Helmet must be worn to protect your head from falling objects.
Especially, when you work under an inspection opening, helmet
must be worn to protect your head from falling objects from the
opening.
• The unit can be accessed from the service panel shown in the figure.
• After the unit has been suspended and installed, take dust-proof
measures for the air intake and air discharge openings (cover
these openings) to ensure that no dust will enter inside the unit at
any point until the construction work has been completed.
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 an 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 tightly and in a proper
manner.
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, 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.
• Be sure to connect earth wire. (Grounding work)
Incomplete earthing 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.
OM_D0X7303301-01_EN_Print.book Page 5 Friday, May 19, 2023 6:48 PM

– 6 –
EN
• 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.
• Under no circumstances, the power supply wire or the indoor and
outdoor connecting wire must be connected in the middle
(Connection using a solderless terminal etc.).
Connection trouble in the places where the wire is connected in the
middle 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 check code 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 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 (500V
Megger) to check the resistance is 1 MΩor 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.
• After the installation work, follow the Owner’s Manual to explain to
the customer how to use and maintain the unit.
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.
• When 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.
(*1) Refer to the “Definition of qualified installer or qualified service
person”.
11-EN 12-EN
OM_D0X7303301-01_EN_Print.book Page 6 Friday, May 19, 2023 6:48 PM

– 7 –
13-EN 14-EN
CAUTIONCAUTION
This Air Conditioner has adopted a refrigerant HFC (R32) which
does not destroy the ozone layer.
• As the R32 refrigerant is easily affected by impurities such us
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 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.
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.
Precautions for using R32 refrigerant
The basic installation work procedures are the same as conventional
refrigerant (R410A, R22) models.
However, Please read through this manual after understanding the
contents below;
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;
WARNING
• Models that use refrigerant R32 have a different charging port
thread diameter to prevent erroneous charging with refrigerant R22
and for safety.
• Do not use means to accelerate the defrosting process or to clean,
other than those recommended by the manufacturer.
• The appliance shall be stored in a room without continuously
operating ignition sources (for example: open flames, an operating
gas appliance or an operating electric heater.)
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odor.
• The manufacturer may provide other suitable examples or may
provide additional information about the refrigerant odor.
CAUTIONCAUTION
When a flammable refrigerant is used, all appliances shall be
charged with refrigerant at the manufacturing location or charged on
site as recommended by the manufacturer.
A part of an appliance that is charged on site, which requires brazing
or welding in the installation shall not be shipped with a flammable
refrigerant charge. Joints made in the installation between parts of
the refrigerating system, with at least one part charged, shall be
made in accordance with the following.
• A brazed, welded, or mechanical connection shall be made before
opening the valves to permit refrigerant to flow between the
refrigerating system parts. A vacuum valve shall be provided to
evacuate the interconnecting pipe and/or any uncharged
refrigerating system part.
• Mechanical connectors used indoors shall comply with ISO 14903.
When mechanical connectors are reused indoors, sealing parts
shall be renewed. When flared joints are reused indoors, the flare
part shall be re-fabricated.
• Refrigerant tubing shall be protected or enclosed to avoid damage.
Flexible refrigerant connectors (such as connecting lines between
the indoor and outdoor unit) that may be displaced during normal
operations shall be protected against mechanical damage.
OM_D0X7303301-01_EN_Print.book Page 7 Friday, May 19, 2023 6:48 PM

– 8 –
EN
General (Installation space / area)
• The installation of pipe-work shall be kept to a minimum.
• Pipe-work shall be protected from physical damage.
• The compliance with national gas regulations shall be observed.
• The mechanical connections shall be accessible for maintenance
purposes.
• In cases that require mechanical ventilation, ventilation openings
shall be kept clear of obstruction.
• When disposing of the product is used, be based on national
regulations with properly processed.
• The servicing shall be performed only as recommended by the
manufacturer.
• Where the appliance using flammable refrigerants is installed, Be
aware that;
- The appliance shall be stored in a well-ventilated area where the
room size corresponds to the room area as specified for
operation.
- The appliance shall be stored in a room without continuously
operating open flames (for example an operating gas appliance)
and ignition sources (for example an operating electric heater).
- The appliance shall be stored so as to prevent mechanical
damage from occurring.
• Equipment piping in the occupied space shall be installed in such a
way to protect against accidental damage in operation and service.
• Precautions shall be taken to avoid excessive vibration or pulsation
to refrigerating piping.
• Protection devices, piping and fittings shall be protected as far as
possible against adverse environmental effects, for example, the
danger of water collecting and freezing in relief pipes or the
accumulation of dirt and debris.
• Provision shall be made for expansion and contraction of long runs
of piping.
• Piping in refrigerating systems shall be so designed and installed to
minimize the likelihood hydraulic shock damaging the system.
• Solenoid valves shall be correctly positioned in the piping to avoid
hydraulic shock.
• Solenoid valves shall not block in liquid refrigerant unless adequate
relief is provided to the refrigerant system low pressure side.
• Steel pipes and components shall be protected against corrosion
with a rustproof coating before applying any insulation.
• Flexible pipe elements shall be protected against mechanical
damage, excessive stress by torsion, or other forces. They should
be checked for mechanical damage annually.
• The indoor equipment and pipes shall be securely mounted and
guarded such that accidental rupture of equipment cannot occur
from such events as moving furniture or reconstruction activities.
• Where safety shut off valves are specified, the minimum room area
may be determined based on the maximum amount of refrigerant
that can be leaked as determined in Installation Manual.
• Where safety shut off valves are specified, the location of the valve
in the refrigerating system relative to the occupied spaces shall be
as described in Installation Manual.
• Field-made refrigerant joints indoors shall be tightness tested. The
test method shall have a sensitivity of 5 grams per year of
refrigerant or better under a pressure of at least 0,25 times the
maximum allowable pressure. No leak shall be detected.
• The total refrigerant charge in the system cannot exceed the
requirements for minimum floor area of the smallest room that is
served. For minimum floor area requirements for indoor units, see
the installation and owner's manual of the outdoor unit.
• When connecting to an outdoor unit of R32 refrigerant and using a
leak detector, always turn on the power of the indoor unit after
installation except during service in order to detect refrigerant
leakage and take safety measures.
15-EN 16-EN
OM_D0X7303301-01_EN_Print.book Page 8 Friday, May 19, 2023 6:48 PM

– 9 –
17-EN 18-EN
Unventilated area
• The appliance shall be stored so as to prevent mechanical damage
from occurring.
Information on servicing
1. Check to the area
• Prior to beginning work on systems containing flammable
refrigerants, safety checks are necessary to ensure that the risk of
ignition is minimized. For repair to the refrigerating system, the
precautions in item 2 to 6 shall be complied with prior to conducting
work on the system.
2. Work procedure
• Work shall be undertaken under a controlled procedure so as to
minimize the risk of a flammable gas or vapour being present while
the work is being performed.
• When connecting to an outdoor unit of R32 refrigerant and using a
leak detector, the fan may automatically operate even if the air
conditioner is stopped when a refrigerant leak is detected. Be
careful not to get injured by the fan.
3. General work area
• All maintenance staff and others working in the local area shall be
instructed on the nature of work being carried out.
• Work in confined spaces shall be avoided.
• The area around the workspace shall be sectioned off.
• Ensure that the conditions within the area have been made safe by
control of flammable material.
4. Checking for presence of refrigerant
• The area shall be checked with an appropriate refrigerant detector
prior to and during work, to ensure the technician is aware of
potentially flammable atmospheres.
• Ensure that the leak detection equipment being used is suitable for
use with all applicable refrigerants, i.e. non sparking, adequately
sealed or intrinsically safe.
5. Presence of fire extinguisher
• If any hot work is to be conducted on the refrigeration equipment or
any associated parts, appropriate fire extinguishing equipment
shall be available on hand.
• Have a dry powder or CO2fire extinguisher adjacent to the
charging area.
6. No ignition sources
• No person carrying out work in relation to a refrigeration system
which involves exposing any pipe work shall use any sources of
ignition in such a manner that it may lead to the risk of fire or
explosion.
• All possible ignition sources including cigarette smoking, should be
kept sufficiently far away from the site of installation, repairing,
removing and disposal, during which refrigerant can possibly be
released to the surrounding space.
• Prior to work taking place, the area around the equipment is to be
surveyed to make sure that there are no flammable hazards or
ignition risks. "No Smoking" signs shall be displayed.
7. Ventilated area
• Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting any hot
work.
• A degree of ventilation shall continue during the period that the
work is carried out.
• The ventilation should safely disperse any released refrigerant and
preferably expel it externally into the atmosphere.
8. Checks to the refrigeration equipment
• Where electrical components are being changed, installer shall be
fit for the purpose and to the correct specification.
OM_D0X7303301-01_EN_Print.book Page 9 Friday, May 19, 2023 6:48 PM

– 10 –
EN
• At all times the manufacturer's maintenance and service guidelines
shall be followed. If in doubt consult the manufacturer's technical
department for assistance.
• The following checks shall be applied to installations using
flammable refrigerants.
- The charge size is in accordance with the room size within which
the refrigerant containing parts are installed.
- The ventilation machinery and outlets are operating adequately
and are not obstructed.
- If an indirect refrigerating circuit is being used, the secondary
circuit shall be checked for the presence of refrigerant.
- Marking to the equipment continues to be visible and legible.
Markings and signs that are illegible shall be corrected.
- Refrigeration pipe or components are installed in a position where
they are unlikely to be exposed to any substance which may
corrode refrigerant contain- ing components, unless the
components are constructed of materials which are inherently
resistant to being corroded or are suitably protected against being
so corroded.
9. Checks to electrical devices
• Repair and maintenance to electrical components shall include
initial safety checks and component inspection procedures.
• If a fault exists that could compromise safety, then no electrical
supply shall be connected to the circuit until it is satisfactorily dealt
with.
• If the fault cannot be corrected immediately but it is necessary to
continue operation, an adequate temporary solution shall be used.
This shall be reported to the owner of the equipment so all parties
are advised.
• Initial safety checks shall include;
- That capacitors are discharged to avoid possibility of sparking.
- That there no live electrical components and wiring are exposed
while charging, recovering or purging the system.
- That there is continuity of earth bonding.
10. Repairs to sealed components
• During repairs to sealed components, all electrical supplies shall be
disconnected from the equipment being worked upon prior to any
removal of sealed covers, etc.
• If it is absolutely necessary to have an electrical supply to
equipment during servicing, then a permanently operating form of
leak detection shall be located at the most critical point to warn of a
potentially hazardous situation.
• Particular attention shall be paid to the following to ensure that by
working on electrical components, the casing is not altered in such
a way that the level of protection is affected.
• This shall include damage to cables, excessive number of
connections, terminals not made to original specification, damage
to seals, incorrect fitting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to the
point that they no longer serve the purpose of preventing the
ingress of flammable atmospheres.
• Replacement parts shall be in accordance with the manufacturer's
specifications.
NOTE: The use of silicon sealant may inhibit the effectiveness of
some types of leak detection equipment. Intrinsically safe
components do not have to be isolated prior to working on them.
11. Repair to intrinsically safe components
• Do not apply any permanent inductive or capacitance loads to the
circuit without ensuring that this will not exceed the permissible
voltage and current permitted for the equipment in use.
• Intrinsically safe components are the only types that can be worked
on while live in the presence of a flammable atmosphere.
19-EN 20-EN
OM_D0X7303301-01_EN_Print.book Page 10 Friday, May 19, 2023 6:48 PM

– 11 –
21-EN 22-EN
• The test apparatus shall be at the correct rating.
• Replace components only with parts specified by the manufacturer.
• Other parts may result in the ignition of refrigerant in the
atmosphere from a leak.
12. Cabling
• Check that cabling will not be subject to wear, corrosion, excessive
pressure, vibration, sharp edges or any other adverse
environmental effects.
• Check shall also take into account the effects of aging or continual
vibration from sources such as compressors or fans.
13. Detection of flammable refrigerants
• Under no circumstances shall potential sources of ignition be used
in the searching for or detection of refrigerant leaks.
• A halide torch (or any other detector using a naked flame) shall not
be used.
• Electronic leak detectors may be used to detect refrigerant leaks
but, in the case of flammable refrigerants, the sensitivity may not
be adequate, or may need re-calibration. (Detection equipment
shall be calibrated in a refrigerant-free area.)
• Ensure that the detector is not a potential source of ignition and is
suitable for the refrigerant used.
• Leak detection equipment shall be set at a percentage of the LFL
of the refrigerant and shall be calibrated to the refrigerant
employed, and the appropriate percentage of gas (25 % maximum)
is confirmed.
• Leak detection fluids are also suitable for use with most refrigerants
but the use of detergents containing chlorine shall be avoided as
the chlorine may react with the refrigerant and corrode containing
chlorine.
• If a leak is suspected, all naked flames shall be removed/
extinguished.
• If a leakage of refrigerant is found which requires brazing, all of the
refrigerant shall be recovered from the system, or isolated (by
means of shut off valves) in a part of the system remote from the
leak.
14. Leak detection methods
• Electronic leak detectors shall be used to detect flammable
refrigerants leak, but the sensitivity may not be adequate, or may
need re-calibration. (Detection equipment shall be calibrated in a
refrigerant-free area.)
• Ensure that the detector is not a potential source of ignition and is
suitable for the refrigerant used.
• Leak detection equipment shall be set at a percentage of the LFL
of the refrigerant and shall be calibrated to the refrigerant
employed and the appropriate percentage of gas (25 % maximum)
is confirmed.
• Leak detection fluids are suitable for use with most refrigerants but
the use of detergents containing chlorine shall be avoided as the
chlorine may react with the refrigerant and corrode the copper
pipe-work.
• If a leak is suspected, all naked flames shall be removed/
extinguished.
• If a leakage of refrigerant is found which requires brazing, all of the
refrigerant shall be recovered from the system, or isolated (by
means of shut off valves) in a part of the system remote from the
leak.
• Oxygen free nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
15. Removal and evacuation
• When breaking into the refrigerant circuit to make repairs or for any
other purpose, Conventional procedures shall be used. However, it
is important that best practice is followed since flammability is a
consideration.
The following procedure shall be adhered to:
OM_D0X7303301-01_EN_Print.book Page 11 Friday, May 19, 2023 6:48 PM

– 12 –
EN
23-EN 24-EN
- remove refrigerant;
- purge the circuit with inert gas;
- evacuate;
- purge again with inert gas;
- open the circuit by cutting or brazing;
• The refrigerant charge shall be recovered into the correct recovery
cylinders.
• The system shall be “Flushed” with OFN to render the unit safe.
• This process may need to be repeated several times.
• Compressed air or oxygen shall not be used for purging refrigerant
systems.
• Flushing shall be achieved by breaking the vacuum in the system
with OFN and continuing to fill until the working pressure is
achieved, then venting to atmosphere, and finally pulling down to a
vacuum.
• This process shall be repeated until no refrigerant is within the
system.
• When the final OFN charge is used, the system shall be vented
down to atmospheric pressure to enable work to take place.
• This operation is absolutely vital if brazing operations on the pipe-
work are to take place.
• Ensure that the outlet for the vacuum pump is not close to any
ignition sources and that ventilation available.
16. Charging procedures
• In addition to conventional charging procedures, the following
requirements shall be followed.
- Ensure that contamination of different refrigerants does not occur
when using charging equipment.
- Hoses or lines shall be as short as possible to minimize the
amount of refrigerant contained in them.
- Cylinders shall be kept upright.
- Ensure that the refrigeration system is earthed prior to charging
the system with refrigerant.
- Label the system when charging is complete (if not already).
- Extreme care shall be taken not to overfill the refrigeration
system.
• Prior to recharging the system, it shall be pressure-tested with the
appropriate purging gas.
• The system shall be leak tested on completion of charging but prior
to commissioning.
• A follow up leak test shall be carried out prior to leaving the site.
17. Decommissioning
• Before carrying out this procedure, it is essential that the technician
is completely familiar with the equipment and all its details.
• It is recommended good practice that all refrigerants are recovered
safely.
• Prior to the task being carried out, an oil and refrigerant sample
shall be taken in case analysis is required to reuse of reclaimed
refrigerant.
• It is essential that electrical power is available before the task is
commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure that:
- Mechanical handling equipment is available, if required, for
handling refrigerant cylinders;
- All personal protective equipment is available and being used
correctly;
- The recovery process is supervised at all times by a competent
person;
- Recovery equipment and cylinders conform to the appropriate
standards.
d) Pump down refrigerant system, if possible.
OM_D0X7303301-01_EN_Print.book Page 12 Friday, May 19, 2023 6:48 PM

– 13 –
e) If a vacuum is not possible, make a manifold so that refrigerant
can be removed from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery
takes place.
g) Start the recovery machine and operate in accordance with
manufacturer's instructions.
h) Do not overfill cylinders. (No more than 80 % volume liquid
charge).
i) Do not exceed the maximum working pressure of the cylinder,
even temporarily.
j) When the cylinders have been filled correctly and the process
completed, make sure that the cylinders and the equipment are
removed from site promptly and all isolation valves on the
equipment are closed off.
k) Recovered refrigerant shall not be charged into another
refrigeration system unless it has been cleaned and checked.
18. Labelling
• Equipment shall be labelled stating that it has been
decommissioned and emptied of refrigerant.
• The label shall be dated and signed.
• Ensure that there are labels on the equipment stating the
equipment contains flammable refrigerant.
19. Recovery
• When removing refrigerant from a system, either for servicing or
decommissioning, it is recommended good practice that all
refrigerants are removed safely.
• When transferring refrigerant into cylinders, ensure that only
appropriate refrigerant recovery cylinders are employed.
• Ensure that the correct number of cylinders for holding the total
system charge are available.
• All cylinders to be used are designated for the recovered
refrigerant and labelled for that refrigerant (i.e. special cylinders for
the recovery of refrigerant).
• Cylinders shall be complete with pressure-relief valve and
associated shut-off valves in good working order.
• Empty recovery cylinders are evacuated and, if possible, cooled
before recovery occurs.
• The recovery equipment shall be in good working order with a set
of instructions concerning the equipment that is at hand and shall
be suitable for the recovery of all appropiated refrigerants.
• In addition, a set of calibrated weighing scales shall be available
and in good working order.
• Hoses shall be complete with leak-free disconnect couplings and in
good condition.
• Before using the recovery machine, check that it is in satisfactory
working order, has been properly maintained and that any
associated electrical components are sealed to prevent ignition in
the event of a refrigerant release.
• Consult manufacturer if in doubt.
• The recovered refrigerant shall be returned to the refrigerant
supplier in the correct recovery cylinder, and the relevant waste
transfer note arranged.
• Do not mix refrigerants in recovery units and especially not in
cylinders.
• If compressors or compressor oils are to be removed, ensure that
they have been evacuated to an acceptable level to make certain
that flammable refrigerant does not remain within the lubricant.
• The evacuation process shall be carried out prior to returning the
compressor to the suppliers.
• Only electric heating to the compressor body shall be employed to
accelerate this process.
• When oil is drained from a system, it shall be carried out safely.
25-EN 26-EN
OM_D0X7303301-01_EN_Print.book Page 13 Friday, May 19, 2023 6:48 PM

– 122 –
EN
2Applicable controls
REQUIREMENT
When the air conditioner is used for the first time, it will
take some moments after the power has been turned on
before the remote controller becomes available for
operations: This is normal and is not indicative of
trouble.
• Concerning the automatic addresses (The automatic
addresses are set up by performing operations on the
outdoor interface circuit board.)
While the automatic addresses are being set up, no
remote controller operations can be performed. Setup
takes up to 10 minutes (usually about 5 minutes).
• When the power is turned on after automatically
address setup, it takes up to 10 minutes (usually
about 3 minute) for the outdoor unit to start operating
after the power has been turned on.
Before the air conditioner was shipped from the factory,
all units are set to [STANDARD] (factory default). If
necessary, change the indoor unit settings.
The settings are changed by operating the wired remote
controller.
* The settings cannot be changed using only a wireless
remote controller and simple remote controller by itself
so install a wired remote controller separately as well.
Applicable controls setup
(settings at the site)
Remote controller model name:
RBC-ASCU11*
Basic procedure
Be sure to stop the air conditioner before making
settings.
(Change the setup while the air conditioner is not
working.)
CAUTIONCAUTION
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.
1 Push and hold menu button and [ ] setting
button simultaneously for 10 seconds or more.
• After a while, the display flashes as shown in the
figure. "ALL" is displayed as indoor unit numbers
during initial communication immediately after the
power has been turned on.
2Each time [ ] [ ] setting button is pushed,
indoor unit numbers in the group control
change cyclically. Select the indoor unit to
change settings for.
• The fan of the selected indoor unit runs. The
indoor unit can be confirmed for which to change
settings.
3Push OFF timer button to confirm the
selected indoor unit.
3,6
4,5 1 7
2,4,5
Indoor unit No.
Set data
Code No.
4Push the menu button to make Code No. [ ]
flash. Change Code No. [ ] with [ ] [ ]
setting button.
5Push the menu button to make Set data
[ ] flash. Change Set data [ ] with
[ ] [ ] setting button.
6 Push OFF timer button to complete the set up.
• To change other settings of the selected indoor
unit, repeat from Procedure 4.
7When all the settings have been completed,
push ON/OFF button to finish the settings.
(Return to the normal mode).
" " flashes and then the display content
disappears and the air conditioner enters the
normal stop mode. (The remote controller is
unavailable while " " is flashing.)
• To change settings of another indoor unit, repeat
from Procedure 1.
Filter sign setting
According to the installation condition, the filter sign term
(Notification of filter cleaning) can be changed. Follow to
the basic operation procedure
(1→2→3→4→5→6→7).
• Specify [01] for the Code No. in Procedure 4.
• For the set data in Procedure 5, select the set data of
filter sign term from the following table.
• The filter sign may be unavailable depending on the
remote controllers.
External static pressure
settings
To set the external static pressure, refer to the "Fan
characteristics" in 6 Duct design.
Set up a tap change based upon the external static
pressure of the duct to be connected.
To set up a tap change, follow to the basic operation
procedure
(1→2→3→4→5→6→7).
• Specify [5d] for the Code No. in procedure 4.
• For the set data of procedure 5, select a set data of
the external static pressure to be set up from the
following table.
Remote controller-less setting
Change the external static pressure setting with the DIP
switch on the P.C. board.
• Once the Set data has been changed, though it can
be to reset it to 0000 (factory default), it need
changing using remote controller (sold separately).
After setting has been completed, restart the air
conditioner.
To restore the factory defaults
To return the DIP switch settings to the factory defaults,
set SW501-1 and SW501-2 to OFF, connect a
separately sold wired remote controller, and then set the
data of Code No. [5d] to “0000”.
Set data Filter sign term
0000 None
0001 150 H
0002 2500 H
(Factory default)
0003 5000 H
0004 10000 H
Set data External static pressure
0000 10Pa Standard (Factory default)
0001 20Pa High static pressure 1
0003 30Pa High static pressure 2
0004 40Pa High static pressure 3
0006 50Pa High static pressure 4
SW501-1 OFF ON OFF ON
SW501-2 OFF OFF ON ON
Set data
0000
Factory
default
0001 0003 0006
SW501-1
MCU (IC501)
SW501-2
27-EN 28-EN
OM_D0X7303301-01_EN_Print.book Page 122 Friday, May 19, 2023 6:48 PM

– 123 –
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 or other machinery to
circulate heat air near the ceiling.
Follow to the basic operation procedure
(1→2→3→4→5→6→7).
• Specify [06] for the Code No. in Procedure 4.
• For the set data in Procedure 5, select the set data of
shift value of detection temperature to be set up from
the following table.
Remote controller sensor
The temperature sensor of the indoor unit senses room
temperature usually. Set the remote controller sensor to
sense the temperature around the remote controller.
Select items following the basic operation procedure
(1→2→3→4→5→6→7).
• Specify [32] for the Code No. in Procedure 4.
• Select the following data for the set data in
Procedure 5.
When flashes, the remote controller sensor is
defective.
Select the set data [0000] (not in use) or replace the
remote controller.
Group control
In a group control, a remote controller can control up to
maximum 8 or 16 units. (Depending on the outdoor
unit.)
• The wired remote controller only can control a group
control. The wireless remote controller is unavailable
for this control.
• For wiring procedure and wires of the individual line
(Identical refrigerant line) system, refer to “8 Electrical
connection” in this Manual.
• Wiring between indoor units in a group is performed in
the following procedure.
• Connect the indoor units by connecting the remote
controller wires from the remote controller terminal
blocks (A, B) of the indoor unit connected with a
remote controller to the remote controller terminal
blocks (A, B) of the other indoor unit. (Non-polarity)
• For address setup, refer to the Installation Manual
attached to the outdoor unit.
Set data Detection temperature shift value
0000 No shift
0001 +1 °C
0002 +2 °C
(Factory default)
0003 +3 °C
0004 +4 °C
0005 +5 °C
0006 +6 °C
Set data 0000 0001
Remote controller
sensor
Not in use
(Factory default) In use
3Test run
Before test run
• Before turning on the circuit breaker, carry out the
following procedure.
1) By using insulation tester (500V Megger), check
that resistance of 1 MΩor more exists between the
terminal block L to N and the earth (grounding).
If resistance of less than 1 MΩis 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 for operating.
• Before starting a test run, be sure to set addresses
following the Installation Manual supplied with the
outdoor unit.
Execute a test run
• When a fan operation is to be performed for an
individual indoor unit, turn off the power, short circuit
CN72 on the circuit board, and then turn the power
back on. (Set the operation mode to "fan" to operate
the unit.) When the test run has been performed using
this method, be sure to release the short circuit of
CN72 after the test run is completed.
Operate the unit with the remote controller as usual.
For the procedure of the operation, refer to the Owner’s
Manual attached to the outdoor unit.
A forced test run can be executed in the following
procedure even if the operation stops by thermostat-
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.
CAUTIONCAUTION
• Do not use the forced test run for cases other than the
test run because it applies an excessive load to the
devices.
Wired remote controller
Be sure to stop the air conditioner before making
settings.
(Change the setup while the air conditioner is not working.)
1Push and hold OFF timer button and [ ]
setting button simultaneously for 10 seconds
or more. [TEST] is displayed on the display
part and the test run is permitted.
2Push ON/OFF button.
3Push menu button to select the operation
mode. Select [ Cool] or [ Heat] with [ ]
[ ] setting button.
• Do not run the air conditioner in a mode other
than [Cool] or [Heat].
• The temperature setting function does not work
during test run.
• The check code is displayed as usual.
4After the test run, push OFF timer button to
stop a test run.
([TEST] disappears on the display and the air
conditioner enters the normal stop mode.)
4
31 2
3
29-EN 30-EN
OM_D0X7303301-01_EN_Print.book Page 123 Friday, May 19, 2023 6:48 PM

– 124 –
EN
Wired remote controller
1Turn on the power of the air conditioner.
When power is turned on for the first time
after installation, it takes approx. 5 minutes
until the remote controller becomes available.
In the case of subsequent poweron, it takes
approx. 1 minute until the remote controller
becomes available. Execute a test run after
the predetermined time has passed.
2Push “ON/OFF” button on the remote
controller, select [ Cool] or [ Heat] with
“MODE” button, and then select
[ HIGH] with “FAN” button.
3
4
5
6Repeat procedures 4→5→4→5.
Indicators “Operation” (green), “Timer”
(green), and “Ready” (orange) in the wireless
receiver section flash in approx. 10 seconds,
and the air conditioner starts operation. If any
of these indicators does not flash, repeat
procedures 2 to 5.
7Upon completion of the test run, push “ON/
OFF” button to stop operation.
<Overview of test run operations using the wireless
remote controller>
▼Cooling test run:
ON/OFF → 17°C → 18°C → 17°C → 18°C → 17°C →
18°C → 17°C → (test run) → ON/OFF
▼Heating test run:
ON/OFF → 30°C → 29°C → 30°C → 29°C → 30°C →
29°C → 30°C → (test run) → ON/OFF
Cooling test run Heating test run
Set the temperature to 17°C
with the temp. setup buttons.
Set the temperature to 30°C
with the temp. setup buttons.
Cooling test run Heating test run
After confirming a signal
receiving sound “beep”
immediately set the
temperature to 18°C with the
temp. setup buttons.
After confirming a signal
receiving sound “beep”
immediately set the
temperature to 29°C with the
temp. setup buttons.
Cooling test run Heating test run
After confirming a signal
receiving sound “beep”
immediately set the
temperature to 17°C with the
temp. setup buttons.
After confirming a signal
receiving sound “beep”
immediately set the
temperature to 30°C with the
temp. setup buttons.
4Maintenance
CAUTIONCAUTION
• When connecting to an outdoor unit of R32 refrigerant
and using a leak detector,be sure to turn on the circuit
breaker after maintenance to detect the leakage of
refrigerant and take safety measures.
<Daily maintenance>
Cleaning of air filter
• Be sure to stop the air conditioner before cleaning of
air filter, then turn off the circuit breaker.
1Take off the air filter.
When connecting a return air duct to the unit,
cleaning method of the air filter differs according to
the construction of duct end. Please ask the
constructor for construction of air duct.
• Slide and remove the filter as shown in the
following figure.
WARNING
When the first filter comes out without connected to the
other one, insert it once more to connect the two filters
together and pull out them as connected. Do not insert
hands to take out the second filter. You may injure
yourself.
2Cleaning 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.
3Mount the air filter.
Insert the filter into the rail in the direction of the
arrow as shown in the figure below until it reaches
the filter stopper.
CAUTIONCAUTION
• Do not start the air conditioner while leaving air filter
removed.
31-EN 32-EN
OM_D0X7303301-01_EN_Print.book Page 124 Friday, May 19, 2023 6:48 PM

– 125 –
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.
Maintenance List
Parts 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 Access from check port 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.
Parts 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
• Wash the filter with water when it is
contaminated.
• Replace it when it is damaged.
Fan Indoor
• Vibration, balance
• Dust / dirt, appearance
• Replace the fan when vibration or
balance is terrible.
• 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.
Ceiling panel, louvres Indoor Dust / dirt, scratches Wash them when they are contaminated or
apply repair coating.
Exterior Outdoor • Rust, peeling of insulator
• Peeling / lift of coat Apply repair coating.
5Troubleshooting
Confirmation and check
Troubleshooting history and confirmation
You can check the troubleshooting history with the following procedure if a problem occurs with the air conditioner.
(The troubleshooting history records up to 4 incidents.)
You can check it during operation or when operation is stopped.
• If you check the troubleshooting history during OFF timer operation, the OFF timer will be canceled.
Procedure Description of operation
1
Push the OFF timer button for over 10 seconds and the
indicators appear as an image indicating the troubleshooting
history mode has been entered. If [ Service check] is
displayed, the mode enters in the troubleshooting history mode.
• [01: Order of troubleshooting history] appears in the
temperature indicator.
• The OFF timer indicator alternately shows the [check code]
and the [indoor Unit No. ] in which the problem occurred.
2
Each time the setting button is pushed, the recorded
troubleshooting history is displayed in sequence.
The troubleshooting history appears in order from [01] (newest)
to [04] (oldest).
CAUTIONCAUTION
In the troubleshooting history mode, DO NOT push the Menu
button for over 10 seconds, doing so deletes the entire
troubleshooting history of the indoor unit.
3
After you have finished checking, push the ON/OFF button to
return to the regular mode.
• If the air conditioner is operating, it remains operated even
after the ON/OFF button has been pushed.
To stop its operation, push the ON/OFF button again.
Check code The indoor Unit No. in which
the problem occurred.
If a problem occurs with the air
conditioner, the OFF timer indicator
alternately shows the check code and
the indoor Unit No. in which the
problem occurred.
312
33-EN 34-EN
OM_D0X7303301-01_EN_Print.book Page 125 Friday, May 19, 2023 6:48 PM

– 126 –
EN
Check 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 / trouble 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
trouble No signal can be received from the indoor unit.
E02 Remote controller
transmission trouble Remote controller
Indoor / outdoor connecting wires, indoor P.C. board,
remote controller
--- No signal can be sent to the indoor unit. *
E03
Indoor unit-remote
controller regular
communication
trouble
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
trouble Indoor Indoor / outdoor connecting wires, indoor P.C. board,
outdoor P.C. board --- Serial communication trouble
between indoor unit and outdoor unit
Auto-
reset
IPDU-CDB
communication
trouble
E08 Duplicated indoor
addresses Indoor Indoor address setting trouble --- The same address as the self-address was detected. Auto- reset
E09 Duplicated header
remote controllers Remote controller
Remote controller address setting trouble --- 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.)
E10 CPU-CPU communication
trouble Indoor Indoor P.C. board --- Communication trouble between
main MCU and motor microcomputer MCU Auto- reset
E11
Communication
trouble between
Application control kit
and Indoor unit
Indoor Communication trouble between Application control
kit and Indoor unit Entire stop
E18
Header unit follower
unit regular
communication
trouble
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
trouble Outdoor Communication trouble between IPDU and CDB Entire
stop
T
L
A
10F Indoor unit heat
exchanger sensor
(TCJ) trouble Indoor Heat exchanger sensor (TCJ), indoor P.C. board ---
Open-circuit or short-circuit of the heat exchanger
sensor (TCJ) was detected.
Auto-
reset
TLA20F Indoor unit heat exchanger sensor
(TC) trouble Indoor Heat exchanger sensor (TC), indoor P.C. board ---
Open-circuit or short-circuit of the heat exchanger
sensor (TC) was detected.
Auto-
reset
TLA40F Outdoor unit discharge temp.
sensor (TD) trouble Outdoor Outdoor temp. sensor (TD), outdoor P.C. board ---
Open-circuit or short-circuit of the discharge temp.
sensor was detected.
Entire
stop
TL
A
6
0
FOutdoor unit temp.
sensor (TE / TS)
trouble 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
r
o
odtuOelbuortrosnesLTTLA70F TL sensor may be displaced, disconnected or short-
circuited. Entire
stop
TLA8
0F Outdoor unit outside
air temp. sensor
trouble Outdoor Outdoor temp. sensor (TO), outdoor P.C. board ---
Open-circuit or short-circuit of the outdoor air temp.
sensor was detected.
Operation
continued
T
L
A
01F Indoor unit room
temp. sensor (TA)
trouble Indoor Room temp. sensor (TA), indoor P.C. board --- Open-
circuit or short-circuit of the room temp. sensor (TA)
was detected.
Auto-
reset
roodtuOelbuortrosnesSTTLA21F TS sensor may be displaced, disconnected or short-
circuited. Entire stop
TLA31F Heat sink sensor
trouble Outdoor Abnormal temperature was detected by the temp.
sensor of the IGBT heat sink. Entire stop
TLA51F Temp. sensor
connection trouble Outdoor Temp. sensor (TE / TS) may be connected incorrectly. Entire stop
MIS92F Indoor unit, other P.C.
board trouble Indoor Indoor P.C. board --- EEPROM trouble Auto- reset
MI
S
03F Occupancy sensor
trouble Indoor Abnormality was detected from occupancy sensor. Operation continued
M
I
S
1
3F Outdoor unit P.C.
board Outdoor Outdoor P.C. board ---- In the case of EEPROM trouble. 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 trouble 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 low- pressure system
trouble Outdoor Current, high-pressure switch circuit, outdoor P.C.
board --- Pressure sensor trouble was detected or
low-pressure protective operation was activated.
Entire
stop
MIS30L Duplicated header
indoor units Indoor Indoor address setting trouble --- There are two or more header units in the group. Entire stop
MIS70L Group line in individual indoor unit Indoor Indoor address setting trouble --- There is at least one group-connected indoor unit among individual indoor
units.
Entire
stop
MI
S8
0
LIndoor group address
not set Indoor Indoor address setting trouble --- Indoor address group has not been set. Entire
stop
MI
S
90L Indoor unit capacity
not set Indoor Indoor unit capacity has not been set. Entire stop
MIS01L Outdoor unit P.C.
board Outdoor In the case of outdoor P.C. board jumper wire (for service) setting trouble Entire stop
MIS0
2L LAN communication
trouble
Network
adapter
central
control
Address setting, central control remote controller,
network adapter --- Duplication of address in central
control communication
Auto-
reset
MI
S
92L Other outdoor unit
trouble Outdoor
Other outdoor unit trouble Entire
stop
1) Communication trouble between IPDU MCU and
CDB MCU Entire
stop
2) Abnormal temperature was detected by the heat
sink temp. sensor in IGBT.
M
IS03L 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
MIS
1
3L Phase sequence
trouble, etc. Outdoor Power supply phase sequence, outdoor unit P.C.
board --- Abnormal phase sequence of the 3-phase
power supply
Operation
continued
(thermost
at OFF)
roo
d
n
I
elbu
or
tna
f
tinuro
o
d
n
ITL
A
10P Indoor fan motor, indoor P.C. board --- Indoor AC fan trouble (fan motor thermal relay activated) was
detected.
Entire
stop
T
LA30P Outdoor unit
discharge temp.
trouble Outdoor An trouble was detected in the discharge temp.
releasing control. Entire stop
Wired
remote
controller
display
Wireless remote controller
Sensor block display of
receiving unit Main defective parts Judging
device Parts to be checked / trouble description Air
conditioner
status
Indication Operation Timer
Ready
GR GR OR
Flashing
35-EN 36-EN
OM_D0X7303301-01_EN_Print.book Page 126 Friday, May 19, 2023 6:48 PM

– 127 –
: 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
TL
A40P Outdoor unit high-
pressure system
trouble Outdoor High-pressure switch --- The IOL was activated or an
trouble was detected in the high-pressure releasing
control using the TE.
Entire
stop
ro
o
dtuOde
t
cetedesahpnep
O
TLA50P The power wire may be connected incorrectly. Check
open phase and voltages of the power supply. Entire stop
roodtu
O
tae
hr
e
v
okni
s
taeHTL
A
7
0
PAbnormal temperature was detected by the temp.
sensor of the IGBT heat sink. Entire stop
T
LA01P 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
T
L
A
2
1P The fan trouble 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
TL
A51P Gas leakage
detected Outdoor There may be gas leakage from the pipe or
connecting part. Check for gas leakage. Entire
stop
elbuortevlav
y
aw-4
T
LA91P Outdoor
(Indoor)
4-way valve, indoor temp. sensors (TC / TCJ) --- An
trouble was detected due to temperature drop of the
indoor unit heat exchanger sensor when heating.
Auto-
reset
TLA02P High-pressure
protective operation Outdoor High-pressure protection Entire stop
TLA22P Outdoor unit fan
trouble Outdoor Outdoor unit fan motor, outdoor unit P.C. board --- An
trouble (overcurrent, locking, etc.) was detected in the
outdoor unit fan drive circuit.
Entire
stop
TL
A6
2P 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
TL
A92P Outdoor unit position
trouble Outdoor Outdoor unit P.C. board, high-pressure switch --- Compressor motor position trouble was detected. Entire stop
TLA13P Other indoor unit
trouble Indoor
Another indoor unit in the group is raising an alarm. Entire
stop
E03/L07/L03/L08 alarm check locations and trouble
description Auto- reset
Wired
remote
controller
display
Wireless remote controller
Sensor block display of
receiving unit Main defective parts Judging
device Parts to be checked / trouble description Air
conditioner
status
Indication Operation Timer
Ready
GR GR OR
Flashing
37-EN 38-EN
OM_D0X7303301-01_EN_Print.book Page 127 Friday, May 19, 2023 6:48 PM