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INSTALLATION MANUAL

PART No. 9367702152

VRF system indoor unit (Ceiling type)

Contents

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

2. ABOUT THIS PRODUCT................................................................................................. 1

2.1. Precautions for using R410A refrigerant ............................................................... 1

2.2. Special tool for R410A .......................................................................................... 1

2.3. Accessories .......................................................................................................... 2

2.4. Optional parts ....................................................................................................... 2

3. INSTALLATION WORK ................................................................................................... 2

3.1. Selecting an installation location .......................................................................... 2

3.2. Installation dimension ........................................................................................... 3

3.3. Installing the unit ................................................................................................... 3

4. PIPE INSTALLATION ...................................................................................................... 4

4.1. Selecting the pipe material ................................................................................... 4

4.2. Pipe requirement .................................................................................................. 5

4.3. Flare connection (pipe connection) ...................................................................... 5

4.4. Installing heat insulation ....................................................................................... 6

5. INSTALLING DRAIN PIPES ............................................................................................ 6

6. ELECTRICAL WIRING .................................................................................................... 7

6.1. Electrical requirement ........................................................................................... 8

6.2. Wiring method ...................................................................................................... 8

6.3. Unit wiring ............................................................................................................. 8

6.4. Connection of wiring ............................................................................................. 9

6.5. Optional parts wiring ........................................................................................... 10

6.6. External input and external output (Optional parts) ............................................ 10

6.7. Drain pump unit (Optional parts) ........................................................................ 12

7. FIELD SETTING ............................................................................................................ 12

7.1. Setting the address ............................................................................................. 12

7.2. Custom code setting ........................................................................................... 12

7.3. Function setting .................................................................................................. 13

8. FRESH-AIR INTAKE ..................................................................................................... 14

9. FINISHING .................................................................................................................... 14

10. TEST RUN ................................................................................................................... 14

10.1. Test run using Outdoor unit (PCB) .................................................................... 14

10.2. Test run using remote controller ....................................................................... 14

11. CHECK LIST ................................................................................................................ 15

12. ERROR CODES .......................................................................................................... 15

1. SAFETY PRECAUTIONS

• Be sure to read this Manual thoroughly before installation.

• The warnings and precautions indicated in this Manual contain important information per-

taining 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.

This mark indicates procedures which, if improperly performed,

WARNING

might lead to the death or serious injury of the user.

Request your dealer or a professional installer to install the indoor unit in accordance

with this Installation Manual. An improperly installed unit can cause serious accidents

such as water leakage, electric shock, or ﬁ re. If the indoor unit is installed in disregard

of the instructions in the Installation 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 while work is being carried out, ventilate the area. If the refrigerant

comes in contact with a ﬂ ame, it produces a toxic gas.

Installation work must be performed in accordance with national wiring standards by

authorized personnel only.

Except for EMERGENCY, never turn oﬀ main as well as sub breaker of the indoor units

during operation. It will cause compressor failure as well as water leakage.

First, stop the indoor unit by operating the controller, converter or external input device

and then cut the breaker.

Make sure to operate through the controller, converter or external input device.

When the breaker is designed, locate it at a place where the users cannot start and

stop in the daily work.

En-1

This mark indicates procedures which, if improperly performed,

CAUTION

might possibly result in personal harm to the user, or damage

to property.

Read carefully all security information before use or install the air conditioner.

Do not attempt to install the air conditioner or a part of the air conditioner by yourself.

This unit must be installed by qualiﬁ ed personnel with a capacity certiﬁ cate for handling

refrigerant ﬂ uids. Refer to regulation and laws in use on installation place.

The installation must be carried out in compliance with regulations in force in the place

of installation and the installation instructions of the manufacturer.

This unit is part of a set constituting an air conditioner. It must not be installed alone or

with non-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 3mm for this unit.

The unit must be correctly grounded and the supply line must be equipped with a

diﬀ erential breaker in order to protect the persons.

The units are not explosion proof and therefore should not be installed in explosive

atmosphere.

Never touch electrical components immediately after the power supply has been

turned oﬀ . Electric shock may occur. After turning oﬀ the power, always wait 5 minutes

before touching electrical components.

This unit contains no user-serviceable parts. Always consult authorized service

personnel to repairs.

When moving, consult authorized service personnel for disconnection and installation

of the unit.

2. ABOUT THIS PRODUCT

2.1. Precautions for using R410A refrigerant

Do not introduce any substance other than the prescribed refrigerant into the

refrigeration cycle. If air enters the refrigeration cycle, the pressure in the refrigeration

cycle will become abnormally high and cause the piping to rupture.

If there is a refrigerant leak, make sure that it does not exceed the concentration limit.

If a refrigerant leak exceeds the concentration limit, it can lead to accidents such as

oxygen starvation.

Do not touch refrigerant that has leaked from the refrigerant pipe connections or other

area. Touching the refrigerant directly can cause frostbite.

If a refrigerant leak occurs during operation, immediately vacate the premises and

thoroughly ventilate the area. If the refrigerant comes in contact with a flame, it

produces a toxic gas.

2.2. Special tool for R410A

To install a unit that uses R410A refrigerant, use dedicated tools and piping materials that

have been manufactured speciﬁ cally for R410A use. Because the pressure of R410A

refrigerant is approximately 1.6 times higher than the R22, failure to use dedicated piping

material or improper installation can cause rupture or injury. Furthermore, it can cause

serious accidents such as water leakage, electric shock, or ﬁ re.

Tool name

The pressure in the refrigerant system is extremely high and

cannot be measured with a conventional gauge. To prevent

erroneous mixing of other refrigerants, the diameter of each

Gauge manifold

port has been changed. It is recommended to use a gauge

manifold with a high pressure display range of -0.1 to 5.3

MPa and a low pressure display range of -0.1 to 3.8 MPa.

To increase pressure resistance, the hose material and base

size were changed.

Charging hose

(The charging port thread diameter for R410A is 1/2 UNF 20

threads per inch.)

A conventional vacuum pump can be used by installing a

vacuum pump adapter.

Be sure that the pump oil does not backﬂ ow into the system.

Vacuum pump

Use one capable for vacuum suction of -100.7 kPa (5 Torr,

-755 mmHg).

Special gas leakage detector for R410A refrigerant.

Gas leakage detector

WARNING

Changes