Toshiba Air Conditioner RAV SM2242DT E User Manual
AIR CONDITIONER (SPLIT TYPE)  
Installation Manual  
Indoor Unit  
Model name:  
Concealed Duct High Static Pressure Type  
RAV-SM2242DT-E  
RAV-SM2802DT-E  
Installation Manual  
Air conditioner (Split type)  
English  
Français  
Deutsch  
Italiano  
Español  
1
41  
81  
Manuel d’installation  
Climatiseur (Type split)  
Installationsanleitung  
Klimagerät (Split-typ)  
Manuale di installazione  
Condizionatore d’aria (Tipo split)121  
Manual de instalación  
Aire acondicionado (Tipo split) 161  
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Installation Manual  
Concealed Duct High Static Pressure  
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.  
Some of the details provided in these instructions differ from the Installation Manual supplied with your product, and the  
instructions provided here take precedence.  
After reading these instructions, be sure to keep them in a safe place together with the Owner’s Manual and Installation Manual  
supplied with your product.  
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  
• 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.  
Qualified installer  
• 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.  
EN  
• 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.  
• 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.  
Qualified service  
person  
• 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.  
– 2 –  
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2-EN  
Installation Manual  
Concealed Duct High Static Pressure  
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  
Protective gloves  
‘Safety’ working clothing  
All types of work  
Gloves to provide protection for electricians and from heat  
Insulating shoes  
Clothing to provide protection from electric shock  
Electrical-related  
work  
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  
3-EN  
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 Warning Indications on the Air Conditioner Unit  
Warning indication  
Description  
WARNING  
WARNING  
ELECTRICAL SHOCK HAZARD  
Disconnect all remote electric power supplies before servicing.  
ELECTRICAL SHOCK HAZARD  
Disconnect all remote  
electric power supplies  
before servicing.  
WARNING  
WARNING  
Moving parts.  
Moving parts.  
Do not operate unit with grille removed.  
Stop the unit before the servicing.  
Do not operate unit with grille  
removed.  
Stop the unit before the servicing.  
CAUTION  
CAUTION  
EN  
High temperature parts.  
You might get burned  
when removing this panel.  
High temperature parts.  
You might get burned when removing this panel.  
CAUTION  
CAUTION  
Do not touch the aluminum  
fins of the unit.  
Doing so may result in injury.  
Do not touch the aluminium fins of the unit.  
Doing so may result in injury.  
CAUTION  
CAUTION  
BURST HAZARD  
Open the service valves before  
the operation, otherwise there  
might be the burst.  
BURST HAZARD  
Open the service valves before the operation, otherwise there might be the  
burst.  
– 4 –  
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4-EN  
Installation Manual  
Concealed Duct High Static Pressure  
1 PRECAUTIONS FOR SAFETY  
WARNING  
General  
• Before starting to install the air conditioner, read carefully through the Installation Manual, and follow its instructions to install  
the air conditioner.  
• Only a qualified installer(*1) or qualified service person(*1) is allowed to install the air conditioner. If the air conditioner is  
installed by an unqualified individual, a fire, electric shocks, injury, water leakage, noise and/or vibration may result.  
• 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, 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.  
• 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.  
• Wear protective gloves and safety work clothing during installation, servicing and removal.  
• Do not touch the aluminium fin of the outdoor 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 working 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.  
• When 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.  
• When 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.  
• The refrigerant used by this air conditioner is the R410A.  
• You shall ensure that the air conditioner is transported in stable condition.  
• 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.  
Selection of installation location  
• If you install the unit in a small room, take appropriate measures to prevent the refrigerant from exceeding the limit  
concentration even if it leaks. Consult the dealer from whom you purchased the air conditioner when you implement the  
measures. Accumulation of highly concentrated refrigerant may cause an oxygen deficiency accident.  
• 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.  
• When transporting the air conditioner, wear shoes with additional protective toe caps.  
• When transporting 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.  
Installation  
• 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.  
• Install the air conditioner at enough strong places to withstand the weight of the unit. 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, etc.  
• The designated bolts (M10, M12) and nuts (M10, M12) for securing the outdoor unit must be used when installing the unit.  
• Install the outdoor unit property in a location that is durable enough to support the weight of the outdoor unit. Insufficient  
durability may cause the outdoor unit to fall, which may result in injury.  
5-EN  
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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.  
• 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 be generated.  
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.  
• When connecting the electrical wires, repairing the electrical parts or undertaking 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.  
• Be sure to connect earth wire. (Grounding work)  
Incomplete grounding causes an electric shock.  
• Do not connect ground wires to gas pipes, water pipes, and lightning rods or ground wires for telephone wires.  
• After completing the repair or relocation work, check that the ground 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.  
EN  
• 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 must the power cable be extended. Connection trouble in the places where the cable 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 parts 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.  
• When you have noticed that some kind of trouble (such as when an error display has appeared, there is a smell of burning,  
abnormal sounds are heard, 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, etc.  
• After the work has finished, be sure to use an insulation tester set (500V Megger) to check the resistance is 2 M! 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 you have discovered that 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.  
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, etc. 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.”  
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6-EN  
Installation Manual  
Concealed Duct High Static Pressure  
CAUTION  
New Refrigerant Air Conditioner Installation  
• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY OZONE  
LAYER.  
• The characteristics of R410A refrigerant are; easy to absorb water, oxidizing membrane or oil, and its pressure is approx.  
1.6 times higher than that of refrigerant R22. Accompanied with the new refrigerant, refrigerating oil has also been changed.  
Therefore, during installation work, be sure that water, dust, former refrigerant, or refrigerating oil does not enter the  
refrigerating cycle.  
• To prevent charging an incorrect refrigerant and refrigerating oil, the sizes of connecting sections of charging port of the  
main unit and installation tools are changed from those for the conventional refrigerant.  
• Accordingly the exclusive tools are required for the new refrigerant (R410A).  
• For connecting pipes, use new and clean piping designed for R410A, and please care so that water or dust does not enter.  
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 must be used for the power supply line of this conditioner.  
7-EN  
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2 ACCESSORY PARTS  
Part name  
Q’ty  
Shape  
Usage  
(Be sure to hand over to customers)  
(For other languages that do not appear in this Installation Manual,  
please refer to the enclosed CD-R.)  
Installation Manual  
2
This manual  
Owner’s Manual  
1
(Be sure to hand over to customers)  
1
1
For heat insulation of Gas pipe connecting section  
For heat insulation of Liquid pipe connecting section  
Heat insulator  
Joint (Ø22.2 – Ø28.6 mm)  
1
For connecting the gas side pipe  
EN  
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8-EN  
Installation Manual  
Concealed Duct High Static Pressure  
3 SELECTION OF INSTALLATION PLACE  
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.  
• Place exposed to air with high salt content (seaside area), or place exposed to large quantities of sulfide gas (hot spring).  
(Should the unit be used in these places, special protective measures are needed.)  
• A restaurant kitchen where a lot of oil is used or place near machines in a factory (Oil adhering to the heat exchanger and  
resin part (fan) in the indoor unit may reduce the performance, generate mist or dew drop, or deform or damage resin parts.)  
• Place where organic solvent is used nearby.  
• Place close to a machine generating high frequency.  
• Place where the discharged air blows directly into the window of the neighbour house. (Outdoor unit)  
• Place where noise of the outdoor unit is easily transmitted.  
(When install the outdoor unit on the boundary with the neighbour, pay due attention to the level of noise.)  
• Place with poor ventilation. (Before air duct installation, check whether value of air volume, static pressure and duct  
resistance are correct.)  
• Do not use the air conditioner for special purposes such as preserving food, precision instruments, or art objects, or where  
breeding animals or growing plants are kept. (This may degrade the quality of preserved materials.)  
• Place where any of high-frequency appliances (including inverter devices, private power generators, medical equipment, and  
communication equipment) and inverter-type fluorescent light is installed.  
(A malfunction of the air conditioner, abnormal control, or problems due to noise to such appliances/equipment may occur.)  
• When the wireless remote controller is used in a room equipped with an inverter-type fluorescent light or at a place exposed  
to direct sunlight, signals from the remote controller may not be received correctly.  
• Place where organic solvent is used.  
• Place where special spray is used frequently.  
 Installation under high-humidity atmosphere  
In some cases including the rainy season, especially inside of the ceiling may become high-humidity atmosphere (dew-point  
temperature: 23°C or higher).  
1. Installation to inside of the ceiling with tiles on the roof  
2. Installation to inside of the ceiling with slated roof  
3. Installation to a place where inside of the ceiling is used for pathway to intake the fresh air  
• In the above cases, additionally attach the heat insulator to all positions of the air conditioner, which come to contact with the  
high-humidity atmosphere. In this case, arrange the side plate (Check port) so that it is easily removed.  
• Apply also a sufficient heat insulation to the duct and connecting part of the duct.  
[Reference]  
Condensation test conditions  
27°C dry bulb temperature  
24°C wet bulb temperature  
Indoor side:  
Air volume:  
Low air volume, operation time 4 hours  
9-EN  
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(Unit: mm)  
Concealed Duct High Static Pressure  
 Installation space  
Reserve space required for maintenance the indoor unit and service work.  
200 or more Servicing space  
Concealed duct high  
static pressure  
1000 or more  
Check port with carrying  
in port 600x600  
Air flow direction  
<Installation example>  
Concealed  
duct high static  
pressure  
Filter chamber  
Air inlet chamber  
Air outlet chamber  
EN  
Duct hose  
Duct hose  
Duct hose  
Air flow direction  
REQUIREMENT  
1. Attach the optional accessories (drain-up kit etc.) on the unit before installing the unit. Also, set the check port with carrying  
in port to the side surface of the unit except air inlet panel.  
2. Prepare the check port with carrying in port hole with the size of 600x600mm.  
 Filter cleaning sign term setting  
The lighting term setup of the filter sign (Notification of filter cleaning) of the remote controller can be changed according to the  
condition of installation.  
For setup method, refer to “Filter sign setting” and “To secure better effect of heating” in the Applicable controls of this Manual.  
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Concealed Duct High Static Pressure  
4 INSTALLATION  
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, hold the hooking metals (4 positions) only.  
Do not apply force to the other parts (refrigerant pipe, drain pan, foamed parts, or resin parts, etc.).  
• Hanging bolt pitch of air inlet chamber side is different (centre position), make sure not to make mistake to install the setting  
direction.  
• Carry the package by two or more persons, and do not bundle it with plastic band at positions other than specified.  
 External Dimensions  
(Unit: mm)  
4-M10 hanging bolt  
(Local procure)  
1288 (Hanging bolt pitch)  
1328  
Electrical control box  
Refrigerant pipe connecting port  
(Gas side Ø22.2 Brazed)  
Refrigerant pipe connecting port  
(Liquid side Ø12.7 Flared)  
1250  
22  
Drain pipe  
connecting port  
624  
698  
46  
65  
11-EN  
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 Installation of hanging bolt  
 Installation of indoor unit  
• Consider the piping/wiring after the unit is hung when  
determining the location of the indoor unit installation and  
orientation.  
Treatment of ceiling  
The ceiling differs according to structure of building.  
For details, consult your constructor or interior finish  
contractor.  
• After the location of the indoor unit installation has been  
determined, install hanging bolts.  
• For the dimensions of the hanging bolt pitches, refer to the  
external view.  
In the process after the ceiling board has been removed, it is  
important to reinforce ceiling foundation (frame) and to keep  
horizontal level of installed ceiling correctly in order to  
prevent vibration of ceiling board.  
• When a ceiling already exists, lay the drain pipe,  
refrigerant pipe, system interconnection wires, and remote  
controller wires to their connection locations before  
hanging the indoor unit.  
• Attach the nuts and the M10 flat washers to the hanging  
bolt.  
Procure hanging bolts washer and nuts for installing the  
indoor unit (these are not supplied).  
• Put washers at up and down of the hanging bracket of the  
indoor unit to hang down the indoor unit.  
• Using a level vial, check that four sides are horizontal.  
(Horizontal degree: Within 5mm)  
Hanging bolt  
Nut  
M10 or W3/8  
M10 or W3/8  
M10  
4 pieces  
12 pieces  
8 pieces  
Washer  
Hanging bolt  
(W3/8 or M10)  
M10 flat washer  
Installation of hanging bolt  
Nut  
(W3/8 or M10)  
Use M10 hanging bolts (4 pcs, to be local procure).  
Matching to the existing structure, set pitch according to size  
in the unit external view as shown below.  
M10 flat washer  
Nut  
(W3/8 or M10)  
EN  
New concrete slab  
Install the bolts with insert brackets or anchor bolts.  
• Check that four sides are horizontal using a level vial.  
(Horizontal degree: Within 5mm)  
Rubber  
Anchor bolt  
REQUIREMENT  
(Slide type  
bracket)  
(Blade type  
bracket)  
(Pipe hanging  
anchor bolt)  
• Hang the unit in a horizontal position.  
When unit is hanged to slant, it may cause overflow of  
drainage.  
Steel flame structure  
• Install the unit within the dimension according to the figure  
below.  
Use existing angles or install new support angles.  
Hanging bolt  
• Using level vial or vinyl hose to confirm whether the unit  
is hang horizontally.  
Side view  
Front view  
Support angle  
Hanging bolt  
Water pouring  
Vinyl hose  
Existing concrete slab  
Use a hole-in anchors, hole-in plugs, or a hole-in bolts.  
Set the air inlet and air  
outlet sides are within  
5mm with each other.  
Set the drain pipe  
connecting port side within  
5mm lower than opposite  
side.  
– 12 –  
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12-EN  
Installation Manual  
(Unit: mm)  
Concealed Duct High Static Pressure  
 Diagrams for making connecting flanges  
The connecting flange (Incl. the fixing screw) is not supplied to the indoor unit. When the connecting flange is necessary,  
produce them in locally.  
Drawing figure is as follows. (Material: Galvanized steel plate, thickness of 1.6 mm)  
<Air outlet port flange>  
1130  
65  
250  
250  
250  
250  
65  
1080  
25  
25  
10-Ø8 hole  
<Air inlet port connecting flange>  
1130  
65  
250  
250  
250  
250  
65  
1080  
25  
25  
10-Ø8 hole  
13-EN  
– 13 –  
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 Duct design  
1. In order to prevent short circuits, design the duct installation, so that the intake and discharge openings are not  
adjacent to each other.  
2. The indoor unit does not have a built-in air filter. Make sure to set up the filter chamber etc. and install the air filter (Locally  
procured). If no air filter is installed, the heat exchanger will be blocked by dust, which may cause the malfunction of air  
conditioner or the water leakage.  
<Duct installation example (First floor)>  
High efficiency filter  
Air outlet chamber  
inserting port  
(with heat insulation)  
Pre filter  
inserting port  
Air outlet port  
connecting flange  
Flexible duct hanging band  
Air inlet port  
connecting flange  
Indoor unit  
Duct hose (with heat insulation)  
Electrical control  
box  
Filter Air inlet  
chamber chamber  
EN  
Duct hose  
Air outlet port  
Air outlet port  
Ceiling  
Check port or carrying  
in port (600x600)  
Check port cap  
from ground floor  
to ground floor  
NOTE  
All duct connection between units except outdoor unit must be procured and enforced locally.  
– 14 –  
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14-EN  
Installation Manual  
Concealed Duct High Static Pressure  
5 FAN CHARACTERISTICS  
Current value as a criterion, adjust the air volume value to become within the range of the chart below.  
<RAV-SM2242 Type>  
Standard air volume: 3600m³/h  
8
7.5  
7
6.5  
High static pressure tap (50Hz)  
6
5.5  
5
Medium static pressure tap (50Hz)  
Low static pressure tap (50Hz)  
4.5  
4
300  
250  
200  
150  
100  
High static pressure tap (50Hz)  
Medium static pressure tap (50Hz)  
Low static pressure tap (50Hz)  
50  
5
2800  
3000  
3400  
3800  
4200 4400  
4000 4320  
2880  
Lower limit of air volume  
3200  
3600  
Air volume (m³/h)  
Upper limit of air volume  
15-EN  
– 15 –  
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Concealed Duct High Static Pressure  
<RAV-SM2802 Type>  
Standard air volume: 4200m³/h  
8.5  
8
7.5  
7
High static pressure tap (50Hz)  
6.5  
6
Medium static pressure tap (50Hz)  
Low static pressure tap (50Hz)  
5.5  
5
4.5  
4
350  
300  
250  
200  
150  
100  
EN  
High static pressure tap (50Hz)  
Medium static pressure tap (50Hz)  
50  
5
Low static pressure tap (50Hz)  
3200 3400  
3800  
4200  
4600  
5000 5200  
4800 5040  
3360  
3600  
4000  
4400  
Lower limit of air volume  
Air volume (m³/h)  
Upper limit of air volume  
REQUIREMENT  
Add a air volume damper to the air supply duct, and adjust the air volume in the range from 80% to 120% of the standard air  
volume.  
– 16 –  
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16-EN  
Installation Manual  
Concealed Duct High Static Pressure  
 Wire connection change of fan motor  
This duct is composed of 3 fan motors.  
To change external static pressure by duct resistance, connect the 3 connectors of the orange lead wires that are connected to  
the underside of the fan tap changing terminal block to the same number (F1, F2 or F3) terminal.  
The wires of the fan motor has been connected to (F2) [External static pressure 137Pa (14mmAq)] as factory default.  
YEL: Yellow  
BLU: Blue  
ORG: Orange  
Low static pressure (F1)  
FM  
FM  
Fan motor  
FM  
Fan motor  
Fan motor  
F
1
F
2
F
3
F
4
F
1
F
2
F
3
F
4
F
F
F
1
1
1
F
F
F
2
2
2
F
F
F
3
3
3
F4  
FAN2  
FAN1  
FAN3  
Standard (Middle) static pressure (F2)  
Fan tap changing  
terminal block  
Electrical control box  
FM  
FM  
FM  
Control  
P.C. board  
Fan motor  
Fan motor  
Fan motor  
4P terminal  
block  
F
1
F
2
F
3
F
4
F
1
F
2
F3  
F4  
F4  
3P terminal  
block  
FAN2  
FAN1  
FAN3  
2P terminal  
block  
High static pressure (F3)  
FM  
FM  
FM  
Fan motor  
Fan motor  
Fan motor  
F
1
F
2
F
3
F
4
F
1
F
2
F3  
F4  
F4  
FAN2  
FAN1  
FAN3  
External static pressure  
Pa (mmAq)  
Terminal block No.  
Fan motor wiring  
Remarks  
Yellow  
Low static pressure  
F1  
F2  
F3  
69 (7)  
Blue  
Middle static pressure  
137 (14)  
196 (20)  
Factory default  
Orange  
High static pressure  
* Do not use F4.  
NOTE  
When the external static pressure is changed, write down the static pressure once change in the wiring diagram of the indoor  
unit is made.  
17-EN  
– 17 –  
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6 DRAIN PIPING WORK  
CAUTION  
Following the Installation Manual, perform the drain piping work that water is properly drained, and apply a heat  
insulation not to cause a dew condensation.  
Inappropriate piping work may cause the water leakage in the room and wet of furniture.  
REQUIREMENT  
• The drain piping flows the natural drainage. Make sure to set the drain piping from the unit with descending slope of 1/50 to  
1/100 and do not make up-down or trap in the midway.  
• Set the horizontal pulling of the drain pipe to 20m or less. When drain piping is too long, attach the support bracket at  
intervals of 1.5m to 2m to avoid the pipe becomes undulant as shown in figure below.  
<Example for installation of the main piping (Incl. piping support)>  
As long as possible  
1.5 to 2 m  
Up-down bend  
Trap  
Descending slop of  
1/50 to 1/100  
VP-30  
Descending slop of  
1/50 to 1/100  
• Be sure to connect the drain pipe to the air conditioner with adhesive to avoid water leakage from the joint portion.  
• Condensation may occur on the drain pipes including collective pipes. All drain pipes must be wrapped with heat insulator  
to prevent dew condensation. Especially a part where drain pipe is connected to the indoor unit must be firmly insulated with  
the provided heat insulator.  
EN  
– 18 –  
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18-EN  
Installation Manual  
Concealed Duct High Static Pressure  
 Pipe material, size and insulator  
The following materials for piping work and insulating process are procured locally.  
Hard vinyl chloride pipe socket for VP25  
Pipe material  
Hard vinyl chloride pipe VP25 (Nominal outer diameter Ø32mm)  
Insulator  
Foamed polyethylene foam, thickness: 10mm or more  
 Connecting drain pipe  
REQUIREMENT  
• Using adhesive agent for vinyl chloride, connect the hard vinyl chloride pipes certainly so that water does not leak.  
• It takes some time to dry and indurate the adhesive agent. (Refer to the manual of adhesive agent.) Do not apply any extra  
force on the connecting section until the adhesive agent dried.  
 Drain up  
• When install the drain up kit of optional accessory, read the Installation Manual supplied to a drain up kit.  
19-EN  
– 19 –  
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Concealed Duct High Static Pressure  
 Check the draining  
Check if the water can flow out properly during the test run. Also, check if no water leakage from the piping connection port.  
REQUIREMENT  
• Do drain test even if installation of heating season.  
• Pour water into the drain pan port of the air inlet port gently using the kettle or hose when duct is not connected to the drain  
pipe. When duct is connected to the drain pipe, remove the Access plate and perform it.  
Access plate  
Pour into the drain pan with a hose or  
other materials.  
EN  
– 20 –  
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Installation Manual  
Concealed Duct High Static Pressure  
 Heat insulating process  
• After drain check, covering the heat insulator for drain connecting section, wrap the drain pipe with heat insulator (Locally  
procured) without clearance from the end of the drain pipe connecting port of the indoor unit.  
Heat insulation (Locally procured)  
Thickness 10mm or more  
Drain pipe connecting port  
Indoor unit  
21-EN  
– 21 –  
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Concealed Duct High Static Pressure  
7 REFRIGERANT PIPING AND EVACUATING  
Flaring  
 Refrigerant Piping  
• Cut the pipe with a pipe cutter.  
Remove burrs completely.  
1. If the outdoor units are to be mounted on a wall,  
make sure that the supporting platform is sufficiently  
strong. The platform should be designed and  
manufactured to maintain its strength over a long  
period of time, and sufficient consideration should  
be given to ensuring that the outdoor unit will not fall.  
2. Use general copper pipes with a wall thickness of 0.8  
mm for Ø12.7 mm, and with a wall thickness of 1.0  
mm for Ø28.6 mm (half hard).  
Remaining burrs may cause gas leakage.  
• Insert a flare nut into the pipe, and flare the pipe.  
As the flaring sizes of R410A differ from those of  
refrigerant R22, the flare tools newly manufactured for  
R410A are recommended.  
B
However, the conventional tools can  
be used by adjusting projection  
margin of the copper pipe.  
Do not use any copper pipes with a wall thickness  
less than these thicknesses.  
3. Flare nut and flare works are also different from those of  
the conventional refrigerant.  
M Projection margin in flaring: B (Unit: mm)  
Rigid (Clutch type)  
Take out the flare nut attached to the main unit of the air  
conditioner, and use it.  
Conventional tool  
used  
R410A tool used  
Outer dia. of  
copper pipe  
REQUIREMENT  
R410A  
R410A  
When the refrigerant pipe is long, provide support brackets at  
intervals of 2.5 to 3m to clamp the refrigerant pipe. Otherwise,  
abnormal sound may be generated.  
12.7  
0 to 0.5  
1.5 to 2.0  
EN  
M Flaring dia. meter size: A (Unit: mm)  
+0  
-0.02" (–0.4)  
A
CAUTION  
Outer dia. of copper pipe  
12.7  
R410A  
IMPORTANT 4 POINTS FOR PIPING WORK  
1. Remove dust and moisture from the inside of the  
connecting pipes.  
16.6  
* In case of flaring for R410A with the  
A
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.  
2. Tight connection (between pipes and unit)  
3. Evacuate the air in the connecting pipes using  
VACUUM PUMP.  
4. Check the gas leakage. (Connected points)  
 Pipe size  
Gas side  
28.6 mm  
12.7 mm  
Pipe size  
Liquid side  
 Liquid side refrigerant pipe  
connection  
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.  
– 22 –  
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Installation Manual  
Concealed Duct High Static Pressure  
• Remove the cup on the gas side piping by using a brazing  
machine.  
Tightening connection  
CAUTION  
CAUTION  
Do not apply excessive torque. Otherwise, the nut  
may crack depending on the conditions.  
Do not burn the pipe heat insulator.  
Remove the cap.  
Attached joint part  
(Unit: N•m)  
Outer dia. of copper pipe  
Tightening torque  
12.7 mm (dia.)  
50 to 62 (5.0 to 6.2 kgf•m)  
M Tightening torque of flare pipe connections  
Pressure of R410A is higher than that of R22.  
(Approx. 1.6 times) Therefore, using a torque wrench, tighten  
the flare pipe connecting sections which connect the indoor  
and outdoor units of the specified tightening torque.  
Incorrect connections may cause not only a gas leak, but also  
a trouble of the refrigeration cycle.  
Connection pipe  
Locally procured  
Ø28.6 mm  
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.  
• Braze the attached joint part to the gas side piping and  
braze the connection piping to the joint part.  
brazing  
Half union  
Flare nut  
Braze all around  
brazing  
Internally  
threaded side  
Externally  
threaded side  
Use a wrench to secure.  
Use a torque wrench to tighten.  
• Turn back the pipe heat insulator and tie up with a banding  
band.  
REQUIREMENT  
Tightening with an excessive torque may crack the nut  
depending on installation conditions.  
Tighten the nut within the specified tightening torque.  
Tie up with a banding  
band.  
Piping with outdoor unit  
 Gas side refrigerant pipe  
connection  
• For details of installation, refer to the Installation Manual of  
the outdoor unit.  
• Turn up the pipe heat insulator to the unit side.  
• Wrap the pipe with wet cloth.  
 Evacuation  
Turn up pipe heat  
insulator  
Using a vacuum pump, perform vacuuming from the charge  
port of valve of the outdoor unit.  
For details, follow to the Installation Manual attached to the  
outdoor unit.  
• Never use the refrigerant sealed in the outdoor unit for  
evacuation.  
Wet cloth  
Remove the all  
brazed part.  
REQUIREMENT  
For the tools such as charge hose, etc., use those  
manufactured exclusively for R410A.  
23-EN  
– 23 –  
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Refrigerant amount to be added  
Heat insulation process  
For addition of the refrigerant, add refrigerant “R410A”  
referring to the attached Installation Manual of outdoor unit.  
Be sure to use a scale to charge the refrigerant of specified  
amount.  
Apply heat insulation for the pipes separately at liquid side  
and gas side.  
For the heat insulation to the pipes at gas side, be sure to use  
the material with heat-resisting temperature 120°C or higher.  
Using the attached heat insulation material, apply the heat  
insulation to the pipe connecting section of the indoor unit  
securely without gap.  
REQUIREMENT  
• Charging an excessive or too little amount of refrigerant  
causes a trouble of the compressor.  
REQUIREMENT  
Be sure to charge the refrigerant of specified amount.  
• A personnel who charged the refrigerant should write  
down the pipe length and the added refrigerant amount in  
the nameplate attached to the service panel of the  
outdoor unit. It is necessary to fix the compressor and  
refrigeration cycle malfunction.  
• Apply the heat insulation to the pipe connecting section of  
the indoor unit securely up to the root without exposure of  
the pipe. (The pipe exposed to the outside causes water  
leak.)  
• Wrap heat insulator with its slits facing up (ceiling side).  
Indoor unit  
Union  
Open the valve fully  
Open the valve of the outdoor unit fully. A 4mm-hexagonal  
wrench is required for opening the valve.  
For details, refer to the Installation Manual attached to the  
outdoor unit.  
Gas leak check  
EN  
Heat insulator of  
the pipe  
Check with a leak detector or soap water whether gas leaks  
or not, from the pipe connecting section or cap of the valve.  
Heat insulation  
(Accessory)  
Flare nut  
REQUIREMENT  
Use a leak detector manufactured exclusively for HFC  
refrigerant (R410A, R134a, etc.).  
– 24 –  
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Installation Manual  
Concealed Duct High Static Pressure  
8 ELECTRICAL CONNECTION  
WARNING  
Remote controller wiring  
2-core non polarity wire is used for the remote controller  
wiring.  
1. Using the specified wires, ensure to connect  
the wires, and fix wires securely so that the  
external tension to the wires do not affect the  
connecting part of the terminals.  
Wiring  
1. Figure below shows the wiring connections indoor  
power line and between the indoor and outdoor units  
and between the indoor units and remote controller.  
The wires indicated by the dash lines are provided at  
the installation place.  
Incomplete connection or fixation may cause a fire,  
etc.  
2. Be sure to connect earth wire. (grounding  
work)  
Incomplete grounding cause an electric shock.  
Do not connect ground wires to gas pipes, water  
pipes, lightning rods or ground wires for telephone  
wires.  
2. Insulate the unsheathed redundant cords (conductors)  
with electrical insulation tape.  
Process them so that they do not touch any electrical or  
metal parts.  
3. 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.  
 Wiring diagram  
Outdoor Input power  
380-415V 3N~, 50 Hz  
CAUTION  
L
L
L
1
2
3
Outdoor  
unit  
• If incorrect/incomplete wiring is carried out, it will cause  
an electrical fire or smoke.  
N
• Be sure to install an earth leakage breaker that is not  
tripped by shock waves.  
If an earth leakage breaker is not installed, an electric  
shock may be caused.  
• Be sure to use the cord clamps attached to the product.  
• Do not damage or scratch the conductive core and inner  
insulator of power and inter-connecting wires when  
peeling them.  
• Use the power cord and Inter-connecting wire of  
specified thickness, type, and protective devices  
required.  
1
1
2
3
Circuit breaker  
(Leakage breaker)  
Indoor Fan Input power  
220-240V~, 50 Hz  
2
3
L
Indoor  
unit  
N
A
B
Circuit breaker  
(Leakage breaker)  
REQUIREMENT  
Wired remote  
controller  
• For power supply wiring, strictly conform to the Local  
Regulation in each country.  
• Power supply for indoor unit must be exclusive and  
separated from the one for outdoor unit.  
 Power and Wiring  
Specification  
• For wiring of power supply of the outdoor units, follow the  
Installation Manual of each outdoor unit.  
• Never connect 220–240V power to the terminal blocks  
A
B
(
(Otherwise, the system will fail.)  
,
, etc.) for control wiring.  
Indoor fan Power supply  
220-240V~, 50 Hz  
• 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.  
• After connecting wires to the terminal blocks, provide a  
trap and fix wires with the cord clamp.  
Maximum running  
current  
15A  
25A  
Fuse rating  
3 x 2.5mm2 or more  
(H07 RN-F or 60245 IEC 66)  
Indoor fan power supply  
wire*  
• Run the refrigerant piping line and control wiring line in  
the same line.  
4 x 1.5mm2 or more  
(H07 RN-F or 60245 IEC 66)  
System interconnecting  
wires*  
• Do not turn on the power of the indoor unit until  
vacuuming of the refrigerant pipes completes.  
*Number of wire x wire size  
25-EN  
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 Wire connection  
REQUIREMENT  
• Be sure to connect the wires matching the terminal numbers. Incorrect connection causes a trouble.  
• Be sure to pass the wires through the bushing of wire connection holes of the indoor unit.  
• Keep a margin (Approx. 100mm) on a wire to hang down the electrical control box at servicing, etc.  
• The low-voltage circuit is provided for the remote controller. (Do not connect the high-voltage circuit)  
1. Remove the cover of the electrical control box by taking off the mounting screws (2 positions)  
2. Tighten the screws of the terminal block, and fix the wires with cord attached to the electrical control box.  
(Do not apply tension to the connecting section of the terminal block.)  
3. Mount the cover of the electrical control box without pinching wires.  
<Terminal block of electrical control box>  
Electrical  
control box  
cover  
System  
interconnecting  
Terminal block  
Wired remote controller  
connecting Terminal  
block  
Indoor fan power  
supply Terminal  
block  
Fixing screw  
EN  
Bushing  
Wired remote  
controller wire  
Indoor fan power supply  
wire  
Cord clamp  
System interconnecting  
wire  
– 26 –  
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Concealed Duct High Static Pressure  
Group control  
(Unit: mm)  
Wired remote  
controller  
S (N)  
R (L)  
A
B
A
B
Indoor Unit  
Indoor Unit  
Outdoor Unit  
Outdoor Unit  
Indoor fan power supply wire  
1
2
3
System interconnecting wire  
 Remote Controller Wiring  
• Strip off approx. 9mm the wire to be connected.  
• Non polarity, 2 core wire is used for wiring of the remote  
controller. (0.5mm² to 2.0mm² wires)  
Wiring diagram  
Terminal block for  
remote controller  
wiring of indoor unit  
Terminal block  
Remote  
controller  
A
B
A
B
unit  
Remote controller wire  
(Locally procured)  
27-EN  
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Concealed Duct High Static Pressure  
9 APPLICABLE CONTROLS  
Procedure 1  
Push button and TEMP.  
at least 4 seconds.  
REQUIREMENT  
button simultaneously for  
• 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>  
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  
It takes approx. 5 minutes until the remote controller  
becomes available.  
while after  
button is pushed.)  
Approx. 5 minutes  
Remote  
controller is  
available  
“SETTING”  
goes out  
“SETTING”  
flashes  
Power on  
<When power is turned on for the second (or  
later) time>  
(* Display content varies with  
the indoor unit model.)  
It takes approx. 1 minute until the remote controller  
becomes available.  
Procedure 2  
Each time you push  
button, indoor unit numbers in  
the control group change cyclically. Select the indoor unit you  
want to change settings for.  
Approx. 1 minutes  
Remote  
controller is  
available  
“SETTING”  
goes out  
The fan of the selected unit runs. You can confirm the indoor  
unit for which you want to change settings.  
“SETTING”  
flashes  
Power on  
EN  
• 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.  
Procedure 3  
Using TEMP.  
/
buttons, specify CODE No. [  
buttons, select SET DATA  
].  
Procedure 4  
Using TIME  
/
[
].  
Procedure 5  
Push  
lit, the setup is completed.  
button. When the display changes from flashing to  
 Changing of setting  
applicable control  
• To change settings of another indoor unit, repeat from  
Procedure 2.  
• To change other settings of the selected indoor unit, repeat  
Basic procedure for changing settings  
Change the settings while the air conditioner is not working.  
(Be sure to stop the air conditioner before making settings.)  
from Procedure 3.  
Use  
To make settings after  
button to clear the settings.  
button was pushed, repeat from  
Procedure 2.  
1
3
4
6
1 5  
2
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Installation Manual  
Concealed Duct High Static Pressure  
Procedure 6  
When settings have been completed, push  
 Power saving mode  
button to  
determine the settings.  
When  
1. Push  
button for at least four seconds when  
button is pushed, “SETTING” flashes and then the  
display content disappears and the air conditioner enters the  
normal stop mode.  
the air conditioner is not working.  
flashes.  
Indicates CODE No. “C2.”  
2. Select an indoor unit to be set by pushing  
side of the button).  
(While “SETTING” is flashing, no operation of the remote  
controller is accepted.)  
(left  
Each time you push the button, unit numbers change as  
follows:  
UNIT No.  
1-1  
UNIT No.  
1-2  
UNIT No.  
1-3  
UNIT No.  
1-4  
 Filter sign setting  
The fan of the selected unit runs.  
3. Adjust the power save setting by pushing TIME  
buttons.  
According to the installation condition, the filter sign term  
(Notification of filter cleaning) can be changed.  
Follow to the basic operation procedure  
Each push of the button changes the power level by 1%  
within the range from 100% to 50%.  
* The factory default is 75%.  
(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 term from the following table.  
SET DATA  
0000  
Filter sign term  
None  
0001  
150H  
2500H  
(Factory default)  
0002  
Setting of power level in  
power saving mode  
0003  
0004  
5000H  
4. Determine the setting by pushing  
button.  
10000H  
5. Push button to complete the setting.  
 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  
0000  
Detection temperature shift value  
No shift  
+1°C  
0001  
+2°C  
(Factory default)  
0002  
0003  
0004  
0005  
0006  
+3°C  
+4°C  
+5°C  
+6°C  
29-EN  
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Concealed Duct High Static Pressure  
 Remote controller switch  
monitoring function  
Outdoor unit data  
Data name  
CODE No.  
60  
Outdoor unit heat exchanger (coil)  
temperature (TE)  
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.  
61  
62  
63  
64  
65  
6A  
Outside air temperature (TO)  
Compressor discharge temperature (TD)  
Compressor suction temperature (TS)  
—
Heatsink temperature (THS)  
Operating current (x1/10)  
Compressor cumulative operating hours  
(x100h)  
F1  
2
4
1
3
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  
EN  
No.  
is also displayed.  
buttons, select the number of  
2. Pushing TEMP.  
sensor, etc. (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.  
4. Push  
button to return to the normal display.  
Indoor unit data  
CODE No.  
Data name  
01  
02  
Room temperature (remote controller)  
Indoor unit intake air temperature (TA)  
Indoor unit heat exchanger (coil)  
temperature (TCJ)  
03  
04  
F3  
Indoor unit heat exchanger (coil)  
temperature (TC)  
Indoor unit fan cumulative operating hours  
(x1 h)  
– 30 –  
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Concealed Duct High Static Pressure  
 Group control  
Group control for system of multiple units  
One remote controller can control up to 8 indoor units as a group.  
M Group control in single system  
Outdoor unit  
Outdoor unit  
Outdoor unit  
Indoor unit  
Outdoor unit  
Indoor unit  
Outdoor unit  
Indoor unit  
Indoor unit  
Indoor unit  
(Max. 8 units)  
Remote controller  
Finish of address setup by power-ON  
• For wiring procedure and wiring method of the individual line (Identical refrigerant line) system, refer 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. 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.  
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Concealed Duct High Static Pressure  
Procedure example 1  
3. Push  
button.  
In this time, the setup finishes when the display changes  
from flashing to lighting.  
Manual address setup procedure  
While the operation stops, change the setup.  
(Be sure to stop the operation of the unit.)  
Indoor unit No. before setup change is displayed.  
7
3
4
5
-2,  
-2,  
-2  
3
4
-1,  
-1,  
5 -1,  
6
7
3
4
5
-3,  
-3,  
-3,  
Procedure 4  
1. Using TEMP.  
/
buttons, specify CODE No.  
1
2,6  
[13].  
(CODE No. [13]: Indoor address)  
Procedure 1  
Push simultaneously  
2. Using TIME  
address from [  
/
buttons, change the indoor  
].  
+
more. After a while, the display part flashes as shown below.  
+
buttons for 4 seconds or  
3
] to [  
2
3. Push  
button.  
Check the displayed CODE No. is [10].  
In this time, the setup finishes when the display changes  
from flashing to lighting.  
• When the CODE No. is other than [10], push  
erase the display and repeat procedure from the first step.  
(After pushing button, operation of the remote  
button to  
Indoor unit No. before setup change is displayed.  
EN  
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.)  
Procedure 5  
1. Using TEMP.  
[14].  
(CODE No. [14]: Group address)  
2. Using TIME buttons, change the SET DATA  
from [0001] to [0002].  
(SET DATA [Header unit: 0001] [Follower unit: 0002])  
Procedure 2  
Every pushing  
button, the indoor UNIT No. in the  
/
buttons, specify CODE No.  
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. Push  
button.  
Procedure 3  
1. Using TEMP.  
[12].  
In this time, the setup finishes when the display changes  
from flashing to lighting.  
/
buttons, specify CODE No.  
(CODE No. [12]: Line address)  
2. Using TIME buttons, change the line address  
from [ ] to [  
Indoor UNIT No. before setup change is displayed.  
/
3
2].  
– 32 –  
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Concealed Duct High Static Pressure  
Procedure 6  
If there is other indoor unit to be changed, repeat procedure  
To recognize the position of the  
corresponding indoor unit though the  
indoor UNIT No. is known  
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  
Check the position during operation stop.  
(Be sure to stop operation of the set.)  
No. [12], [13], [14] in order with TEMP.  
and then check the changed contents.  
/
buttons,  
Address change check Before change:  
[3-3-1] ꢀ After change: [2-2-2]  
Pushing  
changed.  
button clears the contents of which setup was  
(In this case, procedure from 2 is repeated.)  
Indoor UNIT No. before setup change is displayed.  
1
2
1,3  
Procedure 1  
Push simultaneously  
+
buttons 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  
Procedure 7  
After check of the changed contents, push  
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.)  
button. (Setup  
is determined.) When pushing button, the display  
disappears and the status becomes the usual stop status.  
(When pushing button the operation from the remote  
controller is not accepted for approx. 1 minute.)  
* If the operation from the remote controller is not accepted  
button, it  
even 1 minute or more passed after pushing  
is considered that the address setup is incorrect.  
(* Display changes according to  
the model No. of indoor unit.)  
In this case, the automatic address must be again set up.  
Therefore repeat procedure of the setup change from  
the Procedure 1.  
Procedure 2  
In the group control, every pushing  
button, 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.)  
Procedure 3  
After confirmation, push  
button to return the mode to the  
usual mode.  
When pushing  
status becomes the usual stop status.  
button, the display disappears and the  
(When pushing button the operation from the remote  
controller is not accepted for approx. 1 minute.)  
33-EN  
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Concealed Duct High Static Pressure  
 8°C Operation  
Pre-heating operation can be set for cold regions where room  
temperature drops to below zero.  
Procedure 1  
Push simultaneously  
+
+
buttons 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  
erase the display and repeat procedure from the first step.  
(After pushing button, operation of the remote  
button to  
controller is not accepted for approx. 1 minute.)  
(* Display changes according to  
the model No. of indoor unit.)  
Procedure 2  
Every pushing  
button, 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.  
EN  
Procedure 3  
Using TEMP.  
/
buttons, specify CODE No. [d1].  
Procedure 4  
Using TIME  
/
buttons, select SET DATA [0001].  
SET DATA  
0000  
8°C Operation setting  
None  
(Factory default)  
0001  
8°C Operation setting  
Procedure 5  
Push  
button.  
In this time, the setup finishes when the display changes from  
flashing to lighting.  
Procedure 6  
Push  
button.(Setup is determined.)  
When pushing  
status  
Becomes the usual stop status. (When pushing  
button, the display disappears and the  
button  
the operation from the remote controller is not accepted for  
approx. 1 minute.)  
– 34 –  
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Concealed Duct High Static Pressure  
10TEST RUN  
Procedure 3  
 Before test run  
Using  
[Heat].  
button, select the operation mode, [Cool] or  
• Before turning on the power supply, carry out the following  
procedure.  
• Do not run the air conditioner in a mode other than [Cool]  
or [Heat].  
1) Using 500V-megger, check that resistance of 1M!  
or more exists between the terminal block 1 to 3 and  
the earth (grounding).  
• The temperature controlling function does not work during  
test run.  
If resistance of less than 1M! is detected, do not run  
the unit.  
• The detection of error is performed as usual.  
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.  
Procedure 4  
After the test run, push  
(Display part is same as procedure 1.)  
 Execute a test run  
button to stop 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.  
Procedure 5  
Push  
mode.  
check button to cancel (release from) the test run  
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.  
([TEST] disappears on the display and the status returns to a  
normal.)  
CAUTION  
• Do not use the forced test run for cases other than the  
test run because it applies an excessive load to the  
devices.  
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.  
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Concealed Duct High Static Pressure  
11MAINTENANCE  
CAUTION  
When connecting a return air duct to the unit, the cleaning method of the air filter differs according to the  
construction of duct end. Ask a qualified installer or qualified service person.  
<Daily maintenance>  
Cleaning of air filter  
1. If  
is displayed on the remote controller, contact to qualified  
installer or qualified service person.  
2. Take out the air filter.  
1,2  
3
• Push the extrusion of the air filter to inside and pull out it to take  
out the air filter.  
3. 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.  
4. Mount the air filter.  
5. After cleaning, push  
display disappears.  
.
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.  
• When a drain pump kit (sold separately) is installed.  
If it is used in a place full of dust or oil mist, the pump will be clogged and proper drainage is disabled.  
Clean the drain pump periodically. For how to clean the drain pump, contact the dealer.  
– 36 –  
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Concealed Duct High Static Pressure  
Maintenance List  
Part  
Unit  
Check (visual/auditory)  
Maintenance  
• Dust/dirt clogging, scratches  
• Wash the heat exchanger when it is  
clogged.  
Heat exchanger  
Indoor/outdoor  
• Sound  
• Take appropriate measures when  
abnormal sound is generated.  
Fan motor  
Filter  
Indoor/outdoor  
Indoor  
• Dust/dirt, breakage  
• Wash the filter with water when it is  
contaminated.  
• Replace it when it is damaged.  
• Vibration, balance  
• Dust/dirt, appearance  
• Replace the fan when vibration or balance  
is terrible.  
• Brush or wash the fan when it is  
contaminated.  
Fan  
Indoor  
• Dust/dirt, scratches  
• Fix or replace them when they are  
deformed or damaged.  
Air inlet/outlet grilles  
Drain pan  
Indoor/outdoor  
Indoor  
• Dust/dirt clogging, drain  
contamination  
• Clean the drain pan and check the  
downward slope for smooth drainage.  
Ornamental panel,  
louvres  
• Dust/dirt, scratches  
• Wash them when they are contaminated or  
apply repair coating.  
Indoor  
• Rust, peeling of insulator  
• Peeling/lift of coat  
• Apply repair coating.  
Exterior  
Outdoor  
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Concealed Duct High Static Pressure  
12TROUBLESHOOTING  
Procedure 2  
Every pushing of  
 Confirmation and check  
button used to set temperature, the  
error log stored in memory is displayed in order.  
The numbers in CODE No. indicate CODE No. [01] (latest) ꢀ  
[04] (oldest).  
When an error occurred in the air conditioner, an error code  
and indoor UNIT No. appear on the display part of the remote  
controller.  
The error code is only displayed during the operation.  
If the display disappears, operate the air conditioner  
according to the following “Confirmation of error log” for  
confirmation.  
REQUIREMENT  
Do not push button because all the error log of the indoor  
unit will be deleted.  
Procedure 3  
After confirmation, push  
display.  
button to return to the usual  
Error code  
Indoor UNIT No. in  
which an error occurred  
 Confirmation of error log  
When an error occurred on the air conditioner, the error log  
can be confirmed with the following procedure. (The error  
history is stored in memory up to 4 errors.)  
The log can be confirmed from both operating status and stop  
status.  
EN  
2
3
1
Procedure 1  
When pushing  
and  
buttons at the same time for 4  
seconds or more, the following display appears.  
If is displayed, the mode enters in the error log mode.  
• [01: Order of error log] is displayed in CODE No..  
• [Error code] is displayed in CHECK.  
• [Indoor unit address in which an error occurred] is  
displayed in Unit No..  
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Concealed Duct High Static Pressure  
 Error codes and parts to be checked  
Wired remote  
controller  
display  
Air conditioner  
status  
Main defective parts  
Judging device  
Parts to be checked / error description  
Indication  
Incorrect remote controller setting --- The header remote controller has  
not been set (including two remote controllers).  
No header remote controller  
Remote  
controller  
E01  
*
Remote controller  
communication error  
No signal can be received from the indoor unit.  
Remote controller transmission  
error  
Remote  
controller  
System interconnecting wires, indoor P.C. board, remote controller  
--- No signal can be sent to the indoor unit.  
E02  
E03  
*
Indoor unit-remote controller  
regular communication error  
Remote controller, network adapter, indoor P.C. board --- No data is  
received from the remote controller or network adapter.  
Indoor  
Indoor  
Indoor  
Auto-reset  
Indoor unit-outdoor unit serial  
communication error  
System interconnecting wires, indoor P.C. board, outdoor P.C. board -  
-- Serial communication error between indoor unit and outdoor unit  
E04  
E08  
Auto-reset  
Auto-reset  
IPDU-CDB communication error  
Duplicated indoor addresses  
Indoor address setting error --- The same address as the self-address  
was detected.  
Remote controller address setting error --- Two remote controllers are  
set as header in the double-remote controller control.  
Duplicated header remote  
controllers  
Remote  
controller  
E09  
*
(* The header indoor unit stops raising alarm and follower indoor units  
continue to operate.)  
Indoor P.C. board --- Communication error between main MCU and  
motor microcomputer MCU  
E10  
E18  
CPU-CPU communication error Indoor  
Header indoor unit-indoor  
Auto-reset  
Auto-reset  
Indoor P.C. board --- Regular communication is not possible between  
header and follower indoor units or between twin header (main) and  
follower (sub) units.  
follower unit regular  
communication error  
Indoor  
E31  
F01  
IPDU communication error  
Outdoor  
Indoor  
Communication error between IPDU and CDB  
Entire stop  
Auto-reset  
Indoor unit heat exchanger  
sensor (TCJ) error  
Heat exchanger sensor (TCJ), indoor P.C. board --- Open-circuit or  
short-circuit of the heat exchanger sensor (TCJ) was detected.  
Indoor unit heat exchanger  
sensor (TC) error  
Heat exchanger sensor (TC), indoor P.C. board --- Open-circuit or  
short-circuit of the heat exchanger sensor (TC) was detected.  
F02  
F04  
Indoor  
Auto-reset  
Entire stop  
Outdoor unit discharge temp.  
sensor (TD) error  
Outdoor temp. sensor (TD), outdoor P.C. board --- Open-circuit or  
short-circuit of the discharge temp. sensor was detected.  
Outdoor  
Outdoor unit temp. sensor (TE/  
TS) error  
Outdoor temp. sensors (TE/TS), outdoor P.C. board --- Open-circuit or  
short-circuit of the heat exchanger temp. sensor was detected.  
F06  
F07  
F08  
Outdoor  
Outdoor  
Outdoor  
Entire stop  
Entire stop  
TL sensor error  
TL sensor may be displaced, disconnected or short-circuited.  
Outdoor unit outside air temp.  
sensor error  
Outdoor temp. sensor (TO), outdoor P.C. board --- Open-circuit or  
short-circuit of the outdoor air temp. sensor was detected.  
Operation  
continued  
Indoor unit room temp. sensor  
(TA) error  
Room temp. sensor (TA), indoor P.C. board --- Open-circuit or short-  
circuit of the room temp. sensor (TA) was detected.  
F10  
F12  
F13  
F15  
F29  
F31  
Indoor  
Auto-reset  
Entire stop  
Entire stop  
Entire stop  
Auto-reset  
Entire stop  
TS (1) sensor error  
Outdoor  
Outdoor  
Outdoor  
Indoor  
TS (1) sensor may be displaced, disconnected or short-circuited.  
Abnormal temperature was detected by the temp. sensor of the IGBT  
heat sink.  
Heat sink sensor error  
Temp. sensor connection error  
Temp. sensor (TE/TS) may be connected incorrectly.  
Indoor P.C. board --- EEPROM error  
Indoor unit, other P.C. board  
error  
Outdoor unit P.C. board  
Outdoor  
Outdoor P.C. board ---- In the case of EEPROM error.  
Current detect circuit, power voltage --- Minimum frequency was  
reached in the current releasing control or short-circuit current (Idc)  
after direct excitation was detected  
Outdoor unit compressor  
breakdown  
H01  
Outdoor  
Entire stop  
H02  
H03  
H04  
Outdoor unit compressor lock  
Outdoor  
Outdoor  
Outdoor  
Compressor circuit --- Compressor lock was detected.  
Entire stop  
Entire stop  
Entire stop  
Outdoor unit current detect circuit  
error  
Current detect circuit, outdoor unit P.C. board --- Abnormal current was  
detected in AC-CT or a phase loss was detected.  
Case thermostat operation (1)  
Malfunction of the case thermostat  
Current, high-pressure switch circuit, outdoor P.C. board --- Ps  
pressure sensor error was detected or low-pressure protective  
operation was activated.  
Outdoor unit low-pressure  
system error  
H06  
Outdoor  
Entire stop  
Duplicated header indoor units  
Indoor address setting error --- There are two or more header units in  
the group.  
L03  
L07  
Indoor  
Indoor  
Entire stop  
Entire stop  
Group line in individual indoor  
unit  
Indoor address setting error --- There is at least one group-connected  
indoor unit among individual indoor units.  
L08  
L09  
L10  
Indoor group address not set  
Indoor power level not set  
Outdoor unit P.C. board  
Indoor  
Indoor  
Outdoor  
Indoor address setting error --- Indoor address group has not been set. Entire stop  
Indoor power level has not been set. Entire stop  
In the case of outdoor P.C. board jumper wire (for service) setting error Entire stop  
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Concealed Duct High Static Pressure  
Wired remote  
controller  
display  
Air conditioner  
status  
Main defective parts  
Judging device  
Parts to be checked / error description  
Indication  
Network  
adapter central  
control  
Address setting, central control remote controller, network adapter ---  
Duplication of address in central control communication  
L20  
LAN communication error  
Auto-reset  
Entire stop  
Other outdoor unit error  
1) Communication error between IPDU MCU and CDB MCU  
L29  
Other outdoor unit error  
Outdoor  
Entire stop  
2) Abnormal temperature was detected by the heat sink temp. sensor  
in IGBT.  
Abnormal external input into  
indoor unit (interlock)  
External devices, outdoor unit P.C. board --- Abnormal stop due to  
incorrect external input into CN80  
L30  
L31  
Indoor  
Entire stop  
Operation  
Power supply phase sequence, outdoor unit P.C. board --- Abnormal continued  
Phase sequence error, etc.  
Outdoor  
phase sequence of the 3-phase power supply  
(thermostat  
OFF)  
Indoor fan motor, indoor P.C. board --- Indoor AC fan error (fan motor  
thermal relay activated) was detected.  
P01  
P03  
P04  
P05  
P07  
P10  
P15  
Indoor unit fan error  
Indoor  
Entire stop  
Entire stop  
Entire stop  
Entire stop  
Entire stop  
Entire stop  
Entire stop  
Outdoor unit discharge temp.  
error  
Outdoor  
Outdoor  
Outdoor  
Outdoor  
Indoor  
An error was detected in the discharge temp. releasing control.  
Outdoor unit high-pressure  
system error  
High-pressure switch --- The IOL was activated or an error was  
detected in the high-pressure releasing control using the TE.  
The power supply wire may be connected incorrectly. Check open  
phase and voltages of the power supply.  
Open phase detected  
Heat sink overheat  
Abnormal temperature was detected by the temp. sensor of the IGBT  
heat sink.  
Indoor unit water overflow  
detected  
Drain pipe, clogging of drainage, float switch circuit, indoor P.C. board  
--- Drainage is out of order or the float switch was activated.  
There may be gas leakage from the pipe or connecting part. Check for  
gas leakage.  
Gas leakage detected  
4-way valve error  
Outdoor  
EN  
4-way valve, indoor temp. sensors (TC/TCJ) --- An error was detected  
due to temperature drop of the indoor unit heat exchanger sensor  
when heating.  
Outdoor  
(Indoor)  
Auto-reset  
(Auto-reset)  
P19  
P20  
P22  
High-pressure protective  
operation  
Outdoor  
Outdoor  
High-pressure protection  
Entire stop  
Entire stop  
Outdoor unit fan motor, outdoor unit P.C. board --- An error  
(overcurrent, locking, etc.) was detected in the outdoor unit fan drive  
circuit.  
Outdoor unit fan error  
IGBT, outdoor unit P.C. board, inverter wiring, compressor --- Short-  
circuit protection for compressor drive circuit devices (G-Tr/IGBT) was Entire stop  
activated.  
Outdoor unit inverter Idc  
activated  
P26  
P29  
P31  
Outdoor  
Outdoor  
Indoor  
Outdoor unit P.C. board, high-pressure switch --- Compressor motor  
position error was detected.  
Outdoor unit position error  
Other indoor unit error  
Entire stop  
Another indoor unit in the group is raising an alarm.  
Entire stop  
Auto-reset  
E03/L07/L03/L08 alarm check locations and error description  
: The air conditioner automatically enters the auto-address setting mode.  
– 40 –  
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