Fujitsu ARXG-KHTAP Series Installation Manual

AIR CONDITIONER
INDOOR UNIT (Duct type)

INSTALLATION MANUAL

PART No. 9381386215

[Original instructions] For authorized service personnel only.

Contents

1. SAFETY PRECAUTIONS ……………………………………………… 1

2. PRODUCT SPECIFICATION …………………………………………… 4

2.1. Installation tools …………………………………………………… 4

2.2. Accessories …………………………………………………………4

2.3. Pipe requirement …………………………………………………… 5

2.4. Electrical requirement ……………………………………………… 5

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

3. INSTALLATION WORK ………………………………………………… 5

3.1. Selecting an installation location ………………………………… 5

3.2. Installation dimension ……………………………………………… 6

3.3. Installing the unit ……………………………………………………6

3.4. Intake duct connection …………………………………………… 7

3.5. Drain installation …………………………………………………… 7

3.6. Pipe installation …………………………………………………… 8

3.7. Fresh air intake ……………………………………………………… 9

3.8. Electrical wiring ………………………………………………… 10

3.9. Remote controller installation …………………………………… 11

4. OPTIONAL INSTALLATION WORK ………………………………… 11

4.1. Optional kit installation ………………………………………… 11

4.2. External input and output ……………………………………… 11

4.3. Remote sensor ………………………………………………… 12

5. REMOTE CONTROL INSTALLATION ……………………………… 12

5.1. Group control …………………………………………………… 12

5.2. Multiple remote control ………………………………………… 13

5.3. DIP switch 101 setting …………………………………………… 13

6. FUNCTION SETTING ………………………………………………… 13

6.1. Function details ………………………………………………… 13

6.2. Static pressure …………………………………………………… 14

7. CHECK LIST …………………………………………………………… 15

8. TEST RUN ……………………………………………………………… 15

8.1. Check items ……………………………………………………… 15

8.2. Operation method ……………………………………………… 15

9. FINISHING ……………………………………………………………… 15

10. CUSTOMER GUIDANCE ……………………………………………… 15

11. ERROR CODES ……………………………………………………… 16

WARNING

CAUTION

Indicates a potentially or imminently hazardous situation
which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation that may result in
minor or moderate injury or damage to property.

WARNING

• The appliance shall be installed, operated and stored in a room with a fl oor area larger
than X m².

Amount of refrigerant charge

M (kg)

M ≤ 1.22 -

1.22 < M ≤ 1.23 1.45

1.23 < M ≤ 1.50 2.15

1.50 < M ≤ 1.75 2.92

1.75 < M ≤ 2.0 3.82

2.0 < M ≤ 2.5 5.96

2.5 < M ≤ 3.0 8.59

3.0 < M ≤ 3.5 11.68

3.5 < M ≤ 4.0 15.26

(IEC 60335-2-40)

• Installation of this product must be done by experienced service technicians or profes­sional installers only in accordance with this manual. Installation by non-professional
or improper installation of the product might cause serious accidents such as injury,
water leakage, electric shock, or fi re. If the product is installed in disregard of the
instructions in this manual, it will void the manufacturer’s warranty.

• Do not turn on the power until all work has been completed. Turning on the power be­fore the work is completed can cause serious accidents such as electric shock or fi re.

• If refrigerant leaks when you are working, ventilate the area. If the leaking refrigerant
is exposed to a direct fl ame, it may produce a toxic gas.

• Installation must be performed in accordance with regulations, codes, or standards for
electrical wiring and equipment in each country, region, or the installation place.

• Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.

• This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance by a
person responsible for their safety. Children should be supervised to ensure that they
do not play with the appliance.

• To avoid danger of suffocation, keep the plastic bag or thin fi lm used as the packaging
material away from young children.

• The appliance shall be stored in a room without continuously operating ignition
sources (for example: open fl ames, an operating gas appliance or an operating
electric heater).

• Do not pierce or burn.

• Be aware that refrigerants may not contain an odour.

Minimum room area

X (m

2

)

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NOTE: This manual describes how to install the air conditioner described above. Handling

and installation shall only be done by professionals as outlined in this manual.

1. SAFETY PRECAUTIONS

• Be sure to read this manual thoroughly before installation.

• The warnings and precautions indicated in this manual contain important information
pertaining to your safety. Be sure to observe them.

• Hand this manual, together with the operating manual, to the customer. Request the
customer to keep them on hand for future use, such as for relocating or repairing the
unit.

En-1

CAUTION

• Read carefully all safety information written in this manual before you install or use the

air conditioner.

• Install the product by following local codes and regulations in force at the place of

installation, and the instructions provided by the manufacturer.

• This product is part of a set constituting an air conditioner. The product must not be

installed alone or be installed with a device not authorized by the manufacturer.

• Always use a separate power supply line protected by a circuit breaker operating on

all wires with a distance between contact of 3 mm for this product.

• To protect the persons, earth (ground) the product correctly, and use the power cable

combined with an Earth Leakage Circuit Breaker (ELCB).

• This product is not explosion proof, and therefore should not be installed in an explo-

sive atmosphere.

• To avoid getting an electric shock, never touch the electrical components soon after

the power supply has been turned off. After turning off the power, always wait 5 min­utes or more before you touch the electrical components.

• This product contains no user-serviceable parts. Always consult experienced service

technicians for repairing.

• When moving or relocating the air conditioner, consult experienced service technicians

for disconnection and reinstallation of the product.

• Do not touch the aluminum fi ns of heat exchanger built-in the indoor or outdoor unit to

avoid personal injury when you install or maintain the unit.

• Do not place any other electrical products or household belongings under the product.

Condensation dripping from the product might get them wet, and may cause damage
or malfunction to the property.

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

Precautions for using R32 refrigerant

The basic installation work procedures are the same as conventional refrigerant (R410A,
R22) models.
However, pay careful attention to the following points:

Since the working pressure is 1.6 times higher than that of refrigerant R22 models,
some of the piping and installation and service tools are special. (See “2. 1. Installation
tools”.)
Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model,
always replace the conventional piping and flare nuts with the R32 and R410A piping and
fl are nuts on the outdoor unit side.
For R32 and R410A, the same fl are nut on the outdoor unit side and pipe can be used.

Models that use refrigerant R32 and R410A have a different charging port thread diam­eter to prevent erroneous charging with refrigerant R22 and for safety. Therefore, check
beforehand. [The charging port thread diameter for R32 and R410A is 1/2-20 UNF.]

Be more careful than R22 so that foreign matter (oil, water, etc.) does not enter the
piping. Also, when storing the piping, securely seal the opening by pinching, taping, etc.
(Handling of R32 is similar to R410A.)

CAUTION

1-Installation (Space)

• That the installation of pipe-work shall be kept to a minimum.

• That pipe-work shall be protected from physical damage.

• The appliance shall not be installed in an unventilated space, if that space is smaller
than X m².

Amount of refrigerant charge

M (kg)

M ≤ 1.22 -

1.22 < M ≤ 1.23 1.45

1.23 < M ≤ 1.50 2.15

1.50 < M ≤ 1.75 2.92

1.75 < M ≤ 2.0 3.82

2.0 < M ≤ 2.5 5.96

2.5 < M ≤ 3.0 8.59

3.0 < M ≤ 3.5 11.68

3.5 < M ≤ 4.0 15.26

(IEC 60335-2-40)

• That compliance with national gas regulations shall be observed.

• That 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, properly
processed.

Minimum room area

X (m

2

)

CAUTION

2-Servicing
2-1 Service personnel

• Any person who is involved with working on or breaking into a refrigerant circuit
should hold a current valid certifi cate from an industry-accredited assessment
authority, which authorises their competence to handle refrigerants safely in accor­dance with an industry recognised assessment specifi cation.

• Servicing shall only be performed as recommended by the equipment manufacturer.
Maintenance and repair requiring the assistance of other skilled personnel shall be
carried out under the supervision of the person competent in the use of fl ammable
refrigerants.

• Servicing shall be performed only as recommended by the manufacturer.

2-2 Work

• Prior to beginning work on systems containing fl ammable refrigerants, safety checks
are necessary to ensure that the risk of ignition is minimized. For repair to the refrig­erating system, the precautions in 2-2 to 2-8 shall be complied with prior to conduct­ing work on the system.

• Work shall be undertaken under a controlled procedure so as to minimize the risk of
a fl ammable gas or vapour being present while the work is being performed.

• All maintenance staff and others working in the local area shall be instructed on the
nature of work being carried out.

• Work in confi ned 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 fl am-
mable material.

2-3 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 fl ammable atmospheres.

• Ensure that the leak detection equipment being used is suitable for use with fl am-
mable refrigerants, i.e. nonsparking, adequately sealed or intrinsically safe.

2-4 Presence of fi re extinguisher

• If any hot work is to be conducted on the refrigeration equipment or any associated
parts, appropriate fi re extinguishing equipment shall be available at hand.

• Have a dry powder or CO

2-5 No ignition sources

• No person carrying out work in relation to a refrigeration system which involves
exposing any pipe work that contains or has contained fl ammable refrigerant shall
use any sources of ignition in such a manner that it may lead to the risk of fi re or
explosion.

• All possible ignition sources, including cigarette smoking, should be kept suffi ciently
far away from the site of installation, repairing, removing and disposal, during which
fl ammable 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 fl ammable hazards or ignition risks. “No Smoking” signs shall
be displayed.

2-6 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.

2-7 Checks to the refrigeration equipment

• Where electrical components are being changed, they shall be fi t for the purpose
and to the correct specifi cation.

• 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 fl ammable 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 containing compo­nents, unless the components are constructed of materials which are inherently
resistant to being corroded or are suitably protected against being so corroded.

fi re extinguisher adjacent to the charging area.

2

En-2

CAUTION

2-8 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: this shall be done in a safe manner 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.

3-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 specifi cation, damage to seals, incorrect fi tting of glands, etc.

• Ensure that apparatus is mounted securely.

• Ensure that seals or sealing materials have not degraded such that they no longer
serve the purpose of preventing the ingress of fl ammable atmospheres.

• Replacement parts shall be in accordance with the manufacturer’s specifi cations.

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.

4-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 fl ammable atmosphere.

• The test apparatus shall be at the correct rating.

• Replace components only with parts specifi ed by the manufacturer.

• Other parts may result in the ignition of refrigerant in the atmosphere from a leak.

5-Cabling

• Check that cabling will not be subject to wear, corrosion, excessive pressure, vibra­tion, sharp edges or any other adverse environmental effects.

• The check shall also take into account the effects of aging or continual vibration from
sources such as compressors or fans.

6-Detection of fl ammable 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 fl ame) shall not be used.

7-Leak detection methods

• Electronic leak detectors shall be used to detect fl ammable refrigerants, 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 confi rmed.

• Leak detection fl uids 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 fl ames 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.

CAUTION

8-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 fl ammability is a consid-
eration.
The following procedure shall be adhered to:

• 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 “fl ushed” 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 this task.

• Flushing shall be achieved by breaking the vacuum in the system with OFN and
continuing to fi ll until the working pressure is achieved, then venting to atmosphere,
and fi nally pulling down to a vacuum.

• This process shall be repeated until no refrigerant is within the system.

• When the fi nal 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
there is ventilation available.

9-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 overfi ll the refrigeration system.

• Prior to recharging the system it shall be pressure tested with OFN.

• 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.

10-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 prior to re-use 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.
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 overfi ll 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 fi lled 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 un-

less it has been cleaned and checked.

11-Labelling

• Equipment shall be labelled stating that it has been de-commissioned and emptied
of refrigerant.

• The label shall be dated and signed.

• Ensure that there are labels on the equipment stating the equipment contains fl am-
mable refrigerant.

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CAUTION

12-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
fl ammable 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 fl ammable 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.

Explanation of symbols displayed on the indoor unit or outdoor unit.

This symbol shows that this appliance uses a fl ammable

WARNING

CAUTION

CAUTION

CAUTION

refrigerant.
If the refrigerant is leaked and exposed to an external igni­tion source, there is a risk of fi re.

This symbol shows that the operation manual should be
read carefully.

This symbol shows that a service personnel should be
handling this equipment with reference to the installation
manual.

This symbol shows that information is available such as
the operating manual or installation manual.

2. PRODUCT SPECIFICATION

2. 1. Installation tools

Tool name Change from R22 to R32 (R410A)

Pressure is high and cannot be measured with a R22

Gauge manifold

Charge hose

Vacuum pump

Gas leakage detector

Copper pipes

It is necessary to use seamless copper pipes and it is desirable that the amount of residual
oil is less than 40 mg/10 m. Do not use copper pipes having a collapsed, deformed or
discolored portion (especially on the interior surface). Otherwise, the expansion value or
capillary tube may become blocked with contaminants.
As an air conditioner using R32 (R410A) incurs pressure higher than when using R22, it is
necessary to choose adequate materials.

gauge. To prevent erroneous mixing of other refrigerants,
the diameter of each port has been changed.
It is recommended to use gauge with seals -0.1 to 5.3 MPa
(-1 to 53 bar) for high pressure.

-0.1 to 3.8 MPa (-1 to 38 bar) for low pressure.

To increase pressure resistance, the hose material and
base size were changed. (R32/R410A)

A conventional vacuum pump can be used by installing a
vacuum pump adapter.
(Use of a vacuum pump with a series motor is prohibited.)

Special gas leakage detector for HFC refrigerant R410A or
R32.

WARNING

• Do not use the existing (for R22) piping and fl are nuts.
If the existing materials are used, the pressure inside the refrigerant cycle will rise and
cause failure, injury, etc. (Use the special R32/R410A materials.)

• Use (refi ll or replace with) specifi ed refrigerant (R32) only. Use of unspecifi ed refriger-
ant can cause product malfunction, burst, or injury.

• Do not mix any gas or impurities except specifi ed refrigerant (R32). Infl ow of air or ap-
plication of unspecifi ed material makes the internal pressure of the refrigerant cycle too
high, and may cause product malfunction, burst of piping, or injury.

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

• Do not turn on the power until all work has been completed.

CAUTION

This manual describes how to install the indoor unit only. To install the outdoor unit or
branch box, (if any), refer to the installation manual included in each product.

2. 2. Accessories

WARNING

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

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

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

Name and Shape Q’ty Description

Operating Manual

1

Operating Manual
(CD-ROM)

Installation Manual
(indoor unit)

Special nut A
(large fl ange)

Special nut B
(small fl ange)

Washer

Coupler heat insulation (large)

Coupler heat insulation (small)

Cable tie (large)

Cable tie (medium)

Cable tie (small)

Drain hose insulation

Drain hose

Hose Band

1

1(This book)

4

For suspending the indoor unit

4

from ceiling

8

For indoor side pipe joint

1

(gas pipe)

For indoor side pipe joint

1

(liquid pipe)

4For fi xing the heat insulation

For fi xing the remote controller

1

cable

For fi xing the remote controller

1

cable

Insulates the drain hose and

1

vinyl hose

For installing drain pipe

1

VP25 (O.D.32, I.D.25)

1 For installing drain hose

En-4

2. 3. Pipe requirement

CAUTION

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

External input and output
PCB bracket

External connect kit UTY-XWZXZG For control output port

Air fi lter kit UTD-LFNA/B/C

UTZ-GXNA

For installing the External input
and output PCB

LFNA : 36/45/54 model
LFNB : 18/22/24/30 model
LFNC : 12/14 model

Model

12/14 9.52 (3/8) 6.35 (1/4)

18/22/24 12.70 (1/2) 6.35 (1/4)

30/36/45/54 15.88 (5/8) 9.52 (3/8)

• Use pipe with water-resistant heat insulation.

Diameter [mm (in)]

Gas pipe Liquid pipe

CAUTION

• Wrap heat insulation around both gas pipe and liquid pipe.
No heat-insulation work or incorrect heat-insulation work may cause water leaks.

• In a reverse cycle model, use heat insulation with heat resistance above 120 °C.

• If expected humidity of the installation location of refrigerant pipes is higher than
70 %, wrap the heat insulation around the refrigerant pipes.
If the expected humidity is between 70 % and 80 %, use heat insulation that has
a thickness of 15 mm or more.
If the expected humidity is higher than 80 %, use heat insulation that has a
thickness of 20 mm or more.

• The use of thinner heat insulation than specifi ed above, may cause a condensation
on the surface of the insulation.

• Use heat insulation with thermal conductivity of 0.045 W/(

m•K

) or less, at 20 °C.

2. 4. Electrical requirement

The indoor unit is powered from the outdoor unit. Do not power indoor unit from separate
power source.

WARNING

Standard for electrical wiring and equipment differs in each country or region. Before
you start electrical working, confi rm related regulations, codes, or standards.

Conductor size

Cable

Connection cable 1.5 (MIN.) Type 60245 IEC57

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

Cable

Remote controller
cable
(2-wire type)

Remote controller
cable
(3-wire type)

2

)

(mm

Conductor size

2

)

(mm

0.33 to 1.25

0.33

Type

Type

Sheathed PVC

cable

Sheathed PVC

cable

Remarks

3Wire+Earth (Ground),

1φ 230V

Remarks

Non-polar 2-wired,

twisted pair

Polar 3-wired

2. 5. Optional parts

Refer to each installation manual for the method of installing optional parts.

Parts name Model No. Application

UTY-RNRZ

Wired remote controller

W-LAN interface UTY-TFSXZ1 For wireless LAN control

IR receiver unit UTY-LBTM For air conditioner operation

Remote sensor UTY-XSZX Room temperature sensor
External input and output

PCB

UTY-RLR

UTY-RVNM

UTY-RNNM

UTY-XCSX



For air conditioner operation



(2-wired type)

For air conditioner operation
(3-wired type)

For connecting external
devices

3. INSTALLATION WORK

WARNING

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

• Carrying and installation of the unit should be performed by a suffi cient number of
people and with suffi cient equipment that is adequate for the weight of the unit.
Performing such work with an insuffi cient number of people or with inadequate equip-
ment could result in dropping of the unit or personal injury.

CAUTION

For installation details, refer to the technical data.

3. 1. Selecting an installation location

Decide the mounting position together with the customer as follows.

WARNING

Install the indoor unit where is capable to support the weight of the unit. Secure the
unit fi rmly so that the unit does not topple or fall.

CAUTION

Do not install the unit in the following areas:

– Area with high salt content, such as at the seaside. It will deteriorate metal parts,

causing the parts to fail or the unit to leak water.

– Area fi lled with mineral oil or containing a large amount of splashed oil or steam,

such as a kitchen. It will deteriorate plastic parts, causing the parts to fail or the unit

to leak water.
– Area where is close to heat sources.
– Area that generates substances that adversely affect the equipment, such as sulfuric

gas, chlorine gas, acid, or alkali. It will cause the copper pipes and brazed joints to

corrode, which can cause refrigerant leakage.
– Area that can cause combustible gas to leak, contains suspended carbon fi bers or

fl ammable dust, or volatile in fl ammables such as paint thinner or gasoline.
– If gas leaks and settles around the unit, it can cause a fi re.
– Area where animals may urinate on the unit or ammonia may be generated.

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

• Install the unit where drainage does not cause any trouble.

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

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

• Install the unit where ambient temperature does not reach 60°C or more.
Take a measure such as ventilation for an environment in which heat is retained.

(1) The inlet and outlet ports should not be obstructed; the air should be able to blow all

over the room.
(2) Leave the space required to service the air conditioner.
(3) Install the unit where connection to the outdoor unit is easy.
(4) Install the unit where the connection pipe can be easily installed.
(5) Install the unit where the drain pipe can be easily installed.
(6) Install the unit where noise and vibrations are not amplifi ed.
(7) Take servicing, etc., into consideration and leave the spaces. Also install the unit where

the fi lter can be removed.
(8) Do not install the unit where it will be exposed to direct sunlight.

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

En-5

3. 2. Installation dimension

Unit: mm

CAUTION

Confi rm the directions of the air intake and outlet before installing the unit.
The unit takes in air from the evaporator side, and expels it from the fan side.

20 or more

150 or
more

Provide a service access for maintenance purposes.

20 or more

2500 or more
(When no ceiling)

300 or more

(Bottom side) Unit: mm

AIR

Service access

300 or more

Control box

500 or more

3. 3. 1. Position the ceiling hole

Hanging bolt installation diagram.

Unit: mm
(Top side)

750

700

630

C

B

A

500 or more

* The service access necessary for fan units and fi lter maintenance.

(Bottom side) Unit: mm

AIR

Service access

Fan unit side

100

100 or more

300 or more

500 or more

3. 3. Installing the unit

WARNING

• Carrying and installation of the unit should be performed by a suffi cient number
of people and with suffi cient equipment that is adequate for the weight of the unit.
Performing such work with an insuffi cient number of people or with inadequate
equipment could result in dropping of the unit or personal injury.

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

• When fastening the hangers, make the bolt positions uniform.

Model

12/14 700 740 800

18/22/24/30 1000 1040 1100

36/45/54 1400 1440 1500

AB

Dimension (mm)

(Right side)

25

218

57

3. 3. 2. Body installation

Special nut A
(Accessory)

Hanging bolt M10
(Locally purchased)

Washer
(Accessory)

Special nut B
(Accessory)

Hanger

222

C

22

256

22

En-6

Bolt Strength 9.81 to 14.71 N·m (100 to 150 kgf·cm)

CAUTION

Fasten the unit securely with special nuts A and B so that the unit does not fall.

3. 3. 3. Leveling

Base vertical direction leveling on the unit (right and left).

(Right side)

Level

CAUTION

• Make sure the drain water is properly drained.

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

• Set the appropriate external static pressure within the permissible range. (Refer to
“6. FUNCTION SETTING”)

• If an intake duct is installed, take care not to damage the temperature sensor (the
temperature sensor is attached to the intake port fl ange).

• Be sure to Install the air inlet grille and air outlet grille for air circulation. The correct
temperature cannot be detected.

AIR

Base horizontal direction leveling on top of the unit.

Level

0 – 5 mm

Give a slight tilt to the side to which the drain hose is connected. The tilt should be in the
range of 0 mm to 5 mm.

AIR

Drain hose

3. 4. Intake duct connection

Follow the procedure in the following fi gure.
*12/14/36/45/54 model is different from the fi gure.
(Back side)

300 mm

The air inlet duct can be changed by replacing the intake grille and service panel.

12/14 model : 700 mm
18/22/24/30 model : 1000 mm
36/45/54 model : 1400 mm

Unit

Duct

Air Outlet Grille

(Field supply)

(Room)

• When connecting the duct, perform duct-insulation appropriate for the installing
environment.
Inappropriate insulation work may cause condensation on the surface of the insulat­ing material, and may lead to condensation dripping.

(Field supply)

Air Inlet Grille
(Field supply)

3. 5. Drain installation

CAUTION

• Install the drain hose in accordance with the instructions in this installation manual
and keep the area warm enough to prevent condensation. Problems with the piping
may lead to water leaks.

• Be sure to properly insulate the drain hose so that the water will not drip from the
connected parts.

• The position of the installed drain hose should have a downward gradient of 1/100 or
more.

• Do not connect the drain hose in which ammonia or other types of gas affecting the
unit is generated. Heat exchange erosion may occur.

Install the drain hose according to the measurements given in the following fi gure.

Unit: mm

(Right side)

Drain pipe
Ø32 mm (O.D.)

280

40

65

For the bottom air intake, position (1) the intake grille, and (2) the service panel, as shown
in the following fi gure. (The factory setting is back air intake.)

(2)

(1)

232

128

300

Drain pipe
Ø32 mm (O.D.)

145

29

3. 5. 1. Installing the drain hose

(1) Install the drain hose (accessory) to the drain port of the indoor unit. Attach the hose

band around the hose within the dimension shown. Secure fi rmly with the hose band.

(2) Attach the drain pipe (locally purchased). Use general hard polyvinyl chloride pipe

(VP25) [outside diameter 32 mm] and connect it with adhesive (polyvinyl chloride) so

that there is no leakage.
(3) Check the drainage.
(4) Wrap the drain hose insulation around the drain hose connection.

Hose band (Accessory)

15 mm

Soft PVC side

5~10 mm

20 mm

Drain hose

Area to
apply
adhesive

4 mm or less

Joint pipe
(Locally purchased)

Drain pipe (VP25)
(Locally purchased)

(Accessory)

En-7

Indoor unit

Drain hose insulation
(Accessory)

100 mm

Drain hose

Hose band (Accessory)

Drain hose insulation
(Accessory)

Overlap the heat insulation.

Outlet

GOOD

airfl ow

Arrange the drain pipe
lower than this portion

• When the pipe is long, install supporters.

Drain
pipe

PROHIBITED

Supporter

1.5 to 2 m

■When drain pump is used

Gap of 1.5 to 2 m

Locally arranged pipe

GOOD

Max.

300 mm

VP25 [O.D
32 mm or more]

Supporter

700 mm or
less

Horizontal or
upward gradient

Air bleeding

PROHIBITED

Rise

Trap

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

VP30 or more [O.D 38 mm or more]

Downward gradient 1/100 or more

700 mm or less

■When drain pump is not used (Natural drainage)

If the drain pump is not used, please move the position of the drain cap and insulation.

Trap

Rise

Air bleeding

3. 5. 2. Check for drainage

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

CAUTION

Make sure the drain water is properly drained.

3. 6. Pipe installation

WARNING

• During installation, make sure that the refrigerant pipe is attached fi rmly before you
run the compressor.
Do not operate the compressor under the condition of refrigerant piping not attached
properly with 2-way or 3-way valve open. This may cause abnormal pressure in the
refrigeration cycle that leads to breakage and even injury.

• During the pump-down operation, make sure that the compressor is turned off before
you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.

• When installing and relocating the air conditioner, do not mix gases other than the
specifi ed refrigerant (R32) to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to
an abnormally high value and cause breakage, injury, etc.

• If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant
comes in contact with a fl ame, it produces a toxic gas.

NOTE:

• Install the drain pipe with downward gradient (1/50 to 1/100) and so there are no rises or
traps in the pipe.

En-8

CAUTION

• Be more careful so that foreign matter (oil, water, etc.) does not enter the piping than
with refrigerant R32 models. Also, when storing the piping, securely seal the openings
by pinching, taping, etc.

• While brazing the pipes, be sure to blow dry nitrogen gas through them.

3. 6. 1. Pipe connection

■Flaring

Use special pipe cutter and fl are tool designed for R410A or R32 pipework.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3) Insert the fl are nut (always use the fl are nut attached to the indoor unit(s) and outdoor

unit or branch box respectively) onto the pipe and perform the fl are processing with a
fl are tool. Use the special R410A or R32 fl are tool, or the conventional fl are tool. Leak-
age of refrigerant may result if other fl are nuts are used.

(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from

entering the pipes.

B

Die

Check if [L] is fl ared uniformly
and is not cracked or scratched.

A

Pipe

Pipe outside

diameter

[mm (in.)]

6.35 (1/4)

9.52 (3/8) 13.2

12.70 (1/2) 16.6

15.88 (5/8) 19.7

19.05 (3/4) 24.0

When using conventional fl are tools to fl are R32 pipes, the dimension A should be
approximately 0.5 mm more than indicated in the table (for fl aring with R32 fl are tools) to
achieve the specifi ed fl aring. Use a thickness gauge to measure the dimension A.

Width across

NOTE: The fl are nut specifi cation is compliant with ISO14903.

Dimension A [mm]

Flare tool for R32,

fl ats

clutch type

0 to 0.5

diameter [mm (in.)]

L

Dimension B

Pipe outside

[mm]

-00.4

9.1

Width across fl ats

of Flare nut [mm]

6.35 (1/4) 17

9.52 (3/8) 22

12.70 (1/2) 26

15.88 (5/8) 29

19.05 (3/4) 36

■Bending pipes

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

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

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

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

CAUTION

• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 150 mm or over.

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

■Flare connection

CAUTION

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

• Do not remove the fl are nut from the indoor unit pipe until immediately before
connecting the connection pipe.

• Do not use mineral oil on fl ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.

CAUTION

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

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

Tighten with 2 wrenches.

Holding Wrench

Torque wrench

Indoor unit pipe
(Body side)

Flare nut

Connection pipe

Flare nut [mm (in.)] Tightening torque [N·m (kgf·cm)]

6.35 (1/4) dia. 16 to 18 (160 to 180)

9.52 (3/8) dia. 32 to 42 (320 to 420)

12.70 (1/2) dia. 49 to 61 (490 to 610)

15.88 (5/8) dia. 63 to 75 (630 to 750)

19.05 (3/4) dia. 90 to 110 (900 to 1,100)

3. 7. Fresh air intake

■Processing before use

(1) When taking in fresh air, cut out the slit of the cabinet on the left side of the outer case

with nippers.

• When removing the cabinet (iron plate), be careful not to damage the indoor unit
internal parts and surrounding area (outer case).

• When processing the cabinet (iron plate), be careful not to injure yourself with burrs,
etc.

• When using the Fresh air intake, set the Room temperature sensor switching (Aux.)
to “Wired Remote Controller” (01), or to use the Remote sensor.

(2) Install the round fl ange to the fresh air intake.

Slit

Cabinet (iron plate)

CAUTION

(1) Detach the caps and plugs from the pipes.
(2) Centering the pipe against port on the indoor unit, turn the fl are nut with your hand.
(3) When the fl are nut is tightened properly by your hand, hold the body side coupling with

a separate spanner, then tighten with a torque wrench. (See the table below for the
fl are nut tightening torques.)

Round fl ange (Locally purchased)

(3) Connect the duct to the round fl ange.

(4) Seal with a band and vinyl tape, etc. so that air does not leak from the connection.

Duct

En-9

3. 8. Electrical wiring

WARNING

• Electrical work must be performed in accordance with this Manual by a person
certifi ed under the national or regional regulations. Be sure to use a dedicated circuit
for the unit.
An insuffi cient power supply circuit or improperly performed electrical work can cause
serious accidents such as electric shock or fi re.

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

• Use the included connection cables and power cables or ones specifi ed by the
manufacturer. Improper connections, insuffi cient insulation, or exceeding the
allowable current can cause electric shock or fi re.

• For wiring, use the prescribed type of cables, connect them securely, making sure
that there are no external forces of the cables applied to the terminal connections.
Improperly connected or secured cables can cause serious accidents such as
overheating the terminals, electric shock, or fi re.

• Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insuffi cient insulation, or exceeding the allowable
current can cause electric shock or fi re.

• Match the terminal board numbers and connection cable colors with those of the
outdoor unit. Erroneous wiring may cause burning of the electric parts.

• Securely connect the connection cables to the terminal board. In addition, secure the
cables with wiring holders. Improper connections, either in the wiring or at the ends of
the wiring, can cause a malfunction, electric shock, or fi re.

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

• Securely install the electrical box cover on the unit. An improperly installed electrical
box cover can cause serious accidents such as electric shock or fi re through
exposure to dust or water.

• Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.

• Install a ground leakage breaker. In addition, install the ground leakage breaker so
that the entire AC main power supply is cut off at the same time. Otherwise, electric
shock or fi re could result.

• Always connect the earth (ground) cable.
Improper earthing (grounding) work can cause electric shocks.

• Install the remote control cables so as not to be touched directly with your hand.

• Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.

• Connect the connection cable fi rmly to the terminal board. Imperfect installation may
cause a fi re.

CAUTION

• Ground the unit.
Do not connect the earth (ground) cable to a gas pipe, water pipe, lightning rod, or a
telephone earth (ground) cable.
Improper earthing (grounding) may cause electric shocks.

• Do not connect power supply cables to the transmission or remote control terminals,
as this will damage the product.

• Never bundle the power supply cable and transmission cable together. Bundling
these cables together will cause miss operation.

• When handling PCB, static electricity charged in the body may cause malfunction of
the PCB. Follow the cautions below:

– Establish a ground for the indoor and outdoor units and peripheral devices.
– Cut power (breaker) off.
– Touch metal part of the indoor and outdoor units for more than 10 seconds to dis-

charge static electricity charged in the body.

– Do not touch terminals of parts and patterns implemented on PCB.

3. 8. 1. Wiring system diagram

■Connection cable (to outdoor unit)

Earth (ground)

Power line

Control line

■Wired remote controller cable

Red

White

2-wire type

or

Red
White
Black

3-wire type

3. 8. 2. Connection cable preparation

■Connection cable

Keep the earth (ground) wire longer than the other wires.

30 mm

Earth (ground) wire

• Use a 4-core wire cable.

70 mm or more

Connection cable

■Remote controller cable

For 2-wire type

30 mm 30 mm

For 3-wire type

3. 8. 3. How to connect wiring to the terminals.

(1) Use ring terminals with insulating sleeves as shown in the fi gure below to connect to

the terminal block.

(2) Securely crimp the ring terminals to the wires using an appropriate tool so that the

wires do not come loose.

Ring
terminal

Strip 10 mm

Sleeve

(3) Use the specifi ed wires, connect them securely, and fasten them so that there is no

stress placed on the terminals.

(4) Use an appropriate screwdriver to tighten the terminal screws.

Do not use a screwdriver that is too small, otherwise, the screw heads may be

damaged and prevent the screws from being properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the screws may break.
(6) See the table below for the terminal screw tightening torques.

WARNING

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

Tightening torque [N·m (kgf·cm)]

M4 screw 1.2 to 1.8 (12 to 18)
M5 screw 2.0 to 3.0 (20 to 30)

Wire

Screw with
special washer

Ring
terminal

Terminal blocks

Wire

Screw with
special
washer

Ring
terminal

3. 8. 4. Connection wiring

CAUTION

• Be careful not to mistake the power supply cable and connection wires when
installing.

• Install so that the wires for the remote controller will not come in contact with other
connection wires.

(1) Remove the control box cover and install each connection wire.

Control box cover

Loosen the screws.(3 locations)

En-10

■Connection cable

Control line

Power line

4. OPTIONAL INSTALLATION WORK

4. 1. Optional kit installation

WARNING

Regulation of cable differs from each locality, refer in accordance with local rules.

CN8 (Remote sensor)

Outdoor

Earth (ground)

unit

Connection
cable

■Remote controller cable

DIP switch

Print circuit board

(PCB)

2-wire type

White

Red

Remote
controller
cable

Remote controller

Factory setting “2 WIRE”

*Earth (Ground) the remote controller if it has a earth (ground) wire.

(2) After wiring is complete, secure the remote controller cable, connection cable, and

power supply cable with the cable clamps.

Connecting the
Optional parts

3-wire type

Black

White

Red

Remote controller

Set to “3 WIRE”

Remote
controller
cable

CN48

Y1 Y2 Y3 1 2Y1 Y2 Y3 1 2

Terminal

(External in)

This air conditioner can be connected with the following optional kits.
For details on how to install optional parts, refer to the installation manual included in each
item.

Connector No. Option type

CN48 IR Receiver (UTY-LBTM)

CN8 Remote sensor (UTY-XSZX)
CN47*1 Connect wire (UTY-XWZXZG)
CN65*2 External input and output PCB (UTY-XCSX)

*1:

For external output terminal setting, refer to Function No.60 in “6. FUNCTION SETTING”.

*2: Other options (WLAN adapter, converters, etc.) may be available by using the optional

External input and output PCB.

(IR receiver)

CN65

(External in/out PCB)

CN47

(External out)

4. 2. External input and output

4. 2. 1. External input

• Indoor unit functions such as Operation/Stop or Forced stop can be done by using
indoor unit terminals.

• “Operation/Stop” mode or “Forced stop” mode can be selected with function setting of
indoor unit.

•

A twisted pair cable (22 AWG) should be used. Maximum length of cable is 150 m (492 ft.).

• Use an external input and output cable with appropriate external dimension, depending
on the number of cables to be installed.

• The wire connection should be separate from the power cable line.

Ter min al

Cable tie (medium)
(Accessory)

Control box

Remote controller
cable

(3) Seal the cable outlet or other gaps with putty to prevent dew condensation or insect

from entering the electric control box.

(4) Replace the control box cover.

CAUTION

Do not bundle the remote controller cable, or wire the remote controller cable in parallel,
with the indoor unit connection wire (to the outdoor unit) and the power supply cable. It
may cause erroneous operation.

Connection cable
(to outdoor unit)

3. 9. Remote controller installation

To install and set the remote controller, refer to the installation manual of the remote
controller (wired type).

Connected device

● Dry contact terminal

When a power supply is unnecessary at the input device you want to connect, use the Dry
contact terminal.

*1

Connected device

*1: The switch can be used on the following condition: DC 12 V to 24 V, 1 mA to 15 mA.

PCB

Ter minal
(External in)

■Operation behavior

● Input signal type

ON

Edge

OFF

When function setting is “Operation/Stop” mode 1.

Input signal Command

OFF → ON Operation

ON → OFF Stop

En-11

When function setting is “Forced stop” mode.

Input signal Command

OFF → ON Forced stop

ON → OFF Normal

* When the forced stop is triggered, indoor unit stops and Operation/Stop operation by a

remote controller is restricted.

When function setting is "Operation/Stop" mode 2.

Input signal Command

OFF → ON Operation

ON → OFF Stop (R.C. disabled)

4. 2. 2. External output

• A twisted pair cable (22AWG) should be used. Maximum length of cable is 25 m (82 ft.).

• Use an external input and output cable with appropriate external dimension, depending
on the number of cables to be installed.

• Output voltage: Hi DC12V±2V, Lo 0V.

• Permissible current: 50mA

■Output select

● When interlocking with external device

Connected

device

Relay (locally purchased)

PCB

CN47

or

● When displaying "Operation/Stop"

Resistor

LED

Connected device

PCB

CN47

■Operation behavior

*If function setting "60" is set to "00"

Function setting Status Output voltage

00

09

60

10

11

Stop 0V

Operation DC 12 V

Normal 0V

Error DC 12 V

Indoor unit fan stop 0V

Indoor unit fan operation DC 12 V

External heater OFF 0 V

External heater ON DC 12V

4. 2. 3. Connection methods

■Wire modifi cation

• Remove insulation from wire attached to wire kit connector.

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

• Connect the wire with connecting wire with solder.

IMPORTANT: Be sure to insulate the connection between the wires.

Option parts

Locally purchased

Solder and insulate the connected parts.

• Connecting wires to the terminals.

Use ring terminals with insulating sleeves to connect to the terminal block.

• Connection terminals and wiring arrangement

In following fi gure, all the possible connections are done for description.
In actual installation, connections will differ according to each installation requirements.

External output wire

4. 3. Remote sensor

Remote sensor

• Remove the existing connector and replace it with the remote sensor connector (ensure
that the correct connector is used).

• The original connector should be insulated to ensure that it does not come into contact
with other electrical circuitry.

Setting for room temperature correction
When a remote sensor is connected, set the function setting of indoor unit as indicated
below.

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

• Set Function Number “31” (Room temperature control for heating) to “01”

5. REMOTE CONTROL INSTALLATION

CAUTION

• Be sure to turn off the electrical breaker before making settings.

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

5. 1. Group control

CAUTION

Group control is only possible between units with remote controllers of the same type.
To confi rm the type of remote controller, see the back of the remote controller or
“2. 5. Optional parts”.

A number of indoor units can be operated at the same time using a single remote controller.
(1) Connect up to 16 indoor units in a system. (indoor unit to remote controller)

I.U. I.U. I.U. I.U.

BCDE

A

Remote
controller

A, B, C, D, E : Remote controller cable. (Refer to “2. 4. Electrical requirement”)
A+B+C+D+E ≤ 500 m.
Example of wiring method (2-wire type)

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4

123 123 123 123

123

R W B

Remote controller

(2) Set the R.C. address (DIP switch setting)
Set the R.C. address of each indoor unit using the DIP switch on the indoor unit

circuit board.

Remote controller
cable

SW100

(a) 2-wire type

DIP switch (RC AD SW)...Factory setting “00”
Since the remote controller address settings are automatically confi gured, you do not
need to confi gure them.
If confi guring manually, it is necessary to confi gure both the indoor unit and the remote
controller. For details, please refer to the remote controller installation manual.

(b) 3-wire type

DIP switch (RC AD SW)...Factory setting “00”

When connecting multiple indoor units to 1 standard wired remote controller, set the

address at RC AD SW in sequence from “00”.

Setting Setting range Switch 100

Remote controller
address

00 to 15

Setting
example 00

Remote controller
cable

ON

1234

RC AD

En-12

Example

Set the R.C. address in accordance with the table below.

Indoor unit

NOTE:

Be sure to set consecutive R.C. address.
The indoor units cannot be operated if a number is skipped.

If 4 indoor units are connected.

Indoor unit 1

RC AD SW

00

R.C. address

1 00 OFF OFF OFF OFF
2 01 ON OFF OFF OFF
3 02 OFF ON OFF OFF
4 03 ON ON OFF OFF
5 04 OFF OFF ON OFF
6 05 ON OFF ON OFF
7 06 OFF ON ON OFF
8 07 ON ON ON OFF

9 08 OFF OFF OFF ON
10 09 ON OFF OFF ON
11 10 OFF ON OFF ON
12 11 ON ON OFF ON
13 12 OFF OFF ON ON
14 13 ON OFF ON ON
15 14 OFF ON ON ON
16 15 ON ON ON ON

Indoor unit 2 Indoor unit 3 Indoor unit 4

Remote
controller

RC AD SW

01

RC AD SW

02

DIP SWITCH No.

1234

RC AD SW

03

5. 2. Multiple remote control

Up to 2 remote controllers can be used to operate one indoor unit

CAUTION

Multiple installation method described above is prohibited to combine 3 Wired type with
2 Wired Type.

I.U.

A

I.U.

AB

6. FUNCTION SETTING

To change the function settings, refer to the procedures described in the installation
manual of the remote controller (wired type).
The function settings are as follows.

6. 1. Function details

■Filter sign

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

(♦... Factory setting)

Function

Number

11

■Room temperature control for indoor unit sensor

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

Function Number

30

(For cooling)31(For heating)

Setting

Value

00 Standard (2500 hours)
01 Long interval (4400 hours)
02 Shor t interval (1250 hours)
03 No indication ♦

Setting

Value

00 Standard setting ♦
01 No correction 0.0 °C (0 °F)
02 -0.5 °C (-1 °F)
03 -1.0 °C (-2 °F)
04 -1.5 °C (-3 °F)
05 -2.0 °C (-4 °F)
06 -2.5 °C (-5 °F)
07 -3.0 °C (-6 °F)
08 -3.5 °C (-7 °F)
09 -4.0 °C (-8 °F)
10 +0.5 °C (+1 °F)
11 +1.0 °C (+2 °F)
12 +1.5 °C (+3 °F)
13 +2.0 °C (+4 °F)
14 +2.5 °C (+5 °F)
15 +3.0 °C (+6 °F)
16 +3.5 °C (+7 °F)
17 +4.0 °C (+8 °F)

Setting Description

(♦... Factory setting)

Setting Description

More

Cooling

Less

Heating

Less

Cooling

More

Heating

Primary Primary Secondary

A, B : Remote controller cable. (Refer to “2. 4. Electrical requirement”)
A ≤ 500 m, A+B ≤ 500 m

5. 3. DIP switch 101 setting

■Fan delay setting

This setting can be used when the auxiliary heater is mounted.
When the operation is stopped when the indoor unit is operating with an auxiliary heater,
the operation continues 1 minutes.

■Drainage function setting

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

Change the following settings by using the DIP switch.

SW101

(♦... Factory setting)

DIP switch 101

1 Disable Enable ♦ Drainage function setting
2 - - Cannot be used (Do not Change)
3 Enable Disable ♦ Fan delay setting

DIP SW state

ON OFF

Details

■Room temperature control for wired remote controller sensor

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

Function number

35

(For cooling)36(For heating)

Setting

value

00 No correction ♦
01 No correction 0.0 °C (0 °F)
02 -0.5 °C (-1 °F)
03 -1.0 °C (-2 °F)
04 -1.5 °C (-3 °F)
05 -2.0 °C (-4 °F)
06 -2.5 °C (-5 °F)
07 -3.0 °C (-6 °F)
08 -3.5 °C (-7 °F)
09 -4.0 °C (-8 °F)
10 +0.5 °C (+1 °F)
11 +1.0 °C (+2 °F)
12 +1.5 °C (+3 °F)
13 +2.0 °C (+4 °F)
14 +2.5 °C (+5 °F)
15 +3.0 °C (+6 °F)
16 +3.5 °C (+7 °F)
17 +4.0 °C (+8 °F)

(♦... Factory setting)

Setting description

More

Cooling

Less

Heating

Less

Cooling

More

Heating

En-13

■Auto restart

Enable or disable automatic restart after a power interruption.

(♦... Factory setting)

Function

Number

40

* Auto restart is an emergency function such as for power outage etc. Do not attempt to

use this function in normal operation. Be sure to operate the unit by remote controller or
external device.

Setting

Value

00 Enable ♦
01 Disable

Setting Description

■Room temperature sensor switching

(Only for wireless remote controller)
When using the Wired remote controller temperature sensor, change the setting to "Both"
(01).

Function

Number

42

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

Remote controller sensor must be turned on by using the remote controller

Setting

Value

00 Indoor unit ♦
01 Both

Setting Description

(♦... Factory setting)

■Cold air prevention

*This setting is to disable the cold air prevention function during heating operation. When
disabled, the fan setting will always follow the setting on the remote controller. (Excluding
defrost mode).

Function

Number

43

Setting

Value

00 Enable ♦
01 Disable

Setting Description

(♦... Factory setting)

■External input control

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

Function

Number

46

Setting

Value

00 Operation/Stop mode 1
01 (Setting prohibited)
02 Forced stop mode
03 Operation/Stop mode 2

Setting Description

(♦... Factory setting)

♦

■Room temperature sensor switching (Aux.)

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

Function

Number

48

Setting

Value

00 Both ♦
01 Wired remote controller

Setting Description

(♦... Factory setting)

■Indoor unit fan control for energy saving for cooling

Enables or disables the power-saving function by controlling the indoor unit fan rotation
when the outdoor unit is stopped during cooling operation.

Function

Number

49

00: When the outdoor unit is stopped, the indoor unit fan operates continuously following

the setting on the remote controller.

01: When the outdoor unit is stopped, the indoor unit fan operates intermittently at a very

low speed.

02: Enable or disable this function by remote controller setting.

*When using a wired remote controller without Indoor unit fan control for energy saving for

cooling function, or when connecting a single split converter, the setting cannot be made
by using the remote controller. Set to "00" or "01".

To confi rm if the remote controller has this function, refer to the operating manual of each

remote controller.

Setting

Value

00 Disable
01 Enable
02 Remote controller ♦

Setting description

(♦... Factory setting)

■Switching functions for external output terminal

Functions of the external output terminal can be switched.

Function Number

60

Setting

Value

00 Operation status ♦

01 to 08 (Setting prohibited)

09 Error status
10 Fresh air control
11 Auxiliary heater

Setting Description

(♦... Factory setting)

■Setting record

• Record any changes to the settings in the following table.

Function setting

Filter sign
Static pressure

Room temperature control for indoor unit sensor

Room temperature control for wired remote
controller sensor

Auto restart
Room temperature sensor switching
Cold air prevention
External input control
Room temperature sensor switching (Aux.)
Indoor unit fan control for energy saving for cooling
Switching functions for external output terminal

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

Setting Value

cooling
heating
cooling
heating

6. 2. Static pressure

The static pressure can be set by the following 2 methods. Choose accordingly.

a. Manual setting (Function setting)

Select the appropriate static pressure according to the installation conditions.

(♦... Factory setting)

Function

Number

26

* The range of static pressure is different by model.
For details, see the Fan performance curve of the technical data.

Setting

Value

03 30 Pa
04 40 Pa
05 50 Pa
06 60 Pa
07 70 Pa
08 80 Pa
09 90 Pa
10 100 Pa
11 110 Pa
12 120 Pa
13 130 Pa
14 140 Pa
15 150 Pa
16 160 Pa
17 170 Pa
18 18 0 Pa
19 19 0 Pa
20 200 Pa

31

32 Automatic air fl ow adjustment

Model name Range of static pressure

12/14/18/22/24/30/36 model 30 to 200 Pa

45/54 model 30 to 160 Pa

Setting Description

Standard (35 Pa: 12/14/18/22/24 model)

(47 Pa: 30/36 model)
(60 Pa: 45/54 model)

♦

En-14

Record the setting value of Function 26 in the Setting record table in “6. 1. Function de-

tails”.

b. Automatic airfl ow adjustment

8. 2. Operation method

CAUTION

• This function cannot be used when there is a booster fan between the ducts.

• Be sure that the static pressure is within the allowed range. Incorrect setting may
cause incorrect adjustment and may result in insuffi cient airfl ow or water leakage.

• When the external static pressure is changeable in the installation by use of
automatic changeable dampers, etc., set so that the external static pressure is the
lowest.

NOTE:

Be sure to conduct this setting before any other operation. If the motor is warm or the heat
exchanger is wet, false detection may lead to incorrect adjustments.
Check if the electrical wirings and duct installations are complete.
If there is a damper installed in the system, make sure the damper is open.
Check if the air fi lter (optional) is attached.
If there are several inlet, outlet ports, make sure the airfl ow rates of each port match the

designed airfl ow rate by adjusting the throttles.

Automatic airfl ow adjustment is possible by the following procedures.

1) Change the setting of Function 26 to "Automatic airfl ow adjustment" (32).

2) Run the air conditioner on Fan mode (High).
* For instructions on how to operate the air conditioner, refer to the operation manual

of the remote controller.
During Automatic airfl ow adjustment, the mode will be fi xed at Fan mode (High).
When this function is active, do not operate the Outdoor unit.

3) The air conditioner will run for about 1 to 8 min. then stop automatically.
* Do not change the throttles of the inlet and outlet ports during operation.
When used in a Group control system, the setting will take about 10 min.

4) Turn the air conditioner off and on again.

5) Check the setting value of Function 26 and record the obtained setting value in the
following table.

* If the setting value has not changed, repeat the procedure from step 1.

Function Number Setting value

26

CAUTION

• If the detected setting value is not within the range of static pressure, please check
and re-arrange the installation, then repeat the procedure from step 1. Incorrect
setting may result in insuffi cient airfl ow or water leakage.

• When the duct or outlet installations are changed after the Automatic airfl ow
adjustment is completed, repeat the procedure from step 1.

7. CHECK LIST

Pay special attention to the check items below when installing the indoor unit(s). After
installation is complete, be sure to check the following check items again.

Check items Check box

Has the indoor unit been installed correctly?
Has there been a check for gas leaks (refrigerant pipes)?
Has heat insulation work been completed?
Does water drain easily from the indoor units?
Is the voltage of the power source the same as that indicated on the label

on the indoor unit?
Are the wires and pipes all connected completely?
Is the indoor unit grounded?
Is the connection cable the specifi ed thickness?
Are the inlets and outlets free of any obstacles?
After installation is completed, has the proper operation and handling

been explained to the user?
Operate the unit according to the operating manual provided, and check

that it is operating normally.

Depending on your installation, choose from the following:

■By the wireless remote controller (with [TEST RUN] button)

• To start test run, press the [START/STOP] button and the [TEST RUN] button on the
remote controller.

• To end test run, press the remote controller [START/STOP] button.

■By the indoor unit or IR receiver unit

• To start test run, press the [MANUAL AUTO] button of the unit for more than 10 seconds
(forced cooling).

• To end test run, press the [MANUAL AUTO] button for more than 3 seconds or press
the remote controller [START/STOP] button.

• The Operation indicator lamp and Timer indicator lamp will simultaneously fl ash during
the test run mode.

■By the wired remote controller

• For the operation method, refer to the installation manual and the operating manual of
the wired remote controller.

Heating test run will begin in a few minutes when HEAT is selected by the remote controller
[reverse cycle model only].

9. FINISHING

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

Coupler heat insulation

Coupler heat insulation
(Accessory)

No gaps

Indoor unit side

Cable ties (large)
(Accessory)

There should be no gaps between the insulation and the product.

• After connecting the piping, check the all joints for gas leakage with gas leak detector.

• Once the pressure checking has been completed using nitrogen, please refer to the

outdoor unit installation manual to complete the evacuation process.

• Install heat insulation around both the large (gas) and small (liquid) pipes. Failure to

do so may cause water leaks.

Be sure to overlap
the insulation.

Pipes

CAUTION

CAUTION

(Gas and liquid pipes)

10. CUSTOMER GUIDANCE

Explain the following to the customer in accordance with the operating manual:
(1) Starting and stopping method, operation switching, temperature adjustment, timer, air

fl ow switching, and other remote controller operations.

(2) Cleaning and maintenance of the product, and other items such as air fi lters and air

louvers if applicable.
(3) Give the operating and installation manuals to the customer.
(4) If the indoor unit custom code is changed, and the installation includes a wireless

remote controller, inform the customer the changed code. (On some wireless remote

controllers, the custom code may return to A when batteries are replaced.)

8. TEST RUN

8. 1. Check items

□ Is operation of each button on the remote control unit normal?
□ Does each lamp light normally?
□ Is the drain normal?
□ Do not have an abnormal noise and vibration during operation?

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

En-15

11. ERROR CODES

If you use a wired type remote controller, error codes will appear on the remote control­ler display. If you use a wireless remote controller, the lamps on the IR receiver unit will
output error codes by way of blinking patterns. See the lamp blinking patterns and error
codes in the table below. An error display is displayed only during operation.
For more details, refer to the installation manual of the remote controller.

OPERATION
lamp (green)

(1)



(1)



(1)



(1)



(1)



(2)



(2)



(2)



(2)



(2)



(2)



(2)



(3)



(3)



(3)



(3)



(3)



(3)



(4)



(4)



(4)



(5)



(5)



(5)



(5)



(6)



Error display

TIMER

lamp

(orange)

(1)



(2)



(5)



(6)



(8)



(1)



(2)



(3)



(4)



(6)



(7)



(9)



(1)



(2)



(3)



(5)



(9)



(10)



(1)



(2)



(4)



(1)



(3)



(7)



(15)



(1)



ECONOMY

lamp

(green)

Wired

remote

controller

Error code

Description

Serial communication error

Wired remote controller
communication error

Check run unfi nished
Automatic airfl ow adjustment error

Peripheral unit transmission PCB
connection error

External communication error

Unit number or Refrigerant circuit
address setting error
[Simultaneous Multi]

Indoor unit capacity error

Combination error

• Connection unit number
error (indoor secondary unit)
[Simultaneous Multi]

• Connection unit number error
(indoor unit or branch unit)
[Flexible Multi]

Indoor unit address setting error

Primary unit, secondary unit setup
error [Simultaneous Multi]

Connection unit number error in
wired remote controller system

Power supply interruption error

Indoor unit PCB model
information error

Indoor unit motor electricity
consumption detection error

Manual auto switch error

Indoor unit power supply error for
fan motor

Indoor unit communication circuit
(wired remote controller) error

Room temp. sensor error

Indoor unit heat ex. middle temp.
sensor error

Human sensor error

Indoor unit fan motor error

Drain pump error

Damper error

Indoor unit error

Outdoor unit reverse/missing
phase and wiring error

OPERATION
lamp (green)

(6)



(6)



(6)



(6)



(6)



(6)



(7)



(7)



(7)



(7)



(7)



(7)



(7)



(8)



(8)



(8)



(8)



(9)



(9)



(9)



(9)



(9)



(9)



(10)



(10)



(10)



(10)



(13)



Display mode

Error display

TIMER

ECONOMY

lamp

(orange)











(10)



































(10)













: 0.5s ON / 0.5s OFF



: 0.1s ON / 0.1s OFF

( ) : Number of fl ashing

lamp

(green)

(2)

(3)

(4)

(5)

(8)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(2)

(3)

(4)

(6)

(4)

(5)

(7)

(8)

(9)

(1)

(3)

(4)

(5)

(2)

Wired

remote

controller

Error code

Description

Outdoor unit main PCB
model information error or
communication error

Inverter error

Active fi lter error, PFC circuit error

Trip terminal L error

Outdoor unit rush current limiting
resister temp. rise error

Display PCB microcomputers
communication error

Discharge temp. sensor error

Compressor temp. sensor error

Outdoor unit Heat Ex. liquid temp.
sensor error

Outdoor temp. sensor error

Suction Gas temp. sensor error

• 2-way valve temp. sensor error

• 3-way valve temp. sensor error
Heat sink temp. sensor error

• Sub-cool Heat Ex. gas inlet
temp. sensor error

• Sub-cool Heat Ex. gas outlet
temp. sensor error

Liquid pipe temp. sensor error

Current sensor error

• Discharge pressure sensor error

• Suction pressure sensor error

• High pressure switch error

Trip detection

Compressor rotor position
detection error (permanent stop)

Outdoor unit fan motor 1 error

Outdoor unit fan motor 2 error

4-way valve error

Coil (expansion valve) error

Discharge temp. error

Compressor temp. error

High pressure error

Low pressure error

Branch boxes error
[Flexible Multi]

En-16